FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27709-3E
ASSP For Power Supply Applications (Secondary battery)
DC/DC Converter IC for Charging Li-ion battery
MB3887
s DESCRIPTION
The MB3887 is a DC/DC converter IC suitable for down-conversion, using pulse-width (PWM) charging and enabling output voltage to be set to any desired level from one cell to four cells. These ICs can dynamically control the secondary battery's charge current by detecting a voltage drop in an AC adapter in order to keep its power constant (dynamically-controlled charging) . The charging method enables quick charging, for example, with the AC adapter during operation of a notebook PC. The MB3887 provides a broad power supply voltage range and low standby current as well as high efficiency, making it ideal for use as a built-in charging device in products such as notebook PC. This product is covered by US Patent Number 6,147,477.
s FEATURES
* Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-controlled charging)
(Continued)
s PACKAGE
24-pin plastic SSOP
(FPT-24P-M03)
MB3887
(Continued) * Output voltage setting using external resistor : 1 cell to 4 cells * High efficiency : 96% (VIN = 19 V, Vo = 16.8 V) * Wide range of operating supply voltages : 8 V to 25 V * Output voltage setting accuracy : 4.2 V 0.74% (Ta = -10 C to +85 C , per cell) * Charging current accuracy : 5% * Built-in frequency setting capacitor enables frequency setting using external resistor only * Oscillation frequency range : 100 kHz to 500 kHz * Built-in current detection amplifier with wide in-phase input voltage range : 0 V to VCC * In standby mode, leave output voltage setting resistor open to prevent inefficient current loss * Built-in standby current function : 0 A (standard) * Built-in soft-start function independent of loads * Built-in totem-pole output stage supporting P-channel MOS FET devices
2
MB3887
s PIN ASSIGNMENT
(TOP VIEW)
-INC2 : 1 OUTC2 : 2 +INE2 : 3 -INE2 : 4 FB2 : 5 VREF : 6 FB1 : 7 -INE1 : 8 +INE1 : 9 OUTC1 : 10 OUTD : 11 -INC1 : 12
24 : +INC2 23 : GND 22 : CS 21 : VCC (O) 20 : OUT 19 : VH 18 : VCC 17 : RT 16 : -INE3 15 : FB3 14 : CTL 13 : +INC1
(FPT-24P-M03)
3
MB3887
s PIN DESCRIPTION
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Symbol -INC2 OUTC2 +INE2 -INE2 FB2 VREF FB1 -INE1 +INE1 OUTC1 OUTD -INC1 +INC1 CTL FB3 -INE3 RT VCC VH OUT VCC (O) CS GND +INC2 I/O I O I I O O O I I O O I I I O I O O I Descriptions Current detection amplifier (Current Amp2) input terminal. Current detection amplifier (Current Amp2) output terminal. Error amplifier (Error Amp2) non-inverted input terminal. Error amplifier (Error Amp2) inverted input terminal. Error amplifier (Error Amp2) output terminal. Reference voltage output terminal. Error amplifier (Error Amp1) output terminal. Error amplifier (Error Amp1) inverted input terminal Error amplifier (Error Amp1) non-inverted input terminal. Current detection amplifier (Current Amp1) output terminal. With IC in standby mode, this terminal is set to "Hi-Z" to prevent loss of current through output voltage setting resistance. Set CTL terminal to "H" level to output "L" level. Current detection amplifier (Current Amp1) input terminal. Current detection amplifier (Current Amp1) input terminal. Power supply control terminal. Setting the CTL terminal at "L" level places the IC in the standby mode. Error amplifier (Error Amp3) output terminal. Error amplifier (Error Amp3) inverted input terminal. Triangular-wave oscillation frequency setting resistor connection terminal. Power supply terminal for reference power supply and control circuit. Power supply terminal for FET drive circuit (VH = VCC - 6 V) . External FET gate drive terminal. Output circuit power supply terminal. Soft-start capacitor connection terminal. Ground terminal. Current detection amplifier (Current Amp2) input terminal.
4
MB3887
s BLOCK DIAGRAM
-INE1 8 OUTC1 10 + x 20 - -INC1 12 +INC1 13 +INE1 9 FB1 7 -INE2 4 OUTC2 2 + +INC2 24 x 20 - -INC2 1 +INE2 3 FB2 5 VREF -INE3 16 OUTD 11
- + +
VREF - + + + + Drive - VREF - + Bias Voltage 2.5 V 1.5 V 19 VH (VCC - 6 V) 21 VCC (O)
20 OUT
VCC
VCC
(VCC UVLO) 215 k + - 35 k
4.2 V
0.91 V (0.77 V) VREF UVLO VCC 4.2 V 45 pF bias 17 RT [ VREF 5.0 V 6 VREF 23 GND 18 VCC 14 CTL]
FB3 15
VREF 10 A
CS 22
5
MB3887
s ABSOLUTE MAXIMUM RATINGS
Rating Min -55 Max 28 60 700 740* +125
Parameter Power supply voltage Output current Peak output current Power dissipation Storage temperature
Symbol VCC IOUT IOUT PD TSTG
Conditions VCC, VCC (O) terminal Duty 5 % (t = 1 / fOSC x Duty) Ta +25 C
Unit V mA mA mW C
* : The package is mounted on the dual-sided epoxy board (10 cm x 10 cm) . WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
6
MB3887
s RECOMMENDED OPERATING CONDITIONS
Value Min 8 -1 0 0 0 0 0 0 -45 -600 100 27 -30 Typ 290 47 0.022 0.1 0.1 +25 Max 25 0 30 VCC - 1.8 VCC 17 2 25 +45 +600 500 130 1.0 1.0 1.0 +85
Parameter Power supply voltage Reference voltage output current VH terminal output current
Symbol VCC IREF IVH VINE
Conditions VCC, VCC (O) terminal
Unit V mA mA V V V mA V mA mA kHz k F F F C
Input voltage VINC OUTD terminal output voltage OUTD terminal output current CTL terminal input voltage Output current Peak output current Oscillation frequency Timing resistor Soft-start capacitor VH terminal capacitor Reference voltage output capacitor Operating ambient temperature VOUTD IOUTD VCTL IOUT IOUT fOSC RT CS CVH CREF Ta
-INE1 to -INE3, +INE1, +INE2 terminal +INC1, +INC2, -INC1, -INC2 terminal Duty 5 % (t = 1 / fosc x Duty)
WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device's electrical characteristics are warranted when the device is operated within these ranges. Always use semiconductor devices within their recommended operating condition ranges. Operation outside these ranges may adversely affect reliability and could result in device failure. No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representatives beforehand.
7
MB3887
s ELECTRICAL CHARACTERISTICS
(Ta = +25 C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) Parameter Output voltage 1. Reference voltage block [REF] Input stability Load stability Short-circuit output current Symbol VREF1 VREF2 Line Load Ios VTLH Threshold voltage 2. Under voltage lockout protecHysteresis width tion circuit block Threshold voltage [UVLO] Hysteresis width 3. Soft-start block Charge current [SOFT] 4. Triangular waveform oscillator circuit block [OSC] Oscillation frequency Frequency temperature stability Input offset voltage Input bias current In-phase input voltage range VTHL VH VTLH VTHL VH ICS Pin No. 6 6 6 6 6 18 18 18 6 6 6 22 Conditions Ta = +25 C Ta = -10 C to +85 C VCC = 8 V to 25 V VREF = 0 mA to -1 mA VREF = 1 V VCC = VCC (O) , VCC = VCC = VCC (O) , VCC = VCC = VCC (O) VREF = VREF = RT = 47 k Value Min 4.967 4.95 -50 6.2 5.2 2.6 2.4 -14 260 Typ 5.000 5.00 3 1 -25 6.4 5.4 1.0* 2.8 2.6 0.2 -10 290 Max 5.041 5.05 10 10 -12 6.6 5.6 3.0 2.8 -6 320 Unit V V mV mV mA V V V V V V A kHz
fOSC
20
f/fdt
20
Ta = -30 C to +85 C
1*
%
VIO IB VCM AV BW VFBH VFBL
3, 4, FB1 = FB2 = 2 V 8, 9 3, 4, 8, 9 3, 4, 8, 9 5, 7 DC 5, 7 AV = 0 dB 5, 7 5, 7
-100 0 4.7 150
1 -30 100* 2* 4.9 20 -2 300
5 VCC - 1.8 200 -1
mV nA V dB MHz V mV mA A
5-1. Error amplifier Voltage gain block Frequency [Error Amp1, bandwidth Error Amp2]
Output voltage Output source current Output sink current * : Standard design value.
ISOURCE 5, 7 FB1 = FB2 = 2 V ISINK 5, 7 FB1 = FB2 = 2 V
(Continued)
8
MB3887
(Ta = +25 C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) Parameter Symbol VTH1 Threshold voltage Input current Voltage gain 5-2. Error amplifier Output voltage block [Error Amp3] Output source current Output sink current OUTD terminal output leak current OUTD terminal output ON resistor Frequency bandwidth VTH2 IINE3 AV BW VFBH VFBL ISOURCE ISINK ILEAK RON Pin No. 16 16 16 15 15 15 15 15 15 11 11 1, 12, 13, 24 13, 24 FB3 = 2 V FB3 = 2 V OUTD = 17 V OUTD = 1 mA +INC1 = +INC2 = -INC1 = -INC2 = 3 V to VCC +INC1 = +INC2 = 3 V to VCC, VIN = -100 mV Conditions FB3 = 2 V, Ta = +25 C FB3 = 2 V, Ta = -10 C to +85 C -INE3 = 0 V DC AV = 0 dB Value Min 4.183 4.169 -100 4.7 150 Typ 4.200 4.200 -30 100* 2* 4.9 20 -2 300 0 35 Max 4.225 4.231 200 -1 1 50 Unit V V nA dB MHz V mV mA A A
Input offset voltage 6. Current detection amplifier block [Current Amp1, Current Input current Amp2]
VIO
-3
+3
mV
I+INCH
20
30
A
I-INCH
+INC1 = +INC2 = 1, 12 3 V to VCC, Vin = -100 mV 13, 24 1, 12 +INC1 = +INC2 = 0 V, Vin = -100 mV +INC1 = +INC2 = 0 V, Vin = -100 mV
-180 -195
0.1 -120 -130
0.2
A A A
I+INCL I-INCL * : Standard design value
(Continued)
9
MB3887
(Ta = +25 C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) Parameter Symbol Pin No. Conditions Value Min 1.9 Typ 2.0 Max 2.1 Unit
+INC1 = +INC2 = VOUTC1 2, 10 3 V to VCC, Vin = -100 mV +INC1 = +INC2 = VOUTC2 2, 10 3 V to VCC, Vin = -20 mV +INC1 = +INC2 = VOUTC3 2, 10 0 V to 3 V, Vin = -100 mV +INC1 = +INC2 = VOUTC4 2, 10 0 V to 3 V, Vin = -20 mV VCM 1, 12, 13, 24
V
0.34
0.40
0.46
V
Current detection voltage
1.8
2.0
2.2
V
0.2
0.4
0.6
V
6. Current detection In-phase input amplifier block voltage range [Current Amp1, Current Amp2] Voltage gain Frequency bandwidth Output voltage Output source current Output sink current 7. PWM comparator block [PWM Comp.]
0
VCC
V
AV
+INC1 = +INC2 = 2, 10 3 V to VCC, Vin = -100 mV 2, 10 AV = 0 dB
19 4.7 150 1.4
20
21 200 -1 2.6
V/V
BW
2* 4.9 20 -2 300 1.5 2.5
MHz V mV mA A V V
VOUTCH 2, 10 VOUTCL 2, 10
ISOURCE 2, 10 OUTC1 = OUTC2 = 2 V ISINK VTL 2, 10 OUTC1 = OUTC2 = 2 V 5, 7, Duty cycle = 0 % 15 5, 7, Duty cycle = 100 % 15
Threshold voltage VTH
* : Standard design value
(Continued)
10
MB3887
(Continued)
Symbol ISOURCE ISINK ROH ROL tr1 tf1 VON VOFF ICTLH ICTLL Pin No. 20 20 20 20 20 20 14 14 14 14 (Ta = +25 C, VCC = 19 V, VCC (O) = 19 V, VREF = 0 mA) Parameter Output source current Output sink current 8. Output block [OUT] Output ON resistor Rise time Fall time CTL input voltage Input current Conditions OUT = 13 V, Duty 5 % (t = 1 / fOSC x Duty) OUT = 19 V, Duty 5 % (t = 1 / fOSC x Duty) OUT = -45 mA OUT = 45 mA OUT = 3300 pF (Si4435 x 1) OUT = 3300 pF (Si4435 x 1) IC Active mode IC Standby mode CTL = 5 V CTL = 0 V VCC = VCC (O) = 8 V to 25 V, VH = 0 to 30 mA VCC = VCC (O) , CTL = 0 V VCC = VCC (O) , CTL = 5 V Value Min 2 0 Typ -400* 400* 6.5 5.0 50* 50* 100 0 Max 9.8 7.5 25 0.8 150 1 Unit mA mA ns ns V V A A V
9. Control block [CTL] 10. Bias voltage block [VH] 11. General
Output voltage
VH
19
VCC - 6.5 VCC - 6.0 VCC - 5.5
Standby current Power supply current
ICCS ICC
18 18
0 8
10 12
A mA
* : Standard design value
11
MB3887
s TYPICAL CHARACTERISTICS
Power supply current vs. Power supply voltage Power supply current ICC (mA)
6 5 4 3 2 1 0 Ta = +25 C CTL = 5 V
Reference voltage vs. Power supply voltage
6
Reference voltage VREF (V)
5 4 3 2 1 0
Ta = +25 C CTL = 5 V VREF = 0 mA 0 5 10 15 20 25
0
5
10
15
20
25
Power supply voltage VCC (V) Reference voltage vs. IREF load current
6
Power supply voltage VCC (V) Reference voltage vs. Ambient temperature
5.08
Reference voltage VREF (V)
Reference voltage VREF (V)
5 4 3 2 1 0 0 5 10 15 20
Ta = +25 C VCC = 19 V CTL = 5 V
5.06 5.04 5.02 5.00 4.98 4.96 4.94 4.92 -40 -20
VCC = 19 V CTL = 5 V
25
30
0
20
40
60
80
100
IREF load current IREF (mA) CTL terminal current, Reference voltage vs. CTL terminal voltage CTL terminal current ICTL (A)
1000 900 800 700 600 500 400 300 200 100 0 0 5 10 15 20 25 ICTL VREF 9 8 7 6 5 4 3 2 1 0
Ambient temperature Ta ( C)
CTL terminal voltage VCTL (V)
Reference voltage VREF (V)
Ta = +25 C VCC = 19 V
10
(Continued)
12
MB3887
Triangular wave oscillation frequency vs. Timing resistor
1M
Triangular wave oscillation frequency vs. Power supply voltage
340 Ta = +25 C CTL = 5 V RT = 47 k
Triangular wave oscillation frequency fOSC (Hz)
Triangular wave oscillation frequency fOSC (kHz)
Ta = +25 C VCC = 19 V CTL = 5 V
330 320 310 300 290 280 270 260 0 5 10 15
100 k
10 k 10 100 1000
20
25
Timing resistor RT (k)
Power supply voltage VCC (V)
Triangular wave oscillation frequency vs. Ambient temperature
320 315 310 305 300 295 290 285 280 275 270 265 260 -40 VCC = 19 V CTL = 5 V RT = 47 k 4.25 2.24
Error amplifier threshold voltage vs. Ambient temperature
VCC = 19 V CTL = 5 V
Triangular wave oscillation frequency fOSC (kHz)
Error amplifier threshold voltage VTH (V)
4.23 2.22 4.21 4.20 4.19 4.18 4.17 4.16 4.15 -40 -20 0 20 40
-20
0
20
40
60
80
100
60
80
100
Ambient temperature Ta ( C)
Ambient temperature Ta ( C)
(Continued)
13
MB3887
Error amplifier gain and phase vs. Frequency
40 AV Ta = +25 C 180 4.2 V VCC = 19 V 240 k 10 k 8 (4) 9 (3) 10 k -40 1k 10 k 100 k 1M -180 10 M 10 k - + 7 (5) Error Amp1 (Error Amp2) OUT
Phase (deg)
20
90
Gain AV (dB)
10 k 1 F IN
+
0
0
2.4 k
-20
-90
Frequency f (Hz) Error amplifier gain and phase vs. Frequency
40 AV Ta = +25 C 180 10 k 4.2 V 10 k VCC = 19 V
240 k
Phase (deg)
Gain AV (dB)
20
90
1 F IN
+
16 2.4 k 22
0
0
- + + 15 OUT
-20 -40 1k 10 k 100 k 1M
-90
10 k -180 10 M
10 k
Error Amp3 4.2 V
Frequency f (Hz) Current detection amplifier gain and phase vs. Frequency
Ta = +25 C 40 AV 180 VCC = 19 V 13 + (24) x20 10 (2) 12 - (1) Current Amp1 (Current Amp2) 12.6 V 12.55 V
Phase (deg)
Gain AV (dB)
20
90
OUT
0
0
-20 -40 1k 10 k 100 k 1M
-90
-180 10 M
Frequency f (Hz)
(Continued)
14
MB3887
(Continued)
Power dissipation vs. Ambient temperature Power dissipation PD (mW)
800 740 700 600 500 400 300 200 100 0 -40 -20 0 20 40 60 80 100
Ambient temperature Ta ( C)
15
MB3887
s FUNCTIONAL DESCRIPTION
1. DC/DC Converter Unit
(1) Reference voltage block (Ref) The reference voltage generator uses the voltage supplied from the VCC terminal (pin 18) to generate a temperature-compensated, stable voltage (5.0 V Typ) used as the reference supply voltage for the IC's internal circuitry. This terminal can also be used to obtain a load current to a maximum of 1mA from the reference voltage VREF terminal (pin 6) . (2) Triangular wave oscillator block (OSC) The triangular wave oscillator builds the capacitor for frequency setting into, and generates the triangular wave oscillation waveform by connecting the frequency setting resistor with the RT terminal (pin 17) . The triangular wave is input to the PWM comparator on the IC. (3) Error amplifier block (Error Amp1) This amplifier detects the output signal from the current detection amplifier (Current amp1) , compares this to the +INE1 terminal (pin 9) , and outputs a PWM control signal to be used in controlling the charging current. In addition, an arbitrary loop gain can be set up by connecting a feedback resistor and capacitor between the FB1 terminal (pin 7) and -INE1 terminal (pin 8) , providing stable phase compensation to the system. (4) Error amplifier block (Error Amp2) This amplifier (Error Amp2) detects voltage drop of the AC adapter and outputs a PWM control signal. In addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the FB2 terminal (pin 5) to the -INE2 terminal (pin 4) of the error amplifier, enabling stable phase compensation to the system. (5) Error amplifier block (Error Amp3) This error amplifier (Error Amp3) detects the output voltage from the DC/DC converter and outputs the PWM control signal. External output voltage setting resistors can be connected to the error amplifier inverted input terminal to set the desired level of output voltage from 1 cell to 4 cells. In addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the FB3 terminal (pin 15) to the -INE3 terminal (pin 16) of the error amplifier, enabling stable phase compensation to the system. Connecting a soft-start capacitor to the CS terminal (pin 22) prevents rush currents when the IC is turned on. Using an error amplifier for soft-start detection makes the soft-start time constant, independent of the output load. (6) Current detection amplifier block (Current Amp1) The current detection amplifier (Current Amp1) detects a voltage drop which occurs between both ends of the output sense resistor (RS) due to the flow of the charge current, using the +INC1 terminal (pin 13) and -INC1 terminal (pin 12) . Then it outputs the signal amplified by 20 times to the error amplifier (Error Amp1) at the next stage.
16
MB3887
(7) PWM comparator block (PWM Comp.) The PWM comparator circuit is a voltage-pulse width converter for controlling the output duty of the error amplifiers (Error Amp1 to Error Amp3) depending on their output voltage. The PWM comparator circuit compares the triangular wave generated by the triangular wave oscillator to the error amplifier output voltage and turns on the external output transistor during the interval in which the triangular wave voltage is lower than the error amplifier output voltage. (8) Output block (OUT) The output circuit uses a totem-pole configuration capable of driving an external P-channel MOS FET. The output "L" level sets the output amplitude to 6 V (Typ) using the voltage generated by the bias voltage block (VH) . This results in increasing conversion efficiency and suppressing the withstand voltage of the connected external transistor in a wide range of input voltages. (9) Control block (CTL) Setting the CTL terminal (pin 14) low places the IC in the standby mode. (The supply current is 10 A at maximum in the standby mode.) CTL function table CTL L H (10) Bias voltage block (VH) The bias voltage circuit outputs VCC -6 V (Typ) as the minimum potential of the output circuit. In the standby mode, this circuit outputs the potential equal to VCC.
Power OFF (Standby) ON (Active)
OUTD Hi-Z L
2. Protection Functions
Under voltage lockout protection circuit (UVLO) The transient state or a momentary decrease in supply voltage or internal reference voltage (VREF) , which occurs when the power supply (VCC) is turned on, may cause malfunctions in the control IC, resulting in breakdown or degradation of the system. To prevent such malfunction, the under voltage lockout protection circuit detects a supply voltage or internal reference voltage drop and fixes the OUT terminal (pin 20) to the "H" level. The system restores voltage supply when the supply voltage or internal reference voltage reaches the threshold voltage of the under voltage lockout protection circuit. Protection circuit (UVLO) operation function table When UVLO is operating (VCC or VREF voltage is lower than UVLO threshold voltage.) OUTD OUT CS Hi-Z H L
17
MB3887
3. Soft-Start Function
Soft-start block (SOFT) Connecting a capacitor to the CS terminal (pin 22) prevents rush currents when the IC is turned on. Using an error amplifier for soft-start detection makes the soft-start time constant, being independent of the output load of the DC/DC converter.
s SETTING THE CHARGING VOLTAGE
The charging voltage (DC/DC output voltage) can be set by connecting external voltage setting resistors (R3, R4) to the -INE3 terminal (pin 16) . Be sure to select a resistor value that allows you to ignore the on-resistor (35 , 1mA) of the internal FET connected to the OUTD terminal (pin 11) . In standby mode, the charging voltage is applied to OUTD termial. Therefore, output voltage must be adjusted so that voltage applied to OUTD terminal is 17 V or less. Battery charging voltage : VO VO (V) = (R3 + R4) / R4 x 4.2 (V)
B VO
R3 -INE3 16
- + +
R4 11 OUTD
4.2 V
22 CS
s METHOD OF SETTING THE CHARGING CURRENT
The charge current (output limit current) value can be set with the voltage at the +INE1 terminal (pin 9) . If a current exceeding the set value attempts to flow, the charge voltage drops according to the set current value. Battery charge current setting voltage : +INE1 +INE1 (V) = 20 x I1 (A) x RS ()
s METHOD OF SETTING THE TRIANGULAR WAVE OSCILLATION FREQUENCY
The triangular wave oscillation frequency can be set by the timing resistor (RT) connected the RT terminal (pin 17) . Triangular wave oscillation frequency : fOSC fOSC (kHz) = 13630 / RT (k) : 18
MB3887
s METHOD OF SETTING THE SOFT-START TIME
For preventing rush current upon activation of IC, the IC allows soft-start using the capacitor (Cs) connected to the CS terminal (pin 22) . When CTL terminal (pin 14) is placed under "H" level and IC is activated (VCC UVLO threshold voltage) , Q2 is turned off and the external soft-start capacitor (Cs) connected to the CS terminal is charged at 10 A. Error Amp output (FB3 terminal (pin 15) ) is determined by comparison between the lower voltage of the two non-reverse input terminals (4.2 V and CS terminal voltage) and reverse input terminal voltage (-INE3 terminal (pin 16) voltage) . Within the soft-start period (CS terminal voltage < 4.2 V) , FB3 is determined by comparison between -INE3 terminal voltage and CS terminal voltage, and DC/DC converter output voltage goes up proportionately with the increase of CS terminal voltage caused by charging on the soft-start capacitor.Soft-start time is found by the following formula : Soft-start time : ts (time to output 100 %) tS (s) = 0.42 x CS (F) :
= 4.9 V = 4.2 V
CS terminal voltage Comparison with Error Amp block - INE3 voltage.
=0V
Soft-start time: ts
VREF
10 A
10 A
FB3
15 - + + 4.2 V Error Amp3
-INE3 16 CS 22
CS
Q2
UVLO
Soft-start circuit
19
MB3887
s AC ADAPTOR VOLTAGE DETECTION
* With an external resistor connected to the +INE2 terminal (pin 3) , the IC enters the dynamically-controlled charging mode to reduce the charge current to keep AC adapter power constant when the partial potential point A of the AC adapter voltage (VCC) becomes lower than the voltage at the -INE2 terminal. AC adapter detection voltage setting : Vth Vth (V) = (R1 + R2) / R2 x -INE2
-INE2 4 VCC R1 R2 A +INE2 3
- +
s OPERATION TIMING DIAGRAM
Error Amp2 FB2 Error Amp1 FB1
2.5 V
Error Amp2 FB3 1.5 V
OUT
Constant voltage control
Constant current control
AC adapter dynamicallycontrolled charging
20
MB3887
s PROCESSING WITHOUT USING THE CURRENT AMP
When Current Amp is not used, connect the +INC1 terminal (pin 13) , +INC2 terminal (pin 24) , -INC1 terminal (pin 12) , and -INC2 terminal (pin 1) to VREF, and then leave OUTC1 terminal (pin 10) and OUTC2 terminal (pin 2) open.
12 1
-INC1 -INC2
+INC1 13 +INC2 24
"Open"
10 2
OUTC1 OUTC2
6
VREF
Connection when Current Amp is not used
21
MB3887
s PROCESSING WITHOUT USING OF THE ERROR AMP
When Error Amp is not used, leave FB1 terminal (pin 7) , FB2 terminal (pin 5) open and connect the -INE1 terminal (pin 8) and -INE2 terminal (pin 4) to GND and connect +INE1 terminal (pin 9) , and +INE2 terminal (pin 3) , to VREF.
9 3 8 4
+INE1 +INE2 -INE1 -INE2 FB1 FB2 VREF
GND
23
"Open"
7 5 6
Connection when Error Amp is not used
22
MB3887
s PROCESSING WITHOUT USING OF THE CS TERMINAL
When soft-start function is not used, leave the CS terminal (pin 22) open.
"Open"
CS 22
Connection when soft-start time is not specified
s NOTE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE
* Insert a reverse-current preventive diode at one of the three locations marked * to prevent reverse current from the battery. * When selecting the reverse current prevention diode, be sure to consider the reverse voltage (VR) and reverse current (IR) of the diode.
21
VCC(O)
VIN
A 20 OUT B
I1 RS
BATT
VH 19 Battery
23
24
MB3887
VREF - + + C1 22 F A Q1 L1 22 H VH 19 (VCC - 6 V) D1 C2 100 F + + I1 R1 0.033 Battery C3 100 F B IIN AC Adaptor VCC (O) 21 C5 0.1 F OUT
VIN = 13.93 V to 25 V (at 3 cell) VIN = 17.65 V to 25 V (at 4 cell)
R14 1 k
R16 R15 200 k 120 -INE2 4 20 + + + Drive -
s APPLICATION EXAMPLE
Q2
R8 100 k -INE1 8 OUTC1 10 C10 5600 pF +INC1 A + 13 R9 x 20 -INC1 10 k - B 12 R12 30 k +INE1 9 R13 20 k FB1 7
SW VREF VCC - + Bias Voltage 2.5 V 1.5 V (VCC UVLO) 215 k + - 35 k 0.91 V (0.77 V) VREF UVLO VCC 4.2 V 45 pF bias 17 RT R2 47 k 6 VREF [ VREF 5.0 V 23 GND C9 0.1 F 18 VCC 14 CTL OUTC2 2 +INC2 + 24 x 20 - 1 -INC2 3 +INE2 FB2 5 VREF 16]
- + +
C8 10000 pF R7 R4 22 k 82 k
VO
R10 30 k VCC
R5 330 k R6 68 k
R11 30 k -INE3
R19 100 k R18 200 k
Output voltage (Battery voltage) is adjustable
C6 1500 pF 11 OUTD 4.2 V FB3 15 VREF 10 A
R3 330 k
R17 100 k
Note: Set output voltage so that voltage applied to OUTD terminal is 17 V or less.
CS 22
C4 0.022 F
C7 0.1 F
MB3887
s PARTS LIST
COMPONENT Q1 Q2 D1 L1 C1 C2, C3 C4 C5 C6 C7 C8 C9 C10 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 to R12 R13 R14 R15 R16, R18 R17, R19 ITEM P-ch FET N-ch FET Diode Inductor OS-CONTM Electrolytic Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Ceramics Condenser Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor SPECIFICATION VENDOR PARTS No. Si4435DY 2N7002E RB053L-30 SLF12565T220M3R5 25SL22M 25CV100AX C1608JB1H223K CM21W5R104K16 GRM39B152K10 GRM39F104KZ25 GRM39B103K10 CM21W5R104K16 GRM39B562K10 RK73Z1J-0D RK73G1J-473D RK73G1J-334D RK73G1J-823D RK73G1J-334D RK73G1J-683D RK73G1J-223D RK73G1J-104D CR21-103-F RK73G1J-303D RK73G1J-203D RK73G1J-102D RR0816P121D RK73G1J-204D RK73G1J-104D VDS = -30 V, ID = 8 A (Max) VISHAY SILICONIX VDS = 60 V, ID = 0.115 A VISHAY SILICONIX (Max) VF = 0.42 V (Max) , IF = 3 A 22 H 22 F 100 F 0.022 F 0.1 F 1500 pF 0.1 F 10000 pF 0.1 F 5600 pF 0.033 47 k 330 k 82 k 330 k 68 k 22 k 100 k 10 k 30 k 20 k 1 k 120 200 k 100 k 3.5 A, 31.6 m 25 V (10 %) 25 V (10 %) 50 V 16 V 10 V 25 V 10 V 16 V 10 V 1.0 % 0.5 % 0.5 % 0.5 % 0.5 % 0.5 % 0.5 % 0.5 % 1.0 % 0.5 % 0.5 % 0.5 % 0.5 % 0.5 % 0.5 % ROHM TDK SANYO SANYO TDK KYOCERA MURATA MURATA MURATA KYOCERA MURATA SEIDEN TECHNO KOA KOA KOA KOA KOA KOA KOA KYOCERA KOA KOA KOA ssm KOA KOA
Note : VISHAY SILICONIX : VISHAY Intertechnology, Inc. ROHM : ROHM CO., LTD. TDK : TDK Corporation SANYO : SANYO Electric Co., Ltd. KYOCERA : Kyocera Corporation MURATA : Murata Manufacturing Co., Ltd. SEIDEN TECHNO : SEIDEN TECHNO CO., LTD. KOA : KOA Corporation ssm : SUSUMU Co., Ltd. OS-CON is a trademark of SANYO Electric Co., Ltd.
25
MB3887
s REFERENCE DATA
Conversion efficiency vs. Charge current (Constant voltage mode)
100
Conversion efficiency vs. Charge current (Constant current mode)
100
Conversion efficiency (%)
1 10
Conversion efficiency (%)
98 96 94 92 90 88 86 84 82
Ta = +25 C VIN = 19 V BATT charge voltage = set at 12.6 V SW = ON Efficiency (%) = (VBATT x IBATT) / (VIN x IIN) x 100
98 96 94 92 90 88 86 84 82 80 0
Ta = +25 C VIN = 19 V BATT charge voltage = set at 12.6 V SW = ON Efficiency (%) = (VBATT x IBATT) / (VIN x IIN) x 100
80 10 m
100 m
2
4
6
8
10
12
14
16
BATT charge current IBATT (A)
BATT charge voltage VBATT (V)
Conversion efficiency vs. Charge current (Constant voltage mode)
100 100
Conversion efficiency vs. Charge current (Constant current mode) Conversion efficiency (%)
98 96 94 92 90 88 86 84 82 80 10 0 2 4 6 8 10 Ta = +25 C VIN = 19 V BATT charge voltage = set at 16.8 V SW = ON Efficiency (%) = (VBATT x IBATT) / (VIN x IIN) x 100 12 14 16 18 20
Conversion efficiency (%)
98 96 94 92 90 88 86 84 82 80 10 m 100 m Ta = +25 C VIN = 19 V BATT charge voltage = set at 16.8 V SW = ON Efficiency (%) = (VBATT x IBATT) / (VIN x IIN) x 100 1
BATT charge current IBATT (A)
BATT charge voltage VBATT (V)
(Continued)
26
MB3887
Conversion efficiency vs. Charge current (Constant voltage mode)
100 100
Conversion efficiency vs. Charge current (Constant current mode) Conversion efficiency (%)
98 96 94 92 90 88 86 84 82 80 0 2 4 6 8 10 Ta = +25 C VIN = 19 V BATT charge voltage = set at 16.8 V SW = ON Efficiency (%) = (VBATT x IBATT) / (VIN x IIN) x 100 12 14 16 18 20
Conversion efficiency (%)
98 96 94 92 90 88 86 84 82 80 10 m 100 m Ta = +25 C VIN = 19 V BATT charge voltage = set at 16.8 V SW = ON Efficiency (%) = (VBATT x IBATT) / (VIN x IIN) x 100 1 10
BATT charge current IBATT (A)
BATT charge voltage VBATT (V)
BATT voltage vs. BATT charge current (set at 12.6 V)
18 16 Ta = +25 C VIN = 19 V BATT : Electronic load, (Product of KIKUSUI PLZ-150W) 20 18
BATT voltage vs. BATT charge current (set at 16.8 V)
BATT : Electronic load, (Product of KIKUSUI PLZ-150W) Ta = +25 C VIN = 19 V Dead Battery MODE DCC MODE
BATT voltage VBATT (V)
BATT voltage VBATT (V)
14 12 10 8 6 4 2 0 0 0.5 1 1.5
16 14 12 10 8 6 4 2 0 0 0.5 1 1.5
Dead Battery MODE
DCC MODE
DCC : Dynamically-Controlled 2 2.5 3 3.5 4 4.5 5
DCC : Dynamically-Controlled 2 2.5 3 3.5 4 4.5 5
BATT charge current IBATT (A)
BATT charge current IBATT (A)
(Continued)
27
MB3887
Switching waveform constant voltage mode (set at 12.6 V)
VBATT (mV) 100 0 -100 VD (V) 15 10 5 0 VD
Ta = +25 C VIN = 19 V BATT = 1.5 A
Switching waveform constant current mode (set at 12.6 V, with 10 V)
VBATT (mV) Ta = +25 C VIN = 19 V 100 BATT = 3.0 A 0 -100 VD (V) 15 10 5 0 VD 98 mVp-p
98 mVp-p VBATT
VBATT
0
1
2
3
4
5
6
7
8
9
10 (s)
0
1
2
3
4
5
6
7
8
9
10 (s)
Switching waveform constant voltage mode (set at 16.8 V)
+25 VBATT (mV) Ta = = 19 C VIN V 100 BATT = 1.5 A
Switching waveform constant current mode (set at 16.8 V, with 10 V)
VBATT (mV) 100 0
Ta = +25 C VIN = 19 V BATT = 3.0 A
58 mVp-p VBATT VD
96 mVp-p
VBATT VD
0 -100 VD (V) 15 10 5 0
-100 VD (V) 15 10 5 0
0
1
2
3
4
5
6
7
8
9
10 (s)
0
1
2
3
4
5
6
7
8
9
10 (s)
(Continued)
28
MB3887
(Continued)
Soft-start operating waveform constant voltage mode (set at 12.6 V)
VBATT (V) 20 10 0 VCS (V) 4 2 0 VCTL (V) 5 0 0 2 4 6 8 10 12 14 16 18 20 (ms) VCTL Ta = +25 C, VIN = 19 V BATT = 12 ts = 10.4 ms VBATT 10 VBATT VCS 0 VCS (V) 4 2 VCS 0 VCTL (V) 5 0 0 2 4 6 8 10 12 14 16 18 20 (ms) VCTL Ta = +25 C VIN = 19 V BATT = 12
Discharge operating waveform constant voltage mode (set at 12.6 V)
VBATT (V) 20
Soft-start operating waveform constant voltage mode (set at 16.8 V)
VBATT (V) 20 10 0 VCS (V) 4 2 0 VCTL (V) 5 0 0 2 4 6 8 10 12 14 16 18 20 (ms) VCTL Ta = +25 C, VIN = 19 V BATT = 12 ts = 10.4 ms VCS VBATT
Discharge operating waveform constant voltage mode (set at 16.8 V)
VBATT (V) 20 10 VBATT 0 VCS (V) 4 2 VCS 0 VCTL (V) 5 0 0 2 4 6 8 10 12 14 16 18 20 (ms) VCTL Ta = +25 C VIN = 19 V BATT = 12
29
MB3887
s USAGE PRECAUTIONS
* Printed circuit board ground lines should be set up with consideration for common impedance. * Take appropriate static electricity measures. * Containers for semiconductor materials should have anti-static protection or be made of conductive material. * After mounting, printed circuit boards should be stored and shipped in conductive bags or containers. * Work platforms, tools, and instruments should be properly grounded. * Working personnel should be grounded with resistance of 250 k to 1 M between body and ground. * Do not apply negative voltages. * The use of negative voltages below -0.3 V may create parasitic transistors on LSI lines, which can cause malfunction.
s ORDERING INFORMATION
Part number MB3887PFV Package 24-pin plastic SSOP (FPT-24P-M03) Remarks
30
MB3887
s PACKAGE DIMENSION
24-pin plastic SSOP (FPT-24P-M03)
* 7.750.10(.305.004)
24 13
Note1: Pins width and pins thickness include plating thickness. Note2: * This dimension does not include resin protrusion.
0.170.03 (.007.001)
5.600.10 7.600.20 (.220.004) (.299.008) INDEX Details of "A" part 1.25 -0.10 .049 -.004
+0.20 +.008
(Mounting height)
0.25(.010) 0~8
1
12
"A"
M
0.65(.026)
0.24 .009
+0.08 -0.07 +.003 -.003
0.13(.005)
0.500.20 (.020.008) 0.600.15 (.024.006)
0.100.10 (.004.004) (Stand off)
0.10(.004)
C
2001 FUJITSU LIMITED F24018S-c-3-4
Dimensions in mm (inches) .
31
MB3887
FUJITSU LIMITED
All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. The information and circuit diagrams in this document are presented as examples of semiconductor device applications, and are not intended to be incorporated in devices for actual use. Also, FUJITSU is unable to assume responsibility for infringement of any patent rights or other rights of third parties arising from the use of this information or circuit diagrams. The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for use requiring extremely high reliability (i.e., submersible repeater and artificial satellite). Please note that Fujitsu will not be liable against you and/or any third party for any claims or damages arising in connection with above-mentioned uses of the products. Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. If any products described in this document represent goods or technologies subject to certain restrictions on export under the Foreign Exchange and Foreign Trade Law of Japan, the prior authorization by Japanese government will be required for export of those products from Japan.
F0211 (c) FUJITSU LIMITED Printed in Japan
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