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MIC2920A/29201/29202/29204
Micrel
MIC2920A/29201/29202/29204
400mA Low-Dropout Voltage Regulator
General Description
The MIC2920A family are "bulletproof," efficient voltage regulators with very low dropout voltage (typically 40mV at light loads and 370mV at 250mA), and very low quiescent current (140A typical). The quiescent current of the MIC2920A increases only slightly in dropout, prolonging battery life. Key MIC2920A features include protection against reversed battery, fold-back current limiting, and automotive "load dump" protection (60V positive transient). The MIC2920 is available in several configurations. The MIC2920A-x.x devices are three pin fixed voltage regulators available in 3.3V, 4.85V, 5V, and 12V outputs. The MIC29201 is a fixed regulator offering a logic compatible ON/OFF (shutdown) input and an error flag output. This flag may also be used as a power-on reset signal. A logic-compatible shutdown input is provided on the adjustable MIC29202 which allows the regulator to be switched on and off. The MIC29204 8-pin SOIC adjustable regulator includes both shutdown and error flag pins and may be pin-strapped for 5V output or programmed from 1.24V to 26V using two external resistors.
Features
* * * * * * * * * * * * High output voltage accuracy Guaranteed 400mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Input withstands -20V reverse battery and 60V positive transients Error flag warns of output dropout Logic-controlled electronic shutdown Output programmable from 1.24V to 26V (MIC29202/MIC29204) Available in TO-220, TO-220-5, and surface-mount TO-263-5, SOT-223, and SO-8 packages. Battery-powered equipment Cellular telephones Laptop, notebook, and palmtop computers PCMCIA VCC and VPP regulation/switching Bar code scanners Automotive electronics SMPS post-regulators Voltage reference High-efficiency linear power supplies
3
Applications
* * * * * * * * *
Pin Configuration
TAB
OUTPUT 1 SENSE 2 SHUTDOWN 3 GROUND 4
8 7 6 5
INPUT NC NC ERROR
1 2 3
MIC29201-3.3BM (SO-8)
OUTPUT 1 SENSE 2 SHUTDOWN 3 GROUND 4 8 7 6 5 INPUT ADJUST 5V TAP ERROR
INPUT OUTPUT GROUND
MIC2920A-x.xBS (SOT-223)
MIC29204BM (SO-8)
5-Lead Package Pinouts MIC29201 MIC29202 1) Error Adjust 2) Input Shutdown 3) Ground Ground 4) Output Input 5) Shutdown Output
1 2 3
12345
INPUT OUTPUT GROUND
12345
MIC29201/29202BU (TO-263-5)
MIC2920A-xxBT (TO-220)
MIC29201/29202BT (TO-220-5)
Tab is Ground on SOT-223, TO-220, and TO-263 packages. January 1998 3-9
MIC2920A/29201/29202/29204
Micrel
Ordering Information
Part Number MIC2920A-3.3BS MIC2920A-3.3BT MIC2920A-4.8BS MIC2920A-4.8BT MIC2920A-5.0BS MIC2920A-5.0BT MIC2920A-12BS MIC2920A-12BT MIC29201-3.3BM MIC29201-3.3BT MIC29201-3.3BU MIC29201-4.8BT MIC29201-4.8BU MIC29201-5.0BT MIC29201-5.0BU MIC29201-12BT MIC29201-12BU MIC29202BT MIC29202BU MIC29204BM MIC29204BN Voltage 3.3V 3.3V 4.85V 4.85V 5.0V 5.0V 12V 12V 3.3V 3.3V 3.3V 4.85V 4.85V 5.0V 5.0V 12V 12V Adj Adj 5V and Adj 5V and Adj Temperature Range* -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package SOT-223 TO-220 SOT-223 TO-220 SOT-223 TO-220 SOT-223 TO-220 SO-8 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 TO-220-5 TO-263-5 SO-8 8-pin PDIP
Absolute Maximum Ratings
If Military/Aerospace specified devices are required, contact your local Micrel representative/distributor for availability and specifications.
Power Dissipation ................ Internally Limited, Note 1 Lead Temperature (Soldering, 5 seconds) ........ 260C Storage Temperature Range ............ -65C to +150C Operating Junction Temperature Range ................................................. -40C to +125C Thermal Characteristics: SOT-223 JC .................................................... 15C/W TO-220 JC ......................................................... 3C/W TO-263 JC ......................................................... 3C/W 8-Pin SOIC JA ................................................... Note 1 Input Supply Voltage ............................... -20V to +60V Operating Input Supply Voltage ................... 2V to 26V Adjust Input Voltage (Notes 9 and 10) ...................................................... -1.5V to +26V Shutdown Input Voltage ......................... -0.3V to +30V Error Comparator Output Voltage .......... -0.3V to +30V
Across the full operating temperature, the minimum input voltage range for full output current is 4.3V to 26V. Output will remain in-regulation at lower output voltages and low current loads down to an input of 2V at 25C.
* Junction temperatures
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January 1998
MIC2920A/29201/29202/29204
Micrel
Electrical Characteristics
Limits in standard typeface are for TJ = 25C and limits in boldface apply over the full operating temperature range. Unless otherwise specified, VIN = VOUT + 1V, IL = 1mA, CL = 10F. Adjustable version are set for an output of 5V. The MIC29202 VSHUTDOWN 0.7V. The eight pin MIC29204 is configured with the Adjust pin tied to the 5V Tap, the Output is tied to Output Sense (VOUT = 5V), and VSHUTDOWN 0.7V. Symbol VO Parameter Output Voltage Accuracy Conditions Variation from factory trimmed VOUT 1mA IL 400mA, across temp. range MIC2920A-12 and 29201-12 only 1mA IL 400mA, across temp. range (Note 2) VOUT > 10V only VIN = VOUT + 1V to 26V IL = 1 to 250mA (Note 3) Min -1 -2 -2.5 -1.5 -3 -4 Typical Max 1 2 2.5 1.5 3 4 100 350 0.10 0.40 0.16 0.30 150 180 Units %
VO T VO VO VO VO VIN - VO
Output Voltage Temperature Coef. Line Regulation Load Regulation
20 80 0.03 0.04
ppm/C % %
3
mV
Dropout Voltage (Note 4)
IL = 1mA IL = 100mA VOUT > 10V only IL = 250mA VOUT > 10V only IL = 400mA
100 250 350 370 500 450
600 750 200 300 2 2.5 9 12 15 400 A mA
IGND
Ground Pin Current (Note 5)
IL = 1mA IL = 100mA IL = 250mA IL = 400mA
140 1.3 5 13 180
IGNDDO
Ground Pin Current at Dropout (Note 5) Current Limit
VIN = 0.5V less than designed VOUT (VOUT 3.3V) IO = 1mA VOUT = 0V (Note 6)
A
ILIMIT
425
1000 1200 0.2
mA
VO PD en
Thermal Regulation (Note 7)
0.05
%/W
Output Noise Voltage (10Hz to 100kHz) IL = 100mA
CL = 10F CL = 100F
400 260
V RMS
January 1998
3-11
MIC2920A/29201/29202/29204
Micrel
Electrical Characteristics (Continued)
MIC29202, MIC29204
Parameter Reference Voltage Conditions MIC29202 Min 1.223 1.210 1.204 1.210 1.200 1.185 20 1.235 Typ 1.235 Max 1.247 1.260 1.266 1.260 1.270 1.285 40 60 Units V
Reference Voltage Reference Voltage
MIC29202 (Note 8) MIC29204
V V
Reference Voltage Adjust Pin Bias Current Reference Voltage Temperature Coefficient Adjust Pin Bias Current Temperature Coefficient Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input Logic Voltage
MIC29204 (Note 8)
V nA
(Note 7)
20
ppm/C
0.1
nA/C
MIC29201, MIC29204 VOH = 26V VIN = 4.5V IOL = 250A (Note 9) 40 25 0.01 1.00 2.00 250 400 A
150
mV
60
mV
(Note 9)
75
95 140
mV
(Note 9) MIC29201, MIC29202, MIC29204
15
mV
1.3 Low (ON) High (OFF) 0.7 2.0 30 50 100 600 750 10 20
V
Shutdown Pin Input Current
VSHUTDOWN = 2.4V
A
VSHUTDOWN = 26V Regulator Output Current in Shutdown (Note 10)
450
A A
3
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January 1998
MIC2920A/29201/29202/29204
Micrel
General Note: Devices are ESD protected; however, handling precautions are recommended. Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ (MAX), the junction-to-ambient thermal resistance, JA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: P(MAX) = (TJ(MAX) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The junction to ambient thermal resistance of the MIC29204BM is 160C/W mounted on a PC board. Note 2: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 3: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 4: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V differential. At low values of programmed output voltage, the minimum input supply voltage of 4.3V over temperature must be taken into account. The MIC2920A operates down to 2V of input at reduced output current at 25C. Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin current. Note 6: The MIC2920A features fold-back current limiting. The short circuit (VOUT = 0V) current limit is less than the maximum current with normal output voltage. Note 7: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 200mA load pulse at VIN = 20V (a 4W pulse) for T = 10ms. Note 8: VREF VOUT (VIN - 1 V), 4.3V VIN 26V, 1 mA < IL 400 mA, TJ TJ MAX. Note 9: Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT /VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. Note 10: VSHUTDOWN 2V, VIN 26V,VOUT = 0, with Adjust pin tied to 5V Tap or to the R1, R2 junction (see Figure 3) with R1 150k. Note 11: When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. Note 12: Maximum positive supply voltage of 60V must be of limited duration (< 100ms) and duty cycle ( 1%). The maximum continuous supply voltage is 26V.
3
Schematic Diagram
IN ADJUST
R18 20k
Q15A Q15B
Q24 Q26 Q25 Q9 Q3
OUT
R11 18 k
Q4
Q7 Q5 Q8
SENSE Q14
Q6 Q1 10
R1 20 k
C1 20 pF
R11 20.6 k
Q2
Q20
Q16
Q17
R17 12 k
R27 V TAP R28
Q42
R8 31.4 k
R10 150 k
Q22 Q21
C2 40 pF
Q23
R2 50 k
R5 180 k
Q13
R6 140 k
Q12
R9 27.8 k
R15 100 k
Q40 Q41
R12 110 k
Q11
R13 100 k
R14 350 k
Q29
R16 30 k
R17 10
R30 30 k
Q18
Q19 Q28
R3 50 k
R4 13 k
R21 8
50 k
Q37 Q36
Q30 Q31
SHDN
R22 150 k
R24 50 k
R23 60 k
10 k
ERROR Q38
R26 60 k
Q34
R25 2.8 k
DENOTES CONNECTION ON MIC2920A-xx AND MIC29201-xx VERSIONS ONLY
Q39
GND
January 1998
3-13
MIC2920A/29201/29202/29204
Micrel
Typical Characteristics
Dropout Voltage vs. Output Current
500 DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
Dropout Voltage vs. Temperature
700
Dropout Characteristics
6 OUTPUT VOLTAGE (V) 5 4 3 2 ILOAD = 400mA 1 0 0 1 2 3 4 5 INPUT VOLTAGE (V) 6 ILOAD = 1mA
400 300 200 100 0
600 500 400 300 200 100 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) ILOAD = 400mA
0
100 200 300 400 OUTPUT CURRENT (mA)
Ground Current vs. Output Current
20 GROUND CURRENT (mA) GROUND CURRENT (A) 10 200
Ground Current vs. Supply Voltage
30 GROUND CURRENT (mA) 25 20 15 10 5 0 0
Ground Current vs. Supply Voltage
150
100 VOUT = 5V IOUT = 1mA 50
1
VOUT = 5V IOUT = 400mA 2 4 6 8 INPUT VOLTAGE (V) 10
0.1
1
10 100 400 OUTPUT CURRENT (mA)
0
0
1
234567 SUPPLY VOLTAGE (V)
8
Ground Current vs. Temperature
0.20
GROUND CURRENT (mA)
Ground Current vs. Temperature
3 GROUND CURRENT (mA) 25 20
Ground Current vs. Temperature
GROUND CURRENT (mA)
0.15
2
ILOAD = 400mA 15 10 5 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
ILOAD = 100mA
0.10 IOUT = 1mA
1
0.05
0.00 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
Fixed 3.3V Output Voltage vs. Temperature
3.40 OUTPUT VOLTAGE (V) 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 3.20 -60 -30 0 30 60 90 120 150 TEMPERATURE (C) CURRENT (mA) 700 650 600 550 500 450 400 350
Short Circuit and Maximum Current vs. Temperature
GROUND CURRENT (A)
VOUT = VNOMINAL - 0.5V VOUT = 3.3V
Ground Current vs. Supply Voltage
1000 900 R LOAD = 100 800 700 600 500 400 300 200 100 0 -100 -30 -20 -10 0 10 20 INPUT VOLTAGE (V)
3 SAMPLES (HI/AVG/LO)
VOUT = 0V
300 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
30
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January 1998
MIC2920A/29201/29202/29204
Micrel
MIC29201/2 Shutdown Current vs. Temperaure
OUTPUT (mA) OUTPUT (mV)
ENABLE CURRENT (A)
100 0 -100 600 -200 400 200 0 -200 -5 0
COUT = 10F
OUTPUT (mA) OUTPUT (mV)
125 100 VEN = 5V 75 50 VEN = 2V 25 0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
Load Transient
200 100 50 0 -50 600 -100 400 200 0 -200 -5 0
Load Transient
COUT = 100F
1mA
1mA
5 10 15 TIME (ms)
20
25
5 10 15 TIME (ms)
20
25
MIC29202 Adjust Pin Current vs. Temperature
OUTPUT (mV)
ADJUST PIN CURRENT (nA)
20 0 -20 10 -40 8 6
40 30 20 10 ILOAD = 1mA
COUT = 10 F IL = 10mA
OUTPUT (mV)
50
Line Transient
40 20 10 0 -10 10 -20 8 6
Line Transient
COUT = 100 F IL = 10mA
3
INPUT (V)
0 -60 -30 0 30 60 90 120 150 TEMPERATURE (C)
4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 TIME (ms)
INPUT (V)
4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 TIME (ms)
Output Impedance vs. Frequency
10
OUTPUT IMPEDANCE ()
1
0.1 ILOAD = 10mA 0.01
1x100
100x100
1x103
100x103
10x100
1
10
100 1k 10k 100k 1M FREQUENCY (Hz)
Ripple Rejection
0 CL = 10F -20 REJECTION (dB) IL = 100mA -40 -60 -80 -100 1E+1 1E+2 1E+3 1E+4 1E+5 1E+6 10 100 1k 10k 100k 1M FREQUENCY (Hz) 1mA
January 1998
3-15
10x103
1x106
MIC2920A/29201/29202/29204
Micrel
system requirements, this resistor may be returned to the 5V output or some other supply voltage. In determining a value for this resistor, note that while the output is rated to sink 250A, this sink current adds to battery drain in a low battery condition. Suggested values range from 100k to 1M. The resistor is not required if this output is unused.
Applications Information
External Capacitors
A 10F (or greater) capacitor is required between the MIC2920A output and ground to prevent oscillations due to instability. Most types of tantalum or aluminum electrolytics will be adequate; film types will work, but are costly and therefore not recommended. Many aluminum electrolytics have electrolytes that freeze at about -30C, so solid tantalums are recommended for operation below -25C. The important parameters of the capacitor are an effective series resistance of about 5 or less and a resonant frequency above 500kHz. The value of this capacitor may be increased without limit. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 2.2F for current below 10mA or 1F for currents below 1mA. Adjusting the MIC29202/29204 to voltages below 5V runs the error amplifier at lower gains so that more output capacitance is needed. For the worst-case situation of a 500mA load at 1.23V output (Output shorted to Adjust) a 47F (or greater) capacitor should be used. The MIC2920A/29201 will remain in regulation with a minimum load of 1mA. When setting the output voltage of the MIC29202/ 29204 versions with external resistors, the current through these resistors may be included as a portion of the minimum load. A 0.1F capacitor should be placed from the MIC2920A input to ground if there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the input.
Programming the Output Voltage (MIC29202/29204)
The MIC29202/29204 may be programmed for any output voltage between its 1.235V reference and its 26V maximum rating, using an external pair of resistors, as shown in Figure 3. The complete equation for the output voltage is VOUT = VREF x { 1 + R1/R2 } - |IFB| R1 where VREF is the nominal 1.235 reference voltage and IFB is the Adjust pin bias current, nominally 20nA. The minimum recommended load current of 1A forces an upper limit of 1.2M on the value of R2, if the regulator must work with no load (a condition often found in CMOS in standby), IFB will produce a -2% typical error in VOUT which may be eliminated at room temperature by trimming R1. For better accuracy, choosing R2 = 100k reduces this error to 0.17% while increasing the resistor program current to 12A. Since the MIC29202/29204 typically draws 110A at no load with SHUTDOWN open-circuited, this is a negligible addition. The MIC29204 may be pin-strapped for 5V using the internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (Adjust) to Pin 6 (V Tap).
Configuring the MIC29201-3.3BM
For the MIC29201-3.3BM, the output (Pin 1) and sense pin (pin 2), must be connected to ensure proper operation. They are not connected internally.
Error Detection Comparator Output (MIC29201/MIC29204)
A logic low output will be produced by the comparator whenever the MIC29201/29204 output falls out of regulation by more than approximately 5%. This figure is the comparator's builtin offset of about 75mV divided by the 1.235V reference voltage. (Refer to the block diagram on Page 1). This trip level remains "5% below normal" regardless of the programmed output voltage of the MIC29201/29204. For example, the error flag trip level is typically 4.75V for a 5V output or 11.4V for a 12V output. The out of regulation condition may be due either to low input voltage, extremely high input voltage, current limiting, or thermal limiting. Figure 1 is a timing diagram depicting the ERROR signal and the regulated output voltage as the MIC29201/29204 input is ramped up and down. The ERROR signal becomes valid (low) at about 1.3V input. It goes high at about 5V input (the input voltage at which VOUT = 4.75). Since the MIC29201/29204's dropout voltage is load-dependent (see curve in Typical Performance Characteristics), the input voltage trip point (about 5V) will vary with the load current. The output voltage trip point (approximately 4.75V) does not vary with load. The error comparator has an NPN open-collector output which requires an external pull-up resistor. Depending on
Reducing Output Noise
In reference applications it may be advantageous to reduce the AC noise present at the output. One method is to reduce the regulator bandwidth by increasing the size of the output
4.75V OUTPUT VOLTAGE
ERROR
NOT VALID
*
5V 1.3V
NOT VALID
*
INPUT VOLTAGE
* SEE APPLICATIONS INFORMATION
Figure 1. ERROR Output Timing
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January 1998
MIC2920A/29201/29202/29204
capacitor. This is relatively inefficient, as increasing the capacitor from 1F to 220F only decreases the noise from 430V to 160VRMS for a 100kHz bandwidth at 5V output. Noise can be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick 1 CBYPASS 2 R1 * 200 Hz or about 0.01F. When doing this, the output capacitor must be increased to 10F to maintain stability. These changes reduce the output noise from 430V to 100V rms for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages.
Micrel
Automotive Applications
The MIC2920A is ideally suited for automotive applications for a variety of reasons. It will operate over a wide range of input voltages with very low dropout voltages (40mV at light loads), and very low quiescent currents (100A typical). These features are necessary for use in battery powered systems, such as automobiles. It is a "bulletproof" device with the ability to survive both reverse battery (negative transients up to 20V below ground), and load dump (positive transients up to 60V) conditions. A wide operating temperature range with low temperature coefficients is yet another reason to use these versatile regulators in automotive designs.
Typical Applications
V IN 100k +VIN VOUT + GND *V OUT 5V ERROR OUTPUT 5 ERROR +VIN 8 VIN VOUT 1
VOUT 1.2 26V
VOUT = 5V
10F
3
SHUTDOWN 3 SHUTDOWN INPUT
OFF ON
870 10F 25
GND ADJUST 7 4 1.23V R1 ) R2 V REF
R1 100 pF
VOUT = VREF x (1 +
R2
NOTE: PINS 2 AND 6 ARE LEFT OPEN
Figure 2. MIC2920A-5.0 Fixed +5V Regulator
Figure 3. MIC29202/29204 Adjustable Regulator. Pinout is for MIC29204.
5.3V
+VIN 8 +VIN ERROR OUTPUT SHUTDOWN INPUT
ON
8 +VIN
VCC OUT VOUT 1
5 ERROR 3
OFF
*VOUT VIN VOUT 1
SHUTDOWN INPUT
3
HIGH = OFF
SHUTDOWN 100pF GND 4 ADJUST 7 220k 1% 2N2222 300k 1%
MIC2951
LOW = ON
+ 10F
SD GND 4
ADJUST FB
7
HIGH = 5V OUT
470 k
180k 1%
LOW = 3.3V OUT
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV TO 400mV, DEPENDING ON LOAD CURRENT.
PIN 3 LOW= ENABLE OUTPUT. Q1 ON = 3.3V, Q1 OFF = 5.0V.
Figure 4. MIC29204 Wide Input Voltage Range Current Limiter
Figure 5. MIC29202/29204 5.0V or 3.3V Selectable Regulator with Shutdown. Pinout is for MIC29204.
January 1998
3-17

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