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Global Mixed-mode Technology Inc.
G5104
300mA Alkaline Boost DC/DC Converters in SOT-23-5
Features
Configurable Output Voltage Up to 5.5V 40A Quiescent Current <1A Shutdown Current <1A Shutdown Pin Current Supply Range from 1.7V to 5.5V Low VDS(on): 120mV (ISW=400mA) Tiny SOT-23-5 Package
General Description
The G5104 boost converter is designed for 3.3V/5V powered system. Due to a typical 40A quiescent current and 1.7V~ 5.5V supply voltage range, it is suitable for battery powered portable applications. Such as PDAs and Handheld Computers. When the IC sets to shutdown mode, it only consumes less than 1A. Furthermore, the 500mA current limit, 450ns fixed minimum off-time and tiny SOT23-5 package facilitates the use of smaller inductor and other surface-mount components to minimize the PCB size in those space-conscious applications. To control the IC, no other external current is needed for the shutdown pin. It typically consumes less than 1A of full supply range.
Applications
Personal Digital Assistants (PDAs) Handheld Computers Digital Still Cameras Cellular Phones WebPad Local 3V to 5V Conversion
Ordering Information
ORDER NUMBER
G5104T11U Note:T1: SOT-23-5 U: Tape & Reel
ORDER NUMBER (Pb free)
G5104T1Uf
MARKING
5104X
TEMP. RANGE
-40C ~ +85C
PACKAGE
SOT-23-5
Pin Configuration
Typical Application Circuit
4.7H VIN 3V SW 1 5 VCC VCC SW 1M GND 2 10pF (option)
5V 300mA
G5104 G963
47F 4 SHDN
G5104
SHDN GND FB 316k 47F
FB 3
SOT-23-5
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
SW to GND.........................................-0.3V to +7V FB to GND............... ............................-0.3V to VCC VCC, SHDN to GND...................................-0.3V to +7V Operating Temperature Range (Note 1) -40C to +85C
G5104
Junction Temperature ......................................+125C Storage Temperature........................-65C to +150C Reflow Temperature (Soldering, 10 sec)..........+260C
Stress beyond those listed under "Absolute Maximum Rating" may cause permanent damage to the device.
Electrical Characteristics
(VCC = 3.6V, V SHDN = 3.6V, TA = 25C)
PARAMETER
Input Voltage Range Quiescent Current FB Comparator Trip Point Output Voltage Line Regulation FB Pin Bias Current (Note 2) Switch Off Time Switch VDS(ON) Switch Current Limit
SHDN Pin Current
CONDITIONS
Not Switching V SHDN = 0V 2.5VMIN
1.7 ----1.18 --------400 --0.9 ---
TYP
--40 0.1 1.2 -0.05 --450 120 500 0.1 ----0.01
MAX
5.5 80 1 1.22 --1 --160 600 1 --0.25 5
UNITS
V A A V %/V A ns mV mA A V V A
SHDN Input Voltage High SHDN Input Voltage Low
Switch Leakage Current
Switch Off, VSW = 7V
---
Note 1: The G5104 are guaranteed to meet performance specifications from 0C to 85C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 2: Bias current flows into the FB pin.
Block Diagram
L1 VIN C1 VCC SHDN SW C2 VOUT
VOUT
BIAS
SHUTDOWN LOGIC
C3 (option)
R1 +
ERROR COMP en_sw
PUMP CONTROL OC DRIVER COMP
FB R2
+
TOFF PULSE CONTROL
1.2V
VREF
GND
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VCC=+3V, V SHDN =+3V, L=4.7H, TA=25C, unless otherwise noted.)
G5104
Feedback Voltage vs. Input Voltage
1.5 1.5
Feedback Voltage vs. Temperature
Feedback Voltage (V)
Feedback Voltage (V)
1.2
1.2
0.9
0.9
0.6
0.6
0.3
0.3
0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
0 -40 -20 0 20 40 60 80 100
Input Voltage (V)
Temperature (C)
RDS_on vs. Input Voltage
600 500 400
RDS_on vs. Temperature
RDS_on (m)
300 400 300 200 100 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 0 -40 -20 0 20 40 60 80 100
RDS_on (m)
200
100
Input Voltage (V)
Temperature (C)
Current Limit vs. Input Voltage
600 500 800 700
Current Limit vs. Temperature
Current Limit (mA)
400 300 200 100 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Current Limit (mA)
600 500 400 300 200 100 0 -40 -20 0 20 40 60 80 100
Input Voltage (V)
Temperature (C)
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Efficiency vs. Input Voltage
90 85 90 VIN=3.0V 85 VIN=4.2V
G5104
Efficiency vs. Output Current
Efficiency (%)
Efficiency (%)
80 75 70 65 60 1.5 2 2.5 3 3.5 4 4.5
80 75 70 65 60 0.1 1
VIN=2.4V VIN=1.7V VIN=3.6V
VO=5V, IO=100mA
10
100
1000
Input Voltage (V)
Output Current (mA)
Line Transient
Load Transient
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Global Mixed-mode Technology Inc.
Pin Description
PIN
1 2 3 4 5
G5104
NAME
SW GND FB
SHDN
FUNCTION
Switch Pin. The drain of the internal NMOS power switch. Connect this pin to inductor. Ground. Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Block Diagram): R1 = R2
VOUT -1 1.2
VCC
Active-Low Shutdown Pin. Tie this pin to logic-high to enable the device or tied it to logic-low to turn this device off. Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible.
Function Description
The G5104 is a boost converter with a NMOS switch embedded (refer to Block Diagram). The boost cycle is getting started when FB pin voltage drop below 1.2V as the NMOS switch turns on. During the switch on period, the inductor current ramps up until 500mA current limit is reached. Then turns the switch off, while the inductor current flows through external schottky diode, and ramps down to zero. During the switch off period, the inductor current charges output capacitor and the output voltage is boosted up. This pumping mechanism continues cycle by cycle until the FB pin voltage exceed 1.2V and entering the none switching mode.
delay time. During this time, the inductor current exceeds the current limit by a small amount. The formula below can calculate the peak inductor current. IPEAK = ILIM +
VIN(MAX ) - VSAT x 100ns L
Applications Information
Choosing an Inductor There are several recommended inductors that work well with the G5104 in Table 1. Use the equations and recommendations in the next few sections to find the proper inductance value for your design. Table 1. Recommended Inductors
PART
LQH3C4R7 LQH3C100 LQH3C220 972AS-4R7M 972AS-100M A914BYW-4R7 M A914BYW-100M
Where VSAT = 0.2V (switch saturation voltage). When the systems with high input voltages and uses smaller inductance value, the current overshoot will be most apparent. This overshoot can be useful as it helps increase the amount of available output current. To use small inductance value for systems design, the current limit overshoot can be quite high. Even if it is internally current limited to 500mA, the power switch of the G5104 can operate larger currents without any problem, but the total efficiency will suffer. The IPEAK is keep below 700mA for the G5104 will be obtained best performance. Capacitor Selection Low ESR (Equivalent Series Resistance) capacitors should be used at the output to minimize the output ripple voltage and the peak-to-peak transient voltage. Multilayer ceramic capacitors (MLCC) are the best choice, as they have a very low ESR and are available in very small packages. Their small size makes them a good match with the G5104's SOT-23 package. If solid tantalum capacitors (like the AVX TPS, Sprague 593D families) or OS-CON capacitors are used, they will occupy more volume than a ceramic ones and the higher ESR increases the output ripple voltage. Notice that use a capacitor with a sufficient voltage rating. A low ESR surface-mount ceramic capacitors also make a good selection for the input bypass capacitor, which should be placed as close as possible to the G5104. A 47F input capacitor is sufficient for most applications.
VALUE(H) MAX DCR ()
4.7 10 22 4.7 10 4.7 10 0.26 0.30 0.92 0.22 0.48 0.072 0.125
VENDOR
Murata www.murata.com TOKO www.toko.co.jp
Current Limit Overshoot The G5104 use a constant off-time control scheme, the power switch is turned off after the 500mA current limit is reached. When the current limit is reached and when the switch actually turns off, there is a 100ns
Ver: 1.2 Mar 01, 2005
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Global Mixed-mode Technology Inc.
Diode Selection For most G5104 applications, the high switching frequency requires a high-speed rectifier Schottky diodes, such as the VISHAY SS12 (1A, 20V) with their low forward voltage drop and fast switching speed, are recommended. Many different manufacturers make equivalent parts, but make sure that the component is rated to operate at least 0.5A. To achieve high efficiency, the average current rating of the Schottky diodes should be greater than the peak switching current. Choose a reverse breakdown voltage greater than the output voltage. Lowering Output Voltage Ripple The G5104 supplies energy to the load in bursts by
G5104
ramping up the inductor current, then delivering that current to the load. To use low ESR capacitors will help minimize the output ripple voltage, but proper selection of the inductor and the output capacitor also plays a big role. If a larger inductance value or a smaller capacitance value is used, the output ripple voltage will increase because the capacitor will be slightly overcharged each burst cycle. To reduce the output ripple, increase the output capacitance value or add a 10pF feed-forward capacitor in the feedback network of the G5104 (see the circuits in the Typical Applications section). To add this small, inexpensive 10pF capacitor will greatly reduce the output voltage ripple.
Typical Applications
Boost Converter
L1 4.7H VIN 2.5V to 4.2V VCC SW R1 1M C2 47F R2 316k D1 5V 300mA VIN 2.7V to 4.2V C1
LED Driver
L1 D1 VOUT C2 up to 9 LEDs VCC SW
G5104
SHDN C1 47F GND FB
G5104
PWM Dimming SHDN GND FB RS
L1: MURATA LQH3C4R7M24 D1: VISHAY SS12
C1: MLCC 4.7F 6.3V C2: MLCC4.7F 35V L1: MURATA LQH3C4R7M24 D1: MOTOROLA MBR0540 D2: RB751V RS: 60 1% M1: FDN337N
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Global Mixed-mode Technology Inc.
Package Information
G5104
C L
D
E
H
e1 e
1
A A2 A1
b
Note:
1. 2. 3. 4. Package body sizes exclude mold flash protrusions or gate burrs Tolerance 0.1000 mm (4mil) unless otherwise specified Coplanarity: 0.1000mm Dimension L is measured in gage plane SYMBOL
A A1 A2 b C D E e e1 H L 1
MIN
1.00 0.00 0.70 0.35 0.10 2.70 1.40 --------2.60 0.37 1
DIMENSIONS IN MILLIMETER NOM
1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.95 2.80 -----5
MAX
1.30 0.10 0.90 0.50 0.25 3.10 1.80 --------3.00 ----9
Taping Specification
PACKAGE
SOT-23-5
Feed Direction
Q'TY/BY REEL
3,000 ea
SOT-23-5 Package Orientation
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.
Ver: 1.2 Mar 01, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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