G5111 ETC | Alldatasheet
Document overview
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Technical content
Features
Configurable Output Voltage Up to 14V 20µA Quiescent Current <1µA Shutdown Current <1µA Shutdown Pin Current Supply Range from 2.5V to 6.5V Low VCESAT: 250mV (ISW=300mA) Tiny SOT23-5 Package
Applications
STN/TFT LCD Bias Personal Digital Assistants (PDAs) Handheld Computers Digital Still Cameras Cellular Phones WebPad White LED Driver Local 3V to 5V Conversion General Description The G5111 boost converter is designed for small/ me- dium size LCD panel of high bias voltage. Due to a typical 20µA quiescent current and 2.5V~6.5V supply voltage range, it is suitable for bat- tery powered portable applications. Such as PDAs and Handheld Computers. When the IC sets to shutdown mode, it only consumes less than 1µA. Furthermore, the 350mA current limit, 500ns fixed minimum off-time and tiny SOT23-5 package facili- tates the use of smaller inductor and other sur- face-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 1µA of full supply range.
Ordering Information
PART TEMP. RANGE PIN-PACKAGE G5111 -40°C ~ +85°C SOT23-5 Pin Configuration Typical Application Circuit G963 VCC SHDN SOT23-5 G5111 1SW GND FB VCC SW SHDN FB GND G5111 10pF 1µF 4.7µF 10µH 110k VIN 2.5V to 4.2V 12V 10mA G963 VCC SHDN SOT23-5 G5111 1SW GND FB G963 VCC SHDN SOT23-5 G5111 1SW GND FB VCC SW SHDN FB GND G5111 10pF 1µF 4.7µF 10µH 110k VIN 2.5V to 4.2V 12V 10mA
Ver 0.2 Preliminary Jan 09, 2002 TEL: 886-3-5788833 http://www.gmt.com.tw G5111 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Operating Temperature Range (Note 1) ..-40°C to +85°C Lead Temperature (Soldering, 10 sec).…………..+300°C Stress beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device.
Electrical Characteristics
(VCC = 2.5V, V SHDN = 2.5V, TA = 25°C) PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage Range 2.5 6.5 V Not Switching 20 30 µA Quiescent Current V SHDN = 0V 0.1 1 µA FB Comparator Trip Point T A = 0°C ~ 85°C 1.18 1.2 1.22 V Output Voltage Line Regulation 2.5V<V IN<6.5V 0.05 %/V FB Pin Bias Current (Note 2) V FB = 1.2V, TA = 0°C ~ 85°C 30 80 nA VFB > 1V 500 ns Switch Off Time VFB < 0.6V 1.6 µs Switch VCESAT I SW = 300mA 250 350 mV Switch Current Limit 300 350 400 mA SHDN Pin Current 0.1 1 µA SHDN Input Voltage High 0.9 V SHDN Input Voltage Low 0.25 V Switch Leakage Current Switch O ff, VSW = 5V 0.01 5 µA Note 1: The G5111 are guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the -40°C to 85°C operating temperature range are assured by design, characterization and correlation with sta- tistical process controls. Note 2: Bias current flows into the FB pin. Block Diagram 5 4 VREF BIAS SHUTDOWN LOGIC SW SHDNVCC VOUT FB ERROR COMP 1.2V en_sw GND PUMP CONTROL OC COMP NPN DRIVER TOFF PULSE CONTROL VOUTVIN 5 4 VREF BIAS SHUTDOWN LOGIC SW SHDNVCC VOUT FB ERROR COMP 1.2V en_sw GND PUMP CONTROL OC COMP NPN DRIVER TOFF PULSE CONTROL VOUTVIN
G5111 Global Mixed-mode Technology Inc. 1 SW Switch Pin. The collector of the internal NPN power switch. Connect this pin to inductor. 5 VCC Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. external schottky diode, and ramps down to zero. proper inductance value for your design. Table 1. Recommended Inductors be occurs (see Current Limit Overshoot section). below can calculate the peak inductor current.
Ver 0.2 Preliminary Jan 09, 2002 TEL: 886-3-5788833 http://www.gmt.com.tw G5111 Global Mixed-mode Technology Inc. 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 G5111’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 G5111. A 4.7µF input capacitor is sufficient for most applications. Diode Selection For most G5111 applications, the high switching fre- quency requires a high-speed rectifier Schottky diodes, such as the Motorola MBR0520 (0.5A, 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 0.35A. To achieve high effi- ciency, the average current rating of the Schottky di- odes should be greater than the peak switching cur- rent. Choose a reverse breakdown voltage greater than the output voltage. Lowering Output Voltage Ripple The G5111 supplies energy to the load in bursts by 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 G5111 (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 SEPIC Converter VCC SW SHDN FB GND G5111 10pF 22µF 4.7µF 4.7µH 120k V IN 2.5V to 4.2V 390k 50mA 5 1 10µH VCC SW SHDN FB GND G5111 10pF 22µF 4.7µF R2 270k VIN 2.5V to 4.2V 470k 3.3V 60mA 5 1 1µF L1:MURATA LQH3C4R7M24 (814) 237-1431 D1:MOTOROLA MBR0520 (800) 441-2447 L1,L2:MURATA LQH3C100K24 (814) 237-1431 D1:MOTOROLA MBR0520 (800) 441-2447 10µH VCC SW SHDN FB GND G5111 10pF 22µF 4.7µF 4.7µH 120k V IN 2.5V to 4.2V 390k 50mA 5 1 10µH VCC SW SHDN FB GND G5111 10pF 22µF 4.7µF R2 270k VIN 2.5V to 4.2V 470k 3.3V 60mA 5 1 1µF L1:MURATA LQH3C4R7M24 (814) 237-1431 D1:MOTOROLA MBR0520 (800) 441-2447 L1,L2:MURATA LQH3C100K24 (814) 237-1431 D1:MOTOROLA MBR0520 (800) 441-2447 10µH
Ver 0.2 Preliminary Jan 09, 2002 TEL: 886-3-5788833 http://www.gmt.com.tw G5111 Global Mixed-mode Technology Inc.
Package Information
Note: 1. Package body sizes exclude mold flash protrusions or gate burrs 2. Tolerance ±0.1000 mm (4mil) unless otherwise specified 3. Coplanarity: 0.1000mm 4. Dimension L is measured in gage plane DIMENSIONS IN MILLIMETERS SYMBOLS MIN NOM MAX A 1.00 1.10 1.30 A1 0.00 ----- 0.10 A2 0.70 0.80 0.90 b 0.35 0.40 0.50 C 0.10 0.15 0.25 D 2.70 2.90 3.10 E 1.40 1.60 1.80 H 2.60 2.80 3.00 θ1 1º 5º 9º Taping Specification E e D H L C b A E e D H L C b A Feed Direction Feed Direction