Document
SC46208
1.25MHz, 600mA, HIGH EFFICIENCY SYNCHRONOUS STEP-DOWN DC-DC CONVERTER
DESCRIPTION
SC46208 is a synchronous step-down DC-DC converter with high efficiency. It adopts small flat package. The device features 2.5~5.5V input voltage, 600mA output current, peak current mode PWM and integrated compensation net, which is ideal for powering portable equipment that runs from a single cell Li+ battery without external components. The device integrates an internal switch which eliminates the Schottky diode, 1.25MHz high frequency allows the periphery to adopt SMT inductor and capacitor, thus reduce the size of total solution. It can also run at 100% duty cycle for low dropout operation, that is lower than 1μA shutdown current and 20μA quiescent current in power saving mode. It extends battery life in portable system through increasing the efficiency under light loads. SC46208 is available in an adjustable version and fixed version.
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APPLICATION
* Cellular Telephones * PDAs * Wireless Equipment * MP3 player * Digital Camera * Portable Instruments
FEATURES
* High efficiency up to 95% * Automatic Power Saving Mode at light loads, only 20μA quiescent current. * Wide input voltage range: +2. 5V~+5.5V * Output voltage range: 0.6V~VIN * High output current 600mA * Low dropout operation: 100% * Shutdown current<1μA * 1.25MHz fixed frequency * No Schottky diode required * Thermal shutdown protection * 4KV HBM ESD protection * Small 5-pin SOT-23package
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1
2008.09.10 Page 1 of 11
SC46208
ORDERING INFORMATION
Device no SC46208 SC4620810 SC4620812 SC46208XX SC4620815 SC4620818 SC4620825 SC4620833 Seal name 6208 20810 20812 20815 20818 20825 20833 Package SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 voltage: Default: adjustable 10 :1.0V 12 :1.2V 15 :1.5V 18 :1.8V 25 :2.5V 33 :3.3V Remark Note: “××” indicates the output
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BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1
2008.09.10 Page 2 of 11
SC46208
ABSOLUTE MAXIMUM RATING
Characteristics Input Supply Voltage VIN Enable Voltage EN SW Voltage Output Feedback Voltage Operating Temperature Storage Temperature ESD Characteristic(HBM) Symbol VIN VEN VSW VFB Tamb TSTG ESD Rating -0.3 ~ +6 -0.3 ~ VIN -0.3 ~ VIN+0.3 -0.3 ~ +6 -40 ~ + 85 -65 ~ +125 4.0 Unit V V V V °C °C KV
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ELECTRICAL CHARACTERISTICS(unless otherwise noted, Tamb =25°C, VIN=3.6V, L=2.2μH, COUT=10μF,
load current ILOAD=0) Characteristics Input Voltage Range Feedback Voltage Quiescent Current (Switch Off) Quiescent Current (Shutdown Mode) Quiescent Current (PWM Mode) Output Voltage Regulation Output Voltage Load Regulation Feedback Current PMOS On Resistor NMOS On Resistor PMOS Limit Current Switch Frequency Max. Duty Switch Leakage Current SW EN Input High Level EN Input Low Level EN Leakage Current Thermal Shutdown Temperature Thermal Shutdown Hysteresis Temperatu.