ST3103 1A Synchronous Buck Converter
Specifications
Input Voltage (VIN)2.5~5.5V
Output Current (IOUT)>1A
Output Voltage (VOUT/FB)FB=0.6V (0.588~0.612V), output 0.6V~VIN
FB/VOUT Accuracy±3%
Current Consumption (IQ)40uA (typ)
Switching Frequency1.5MHz (fixed)
Modulation ModePWM (constant-freq current-mode)
SynchronousSynchronous
Typical PerformanceUp to 96% efficiency; UVLO, current limit, short-circuit protection, thermal shutdown(160℃); soft-start, 100% duty
PackageSOT23-5, DFN2*2-6L
Product details
Overview
ST3103 is a synchronous current-mode step-down DC-DC converter with an input voltage range of 2.5V to 5.5V, supporting single Li+/Li- cell, multiple alkaline/NiMH cells, USB and other power supply applications. The output voltage ranges from 0.6V to the input voltage. It internally integrates a power NMOS switching MOSFET and a synchronous PMOS rectifier MOSFET, minimizing external components and achieving high efficiency. ST3103 employs a constant-frequency current-mode PWM control scheme providing excellent stability and transient response. In shutdown mode, the input is disconnected from the output, shutdown current is less than 0.1uA, and ST3103 also features under-voltage lockout, current limiting, and thermal protection.
Features
- Up to 96% efficiency
- Quiescent current 40uA (typical)
- Greater than 1A output load current
- Integrated synchronous conversion topology
- 1.5MHz switching frequency
- Soft-start
- Under-voltage lockout
- Short-circuit protection
- Thermal shutdown
Typical Applications
- Portable telephones
- Portable devices
- Wireless equipment
- Wireless phones
- Computer peripherals
- Battery-powered accessories
- Electronic instruments
