AP3503

Data Sheet 340kHz, 3A Synchronous DC-DC Buck Converter AP3503 General Description The AP3503 is a 340kHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 3A load with high efficiency, excellent line and load regulation. The device integrates N-channel power MOSFET switches with low on-resistance. Current mode control provides fast transient response and cycle-by-cycle current limit. The AP3503 employs complete protection to ensure system security. Including output Over Voltage Protection, input Under Voltage LockOut, programmable soft-start, Over Temperature Protection to safeguard the circuit. This IC is available in PSOP-8 package. Features Input Voltage Range: 4.5V to 18V Fixed 340kHz Frequency High Efficiency: up to 95% Output Current: 3A Current Mode Control Built-in Over Current Protection Built-in Thermal Shutdown Function Built-in UVLO Function Built-in Over Voltage Protection Programmable Soft-start Applications LCD TV Set Top Box Portable DVD Digital Photo Frame PSOP-8 Figure 1. Package Type of AP3503 May. 2012 Rev. 1. 7 BCD Semiconductor Manufacturing Limited 1 340kHz, 3A Synchronous DC-DC Buck Converter Pin Configuration MP Package (PSOP-8) Data Sheet AP3503 18 27 36 45 Pin Description Figure 2. Pin Configuration of AP3503 (Top View) Pin Number 1 2 3 4 5 6 7 8 Pin Name BS IN SW GND FB COMP EN SS EP Function Bootstrap pin. A bootstrap capacitor is connected between the...