AP3503E Datasheet, PDF (1/11 Pages) BCD Semiconductor Manufacturing Limited – 340kHz, 3A Synchronous DC-DC Buck Converter Current Mode Control

Preliminary Datasheet
340kHz, 3A Synchronous DC-DC Buck Converter
AP3503E
General Description
The AP3503E 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
AP3503E exhibits high efficiency at light load. 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 AP3503E employs complete protection to ensure
system security. Including output Over Voltage
Protection, input Under Voltage Lock Out,
programmable Soft Start, Over Temperature
Protection and hiccup mode Short Circuit Protection.
This IC is available in PSOP-8 package.
Features
• Input Voltage Range: 4.5V to 18V
• Fixed 340kHz Frequency
• High Efficiency at Light Load
• 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
• Hiccup Mode SCP
Applications
• LCD TV
• Set Top Box
• Portable DVD
• Digital Photo Frame
May. 2012 Rev. 1. 6
PSOP-8
Figure 1. Package Type of AP3503E
BCD Semiconductor Manufacturing Limited
1