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Preliminary Datasheet

18V, 2A Synchronous DC-DC Buck Converter AP3512E

Dec. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

General Description

The AP3512E is a 500kHz fixed frequency, current

mode, PWM synchronous buck (step-down) DC-DC

converter, capable of driving a 2A load with high

efficiency, excellent line and load regulation. The

AP3512E exhibits high efficiency at light load. The

device integrates N-channel power MOSFET switch

with low on-resistance. Current mode control

provides fast transient response and cycle-by-cycle

current limit.

The AP3512E 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 SOIC-8 and PSOP-8 packages.

Features

• Input Voltage Range: 4.5V to 18V

• Fixed 500kHz Frequency

• High Efficiency at Light Load

• Output Current: 2A

• 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

• Monitor

• TV

• STB

• Datacom

Figure 1. Package Types of AP3512E

SOIC-8 PSOP-8

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