Diodes AT5503 Manuel d'utilisateur télécharger pdf

Preliminary Datasheet

18V, 3A Synchronous DC-DC Buck Converter AT5503

Mar. 2013 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

General Description

The AT5503 is a 500kHz 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

AT5503 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 AT5503 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 500kHz Frequency

• High Efficiency at Light Load

• 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

• Monitor

• TV

• STB

• Datacom

Figure 1. Package Type of AT5503

PSOP-8

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