ACE727Z

18V, 3A, High Efficiency Synchronous Step-Down Converter

VER 1.1

1

Description

ACE727Z is a wide input range, high-efficiency and high frequency DC-to-DC step-down switching

regulator, capable of delivering up to 3A of output current. With a fixed switching frequency of 500 KHz,

this current mode PWM controlled converter allows the use of small external components, such as

ceramic input and output caps, as well as small inductors. ACE727Z also employs a proprietary control

scheme that switches the device into a power save mode during light load, thereby extending the range of

high efficiency operation. An OVP function protects the IC itself and its downstream system against input

voltage surges. With this OVP function, the IC can stand off input voltage as high as 20V, making it an

ideal solution for industrial applications such as LCD TV, Set Top Box, Portable TV, etc.

Features



Wide Input Range: 4.2V-18V



High Efficiency PFM mode at light load



Capable of Delivering 3A



No External Compensation Needed



Current Mode Control



Thermal Shutdown and UVLO



Excellent Load and Line Transient Response



Available in SOT23-6 Package

Application



LCD TV



Set Top Box



Portable TV

Absolute Maximum Ratings

Parameter

Value

IN,SW,EN Voltage

–0.3V to 19V

BST Voltage

–0.3V to SW+6V

FB Voltage

–0.3V to 6V

Operating Temperature Range

–40°C to 85°C

Storage Temperature Range

–55°C to 150°C

Thermal Resistance



θ

JA

100°C/W



θ

JC

55°C/W

Lead Temperature (Soldering 10ssec)

260°C

Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions

for long periods may affect device reliability.