ACE721A
Technology
Description
1.2MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
The ACE721A is a 1.2MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 800mA load with high efficiency, excellent line and load regulation. The
device integrates a main switch and a synchronous switch without an external Schottky diode. It is ideal
for powering portable equipment that runs from a single Li-ion battery.
A standard series of inductors are available from several different manufactures optimized for use with
the ACE721A. This feature greatly simplifies the design of switch-mode power supplies.
This IC is available in SOT-23-5 packages.
Features
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High Efficiency: up to 95%
Output Current: 800mA
Input Voltage Range: 2.5V to 5.5V
Fixed 1.2MHz Frequency
Current Mode Control
100% Duty Cycle in Dropout
Built-in Short Circuit Protection
Built-in Thermal Shutdown Function
Built-in Current Limit Function
Shutdown Current: <1μA
Application
GPS
WiFi Card
Portable Media Player
Digital Still and Video Cameras
Absolute Maximum Ratings
Parameter
Input Voltage
Feedback Voltage
EN Pin Voltage
SW Pin Voltage
Thermal Resistance
Operating Junction Temperature
Storage Temperature
Symbol
V
IN
V
FB
V
EN
V
SW
θ
JA
T
J
T
STG
Value
-0.3 to 6
-0.3 to V
IN
+0.3
-0.3 to V
IN
+0.3
-0.3 to V
IN
+0.3
SOT-23-5
125
-65 to 150
250
Unit
V
V
V
V
℃/W
℃
℃
VER 1.3
1
ACE [ ACE TECHNOLOGY CO., LTD. ]
