ACE721A
Technology
1.2MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
Description
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
• 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
Symbol
VIN
Value
Unit
V
Input Voltage
-0.3 to 6
Feedback Voltage
EN Pin Voltage
VFB
-0.3 to VIN+0.3
-0.3 to VIN+0.3
-0.3 to VIN+0.3
V
VEN
V
SW Pin Voltage
VSW
θJA
TJ
V
Thermal Resistance
Operating Junction Temperature
Storage Temperature
SOT-23-5
125
250 ℃/W
℃
℃
TSTG
-65 to 150
VER 1.3
1
ACE [ ACE TECHNOLOGY CO., LTD. ]
