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PDF ACE721A Data sheet ( Hoja de datos )
| Número de pieza | ACE721A | |
| Descripción | 1.2MHz 800mA SYNCHRONOUS DC-DC BUCK CONVERTER | |
| Fabricantes | ACE Technology | |
| Logotipo |  |
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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
Input Voltage
Feedback Voltage
EN Pin Voltage
SW Pin Voltage
Thermal Resistance
Operating Junction Temperature
Storage Temperature
Symbol
VIN
VFB
VEN
VSW
θJA
TJ
TSTG
Value
Unit
-0.3 to 6
V
-0.3 to VIN+0.3
-0.3 to VIN+0.3
V
V
-0.3 to VIN+0.3
V
SOT-23-5 250 ℃/W
125 ℃
-65 to 150
℃
VER 1.3 1
1 page  
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ACE721A
Technology
1.2MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER
400ns/div
Figure 5. Light Load Operation
(VIN=3.6V, VOUT=1.8V, IOUT=0mA)
400ns/div
Figure 6. Heavy Load Operation
(VIN=3.6V, VOUT=1.8V, IOUT=800mA)
200μs/div
Figure 7. Load Transient
(VIN=3.6V, VOUT=1.8V, IOUT=0mA to 800mA)
400μs/div
Figure 8. Start up from Shutdown
(VIN=3.6V, VOUT=1.8V, RLOAD=2.5Ω)
10μs/div
Figure 9. Short Circuit Protection
(VIN=3.6V, VOUT=1.8V, no load)
40μs/div
Figure 10. Short Circuit Recovery
(VIN=3.6V, VOUT=1.8V, no load)
VER 1.3 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ACE721A.PDF ] | |
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