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PDF UC3656 Data sheet ( Hoja de datos )
| Número de pieza | UC3656 | |
| Descripción | 800mA SYNCHRONOUS BUCK CONTROLLER | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
UC3656
Preliminary
1MHz,800mA SYNCHRONOUS
BUCK CONTROLLER
DESCRIPTION
The UTC UC3656 is a synchronous buck controller for a DC/DC
converter optimized for high-performance microprocessor applications.
It is configured with current mode for excellent line and load
transient response. At 1MHz operation frequency, the use of small
surface mount inductor and capacitor is enabled. The built-in
synchronous switch saves the use of an external Schottky diode and
increases efficiency.
The UTC UC3656 is a low-noise synchronous step-down DC/DC
converter that is ideally suited for systems requiring supplies from a
1-cell Li-ion battery or from a 3-cell to 4-cell NiCd, NiMH, or alkaline
battery.
The UTC UC3656 is generally applied in power supply for portable
devices and USB-based power system.
FEATURES
* High Efficiency (95%) Possible
* Input Voltage Range: 2.5V ~ 5.5V
* Schottky Diode is Saved
* Output Current: 800mA (@5V Input 3.3V Output)
* 1.0MHz Oscillation Frequency
* Internal ON/OFF
* 100% Duty Cycle Allows Low Dropout Operation
* Stand-by Current: 1μA (Max.)
ORDERING INFORMATION
Ordering Number
UC3656G-AF5-R
Package
SOT-25
Packing
Tape Reel
CMOS IC
MARKING
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
1 of 7
QW-R502-469.A
Free Datasheet http://www.Datasheet4U.com
1 page  
UC3656
Preliminary
TYPICAL APPLICATION CIRCUIT
VIN
5.0V
4.7μF
L1
4.7μF
VIN SW
SW
RUN
UC3656
47pF
FB
1M GND
Figure 1
VIN
5.0V
4.7μF
L1
4.7μF
VIN SW
SW 47pF
RUN
UC3656
FB
1M GND
Figure 2
CMOS IC
VOUT
1.8V/800mA
R2 10μF
R1
VOUT
3.3V/800mA
R2 10μF
R1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 7
QW-R502-469.A
Free Datasheet http://www.Datasheet4U.com
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet UC3656.PDF ] | |
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