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UC3655 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 UC3655
部品説明 500mA SYNCHRONOUS STEP-DOWN DC/DC CONVERTERS
メーカ UTC
ロゴ UTC ロゴ 



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UC3655 Datasheet, UC3655 PDF,ピン配置, 機能
UNISONIC TECHNOLOGIES CO., LTD
UC3655
Preliminary
CMOS IC
500mA SYNCHRONOUS
STEP-DOWN DC/DC
CONVERTERS
4
„ DESCRIPTION
The UTC UC3655 is a synchronous-rectification type DC/DC
converters with a built-in 0.6P-channel driver transistor and 0.7
N-channel switching transistor, which designed to allow the use of
ceramic capacitors. Using only a coil and two capacitors connected
externally, the UC3655 enable a high efficiency, stable power supply
with an output current of 500mA to be configured. Its operating
voltage is 2.0V and the output voltage is programmable in a range
from 0.9V to 4.0V in increments of 0.1V (accuracy: ±2.0%) internally.
The oscillation frequency is 1.2MHz.
For operation mode, it is PWM control in the UTC UC3655, the
UTC UC3655 series is automatic PWM/PFM switching control,
allowing fast response, low ripple and high efficiency over the full
range of load.
Internal soft start and current control functions are built in it. All
circuits are shutdown to reduce current consumption to as low as
1.0μA or less during standby mode. With the built-in Under Voltage
Lock Out (U.V.L.O.) function, when input voltage becomes 1.4V or
lower the internal P channel driver transistor is forced OFF.
5
3
12
SOT-25
Lead-free: UC3655L
Halogen-free: UC3655G
„ FEATURES
* Very high efficiency 92%
* Low ripple rejection voltage 10mV
* Output current 500mA @VIN=3.0V, VOUT=1.8V
* Oscillation frequency is 1.2MHz
* With PWM / PFM automatic switching control
* Maximum duty ratio is 100%
* Ceramic capacitor available
„ ORDERING INFORMATION
Normal
UC3655-xx-AF5-R
Ordering Number
Lead Free
UC3655L-xx-AF5-R
Halogen Free
UC3655G-xx-AF5-R
Package
SOT-25
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2008 Unisonic Technologies Co., Ltd
1 of 9
QW-R502-280..a
Free Datasheet http://www.Datasheet4U.com

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