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UC3550 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 UC3550
部品説明 PWM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER
メーカ UTC
ロゴ UTC ロゴ 



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UC3550 Datasheet, UC3550 PDF,ピン配置, 機能
UNISONIC TECHNOLOGIES CO., LTD
UC3550
CMOS IC
PWM CONTROLLED
PWM/PFM SWITCHABLE
STEP-UP DC-DC CONTROLLER
DESCRIPTION
The UTC UC3550 series is a compact, high efficiency, step-up
DC/DC controllers includes an error amplifier, oscillator, PWM
comparator, skip cycle comparator, voltage reference, soft-start,
and high speed lower ON-resistance driver for driving external
power devices (NMOS or NPN) ,Additionally, a CE (chip enable)
function that reduces power consumption during shut-down mode.
That typically operated from a single-or dual-cell battery packs. It
have a driver pin ,ext pin, for connecting to an external transistor
NMOS or NPN . a lower ON-resistance external transistor can
obtain larger output current. With only external components, this
series allow a simple means to accommodate high output current
applications.
The UTC UC3550 series goes automatically into skip switching
cycles under light load condition to maintain high efficiency.
www.DataSheet4U.com
FEATURES
* Input voltage range 0.9~8V
* Output voltage range 1.8~6V programmable in 0.1V with high
accuracy ± 2.5%
* High efficiency 88% typ.
* Low start-up voltage of 0.9V typical at IOUT = 1.0mA
* Oscillator frequency: 300kHz. 20%
* Chip enable pin with pull-up current source
* High output current up to 1000mA (VIN = 2.0V, VOUT =3.3V)
1
2
3
5
4
SOT-25
*Pb-free plating product number: UC3550L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
UC3550-xx-AF5-R
UC3550L-xx-AF5-R
Package
SOT-25
Packing
Tape Reel
UC3550L-xx-AF5-R
(1)Packing Type
(2)Package Type
(3)Voltage Code
(4)Lead Plating
(1) R: Tape Reel
(2) AF5: SOT-25
(3) xx: reference to Marking Information
(4) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
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QW-R502-082,A

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