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UC3550 датащи(PDF) 1 Page - Unisonic Technologies

номер детали UC3550
подробное описание детали  PWM CONTROLLED竊똏WM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER
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производитель  UTC [Unisonic Technologies]
домашняя страница  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3550 датащи(HTML) 1 Page - Unisonic Technologies

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UNISONIC TECHNOLOGIES CO., LTD
UC3550
CMOS IC
www.unisonic.com.tw
1 of 10
Copyright © 2005 Unisonic Technologies Co., Ltd
QW-R502-082,A
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.
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)
SOT-25
4
5
3
2
1
*Pb-free plating product number: UC3550L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
Package
Packing
UC3550-xx-AF5-R
UC3550L-xx-AF5-R
SOT-25
Tape Reel
UC3550L-xx-AF5-R
(1)Packing Type
(2)Package Type
(4)Lead Plating
(1) R: Tape Reel
(2) AF5: SOT-25
(4) L: Lead Free Plating, Blank: Pb/Sn
(3) xx: reference to Marking Information
(3)Voltage Code


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