UC3655G-XX-AF5-R UTC [Unisonic Technologies], UC3655G-XX-AF5-R Datasheet

UC3655G-XX-AF5-R

Manufacturer Part Number

UC3655G-XX-AF5-R

Description

500mA SYNCHRONOUS STEP-DOWN DC/DC CONVERTERS

Manufacturer

UTC [Unisonic Technologies]

Datasheet

1.UC3655G-XX-AF5-R.pdf (9 pages)

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UC3655

500mA SYNCHRONOUS

STEP-DOWN DC/DC CONVERTERS

converters with a built-in 0.6Ω P-channel driver transistor and 0.7Ω

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.

UC3655 series is automatic PWM/PFM switching control, allowing fast

response, low ripple and high efficiency over the full range of load.

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.

* Very High Efficiency 92%

* Low Ripple Rejection Voltage 10mV

* Output Current 500mA @V

* Oscillation Frequency is 1.2MHz

* With PWM / PFM Automatic Switching Control

* Maximum Duty Ratio is 100%

* Ceramic Capacitor Available

www.unisonic.com.tw

DESCRIPTION

The UTC UC3655 is a synchronous-rectification type DC/DC

For operation mode, it is PWM control in the UTC UC3655, the UTC

Internal soft start and current control functions are built in it. All

FEATURES

ORDERING INFORMATION

UC3655G-xx-AF5-R

Ordering Number

UNISONIC TECHNOLOGIES CO., LTD

=3.0V, V

OUT

=1.8V

Package

SOT-25

Preliminary

Tape Reel

Packing

CMOS IC

QW-R502-280.b

1 of 9

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UC3655G-XX-AF5-R Summary of contents

Page 1

... Low Ripple Rejection Voltage 10mV * Output Current 500mA @V =3.0V Oscillation Frequency is 1.2MHz * With PWM / PFM Automatic Switching Control * Maximum Duty Ratio is 100% * Ceramic Capacitor Available ORDERING INFORMATION Ordering Number UC3655G-xx-AF5-R www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd Preliminary =1.8V OUT Package Packing SOT-25 Tape Reel ...

Page 2

UC3655 MARKING PACKAGE VOLTAGE CODE SOT- PIN DESCRIPTION PIN NO PIN NAME ...

Page 3

UC3655 BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Preliminary CMOS QW-R502-280.b ...

Page 4

UC3655 ABSOLUTE MAXIMUM RATING PARAMETER V Pin Voltage IN LX Input/Output Pins V CE/MODE Lx Pin Current Power Dissipation Operating Temperature Storage Temperature Range Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute ...

Page 5

UC3655 ELECTRICAL CHARACTERISTICS(Cont.) PARAMETER Stand-by Current PFM Switch Current Current Limit Efficiency (Note 1) OSCILLATOR Oscillation Frequency Maximum Duty Ratio Minimum Duty Ratio Soft-Start Time Latch Time CE (PIN 3) CE "H" Voltage CE "L" Voltage CE "H" Current CE ...

Page 6

UC3655 ELECTRICAL CHARACTERISTICS(Cont.) UC3655-38 (V =5.0V, V =3.8V) IN OUT PARAMETER Operating Voltage Range Output Voltage U.V.L.O. Voltage Output Voltage Temperature Characteristics Maximum Output Current Supply Current Stand-by Current PFM Switch Current Current Limit Efficiency (Note 1) OSCILLATOR Oscillation Frequency ...

Page 7

UC3655 OPERATIONAL EXPLANATION CE / MODE Pin Function When a low level signal is input to the CE/MODE pin the operation of the UC3655 series will enter into the shut down mode. In this mode, the current consumption occurs only ...

Page 8

UC3655 TEST CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Preliminary C 4.7µF (Ceramic 10µF (Ceramic CMOS IC 3.3µ QW-R502-280.b ...

Page 9

UC3655 TYPICAL APPLICATION CIRCUIT V CE/MODE UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications ...

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