UC3655 PDF даташит
Спецификация UC3655 изготовлена «Unisonic Technologies» и имеет функцию, называемую «500mA SYNCHRONOUS STEP-DOWN DC/DC CONVERTERS». |
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Детали детали
Номер произв | UC3655 |
Описание | 500mA SYNCHRONOUS STEP-DOWN DC/DC CONVERTERS |
Производители | Unisonic Technologies |
логотип |
9 Pages
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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 0.6Ω 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.
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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UC3655
Preliminary
MARKING
PACKAGE VOLTAGE CODE
SOT-25
12:1.2V
28:2.8V
33:3.3V
38:3.8V
MARKING
321
Voltage Code
UH XX
45
PIN DESCRIPTION
PIN NO
1
2
3
4
5
PIN NAME
VIN
VSS
CE / MODE
VOUT
Lx
Power Input Voltage
Ground
Switch Pin For Chip Enable Mode
Output Voltage Sense Pin
Output Of Switching
DESCRIPTION
CMOS IC
L: Lead Free
L: Halogen Free
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 9
QW-R502-280..a
Free Datasheet http://www.Datasheet4U.com
No Preview Available ! |
UC3655
BLOCK DIAGRAM
Preliminary
VOUT
VIN
Phase Compensation
Current Limit & Feedback
Vref
with
Soft
Start,
CE
Error
Amp.
PWM/PFM
Selector
PWM
Com-
parator
U.V.L.O Comp.
U.V.L.O.
Logic
Buffer
Driver
Ramp Wave
Generator,
OSC
CE/MODE
Control Logic
P ch
Driver
Tr.
N ch
SW
Tr.
CMOS IC
LX
CE/
MODE
VSS
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 9
QW-R502-280..a
Free Datasheet http://www.Datasheet4U.com
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