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PDF UC3655 Data sheet ( Hoja de datos )
| Número de pieza | UC3655 | |
| Descripción | 500mA SYNCHRONOUS STEP-DOWN DC/DC CONVERTERS | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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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
1 page  
UC3655
Preliminary
CMOS IC
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 "L" Current
LX (PIN 5)
LX SW "H" ON Resistance
LX SW "L" ON Resistance
LX SW "H" Leak Current
LX SW "L" Leak Current
SYMBOL
ISTN-BY
IPFM
ILIM
η
TEST CONDITIONS
VIN=5.0V, CE=0V, VOUT=VOUT*1.1
CE=VIN, IOUT=1mA
VIN=CE=5.0V, VOUT=0V
CE=VIN=4.5V, IOUT=100mA
MIN
100
600
TYP
0
140
700
92
MAX
1.0
180
UNIT
µA
mA
mA
%
fOSC
DMAX
DMIN
TSS
Tlat
IOUT=100mA
CE=VIN, VOUT=0V
CE=VOUT=VIN
IOUT=1mA
VIN=CE=5.0V (Note 3)
1020
100
0.5
1
1200
1.0
1380
0
3.0
20
kHz
%
%
ms
ms
VCEH
VCEL
ICEH
ICEL
VIN=CE=5.5V, VOUT=0V
VIN=5.5V, CE=0V, VOUT=0V
0.9
VSS
-0.1
-0.1
VIN V
0.3 V
0.1 µA
0.1 µA
RLXH
RLXL
ILEAKH
ILEAKL
CE=0.5VIN, VOUT=0V, ILX=100mA
CE=0.5VIN, ILX=100mA
VIN=VOUT=5.0V, CE=0V, LX=0V
(Note 2)
VIN=VOUT=5.0V, CE=0V, LX=5.0V
0.5
0.6
0.01 1.0
0.01 1.0
Ω
Ω
µA
µA
UC3655-33 (VIN=5.0V, VOUT=3.3V)
PARAMETER
SYMBOL
Operating Voltage Range
Output Voltage
U.V.L.O. Voltage
Output Voltage Temperature
Characteristics
VIN
VOUT
VUVLO
ΔVOUT
VOUT*ΔTOPR
Maximum Output Current
Supply Current
Stand-by Current
PFM Switch Current
Current Limit
Efficiency (Note 1)
IOUT(MAX)
IDD
ISTN-BY
IPFM
ILIM
η
OSCILLATOR
Oscillation Frequency
Maximum Duty Ratio
Minimum Duty Ratio
Soft-Start Time
Latch Time
fOSC
DMAX
DMIN
TSS
Tlat
CE (PIN 3)
CE "H" Voltage
CE "L" Voltage
CE "H" Current
CE "L" Current
VCEH
VCEL
ICEH
ICEL
LX (PIN 5)
LX SW "H" ON Resistance
LX SW "L" ON Resistance
RLXH
RLXL
LX SW "H" Leak Current
ILEAKH
LX SW "L" Leak Current
ILEAKL
TEST CONDITIONS
CE=VIN, IOUT=30mA
CE=VIN, VOUT=0V, LX=L
IOUT=30mA, -40℃≤TOPR≤85℃
VIN=4.5V
VIN=CE=5.0V, VOUT=VOUT*1.1
VIN=5.0V, CE=0V, VOUT=VOUT*1.1
CE=VIN, IOUT=1mA
VIN=CE=5.0V, VOUT=0V
CE=VIN=4.5V, IOUT=100mA
IOUT=100mA
CE=VIN, VOUT=0V
CE=VOUT=VIN
IOUT=1mA
VIN=CE=5.0V (Note 3)
VIN=CE=5.5V, VOUT=0V
VIN=5.5V, CE=0V, VOUT=0V
CE=0.50VIN, VOUT=0V, ILX=100mA
CE=0.5VIN, ILX=100mA
VIN=VOUT=5.0V, CE=0V, LX=0V
(Note 2)
VIN=VOUT=5.0V, CE=0V, LX=5.0V
MIN
2.0
3.234
1.0
500
100
600
1020
100
0.5
1
0.9
VSS
-0.1
-0.1
TYP
3.300
1.40
±100
75
0
140
700
92
1200
1.0
0.5
0.6
0.01
0.01
MAX
6.0
3.366
1.78
UNIT
V
V
V
ppm/℃
mA
120 µA
1.0 µA
180 mA
mA
%
1380
0
3.0
20
kHz
%
%
ms
ms
VIN V
0.3 V
0.1 µA
0.1 µA
Ω
Ω
1.0 µA
1.0 µA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 9
QW-R502-280..a
Free Datasheet http://www.Datasheet4U.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet UC3655.PDF ] | |
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