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UC3551 Datasheet(PDF) 4 Page - Unisonic Technologies

Part No. UC3551
Description  ADVANCED PWM STEP-UP DC-DC CONVERTER
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
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UC3551 Datasheet(HTML) 4 Page - Unisonic Technologies

   
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UC3551
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
4 of 6
www.unisonic.com.tw
QW-R502-555.a
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
− 0.3 ~ 7
V
LX Pin Switch Voltage
VLX
− 0.3 ~ (VDD + 0.8)
V
Other I/O Pin Voltages
− 0.3 ~ (VDD + 0.3)
V
LX Pin Switch Current
ILX
2.5
A
EXT Pin Driver Current
IEXT
200
mA
Operating Junction Temperature
TOPR
125
°C
Storage Temperature
TSTG
-65~+150
°C
Notes: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
Junction to Case
θJC
145
°C/W
ELECTRICAL CHARACTERISTICS
(TA = 25°C,VIN = 1.5V, VDD= 3.3V, Load Current = 0, unless otherwise specified)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
Start-UP Voltage
VST
IL = 1mA
0.98
1.05
V
Operating VDD Range
VDD
VDD pin voltage
2
6.5
(Note )
V
No Load Current I (VIN)
INO LOAD
VIN = 1.5V, VOUT = 3.3V
75
μA
Switch-off Current I (VDD)
ISWITCH OFF
VIN = 6V
17
μA
Shutdown Current I (VIN)
IOFF
CE Pin = 0V, VIN = 4.5V
0.01
1
μA
Feedback Reference Voltage
VREF
Close Loop, VDD = 3.3V
1.225
1.25
1.275
V
Switching Frequency
FS
VDD = 3.3V
450
KHz
Maximum Duty
DMAX
VDD = 3.3V
95
%
LX ON Resistance
VDD = 3.3V
0.3
Current Limit Setting
ILIMIT
VDD = 3.3V
2
A
EXT ON Resistance to VDD
VDD = 3.3V
5
EXT ON Resistance to GND
VDD = 3.3V
5
Line Regulation
∆VLINE
VIN = 1.5 ~ 2.5V, IL = 1mA
10
mV/V
Load Regulation
∆VLOAD
VIN = 2.5V, IL = 1 ~ 100mA
0.25
mV/mA
CE Pin Trip Level
VDD = 3.3V
0.4
0.8
1.2
V
Temperature Stability for Vout
Ts
50
ppm/°C
Thermal Shutdown
TSD
165
°C
Thermal Shutdown Hysterises
∆TSD
10
°C
Note: The CE pin shall be tied to VDD pin and inhibit to act the ON/OFF state whenever the VDD pin voltage may
reach to 5.5V or above.


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