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UC3552L-S08-R Datasheet(PDF) 4 Page - Unisonic Technologies

Part # UC3552L-S08-R
Description  PWM DC-DC CONVERTER
PDF  7 Pages
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3552L-S08-R Datasheet(HTML) 4 Page - Unisonic Technologies

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UC3552
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
4 of 7
www.unisonic.com.tw
QW-R502-134.B
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
SW to GND
-0.3 ~ +14
V
IN, SHDN , VDD , FREQ to GND
-0.3 ~ +6
V
SS, EO to GND
-1.3V ~ (VDD+0.3V)
V
RMS SW Pin Current
ISW
1.2
A
Continuous Power Dissipation (TC = 70°C)
SOP-8
PD
350
mW
MSOP-8
300
mW
Junction Temperature
TJ
+125
°C
Operating Temperature
TOPR
-20 ~ +85
°C
Storage Temperature
TSTG
-45 ~ +125
°C
Note: 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.
ELECTRICAL CHARACTERISTICS
TC = +25°C, VDD =SHDN = 3V, FREQ = GND, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Supply Voltage
VDD
2.6
5.5
V
VDD Under Voltage Lockout
UVLO
When VDD is rising, typical hysteresis
is 40mV; SW remains off below this
level
2.25
2.38
2.52
V
Quiescent Current
IDD
VDD = 1.3V, not switching
0.21
0.35
mA
VDD = 1.0V, switching
1.2
5.0
Shutdown Current
ISC
SHDN = GND
0.1
10.0
µA
ERROR AMPLIFIER
Feedback Voltage
VIN
Level to produce VEO = 1.24V
1.22
1.240 1.258
V
VDD Input Bias Current
II(BIAS)
VIN= 1.24V
0
40
nA
Feedback-Voltage Line
Regulation
Level to produce VEO = 1.24V,
2.6V < VDD < 5.5V
0.05
0.15
%/V
Transconductance
gm
ΔI = 5µA
70
105
240
µA/V
Voltage Gain
GV
1500
V/V
OSCILLATOR
Frequency
fOSC
FREQ = GND
540
640
740
kHZ
FREQ = VDD
1100
1320
1600
Maximum Duty Cycle
tDUTY
FREQ = GND
79
85
92
%
FREQ = VDD
85
N-CHANNEL SWITCH
Current Limit
ILIMIT
VDD = 1V, Duty Cycle = 65%
1.2
1.6
2.3
A
On-Resistance
RON
ISW = 1.2A
0.23
0.50
Ω
Leakage Current
ILEAK
VSW = 12V
0.01
20.00
µA
SOFT-START
Reset Switch Resistance
300
Ω
Charge Current
VSS = 1.2V
1.5
4.0
7.0
µA
CONTROL INPUTS
Input Low Voltage
VIL
SHDN , FREQ; VDD = 2.6V ~ 5.5V
0.3VDD
V
Input High Voltage
VIH
SHDN , FREQ; VDD = 2.6V ~ 5.5V
0.7VDD
V
Hysteresis
SHDN , FREQ
0.1VDD
V
FREQ Pull-Down Current
IFREQ
1.8
5.0
9.0
µA
SHDN Input Current
ISHDN
0.001 1.000
µA



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