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Electrical Specifications
Unless otherwise noted, V IN = 2.5 to 5.5V, EN = V IN . T A = -40°C to +85°C, using circuit of Figure 1. Typical values are at
3.6V IN , T A = 25°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
Power Supplies
I Q
Quiescent Current
35
55
μA
I SD
V UVLO
Shutdown Supply Current
Under-Voltage Lockout Threshold
V IN = 3.6V, EN = GND
Rising V IN
0.1
2.15
2.0
2.25
μA
V
V UVHYST
V ENH
V ENL
V EN_HYS
Under-Voltage Lockout Hysteresis
Enable HIGH-Level Input Voltage
Enable LOW-Level Input Voltage
Enable Logic Input Hysteresis
1.05
150
100
0.4
mV
V
V
mV
I EN
Enable Input Leakage Current
EN = V IN or GND
0.01
1.00
μA
Oscillator
f OSC
Oscillator Frequency (3)
PWM Mode
5.4
6.0
6.6
MHz
Regulation
1.82V
1.50V
I LOAD = 0 to 600mA
PWM Mode
I LOAD = 0 to 600mA
PWM Mode
1.784
1.784
1.470
1.470
1.820
1.820
1.500
1.500
1.890
1.856
1.560
1.530
V O
Output Voltage Accuracy
1.30V
I LOAD = 0 to 600mA
PWM Mode
1.274
1.274
1.300
1.300
1.352
1.326
V
1.23V
1.00V
I LOAD = 0 to 600mA
PWM Mode
I LOAD = 0 to 600mA
PWM Mode
1.207
1.207
0.975
0.975
1.233
1.233
1.000
1.000
1.283
1.260
1.050
1.025
t SS
Soft-Start Time
Rising EN to V OUT Regulation
180
300
μs
Protection
I LIM
T TSD
T HYS
Peak Input Current Limit
Thermal Shutdown
Thermal Shutdown Hysteresis
850
1050
+150
+15
1250
mA
°C
°C
Note:
3. PWM frequency may be lower than specified when limited by t ON-min (minimum on-time) or t OFF_min (minimum off-time), at
duty cycle extremes, but output regulation is maintained.
? 2009 Fairchild Semiconductor Corporation
FAN4603 ? Rev. 1.0.1
4
www.fairchildsemi.com
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