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Electrical Characteristics
Minimum and maximum values are at V IN =2.7 V to 5.5 V, and T A =-40°C to +85°C, unless otherwise noted. Typical values are
at T A =25°C, V IN =5 V, and V OUT =1.2 V.
Symbol
Parameter
Condition
Min.
Typ.
Max. Unit
Power Supplies
I Q
Quiescent Current
I LOAD =0, MODE=0 (AUTO PFM/PWM)
I LOAD =0, MODE=1 (Forced PWM)
50
30
μA
mA
I SD
Shutdown Supply Current
EN=GND
0.1
10.0
μA
V UVLO
Under-Voltage Lockout Threshold
V IN Rising
V IN Falling
2.1
2.67
2.3
2.80
V
V
V UVHYST
Under-Voltage Lockout Hysteresis
365
mV
Logic Pins
V IH
V IL
V LHYST
High-Level Input Voltage
Low-Level Input Voltage
Logic Input Hysteresis Voltage
1.05
140
0.4
V
V
mV
I IN
I OUTL
I OUTH
Input Bias Current
PGOOD Pull-Down Current
PGOOD HIGH Leakage Current
Input Tied to GND or 1 k ? Resistor to VIN
V PGOOD =0.4 V
V PGOOD =V IN
1
0.01
0.01
1.00
1.00
μA
mA
μA
V OUT Regulation
V REF
? V OUT
? I LOAD
? V OUT
? V IN
I REF
? V OUT
Output Reference DC Accuracy,
Measured at FB Pin
Load Regulation
Line Regulation
FB Pin Leakage Current
Transient Response
T A =25°C, Forced PWM
T A =-40°C to 85°C, Forced PWM
AUTO PFM/PWM
MODE=V IN (Forced PWM)
2.7 V ≤ V IN ≤ 5.5 V, I OUT(DC) =1.5 A
FB=0.8 V
I LOAD Step 0.1 A to 1.5 A, t R =100 ns
0.792
0.787
0.784
0.800
0.800
0.800
–0.02
-0.16
1
-30
0.808
0.813
0.824
V
V
V
%/A
%/V
nA
mV
Power Switch and Protection
R DS(ON)P P-Channel MOSFET On Resistance
R DS(ON)N N-Channel MOSFET On Resistance
33
28
m ?
m ?
I LIMPK
P-MOS Peak Current Limit
Open Loop
Closed Loop
5.8
7.5
8
8.8
A
A
T LIMIT
T HYST
Thermal Shutdown
Thermal Shutdown Hysteresis
155
20
°C
°C
V SDWN
Input OVP Shutdown
Rising Threshold
Falling Threshold
5.5
6.1
5.8
V
V
Frequency Control
f SW
Oscillator Frequency
2.1
2.4
3.0
MHz
f MODE
MODE Pin Synchronization Range
External Square-Wave, 30% to 70% Duty
Cycle
525
600
700
kHz
Soft-Start and Output Discharge
t SS
Regulator Enable to Regulated V OUT
(Rising PGOOD)
1.2
ms
R DIS
Output Discharge Resistance
EN=0 V
175
?
? 2011 Fairchild Semiconductor Corporation
FAN53540 ? Rev. 1.0.3
5
www.fairchildsemi.com
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