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| FAN53541 Datasheet, PDF (5/15 Pages) Fairchild Semiconductor – 2.4 MHz, 5 A TinyBuck Synchronous Buck Regulator | |||
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Electrical Characteristics
Minimum and maximum values are at VIN=2.7 V to 5.5 V, and TA=-40°C to +85°C, unless otherwise noted. Typical values are
at TA=25°C, VIN=5 V, and VOUT=1.2 V.
Symbol
Power Supplies
Parameter
IQ Quiescent Current
I SD Shutdown Supply Current
VUVLO Under-Voltage Lockout Threshold
VUVHYST Under-Voltage Lockout Hysteresis
Logic Pins
VIH High-Level Input Voltage
VIL Low-Level Input Voltage
VLHYST Logic Input Hysteresis Voltage
IIN Input Bias Current
IOUTL PGOOD Pull-Down Current
IOUTH PGOOD HIGH Leakage Current
VOUT Regulation
VREF
Output Reference DC Accuracy,
Measured at FB Pin
ïVOUT
ïILOAD
Load Regulation
ïVOUT
ïVIN
Line Regulation
IREF FB Pin Leakage Current
ïVOUT Transient Response
Power Switch and Protection
RDS(ON)P P-Channel MOSFET On Resistance
RDS(ON)N N-Channel MOSFET On Resistance
ILIMPK P-MOS Peak Current Limit
TLIMIT Thermal Shutdown
THYST Thermal Shutdown Hysteresis
VSDWN Input OVP Shutdown
Frequency Control
fSW Oscillator Frequency
fMODE MODE Pin Synchronization Range
Soft-Start and Output Discharge
tSS
Regulator Enable to Regulated VOUT
(Rising PGOOD)
RDIS Output Discharge Resistance
Condition
Min. Typ. Max. Unit
ILOAD=0, MODE=0 (AUTO PFM/PWM)
ILOAD=0, MODE=1 (Forced PWM)
EN=GND
VIN Rising
VIN Falling
50
µA
30
mA
0.1 10 µA
2.67 2.80 V
2.1 2.3
V
365
mV
Input Tied to GND or 1 kΩ Resistor to VIN
VPGOOD=0.4 V
VPGOOD=VIN
1.05
1
140
0.01
0.01
V
0.4 V
mV
1.00 µA
mA
1.00 µA
TA=25°C, Forced PWM
TA=-40°C to 85°C, Forced PWM
AUTO PFM/PWM
MODE=VIN (Forced PWM)
0.792 0.800 0.808 V
0.787 0.800 0.813 V
0.784 0.800 0.824 V
â0.02
%/A
2.7 V ⤠VIN ⤠5.5 V, IOUT(DC)=1.5 A
FB=0.8 V
ILOAD Step 0.1 A to 1.5 A, tR=100 ns
-0.16
%/V
1
nA
-30
mV
Open Loop
Closed Loop
Rising Threshold
Falling Threshold
33
mΩ
28
mΩ
5.8 7.5 8.8 A
8
A
155
°C
20
°C
6.1
V
5.5 5.8
V
External Square-Wave, 30% to 70% Duty
Cycle
2.1 2.4 3.0 MHz
525 600 700 kHz
EN=0 V
1.2
ms
175
Ω
© 2013 Fairchild Semiconductor Corporation
FAN53541 ⢠Rev. 1.0.2
5
www.fairchildsemi.com
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