FAN5354 Datasheet, PDF (4/14 Pages) Fairchild Semiconductor – 3MHz, 3A Synchronous Buck Regulator

Electrical Characteristics
Minimum and maximum values are at VIN=2.7V to 5.5V, TA=-40°C to +85°C, unless otherwise noted. Typical values are at
TA=25°C, VIN=5V.
Symbol Parameter
Conditions
Min. Typ. Max. Units
Power Supplies
IQ Quiescent Current
I SD Shutdown Supply Current
VUVLO Under-Voltage Lockout Threshold
VUVHYST Under-Voltage Lockout Hysteresis
Logic Pins
ILOAD=0, MODE=0
ILOAD=0, MODE=1 (Forced PWM)
EN=GND
VIN Rising
VIN Falling
270
μA
14
mA
0.1 3.0 μA
2.83 2.95 V
2.10 2.30 2.40 V
530
mV
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
Input Tied to GND or VIN
VPGOOD=0.4V
VPGOOD=VIN
TA=25°C
1.05
V
0.4 V
100
mV
0.01 1.00 μA
1 mA
0.01 1.00 μA
0.792 0.800 0.808 V
0.788 0.800 0.812 V
VREG VOUT DC Accuracy
At VOUT Pin W.R.T. Calculated Value,
ILOAD=500mA
1.6
+1.6 %
ΔV_OUT
ΔI_LOAD
Load Regulation
IOUT(DC)=1 to 3A
–0.03
%/A
ΔV_OUT
ΔV_IN
Line Regulation
2.7V ≤ VIN ≤ 5.5V, IOUT(DC)=1.5A
0.01
%/V
Transient Response
Power Switch and Protection
ILOAD Step 0.1A to 1.5A, tr=tf=100ns, VOUT=1.2V
+40
mV
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
Rising Threshold
Falling Threshold
60
mΩ
40
mΩ
3.75 4.55 5.50 A
150
°C
20
°C
6.2
V
5.50 5.85
V
Frequency Control
fSW Oscillator Frequency
2.7 3.0 3.3 MHz
fSYNC MODE Pin Synchronization Range External Square-Wave, 30% to 70% Duty Cycle 2.7 3.0 3.3 MHz
fPFM(MIN) Minimum PFM Frequency
TA = 25°C, VIN = 5.0V
17 26 36 kHz
Soft-Start
tSS
VSLEW
Regulator Enable to Regulated VOUT
Soft-Start VREF Slew Rate
RLOAD > 5Ω, to VOUT=1.2V
RLOAD > 5Ω, to VOUT=1.8V
210 250 μs
340 420 μs
10
V/ms
© 2009 Fairchild Semiconductor Corporation
FAN5354 • Rev. 1.0.4
4
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