Data Sheet

© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN8303 • Rev. 1.2 5
FAN8303 — 2 A 23 V Non-Synchronous Step-Down DC/DC Regulator
Electrical Characteristics
V
IN
=12 V, T
A
= -40 to +85C, unless otherwise noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
V
FB
Feedback Voltage
25°C, 5V<V
IN
<23 V
0.58
0.60
0.62
V
R
ON_H
Upper Switch On Resistance
0.22

R
ON_L
Lower Switch On Resistance
4

I
LKG
Upper Switch Leakage Current
V
EN
=0 V,V
SW
=0 V
0
10
µA
I
PK
Peak Inductor Current
3.5
A
f
OSC
Oscillator Frequency
V
FB
>0.3 V
315
370
435
kHz
V
UVLO
Under-Voltage Lockout
Rising V
IN
4.2
4.6
5.0
V
f
SHORT
Short Circuit Frequency
V
FB
<0.3 V
25
45
55
kHz
D
MAX
Maximum Duty Cycle
90
%
T
ON_MIN
Minimum On Time
210
ns
V
EN
Enable Threshold
1.2
1.6
2.0
V
V
EN_H
Enable Threshold Hysteresis
150
mV
I
OFF
Supply Current (Shutdown)
V
EN
=0 V
10
40
µA
I
Q
Supply Current (Quiescent)
V
EN
>1.6 V; V
FB
=0.8 V
1.0
2.0
mA
G
CS
Current Sense Gain
2
A/V
G
EA
Error Amplifier Transconductance
380
µA/V
A
VEA
Error Amplifier Voltage Gain
400
V/V
I
SS
Soft-Start Current
6
µA
TSD
Thermal Shutdown Temperature
155
°C