WIDE INPUT 2A STEP DOWN CONVERTER
FSP3126
ABSOLUTE MAXIMUM RATINGS
Parameter
Value
Unit
IN Supply Voltage
-0.3 to 25
V
SW Voltage
-1 to V
IN
+ 1
V
BS Voltage
V
SW
– 0.3 to V
SW
+ 8
V
EN, FB, COMP Voltage
-0.3 to 6
V
Continuous SW Current
Internally limited
A
Junction to Ambient Thermal Resistance (θ
JA
)
105
°C/W
Maximum Power Dissipation
0.76
W
Operating Junction Temperature
-40 to 150
°C
Storage Temperature
-55 to 150
°C
Lead Temperature (Soldering, 10 sec)
300
°C
(Note: Exceeding these limits may damage the device. Exposure to absolute maximum rating conditions for long
periods may affect device reliability.)
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, TA= 25°C unless otherwise specified.)
Parameter
Input Voltage
Feedback Voltage
High-Side Switch On
Resistance
Low-Side Switch On
Resistance
SW Leakage
Current Limit
COMP to Current Limit
Transconductance
Error Amplifier
Transconductance
Error Amplifier DC Gain
Switching Frequency
Short Circuit Switching
Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Enable Threshold Voltage
Enable Pull Up Current
Supply Current in Shutdown
IC Supply Current in
Operation
Thermal Shutdown
Temperature
Symbol
V
IN
V
FB
R
ONH
R
ONL
V
EN
= 0
I
LIMT
G
COMP
G
EA
A
VEA
f
SW
V
FB
= 0
D
MAX
V
FB
= 1.1V
V
FB
= 1.4V
Hysteresis = 0.1V
Pin pulled up to 4.5V typically when
left unconnected
V
EN
= 0
V
EN
= 3V, V
FB
= 1.4V
Hysteresis = 10°C
∆I
COMP
= ±10µA
350
2.4
Test Conditions
V
OUT
= 5V, I
LOAD
= 0A to 1A
4.75V
≤
V
IN
≤
20V, V
COMP
= 1.5V
Min.
7
1.267
Typ.
1.293
0.20
4.7
0
2.85
1.8
550
4000
410
50
90
0.7
1
2
8
0.7
160
20
0
1.3
470
10
Max.
20
1.319
Unit
V
V
Ω
Ω
µA
A
A/V
µA/V
V/V
kHz
kHz
%
%
V
µA
µA
mA
°C
2/9
2007-5-28
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