150KHZ 3A PWM BUCK DC/DC CONVERTER
FSP3122
ELECTRICAL CHARACTERISTICS (ALL OUTPUT VOLTAGE VERSIONS)
Unless otherwise specified, VIN=12V for 3.3V,5V, adjustable version and VIN=24V for the 12V version. ILOAD=0.5A
Symbol
Paramrter
Conditions
VFB=1.3V(Adjustable
version only)
Min.
Typ.
Max.
50
100
173
173
Unit
IB
Feedback bias current
40
nA
127
110
150
FOSC
VSAT
DC
Oscillator frequency
Saturation voltage
KHz
V
IOUT=3A
no outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current
1.16
1.4
Max.Duty Cycle(ON)
Min.Duty Cycle(OFF)
100
%
0
ICL
Current limit
no outside circuit
VFB=0V force driver on
no outside circuit
VFB=12V force driver off
VIN=40V
VFB=12V force driver off
ON/OFF Pin=5V
VIN=40V
3.6
6.9
50
A
Output
Output=0
µA
IL
leakage
current
Output=-1
5
7.8
30
10
mA
mA
IQ
Quiescent Current
Standby Quiesient
Current
ISTBY
85
200
0.6
µA
VIL
VIH
IH
Low(regultaor ON)
High(regultaor OFF)
ON/OFF pin logic input
threshold voltage
1.4
V
2.0
ON/OFF pin logic input
current
ON/OFF pin input
current
VLOGIC=2.5V(OFF)
6
15
5
µA
IL
VLOGIC=0.5V(ON)
TO252-5L
0.02
10
2.5
3.5
Junction
to case
θJC
Thermal Resistence
℃/W
℃/W
TO220-5L
TO263-5L
Thermal Resistence
With copper area of
approximately 3 in2
TO252-5L
30
Junction
to ambient
θJA
TO220-5L
TO263-5L
28
30
ELECTRICAL CHARACTERISTICS (CONTINUED)
Symbol
Parameter
Conditions
Typ.
Limit
Unit
4.5V≤VIN≤40V
0.2A≤ILOAD≤3A
VOUT programmed for
3V
V
VMIN
VMAX
1.193/1.18
1.267/1.28
VFB
Output Feedback
1.23
FSP3122-ADJ
η
VOUT
η
Efficiency
Output voltage
Efficiency
VIN =12V, ILOAD =3A
72
3.3
72
5
%
V
VMIN
VMAX
%
5V≤VIN≤40V
0.2A≤ILOAD≤3A
3.168/3.135
3.432/3.465
FSP3122-3.3V
FSP3122-5V
FSP3122-12V
VIN =12V, ILOAD =3A
V
7V≤VIN≤40V
0.2A≤ILOAD≤3A
4.8/4.75
5.2/5.25
VOUT
η
VOUT
η
Output voltage
Efficiency
VMIN
VMAX
%
VIN =12V, ILOAD =3A
79
12
90
V
15V≤VIN≤40V
0.2A≤ILOAD≤3A
11.52/11.4
12.48/12.6
Output voltage
VMIN
VMAX
%
Efficiency
VIN =15V, ILOAD =3A
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
2007-6-12
3/10
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