SAMHOP Microelectronics Corp.
150KHz, 3A PWM Buck Switching Regulator
Absolute Maximum Ratings
Symbol
V
CC
V
SD
V
FB
V
OUT
P
D
T
ST
T
OP
V
OP
Parameter
Supply Voltage
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
Rating
+35
-0.3 to +25
-0.3 to +25
-1
Internally limited
-65 to +150
-40 to +125
+4.5 to +25
SM8303
Unit
V
V
V
V
W
o
o
C
C
V
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, V
IN
=12V for 3.3V, 5V, adjustable version and V
IN
=24V for the 12V version. I
LOAD
= 0.3A
Symbol
I
B
F
OSC
V
SAT
DC
I
CL
Parameter
Feedback bias current
oscillator frequency
saturation voltage
Max. Duty Cycle(ON)
Min. Duty cycle(OFF)
current limit
Output = 0V Output
leakage
Output= -1V current
Quiescent Current
Standby Quiescent
Current
ON/OFF pin logic input
threshold voltage
Conditions
V
FB
=1.3V
(Adjustable version only)
Min.
Typ.
40
Max.
60
100
173
173
1.4
1.5
Unit
nA
Khz
V
%
127
110
I
OUT
=3A
no outside circuit
V
FB
=0V force driver on
V
FB
=0V force driver on
V
FB
=12V force driver off
peak current
no outside circuit
V
FB
=0 force driver on
no outside circuit
V
FB
=12 force driver off
V
IN
=32V
V
FB
=12 force driver off
ON/OFF pin=5V
V
IN
=24V
Low (regulator ON)
High (regulator OFF)
-
2.0
150
1.3
100
0
3.6
4.5
5.5
6.5
200
A
uA
mA
mA
uA
I
L
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
Θ
JC
Θ
JA
2
5
150
60
10
250
300
0.6
1.3
15
0.02
2.5
3.5
28
23
-
25
5
o
V
ON/OFF pin logic
V
LOGIC
=2.5V (OFF)
input current
ON/OFF pin input current V
LOGIC
=0.5V (ON)
Thermal Resistance
Thermal Resistance
With copper area of
approximately 3 in
2
TO220-5L
TO263-5L
TO220-5L
TO263-5L
Junction to
case
Junction to
ambient
3
uA
C/W
C/W
o
V1.0 May 17 ,2007
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
