5.0A, 150kHz, Step-down Switching Regulator
FEATURES
3.3V, 5V, 12V, and adjustable output versions
Adjustable version output voltage range, 1.23V to 37V
± 3% max over line and load conditions
Guaranteed 5A output load current
Input voltage range up to 40V
Requires only 4 external components
150kHz ±15% fixed frequency internal oscillator
Excellent line and Load regulation specifications
Low power standby mode, I
Q
typically 80uA
Thermal shutdown and current limit protection
TO-263 PKG
LM1501A
TO-220 PKG
APPLICATION
Simple high-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
Ordering Information
Device(Marking)
LM1501AR-X.X
LM1501AT-X.X
X.X = Output Voltage = 3.3, 5.0, 12, ADJ
PKG
TO-263 5L
TO-220 5L
DESCRIPTION
The LM1501A series of regulators are monolithic integrated circuits that provide all the active functions for a
step-down switching regulator, capable of driving a 5A load with excellent line and load regulation. These
devices are available in fixed output voltages of 3.3V, 5V, 12V and an adjustable output version. Requiring a
minimum number of external components, these regulators are simple to use. The LM1501A series operates at
a switching frequency of 150kHz. Available in standard 5-lead TO-263 and TO-220 package.
Other features include a guaranteed ± 3% tolerance on output voltage under specified input voltage and
output load conditions, and ± 15% on the oscillator frequency. External shutdown is included, featuring typically
80uA standby current. Self protection features include a current limit for output switch and an over temperature
shutdown for complete protection under fault conditions. The over temperature shutdown level is about 145℃
with 5℃ hysteresis.
Absolute Maximum Ratings
(T
A
= 25
o
C)
(Note 1)
Characteristic
Maximum Input Supply Voltage
ON/OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Storage Temperature Range
Operating Temperature Range
ESD Susceptibility (Human Body Model)
Operating Supply Voltage
Symbol
V
I
V
IN
V
FB
V
O
P
D
T
stg
T
J
V
ESD
V
IN
Value
45
-0.3
≤
V
≤
+25
-0.3
≤
V
≤
+25
-1
Internally limited
-65 to +150
-40
≤
T
J
≤
+125
2
4.5 to 45
Unit
V
V
V
V
W
o
C
o
C
kV
V
Note 1. Absolute Maximum Rating indicate limits beyond which damage to device may occur. Operating Ratings indicate conditions for which
the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see
the Electrical Characteristics.
Mar. 2011 – Ver. 1.3
1
HTC
5.0A, 150kHz, Step-down Switching Regulator
Electrical Characteristics
LM1501A
Unless otherwise specified, T
J
=25℃ V
IN
= 12V for the 3.3V, 5V, and Adjustable version and V
IN
= 24V for the 12V
version. I
LOAD
= 500mA.
Characteristic
Symbol
Test Condition
LM1501A -ADJ
Min
Typ
73
73
80
90
Max
Unit
V
oUT
= 3V, I
LOAD
= 5A
V
IN
= 12V, I
LOAD
= 5A
V
IN
= 12V, I
LOAD
= 5A
V
IN
= 25V, I
LOAD
= 5A
4.75V
≤
V
IN
≤
40V
0.2A
≤
I
LOAD
≤
5A
7V
≤
V
IN
≤
40V
0.2A
≤
I
LOAD
≤
5A
15V
≤
V
IN
≤
40V
0.2A
≤
I
LOAD
≤
5A
4.5V
≤
V
IN
≤
40V
0.2A
≤
I
LOAD
≤
5A
V
OUT
programmed for 3V
3.20
4.85
11.64
Efficiency
η
LM1501A-3.3
LM1501A-5
LM1501A-12
LM1501A-3.3
%
3.3
5.0
12.0
3.40
5.15
12.36
V
Output Voltage
V
OUT
LM1501A-5
LM1501A-12
Feedback Voltage
Oscillator Frequency
Feedback
Current
Bias
V
FB
f
O
I
D
V
SAT
DC
LM1501A-ADJ
1.180
127
1.215
150
15
1.250
173
50
1.4
V
kHz
LM1501A-ADJ; V
FB
=1.215V
I
OUT
= 5A (Note 2,3)
(Note 3)
(Note 4)
Peak Current (Note 2,3)
Output = 0V
Output = -1V, V
IN
=40V
(Note 4)
ON/OFF pin = 5V(OFF), V
IN
= 40V
Saturation Voltage
Max Duty Cycle (ON)
Max Duty Cycle (OFF)
Current Limit
Output
Leakage Current
Quiescent Current
Standby
Quiescent Current
ON/OFF Pin
Logic Input
Threshold voltage
ON/OFF Pin
Logic Input current
V
%
100
0
6.5
50
2
4.5
80
1.3
30
10
200
I
CL
A
μA
mA
mA
μA
I
L
I
Q
I
STBY
V
IH
V
IL
I
H
I
L
Low(Regulator ON)
High (Regulator OFF)
V
LOGIC
= 2.5V (regulator OFF)
V
LOGIC
= 0.5V (regulator ON)
2.0
5
0.6
V
15
5
uA
Note 2. No elements connected to output pin
Note 3. Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 4. Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the A version, and 15V for the 12V version. To force the
output transistor switch OFF
Mar. 2011 – Ver. 1.3
3
HTC
Making friends through disassembly
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