5.0A, 300kHz, 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
300kHz ±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
LM1501B
TO-220 PKG
APPLICATION
Simple high-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
Ordering Information
Device
LM1501BR-X.X
LM1501BT-X.X
X.X = Output Voltage = 3.3, 5.0, 12, ADJ
PKG
TO-263 5L
TO-220 5L
DESCRIPTION
The LM1501B 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 LM1501B series operates at
a switching frequency of 300kHz. Available in standard 5-lead TO-263 and TO-220 packages.
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 the 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. 1.2
1
HTC
5.0A, 300kHz, Step-down Switching Regulator
Electrical Characteristics
LM1501B
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
Symb
ol
Test Condition
LM1501B -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
LM1501B-3.3
LM1501B-5
LM1501B-12
LM1501B-3.3
%
3.3
5
12
3.40
5.15
12.36
V
Output Voltage
V
OUT
LM1501B-5
LM1501B-12
Feedback Voltage
Oscillator Frequency
Feedback Bias Current
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
V
FB
f
O
I
D
V
SAT
DC
I
CL
I
L
I
Q
I
STBY
LM1501B-ADJ
1.180
255
1.215
300
15
1.250
345
50
1.4
kHz
nA
V
%
A
50
μA
mA
mA
μA
LM1501B-ADJ; V
FB
=1.215V
I
OUT
= 5A, (Note 2, 3)
(Note 3)
(Note 4)
Peak Current, (Note 2, 3)
Output = 0V (Note 2, 4)
Output = -1V, V
IN
=40V
(Note 4)
ON/OFF pin = 5V(OFF), V
IN
= 40V
100
0
6.5
2
4.5
80
1.3
30
10
200
V
IH
V
IL
Low (Regulator ON)
High (Regulator OFF)
V
LOGIC
= 2.5V (regulator OFF)
V
LOGIC
= 0.5V (regulator ON)
2.0
5
0.6
V
ON/OFF Pin Logic Input
current
I
H
I
L
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. 1.2
3
HTC
FPGA/CPLD
京公网安备 11010802033920号
EEWORLD
