LM2596HV
60V 3A 150kHz Step-Down Voltage Regulator
GENERAL DESCRIPTION
The LM2596HV series of regulators are monolithic integrated circuits that
provide all the active functions for a step-down (buck) switching regulator,
capable of driving a 3A 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.
Available in a standard 5-lead TO-220 package, 5-lead TO-263 surface
mount package and SOP-8 package.
External shutdown is included, featuring typically 30 μA standby current.
The output switch includes cycle-by-cycle current limiting, as well as
thermal shutdown, and protection from output short for full protection
under fault conditions.
PIN CONFIGURATION
FEATURES
3.3V, 5V, 12V, and adjustable output versions
Adjustable version output voltage range, 1.2V to 57V
±4% maximum over line and load conditions
Available in TO-220 and TO-263 packages and SOP-8 (for lload<2A)
Guaranteed 3A output load current
Input voltage range up to 60V
Requires only 4 external components
Excellent line and load regulation specifications
150 kHz fixed frequency internal oscillator
Low power standby mode, Istb typically 30 μA
High efficiency
Thermal shutdown and current limit protection
Output short protection by reduction of frequency by
3 times.
PIN ASSIGNMENT
Pin
1
2
3
4
5 to 8
SOP-8 (for
Iload<2A)
Vin
Output
FB
On/Off
Gnd
Pin
1
2
3
4
5
TO-220,
TO-263
Vin
Output
Gnd
FB
On/Off
APPLICATIONS
Simple high-efficiency step-down (buck) regulator
On-card switching regulators
Efficient pre-regulator for linear regulators
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2018 AUG
LM2596HV
ABSOLUTE MAXIMUM RATINGS
Parameter
Maximum supply voltage
ON/OFF Pin input voltage
FB (Feedback) pin voltage
Output voltage to GND
Power dissipation
Minimum ESD rating HBM (C=100pF, R=1.5k)
Maximum junction temperature
Symbol
V
IN
V
ON/OFF
V
FB
V
OUT
P
D
ESD
T
J,max
Ratings
63
-0.3 to 60, ≤ Vin
-0.3 to 25, ≤ Vin
-1
Internally limited
2.0
150°C
Unit
V
V
V
V
W
kV
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Temperature range
Supply voltage
I
LOAD
Symbol
T
J
Vop
I
LOAD
Ratings
-40°C ≤ Tj ≤ +125°C
4.5 to 60
I
LOAD
≤ 3.0
Unit
°C
V
A
ELECTRICAL CHARACTERISTICS
Unless specified otherwise, V
IN
=12V for the 3.3V, 5V and adjustable versions, I
LOAD
=0.5A, V
IN
=18V for 12V version.
The * denotes the specifications, which apply over full operating temperature range T
J
= -40 to +125°C.
Parameter
Symbol
Conditions
*
Min
Typ
Max
SYSTEM PARAMETERS Test Circuit Figure 1
Output
LM2596HV-3.3 V
OUT
5.5V ≤ V
IN
≤ 60V, 0.2A ≤ I
LOAD
≤ 3A
3.185
3.432
3.300
voltage
*
3.152
3.465
8V ≤ V
IN
≤ 60V, 0.2A ≤ I
LOAD
≤ 3A
LM2596HV-5.0
4.825
5.20
5.00
*
4.775
5.25
15V ≤ V
IN
≤ 60V, 0.2A ≤ I
LOAD
≤ 3A
LM2596HV-12
11.58
12.48
12.00
*
11.46
12.60
LM2596HV-ADJ
8V ≤ V
IN
≤ 60V, 0.2A ≤ I
LOAD
≤ 3A
1.193
1.273
1.230
*
1.180
1.285
Line Regulation
Line Reg
8 ≤ V
IN
≤ 60V, I
LOAD
= 0.2A
0.3
Load Regulation
Load Reg 10mA≤ I
LOAD
≤ 3A, V
IN
= 12V
0.3
Efficiency
V
IN
=12V, I
LOAD
=3A
77
LM2596HV-3.3 η
V
IN
=12V, I
LOAD
=3A
79
LM2596HV-5.0
V
IN
=15V I
LOAD
=3A
LM2596HV-12
83
LM2596HV-ADJ
DEVICE PARAMETERS
Quiescent current
Feedback bias current
Shutdown supply current
Oscillator frequency
Oscillator frequency of Short
Circuit Protect (SCP)
Max. duty cycle
Min. duty cycle
I
Q
I
FB
I
STB
F
OSC
*
F
SCP
DC
(Max)
DC
(Min)
When V
OUT
<40% from nominal,
I
OUT
= CL
V
FB
=0V force driver on
V
FB
=12V force driver off (V
FB
=15V
for -12V version)
V
IN
=12V, I
LOAD
=3A V
OUT
=5V
V
FB
=12V force driver off
V
FB
=1.3V (Adjustable version
only)
V
ON/OFF
=5V, V
IN
=60V
*
133
120
150
50
*
*
100
0
%
*
-250
-450
79
5
-70
30
220
280
168
180
8
mA
nA
µA
kHz
kHz
Unit
V
V
V
V
%
%
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2018 AUG
LM2596HV
Current limit
CL
Peak current. No outside circuit.
V
FB
=0V
*
I
OUT
=3A. No outside circuit.
V
FB
=0V
V
OUT
=0V. No outside circuit.
V
FB
=12V
V
OUT
=-1V. No outside circuit.
V
FB
=12V
*
V
ON/OFF
=2.5V
V
ON/OFF
=0.5V
T
J
4.1
3.8
5.3
1.35
6.7
7.0
1.50
1.70
A
V
µA
mA
Saturation voltage
Output leakage current
Output leakage current
ON/OFF input threshold
ON/OFF input current
ON/OFF input current
Thermal shutdown
temperature
V
SAT
I
L
I
L1
V
TH
I
H
I
L
T
SD
*
-300
-30
0.6
-5
-1
-50
-3
1.3
-0.1
-0.01
160
2.0
5
1
V
µA
µA
C
BLOCK DIAGRAM
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2018 AUG
LM2596HV
TEST CIRCUIT AND LAYOUT GUIDELINES
Vout =Vref*(1+R2/R1), where Vref=1.23V; R1 between 1k and 5k.
FIGURE 1.
For minimal inductance and ground loops, the wires indicated by
heavy lines should be wide printed circuit traces and
kept as short as possible.
Keep the FEEDBACK wiring away from the inductor flux.
Cff~1 to 10nF – as option.
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2018 AUG
LM2596HV
TYPICAL CHARACTERISTICS
Fig.1. Eff, vs Vin
Line Reg,%
Fig.2. Line Reg vs Vin
Fig.3. Load Reg vs Iload
5
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2018 AUG
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