LM2597N-3.3 반도체 회로 부품 판매점
SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator/ with Features
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 National Semiconductor |
March 1998
LM2597/LM2597HV
SIMPLE SWITCHER® Power Converter 150 kHz 0.5A
Step-Down Voltage Regulator, with Features
General Description
The LM2597/LM2597HV series of regulators are monolithic
integrated circuits that provide all the active functions for a
step-down (buck) switching regulator, capable of driving a
0.5A load with excellent line and load regulation. These de-
vices are available in fixed output voltages of 3.3V, 5V, 12V,
and an adjustable output version, and are packaged in an
8-lead DIP and an 8-lead surface mount package.
This series of switching regulators is similar to the LM2594
series, with additional supervisory and performance features
added.
Requiring a minimum number of external components, these
regulators are simple to use and include internal frequency
compensation†, improved line and load specifications,
fixed-frequency oscillator, Shutdown /Soft-start, error flag
delay and error flag output.
The LM2597/LM2597HV series operates at a switching fre-
quency of 150 kHz thus allowing smaller sized filter compo-
nents than what would be needed with lower frequency
switching regulators. Because of its high efficiency, the cop-
per traces on the printed circuit board are normally the only
heat sinking needed.
A standard series of inductors (both through hole and sur-
face mount types) are available from several different manu-
facturers optimized for use with the LM2597/LM2597HV se-
ries. This feature greatly simplifies the design of
switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on out-
put voltage under all conditions of input voltage and output
load conditions, and ±15% on the oscillator frequency. Ex-
ternal shutdown is included, featuring typically 85 µA
standby current. Self protection features include a two stage
current limit for the output switch and an over temperature
shutdown for complete protection under fault conditions.
The LM2597HV is for use in applications requiring and input
voltage up to 60V.
Features
n 3.3V, 5V, 12V, and adjustable output versions
n Adjustable version output voltage range, 1.2V to 37V
(57V for HV version)±4% max over line and load
conditions
n Guaranteed 0.5A output current
n Available in 8-pin surface mount and DIP-8 package
n Input voltage range up to 60V
n 150 kHz fixed frequency internal oscillator
n Shutdown /Soft-start
n Out of regulation error flag
n Error output delay
n Bias Supply Pin (VBS) for internal circuitry improves
efficiency at high input voltages
n Low power standby mode, IQ typically 85 µA
n High Efficiency
n Uses readily available standard inductors
n Thermal shutdown and current limit protection
Applications
n Simple high-efficiency step-down (buck) regulator
n Efficient pre-regulator for linear regulators
n On-card switching regulators
n Positive to Negative converter
Typical Application (Fixed Output Voltage Versions)
†Patent Number 5,382,918.
SIMPLE SWITCHER® and Switchers Made Simple ® are registered trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012440
DS012440-1
www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Maximum Supply Voltage (VIN)
LM2597
LM2597HV
SD /SS Pin Input Voltage (Note 2)
Delay Pin Voltage (Note 2)
Flag Pin Voltage
Bias Supply Voltage (VBS)
Feedback Pin Voltage
Output Voltage to Ground
(Steady State)
Power Dissipation
Storage Temperature Range
45V
60V
6V
1.5V
−0.3 ≤ V ≤45V
−0.3 ≤ V ≤30V
−0.3 ≤ V ≤+25V
−1V
Internally limited
−65˚C to +150˚C
ESD Susceptibility
Human Body Model (Note 3)
Lead Temperature
M8 Package
Vapor Phase (60 sec.)
Infrared (15 sec.)
N Package (Soldering, 10 sec.)
Maximum Junction Temperature
Operating Conditions
Temperature Range
Supply Voltage
LM2597
LM2597HV
2 kV
+215˚C
+220˚C
+260˚C
+150˚C
−40˚C ≤ TJ +125˚C
4.5V to 40V
4.5V to 60V
LM2597/LM2597HV-3.3
Electrical Characteristics
Specifications with standard
ture Range.VINmax=40V for
type face are for
the LM2597 and
TJ = 25˚C,
60V for the
and those with
LM2597HV
boldface
type
apply
over
full
Operating
Tempera-
Symbol
Parameter
Conditions
LM2597/LM2597HV-3.3
Typ Limit
Units
(Limits)
(Note 4)
(Note 5)
SYSTEM PARAMETERS (Note 6) Test Circuit Figure 12
VOUT
Output Voltage
4.75V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A
3.3 V
3.168/3.135
V(min)
3.432/3.465
V(max)
η Efficiency
VIN = 12V, ILOAD = 0.5A
80
%
LM2597/LM2597HV-5.0
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range.VINmax=40V for the LM2597 and 60V for the LM2597HV
Symbol
Parameter
Conditions
LM2597/LM2597HV-5.0
Typ Limit
Units
(Limits)
(Note 4)
(Note 5)
SYSTEM PARAMETERS (Note 6) Test Circuit Figure 12
VOUT
Output Voltage
7V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.5A
5V
4.800/4.750
V(min)
5.200/5.250
V(max)
η Efficiency
VIN = 12V, ILOAD = 0.5A
82
%
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LM2597N-3.3
SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator/ with Features - National Semiconductor
