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LM2598T-5.0 데이터시트 PDF




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부품번호 LM2598T-5.0 기능
기능 SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator/ with Features
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LM2598T-5.0 데이터시트, 핀배열, 회로
March 1998
LM2598
SIMPLE SWITCHER® Power Converter 150 kHz
1A Step-Down Voltage Regulator, with Features
General Description
The LM2598 series of regulators are monolithic integrated
circuits that provide all the active functions for a step-down
(buck) switching regulator, capable of driving a 1A load with
excellent line and load regulation. These devices are avail-
able in fixed output voltages of 3.3V, 5V, 12V, and an adjust-
able output version.
This series of switching regulators is similar to the LM2595
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 LM2598 series operates at a switching frequency of 150
kHz thus allowing smaller sized filter components than what
would be needed with lower frequency switching regulators.
Available in a standard 7-lead TO-220 package with several
different lead bend options, and a 7-lead TO-263 surface
mount package. Typically, for output voltages less than 12V,
and ambient temperatures less than 50˚C, no heat sink is re-
quired.
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 LM2598 series. This fea-
ture 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.
Features
n 3.3V, 5V, 12V, and adjustable output versions
n Adjustable version output voltage range, 1.2V to 37V
±4% max over line and load conditions
n Guaranteed 1A output current
n Available in 7-pin TO-220 and TO-263 (surface mount)
package
n Input voltage range up to 40V
n Excellent line and load regulation specifications
n 150 kHz fixed frequency internal oscillator
n Shutdown /Soft-start
n Out of regulation error flag
n Error output delay
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 DS012593
DS012593-1
www.national.com




LM2598T-5.0 pdf, 반도체, 판매, 대치품
LM2598-ADJ
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range.
Symbol
Parameter
Conditions
LM2598-ADJ
Typ Limit
Units
(Limits)
(Note 4)
(Note 5)
SYSTEM PARAMETERS (Note 6) Test Circuit Figure 1
VFB Feedback Voltage 4.5V VIN 40V, 0.1A ILOAD 1A
1.230
V
VOUT programmed for 3V. Circuit of Figure 12.
1.193/1.180
V(min)
1.267/1.280
V(max)
η Efficiency
VIN = 12V, VOUT = 3V, ILOAD = 1A
78
%
All Output Voltage Versions
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the 12V version.
ILOAD = 200 mA
Symbol
Parameter
Conditions
LM2598-XX
Typ Limit
Units
(Limits)
(Note 4) (Note 5)
DEVICE PARAMETERS
Ib
Feedback Bias Current
Adjustable Version Only, VFB = 1.3V
10 nA
50/100 nA(max)
fO Oscillator Frequency
(Note 7)
150 kHz
127/110 kHz(min)
173/173 kHz(max)
VSAT
Saturation Voltage
IOUT = 1A (Note 8) (Note 9)
1V
1.2/1.3
V(max)
DC Max Duty Cycle (ON)
(Note 9)
100 %
Min Duty Cycle (OFF)
(Note 10)
0
ICL Current Limit
Peak Current, (Note 8) (Note 9)
1.5 A
1.2/1.15
A(min)
2.4/2.6
A(max)
IL
Output Leakage Current
Output = 0V (Note 9) (Note 10) (Note 11)
Output = −1V
50 µA(max)
2 mA
15 mA(max)
IQ Operating Quiescent
Current
SD /SS Pin Open, (Note 10)
5 mA
10 mA(max)
ISTBY
Standby Quiescent
Current
SD /SS pin = 0V, (Note 11)
85 µA
200/250 µA(max)
θJC Thermal Resistance
TO220 or TO263 Package, Junction to Case
θJA TO220 Package, Junction to Ambient (Note 12)
θJA TO263 Package, Junction to Ambient (Note 13)
θJA TO263 Package, Junction to Ambient (Note 14)
θJA TO263 Package, Junction to Ambient (Note 15)
SHUTDOWN/SOFT-START CONTROL Test Circuit of Figure 1
2
50
50
30
20
˚C/W
˚C/W
˚C/W
˚C/W
˚C/W
VSD Shutdown Threshold
Voltage
Low, (Shutdown Mode)
1.3 V
0.6 V(max)
High, (Soft-start Mode)
2 V(min)
VSS Soft-start Voltage
VOUT = 20% of Nominal Output Voltage
VOUT = 100% of Nominal Output Voltage
2
3
V
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LM2598T-5.0 전자부품, 판매, 대치품
Typical Performance Characteristics (Circuit of Figure 1) (Continued)
Soft-start
Shutdown/Soft-start
Current
Delay Pin Current
DS012593-9
Soft-start Response
DS012593-10
Shutdown/Soft-start
Threshold Voltage
DS012593-11
DS012593-12
DS012593-13
Typical Performance Characteristics (Circuit of Figure 1)
Continuous Mode Switching Waveforms
VIN = 20V, VOUT = 5V, ILOAD = 1A
L = 68 µH, COUT = 120 µF, COUT ESR = 100 m
Discontinuous Mode Switching Waveforms
VIN = 20V, VOUT = 5V, ILOAD = 600 mA
L = 22 µH, COUT = 220 µF, COUT ESR = 50 m
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.5A/div.
C: Output Ripple Voltage, 50 mV/div.
Horizontal Time Base: 2 µs/div.
DS012593-18
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.5A/div.
C: Output Ripple Voltage, 50 mV/div.
Horizontal Time Base: 2 µs/div.
DS012593-19
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LM2598T-5.0

SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator/ with Features

National Semiconductor
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