LM2598S-ADJ/NOPB National Semiconductor, LM2598S-ADJ/NOPB Datasheet - Page 8
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LM2598S-ADJ/NOPB
Manufacturer Part Number
LM2598S-ADJ/NOPB
Description
IC REG SW ADJ 1A STP DN TO263-7
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Datasheet
1.LM2598T-12NOPB.pdf
(33 pages)
Specifications of LM2598S-ADJ/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.2 ~ 37 V
Current - Output
1A
Frequency - Switching
150kHz
Voltage - Input
4.5 ~ 40 V
Operating Temperature
-25°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
D²Pak, TO-263 (7 leads + tab)
Package
8TO-263
Minimum Input Voltage
4.5 V
Maximum Input Voltage
40 V
Switching Frequency
173 KHz
Operating Supply Voltage
4.5 to 40 V
Maximum Output Current
1 A
Output Type
Adjustable
Output Voltage
1.2 to 37 V
Efficiency
78(Typ) %
For Use With
551011367-011 - BOARD WEBENCH BUILD IT LM2598
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
*LM2598S-ADJ
*LM2598S-ADJ/NOPB
LM2598S-ADJ
*LM2598S-ADJ/NOPB
LM2598S-ADJ
www.national.com
Typical Performance Characteristics
Continuous Mode Switching Waveforms
V
L = 68 µH, C
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.5A/div.
C: Output Ripple Voltage, 50 mV/div.
Load Transient Response for Continuous Mode
V
L = 68 µH, C
A: Output Voltage, 100 mV/div. (AC)
B: 250 mA to 750 mA Load Pulse
IN
IN
= 20V, V
= 20V, V
Horizontal Time Base: 100 µs/div.
OUT
OUT
Horizontal Time Base: 2 µs/div.
OUT
OUT
= 5V, I
= 5V, I
= 120 µF, C
= 120 µF, C
LOAD
LOAD
= 1A
= 250 mA to 750 mA
OUT
OUT
ESR = 100 m
ESR = 100 m
DS012593-18
DS012593-20
(Circuit of Figure 1 )
Discontinuous Mode Switching Waveforms
V
L = 22 µH, C
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.5A/div.
C: Output Ripple Voltage, 50 mV/div.
Load Transient Response for Discontinuous Mode
V
L = 22 µH, C
A: Output Voltage, 100 mV/div. (AC)
B: 250 mA to 750 mA Load Pulse
8
IN
IN
= 20V, V
= 20V, V
Horizontal Time Base: 200 µs/div.
OUT
OUT
Horizontal Time Base: 2 µs/div.
OUT
OUT
= 5V, I
= 5V, I
= 220 µF, C
= 220 µF, C
LOAD
LOAD
= 600 mA
= 250 mA to 750 mA
OUT
OUT
ESR = 50 m
ESR = 50 m
DS012593-19
DS012593-21