LM2598S-ADJ/NOPB National Semiconductor, LM2598S-ADJ/NOPB Datasheet - Page 9

• 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

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

Test Circuit and Layout Guidelines
Component Values shown are for V
120 µF, 50V, Aluminum Electrolytic Nichicon “PL Series”
120 µF, 35V Aluminum Electrolytic, Nichicon “PL Series”
3A, 40V Schottky Rectifier, 1N5822
68 µH, L30
Typical Values
*C
C
R
where V
Select R
Component Values shown are for V
V
C
C
D1
L1
R
R
C
R
Typical Values
C
C
R
OUT
DELAY
Pull Up
IN
OUT
1
2
FF
FF
SS
DELAY
PULL UP
SS
— 0.1 µF
:
— 100 µH, L29
— 1 k , 1%
— 7.15k, 1%
— 3A, 40V Schottky Rectifier, 1N5822
— 120 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”
= 10V, I
— 3.3 nF, See Application Information Section
— 3 k , See Application Information Section
:
:
— 0.1 µF
— 120 µF, 35V Aluminum Electrolytic, Nichicon “PL Series”
REF
1
— 4.7k
— 0.1 µF
to be approximately 1k , use a 1% resistor for best stability.
— 0.1 µF
— 4.7k
= 1.23V
LOAD
= 1A.
IN
IN
= 15V, V
= 20V,
FIGURE 1. Standard Test Circuits and Layout Guides
OUT
= 5V, I
Adjustable Output Voltage Versions
LOAD
Fixed Output Voltage Versions
= 1A.
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DS012593-24
DS012593-23
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