LM2598S-ADJ/NOPB National Semiconductor, LM2598S-ADJ/NOPB Datasheet - Page 8

• 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

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