LM2597M-5.0/NOPB National Semiconductor, LM2597M-5.0/NOPB Datasheet - Page 7

• Manufacturer Part Number: LM2597M-5.0/NOPB
• Description: IC REG SIMPLE SWITCHER 8-SOIC
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r
• Type: Step-Down (Buck)r

Specifications of LM2597M-5.0/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 500mA
• Frequency - Switching: 150kHz
• Voltage - Input: 4.5 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Primary Input Voltage: 12V
• No. Of Outputs: 1
• Output Voltage: 5V
• Output Current: 500mA
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Supply Voltage Range: 4.5V To 40V
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Input Voltage Primary Max: 40V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: *LM2597M-5.0; *LM2597M-5.0/NOPB; LM2597M-5.0

Typical Performance Characteristics
V
V
Continuous Mode Switching Waveforms
V
L = 100 µH, C
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.2A/div.
C: Output Ripple Voltage, 20 mV/div.
Load Transient Response for Continuous Mode
V
L = 100 µH, C
A: Output Voltage, 50 mV/div. (AC)
B: 200 mA to 500 mA Load Pulse
IN
BS
IN
IN
and V
= 20V, V
= 20V, V
and Temperature
BS
Horizontal Time Base: 50 µs/div.
OUT
OUT
Horizontal Time Base: 2 µs/div.
Current vs
OUT
OUT
= 5V, I
= 5V, I
= 120 µF, C
= 120 µF, C
LOAD
LOAD
DS012440-17
= 400 mA
= 200 mA to 500 mA
OUT
OUT
ESR = 140 m
ESR = 140 m
Soft-start Response
DS012440-21
DS012440-19
Discontinuous Mode Switching Waveforms
V
L = 33 µH, C
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.2A/div.
C: Output Ripple Voltage, 20 mV/div.
Load Transient Response for Discontinuous Mode
V
L = 33 µH, C
A: Output Voltage, 50 mV/div. (AC)
B: 100 mA to 200 mA Load Pulse
(Continued)
7
IN
IN
= 20V, V
= 20V, V
DS012440-18
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
Shutdown /Soft-start
Threshold Voltage
= 200 mA
= 100 mA to 200 mA
OUT
OUT
ESR = 60 m
ESR = 60 m
DS012440-20
DS012440-22
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DS012440-25