LM2597M-12/NOPB National Semiconductor, LM2597M-12/NOPB Datasheet - Page 19
![IC REG SIMPLE SWITCHER 8-SOIC](/photos/7/60/76085/lm2597m-12_nopb_sml.jpg)
LM2597M-12/NOPB
Manufacturer Part Number
LM2597M-12/NOPB
Description
IC REG SIMPLE SWITCHER 8-SOIC
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Datasheet
1.LM2597M-3.3NOPB.pdf
(34 pages)
Specifications of LM2597M-12/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
12V
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)
Supply Voltage Range
4.5V To 40V
Termination Type
SMD
Driver Case Style
NSOIC
No. Of Pins
8
Output Voltage Min
1.23V
Voltage Regulator Type
Buck Switching
Rohs Compliant
Yes
Filter Terminals
SMD
Input Voltage Primary Max
40V
Leaded Process Compatible
Yes
No. Of Outputs
1
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
*LM2597M-12
*LM2597M-12/NOPB
LM2597M-12
*LM2597M-12/NOPB
LM2597M-12
Typical Circuit and Layout Guidelines
Component Values shown are for V
C
C
D1
L1
Typical Values
C
C
R
*Use Bias Supply pin for 5V and 12V Versions
Select R
Component Values shown are for V
V
C
C
D1
L1
R
R
C
Typical Values
C
C
R
*For output voltages between 4V and 20V
OUT
IN
OUT
SS
DELAY
Pull Up
IN
OUT
1
2
FF
SS
DELAY
PULL UP
— 3.3 nF, See Application Information Section
— 0.1 µF
— 150 µH, L19
— 1 k , 1%
— 7.15k, 1%
= 10V, I
— 1A, 30V Schottky Rectifier, 1N5818
— 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”
— 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”
— 47 µF, 50V, Aluminum Electrolytic Nichicon “PL Series”
— 68 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”
— 0.1 µF
— 100 µH, L20
— 1A, 30V Schottky Rectifier, 1N5818
— 0.1 µF
1
— 0.1 µF
— 4.7k
to be approximately 1 k , use a 1% resistor for best stability.
— 4.7k
Adjustable Output Voltage Versions
LOAD
= 500 mA.
IN
IN
= 15V, V
= 20V,
OUT
FIGURE 12. Typical Circuits and Layout Guides
= 5V, I
LOAD
Fixed Output Voltage Versions
= 500 mA.
19
DS012440-56
DS012440-27
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