LM2594M-12/NOPB National Semiconductor, LM2594M-12/NOPB Datasheet - Page 11

• Manufacturer Part Number: LM2594M-12/NOPB
• Description: IC REG SIMPLE SWITCHER 8-SOIC
• Manufacturer: National Semiconductor
• Series: SIMPLE SWITCHER®r
• Type: Step-Down (Buck)r

Specifications of LM2594M-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)
• Primary Input Voltage: 25V
• No. Of Outputs: 1
• Output Voltage: 12V
• Output Current: 500mA
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Filter Terminals: SMD
• Input Voltage Primary Max: 40V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: *LM2594M-12; LM2594M-12

LM2594/LM2594HV Series Buck Regulator Design Procedure (Fixed
Output)
LM2594/LM2594HV Series Buck Regulator Design Procedure (Adjustable
Output)
Given:
V
V
I
F = Switching Frequency (Fixed at a nominal 150 kHz).
LOAD
OUT
IN
Voltage
Output
PROCEDURE (Adjustable Output Voltage Version)
(max) = Maximum Input Voltage
(V)
3.3
12
5
(max) = Maximum Load Current
= Regulated Output Voltage
Conditions
Current
(Continued)
Load
(A)
0.5
0.2
0.5
0.2
0.5
0.2
FIGURE 2. LM2594/LM2594HV Fixed Voltage Quick Design Component Selection Table
Max Input
Voltage
(V)
10
40
10
40
10
15
40
20
40
15
18
30
40
15
20
40
5
7
6
8
9
Inductance
(µH)
100
150
220
100
150
150
220
330
150
220
330
100
220
330
33
47
68
68
47
68
68
Inductor
Inductor
L14
L13
L21
L20
L10
L13
L21
L20
L19
L10
L21
L19
L27
L26
L11
L17
( # )
L4
L9
L9
L8
L9
11
Given:
V
V
I
F = Switching Frequency (Fixed at a nominal 150 kHz).
LOAD
HFQ Series
Panasonic
OUT
IN
(max) = 28V
220/16
120/25
120/25
120/35
120/25
120/16
120/16
180/16
180/16
120/25
120/25
120/16
120/16
(µF/V)
82/16
82/25
82/25
82/25
82/25
82/25
82/25
82/25
EXAMPLE (Adjustable Output Voltage Version)
(max) = 0.5A
= 20V
Through Hole
PL Series
Nichicon
220/16
120/25
120/25
120/35
120/25
120/16
120/16
180/16
180/16
120/25
120/25
120/16
120/16
(µF/V)
82/16
82/25
82/25
82/25
82/25
82/25
82/25
82/25
Output Capacitor
AVX TPS
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
100/16
Series
(µF/V)
Surface Mount
595D Series
Sprague
100/6.3
100/6.3
100/6.3
100/6.3
100/6.3
100/6.3
100/6.3
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(µF/V)
33/25
33/25
33/25
33/25
33/25
33/25
33/25
15/25
15/25
15/25
15/25
15/25
15/25
15/25