SNVA432D
March 2010 – January 2022
LM21305
Trademarks
1
LM21305 Overview
2
Typical Application Circuit
3
Evaluation Board Schematic
4
Evaluation Board Bill of Materials (BOM)
5
Connection Descriptions
6
Jumper Settings
7
Other Design Examples
8
Typical Performance Characteristics
9
Component Selection
9.1
Input Capacitors
9.2
AVIN Filter
9.3
Switching Frequency Selection
9.4
Inductor
9.5
Output Capacitor
9.6
Compensation Circuit
10
PCB Layout
11
Revision History
8
Typical Performance Characteristics
Figure 8-1
Efficiency with PVIN = AVIN = 5 V, f
S
= 500 kHz
Figure 8-3
Start-Up, No Load
Figure 8-5
Start-Up, Pre-Biased Load
Figure 8-7
Switching Waveform With 5-A Load
Figure 8-2
Efficiency with PVIN = AVIN = 12V, f
S
= 500 kHz
Figure 8-4
Start-Up, 5-A Resistive Load
Figure 8-6
Switching Waveform at No Load (DCM Mode)