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LM3485MM/NOPB
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LM3485MM/NOPB 产品设计参考 - TI

  • 制造商:
    TI
  • 分类:
    DCDC,转换器,DC-DC
  • 封装
    VSSOP-8
  • 描述:
    DC DC Cntrlr Single-OUT Buck 4.5V to 35V Input 8Pin MSOP T/R
更新时间: 2024-04-10 23:02:51 (UTC+8)

LM3485MM/NOPB 产品设计参考

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User's Guide
SNVA052BMay 2002Revised April 2013
AN-1227 LM3485 Evaluation Board
1 Introduction
The LM3485 is a hysteretic P-FET buck controller that uses a pulse-frequency modulation (PFM) scheme
to regulate the output voltage. This LM3485 demo board and the recommended components are intended
to demonstrate the performance with a 3.3 V output from a 12 V source. The demo board can be used
with source voltages from 7 V to 28 V to deliver output load currents up to 1A. By changing the size of a
single resistor, regulated output voltages from 1.242 V to 5 V can be obtained.
The circuit schematic is shown in Figure 1 and the bill of materials is given in Table 1.
Figure 1. Regulator With 3.3 V Output at 0.5A
Table 1. Bill of Materials (BOM)
Code Description Manufacturer
C1 Input Capacitor CAP-Tantalum 22 µF 35 V EEJL1VD226R Panasonic
C2 Output Capacitor CAP-POSCAP 100 µF 6.3 V 6TPC100M Sanyo
C3 C
ADJ
CAP-Ceramic Chip 1nF 50 V GRM39X7R102K50 Murata
C4 C
ff
CAP-Ceramic Chip 100pF 50 V GRM39X7R101K50 Murata
D1 Catch Diode Schottky Diode 1A 30 V MBRS130T3 On Semiconductor
L1 Inductor 22 µH LQH66SN220M01L Murata
Q1 P-channel MOSFET -60 V FDC5614P Fairchild
R1 Feedback high side resistor Chip Resistor 33 K MCR10EZHF3302 Rohm
R2 Feedback low side resistor Chip Resistor 20 K MCR10EZHF2002 Rohm
R3 R
ADJ
Chip Resistor 24K MCR10EZHF2402 Rohm
U1 Buck Controller LM3485 Texas Instruments
All trademarks are the property of their respective owners.
1
SNVA052BMay 2002Revised April 2013 AN-1227 LM3485 Evaluation Board
Submit Documentation Feedback
Copyright © 2002–2013, Texas Instruments Incorporated

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