MAX1623(1999) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1623
(Rev.:1999)

3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

Maxim Integrated 

3A, Low-Voltage, Step-Down Regulator with

Synchronous Rectification and Internal Switches

Loop Stability

Stable operation requires the right output filter capaci-

tor. When choosing the output capacitor, ensure the fol-

lowing conditions are met:

C2 ≥ 80⋅ tOFF ⋅ VREF

VOUT

and

10mΩ ≤ RESR, C2 ≤ 50mΩ

Circuit Layout and Grounding

Good layout is necessary to achieve the intended out-

put power level, high efficiency, and low noise. Good

layout includes the use of a ground plane, appropriate

component placement, and correct routing of traces

using appropriate trace widths. For heatsinking purpos-

es, copper area connected at the IC should be evenly

distributed among the high-current pins.

1) Minimize high-current ground loops. Connect the

input capacitor’s ground, output capacitor’s

ground, and IC PGND together.

2) A ground plane is essential for optimum perfor-

mance. In most applications, the circuit will be

located on a multilayer board, and full use of the

four or more copper layers is recommended. Use

the top and bottom layers for interconnections and

the inner layers for an uninterrupted ground plane.

3) Place the LX node components as close together

as possible. This reduces resistive and switching

losses and confines noise due to ground induc-

tance.

4) Connect the input filter capacitor less than 10mm

away from IN. The connecting copper trace carries

large currents and must be at least 2mm wide,

preferably 5mm.

5) Connect GND directly to PGND at only one point

near the IC.

___________________Chip Information

TRANSISTOR COUNT: 1220

______________________________________________________________________________________ 11

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