Microchip MIC2126 Bedienungsanleitung

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 2015 Microchip Technology Inc.DS20005459B-page 1

MIC2125/6

Features

•Hyper Speed Control Architecture Enables:

-High delta V operation (V

IN

= 28V and V

OUT

= 0.6V)

-Any Capacitor™ stable

•4.5V to 28V Input Voltage

•Adjustable Output Voltage from 0.6V to 24V

•200 kHz to 750 kHz Programmable Switching

Frequency

•HyperLight Load

®

(MIC2125)

•Hyper Speed Control

®

(MIC2126)

•Enable Input and Power Good Output

•Built-in 5V Regulator for Single-Supply Operation

•Programmable current limit and “hiccup” mode

short-circuit protection

•7 ms internal soft-start, internal compensation,

and thermal shutdown

•Supports Safe Start-Up into a Prebiased Output

•–40°C to +125°C Junction Temperature Range

•Available in 16-pin, 3 mm × 3 mm QFN Package

Applications

•Networking/Telecom Equipment

•Base Stations, Servers

•Distributed Power Systems

•Industrial Power Supplies

General Description

The MIC2125 and MIC2126 are constant-frequency

synchronous buck controllers featuring a unique

adaptive ON-time control architecture. The MIC2125/6

operate over an input voltage range from 4.5V to 28V

and can be used to supply load current up to 25A. The

output voltage is adjustable down to 0.6V with a

guaranteed accuracy of ±1%. The device operates with

programmable switching frequency from 200 kHz to

750 kHz.

HyperLight Load

®

architecture provides the same high

efficiency and ultra-fast transient response as the

Hyper Speed Control

®

architecture under medium to

heavy loads. It also maintains high efficiency under

light load conditions by transitioning to variable

frequency, discontinuous conduction mode operation.

The MIC2125/6 offer a full suite of features to ensure

protection of the IC during fault conditions. These

include undervoltage lockout to ensure proper

operation under power-sag conditions, internal

soft-start to reduce inrush current, “hiccup” mode

short-circuit protection, and thermal shutdown.

Package Type

MIC2125/6

16-Pin 3 mm x 3 mm QFN (ML)

VDD

PVDD

ILIM

DL

AGND

NC

OVP

BST

FB

PG

EN

VIN

SW

DH

FREQ

PGND

EP 17

1

2

3

4

5678

12

11

10

9

16151413

28V Synchronous Buck Controllers

Featuring Adaptive ON-Time Control

Produktspezifikationen