MAX1875

更新时间： 2024-01-13 00:10:14

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
21页	492K
描述
Dual 180∑ Out-of-Phase PWM Step- Down Controllers with POR

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MAX1875 数据手册

19-2431; Rev 0; 7/02

Dual 180° Out-of-Phase PWM Step-

Down Controllers with POR

General Description

Features

The MAX1875/MAX1876 dual, synchronized, step-down

controller generates two outputs from input supplies

ranging from 4.75V to 23V. Each output is adjustable from

sub-1V to 18V and supports loads of 10A or higher. Input

voltage ripple and total RMS input ripple current are

reduced by synchronized 180° out-of-phase operation.

o Two Independent Output Voltages

o 180° Out-of-Phase Operation

o 90° Out-of-Phase Operation

(Using Two MAX1875/MAX1876s)

o Foldback Current Limit

The switching frequency is adjustable from 100kHz to

600kHz with an external resistor. Alternatively, the con-

troller can be synchronized to an external clock gener-

ated to another MAX1875/MAX1876 or a system clock.

One MAX1875/MAX1876 can be set to generate an in-

phase, or 90° out-of-phase, clock signal for synchro-

nization with additional controllers. This allows two

controllers to operate either as an interleaved two- or

four-phase system with each output shifted by 90°.

These devices also feature soft-start and soft-stop.

o 4.75V to 23V Input Supply Range

o 0 to 18V Output-Voltage Range (Up to 10A)

o >90% Efficiency

o Fixed-Frequency Pulse-Width Modulation (PWM)

Operation

o Adjustable 100kHz to 600kHz Switching

Frequency

The MAX1875/MAX1876 eliminate the need for current-

sense resistors by utilizing the low-side MOSFET’s on-

resistance as a current-sense element. This protects

the DC-DC components from damage during output-

overload conditions or when output short-circuit faults

without requiring a current-sense resistor. Adjustable

foldback current limit reduces power dissipation during

short-circuit conditions. The MAX1876 includes a

power-on reset output to signal the system when both

outputs reach regulation.

o External SYNC Input

o Clock Output for Master/Slave Synchronization

o Soft-Start and Soft-Stop

o RST Output with 140ms Minimum Delay (MAX1876)

o Lossless Current Limit (No Sense Resistor)

Ordering Information

PART

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

24 QSOP

The MAX1875/MAX1876 are available in a 24-pin QSOP

package. An evaluation kit is available to speed designs.

MAX1875EEG

MAX1876EEG

24 QSOP

Applications

Network Power Supplies

Telecom Power Supplies

DSP, ASIC, and FPGA Power Supplies

Set-Top Boxes

Pin Configuration

TOP VIEW

COMP2

24 EN

FB2

ILIM2

OSC

V+

23 DH2

Broadband Routers

Servers

LX2

21 BST2

20 DL2

REF

MAX1875/

MAX1876

19 V

GND

CKO

SYNC

18 PGND

17 DL1

Typical Operating Circuit appears at end of data sheet.

16 BST1

ILIM1 10

FB1 11

LX1

DH1

COMP1 12

13 RST

(MAX1876 ONLY)

QSOP

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...21

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与MAX1875相关器件

型号	品牌	获取价格	描述	数据表
MAX1875AEEG	MAXIM	获取价格	Dual 180∑ Out-of-Phase Buck Controllers with
MAX1875AEEG+	MAXIM	获取价格	Dual Switching Controller, Voltage-mode, 660kHz Switching Freq-Max, BICMOS, PDSO24, 0.150
MAX1875AEEG+T	MAXIM	获取价格	Dual Switching Controller, Voltage-mode, 660kHz Switching Freq-Max, BICMOS, PDSO24, 0.150
MAX1875AEEG-T	MAXIM	获取价格	Dual Switching Controller, Voltage-mode, 660kHz Switching Freq-Max, BICMOS, PDSO24, 0.150
MAX1875EEG	MAXIM	获取价格	Dual 180∑ Out-of-Phase PWM Step- Down Control
MAX1875EEG+	MAXIM	获取价格	Dual Switching Controller, Voltage-mode, 0.05A, 600kHz Switching Freq-Max, BICMOS, PDSO24,
MAX1875EEG+T	MAXIM	获取价格	Dual Switching Controller, Voltage-mode, 0.05A, 600kHz Switching Freq-Max, BICMOS, PDSO24,
MAX1875EEG-T	MAXIM	获取价格	Dual Switching Controller, Voltage-mode, 0.05A, 600kHz Switching Freq-Max, BICMOS, PDSO24,
MAX1875EVKIT	MAXIM	获取价格	Evaluation Kit for the MAX1875/MAX1876/MAX1858
MAX1875-MAX1876	MAXIM	获取价格	Dual 180∑ Out-of-Phase PWM Step- Down Control

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