Datasheet > 电源电路 > 开关式稳压器或控制器> MAX746C/D

MAX746C/D

更新时间： 2024-11-23 22:55:11

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
16页	158K
描述
High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller

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中文翻译

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数据手册

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MAX746C/D 数据手册

19-0192; Rev 1; 11/93

Hig h -Effic ie n c y, P WM, S t e p -Do w n ,

N-Ch a n n e l DC-DC Co n t ro lle r

MAX746

_______________Ge n e ra l De s c rip t io n

____________________________Fe a t u re s

The MAX746 is a high-efficiency, high-current, step-down

DC-DC power-supply controller that drives external N-chan-

nel FETs. It provides 93% to 96% efficiency from a 6V supply

voltage with load currents ranging from 50mA up to 3A. It

uses a pulse-width-modulating (PWM) current-mode control

scheme to provide precise output regulation and low output

noise. The MAX746's 4V to 15V input voltage range, fixed

♦ 93% to 96% Efficiency for 50mA to 3A

Output Currents

♦ 4V to 15V Input Voltage Range

♦ Low 950µA Supply Current

♦ 1.4µA Shutdown Current

♦ Drives External N-Channel FETs

♦ Fixed-Frequency Current-Mode PWM (Heavy Loads)

♦ Idle-Mode PFM (Light Loads)

5V/adjustable (Dual-Mode ) output, and adjustable current

limit make this device ideal for a wide range of applications.

High efficiency is maintained with light loads due to a propri-

etary automatic pulse-skipping control (Idle-Mode ) scheme

♦ Cycle-by-Cycle Current Limiting

♦ 2V ±1.5% Accurate Reference Output

♦ Adjustable Soft-Start

that minimizes switching losses by reducing the switching fre-

quency at light loads. The low 950µA quiescent current and

ultra-low 1.4µA shutdown current further extend battery life.

♦ Undervoltage Lockout

External components are protected by the MAX746's cycle-

by-cycle current limit. The MAX746 also features a 2V ±1.5%

reference, a comparator for low-battery detection or level

translating, and soft-start and shutdown capability.

♦ Precision Comparator for Power-Fail or

Low-Battery Warning

______________Ord e rin g In fo rm a t io n

The MAX747—d is c us s e d in a s e p a ra te d a ta s he e t—

functions similarly to the MAX746, but drives P-channel logic

level FETs.

PART

TEMP. RANGE

0°C to +70°C

PIN-PACKAGE

16 Plastic DIP

16 Narrow SO

Dice*

MAX746CPE

MAX746CSE

MAX746C/D

MAX746EPE

MAX746ESE

MAX746MJE

________________________Ap p lic a t io n s

0°C to +70°C

5V-to-3.3V Green PC Applications

Notebook/Laptop Computers

Personal Digital Assistants

Battery-Operated Equipment

Cellular Phones

0°C to +70°C

-40°C to +85°C

-55°C to +125°C

16 Plastic DIP

16 Narrow SO

16 CERDIP

* Contact factory for dice specifications.

__________Typ ic a l Op e ra t in g Circ u it

__________________P in Co n fig u ra t io n

INPUT 6V TO 15V

TOP VIEW

V+

AV+

40mΩ

LBO

LBI

GND

V+

MAX746

HIGH

SHDN

EXT

OUTPUT

ON/OFF

39µH

REF

HIGH

EXT

AGND

MAX746

SHDN

LOW-BATTERY

DETECTOR INPUT

440µF

LBI

OUT

LOW-BATTERY

DETECTOR OUTPUT

LBO

REF

SS CC

AGND

GND

AV+

OUT

DIP/SO

™Dual-Mode and Idle-Mode are trademarks of Maxim Integrated Products.

________________________________________________________________ Maxim Integrated Products

Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .

12 3 4 5 6 7...16

中文翻译

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与MAX746C/D相关器件

型号	品牌	获取价格	描述	数据表
MAX746CPE	MAXIM	获取价格	High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller
MAX746CSE	MAXIM	获取价格	High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller
MAX746CSE-T	MAXIM	获取价格	暂无描述
MAX746EPE	MAXIM	获取价格	High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller
MAX746ESE	MAXIM	获取价格	High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller
MAX746MJE	MAXIM	获取价格	High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller
MAX747	MAXIM	获取价格	High-Efficiency PWM, Step-Down P-Channel DC-DC Controller
MAX7470	MAXIM	获取价格	HDTV Continuously Variable Anti-Aliasing Filters
MAX7470UTP	MAXIM	获取价格	HDTV Continuously Variable Anti-Aliasing Filters
MAX7470UTP+	MAXIM	获取价格	HDTV Continuously Variable Anti-Aliasing Filters

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