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MAX1904EAI

更新时间： 2024-11-26 22:12:59

品牌	Logo	应用领域
美信 - MAXIM		电脑控制器
页数	文件大小	规格书
33页	647K
描述
500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers

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MAX1904EAI 数据手册

19-2224; Rev 3; 12/03

500kHz Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

General Description

Features

The MAX1901/MAX1902/MAX1904 are buck-topology,

step-down, switch-mode, power-supply controllers that

generate logic-supply voltages in battery-powered sys-

tems. These high-performance, dual/triple-output devices

include on-board power-up sequencing, power-good sig-

naling with delay, digital soft-start, secondary winding

control, low dropout circuitry, internal frequency-compen-

sation networks, and automatic bootstrapping.

o 97% Efficiency

o 4.2V to 30V Input Range

o 2.5V to 5.5V Dual Adjustable Outputs

o Selectable 3.3V and 5V Fixed or Adjustable

Outputs (Dual Mode™)

o 12V Linear Regulator

o Adjustable Secondary Feedback

(MAX1901/MAX1904)

Up to 97% efficiency is achieved through synchronous

rectification and Maxim’s proprietary Idle Mode™ control

scheme. Efficiency is greater than 80% over a 1000:1

load-current range, which extends battery life in system

suspend or standby mode. Excellent dynamic response

corrects output load transients within five clock cycles.

Strong 1A on-board gate drivers ensure fast external N-

channel MOSFET switching.

o 5V/50mA Linear Regulator Output

o Precision 2.5V Reference Output

o Programmable Power-Up Sequencing

o Power-Good (RESET) Output

o Output Overvoltage Protection

(MAX1901/MAX1902)

o Output Undervoltage Shutdown

(MAX1901/MAX1902)

These devices feature a logic-controlled and synchroniz-

able, fixed-frequency, pulse-width modulation (PWM)

operating mode. This reduces noise and RF interference

in sensitive mobile communications and pen-entry appli-

cations. Asserting the SKIP pin enables fixed-frequency

mode, for lowest noise under all load conditions.

o 333kHz/500kHz Low-Noise, Fixed-Frequency

Operation

o Low-Dropout, 98% Duty-Factor Operation

o 2.5mW Typical Quiescent Power (12V input, both

SMPSs on)

o 4µA Typical Shutdown Current

The MAX1901/MAX1902/MAX1904 include two PWM reg-

ulators, adjustable from 2.5V to 5.5V with fixed 5.0V and

3.3V modes. All these devices include secondary feed-

back regulation, and the MAX1902 contains a 12V/120mA

linear regulator. The MAX1901/MAX1904 include a sec-

ondary feedback input (SECFB), plus a control pin

(STEER) that selects which PWM (3.3V or 5V) receives the

secondary feedback signal. SECFB provides a method

for adjusting the secondary winding voltage regulation

point with an external resistor divider, and is intended to

aid in creating auxiliary voltages other than fixed 12V.

Ordering Information

PART

TEMP RANGE

-40 C to +85 C

PIN-PACKAGE

28 SSOP

MAX1901EAI

MAX1901ETJ

MAX1902EAI

MAX1902ETJ

MAX1904EAI

MAX1904ETJ

32 Thin QFN 5mm x 5mm

28 SSOP

32 Thin QFN 5mm x 5mm

28 SSOP

32 Thin QFN 5mm x 5mm

The MAX1901/MAX1902 contain internal output overvolt-

age and undervoltage protection features.

Functional Diagram

________________________Applications

INPUT

Notebook and Subnotebook Computers

12V

5V (RTC)

PDAs and Mobile Communicators

LINEAR

12V

LINEAR

Desktop CPU Local DC-DC Converters

3.3V

SMPS

Idle Mode is a trademark of Maxim Integrated Products, Inc.

Dual Mode is a trademark of Maxim Integrated Products, Inc.

POWER-UP

SEQUENCE

POWER-

GOOD

ON/OFF

RESET

Pin Configurations appear at end of data sheet.

________________________________________________________________ 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...33

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MAX1904EAI 替代型号

型号	品牌	替代类型	描述	数据表
MAX1904EAI+T	MAXIM	完全替代	Dual Switching Controller, Current-mode, 0.2A, 550kHz Switching Freq-Max, BICMOS, PDSO28,
MAX1904EAI+	MAXIM	类似代替	暂无描述
MAX1904EAI-T	MAXIM	功能相似	Dual Switching Controller, Current-mode, 0.2A, 550kHz Switching Freq-Max, BICMOS, PDSO28,

与MAX1904EAI相关器件

型号	品牌	获取价格	描述	数据表
MAX1904EAI+	MAXIM	获取价格	暂无描述
MAX1904EAI+T	MAXIM	获取价格	Dual Switching Controller, Current-mode, 0.2A, 550kHz Switching Freq-Max, BICMOS, PDSO28,
MAX1904EAI-T	MAXIM	获取价格	Dual Switching Controller, Current-mode, 0.2A, 550kHz Switching Freq-Max, BICMOS, PDSO28,
MAX1904ETJ	MAXIM	获取价格	500kHz Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers
MAX1904ETJ+	MAXIM	获取价格	Dual Switching Controller, Current-mode, 0.2A, 550kHz Switching Freq-Max, BICMOS, 5 X 5 MM
MAX1904ETJ+T	MAXIM	获取价格	Dual Switching Controller, Current-mode, 0.2A, 550kHz Switching Freq-Max, BICMOS, 5 X 5 MM
MAX1904ETJ-T	MAXIM	获取价格	暂无描述
MAX1906	MAXIM	获取价格	Li+ Battery-Pack Protector with Integrated Fuse Driver
MAX1906EVKIT	MAXIM	获取价格	Evaluation Kit for the MAX1906X/MAX1906V/MAX1906S
MAX1906S	MAXIM	获取价格	Li+ Battery-Pack Protector with Integrated Fuse Driver

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