Datasheet > MAX1634A

MAX1634A

更新时间： 2024-01-12 00:10:07

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
29页	288K
描述
Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers

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MAX1634A 数据手册

19-3518; Rev 1; 8/05

Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

________________General Description

____________________________Features

♦ 96% Efficiency

♦ +4.2V to +30V Input Range

The MAX1630A–MAX1635A are buck-topology, step-

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

ate logic-supply voltages in battery-powered systems.

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

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

signaling with delay, digital soft-start, secondary winding

control, low-dropout circuitry, internal frequency-com-

pensation networks, and automatic bootstrapping.

♦ 2.5V to 5.5V Dual Adjustable Outputs

♦ Selectable 3.3V and 5V Fixed or Adjustable

Outputs (Dual Mode™)

♦ 12V Linear Regulator

♦ Adjustable Secondary Feedback

(MAX1631A/MAX1634A)

Up to 96% 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 caused by the latest

dynamic-clock CPUs within five 300kHz clock cycles.

Strong 1A on-board gate drivers ensure fast external

n-channel MOSFET switching.

♦ 5V/50mA Linear Regulator Output

♦ Precision 2.5V Reference Output

♦ Programmable Power-Up Sequencing

♦ Power-Good (RESET) Output

♦ Output Overvoltage Protection

(MAX1630A/MAX1631A/MAX1632A)

♦ Output Undervoltage Shutdown

(MAX1630A/MAX1631A/MAX1632A)

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.

♦ 200kHz/300kHz Low-Noise, Fixed-Frequency

Operation

♦ Low-Dropout, 99% Duty-Factor Operation

♦ 2.5mW Typical Quiescent Power (+12V Input,

Both SMPSs On)

♦ 4µA Typical Shutdown Current

♦ 28-Pin SSOP Package

The MAX1630A–MAX1635A include two PWM regulators,

adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V

modes. All these devices include secondary feedback

regulation, and the MAX1630A/MAX1632A/MAX1633A/

MAX1635A each contain 12V/120mA linear regulators.

The MAX1631A/MAX1634A include a secondary feed-

back 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

PIN-PACKAGE

MAX1630AEAI

-40°C to +85°C

28 SSOP

+Denotes lead-free package.

Ordering Information continued at end of data sheet.

________________Functional Diagram

INPUT

The MAX1630A/MAX1631A/MAX1632A contain internal

output overvoltage and undervoltage protection features.

The MAX1630A family has improved RF immunity over

the MAX1630 family.

+12V

+5V (RTC)

12V

LINEAR

________________________Applications

Notebook and Subnotebook Computers

+3.3V

+5V

3.3V

SMPS

PDAs and Mobile Communicators

Desktop CPU Local DC-DC Converters

Pin Configurations and Selector Guide appear at end of data

sheet.

POWER-UP

SEQUENCE

POWER-

GOOD

ON/OFF

RESET

Idle Mode and Dual Mode are trademarks of Maxim Integrated

Products, Inc.

________________________________________________________________ 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.

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与MAX1634A相关器件

型号	品牌	获取价格	描述	数据表
MAX1634AEAI	MAXIM	获取价格	Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers
MAX1634AEAI+	MAXIM	获取价格	Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers
MAX1634AEAI+T	MAXIM	获取价格	Dual Switching Controller, 0.2A, 330kHz Switching Freq-Max, PDSO28, 5.30 MM, 0.65 MM PITCH
MAX1634CAI	ROCHESTER	获取价格	DUAL SWITCHING CONTROLLER, 300kHz SWITCHING FREQ-MAX, PDSO28, 5.30 MM, 0.65 MM PITCH, SSOP
MAX1634CAI	MAXIM	获取价格	Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers
MAX1634CAI+T	MAXIM	获取价格	Switching Controller, Current-mode, 300kHz Switching Freq-Max, BICMOS, PDSO28, 5.30 MM, 0.
MAX1634CAI-T	MAXIM	获取价格	Switching Controller, Current-mode, 300kHz Switching Freq-Max, BICMOS, PDSO28, 5.30 MM, 0.
MAX1634EAI	MAXIM	获取价格	Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers
MAX1634EAI+	MAXIM	获取价格	Dual Switching Controller, Current-mode, 300kHz Switching Freq-Max, BICMOS, PDSO28, 5.30 M
MAX1634EAI+T	MAXIM	获取价格	Switching Controller, Current-mode, 300kHz Switching Freq-Max, BICMOS, PDSO28, 5.30 MM, 0.

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