Datasheet > MAX1742_05

MAX1742_05

更新时间： 2024-11-15 02:52:07

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
16页	287K
描述
1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches

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MAX1742_05 数据手册

19-1760; Rev 2; 9/05

1A/2.7A, 1MHz, Step-Down Regulators with

Synchronous Rectification and Internal Switches

General Description

Features

The MAX1742/MAX1842 constant-off-time, pulse-width-

modulated (PWM) step-down DC-DC converters are ideal

for use in 5V and 3.3V to low-voltage conversion neces-

sary in notebook and subnotebook computers. These

devices feature internal synchronous rectification for high

efficiency and reduced component count. They require

no external Schottky diode. The internal 90mΩ PMOS

power switch and 70mΩ NMOS synchronous-rectifier

switch easily deliver continuous load currents up to 1A.

The MAX1742/MAX1842 produce a preset 2.5V, 1.8V, or

1.5V output voltage or an adjustable output from 1.1V to

♦

1% Output Accuracy

♦ 95% Efficiency

♦ Internal PMOS and NMOS Switches

90mΩ On-Resistance at V = 4.5V

110mΩ On-Resistance at V = 3V

♦ Output Voltage

2.5V, 1.8V, or 1.5V Pin Selectable

1.1V to V Adjustable

♦ 3V to 5.5V Input Voltage Range

V . They achieve efficiencies as high as 95%.

♦ 600μA (max) Operating Supply Current

♦ <1μA Shutdown Supply Current

♦ Programmable Constant-Off-Time Operation

♦ 1MHz (max) Switching Frequency

♦ Idle-Mode Operation at Light Loads

♦ Thermal Shutdown

♦ Adjustable Soft-Start Inrush Current Limiting

♦ 100% Duty Cycle During Low-Dropout Operation

♦ Output Short-Circuit Protection

The MAX1742/MAX1842 use a unique current-mode,

constant-off-time, PWM control scheme, which includes

Idle Mode™ to maintain high efficiency during light-load

operation. The programmable constant-off-time architec-

ture sets switching frequencies up to 1MHz, allowing the

user to optimize performance trade-offs between effi-

ciency, output switching noise, component size, and

cost. Both devices are designed for continuous output

currents up to 1A. The MAX1742 uses a peak current

limit of 1.3A (min) and is suitable for applications requir-

ing small external component size and high efficiency.

The MAX1842 has a higher current limit of 3.1A (min)

and is intended for applications requiring an occasional

burst of output current up to 2.7A. Both devices also fea-

ture an adjustable soft-start to limit surge currents during

startup, a 100% duty cycle mode for low-dropout opera-

tion, and a low-power shutdown mode that disconnects

the input from the output and reduces supply current

below 1µA. The MAX1742/MAX1842 are available in 16-

pin QSOP packages.

♦ 16-Pin QSOP Package

Ordering Information

PART

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

MAX1742EEE

MAX1742EEE+

MAX1842EEE

MAX1842EEE+

16 QSOP

For similar devices that provide continuous output cur-

rents up to 2A and 3A, refer to the MAX1644 and

MAX1623 data sheets.

+ Denotes lead-free package.

Applications

5V or 3.3V to Low-Voltage Conversion

CPU I/O Ring

Typical Configuration

OUTPUT

INPUT

3V TO

5.5V

1.1V TO

Chipset Supplies

10Ω

MAX1742

MAX1842

Notebook and Subnotebook Computers

PGND

GND

FBSEL

REF

470pF

2.2μF

SHDN

COMP

TOFF

Pin Configuration appears at end of data sheet.

1μF

Idle Mode is a trademark of Maxim Integrated Products.

0.01μF

________________________________________________________________ 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...16

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与MAX1742_05相关器件

型号	品牌	获取价格	描述	数据表
MAX1742EEE	MAXIM	获取价格	1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches
MAX1742EEE+	MAXIM	获取价格	1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches
MAX1742EEE-T	MAXIM	获取价格	暂无描述
MAX1742-MAX1842	MAXIM	获取价格	1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches
MAX1743	MAXIM	获取价格
MAX17435	MAXIM	获取价格	High-Frequency, Low-Cost SMBus Chargers
MAX17435	ADI	获取价格	高频、低成本SMBus电池充电器
MAX17435ETG+	MAXIM	获取价格	High-Frequency, Low-Cost SMBus Chargers
MAX17435ETG+T	MAXIM	获取价格	Power Management Circuit, BICMOS, PQCC24,
MAX1743CHG	MAXIM	获取价格	DC-to-DC Voltage Converter

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