Datasheet > MAX1921

MAX1921

更新时间： 2024-12-02 14:57:51

品牌	Logo	应用领域
亚德诺 - ADI		DC-DC转换器
页数	文件大小	规格书
12页	1919K
描述
低电压、400mA、降压型DC-DC转换器，SOT23封装

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中文翻译

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MAX1921 数据手册

MAX1920/MAX1921

Low-Voltage, 400mA Step-Down

DC-DC Converters in SOT23

General Description

Features

● 400mA Guaranteed Output Current

The MAX1920/MAX1921 step-down converters deliver

over 400mA to outputs as low as 1.25V. These converters

use a unique proprietary current-limited control scheme

that achieves over 90% efficiency. These devices maintain

extremely low quiescent supply current (50μA), and their

high 1.2MHz (max) operating frequency permits small,

low-cost external components. This combination makes

the MAX1920/MAX1921 excellent high-efficiency alterna-

tives to linear regulators in space-constrained applications.

● Internal Synchronous Rectifier for > 90% Efficiency

● Tiny 6-Pin SOT23 Package

● Available in 6-Pin TDFN Package (MAX1920)

● Up to 1.2MHz Switching Frequency for Small

External Components

● 50μA Quiescent Supply Current

● 0.1μA Logic-Controlled Shutdown

● 2V to 5.5V Input Range

Internal synchronous rectification greatly improves effi-

ciency and eliminates the external Schottky diode required

in conventional step-down converters. Both devices also

include internal digital soft-start to limit input current upon

startup and reduce input capacitor requirements.

● Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output

Voltages (MAX1921)

● Adjustable Output Voltage (MAX1920)

● ±1.5% Initial Accuracy

The MAX1920 provides an adjustable output voltage

(1.25V to 4V). The MAX1921 provides factory-preset

output voltages (see the Selector Guide). Both are

available in space-saving 6-pin SOT23 packages. The

MAX1920 is also available in a 6-pin TDFN package.

● Soft-Start Limits Startup Current

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX1920EUT-T

MAX1920EUT+T

MAX1920ETT-T

MAX1920ETT+T

MAX1921EUT_ _-T

MAX1921EUT_ _+T

-40°C to +85°C 6 SOT23-6

-40°C to +85°C 6 TDFN

-40°C to +85°C 6 SOT23-6

Applications

● Next-Generation Wireless Handsets

● PDAs, Palmtops, and Handy-Terminals

● Battery-Powered Equipment

● CDMA Power Ampliﬁer Supply

Note: The MAX1921 offers five preset output voltage options.

See the Selector Guide, and then insert the proper designator

into the blanks above to complete the part number.

+Denotes a lead-free package.

Pin Conﬁguration

Typical Operating Circuit

TOP VIEW

INPUT

2V TO 5.5V

OUTPUT

1.5V UP TO 400mA

•

4.7µH

AGND

SHDN

PGND

OUT

4.75kΩ

5600pF

4.7µF

MAX1920

MAX1921

MAX1920

PGND

OUT (FB)

AGND

SHDN

•

SOT23-6

OFF

TDFN

( ) ARE FOR MAX1920 ONLY

A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.

19-2296; Rev 3; 8/05

12 3 4 5 6 7...12

中文翻译

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与MAX1921相关器件

型号	品牌	获取价格	描述	数据表
MAX1921EUT	MAXIM	获取价格	PLASTIC ENCAPSULATED DEVICES
MAX1921EUT15	MAXIM	获取价格	SMPS Controller
MAX1921EUT15+T	ROCHESTER	获取价格	0.95A SWITCHING REGULATOR, 1200kHz SWITCHING FREQ-MAX, PDSO6, LEAD FREE, MO-178AB, SOT-23,
MAX1921EUT15-T	MAXIM	获取价格	Analog IC
MAX1921EUT18	MAXIM	获取价格	SMPS Controller
MAX1921EUT18+T	MAXIM	获取价格	Switching Regulator, Current-mode, 0.95A, 1200kHz Switching Freq-Max, PDSO6, LEAD FREE, MO
MAX1921EUT18-T	MAXIM	获取价格	Analog IC
MAX1921EUT18-T	ROCHESTER	获取价格	0.95A SWITCHING REGULATOR, 1200kHz SWITCHING FREQ-MAX, PDSO6, MO-178AB, SOT-23, 6 PIN
MAX1921EUT25	MAXIM	获取价格	SMPS Controller
MAX1921EUT25	ROCHESTER	获取价格	0.95A SWITCHING REGULATOR, 1200kHz SWITCHING FREQ-MAX, PDSO6, MO-178AB, SOT-23, 6 PIN

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