Datasheet > MAX1921

MAX1921

更新时间： 2024-11-30 22:57:59

品牌	Logo	应用领域
美信 - MAXIM		转换器
页数	文件大小	规格书
9页	371K
描述
Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23

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MAX1921 数据手册

19-2296; Rev 1; 7/02

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 convert-

ers 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 combi-

nation makes the MAX1920/MAX1921 excellent high-

efficiency alternatives to linear regulators in space-

constrained applications.

ꢀ Internal Synchronous Rectifier for >90%

Efficiency

ꢀ Tiny 6-Pin SOT23 Package

ꢀ 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)

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.

ꢀ

1.5% Initial Accuracy

ꢀ Soft-Start Limits Startup Current

Ordering Information

Applications

PART

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

Next-Generation Wireless Handsets

PDAs, Palmtops, and Handy-Terminals

Battery-Powered Equipment

MAX1920EUT-T

MAX1921EUT_ _-T

6 SOT23-6

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.

CDMA Power Amplifier Supply

Typical Operating Circuit

Pin Configuration

INPUT

OUTPUT

4.7µH

TOP VIEW

2V TO 5.5V

1.5V UP TO 400mA

PGND

OUT

4.75kΩ

5600pF

4.7µF

AGND

SHDN

MAX1921

AGND

MAX1920

MAX1921

PGND

OUT (FB)

SHDN

OFF

SOT23-6

( ) ARE FOR MAX1920 ONLY

________________________________________________________________ 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...9

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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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