Datasheet > LM3691

LM3691

更新时间： 2024-11-16 11:11:19

品牌	Logo	应用领域
德州仪器 - TI		便携式转换器
页数	文件大小	规格书
29页	2487K
描述
用于便携式应用的高准确度、微型 1A、降压直流/直流转换器

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LM3691

SNVS506J –MAY 2008–REVISED DECEMBER 2015

LM3691 High-Accuracy, Miniature 1-A Step-Down DC-DC Converter

for Portable Applications

1 Features

3 Description

The LM3691 step-down DC-DC converter is

optimized for powering ultra-low-voltage circuits from

a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It

provides up to 1-A load current over an input voltage

range from 2.3 V to 5.5 V. There are several different

fixed voltage output options available.

•

Input Voltage: 2.3 V to 5.5 V

Output Voltage: 0.75 V to 3.3 V

±1% DC Output Voltage Precision

4-MHz Switching Frequency

64-μA (typical) Quiescent Current in ECO Mode

1-A Maximum Load Capability

The LM3691 has a mode-control pin that allows the

user to select Forced PWM mode or ECO mode that

changes modes between gated PWM mode and

PWM automatically, depending on the load. In ECO

mode, the device offers superior efficiency and very

low I_Qunder light load conditions. ECO mode extends

the battery life through reduction of the quiescent

current during light load conditions and system

standby.

Automatic ECO/PWM Mode Switching

MODE Pin to Select ECO/Forced PWM Mode

Current Overload and Thermal Shutdown

Protections

•

Only Three Tiny Surface-Mount External

Components Required (Solution Size Less Than

15 mm²)

The LM3691 is available in a 6-pin DSBGA package.

Only three external surface-mount components, a

1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF

output capacitor, are required.

2 Applications

•

Mobile Phones

Hand-Held Radios

MP3 Players

Device Information⁽¹⁾

PART NUMBER

PACKAGE

BODY SIZE (MAX)

Portable Hard Disk Drives

LM3691

DSBGA (6)

1.59 mm × 1.295 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit

Efficiency vs. Output Current

(V_OUT= 1.8 V, ECO Mode)

V_IN

2.3 V to 5.5 V

V_OUT

C_OUT

100

C_IN

LM3691

= 2.3V

GND

MODE

= 3.6V

= 4.2V

0.1

100

1000

OUTPUT CURRENT (mA)

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...29

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LM3691 替代型号

型号	品牌	替代类型	描述	数据表
LM8801	TI	功能相似	High Precision 6MHz, 600 mA Synchronous Step-Down DC-DC Converter for Mobile Applications

与LM3691相关器件

型号	品牌	获取价格	描述	数据表
LM3691TL-0.75	NSC	获取价格	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
LM3691TL-0.75/NOPB	TI	获取价格	用于便携式应用的高准确度、微型 1A、降压直流/直流转换器 \| YZR \| 6 \| -30
LM3691TL-0.85	NSC	获取价格	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
LM3691TL-0.9	NSC	获取价格	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
LM3691TL-075	NSC	获取价格	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
LM3691TL-085	NSC	获取价格	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
LM3691TL-09	NSC	获取价格	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
LM3691TL-1.0	NSC	获取价格	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications
LM3691TL-1.0/NOPB	TI	获取价格	用于便携式应用的高准确度、微型 1A、降压直流/直流转换器 \| YZR \| 6
LM3691TL-1.1	NSC	获取价格	High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications

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