LM3686

更新时间： 2024-11-15 05:42:03

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器稳压器
页数	文件大小	规格书
20页	1844K
描述
Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator

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LM3686 数据手册

December 17, 2008

LM3686

Step-Down DC-DC Converter with Integrated Post Linear

Regulators System and Low-Noise Linear Regulator

General Description

Features

The LM3686 is a step-down DC-DC converter with one inte-

grated very low dropout linear regulator and a low noise linear

regulator optimized for powering ultra-low voltage circuits

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

vides three outputs with combined load current up to 900 mA

over an input voltage range from 2.7V to 5.5V.

DC-DC REGULATOR

V_{OUT_DCDC}= 1.2V to 2.5V ( in 100 mV steps - factory

programmed )

■

600 mA maximum load capability (LILO = OFF)

■

3 MHz PWM fixed switching frequency (typ.)

The device offers superior features and performance for

many applications. Automatic intelligent switching between

PWM low-noise and PFM low-current mode offers improved

system control. During full-power operation, a fixed-frequency

3 MHz (typ.), PWM mode drives loads from ~70 mA to 600

mA max. Hysteretic PFM mode extends the battery life

through reduction of the quiescent current to 28 μA (typ.) at

light load and system standby. Internal synchronous rectifi-

cation provides high efficiency.

Automatic PFM/PWM mode switching

Internal synchronous rectification for high efficiency

Internal soft start

■

DUAL RAIL LINEAR REGULATOR: LILO

Load transients < 50 mV peak typ.

■

Line transients < 1 mV peak typ.

V_{OUT_LILO}= 0.7V to 2.0V ( in 50 mV steps - factory

programmed )

Three enable pins allow the separate operation of either the

DC-DC, post-regulation linear regulator or the linear regulator

alone. If the DC-DC is not enabled during startup of the post-

regulation linear regulator, a parallel small pass transistor

supplies the linear regulator from V_BATTwith maximal 50 mA.

In the combined operation where both enables are raised to-

gether, the small pass transistor is deactivated and the big

pass transistor provides 350 mA output current. In shutdown

mode (Enable pins pulled low), the device turns off and re-

duces battery consumption to 2.5 μA (typ.).

The LM3686 is available in a 12-bump micro SMD package.

A high-switching frequency of 3 MHz (typ.) allows the use of

a few tiny surface-mount components. Only six external sur-

face-mount components, an inductor and five ceramic capac-

itors, are required to establish a 15.66 mm²total solution size.

70 µA typical I_Qfrom V_{IN_LILO}

■

350 mA Maximum Load Capability (Large FET)

LINEAR REGULATOR: LDO

Load transients < 80 mV peak typ.

■

Line transients < 1 mV peak typ.

V_{OUT_LDO}= 1.5V to 3.3V ( in 100 mV steps - factory

programmed )

50 µA typical I_Q

■

300 mA Maximum Load Capability

COMBINED GLOBAL FEATURES

V_BATT≥ V_{OUT_LILO}+ 1.5V or 2.7V, whichever is higher

■

900 mA maximum combined load capability

Operates from a single Li-Ion cell or 3 cell NiMH/NiCd

batteries

Only six tiny surface-mount external components required

(one inductor, five ceramic capacitors)

■

12–bump micro SMD

■

100 µA Iq from V_BATT

15.66 mm²total solution size

Applications

Moblie TV

■

Hand-Held Radios

Personal Digital Assistants

Palm-top PCs

Portable Instruments

Battery-Powered Devices

Portable Personal Clients

300255

www.national.com

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与LM3686相关器件

型号	品牌	获取价格	描述	数据表
LM3686TL-AADW	NSC	获取价格	Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Line
LM3686TL-AADW	TI	获取价格	IC 1.375 A SWITCHING REGULATOR, 3400 kHz SWITCHING FREQ-MAX, PBGA12, 0.50 MM PITCH, MICRO,
LM3686TLE-AADW	TI	获取价格	IC,SMPS CONTROLLER,VOLTAGE-MODE,BGA,12PIN,PLASTIC
LM3686TLE-AADW/NOPB	TI	获取价格	具有集成后置线性稳压器系统和低噪声线性稳压器的降压直流/直流转换器 \| YZR \| 12
LM3686TLE-AAED	NSC	获取价格	Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Line
LM3686TLE-AAEF	NSC	获取价格	Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Line
LM3686TLX-AADW	NSC	获取价格	Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Line
LM3686TLX-AAED	NSC	获取价格	Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Line
LM3686TLX-AAEF	NSC	获取价格	Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Line
LM3687	NSC	获取价格	Step-Down DC-DC Converter with Integrated Low Dropout Regulator and Startup Mode

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