Datasheet > LM3661TLX-1.25

LM3661TLX-1.25

更新时间： 2024-09-26 03:51:47

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器开关
页数	文件大小	规格书
17页	842K
描述
450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits

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LM3661TLX-1.25 数据手册

May 2005

LM3661

450mA Subminiature, Micropower Step-Down DC-DC

Converter for Ultra Low-Voltage Circuits

3% output voltage precision in PWM mode

General Description

n Miniature 10-pin micro SMD package

n Only three tiny surface-mount external components

required

n Uses small ceramic capacitors

n 8 mV typ. PWM output voltage ripple

The LM3661 step-down DC-DC converter is optimized for

powering ultra-low voltage circuits from a single Lithium-Ion

cell. The device provides two pin-selectable output voltages.

See ordering information for a list of voltage options avail-

able . This allows adjustment for DSP or CPU voltage op-

tions, as well as dynamic output voltage switching for re-

n Internal synchronous rectification for high efficiency

(92% at 2.7 V_IN, 1.35 V_OUT

)

duced

power

consumption.

Internal

synchronous

rectification provides high efficiency (92% typ. at 1.35V_OUT).

n 29 µA typ. quiescent current (Linear mode)

n 0.5 µA typ. shutdown current

n SYNC/MODE input for frequency synchronization from

500 kHz to 750 kHz

n Current and Thermal overload protection

n High gain control loop with internal compensation

n Up to 450mA I_OUTcapability for LM3661-1.35/1.4

n Up to TBDmA I_OUTcapability for LM3661-1.25

The LM3661 offers superior features and performance for

mobile phones and similar portable applications. Pin-

selectable PWM and Linear modes provide improved system

control for maximizing battery life. During full-load, fixed

frequency PWM operation reduces interference in RF and

data acquisition applications by minimizing noise harmonics

at sensitive IF and sampling frequencies. The SYNC/MODE

input allows synchronization of the switching frequency in a

range of below 500 kHz to 750 kHz to prevent noise from

intermodulation with system frequencies. Linear operation

reduces quiescent current to 29 µA (typ.) during system

standby for extended battery life, while supplying up to

15 mA. Shutdown turns the device off and reduces battery

consumption to 0.5 µA (typ.). This device offers a selectable

over Current Limit to protect a variety of inductors.

Applications

n Mobile phones

n Hand-Held radios

n Personal Digital Assistants

n Palm-top PC’s and Pocket PC’s

n Portable Instruments

n Battery Powered Device

The LM3661 is available in a 10 pin micro SMD package.

This packaging uses National’s chip-scale micro SMD tech-

nology and offers the smallest possible size. A high (600

kHz) switching frequency allows use of tiny surface-mount

components; only three are required—an inductor and two

ceramic capacitors.

Features

n Operates from a single Li-ION cell

n Pin selectable output voltages

n Pin selectable Inductor Current Limit

Typical Application Circuit

20098802

DS200988

www.national.com

12 3 4 5 6 7...17

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与LM3661TLX-1.25相关器件

型号	品牌	获取价格	描述	数据表
LM3661TLX-1.35	NSC	获取价格	450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
LM3661TLX-1.35	TI	获取价格	IC 0.65 A SWITCHING REGULATOR, 675 kHz SWITCHING FREQ-MAX, PBGA10, MICRO SMD-10, Switching
LM3661TLX-1.40	NSC	获取价格	450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
LM3661TLX-1.40	TI	获取价格	0.65A SWITCHING REGULATOR, 675kHz SWITCHING FREQ-MAX, PBGA10, MICRO SMD-10
LM3668	NSC	获取价格	1A, High Efficiency Dual Mode Single Inductor Buck-Boost DC/DC Converter
LM3668	TI	获取价格	1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter
LM3668_08	NSC	获取价格	1A, High Efficiency Dual Mode Single Inductor Buck-Boost DC/DC Converter
LM3668_0809	NSC	获取价格	1A, High Efficiency Dual Mode Single Inductor Buck-Boost DC/DC Converter
LM3668_15	TI	获取价格	1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter
LM3668-Q1	TI	获取价格	1A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter

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