Datasheet > LM3661_05

LM3661_05

更新时间： 2024-11-14 04:44:23

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器
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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LM3661_05 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LM3661_05相关器件

型号	品牌	获取价格	描述	数据表
LM3661AM	NSC	获取价格	LM3361A Low Voltage/Power Narrow Band FM IF System
LM3661TL-1.25	NSC	获取价格	450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
LM3661TL-1.25	TI	获取价格	0.454A SWITCHING REGULATOR, 675kHz SWITCHING FREQ-MAX, PBGA10, MICRO SMD-10
LM3661TL-1.35	NSC	获取价格	450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
LM3661TL-1.35	TI	获取价格	0.65A SWITCHING REGULATOR, 675kHz SWITCHING FREQ-MAX, PBGA10, MICRO SMD-10
LM3661TL-1.40	NSC	获取价格	450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
LM3661TL-1.40	TI	获取价格	0.65A SWITCHING REGULATOR, 675kHz SWITCHING FREQ-MAX, PBGA10, MICRO SMD-10
LM3661TLX-1.25	TI	获取价格	IC 0.454 A SWITCHING REGULATOR, 675 kHz SWITCHING FREQ-MAX, PBGA10, MICRO SMD-10, Switchin
LM3661TLX-1.25	NSC	获取价格	450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
LM3661TLX-1.35	NSC	获取价格	450mA Subminiature, Micropower Step-Down DC-DC Converter for Ultra Low-Voltage Circuits

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