Datasheet > LM3370

LM3370

更新时间： 2022-01-15 09:00:43

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
23页	1958K
描述
Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function

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LM3370 数据手册

PRELIMINARY

December 2005

LM3370

Dual Synchronous Step-Down DC-DC Converter with

Dynamic Voltage Scaling Function

General Description

Features

n I²C compatible interface

LM3370 is a dual step-down DC-DC converter optimized for

powering an ultra-low voltage circuits from a single Li-Ion

battery and input rail ranging from 2.7V to 5.5V. It provides

two outputs with 600mA load per channel. The output volt-

age range varies from 1V to 3.3V and can be dynamically

controlled using the I²C compatible interface. This dynamic

voltage scaling function allows processors to achieve maxi-

mum performance at the lowest power level. The I²C com-

patible interface can also be used to control auto PFM-PWM/

PWM mode selection and other performance enhancing

features.

— V_OUT1= 1V to 2V in 50mV steps

— V_OUT2= 2.3V to 3.3V in 100mV steps

— Automatic PFM/PWM mode switching & Forced PWM

mode for low noise operation

— Spread Spectrum capability using I²C

n 600mA load per channel

n 2MHz PWM fixed switching frequency (typ.)

n Internal synchronous rectification for high efficiency

n Internal soft start

n Power-on-reset function for both outputs

The LM3370 offers superior features and performance for

portable systems with complex power management require-

ments. Automatic intelligent switching between PWM low-

noise and PFM low-current mode offers improved system

efficiency. Internal synchronous rectification enhances the

converter efficiency without the use of futher external device.

n 2.7V ≤ V_IN≤ 5.5V

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

batteries and 3.3V/5.5V fixed rails

n 2.2µH Inductor, 4.7µF Input and 10µF Output Capacitor

per channel

n 16-lead LLP Package (4mm x 5mm x 0.8mm)

There is a power-on-reset function that monitors the level of

the output voltage to avoid unexpected power losses. The

independent enable pin for each output allows for simple and

effective power sequencing.

Applications

n Baseband Processors

n Application Processors (Video, Audio)

n I/O Power

LM3370 is available in a 4mm by 5mm 16-lead non-pullback

LLP package.

high switching frequency—2MHz

(typ)—allows use of tiny surface-mount components includ-

ing a 2.2µH inductor.

n FPGA Power and CPLD

Default fixed voltages for the 2 voltage outputs can be

customized to fit system requirements by contacting National

Semiconductor Corporation.

DS201673

www.national.com

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