Datasheet > LM3370SD-3021

LM3370SD-3021

更新时间： 2024-11-20 02:52:39

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
26页	5408K
描述
Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function

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LM3370SD-3021 数据手册

January 4, 2008

LM3370

Dual Synchronous Step-Down DC-DC Converter with

Dynamic Voltage Scaling Function

General Description

Features

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

for powering ultra-low voltage circuits from a single Li-Ion bat-

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

outputs with 600 mA load per channel. The output voltage

range varies from 1V to 3.3V and can be dynamically con-

trolled using the I²C compatible interface. This dynamic volt-

age scaling function allows processors to achieve maximum

performance at the lowest power level. The I²C compatible

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

mode selection and other performance enhancing features.

I²C compatible interface

■

V_OUT1= 1V to 2V in 50 mV steps

—

V_OUT2= 1.8V to 3.3V in 100 mV steps

Automatic PFM/PWM mode switching & Forced PWM

mode for low noise operation

Spread Spectrum capability using I²C

—

600 mA load per channel

■

2 MHz PWM fixed switching frequency (typ.)

Internal synchronous rectification for high efficiency

Internal soft start

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 further external de-

vices.

Power-on-reset function for both outputs

2.7V ≤ V_IN≤ 5.5V

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

batteries and 3.3V/5.5V fixed rails

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

per channel

■

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

the output voltage to avoid unexpected power losses. The in-

dependent enable pin for each output allows for simple and

effective power sequencing.

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

■

20-Bump micro SMD Package (3.0 mm x 2.0 mm x 0.6

mm)

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

LLP and a 20-Bump micro SMD, 3.0 mm x 2.0 mm x 0.6 mm,

package. A high switching frequency—2 MHz (typ)—allows

use of tiny surface-mount components including a 2.2 µH in-

ductor.

Applications

Baseband Processors

■

Application Processors (Video, Audio)

I/O Power

Default fixed voltages for the 2 output voltages combination

can be customized to fit system requirements by contacting

National Semiconductor Corporation.

FPGA Power and CPLD

■

Typical Performance Curve

20167379

Dimensions: 3.0 mm x 2.0 mm x 0.60 mm

Efficiency vs. Output Current, V_OUT1=²1⁰¹.⁶2⁷V³⁸¹

201673

www.national.com

12 3 4 5 6 7...26

中文翻译

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与LM3370SD-3021相关器件

型号	品牌	获取价格	描述	数据表
LM3370SD-3021/NOPB	TI	获取价格	具有动态电压调节功能的双路同步降压直流/直流转换器 \| NHR \| 16 \| -30 to
LM3370SD-3416	NSC	获取价格	Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function
LM3370SD-3416/NOPB	TI	获取价格	具有动态电压调节功能的双路同步降压直流/直流转换器 \| NHR \| 16 \| -30 to
LM3370SD-3621	NSC	获取价格	Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function
LM3370SD-3621/NOPB	TI	获取价格	Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function 16-WSON
LM3370SD-3806	NSC	获取价格	Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function
LM3370SD-3806/NOPB	TI	获取价格	Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function 16-WSON -
LM3370SD-4221	NSC	获取价格	Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function
LM3370SD-4221/NOPB	TI	获取价格	具有动态电压调节功能的双路同步降压直流/直流转换器 \| NHR \| 16 \| -30 to
LM3370SDX-3013	NSC	获取价格	Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function

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