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參數資料
| 型號： | LM3370SD-3806 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function |
| 中文描述： | 1.4 A DUAL SWITCHING CONTROLLER, 2400 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4 X 5 MM, 0.8 MM HEIGHT, LLP-16 |
| 文件頁數： | 1/26頁 |
| 文件大小： | 5302K |
| 代理商： | LM3370SD-3806 |
January 4, 2008
LM3370
Dual Synchronous Step-Down DC-DC Converter with
Dynamic Voltage Scaling Function
General Description
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 I
2
C compatible interface. This dynamic volt-
age scaling function allows processors to achieve maximum
performance at the lowest power level. The I
2
C compatible
interface can also be used to control auto PFM-PWM/PWM
mode selection and other performance enhancing features.
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.
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.
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.
Default fixed voltages for the 2 output voltages combination
can be customized to fit system requirements by contacting
National Semiconductor Corporation.
Features
■
I
2
C 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 I
2
C
■
600 mA load per channel
■
2 MHz PWM fixed switching frequency (typ.)
■
Internal synchronous rectification for high efficiency
■
Internal soft start
■
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
■
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)
Applications
■
Baseband Processors
■
Application Processors (Video, Audio)
■
I/O Power
■
FPGA Power and CPLD
Typical Performance Curve
Efficiency vs. Output Current, V
OUT1
= 1.2V
Dimensions: 3.0 mm x 2.0 mm x 0.60 mm
2008 National Semiconductor Corporation
201673
www.national.com
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM3370SD-3806/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3370SD-4221 | 制造商:Texas Instruments 功能描述:Conv DC-DC Dual Step Down 2.7V to 5.5V 16-Pin LLP EP T/R 制造商:Texas Instruments 功能描述:DC-DC CONVERTER, STEP DOWN, LLP-16 |
| LM3370SD-4221/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3370SDX-3013 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function |
| LM3370SDX-3013/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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