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| 型号： | LM3668SDX-3.3/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.05 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, DSO12 |
| 封装： | ROHS COMPLIANT, LLP-12 |
| 文件页数： | 1/20页 |
| 文件大小： | 2497K |
| 代理商： | LM3668SDX-3.3/NOPB |
July 2007
LM3668
1A, High Efficiency Dual Mode Single Inductor Buck-Boost
DC/DC Converter
General Description
The LM3668 is a synchornous buck-boost DC-DC converter
optimized for powering low voltage circuits from a Li-Ion bat-
tery and input voltage rails between 2.5V and 5.5V. It has the
capability to support up to 1A output current over a output
voltage range of 2.8V/3.3V. The LM3668 regulates the output
voltage over the complete input voltage range by automati-
cally switching between buck or boost modes depending on
the input voltage.
The LM3668 has 2 N-channel MOSFETS and 2 P-channel
MOSFETS arranged in a topology that provides continuous
operation through the buck and boost operating modes.
There is a MODE pin that allows the user to choose between
an intelligent automatic PFM-PWM mode operation and
forced PWM operation. During PWM mode, a fixed-frequency
2.2MHz (typ.) is used. PWM mode drives load up to 1A. Hys-
teretic PFM mode extends the battery life through reduction
of the quiescent current to 45A (typ.) at light loads during
system standby. Internal synchronous rectification provides
high efficiency. In shutdown mode (Enable pin pulled low) the
device turns off and reduces battery consumption to 0.01A
(typ.).
The LM3668 is available in a 12-pin LLP package. A high
switching frequency of 2.2MHz (typ.) allows the use of tiny
surface-mount components including a 2.2H inductor, a
10F input capacitor, and a 22F output capacitor.
Features
■ 45A typical quiescent current
■ 1A maximum load current for V
IN = 2.8V to 5.5V
■ 800mA maximum load current for V
IN = 2.7V
■ 600mA maximum load current for V
IN = 2.5V
■ 2.2 MHz PWM fixed switching frequency (typ.)
■ Automatic PFM-PWM Mode or Forced PWM Mode
■ Wide Input Voltage Range: 2.5V to 5.5V
■ Output Voltage Range: 2.8V/3.3V
■ Internal synchronous rectification for high efficiency
■ Internal soft start: 600s Maximum start-up time
■ 0.01A typical shutdown current
■ Current overload and Thermal shutdown protection
■ Frequency Sync Pin: 1.6Mhz to 2.7MHz
Applications
■ Handset Peripherals
■ MP3 players
■ Pre-Regulation for linear regulators
■ PDAs
■ Portable Hard Disk Drives
■ WiMax Modems
Typical Applications
20191401
Typical Application Circuit
20191425
Efficiency at 3.3V Output
2007 National Semiconductor Corporation
201914
www.national.com
LM3668
1A,
High
Efficiency
Dual
Mode
Single
Inductor
Buck-Boost
DC/DC
Converter
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3668SDX-4550 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1A, High Efficiency Dual Mode Single Inductor Buck-Boost DC/DC Converter |
| LM3668SDX-4550/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM3670 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| LM3670_06 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits |
| LM3670B-0250 WAF | 制造商:Texas Instruments 功能描述: |
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