Datasheet > LM3668SDX-3034

LM3668SDX-3034

更新时间： 2024-09-26 04:44:23

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器电感器开关光电二极管
页数	文件大小	规格书
18页	4233K
描述
1A, High Efficiency Dual Mode Single Inductor Buck-Boost DC/DC Converter

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LM3668SDX-3034 数据手册

March 21, 2008

LM3668

1A, High Efficiency Dual Mode Single Inductor Buck-Boost

DC/DC Converter

General Description

The LM3668 is a synchronous 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 the output

voltage range. The LM3668 regulates the output voltage over

the complete input voltage range by automatically switching

between buck or boost modes depending on the input volt-

age.

Features

45µA typical quiescent current

■

For 2.8V/3.3V and 3.0/3.4V versions:

- 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

For 4.5/5V

■

- 1A maximum load current for V_IN= 3.9V to 5.5V

- 800mA maximum load current for V_IN= 3.4V to 3.8V

- 700mA maximum load current for V_IN= 3.0V to 3.3V

- 600mA maximum load current for V_IN= 2.7V to 2.9V

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 45µA (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 0.01µA

(typ.).

2.2MHz PWM fixed switching frequency (typ.)

■

Automatic PFM-PWM Mode or Forced PWM Mode

Wide Input Voltage Range: 2.5V to 5.5V

Internal synchronous rectification for high efficiency

Internal soft start: 600µs Maximum start-up time after V_IN

settled

■

0.01µA typical shutdown current

■

Current overload and Thermal shutdown protection

Frequency Sync Pin: 1.6MHz to 2.7MHz

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 2.2µH inductor, a

10µF input capacitor, and a 22µF output capacitor.

Applications

Handset Peripherals

■

MP3 players

Pre-Regulation for linear regulators

PDAs

Portable Hard Disk Drives

■

WiMax Modems

■

Typical Applications

20191401

Typical Application Circuit

20191476

Efficiency at 3.3V Output

201914

www.national.com

12 3 4 5 6 7...18

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与LM3668SDX-3034相关器件

型号	品牌	获取价格	描述	数据表
LM3668SDX-4550	NSC	获取价格	1A, High Efficiency Dual Mode Single Inductor Buck-Boost DC/DC Converter
LM3670	NSC	获取价格	Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670	TI	获取价格	用于超低电压电路的微型降压直流/直流转换器
LM3670_06	NSC	获取价格	Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670_16	TI	获取价格	Miniature Step-Down DC-DC Converter for Ultralow Voltage Circuits
LM3670MF-1.2	NSC	获取价格	Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670MF-1.2	TI	获取价格	0.75A SWITCHING REGULATOR, 1300kHz SWITCHING FREQ-MAX, PDSO5, SOT-23, 5 PIN
LM3670MF-1.2/NOPB	NSC	获取价格	IC 0.75 A SWITCHING REGULATOR, 1300 kHz SWITCHING FREQ-MAX, PDSO5, ROHS COMPLIANT, SOT-23,
LM3670MF-1.2/NOPB	TI	获取价格	LM3670 Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670MF-1.5	NSC	获取价格	Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits

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