Datasheet > LM3477

LM3477

更新时间： 2024-11-24 11:11:55

品牌	Logo	应用领域
德州仪器 - TI		开关控制器稳压器
页数	文件大小	规格书
35页	1198K
描述
用于开关稳压器的高效高侧 N 沟道控制器

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LM3477 数据手册

LM3477

www.ti.com

SNVS141K –OCTOBER 2000–REVISED MARCH 2013

LM3477 High Efficiency High-Side N-Channel Controller for Switching Regulator

Check for Samples: LM3477

FEATURES

DESCRIPTION

The LM3477/A is a high-side N-channel MOSFET

switching regulator controller. It can be used in

topologies requiring a high side MOSFET such as

buck, inverting (buck-boost) and zeta regulators. The

LM3477/A's internal push pull driver allows

compatibility with a wide range of MOSFETs. This,

the wide input voltage range, use of discrete power

components and adjustable current limit allows the

LM3477/A to be optimized for a wide variety of

applications.

•

500kHz Switching Frequency

Adjustable Current Limit

1.5% Reference

•

Thermal Shutdown

Frequency Compensation Optimized with a

Single Capacitor and Resistor

•

Internal Softstart

Current Mode Operation

Undervoltage Lockout with Hysteresis

8-lead (VSSOP-8) Package

The LM3477/A uses a high switching frequency of

500kHz to reduce the overall solution size. Current-

mode control requires only a single resistor and

capacitor for frequency compensation. The current

mode architecture also yields superior line and load

regulation and cycle-by-cycle current limiting. A 5µA

shutdown state can be used for power savings and

for power supply sequencing. Other features include

internal soft-start and output over voltage protection.

The internal soft-start reduces inrush current. Over

voltage protection is a safety feature to ensure that

the output voltage stays within regulation.

APPLICATIONS

•

Local Voltage Regulation

Distributed Power

Notebook and Palmtop Computers

Internet Appliances

Printers and Office Automation

Battery operated Devices

Cable Modems

The LM3477A is similar to the LM3477. The primary

difference between the two is the point at which the

device transitions into hysteretic mode. The hysteretic

threshold of the LM3477A is one-third of the LM3477.

Battery Chargers

Hysteretic Threshold⁽¹⁾

LM3477

≊ 36% of programmed current limit

≊ 12% of programmed current limit

LM3477A

(1) See Hysteretic Threshold and PROGRAMMING THE

CURRENT LIMIT/HYSTERETIC THRESHOLD for more

information.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...35

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LM3477 替代型号

型号	品牌	替代类型	描述	数据表
LM3485-Q1	TI	功能相似	汽车级 4.5V 至 35V、滞环非同步 PFET 降压控制器
LM3485	TI	功能相似	Hysteretic PFET Buck Controller

与LM3477相关器件

型号	品牌	获取价格	描述	数据表
LM3477A	NSC	获取价格	High Efficiency High-Side N-Channel Controller for Switching Regulator
LM3477AMM	NSC	获取价格	High Efficiency High-Side N-Channel Controller for Switching Regulator
LM3477AMM/NOPB	NSC	获取价格	IC 1 A SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8, Switching Regulato
LM3477AMM/NOPB	TI	获取价格	用于开关稳压器的高效高侧 N 沟道控制器 \| DGK \| 8 \| -40 to 125
LM3477AMMX	NSC	获取价格	High Efficiency High-Side N-Channel Controller for Switching Regulator
LM3477AMMX/NOPB	ROCHESTER	获取价格	1A SWITCHING CONTROLLER, 575kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8
LM3477AMMX/NOPB	TI	获取价格	用于开关稳压器的高效高侧 N 沟道控制器 \| DGK \| 8 \| -40 to 125
LM3477MM	NSC	获取价格	High Efficiency High-Side N-Channel Controller for Switching Regulator
LM3477MM/NOPB	NSC	获取价格	IC 1 A SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO8, MSOP-8, Switching Regulato
LM3477MM/NOPB	TI	获取价格	用于开关稳压器的高效高侧 N 沟道控制器 \| DGK \| 8 \| -40 to 125

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