Datasheet > LM2742

LM2742

更新时间： 2024-11-26 02:58:27

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描述
N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages

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LM2742 数据手册

LM2742

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SNVS266C –MARCH 2004–REVISED MARCH 2013

LM2742 N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages

Check for Samples: LM2742

FEATURES

DESCRIPTION

The LM2742 is a high-speed, synchronous, switching

regulator controller. It is intended to control currents

of 0.7A to 20A with up to 95% conversion efficiencies.

Power up and down sequencing is achieved with the

power-good flag, adjustable soft-start and output

enable features. The LM2742 operates from a low-

current 5V bias and can convert from a 1V to 16V

•

Input Power from 1V to 16V

•

Output Voltage Adjustable down to 0.6V

Power Good Flag, Adjustable Soft-start and

Output Enable for Easy Power Sequencing

•

Reference Accuracy: 1.5% (0°C–125°C)

Current Limit Without Sense Resistor

Soft Start

power rail. The part utilizes

a fixed-frequency,

voltage-mode, PWM control architecture and the

switching frequency is adjustable from 50kHz to

2MHz by setting the value of an external resistor.

Current limit is achieved by monitoring the voltage

drop across the on-resistance of the low-side

MOSFET, which enables on-times on the order of

40ns, one of the best in the industry. The wide range

of operating frequencies gives the power supply

designer the flexibility to fine-tune component size,

cost, noise and efficiency. The adaptive, non-

overlapping MOSFET gate-drivers and high-side

bootstrap structure helps to further maximize

efficiency. The high-side power FET drain voltage can

be from 1V to 16V and the output voltage is

adjustable down to 0.6V.

Switching Frequency from 50 kHz to 2 MHz

40ns Typical Minimum On-time

TSSOP-14 Package

APPLICATIONS

•

POL Power Supply Modules

Cable Modems

Set-Top Boxes/ Home Gateways

DDR Core Power

High-Efficiency Distributed Power

Local Regulation of Core Power

TYPICAL APPLICATION

+5V

V_IN= 3.3V

C_BOOT

0.1m

R_IN

C_IN1,2

Si4884DY

10W

10 mF

6.3V

1.5 mH

6.1A, 9.6 mW

C_IN

2.2 mF

BOOT

R_CS

V_O= 1.2V@5A

PWGD

FREQ

R_FADJ

SEN

Si4884DY

2.2k

LM2742

PGND

C_O1,2

63.4k

C_SS

12n

fb2

10k

2200 mF

6.3V, 2.8A

SGND

EAO

fb1

10k

C_C1

R_C1

392k

C_C2

180p

2.2p

Figure 1. Typical Application Circuit

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...33

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LM2742 替代型号

型号	品牌	替代类型	描述	数据表
LM2737	TI	功能相似	LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller for Low Output
LM27403	TI	功能相似	Synchronous Buck Controller with Temperature-Compensated, Inductor-DCR-Based Overcurrent P

与LM2742相关器件

型号	品牌	获取价格	描述	数据表
LM2742_15	TI	获取价格	N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages
LM2742MTC	NSC	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO14, TSSOP-14, Switching Regulato
LM2742MTC/NOPB	TI	获取价格	N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages
LM2742MTCX	NSC	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO14, TSSOP-14, Switching Regulato
LM2742MTCX/NOPB	TI	获取价格	N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages
LM2743	TI	获取价格	LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
LM2743	NSC	获取价格	N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V
LM2743_14	TI	获取价格	Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
LM2743MTC	TI	获取价格	LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller
LM2743MTC	NSC	获取价格	N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V

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