LM2742MTCXSLASHNOPB.B中文资料德州仪器数据手册PDF规格书

1FEATURES

2• 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

• Switching Frequency from 50 kHz to 2 MHz

• 40ns Typical Minimum On-time

• TSSOP-14 Package

APPLICATIONS

• POL Power Supply Modules

• Cable Modems non•

Set-Top Boxes/ Home Gateways

• DDR Core Power

• High-Efficiency Distributed Power

• Local Regulation of Core Power

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 lowcurrent

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

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.