LM46002PWPT.B中文资料德州仪器数据手册PDF规格书

1 Features

1• 27-μA Quiescent current in regulation

• High efficiency at light load (DCM and PFM)

• Meets EN55022/CISPR 22 EMI standards

• Integrated synchronous rectification

• Adjustable frequency range: 200 kHz to 2.2 MHz

(500 kHz default)

• Frequency synchronization to external clock

• Internal compensation

• Stable with almost any combination of ceramic,

polymer, tantalum, and aluminum capacitors

• Power-good flag

• Soft start into prebiased load

• Internal soft start: 4.1 ms

• Extendable soft-start time by external capacitor

• Output voltage tracking capability

• Precision enable to program system UVLO

• Output short-circuit protection with hiccup mode

• Overtemperature thermal shutdown protection

• Create a custom design using the LM46002 with

the WEBENCH® Power Designer

2 Applications

• Industrial power supplies

• Telecommunications systems

• Sub-AM band automotive

• Commercial vehicle power supplies

• General-purpose wide VIN regulation

• High-efficiency point-of-load regulation

3 Description

The LM46002 regulator is an easy-to-use

synchronous step-down DC/DC converter capable of

driving up to 2 A of load current from an input voltage

ranging from 3.5 V to 60 V. The LM46002 provides

exceptional efficiency, output accuracy and drop-out

voltage in a very small solution size. An extended

family is available in various load current options and

36-V maximum input voltage in pin-to-pin compatible

packages, including LM46001, LM46000, LM43603,

LM43602, LM43601 and LM43600. Peak-currentmode

control is employed to achieve simple controlloop

compensation and cycle-by-cycle current

limiting. Optional features such as programmable

switching frequency, synchronization, power-good

flag, precision enable, internal soft start, extendable

soft start, and tracking provide a flexible and easy-touse

platform for a wide range of applications.

Discontinuous conduction and automatic frequency

reduction at light loads improve light load efficiency.

The family requires few external components. Pin

arrangement allows simple, optimum PCB layout.

Protection features include thermal shutdown, VCC

undervoltage lockout, cycle-by-cycle current limit, and

output short-circuit protection. The LM46002 device is

available in the 16-lead HTSSOP / PWP package

(6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead

pitch.