LM5149RGYR中文資料德州儀器數(shù)據(jù)手冊PDF規(guī)格書

1 Features

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? Two integrated EMI mitigation mechanisms

– Active EMI Filter for enhanced EMI

performance at lower frequencies

– Selectable dual random spread spectrum

(DRSS) for enhanced EMI performance across

low and high-frequency bands

– EMI reduced by an average of 25 dBμV

– Reduces the external differential-mode input

filter size by 50 and lowers systems cost

– Optimized for CISPR 32 Class B requirements

? Versatile synchronous buck DC/DC controller

– Wide input voltage range of 3.5 V to 80 V

– 1 accurate, fixed 3.3 V, 5 V, 12 V, or

adjustable output from 0.8 V to 55 V

– 150°C maximum junction temperature

– Shutdown mode current: 2.3 μA

– No-load sleep current: 9.5 μA

– Stackable up to two phases

– Advanced dropout with frequency foldback

? Switching frequency from 100 kHz to 2.2 MHz

– SYNC in and SYNC out capability

? Inherent protection features for robust design

– Internal hiccup-mode overcurrent protection

– ENABLE and PGOOD functions

– VCC, VDDA, and gate-drive UVLO protection

– Internal or external loop compensation

– Thermal shutdown protection with hysteresis

? Create a custom design using the LM5149 with

WEBENCH? Power Designer

2 Applications

? Building automation

? Industrial transport

? Wireless infrastucture

? Test and measurement

3 Description

The LM5149 is a 80-V, ultra-low IQ synchronous

buck DC/DC controller for high-current, single-output

applications. The controller uses a peak current-mode

control architecture for easy loop compensation,

fast transient response, and excellent load and line

regulation. The LM5149 can be set up in interleaved

dual-phase mode with accurate current sharing for

high-current applications. The device can operate with

VIN as low as 3.5 V, at nearly 100 duty cycle if

needed.

The LM5149 has two unique EMI reduction features:

active EMI filter and dual random spread spectrum

(DRSS). The active EMI filter senses any noise

or ripple voltage on the DC input bus and injects

an out-of-phase cancellation signal to reduce the

disturbance. DRSS combines low-frequency triangular

and high-frequency randomized modulations to

mitigate EMI across lower and higher frequency

bands, respectively. This hybrid technique aligns with

the multiple resolution bandwidth (RBW) settings

specified in industry-standard EMC tests.