Datasheet > LM5121-Q1_15

LM5121-Q1_15

更新时间： 2024-09-30 01:22:47

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LM5121 Wide Input Synchronous Boost Controller with Disconnection Switch Control

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LM5121, LM5121-Q1

SNVS963B –SEPTEMBER 2013–REVISED DECEMBER 2014

LM5121 Wide Input Synchronous Boost Controller with Disconnection Switch Control

1 Features

2 Applications

•

AEC-Q100 Grade 1 (T_A= –40ºC to 125ºC)

Maximum Input Voltage: 65 V

•

12-V, 24-V, and 48-V Power Systems

Automotive Start-Stop

Min Input Voltage: 3.0 V (4.5 V for startup)

Output Voltage Up to 100 V

High Current Boost Power Supply

Battery Powered System

Bypass (V_OUT= V_IN) Operation

3 Description

1.2-V Reference with ±1.0% Accuracy

Free-Run/Synchronizable up to 1 MHz

Peak Current Mode Control

The LM5121 is a synchronous boost controller

intended for high-efficiency, high-power boost

regulator applications. The control method is based

upon peak current mode control. Current mode

control provides inherent line feed-forward, cycle-by-

cycle current limiting and ease of loop compensation.

Robust Integrated 3-A Gate Drivers

Adaptive Dead-Time Control

Optional Diode Emulation Mode

Programmable Cycle-by-Cycle Current Limit

Programmable Line UVLO

The switching frequency is programmable up to 1

MHz. Higher efficiency is achieved using two robust

N-channel MOSFET gate drivers with adaptive dead-

time control. A user-selectable diode emulation mode

enables discontinuous mode operation for improved

efficiency at light load conditions.

Programmable Soft-Start

Thermal Shutdown Protection

Low Shutdown Quiescent Current: 9 μA

Programmable Slope Compensation

The LM5121 provides disconnection switch control

which completely disconnects the output from the

input during an output short or a shutdown condition.

During start-up sequence, inrush current is limited by

the disconnection switch control.

Programmable Skip Cycle Mode Reduces

Standby Power

•

Supports External VCC Bias Supply Option

Load Disconnection in Shutdown Mode (True

Shutdown)

An internal charge pump allows 100% duty cycle

operation of the high-side synchronous switch

(Bypass operation). Additional features include

thermal shutdown, frequency synchronization, hiccup

mode current limit and adjustable line undervoltage

lockout.

•

Inrush Current Limiting

Hiccup Mode Short Circuit/Overload Protection

Circuit Breaker Function

Capable of Input Transient Suppression

Capable of Reverse Battery Protection

Thermally Enhanced 20-Pin HTSSOP

Device Information⁽¹⁾

PART NUMBER

LM5121

LM5121-Q1

PACKAGE

BODY SIZE (NOM)

HTSSOP (20)

6.50 mm x 4.40 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Simplified Application Diagram

OUT

VCC BST

COMP

CSN

CSP

RES

VIN

UVLO

MODE

PGND

AGND

SLOPE

SYNCIN/RT

LM5121

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...47

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LM5121QMH/NOPB	TI	获取价格	Wide Input Synchronous Boost Controller with Disconnection Switch Control
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LM5121QMHX/NOPB	TI	获取价格	Wide Input Synchronous Boost Controller with Disconnection Switch Control
LM5121QMHXNOPB	TI	获取价格	Wide Input Synchronous Boost Controller with Disconnection Switch Control
LM5122	TI	获取价格	Wide Input Synchronous Boost Controller with Multiple Phase Capability
LM5122MH/NOPB	TI	获取价格	Wide Input Synchronous Boost Controller with Multiple Phase Capability
LM5122MHE/NOPB	TI	获取价格	具有多相功能的 3-65V 宽输入电压、电流模式同步升压控制器 \| PWP \| 20 \|
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