LTM4643 datasheet(13/32 Pages) LINER

部件名	LTM4643

功能描述	Ultrathin Quad 關Module Regulator with Configurable 3A Output Array

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制造商	LINER [Linear Technology]

网页	http://www.linear.com

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LTM4643

13

4643fb

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APPLICATIONS INFORMATION

towards the INTVCC voltage. When the TRACK/SS voltage

is below 0.6V, it will take over the internal 0.6V reference

voltage to control the output voltage. The total soft-start

time can be calculated as:

tSS = 0.6 •

CSS

2.5µA

where CSS is the capacitance on the TRACK/SS pin. Cur-

rent foldback and forced continuous mode are disabled

during the soft-start process.

Outputvoltagetrackingcanalsobeprogrammedexternally

using the TRACK/SS pin of each regulator channel. The

output can be tracked up and down with another regula-

tor. Figure 3 and Figure 4 show an example waveform

and schematic of a ratiometric tracking where the slave

regulator’s (VOUT2, VOUT3 and VOUT4) output slew rate is

proportional to the master’s (VOUT1).

Since the slave regulator’s TRACK/SS is connected to

the master’s output through a RTR(TOP)/RTR(BOT) resistor

divider and its voltage used to regulate the slave output

4643 F04

CH1

CSS

0.1µF

RFB1

13.3k

VIN

5V TO 20V

RTR2(TOP)

60.4k

CH2

RFB2

19.1k

CH3

RFB3

30.1k

CH4

RFB4

60.4k

RTR2(BOT)

13.3k

RTR3(TOP)

60.4k

RTR3(BOT)

13.3k

RTR4(TOP)

60.4k

RTR4(BOT)

13.3k

4643 F03

TIME

VOUT4 = 1.2V

VOUT3 = 1.8V

VOUT2 = 2.5V

VOUT1 = 3.3V

Figure 3. Output Ratiometric Tracking Waveform

Figure 4. Output Ratiometric Tracking Schematic

voltage when TRACK/SS voltage is below 0.6V, the slave

outputvoltageandthemasteroutputvoltageshouldsatisfy

the following equation during the start-up.

VOUT(SL) •

RFB(SL)

RFB(SL) + 60.4k

= VOUT(MA) •

RTR(BOT)

RTR(TOP) +RTR(BOT)

类似零件编号 - LTM4643

制造商	部件名	数据表	功能描述
Linear Technology	LTM4643	646Kb / 20P	15V, 4A Step-Up 關Module Regulator
Analog Devices	LTM4643	2Mb / 28P	Quad 40VIN Silent Switcher 關Module Regulator with Configurable 1.2A Output Array
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	LTM4643	2Mb / 28P	Quad 40VIN, Silent Switcher 關Module Regulator with Configurable 3A Output Array
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制造商	部件名	数据表	功能描述
Linear Technology	LTM4643EV	954Kb / 8P	Quad DC/DC 關Module Regulator with Configurable 3A Output Array
Analog Devices	LTM8060	2Mb / 28P	Quad 40VIN, Silent Switcher 關Module Regulator with Configurable 3A Output Array
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Linear Technology	LTM8001	469Kb / 28P	de36VIN, 5A 關Module Regulator with 5-Output Configurable LDO Array
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LTM4643 数据表(PDF) 13 Page - Linear Technology

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