LTC7813 datasheet(49/59 Pages) AD

Part #	LTC7813

Description	100V VIN and VOUT Synchronous 4-Switch Multiphase Buck-Boost DC/DC Controller

PDF	59 Pages

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49 / 59 page

Data Sheet

LT8210-1

analog.com

Rev. A

49 of 59

Figure 72. 2-Phase Current Sharing Application

Programming V

IN UVLO

A resistor divider from VIN to the EN/UVLO pin implements VIN undervoltage lockout (UVLO). The EN/UVLO falling

threshold is set at 1.35V with 100mV of hysteresis. The programmable UVLO threshold can be calculated using

Equation 19.

��− = 1.35 •

��1+��2

��2

(19)

Figure 73 shows the implementation of external shutdown control while still using the UVLO function. The NMOS

grounds the EN/UVLO pin when turned on and puts the LT8210-1 into shutdown with a quiescent current around

1µA. If the functionality of the EN/UVLO pin is not needed, connect to the VIN pin for always-on operation.

Figure 73. VIN UVLO Implementation Using the EN/UVLO Pin

–

IMON

100pF

RC1

RIMON

SNSP2

RSENSE2

FROM DC

POWER SUPPLY

TO DRAIN OF

SWITCH A

SNSN2

LT8210-1

INPUT

CURRENT

VC1

1.01V

PWGD

1.20V

gm =

600μA/V

RF C

CC1

CP1

VDD

RUN/STOP

CONTROL

(OPTIONAL)

EN/UVLO

GND

LT8210-1

VIN

LTC7813 Datasheet(PDF) 49 Page - Analog Devices

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