LTC4366 datasheet(10/32 Pages) AD

10 / 32 page

LTC7862

Rev 0

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DRVUV (Pin 16/Pin 18): DRVCC Regulation and UVLO

Program Pin. This pin sets the regulated output voltage

of the DRVCC linear regulator. Tying this pin to GND sets

DRVCC to 6.0V. Tying this pin to INTVCC sets DRVCC to

9V. This pin also determines the higher or lower DRVCC

UVLO and EXTVCC switchover thresholds, as listed on

the Electrical Characteristics table. Connecting DRVUV to

GND chooses the lower thresholds whereas tying DRVUV

to INTVCC chooses the higher thresholds. Do not float

this pin.

INTVCC (Pin 17/Pin 19): Output of the Internal 5V Low

Dropout Regulator. Many of the low voltage analog and

digital circuits are powered from this voltage source. A

low ESR 0.1µF ceramic bypass capacitor should be con-

nected between INTVCC and GND, as close as possible to

the LTC7862.

OVLO (Pin 18/Pin 20): Overvoltage Lockout Input. A

voltage on this pin above 1.2V disables switching of

the controller. The DRVCC and INTVCC supplies maintain

regulation during an OVLO event. Exceeding the OVLO

threshold triggers a soft-start reset. If the OVLO function

is not used, connect this pin to GND.

SENSE+ (Pin 19/Pin 1): The (+) Input to the Differential

Current Comparator. The ITH pin voltage and controlled

offsets between the SENSE– and SENSE+ pins in conjunc-

tion with RSENSE set the current trip threshold.

SENSE– (Pin 20/Pin 2): The (–) Input to the Differential

Current Comparator. When SENSE– is greater than INTVCC,

the SENSE– pin supplies power to the current comparator.

PIN FUNCTIONS (QFN/TSSOP)

TIMING DIAGRAM

7862 TD

TMR

COOLDOWN

DROPOUT

WARNB

SWITCHING OFF

40µA PULL-UP CURRENT

1.1µA PULL-DOWN CURRENT

(NOT TO SCALE)

2.19V

250mV

SWITCHING

VIN SURGE

VIN SURGE GOES AWAY

SWITCHING OFF

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