ISL6174IRZ【PDF 4/16 页】IC CIRC BREAKER DUAL LV 28-QFN

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Sheet目录40

1页 2页 3页 [4页]5页 6页 7页 8页

FN6830.0

December 19, 2008

BIAS

Chip Bias Voltage

Provides IC Bias. Should be 2V to 4V for IC to function normally. This pin can be powered from a

supply voltage that is not being controlled. It is preferable to use 3.3V even if the channels being

controlled are 2.5V or lower because more gate drive voltage will be available to the MOSFETs.

CPQ+ Charge Pump Capacitor

High Side

Flying cap highside. Use of 0.1礔 for 2.5V bias and 0.022礔 for 3.3V bias is recommended.

CPVDD Charge Pump Output This is the voltage used for some internal pull-ups and bias. Use of 0.47礔 (minimum) is

recommended.

TCB2

Timer Capacitor

Same function as pin 7

PG2

Power Good Output

Same function as pin 6

FLT2

Fault Output

Same as pin 5

GT2

Gate Drive Output

Same as pin 4

SS2

Soft-Start Duration Set

Input

Same as pin 3

VO2

Output Voltage 2

Same as pin 2

SNS2

Current Sense Input

Same as pin 1

VS2

Current Sense

Reference

Voltage input for one of the two voltages. Provides a 20礎 current source for the ISET series resistor

which sets the voltage to which the sense resistor IR drop is compared.

UV2

Undervoltage Monitor

Input

This pin is one of the two inputs to the undervoltage comparator. The other input is the 633mV

reference. It is meant to sense the output voltage through a resistor divider. If the output voltage

drops so that the voltage on the UV pin goes below 633mV, PG2

is deasserted.

EN2

Enable

This is an active low input. When asserted (pulled low), the SS and gate drive are released and the

output voltage gets enabled. When deasserted (pulled high or left floating), the reverse happens.

OCREF Ref. Current Adj.

Allows adjustment of the reference current through R

SET

and the internal Circuit Breaker set resistor,

thus setting the thresholds for CR, OC and WOC.

EN1

Enable Input

Same as pin 24

UV1

Undervoltage Monitor

Input

Same as pin 23

VS1

Current Sense

Reference

Same as pin 22

Pin Descriptions (Continued)

NAME

FUNCTION

DESCRIPTION

ISL6174

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