ISL95876HRZ-T 데이터 시트보기 (PDF) - Intersil

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ISL95876HRZ-T

PWM DC/DC Controller with VID Inputs for Portable GPU Core-Voltage Regulator

Intersil 

ISL95874, ISL95875, ISL95876

ISL95875 Functional Pin Descriptions

PIN NUMBER

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

SYMBOL

DESCRIPTION

LGATE Low-side MOSFET gate driver output. Connect to the gate terminal of the low-side MOSFET of the converter.

PGND Return current path for the LGATE MOSFET driver. Connect to the source of the low-side MOSFET.

GND IC ground for bias supply and signal reference.

RTN

VID1

Negative remote sense input of VOUT. If resistor divider consisting of RFB and ROFS is used at FB pin, the same resistor

divider should be used at RTN pin, i.e. keep RFB1=RFB, and ROFS1=ROFS.

Logic input for setpoint voltage selector. Use in conjunction with the VID0 pin to select among four setpoint reference

voltages.

VID0

Logic input for setpoint voltage selector. Use in conjunction with the VID1 pin to select among four setpoint reference

voltages.

SREF

SET0

Soft-start and voltage slew-rate programming capacitor input and setpoint reference voltage programming resistor input.

Connects internally to the inverting input of the VSET voltage setpoint amplifier.

Voltage set-point programming resistor input.

SET1 Voltage set-point programming resistor input.

FB Voltage feedback sense input. Connects internally to the inverting input of the control-loop error transconductance

amplifier. The converter is in regulation when the voltage at the FB pin equals the voltage on the SREF pin.

OCSET

VO

Input for the overcurrent detection circuit. The overcurrent setpoint programming resistor ROCSET connects from this

pin to the sense node.

Output voltage sense input for the R4 modulator. The VO pin also serves as the reference input for the overcurrent

detection circuit.

FSEL

Input for programming the regulator switching frequency. Pull this pin to VCC for 1MHz switching. Pull this pin to GND

with a 100kΩ resistor for 600kHz switching. Leave this pin floating for 500kHz switching. Pull this pin directly to GND

for 300kHz switching.

PGOOD Power-good open-drain indicator output. This pin changes to high impedance when the converter is able to supply

regulated voltage.

EN

PHASE

Enable input for the IC. Pulling EN above the rising threshold voltage initializes the soft-start sequence.

Return current path for the UGATE high-side MOSFET driver, VIN sense input for the R4 modulator, and inductor current

polarity detector input.

UGATE High-side MOSFET gate driver output. Connect to the gate terminal of the high-side MOSFET of the converter.

BOOT Positive input supply for the UGATE high-side MOSFET gate driver. The BOOT pin is internally connected to the cathode

of the Schottky boot-strap diode. Connect an MLCC between the BOOT pin and the PHASE pin.

VCC Input for the IC bias voltage. Connect +5V to the VCC pin and decouple with at least a MLCC to the GND pin.

PVCC

Input for the LGATE and UGATE MOSFET driver circuits. The PVCC pin is internally connected to the anode of the Schottky

boot-strap diode. Connect +5V to the PVCC pin and decouple with a MLCC to the PGND pin.

8

FN7933.0

October 21, 2011

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