MIC2132 datasheet(17/48 Pages) MICROCHIP

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DS20006654B-page 17

MIC2132

SW1

Phase 1 Switch Node Output pin. Connect one terminal of the Phase 1 inductor to the SW1

node.

DL1

Phase 1 Low-Side Gate Driver Output pin. Connect DL1 to the Phase 1 low-side MOSFET gate.

PGND

Power Ground pin. PGND is the return path for the low-side MOSFET current and for the

low-side MOSFET driver. Connect all the PGND pins together and connect to the power

ground plane.

PVDD

PVDD is Supply pin for the Low-Side MOSFET Driver. Connect to VDD through a 2.2Ω

series resistor. Connect a minimum 4.7 µF low-ESR ceramic capacitor from PVDD to PGND.

DL2

Phase 2 Low-Side Gate Driver Output pin. Connect DL2 to the Phase 2 low-side MOSFET gate.

SW2

Phase 2 Switch Node Output pin. Connect one terminal of the Phase 2 inductor to the SW2

node.

DH2

Phase 2 High-Side Gate Driver Output Pin. Connect DH2 to the Phase 2 high-side MOSFET

gate.

BST2

Phase 2 Bootstrap Capacitor Connection pin. The BST2 pin is the supply voltage input for

the Phase 2 high-side MOSFET driver. Connect a 0.1 µF low-ESR ceramic capacitor

between the BST2 pin and the SW2 pin.

Open-Drain Power Good Output pin. PG is pulled to ground when the output voltage is

below 80% of the target voltage. Pull-up to VDD through a 10 kΩ resistor to set logic high

level when the output voltage is above 90% of the target voltage.

RIP_INJ

Ripple Injection Node pin. Connect series RC network from the RIP_INJ pin to FBS for

injecting sufficient ripple for stable operation. Also connect a prepositioning resistor from this

pin to AGND to set up the RIP_INJ pin voltage to its steady-state value. There is a 4.8 µA

pull-up current when High-Z to preposition the common point of RINJ and CINJ.

FBS

Remote Feedback Input pin. Connect to the midpoint of a resistor divider from the output

voltage to GFB to set the desired output voltage. Connect the FBS pin to VDD to configure

MIC2132 as secondary in multiphase configuration.

GFB

Ground Feedback Remote Sense pin. Connect Kelvin sense directly across the output

capacitor ground through the low-side FB resistor ground connection.

Soft Start Adjustment pin. Connect a capacitor from the SS pin to AGND to adjust the soft

start time. See more details in Section 4.5.5 “Soft Start”. Connect an optional resistor

across the SS pin to AGND for overshoot reduction during soft start.

FREQ

Frequency Programming Input pin. Connect to ground through a resistor set to the same

switching frequency for each phase.

DROOP

Analog Output DROOP pin. This pin is for implementing the “Adaptive Voltage Positioning”

feature. Connect a resistor from the DROOP pin to the feedback resistor divider. The

DROOP voltage is proportional with inductor current for load currents greater than 0A.

—

Exposed Pad pin. Connect it to AGND.

TABLE 3-1:

PIN FUNCTION TABLE (CONTINUED)

Number

Symbol

Description

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