1

2

3

4

5

6

7

8

9

10

11

12

13

REFIN

IOUT

LSET

VDD

VOS

SW

PGND

VIN

BOOTR

BOOT

PWM

EN/FCCM

TAO/FLT

3

CSD95490Q5MC

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SLPS669 – MARCH 2017

Product Folder Links: CSD95490Q5MC

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5 Pin Configuration and Functions

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Pin Functions

PIN

DESCRIPTION

NAME

NUMBER

REFIN

1

External reference voltage input for current sensing amplifier.

IOUT

2

Output of current sensing amplifier. V(IOUT) – V(REFIN) is proportional to the phase current.

LSET

3

A resistor from this pin to PGND pin sets the inductor value for the internal current sensing circuitry.

VDD

4

Supply voltage for gate drivers and internal circuitry.

VOS

5

Output voltage sensing pin for the internal current sensing circuitry.

SW

6

Phase node connecting the HS MOSFET source and LS MOSFET drain – pin connection to the output inductor.

VIN

7

Input voltage pin. Connect input capacitors close to this pin.

BOOTR

8

Return path for HS gate driver. It is connected to VSW internally.

BOOT

9

Bootstrap capacitor connection. Connect a minimum 0.1-µF, 16-V, X5R ceramic cap from BOOT to BOOTR pins.

The bootstrap capacitor provides the charge to turn on the control FET. The bootstrap diode is integrated.

PWM

10

Tri-state input from external controller. Logic low sets control FET gate low and sync FET gate high. Logic high

sets control FET gate high and sync FET gate low. Both MOSFET gates are set low if PWM stays in Hi-Z for

EN/FCCM

11

This dual function pin either enables the diode emulation function or can be used as a simple enable for the

device. When this pin is driven into the tri-state window and held there for more than the tri-state holdoff time,

Diode Emulation Mode (DEM) is enabled for sync FET. When the pin is high, device operates in Forced

Continuous Conduction Mode (FCCM). When the pin is low, both FETs are held off. An internal resistor pulls this

pin low if left floating.

TAO/FAULT

12

Temperature Amplifier Output. Reports a voltage proportional to the IC temperature. An ORing diode is

integrated in the IC. When used in multiphase application, a single wire can be used to connect the TAO pins of

all the ICs. Only the highest temperature will be reported. TAO will be pulled up to 3.3 V if thermal shutdown,

LSOC, or HSS detection circuit is tripped.

PGND

13

Power ground.