ISL6269A

7

FN9253.3

November 18, 2014

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Functional Pin Descriptions

GND (Bottom Pad)

Signal common of the IC. Unless otherwise stated, signals are

referenced to the GND pin, not the PGND pin.

VIN (Pin 1)

The VIN pin measures the converter input voltage which is a

required input to the R3™ PWM modulator. Connect across the

drain of the high-side MOSFET to the GND pin.

VCC (Pin 2)

The VCC pin is the input bias voltage for the IC. Connect +5V from

the VCC pin to the GND pin. Decouple with at least 1µF of a MLCC

capacitor from the VCC pin to the GND pin.

FCCM (Pin 3)

The FCCM pin configures the controller to operate in Forced

Continuous Conduction Mode (FCCM) or Diode Emulation Mode

(DEM.) DEM is disabled when the FCCM pin is pulled above the

when the FCCM pin is pulled below the falling threshold voltage

EN (Pin 4)

The EN pin is the on/off switch of the IC. The soft-start sequence

begins when the EN pin is pulled above the rising threshold

COMP (Pin 5)

The COMP pin is the output of the control-loop error amplifier.

Compensation components for the control-loop connect across

the COMP and FB pins.

FB (Pin 6)

The FB pin is the inverting input of the control-loop error

amplifier. The converter output voltage regulates to 600mV from

the FB pin to the GND pin. Program the desired output voltage

with a resistor network connected across the VO, FB, and GND

pins. Select the resistor values such that FB to GND is 600mV

when the converter output voltage is at the programmed

regulation value.

FSET (Pin 7)

The FSET pin programs the PWM switching frequency. Program

the desired PWM frequency with a resistor and a capacitor

connected across the FSET and GND pins.

VO (Pin 8)

The VO pin measures the converter output voltage and is used

exclusively as an input to the R3™ PWM modulator. Connect at

the physical location where the best output voltage regulation is

desired.

ISEN (Pin 9)

The ISEN pin programs the threshold of the OCP overcurrent fault

protection. Program the desired OCP threshold with a resistor

connected across the ISEN and PHASE pins. The OCP threshold is

programmed to detect the peak current of the output inductor.

The peak current is the sum of the DC and AC components of the

inductor current.

PGND (Pin 10)

The PGND pin conducts the turn-off transient current through the

LG gate driver. The PGND pin must be connected to complete the

pull-down circuit of the LG gate driver. The PGND pin should be

connected to the source of the low-side MOSFET through a low

impedance path, preferably in parallel with the trace connecting

the LG pin to the gate of the low-side MOSFET. The adaptive

shoot-through protection circuit, measures the low-side MOSFET

gate-source voltage from the LG pin to the PGND pin.

LG (Pin 11)

The LG pin is the output of the low-side MOSFET gate driver.

Connect to the gate of the low-side MOSFET.

PROTECTION

ISEN OCP Threshold

19

26

33

µA

ISEN sourcing

17

26

33

µA

ISEN Short-circuit Threshold

ISEN sourcing

-

50

-

µA

UVP Threshold

81

84

87

%

OVP Rising Threshold

113

116

119

%

OVP Falling Threshold

100

103

106

%

OTP Rising Threshold (Note 6)TOTR

-

150

-

°C

-25

-

°C

NOTE:

6. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT