ISL8201M

FN6657 Rev 3.00

Page 7 of 16

October 28, 2014

Pin Functions

PGND (Pins 1, 2, 3, 4, 11)

Power ground pin for signal, input, and output return path. PGND

needs to connect to one (or more) ground plane(s) immediately,

which is recommended to minimize the effect of switching noise,

copper losses, and maximize heat dissipation.

PVCC (Pin 5)

This pin provides the bias supply for ISL8201M, as well as the

low-side MOSFET’s gate and high-side MOSFET’s gate. If

PVCC rises above 6.5V, an internal 5V regulator will supply to

the internal logics bias (but high-side and low-side MOSFET

gate will still be sourced by PVCC). Connect a well decoupled

+5V or +12V supply to this pin.

NC (Pins 6, 8, 15)

These pins have no function; do not connect.

ISET (Pin 7)

The ISET pin is the input for the overcurrent protection (OCP)

to set the overcurrent threshold. The ISL8201M has an initial

protect overcurrent limit. It has an integrated internal 3.57k



can prevent significant overcurrent impact to the module. One

ISET pin and the PGND pin in order to reduce the current limit

point by paralleling.

VIN (Pin 9)

Power input pin. Apply input voltage between the VIN pin and

PGND pin. It is recommended to place an input decoupling

capacitor directly between the VIN pin and the PGND pin. The

input capacitor should be placed as closely as possible to the

module.

PHASE (Pin 10)

The PHASE pin is the switching node between the high and

low-side MOSFET. It also returns the current path for the high-

side MOSFET driver and detects the low-side MOSFET drain

voltage for the overcurrent limits point.

VOUT (Pin 12)

Power output pin. Apply output load between this pin and the

PGND pin. It is recommended to place a high frequency output

decoupling capacitor directly between the VOUT pin and the

PGND pin. The output capacitor should be placed as closely

as possible to the module.

COMP/EN (Pin 13)

This is the multiplexed pin of the ISL8201M. During soft-start

and normal converter operation, this pin represents the output

of the error amplifier. Use COMP/EN in combination with the

FB pin to compensate for the voltage control feedback loop of

will disable (shut-down) the controller, which causes the

oscillator to stop, and the high-side gate and low-side gate of

the MOSFETs outputs to be held low. The external pull-down

device will initially need to overcome a maximum of 5mA of

COMP/EN output current. However, once the controller is

disabled, the COMP/EN output will also be disabled, thus only

a 20µA current source will continue to draw current.

FB (Pin 14)

The FB pin is the output voltage adjustment of the ISL8201M. It

will regulate to 0.6V at the FB pin with respect to the PGND pin.

The ISL8201M has an integrated voltage dividing resistor. This

is a precision 9.76k

FB pins. Different output voltages can be programmed with

additional resistors between FB to PGND.

Reference Circuitry For General Applications

Typical Application with Single Power Supply

Figure 11 shows the ISL8201M application schematic for input

voltage +5V or +12V. The PVCC pin can connect to the input

supply directly.

Typical Application with Separated Power Supply

Figure 12 shows the ISL8201M application schematic for wide

+5V/+12V or +6.5V to 14.4V.

FIGURE 11. TYPICAL APPLICATION SCHEMATIC

PGND

FB

COMP/EN

VIN

VOUT

PHASE

ISET

PVCC

(+5V/+12V)

ISL8201M

FIGURE 12. WIDE INPUT VOLTAGE APPLICATION SCHEMATIC

PGND

FB

COMP/EN

VIN

VOUT

PHASE

ISET

PVCC

(+1V TO +20V)

(+5V/+12V)

or

(+6.5V TO 14.4V)

ISL8201M