MAX8664 datasheet(7/26 Pages) MAXIM

7 / 26 page

Low-Cost, Dual-Output, Step-Down

Controller with Fast Transient Response

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Pin Description (continued)

NAME

FUNCTION

VCC

Internal Analog Supply. VCC regulates to 1.5V below VVL. Connect a 1µF ceramic capacitor from VCC to GND.

When using a 4.5V to 5.5V supply, connect a 10

Ω resistor from VCC to IN. VCC is used to power the IC’s

internal circuitry.

PWRGD

Open-Drain Power-Good Output. PWRGD is high impedance when controllers 1 and 2 (using the internal

reference) are in regulation. PWRGD is low if the outputs are out of regulation, if there is a fault condition, or if

the IC is shut down. PWRGD does not reflect the status of output 2 in the MAX8664A or when REFIN2 is

connected to an external reference in the MAX8664B.

FB1

Feedback Input for Controller 1. Connect FB1 to the center of a resistor-divider connected between the output

of controller 1 and GND to set the desired output voltage. VFB1 regulates to 0.6V.

ILIM1

Current-Limit Set for Controller 1. Connect a resistor from the drain of the high-side MOSFET(s) to ILIM1. See

the Setting the Overcurrent Threshold section.

MAX8664 Datasheet(PDF) 7 Page - Maxim Integrated Products