LTC7103 datasheet(11/48 Pages) AD

11 / 48 page

LTC7871

Rev. 0

For more information www.analog.com

SETCUR (Pin 11): This pin sets the maximum average

inductor current in buck or boost mode. This pin sources

16μA current and it is programmable by the SPI interface.

PWM1, PWM2, PWM3, PWM4, PWM5, PWM6 (Pins 29,

31, 32, 33, 34, and 36): (Top) Gate Signal Output. This

signal goes to the PWM or top gate input of the external

gate driver or integrated driver MOSFET. This is a three-

state compatible output.

PWMEN (Pin 28): Enable Pin for External Gate Drivers.

Open drain logic that is pulled to ground when the

LTC7871 shut downs the external gate drivers. When this

pin is low, all the PWM pin outputs are high impedance.

CSB, SDO, SDI, SCLK (Pins 37, 38, 39 and 40): 4-Wire

Serial Peripheral Interface (SPI). Active low chip select

(CSB), serial clock (SCLK) and serial data in (SDI) are

digital Inputs. Serial data out (SDO) is an open-drain

NMOS output pin. SDO requires an external pull-up resis-

tor. Refer to the Serial Port section for more details.

NC (Pins 2, 8, 12, 26, 41, 43, 47, and 55): No Connect Pins.

SGND (Pins 5, 16, 45 and Exposed Pad): Ground. Must

be soldered to PCB ground for rated thermal performance.

Connect this pin closely to negative terminal of VHIGH,

DRVCC, V5 bypass capacitors. All small signal components

and compensation components should connect here.

UVHIGH (Pin 14): VHIGH Undervoltage Threshold Set Pin.

A resistor divider from VHIGH is needed to set this thresh-

old. When the voltage on this pin falls below the 1.2V

trip point, a 5μA current is sunk in to the pin to provide

externally adjustable hysteresis.

OVHIGH (Pin 13): VHIGH Overvoltage Threshold Set Pin. A

resistor divider from VHIGH is needed to set this thresh-

old. When the voltage on this pin rises past the 1.2V trip

point, a 5μA current is sourced out of the pin to provide

externally adjustable hysteresis.

OVLOW (Pin 15): VLOW Overvoltage Threshold Set Pin. A

resistor divider from VLOW is needed to set this thresh-

old. When the voltage on this pin rises past the 1.2V trip

point, a 5μA current is sourced out of the pin to provide

externally adjustable hysteresis.

BUCK (Pin 54): The voltage on this pin determines if the

IC is regulating the VLOW or VHIGH voltage/current. Float

or tie this pin to V5 for buck mode operation. Ground this

pin for boost mode operation.

IMON (Pin 10): Current Monitor Pin. The voltage on this

pin is directly proportional to the average inductor cur-

rents of all 6 channels. 1.25V on this pin indicates zero

average inductor current per phase.

PIN FUNCTIONS

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