L99LD02 datasheet(10/66 Pages) STMICROELECTRONICS

10 / 66 page

Introduction

L99LD02

10/66

DS12448 Rev 3

Table 1. Pin functionality

Pin Number

Name

Function

2VS

Input supply pin of the IC.

Connect to the battery voltage through a Schottky diode.

3TM

Internal Function. Drive this line from fail safe logic or directly with

microcontroller I/O pin.

This pin can be used for stand-by mode activation in Limp Home.

4COMP

Output of the error amplifier of the boost controller. Connect the compensation

network between this pin and GND.

5,6

V3V3A, V3V3D

(Note 1)

Output of the 3.3 V regulated internal supply (logic supply).

Connect a low ESR capacitor (1uF) close to this pin.

SGND

Signal Ground connection.

SYNC_I/O

Boost synchronization Input / Output pin.

This pin generates the clock signal for synchronizing another L99LD02 in multi-

phase configuration.

CSN

Chip Select Not (active low) for SPI communication. It is the selection pin of the

device. It is a CMOS compatible input.

SDI

Serial Data Input for SPI communication. Data is transferred serially into the

device on SCLK rising edge.

SCK

Serial Clock for SPI communication. It is a CMOS compatible input.

SDO

Serial Data Output for SPI communication. Data is transferred serially out of

the device on SCLK falling edge.

VDD

Connection to external 3.3V or 5V supplies voltage.

The external supply powers SPI interface and the I/O signal pins to the

microcontroller.

SP2

Positive connection to the boost shunt resistor 2, in series to the boost

switching mosfet.

SN2

Negative connection (Ground) to the boost shunt resistor 2, in series to the

boost switching mosfet.

TMUX

Internal function. Left open.

G02

Output of the gate driver 2 for the external the boost switching mosfet.

PGND

Power Ground connection.

G01

Output of the gate driver 1 for the external the boost switching mosfet.

V10V

Output of the 10V regulated internal supply (gate driver supply).

Connect low ESR capacitor (1uF typical) close to this pin.

SN1

Negative connection (Ground) to the boost shunt resistor 1, in series to the

boost switching mosfet.

SP1

Positive connection to the boost shunt resistor 1, in series to the boost

switching mosfet.

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