L99LD20 datasheet(10/61 Pages) STMICROELECTRONICS

10 / 61 page

Introduction

L99LD20

10/61

DS11366 Rev 3

BUCKIN2

Connection to the input of the buck channel 2

CBOOT2

Connection to the bootstrap capacitor (100nF) of the buck channel 2.

22, 38

PGND

Power Ground connection.

VLED2

Connection to the anode of the LED string for read back of the forward

voltage of the channel 2.

VLED1

Connection to the anode of the LED string for read back of the forward

voltage of the channel 1.

LX1F

Connection to the switching source node of the buck1. This pin must be

connected to external free-wheeling diode.

LX1S

Kelvin connection to the switching source node of the buck1. This pin

has to be connected to external bootstrap capacitance.

BUCKIN1

Connection to the input of the buck channel 1.

CBOOT1

Connection to the bootstrap capacitor (100 nF) of the buck channel 1.

Input supply pin of the IC. Connect VS to the battery voltage.

TEST1

Internal function. To be tied to GND.

SGND2

Signal ground connection.

TEST2

Internal function. To be tied to GND.

11, 12, 13,

14, 15, 19,

21, 27, 29,

32, 33, 34,

36, 39

Not connected

Table 1. Pin functionality (continued)

Pin #

Name

Function

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