L5988D datasheet(7/52 Pages) STMICROELECTRONICS

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L5988D

Pin function

Figure 2. Pin connection

Table 1. Pinout description

No.

Name

Description

1, 16

OUT

Regulator output

2, 3

VIN

Unregulated DC input voltage

VCC

Unregulated DC signal input voltage

SS/INH

An external logic signal (active LOW) disables the device. In case the pin

is floating the device deliver a constant current (22

A typ.) to charge the

soft-start capacitor (see Section 5.4 on page 18)

COMP

Error amplifier output for frequency compensation

ILIM-ADJ

Connecting a pull-up resistor to VREF or a pull-down resistor to GND the

internal current limit thresholds can be tuned to match the local application.

In case the pin is left floating no changes are applied to the default current

limit thresholds

8FB

Feedback input. Connecting the output voltage directly to this pin results in

a regulation voltage of 600 mV. An external resistive divider is required for

higher output voltages

SYNCH

Master/slave synchronization

FSW

Connecting a pull-up resistor to VREF or a pull-down resistor to GND the

internal oscillator frequency will be increased or decreased respectively. In

case the pin is left floating the predefined oscillator frequency

(400 kHz ± 10%) is active

U/O/S

Multifunction pin used to program additional features: UVLO thresholds,

OVP latched/not latched, SINK enabled/disabled

VREF

1.8 V voltage reference

SGND

Signal ground

14, 15

PGND

Power ground

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