L5988D 데이터 시트보기 (PDF) - STMicroelectronics

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L5988D

4 A continuous (more than 5 A pulsed) step-down switching regulator with synchronous rectification

STMicroelectronics 

L5988D

2

Pin function

Figure 2. Pin connection

Pin function

No.

1, 16

2, 3

4

5

6

7

8

9

10

11

12

13

14, 15

Table 1. Pinout description

Name

Description

OUT

VIN

VCC

SS/INH

Regulator output

Unregulated DC input voltage

Unregulated DC signal input voltage

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

FB

SYNCH

FSW

U/O/S

VREF

SGND

PGND

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

Master/slave synchronization

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

Multifunction pin used to program additional features: UVLO thresholds,

OVP latched/not latched, SINK enabled/disabled

1.8 V voltage reference

Signal ground

Power ground

DocID15324 Rev 4

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