A7986ATR datasheet(6/42 Pages) STMICROELECTRONICS

Part #	A7986ATR

Description	3 A step-down switching regulator for automotive applications

PDF	42 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Electrical characteristics

A7986A

6/42

DocID022801 Rev 5

Electrical characteristics

TJ = - 40 °C to 125 °C, VCC = 12 V, unless otherwise specified.

Table 4. Electrical characteristics

Symbol

Parameter

Test conditions

Values

Unit

Min.

Typ.

Max.

VCC

Operating input voltage

range

4.5

VCCON

Turn-on VCC threshold

4.5

VCCHYS

VCC UVLO hysteresis

0.1

0.4

RDS(on)

MOSFET on-resistance

200

400

ILIM

Maximum limiting current

TJ = 25 °C

3.7

5.2

3.5

5.2

Oscillator

FSW

Switching frequency

210

250

275

KHz

VFSW

FSW pin voltage

1.254

Duty cycle

100

FADJ

Adjustable switching

frequency

RFSW = 33 kΩ

1000

KHz

Dynamic characteristics

VFB

Feedback voltage

4.5 V< VCC < 38 V

0.588

0.6

0.612

DC characteristics

Quiescent current

Duty cycle = 0,

VFB = 0.8 V

2.4

IQST-BY

Total standby quiescent

current

μA

Enable

VEN

EN threshold voltage

Device OFF level

0.3

Device ON level

1.2

IEN

EN current

EN = VCC

7.5

μA

Soft-start

TSS

Soft-start duration

FSW pin floating

7.3

8.2

9.8

FSW = 1 MHz,

RFSW = 33 kΩ

Error amplifier

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