L5988D datasheet(9/52 Pages) STMICROELECTRONICS

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L5988D

Electrical characteristics

VCC = 12 V, TJ = 25 °C unless otherwise specified.

Table 5. Electrical characteristic

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VCC

Operating input voltage range

Vout = 0.6 V; Iout = 3 A

2.9

RDS(on) HS High side MOSFET on resistance Iout = 1.0 A



(1)

111

120

132



RDS(on) LS Low side MOSFET on resistance Iout = 1.0 A



(1)

100

106



IL HIGH SIDE Maximum peak limiting current

ILIM-ADJ = float

3.6

4.4

IL LOW SIDE Maximum valley limiting current

ILIM-ADJ = float

4.14

4.6

5.06

fSW

Switching frequency

FSW = floating

360

400

440

kHz

fSW ADJ

adjusted switching frequency

RFSW PULL DWN = 27 k

1000

kHz

Duty cycle

100

Selectable under voltage lockout (UVLO)

3.3 V BUS

Turn ON Vcc threshold

2.7

2.8

Turn OFF Vcc threshold

2.4

2.5

Hysteresis

200

12 V BUS

Turn ON Vcc threshold

8.6

Turn OFF Vcc threshold

6.8

Hysteresis

DC characteristic

ISS

Soft-start current

VSS/INH = 2 V

A

VSS/INH = 0

A

INH

Device ON level

0.8

Device OFF level

0.3

Quiescent current

Duty cycle = 0; VFB = 1 V

Iq st-by

Total stand-by quiescent current

A

Dynamic characteristic (see Figure 1 on page 1)

VFB

Voltage feedback in regulation

2.9 V < VCC < 18 V

0.595

0.6

0.605

(1)

0.592

0.6

0.609

Error amplifier

VOH

High level output voltage

VFB = 0.2 V; SS floating

3.1

VOL

Low level output voltage

VFB = 1.0 V

0.1

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