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PM6681A

Dual synchronous step-down controller with adjustable LDO

STMicroelectronics 

Electrical characteristics

5

Electrical characteristics

PM6681A

Table 6.

Symbol

Electrical characteristics

(VIN = 24 V; TJ = 25 °C, unless otherwise specified)

Parameter

Test condition

Supply section

Turn-on voltage threshold

VV5SW

Turn-off voltage threshold

Hysteresis

RDS(on)

LDO5 internal bootstrap

switch resistance

OUTx, OUTx

discharge-mode

On-resistance

OUTx, OUTx

discharge-mode

Synchronous rectifier

turn-on level

Pin

Operating power

consumption

Ish

Operating current sunk by

VIN

Isb

Operating current sunk by

VIN

Shutdown section

V5SW > 4.9 V

FBx > VREF, Vref in regulation,

V5WS to 5 V

SHDN connected to GND

ENx to GND, V5SW to GND

VSHDN

Device on threshold

Device off threshold

soft-start section

soft-start ramp time

Current limit and zero crossing comparator

ICSENSE

Input bias current limit (1)

Comparator offset

Zero crossing comparator

offset

VCSENSE - VPGND

VPGND - VPHASE

Fixed negative current limit

threshold

VPGND - VPHASE

Min Typ Max Unit

4.8

4.9

V

4.6

4.75

V

20

50

mV

1.8

3

Ω

18

25

Ω

0.2

0.35

0.6

V

4

mW

20

30

µA

250

380

µA

1.2

1.5

1.7

V

0.8

0.85

0.9

V

2

3.5

ms

90

100

110

µA

-6

6

mV

-1

11

mV

-120

mV

10/47

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