A6986 datasheet(10/67 Pages) STMICROELECTRONICS

Part #	A6986

Description	38 V, 2 A synchronous step-down switching regulator with 30 쨉A quiescent current

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Electrical characteristics

A6986

10/67

DocID026211 Rev 6

Error amplifier

VFB

Voltage feedback

0.841 0.85

0.85

9

V

IFB

FB biasing current

50

500

nA

Gm

Transconductance

90

155

210

S

(4)

70

155

210

AV

Error amplifier gain

(2)

100

dB

ICOMP

EA output current capability

±6

±12

±25

A

(4)

±4

Inner current loop

gCS

Current sense

transconductance (VCOMP to

inductor current gain)

Ipk = 1 A

(5)

2.5

A/V

Slope compensation

(5)

0.4

0.75

1.0

A

Overvoltage protection

VOVP

Overvoltage trip (VOVP/VREF)

1.15

1.2

1.25

VOVP

HYST

Overvoltage hysteresis

1

2

6

%

Synchronization (fan out: 6 slave devices typ.)

fSYN MIN

Synchronization frequency

LNM; fSW = VCC

266.5

kHz

VSYN TH SYNCH input threshold

LNM, SYNCH rising

0.70

1.2

V

ISYN

SYNCH pulldown current

LNM, VSYN = 1.2 V

0.7

mA

VSYN OUT

high level output

LNM, 5 mA sinking load

1.40

V

low level output

LNM, 0.7 mA sourcing load

0.6

Reset

VTHR

Selected RST threshold

MLF pinstrapping before SS

see Table 7

VTHR HYST RST hysteresis

(2)

2%

VRST

RST open collector output

VIN > VINH AND

VFB < VTH

4 mA sinking load

0.4

V

2 < VIN < VINH

4 mA sinking load

0.8

Delay

VTHD

RST open collector released

as soon as VDELAY > VTHD

VFB > VTHR

1.19

1.23

4

1.25

8

V

ID CH

CDELAY charging current

VFB > VTHR

12

3

A

Table 5. Electrical characteristics (continued)

Symbol

Parameter

Test condition

Note Min. Typ. Max. Unit

VPP gCS



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