A6985F datasheet(10/77 Pages) STMICROELECTRONICS

Part #	A6985F

Description	38 V 500 mA synchronous step-down switching regulator

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Electrical characteristics

A6985F

10/77

DocID027738 Rev 2

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 = 0.5 A

(2)

1.67

A/V

Slope compensation

(5)

0.2

0.3

0.4

A

Overvoltage protection

VOVP

Overvoltage trip (VOVP/VREF)

1.15

1.2

1.25

VOVP

HYST

Overvoltage hysteresis

0.5

2

5

%

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,Table 8, Table 9

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 1.234 1.258

V

ID CH

CDELAY charging current

VFB > VTHR

12

3

A

Thermal shutdown

TSHDWN

Thermal shutdown

temperature

(2)

165

°C

THYS

Thermal shutdown hysteresis

(2)

30

1. Parameter tested in static condition during testing phase. Parameter value may change over dynamic application condition.

2. Not tested in production.

3. LCM enables SLEEP mode at light-load.

4. TJ = -40°C.

5. Measured at fsw = 250 kHz.

Table 5. Electrical characteristics (continued)

Symbol

Parameter

Test condition

Note Min.

Typ.

Max.

Unit

VPP gCS



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