A4402K データシートの表示（PDF） - Allegro MicroSystems

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A4402K

Constant On-Time Buck Converter With Integrated Linear Regulator

Allegro MicroSystems 

A4402

Constant On-Time Buck Converter

With Integrated Linear Regulator

ELECTRICAL CHARACTERISTICS1 (continued) valid for Temperature Range E version at TJ = 25°C and for Temperature

Range K version at TJ = –40°C to 150°C, VIN1 = 6 to 50 V (unless otherwise noted)

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Timing Circuitry

TSET Current, Watchdog Mode

TSET Valley Voltage, Watchdog Mode

TSET Reset Voltage, Watchdog Mode

WDI Frequency

WDI Duty Cycle

WDI Logic Input

ITSETWDI

VTRIP

VRESET

fWDI

DCWDI

VWDI(0)

NPOR = high

7

10

14

μA

–

1.2

–

V

–

0.48

–

V

–

–

100

kHz

10

–

90

%

VIN2 ×

0.55

–

–

V

WDI Logic Input Current2

IWDI

VWDI = 0 to 5 V

–20

< 1.0

20

μA

WDI Input Hysteresis

VWDIHYS

–

300

–

mV

TSET Current, Soft Start Mode

ITSETSS

NPOR = low

14

20

26

μA

POR Current

IPOR

3.92

5.60

7.28

μA

1Temperature Range E version tested at TJ = 25°C with performance from –40°C to 85°C guaranteed by design and characterization.

2For input and output current specifications, negative current is defined as coming out of (sourcing) the specified pin.

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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