A2550 データシートの表示（PDF） - Allegro MicroSystems

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A2550

Relay Driver with 5 V Regulator for Automotive Applications

Allegro MicroSystems 

A2550

Relay Driver with 5 V Regulator

for Automotive Applications

ELECTRICAL CHARACTERISTICS, continued –40°C ≤ TJ ≤ 150°C, VBB within operating limits, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min. Typ. Max.

Watchdog and Power-On Reset

NPOR Active Voltage

NPOR Inactive Leakage Current

CWD and CPOR Trip Voltage

CPOR Charge Current

Power-On Reset Cycle Time5

CWD Charge Current

VNPOR INPOR = 1 mA; VREG5 = 1.5 V; 1.5 V ≤ VBB ≤ 40 V –

–

400

INPOR(Off) VNPOR = 5 V

–

–

10

VTRIP(H) VTRIP(H) = VREF

–

1.2

–

VTRIP(L)

–

0.2

–

IPOR

2.5

5

7.5

tPOR

CPOR = 0.22 μF

–

44

–

ICWD

Charging

Discharging

2.5

5

7.5

–

70

–

Thermal Protection

Thermal Shut Down Threshold

Thermal Shut Down Hysteresis

TTSD

TTSDhys

150 175

–

–

15

–

1See Applications Information section for operation with VBB < 7 V. For VBB > 24 V, thermal constraints limit regulator current.

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

3When VENBAT exceeds VBB it is clamped with a diode. (VENBAT – VBB) ≤ 1.2 V at 40 mA.

4Defined as the maximum current level allowed during excessive load condition.

5See Applications Information section for calculations. Values guaranteed by design, and depend on capacitor tolerances.

Units

mV

μA

V

V

μA

ms

μA

μA

°C

°C

THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information

Characteristic

Symbol

Test Conditions*

Value Units

Thermal Resistance, Junction to Pad

RθJP

2 ºC/W

Thermal Resistance, Junction to

Ambient

4-layer PCB based on JEDEC standard

RθJA

2-layer PCB with 2 in.2 copper both sides

34 ºC/W

44 ºC/W

Maximum Allowable Power Dissipation

RθJA = 44 ºC/W (estimated), 2-layer PCB with 2.0 in.2 of 2 oz. copper,

PD

TA = 125°C

RθJA = 44 ºC/W (estimated), 2-layer PCB with 2.0 in.2 of 2 oz. copper,

TA = 85°C

*Additional thermal data available on the Allegro Web site.

0.57 W

1.48 W

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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