A4406 データシートの表示（PDF） - Allegro MicroSystems

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A4406

Constant On-Time Buck Regulator With One External and One Internal Linear Regulator

Allegro MicroSystems 

A4406

Constant On-Time Buck Regulator

With One External and One Internal Linear Regulator

ELECTRICAL CHARACTERISTICS (continued) Valid at –40°C ≤ TJ ≤ 150°C, 5.5 V ≤ VIN ≤ 36 V; unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

NPOR Pin Output and Timing

NPOR Power-Up Delay

NPOR Output Voltage

NPOR Leakage Current1

CPOR Pin Characteristics

tNPOR

VNPOR(L)

INPOR(LEAK)

CPOR = 0.22 μF

ENB = high or ENBAT = high,

VVREG < VREGNPOR(L) or VV33 < V33NPOR(L) ,

INPOR ≤ 4 mA

ENBAT = low, ENB transitioning to low,

VVREG = 5.45 V, INPOR ≤ 0.3 mA,

0.8 V < VV33 < ErrV33 , 0°C ≤ TJ ≤ 150°C

ENBAT = low, ENB transitioning to low,

VVREG = 5.45 V, INPOR ≤ 0.3 mA,

1.0 V < VV33 < ErrV33 , −40°C ≤ TJ ≤ 150°C

VNPOR = 3.3 V

–

20

–

ms

–

–

400

mV

–

350

800

mV

–

–

800

mV

–

–

1

μA

CPOR Charge Current1

CPOR Threshold

VREG Pin Soft Start Timing

ICPOR(SRC)

VCPOR(H) VCPOR rising

–

−13

–

μA

1.0

1.2

1.4

V

Soft Start

tSS

Protection Circuitry

–

10

–

ms

VREG Pin NPOR Thresholds

VREG Pin NPOR Hysteresis

V33 Regulator NPOR Thresholds

V33 Regulator NPOR Hysteresis

V33 Regulator Overcurrent Threshold

V33 Regulator Current Limit

V33 Regulator Foldback Threshold

V33 Regulator Foldback

Current Limit

VREGNPOR(H) VVREG rising, NPOR transitioning to high

VREGNPOR(L) VVREG falling, NPOR transitioning to low

VREG(HYS)

V33NPOR(H) VV33 rising, NPOR transitioning to high

V33NPOR(L) VV33 falling, NPOR transitioning to low

V33(HYS)

V33OCP VVREG – VCLV33

IV33ILIM RCL = 620 mΩ

V33IFB VV33 = 0 V, VVREG – VCLV33

IV33IFB RCL = 620 mΩ

4.80

5.00

5.20

V

4.75

4.94

5.14

V

–

60

–

mV

2.80

2.95

3.10

V

2.69

2.83

2.97

V

–

125

–

mV

175

200

245

mV

–

323

–

mA

35

55

75

mV

–

89

–

mA

V5P Pin Current Limit1

IV5PILIM VV5P = 5 V

−300

−405

–

mA

V5P Pin Foldback Current1

IV5PIFB VV5P = 0 V

−70

−110

−150

mA

Thermal Shutdown Threshold

TJTSD TJ rising

155

170

–

ºC

Thermal Shutdown Hysteresis

TJTSD(HYS)

–

20

–

ºC

1For input and output current specifications, negative current is defined as coming out of (sourcing) the specified pin.

2Determined by design and systems characterization. Not production tested.

Allegro MicroSystems, Inc.

8

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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