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A4407

2.2 MHz Constant On-Time Buck Regulator With Two External and Two Internal Linear Regulators

Allegro MicroSystems 

A4407

2.2 MHz Constant On-Time Buck Regulator

With Two External and Two Internal Linear Regulators

ELECTRICAL CHARACTERISTICS (continued) Valid at 5.5 V < VIN < 36 V, −40ºC < TJ < 150ºC; unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Logic Enable Input (ENB)

ENB Logic Input Threshold

VENB(H)

VENB(L)

VENB rising

VENB falling

ENB Logic Input Current1

IENB(IN) VENB = 3.3 V

ENB Pulldown Resistance

RENB

Ignition Enable Input (ENBAT) and Ignition Status Output (ENBATS)

–

–

2.0

V

0.8

–

–

V

–

–

100

μA

–

60

–

kΩ

ENBAT and ENBATS Thresholds

ENBAT Input Current1

ENBAT Input Resistance

ENBATS Output Voltage

ENBATS Leakage Current1

ENBATS Turn-On Delay

TRACK Input

VIGN(H)

VIGN rising via a 1 kΩ series resistance,

measure VIGN when IQ occurs

VIGN(L)

VIGN falling via a 1 kΩ series resistance,

measure VIGN when IQ(SLEEP) occurs

IENBAT(IN)

VIGN = 5.5 V via a 1 kΩ series resistance

VIGN = 0.8 V via a 1 kΩ series resistance

RENBAT

VENBATS(L) IENBATS = 4 mA

IENBATS(LKG) VENBATS = 3.3 V

tENBATS Sleep mode to VENBATS = 3.3 V

–

3.3

4.0

V

2.2

2.7

–

V

–

50

100

μA

0.5

–

5

μA

–

650

–

kΩ

–

–

400

mV

–

–

1

μA

–

11

–

ms

TRACK Voltage Threshold

TRACK Bias Current1

NPOR Output

VTRACK(H) VTRACK rising

VTRACK(L) VTRACK falling

ITRACK(BIAS)

–

–

2.0

V

0.8

–

–

V

–

−100

–

μA

NPOR Power-Up Delay

NPOR Output Voltage

NPOR Leakage Current1

CPOR Characteristics

tNPOR CPOR = 0.22 μF

VENB = high or VENBAT = high,

VREG < VREGUV(L) or V3V3 < V3V3UV(L) ,

INPOR ≤ 4mA

VNPOR(L)

VENBAT = low, VENB transitioning low,

VREG = 5.45 V, INPOR ≤ 0.3 mA,

0.8 V < V3V3 < err3V3 , 0°C ≤ TJ ≤ 150°C

VENBAT = low, VENB transitioning low,

VREG = 5.45 V, INPOR ≤ 0.3 mA,

1.0 V < V3V3 < err3V3 , −40°C ≤ TJ ≤ 150°C

INPOR(LEAK) VNPOR = 3.3 V

–

20

–

ms

–

–

400

mV

–

350

800

mV

–

–

800

mV

–

–

1

μA

CPOR Charge Current1

CPOR Voltage Threshold

ICPOR(SRC)

VCPOR(H) VCPOR rising

–

−13

–

μA

1.0

1.2

1.4

V

Continued on the next page…

Allegro MicroSystems, Inc.

7

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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