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

5 V Linear Regulator

V5P Accuracy and Load Regulation

V5P/V33 Tracking Ratio

V5P/V33 Tracking Accuracy

Linear Regulator and FET Driver

VV5P

V5Ptrack

ErrV5Ptrack

10 mA < IV5P < 270 mA, VVREG ≥ 5.25 V

VV5P / VV33

2.69 V < VV33 < 3.37 V, IV5P = 75 mA,

5.5 V < VIN < 27 V

4.9

5.0

5.1

V

1.507

1.515

1.523

–

−0.5

–

+0.5

%

V33 Accuracy

G33 Source Current1

G33 Sink Current1

G33 Maximum Voltage

G33 Minimum Voltage

G33 Output Impedance2

External FET Gate Capacitance2

Charge Pump (VCP Pin)

ErrV33

IG33(SRC)

IG33(SINK)

VG33(MAX)

VG33(MIN)

ROUT

CISS

10 mA < IV33 < 500 mA

VV33 = 3.0 V, VG33 = VG33(MAX) – 1 V

VV33 = 3.6 V, VG33 = 6 V

VV33 = 3.0 V

VV33 = 3.6 V

3.23

3.30

3.37

V

−175

−250

−400

μA

0.5

3

–

mA

9

–

15

V

–

0.7

1.0

V

–

175

–

Ω

250

–

5200

pF

Output Voltage

Switching Frequency

Logic Enable Input (ENB Pin)

ΔVVCP

fSW(CP)

VVCP − VIN

4.1

6.6

–

V

–

100

–

kHz

ENB Logic Input Threshold

VENB(H)

VENB(L)

VENB rising

VENB falling

ENB Logic Input Current1

IENB(IN) VENB = 3.3 V

ENB Pull-Down Resistance

RENB

Ignition Enable Input (ENBAT and ENBATS Pins)

–

–

2.0

V

0.8

–

–

V

–

–

100

μA

–

60

–

kΩ

ENBAT and ENBATS Thresholds

VIGN(H)

VIGN(L)

ENBAT Input Current1

IENBAT(IN)

ENBAT Input Resistance

RENBAT

Ignition Status Output (ENBATS Pin)

VIGN rising via a 1 kΩ series resistance,

measure VIGN when IQ occurs

VIGN falling via a 1 kΩ series resistance,

measure VIGN when IQ(SLEEP) occurs

VIGN = 5.5 V via a 1 kΩ series resistance

VIGN = 0.8 V via a 1 kΩ series resistance

–

–

4.0

V

2.2

–

–

V

–

50

100

μA

0.5

–

5

μA

–

650

–

kΩ

ENBATS Output Voltage

ENBATS Leakage Current1

ENBATS Turn-On Delay

VENBATS(L)

IENBATS

tENBATS

IENBATS = 4 mA

VENBATS = 3.3 V

Sleep mode to VENBATS = 3.3 V

–

–

400

mV

–

–

1

μA

–

11

–

ms

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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