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 Valid at –40°C ≤ TJ ≤ 150°C, 5.5 V ≤ VIN ≤ 36 V; unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

General

Function Input Voltage

Operating Input Voltage

Supply Quiescent Current1

VIN(f) Device functional, parameters not guaranteed

5.5

−

46

VIN(op)

5.5

13.5

36

IQ

VIN = 13.5 V, VIGN > VIGN(H) or VENB > VENB(H),

no load on VREG

–

10

–

IQ(SLEEP)

VIN = 13.5 V, VIGN < VIGN(L), VENB < VENB(L), no

load on VREG

–

–

10

Buck Regulator

Switcher Output

Switcher Period2

Switcher On-Time

Switcher Period VIN Threshold

Switcher Period VIN Hysteresis

VVREG

TSW(L)

TSW(NOM)

TSW(H)

tON

VINSW(L)

ENB = high , VINSW(L) < VIN < 27 V,

25 mA < IVREG < 600 mA

ENB = high , VINSW(NOM) < VIN < 27 V,

25 mA < IVREG < 750 mA

ENB = high , 5.5 V < VIN < 6.5 V,

LX 100% on, 100 mA < IVREG < 600 mA

VINSW(L) < VIN < VINSW(NOM), RTON = 412 kΩ

VINSW(NOM) < VIN < VINSW(H), RTON = 412 kΩ

VINSW(H) < VIN < 36 V, RTON = 412 kΩ

VIN = 7 V, RTON = 412 kΩ

VIN = 13.5 V, RTON = 412 kΩ

VIN = 27 V, RTON = 412 kΩ

VIN = 35 V, RTON = 412 kΩ

VIN falling, TSW changes from TSW(L) to

100% duty cycle

VINSW(NOM) VIN falling, TSW changes from TSW(NOM) to TSW(L)

VINSW(H) VIN rising, TSW changes from TSW(NOM) to TSW(H)

VINSW(HYS)

VINSW(L) and VINSW(NOM) comparators, relative to

the VIN voltage that initially caused the switcher

period to change

VINSW(H) comparator, relative to the VIN voltage

that initially caused the switcher period to

change

5.25

5.30

5.15

–

–

–

1070

160

80

220

5.9

7.7

28

–

–

5.45

5.45

–

1.6

450

1.6

1335

200

118

275

6.2

8.3

31

250

700

5.60

5.60

6.46

–

–

–

1600

240

135

330

6.5

8.9

34

–

–

Buck Switch On-Resistance

Minimum On-time

Minimum Off-time

ISEN Voltage Threshold

VREG Valley Current Limit

VREG Peak Current Limit

RDS(on)

TJ = 25°C, IDS = 0.1 A

TJ = 150°C, IDS = 0.1 A

ton(min) VIN = 13.5 V, RTON = 49.9 kΩ

toff(min) VIN = 13.5 V

VISEN

VISEN+ – VISEN–

ILIM(VALLEY) RSENSE = 300 mΩ, VIN > VINSW(L)

ILIM(PEAK)

–

275

300

–

400

470

–

65

90

85

110

140

175

220

265

–

733

–

2.5

5.0

–

Unit

V

V

mA

μA

V

V

V

μs

ns

μs

ns

ns

ns

ns

V

V

V

mV

mV

mΩ

mΩ

ns

ns

mV

mA

A

Continued on the next page…

Allegro MicroSystems, Inc.

6

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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