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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 Valid at 5.5 V < VIN < 36 V, −40ºC < TJ < 150ºC; unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

General Specifications

Functional Input Voltage

Operating Input Voltage

Supply Quiescent Current1

VIN(FUNC) A4407 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) and VENB < VENB(L) ,

no load on VREG

–

–

10

Buck Switching Regulator (VREG)

Switcher Output – Regulating

Switcher Output – Dropout

Switcher Period2

Switcher On-Time

Switcher Period Threshold

VREG(PWM)

VIN(SWNOM) < VIN < 27 V, VENB = high,

100 mA < IVREG < 1100 mA

VREG(100%)

VIN = 5.5 V, LX at 100% duty cycle,

IVREG = 1100 mA

VIN = 6.4 V and LX at 100% duty cycle,

IVREG = 200 mA

TSW(L) VIN(SWL) < VIN < VIN(SWNOM) , RTON = 412 kΩ

TSW(NOM) VIN(SWNOM) < VIN < VIN(SWH) , RTON = 412 kΩ

TSW(H) VIN(SWH) < VIN < 36 V, RTON = 412 kΩ

VIN = 7.5 V, RTON = 412 kΩ

tON

VIN = 13.5 V, RTON = 412 kΩ

VIN = 27 V, RTON = 412 kΩ

VIN = 35 V, RTON = 412 kΩ

VIN(SWL)

VIN falling, TSW changes from

TSW(L) to 100% duty cycle

VIN(SWNOM)

VIN falling, TSW changes from

TSW(NOM) to TSW(L)

VIN(SWH)

VIN rising, TSW changes from

TSW(NOM) to TSW(H)

5.30

5.03

–

–

–

–

1030

160

80

225

6.2

8.0

28

5.45

–

–

1.6

450

1.6

1290

200

118

280

6.5

8.6

31

5.60

–

6.38

–

–

–

1550

240

135

335

6.8

9.2

34

VIN(SWL)hys

Relative to the VIN voltage that initially caused

the switcher period to change

–

250

–

Switcher Period Hysteresis

Switch On-Resistance

Minimum On-Time

Minimum Off-Time

VIN(SWNOM) Relative to the VIN voltage that initially caused

hys

the switcher period to change

–

VIN(SWH)hys

Relative to the VIN voltage that initially caused

the switcher period to change

–

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

85

250

–

700

–

135

180

270

360

65

90

110

140

Unit

V

V

mA

μA

V

V

V

μs

ns

μs

ns

ns

ns

ns

V

V

V

mV

mV

mV

mΩ

mΩ

ns

ns

Continued on the next page…

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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