A4450 datasheet(6/34 Pages) ALLEGRO

Part #	A4450

Description	Buck-Boost Controller with Integrated Buck MOSFET

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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6 / 34 page

Buck-Boost Controller

with Integrated Buck MOSFET

A4450

6

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

ERROR AMPLIFIER

Open-Loop Voltage Gain

AVOL

–

65

–

dB

Transconductance

gmEA

550

750

950

µA/V

Output Current

IEA

–

±75

–

µA

Maximum Output Voltage,

Buck-Boost Mode

VEAVO(max)BuckBoost

–

1.5

–

V

Maximum Output Voltage,

Buck Mode

VEAVO(max)Buck

–

1.2

–

V

Minimum Output Voltage

VEAVO(min)

150

220

290

mV

BOOST MOSFET (LG) GATE DRIVER

LG High Output Voltage

VLG(ON)

VIN = 7 V

5.0

–

8.0

V

LG Low Output Voltage

VLG(OFF)

VIN = 13.5 V

–

0.4

V

LG Source Current1

ILG(ON)

VLG = 1 V

–

−265

–

mA

LG Sink Current1

ILG(OFF)

VLG = 1 V

–

500

–

mA

SOFT-START

SS PWM Frequency Foldback

(Linear)

fSW(SS)

VFB = 0 V

–

0.12 ×

fOSC

–

VFB = 0.2 V

–

0.43 ×

fOSC

–

VFB = 0.6 V

–

0.93 ×

fOSC

–

VFB = 0.8 V

–

fOSC

–

Switching Frequency in SYNC Mode

with Applied Frequency fSYNC

fSW(SYNC)

0 V < VFB < 0.2 V

–

fSYNC/4

–

0.2 V < VFB < 0.4 V

–

fSYNC/2

–

0.4 V < VFB

–

fSYNC

–

HICCUP MODE

Hiccup OCP PWM Counts

tHIC(OCP)

VFB < 0.4 V (typical), VCOMP = VEAVO(max)

–

30

–

PWM

cycles

VFB > 0.4 V (typical), VCOMP = VEAVO(max)

–

120

–

PWM

cycles

Hiccup Mode Recovery Time

tHIC(RECOVER)

LX switching stops to LX switching starts, during

overcurrent

3.0

–

5.6

ms

CURRENT PROTECTIONS

Pulse-by-Pulse Current Limit,

Buck-Boost Mode

ILIM(BuckBoost)

Buck-Boost mode

3.9

4.5

5.1

A

Pulse-by-Pulse Current Limit,

Buck Mode

ILIM(Buck)

Buck mode

2.4

2.8

3.4

A

LX Short-Circuit Current Limit

ILIM(LX)

6.3

7.4

8.5

A

MISSING BUCK DIODE (D1) PROTECTION

Detection Level2

VD(OPEN)

−1.6

−1.4

−1.1

V

Time Filtering 2

tD(OPEN)

50

–

250

ns

ELECTRICAL CHARACTERISTICS (continued): Valid at 3 V ≤ VIN ≤ 36 V and VIN having first reached VINSTART,

‒40°C ≤ TJ ≤ 150°C, unless noted otherwise

Continued on the next page…

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