A8582KLPTR-T datasheet(3/32 Pages) ALLEGRO

Part #	A8582KLPTR-T

Description	The A8582 is an adjustable frequency, high output current, PWM regulator that integrates a low resistance, high-side, N-channel MOSFET.

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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3 / 32 page

Wide Input Voltage, 2.4 MHz, 2.0 A

Asynchronous Buck Regulator

A8582

3

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Functional Block Diagram

FSET

VREF 0.8 V

VREF

tOFF(MIN)

70

mΩ

10 Ω

90%×VREF

85%×VREF

Current Sense

Amp

OCP

VREG

POR

VREG

BS UVLO

FBOK

BOOT

– SW

VSS –

400 mV

PWM

Comp

Adj

Reset

DOM

PWM

Ramp

Offset

300 mV

PWM Clk

fSW

SYNC

Regulator

EN

FBOK

Sleep

EN/SYNC

Comp

Error

Amp

OVP

Comp

EN/SYNC >1.2 × fSW

VIN

FBX

FB

150 nA

10 μA

20 μA

POK

SW

BOOT

SW

OSC

3.5 kΩ

0.85 V

Typ

1.25 V Typ

1.65 V Typ

2.9 V

+

–

+

–

+

–

OVP

S

R

Q

Slope

Compensation

EN/SYNC

SS

GND

PAD

GND

FAULT = 1, if:

EN = 0, or

UVLO = 1, or

OVP = 1, or

Diode Missing = 1

HICCUP = 1, if Hiccup protection enabled (VFB < 625 mV) and

a net count of > 7 OCP events occur

1500 Ω

125 ns

COMP

∑

UVLO

(VIN)

Diode

Missing

HICCUP

Latched

Hiccup

Protection

Hiccup reset VSS = 235 mV Typ

Clamp 1.7 V Typ

40 kΩ Typ

Rising

Digital

OFF

TSD

POR

FAULT

Fault

Logic

UVLO (VIN)

OCP

Latch reset

EN/SYNC

toggle

OVP

Diode Missing

A

B

114%×VREF

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