A8698ELJ-T

A8698ELJ-T Datasheet

A8698 Wide Input Voltage A Step Down Regulator

Part	Datasheet
A8698ELJ-T	A8698ELJ-T (pdf)

Related Parts	Information
A8698ELJTR-T	A8698ELJTR-T

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A8698 Wide Input Voltage A Step Down Regulator 8 to 25 V input range Integrated DMOS switch Adjustable fixed off-time Highly efficient Adjustable to 20 V output Package 8-Lead SOIC with exposed thermal pad suffix LJ The A8698 is a constant off-time current mode step-down regulator with a wide input voltage range. Regulation voltage is set by external resistors, to output voltages as low as V. The A8698 includes an integrated power DMOS switch to reduce the total solution footprint. It also features internal compensation, allowing users to design stable regulators with minimal design efforts. The off-time can be set with an external resistor, allowing flexibility in inductor selection. Additionally, the A8698 has a logic level enable pin which can shut the device down and put it into a low quiescent current mode for power sensitive applications. The A8698 is supplied in a low-profile 8-lead SOIC with exposed pad package LJ . Applications include: Applications with 8 to 25 V input Consumer electronics, networking equipment 12 V lighter-powered applications portable DVD, etc. Point of Sale POS applications Approximate Scale 1:1 CBOOT uF BOOT A8698 TSET RTSET k7 VBIAS FB D1 +8 to 24 V CIN3 CIN2 CIN1 82 uF 82 uF L1 33 uH R1 k7 R2 2 k7 VOUT V / 3 A COUT 330 uF V ESR Circuit for 12 V step down to V at 3 A. Efficiency % 92 90 88 86 84 82 80 78 76 74 72 70 Efficiency VIN = V VOUT = V VOUT = V VOUT = V Load Current A Efficiency curves for circuit at left. A8698 Wide Input Voltage A Step Down Regulator Absolute Maximum Ratings Characteristic Conditions Min. Typ. Ordering Information Use the following complete part numbers when ordering: Part Numbera Packingb A8698ELJTR-T 13 in. reel, 3000 pieces/reel aLeadframe plating 100% matte tin. bContact Allegro for additional packing options. LJ package, SOIC surface mount with exposed thermal pad Allegro MicroSystems, LLC 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 508 853-5000 A8698 Wide Input Voltage A Step Down Regulator Functional Block Diagram BOOT VIN ENB uC TSET GND VBB UVLO TSD Boot Charge Switch Disable Switch PWM Control I_Peak Clamp I_Demand Error COMP LX L1 VOUT ESR COUT Bias Supply VBIAS VBIAS is connected to VOUT when VOUT target is between and 5 V Soft Start Ramp Generation Allegro MicroSystems, LLC 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 508 853-5000 A8698 Wide Input Voltage A Step Down Regulator ELECTRICAL CHARACTERISTICS1,2 at TA = 25°C, VIN = 8 to 25 V unless noted otherwise Characteristics Test Conditions Min.

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A8698 Wide Input Voltage A Step Down Regulator
8 to 25 V input range Integrated DMOS switch Adjustable fixed off-time Highly efficient Adjustable to 20 V output

Package 8-Lead SOIC with exposed thermal pad suffix LJ

The A8698 is a constant off-time current mode step-down regulator with a wide input voltage range. Regulation voltage is set by external resistors, to output voltages as low as V.

The A8698 includes an integrated power DMOS switch to reduce the total solution footprint. It also features internal compensation, allowing users to design stable regulators with minimal design efforts.

The off-time can be set with an external resistor, allowing flexibility in inductor selection. Additionally, the A8698 has a logic level enable pin which can shut the device down and put it into a low quiescent current mode for power sensitive applications.

The A8698 is supplied in a low-profile 8-lead SOIC with exposed pad package LJ . Applications include:

Applications with 8 to 25 V input Consumer electronics, networking equipment 12 V lighter-powered applications portable DVD, etc. Point of Sale POS applications

Approximate Scale 1:1

CBOOT uF

BOOT

A8698

TSET RTSET k7

VBIAS FB D1
+8 to 24 V

CIN3

CIN2

CIN1
82 uF
82 uF

L1 33 uH

R1 k7

R2 2 k7

VOUT V / 3 A

COUT 330 uF V ESR

Circuit for 12 V step down to V at 3 A.

Efficiency %
92 90 88 86 84 82 80 78 76 74 72 70

Efficiency

VIN = V

VOUT = V VOUT = V

VOUT = V

Load Current A

Efficiency curves for circuit at left.

A8698

Wide Input Voltage A Step Down Regulator

Absolute Maximum Ratings

Characteristic

Conditions

Min.

Typ.
Ordering Information Use the following complete part numbers when ordering:

Part Numbera

Packingb

A8698ELJTR-T
13 in. reel, 3000 pieces/reel
aLeadframe plating 100% matte tin. bContact Allegro for additional packing options.

LJ package, SOIC surface mount with exposed thermal pad

Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 508 853-5000

A8698

Wide Input Voltage A Step Down Regulator

Functional Block Diagram

BOOT VIN

ENB uC

TSET

GND VBB UVLO TSD

Boot Charge

Switch Disable

Switch PWM Control

I_Peak

Clamp

I_Demand

Error

COMP

LX L1

VOUT ESR COUT

Bias Supply

VBIAS

VBIAS is connected to VOUT
when VOUT target is between and 5 V

Soft Start Ramp Generation

Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 508 853-5000

A8698

Wide Input Voltage A Step Down Regulator

ELECTRICAL CHARACTERISTICS1,2 at TA = 25°C, VIN = 8 to 25 V unless noted otherwise

Characteristics

Test Conditions

Min.

More datasheets: 910-4MM | 910-495 | 910-490 | 910-485 | 910-480 | 910-475 | 910-530 | 910-895 | 1096 | A8698ELJTR-T

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Datasheet ID: A8698ELJ-T 516088