General Description

The MAX8811 2-phase gate driver controls power

MOSFETs in multiphase synchronous step-down con-

verter applications, providing up to 30A output current

per phase. The MAX8811 and MAX8810A (multiphase

power-supply controller) combine to provide an efficient,

low-cost solution for a wide range of multiphase power-

supply applications. The MAX8811 handles system input

voltages up to 26V. Each MOSFET driver is capable of

driving 3000pF capacitive loads with 11ns typical rise

and fall times.

Adaptive shoot-through protection circuitry is imple-

mented to prevent shoot-through currents for the “high-

side off to low-side on” transition. A programmable

delay is provided for the “low-side off to high-side on”

transition. This maximizes overall converter efficiency

while supporting operation with a variety of MOSFETs.

The MAX8811 provides an easy upgrade path from the

MAX8523 dual driver. Integrated bootstrap diodes

reduce external component count, while an enable

input provides flexibility for power sequencing. The

MAX8811 is available in a space-saving, 16-pin QSOP.

Applications

Processor Core Voltage Regulators

Multiphase Buck Converters

Voltage-Regulator Modules (VRMs)

Switching Power Supplies

DC-DC Converter Modules

Features

♦ Dual-Phase Synchronous Buck Driver

♦ Integrated Bootstrap Diodes

♦ Up to 26V System Input Voltage

♦ 6A Peak Gate Drive Current

♦ Capable of 30A per Phase

♦ 0.4Ω/0.9Ω Low-Side, 0.7Ω/1.0Ω High-Side

Drivers (typ)

♦ Typical 11ns Rise/Fall Times with 3000pF Load

♦ Adaptive Dead-Time Control

♦ User-Programmable Delay Time

♦ Enable Function with 0.04µA (typ) Quiescent

Current in Shutdown

♦ Space-Saving, Lead-Free, 16-Pin QSOP

High-Speed, Dual-Phase Driver

with Integrated Boost Diodes

________________________________________________________________ Maxim Integrated Products

1

19-3974; Rev 0; 1/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

BST1

BST2

DH2

LX2

VL2

DL2

PGND2

PWM2

PWM1

TOP VIEW

MAX8811

QSOP

DH1

LX1

PGND1

VL1

DL1

EN

DLY

+

Pin Configuration

Ordering Information

DH1

VL2

2

13

DLY

8

EN

7

PWM1

9

PWM2

10

VL1

4

1

3

5

6

DL1

LX1

BST1

OUTPUT

PGND1

MAX8811

DH2

15

16

14

12

11

DL2

LX2

BST2

PGND2

+

POWER INPUT

UP TO 26V

GATE-DRIVE SUPPLY

4.5V TO 7V

OFF

ON

PWM CONTROL

SIGNALS

Typical Operating Circuit

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX8811EEE+

-40°C to +85°C

16 QSOP

E16-4

+ = Denotes lead-free package.

EVALUATION

KIT

AVAILABLE