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MAX17491

Single-Phase Synchronous MOSFET Driver

Maxim Integrated 

19-5324; Rev 0; 6/10

EVAALVUAAILTAIOBNLEKIT

Single-Phase Synchronous MOSFET Driver

General Description

The MAX17491 is a single-phase synchronous nonin-

verting MOSFET driver. The MAX17491 is intended to

work with controller ICs like the MAX8736, MAX8786, or

MAX17030 in multiphase notebook CPU core regulators.

The regulators can either step down directly from the

battery voltage to create the core voltage or step down

from the main system supply. The single-stage conver-

sion method allows the highest possible efficiency, while

the 2-stage conversion at higher switching frequency

provides the minimum possible physical size.

The low-side driver is optimized to drive 3nF capacitive

loads with 4ns/8ns typical fall/rise times, and the high-

side driver with 8ns/10ns typical fall/rise times.

Adaptive dead-time control prevents shoot-through cur-

rents and maximizes converter efficiency.

The MAX17491 features improved zero crossing and

UVLO performance over the MAX8791/MAX8791B.

The MAX17491 is available in a small, lead-free, 8-pin,

3mm x 3mm TQFN package.

Applications

Notebooks/Desktops/Servers

CPU Core Power Supplies

Multiphase Step-Down Converters

Pin Configuration

Features

♦ Single-Phase Synchronous MOSFET Driver

♦ 0.5Ω Low-Side On-Resistance

♦ 0.7Ω High-Side On-Resistance

♦ 10ns Minimum Guaranteed Dead Time

♦ Integrated Boost “Diode”

♦ 2V to 24V Input Voltage Range

♦ Selectable Pulse-Skipping Mode

♦ Low-Profile, 3mm x 3mm, TQFN Package

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX17491GTA+ -40°C to +105°C

8 TQFN-EP*

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Typical Operating Circuit

INPUT (VIN)

5V TO 24V

TOP VIEW

6

5

LX 7

DH 8

MAX17491

+

EP

1

2

4 DL

3 GND

TQFN

PWM

DH

PWM SKIP

+5V BIAS

SUPPLY

SKIP

BST

LX

MAX17491

VDD

DL

GND

PAD

VOUT (1.45V

AT 20A)

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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