MAX17491 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Single-Phase Synchronous MOSFET Driver

19-5324; Rev 0; 6/10
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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.