MAX8791 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Single-Phase Synchronous MOSFET Driver

19-0628; Rev 1; 11/06
Single-Phase Synchronous MOSFET Driver
General Description
The MAX8791 is a single-phase synchronous nonin-
verting MOSFET driver. The MAX8791 is intended to
work with controller ICs like the MAX8736 or MAX8786,
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 currents and
maximizes converter efficiency.
The MAX8791 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
Features
♦ _{Single-Phase Synchronous MOSFET Driver}
♦ _{0.5Ω Low-Side On-Resistance}
♦ _{0.7Ω High-Side On-Resistance}
♦ _{8ns Propagation Delay}
♦ _{15ns Minimum Guaranteed Dead Time}
♦ _{Integrated Boost “Diode”}
♦ _{2V to 24V Input Voltage Range}
♦ _{Selectable Pulse-Skipping Mode}
♦ _{Low-Profile TQFN Package}
Ordering Information
PART
TEMP
RANGE
MAX8791GTA+
-40^oC to
+105^oC
+Denotes lead-free package.
PIN-
PACKAGE
8 TQFN
3mm x 3mm
PKG
CODE
TQ833+1
Typical Operating Circuit
INPUT (VIN)*
5V TO 24V
PWM SKIP
+5V BIAS
SUPPLY
PWM
DH
MAX8791
SKIP
BST
LX
VDD
DL
GND
PAD
VOUT (1.45V
AT 20A)
Pin Configuration
TOP VIEW
6
5
LX 7
DH 8
+
MAX8791
1
2
4 DL
3 GND
TQFN
3mm × 3mm
________________________________________________________________ Maxim Integrated Products 1
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.