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19-0628; Rev 2; 1/10
Single-Phase, Synchronous MOSFET Drivers
General Description
The MAX8791/MAX8791B are single-phase, synchro-
nous, noninverting MOSFET drivers. The MAX8791/
MAX8791B are 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 drivers are optimized to drive 3nF capaci-
tive 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 MAX8791/MAX8791B are available in a small, lead-
free, 8-pin, 3mm x 3mm TQFN package.
Applications
Features
o Single-Phase, Synchronous MOSFET Drivers
o 0.5 ? Low-Side On-Resistance
o 0.7 ? High-Side On-Resistance
o 8ns Propagation Delay
o 15ns Minimum Guaranteed Dead Time
o Integrated Boost “Diode”
o 2V to 24V Input Voltage Range
o Selectable Pulse-Skipping Mode
o Low-Profile TQFN Package
Ordering Information
Notebooks/Desktops/Servers
CPU Core Power Supplies
Multiphase Step-Down Converters
PART
MAX8791GTA+
MAX8791BGTA+
TEMP RANGE
-40 o C to +105 o C
-40 o C to +105 o C
PIN-PACKAGE
8 TQFN-EP*
8 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
INPUT (V IN )*
5V TO 24V
Pin Configuration
PWM
MAX8791
DH
TOP VIEW
6
5
PWM SKIP
+5V BIAS
SUPPLY
MAX8791B
SKIP
V DD
BST
LX
DL
V OUT (1.45V
AT 20A)
LX 7
DH 8
+
MAX8791
MAX8791B
1
2
4 DL
3 GND
PAD
GND
TQFN
3mm × 3mm
________________________________________________________________ Maxim Integrated Products
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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