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