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PDF MAX8791B Data sheet ( Hoja de datos )
| Número de pieza | MAX8791B | |
| Descripción | Single-Phase Synchronous MOSFET Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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
Notebooks/Desktops/Servers
CPU Core Power Supplies
Multiphase Step-Down Converters
Features
o Single-Phase, Synchronous MOSFET Drivers
o 0.5Ω Low-Side On-Resistance
o 0.7Ω 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
PART
TEMP RANGE PIN-PACKAGE
MAX8791GTA+
MAX8791BGTA+
-40oC to +105oC
-40oC to +105oC
8 TQFN-EP*
8 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
PWM SKIP
+5V BIAS
SUPPLY
PWM DH
MAX8791
MAX8791B
SKIP BST
LX
VDD
DL
GND
PAD
INPUT (VIN)*
5V TO 24V
VOUT (1.45V
AT 20A)
Pin Configuration
TOP VIEW
65
LX 7
DH 8
MAX8791
MAX8791B
+
12
4 DL
3 GND
TQFN
3mm × 3mm
________________________________________________________________ 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.
1 page  
Single-Phase, Synchronous MOSFET Drivers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VDD = 5V, CDH = 3nF, CDL = 3nF, TA = +25°C, unless otherwise noted.)
VPWM
VDL
VLX
SWITCHING WAVEFORMS
(PWM = MID TO LOW TO MID)
MAX8791 toc11
5V
5V/div
0
5V
5V/div
0
0
10V/div
0
VDH 10V/div
VPWM
VDL
VLX
VDH
SWITCHING WAVEFORMS
(PWM = HIGH TO MID TO HIGH)
MAX8791 toc12
5V
5V/div
0
0
5V/div
10V
10V/div
0
15V
10V/div
0
Pin Description
PIN NAME
FUNCTION
1 BST Boost Flying-Capacitor Connection. Gate-drive power supply for DH high-side gate driver. Connect a 0.1µF or
0.22µF capacitor between BST and LX.
PWM Input Pin. Noninverting DH control input from the controller IC:
Logic high: DH = high (BST), DL = low (PGND).
2
PWM
Midlevel: After the midlevel hold time expires, the controller enters standby mode. DH and DL pulled low.
Logic low: DH = low (LX), DL = high (VDD) when SKIP = high.
Internal pullup and pulldown resistors create the midlevel and prevent the controller from triggering an on-time if
this input is left unconnected (not soldered properly) or driven by a high impedance.
3 GND Power Ground for the DL Gate Drivers and Analog Ground. Connect exposed pad to GND.
4 DL PWM Low-Side Gate-Driver Output. Swings between GND and VDD. DL forced high in shutdown.
5
VDD
Supply Voltage Input for the DL Gate Drivers. Connect to 4.2V to 5.5V supply and bypass to GND with a 1µF
ceramic capacitor.
Pulse-Skipping Mode Pin. Enable pulse-skipping mode (zero-crossing comparator enabled) when the driver is
operating in SKIP mode:
6
SKIP
SKIP = VDD PWM mode
SKIP = GND SKIP mode
An internal pulldown current pulls the controller into the low-power pulse-skipping state if this input is left
unconnected (not soldered properly) or driven by a high impedance.
7 LX Switching Node and Inductor Connection. Low-power supply for the DH high-side gate driver. LX connects to
the skip-mode zero-crossing comparator.
8 DH External High-Side nMOSFET Gate-Driver Output. Swings between LX and BST.
— EP Exposed Pad. Connect to ground through multiple vias to reduce the thermal impedance.
_______________________________________________________________________________________ 5
5 Page 
Single-Phase, Synchronous MOSFET Drivers
PROCESS: BiCMOS
Chip Information
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in
the package code indicates RoHS status only. Package draw-
ings may show a different suffix character, but the drawing per-
tains to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
8 TDFN-EP
TQ833+1
21-0136
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX8791B.PDF ] | |
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