MAX8791GTA+ Maxim Integrated Products, MAX8791GTA+ Datasheet - Page 5

• Manufacturer Part Number: MAX8791GTA+
• Description: IC MOSFET DRIVER 8-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8791GTA+

• Configuration: High and Low Side, Synchronous
• Input Type: PWM
• Delay Time: 14ns
• Current - Peak: 2.7A
• Number Of Configurations: 1
• Number Of Outputs: 2
• High Side Voltage - Max (bootstrap): 36V
• Voltage - Supply: 4.2 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(Circuit of Figure 1, V
PIN
—
1
2
3
4
5
6
7
8
Single-Phase, Synchronous MOSFET Drivers
NAME
PWM
GND
SKIP
BST
V
DH
DL
LX
EP
DD
V
PWM
V
V
V
DH
DL
LX
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:
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.
Power Ground for the DL Gate Drivers and Analog Ground. Connect exposed pad to GND.
PWM Low-Side Gate-Driver Output. Swings between GND and V
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:
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.
Switching Node and Inductor Connection. Low-power supply for the DH high-side gate driver. LX connects to
the skip-mode zero-crossing comparator.
External High-Side nMOSFET Gate-Driver Output. Swings between LX and BST.
Exposed Pad. Connect to ground through multiple vias to reduce the thermal impedance.
_______________________________________________________________________________________
DD
Logic high: DH = high (BST), DL = low (PGND).
Midlevel: After the midlevel hold time expires, the controller enters standby mode. DH and DL pulled low.
Logic low: DH = low (LX), DL = high (V
SKIP = V
SKIP = GND SKIP mode
= 5V, C
(PWM = MID TO LOW TO MID)
SWITCHING WAVEFORMS
DD
DH
PWM mode
= 3nF, C
DL
= 3nF, T
MAX8791 toc11
Typical Operating Characteristics (continued)
5V
5V/div
0
5V
5V/div
0
0
10V/div
0
10V/div
A
= +25°C, unless otherwise noted.)
DD
) when SKIP = high.
FUNCTION
V
PWM
V
V
V
DH
DL
LX
(PWM = HIGH TO MID TO HIGH)
SWITCHING WAVEFORMS
DD
. DL forced high in shutdown.
MAX8791 toc12
Pin Description
10V
10V/div
10V/div
5V
5V/div
0
0
5V/div
0
15V
0
5