MAX8791/MAX8791B
Single-Phase, Synchronous MOSFET Drivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
DD
= V
SKIP
= 5V, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to GND...............…………………….………….. -0.3V to +6V
SKIP to GND..................………………………………-0.3V to +6V
PWM to GND ................……………………………….-0.3V to +6V
DL to GND..................................................-0.3V to (V
DD
+ 0.3V)
BST to GND ............................................................-0.3V to +36V
DH to LX....................................................-0.3V to (V
BST
+ 0.3V)
BST to V
DD
.............................................................-0.3V to +30V
BST to LX ................…………………………………...-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
8-Pin 3mm x 3mm TQFN
(derate 23.8mW/°C above +70°C).............................1904mW
Operating Temperature Range .........................-40°C to +105°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V
DD
4.20 5.50 V
Rising edge, PWM disabled below this level 3.7
V
DD
Undervoltage
Lockout Threshold
V
UVLO
VDD
Falling edge, PWM disabled below this level 3.0 3.5 4.0
V
PWM = open; after the shutdown hold time has expired 0.08 0.2
SKIP = GND, PWM = GND,
LX = GND (after zero crossing)
0.25 0.5
Quiescent Supply
Current (V
DD
)
I
DD
SKIP = GND or V
DD
, PWM = V
DD
, V
BST
= 5V 0.6 1.5
mA
DRIVERS
t
ON(MIN)
Minimum on-time 50
PWM Pulse Width
t
OFF
MIN
Minimum off-time 300
ns
DL Propagation Delay t
PWM-DL
PWM high to DL low 10 ns
DH Propagation Delay t
PWM-DH
PWM low to DH low 14 ns
T
A
= 0°C to +85°C 15 30
DL-to-DH Dead Time t
DL-DH
DL falling to DH rising
T
A
= -40°C to +105°C 15
ns
T
A
= 0°C to +85°C 15 30
DH-to-DL Dead Time t
DH-DL
DH falling to DL rising
T
A
= -40°C to +105°C 15
ns
t
F_DL
Falling, 3.0nF load 12
DL Transition Time
t
R_DL
Rising, 3.0nF load 14
ns
t
F_DH
Falling, 3.0nF load 8
DH Transition Time
t
R_DH
Rising, 3.0nF load 10
ns
DH, high state (pullup) 0.9 2.5
DH Driver On-Resistance R
ON(DH)
BST-LX forced to 5V
DH, low state (pulldown) 0.7 2.3
Ω
DL, high state (pullup) 0.7 1.8
DL Driver On-Resistance R
ON(DL)
DL, low state (pulldown) 0.5 1.2
Ω
D H D r i ver S our ce C ur r ent I
DH_SOURCE
DH forced to 2.5V, BST - LX forced to 5V 2.2 A
DH Driver Sink Current I
DH_SINK
DH forced to 2.5V, BST - LX forced to 5V 2.7 A
DL Driver Source Current I
DL_SOURCE
DL forced to 2.5V 2.7 A
DL Driver Sink Current I
DL_SINK
DL forced to 2.5V 8 A
Zero-Crossing Threshold V
ZX
GND - LX, SKIP = GND 3 mV
Boost On-Resistance R
ON
BST
V
D D
= 5V , D H = LX = G N D ( p ul l d ow n state) , I
BS T
= 10m A512Ω
