The logic inputs are high impedance and must not be left

floating. If the inputs are left open, OUT_ can go to an

threshold. Therefore, the PWM output from the controller

must assume proper state when powering up the device.

The MAX5054 has two logic inputs per driver providing

greater flexibility in controlling the MOSFET. Use IN_+ for

noninverting logic and IN_- for inverting logic operation.

Alternatively, the unused input can be used as an

ON/OFF function. Use IN_+ for active-low shutdown logic

and IN_- for active-high shutdown logic (see Figure 4).

See Table 1 for all possible input combinations.

Driver Output

and n-channel devices (totem pole) in the output stage

for the fast turn-on and turn-off high gate-charge switch-

ing MOSFETs. The peak source or sink current is typically

when in high state and is ground when in low state. The

source-/sink-current capability and faster switching

speeds. The propagation delays from the noninverting

and inverting logic inputs to outputs are matched to 2ns.

The break-before-make logic avoids any cross-conduc-

tion between the internal p- and n-channel devices, and

eliminates shoot-through currents reducing the quiescent

supply current.

Applications Information

RLC Series Circuit

circuit with a second-order characteristic equation. The

series RLC circuit has an undamped natural frequency

(

The damping ratio needs to be greater than 0.5 (ideally 1)

with the gate when driving a very low gate-charge

MOSFET, or when the driver is placed away from the

MOSFET. Use the following equation to calculate the

series resistor:

R

LLL

C

R

GATE

PSG

G

ON

≥

++

−

()

ϖ

ξ

0

1

2

=

++

×

=

×

++

()

()

LLL

C

R

LLL

C

PSG

G

ON

PSG

G

4A, 20ns, Dual MOSFET Drivers

10

______________________________________________________________________________________

MAX5054A

GND

INA-

INA+

OUTA

PWM

INPUT

ON

OFF

Figure 4. Unused Input as an ON/OFF Function (1/2 MAX5054A)

Table 1. MAX5054 Truth Table

INA+/INB+

INA-/INB-

OUTA/OUTB

Low

Low

Low

Low

High

Low

High

Low

High

High

High

Low

Table 2. MAX5055/MAX5056/MAX5057

Truth Table

NONINVERTING

IN_+

OUT_

Low

Low

High

High

INVERTING

IN_-

OUT_

Low

High

High

Low