MAX15070A_13 Datasheet, PDF (7/9 Pages) Maxim Integrated Products – 7A Sink, 3A Source, 12ns, SOT23 MOSFET Drivers

MAX15070A/MAX15070B
7A Sink, 3A Source,
12ns, SOT23 MOSFET Drivers
IN+
V_IL
P_OUT AND
N_OUT
CONNECTED
TOGETHER
V_IH
90%
10%
t_D-OFF
t_F
TIMING DIAGRAM
t_D-ON
t_R
V+
INPUT
V+
MAX15070A
MAX15070B
P_OUT
IN+
N_OUT
IN-
GND
OUTPUT
C_L
Figure 1. Timing Diagram and Test Circuit
TEST CIRCUIT
Detailed Description
Logic Inputs
The MAX15070A/MAX15070Bs’ logic inputs are pro-
tected against voltage spikes up to +16V, regardless of
the V+ voltage. The low 10pF input capacitance of the
inputs reduces loading and increases switching speed.
These ICs have two inputs that give the user greater
flexibility in controlling the MOSFET. Table 1 shows all
possible input combinations. The difference between the
MAX15070A and the MAX15070B is the input threshold
voltage. The MAX15070A has TTL logic-level thresholds,
Table 1. Truth Table
IN+
IN-
p-CHANNEL
L
L
Off
L
H
Off
H
L
On
H
H
Off
L = Logic-low, H = Logic-high.
n-CHANNEL
On
On
Off
On
while the MAX15070B has HNM (CMOS-like) logic-level
thresholds (see the Electrical Characteristics). Connect
IN+ to V+ or IN- to GND when not used. Alternatively,
the unused input can be used as an on/off control input
(Table 1).
Undervoltage Lockout (UVLO)
When V+ is below the UVLO threshold, the n-channel is
on and the p-channel is off, independent of the state of
the inputs. The UVLO is typically 3.45V with 200mV typi-
cal hysteresis to avoid chattering. A typical falling delay
of 2Fs makes the UVLO immune to narrow negative tran-
sients in noisy environments.
Driver Outputs
The ICs provide two separate outputs. One is an open-
drain p-channel, the other an open-drain n-channel. They
have distinct current sourcing/sinking capabilities to inde-
pendently control the rise and fall times of the MOSFET
gate. Add a resistor in series with P_OUT/N_OUT to slow
the corresponding rise/fall time of the MOSFET gate.
Maxim Integrated
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