MAX14871_14 Datasheet, PDF (9/15 Pages) Maxim Integrated Products – 4.5V to 36V Full-Bridge DC Motor Driver

MAX14871
4.5V to 36V Full-Bridge DC Motor Driver
Pin Description (continued)
PIN
10
11
EP
14, 15
12
-
NAME
FAULT
EN
GND
M2
V_REF
EP
FUNCTION
Open-Drain Active-Low Fault Output. FAULT goes low during an overcurrent condition and thermal
shutdown.
Active-Low Enable Input. Drive EN low to enable the driver outputs. Drive EN high to tri-state the driver
outputs.
Ground
Motor Driver Output 2. See the Function Tables for more information. Connect both M2 pins together.
Reference Voltage Input. The voltage applied to V_VREF sets the maximum motor current during external
VVREF-based current regulation. Set VVREF<VREF_TH for internal VVREF-based current regulation.
See the Function Tables and the Current Regulation section for more information.
Exposed Pad. Connect to ground.
Function Table
PWM/DIR Control Logic
INPUTS
EN
PWM
1
X
0
0
0
1
0
1
X = Don’t care
OUTPUTS
DIR
M1
M2
X
High-Impedance High-Impedance
X
GND
GND
0
GND
1
V_DD
V_DD
GND
OPERATING MODE
Shutdown
Brake
Counter-Clockwise/Reverse
Clockwise/Forward
Current Regulation Logic
INPUTS
EN
V_REF
0
< 0.2V
MODE
X
0
< 0.2V
V_MODE < 0.5V
0
< 0.2V
0.5V < V_MODE < 1V
0
< 0.2V
V_MODE > 1.5V
0
> 0.4V
X
0
> 0.4V
V_MODE < 0.5V
0
> 0.4V
0.5V < V_MODE < 1V
0
> 0.4V
X = Don’t care
V_MODE > 1.5V
V_SNS
< 0.1V
> 0.1V
> 0.1V
> 0.1V
< V_VREF/10
> V_VREF/10
> V_VREF/10
> V_VREF/10
OPERATING MODE (SEE TABLE 1)
Normal PWM Operation. No current regulation.
Current regulation based on 15μs (typ) fixed off-time control
with fast decay using internal V_REF.
Current regulation based on 25% current ripple fast decay
using internal V_REF.
Current regulation based on 15μs (typ) fixed off-time control
with slow decay using internal V_REF.
Normal PWM Operation. No current regulation.
Current regulation based on fixed TOFF-time control with fast
decay using external V_REF.
Current regulation based on 25% current ripple fast decay
using external V_REF.
Current regulation based on fixed TOFF-time control with
slow decay using external V_REF.
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