PIN NAME FUNCTION
10 FAULT
Open-Drain Active-Low Fault Output. FAULT goes low during an overcurrent condition and thermal
shutdown.
11 EN
Active-Low Enable Input. Drive EN low to enable the driver outputs. Drive EN high to tri-state the driver
outputs.
EP GND Ground
14, 15 M2 Motor Driver Output 2. See the Function Tables for more information. Connect both M2 pins together.
12 V
REF
Reference Voltage Input. The voltage applied to V
VREF
sets the maximum motor current during external
V
VREF
-based current regulation. Set V
VREF
<V
REF_TH
for internal V
VREF
-based current regulation.
See the Function Tables and the Current Regulation section for more information.
- EP Exposed Pad. Connect to ground.
INPUTS OUTPUTS
OPERATING MODE
EN PWM DIR M1 M2
1 X X High-Impedance High-Impedance Shutdown
0 0 X GND GND Brake
0 1 0 GND V
DD
Counter-Clockwise/Reverse
0 1 1 V
DD
GND Clockwise/Forward
INPUTS
OPERATING MODE (SEE TABLE 1)
EN V
REF
MODE V
SNS
0 < 0.2V X < 0.1V Normal PWM Operation. No current regulation.
0 < 0.2V V
MODE
< 0.5V > 0.1V
Current regulation based on 15μs (typ) xed off-time control
with fast decay using internal V
REF
.
0 < 0.2V 0.5V < V
MODE
< 1V > 0.1V
Current regulation based on 25% current ripple fast decay
using internal V
REF
.
0 < 0.2V V
MODE
> 1.5V > 0.1V
Current regulation based on 15μs (typ) xed off-time control
with slow decay using internal V
REF
.
0 > 0.4V X < V
VREF
/10 Normal PWM Operation. No current regulation.
0 > 0.4V V
MODE
< 0.5V > V
VREF
/10
Current regulation based on xed TOFF-time control with fast
decay using external V
REF
.
0 > 0.4V 0.5V < V
MODE
< 1V > V
VREF
/10
Current regulation based on 25% current ripple fast decay
using external V
REF
.
0 > 0.4V V
MODE
> 1.5V > V
VREF
/10
Current regulation based on xed TOFF-time control with
slow decay using external V
REF
.
Current Regulation Logic
PWM/DIR Control Logic
MAX14871 4.5V to 36V Full-Bridge DC Motor Driver
www.maximintegrated.com
Maxim Integrated
│
9
Pin Description (continued)
Function Table
X = Don’t care
X = Don’t care
