MAX14870 Datasheet, PDF (4/15 Pages) Maxim Integrated Products – Full-Bridge DC Motor Drivers

MAX14870/MAX14872
Compact 4.5V to 36V
Full-Bridge DC Motor Drivers
AC Electrical Characteristics
(V_DD = 4.5V to 36V, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at VDD = 12V, T_A = +25°C) (Note 2)
PARAMETER
PWM Frequency
Dead Time
M1, M2 Slew Rate
SYMBOL
f_SW
t_DEAD
SR
EN = Low
CONDITIONS
MAX14870,
switching signal
applied at PWM
MAX14872,
switching signal
applied at FWD
or REV
MIN
TYP MAX UNITS
50
kHz
50
140
ns
200
V/μs
M1, M2 High-Side Propagation
Delay
t_PR
R_L = 1kΩ, C_L = 50pF,
PWM/FWD/DIR/REV rising, Figure 1
620
ns
M1, M2 Low-Side Propagation
Delay
t_PF
R_L = 1kΩ, C_L = 50pF,
PWM/FWD/DIR/REV falling, Figure 1
583
ns
Current Regulation Fixed
Off-Time
Current Regulation Minimum
On-Time
Overcurrent Blanking Time
Overcurrent Autoretry Timeout
Enable Turn-on Delay
t_OFF
t_{CR_BL}
t_{OC_BL}
t_{OC_TO}
t_{EN_ON}
PWM/FWD = High, EN = Low,
V_SNS > V_{SNS_TH}
PWM/FWD = High, EN = Low,
V_SNS > V_{SNS_TH}
M1/M2 is shorted to VDD or GND,
Figure 2
PWM/FWD = High, EN = Low,
I_M or I_M2 > I_{M_OL}, Figure 2
PWM/FWD = High, R_L = 1kΩ,
C_L = 50pF, EN falling,
M1/M2 rising to 10%, Figure 3
7.8
15
22
μs
2.5
μs
1
μs
2
ms
23
μs
Enable Turn-off Delay
t_{EN_OFF}
PWM/FWD = High, R_L = 1kΩ,
C_L = 50pF, EN rising,
M1/M2 falling to 90%, Figure 3
50
μs
Note 2: All units are production tested at T_A = +25°C. Specifications over temperature are guaranteed by design.
Note 3: V_{SNS_TH} is the threshold voltage to turn on current regulation.
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