DRV8808 Datasheet, PDF (8/38 Pages) Texas Instruments – COMBINATION MOTOR DRIVER WITH DC-DC CONVERTER

DRV8808
SLVS857A – DECEMBER 2009 – REVISED AUGUST 2011
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ELECTRICAL CHARACTERISTICS (continued)
T_J = 0°C to 135°C, V_M = 7 V to 38 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
I_{O ODx3}
R_DSON ⁽⁷⁾
L
Output current (DC) at low V_M
FET on-resistance at 0.8 A for
OD_x V_M > 15 V
Inductor
C
Capacitor
Three DC-DC Converter Protection
V_M = 7 V, V_O = 3.3 V
T_J = 70 °C
T_J = 135 °C
V_OUT = 1.0 V
V_OUT ≥ 3.3 V
V_OUT = 1.0 V
V_OUT ≥ 3.3 V
1.2
A
0.85 1.05
Ω
1
1.2
150
μH
330
270
330
μF
220
I_{O DD ODx}
Overcurrent detect for OD_x
source
Peak current in each ON cycle
1.35
2.7
A
t_ODXdeg
t_ODXSD
Cycle by cycle Idetect deglitch
dc-dc shutdown filter
Number of consecutive cycles with Idetect
100
200
400
ns
4
chop
cycles
V_ovpx
Overvoltage protection
% to nominal Voutx detected at VFB
(VFB increasing)
25
30
35
%
V_uvpx
Undervoltage protection
% to nominal Voutx detected at VFB
(VFB decreasing)
–25
–30
–35
%
t_VXdeg
UVP/OVP deglitch time
t_sst
Start-up time with soft start
V_stover
Start-up overshoot
V_M Supervisory^{(8) (9)}
Vth_VM–
nORT, for V_M low threshold
Vth_VM+
nORT, for V_M high threshold
Vth_VMh
Vth_VM2
nORT, for V_M detect hysteresis
For motor driver off⁽¹⁰⁾
t_VMfilt
Vth V_M monitor filtering time
t_VM2filt
Vth V_M2 monitor filtering time
Thermal Shutdown: TSD ^{(11) (12)}
Ratio to Vo
V_M decreasing
V_M increasing
Vth_VM+ – Vth_VM–
For Vth V_M detect
For Vth V_M2 detect
3
8
13
μs
56 ms
3
%
4.5
5
6
V
5.5
6 6.79
V
0.5
1
V
15
V
4
30
μs
30
60 ms
T_TSD
Thermal shutdown set points
t_TSDdeg
TSD deglitch time
Temperature Warning: Pre-TSD^{(13) (12)}
150
170
190
°C
30
60
90
μs
PreTSD
Temperature warning
Assert at TH_OUT pin
115
135
155
°C
Open-drain outputs (nORT, Logic_OUT, TH_OUT)
V_OH
V_OL ⁽¹⁴⁾
I_OL ⁽¹⁴⁾
t_r ⁽¹⁵⁾
t_f ⁽¹⁵⁾
High-state voltage
Low-state voltage
Low-state sink current
Rise time
Fall time
RL = 1 kΩ to 3.3 V
RL = 1 kΩ to 3.3 V
Vo = 0.25 V
10% to 90%
90% to 10%
3
V
0.3
V
2
mA
1
μs
50
ns
(7) R_DSON at T = 135°C guaranteed by characterization. Production test will be done at T = 25°C/70°C.
(8) V_M must be V_M > Vth_VM+ to start up internal dc-dc converter.
(9) When V_M goes down below Vth_VM+, the VUVPx (undervoltage protection in dc-dc) are masked. The dc-dc converter is shut off by nORT
assertion at Vth_{VM –}.
(10) No nORT assertion to Vth_VM2 detection.
(11) TSD does not need thermal hysteresis.
(12) Parametric guaranteed by characterization. Not tested in production.
(13) PreTSD does not need thermal hysteresis.
(14) Production test only measures Vol and Iol to ensure timing.
(15) t_r and t_f dominated by external capacitance, pullup resistance, and open-drain NMOS R_DSON.
8
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