DRV8808 Datasheet, PDF (24/38 Pages) Texas Instruments – COMBINATION MOTOR DRIVER WITH DC-DC CONVERTER

DRV8808
SLVS857A – DECEMBER 2009 – REVISED AUGUST 2011
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VM
VthVM+
(CSELECT = Open)
(VM = 6 V)
VthVM–
(VM = 5 V)
Capture CSELECT
Then Start Charge Pump
VCP
DCDC_B
DCDC_C
(3.3 V to LDO_IN)
CP Start to DC-DC Delay
10 ms
(Note A)
40 ms
LDO
(1.2 V)
nORT
L
120 ms
(20 ms + 100 ms)
Protection Mask
(OVP, UVP for Ch-A/B/C and LDO)
H
A. Charge-pump wakeup delay, from 10 ms to 20 ms due to asynchronous event capture.
B. LDO Enable follows DC/DC B Enable during power up and can be controlled using the SETUP register after power
up. In this case, since LDO_IN is driven by DC/DC Channel C, LDO_OUT will follow DC/DC Channel C.
Figure 12. Power-up Timing (Power up With LDO, Supplied by DCDC_C)
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