TPS70345 Datasheet, PDF (31/35 Pages) Texas Instruments – DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS

TPS70345, TPS70348, TPS70351, TPS70358, TPS70302
DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS
WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS
SLVS285A – AUGUST 2000 – REVISED OCTOBER 2002
APPLICATION INFORMATION
split voltage DSP application (continued)
Figure 44 shows a typical application where the TPS70351 is powering up a DSP. In this application, by pulling
up the SEQ pin, V_OUT2(Core) is powered up first, and then V_OUT1(I/O).
TPS70351 PWP
5V
VIN1
VOUT1
3.3 V
DSP
I/O
0.22 µF
VSENSE1
22 µF _{250 kΩ}
0.22 µF
VIN2
PG1
MR2
RESET
MR2 _VIN
PG1
250 kΩ
RESET
>2 V EN
<0.7 V
EN
SEQ
MR1
VSENSE2
VOUT2
MR1 _VIN
47 µF
1.8 V
Core
EN
SEQ
VOUT2
(Core)
VOUT1
(I/O)
PG1
95%
83%
95%
83%
RESET
t1
(see Note A)
120ms
NOTE A: t1 – Time at which both Vout1 and Vout2 are greater than the PG1 thresholds and MR1 is logic high.
Figure 44. Application Timing Diagram (SEQ = High)
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