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TPS65381A-Q1 Datasheet(PDF) 8 Page - Texas Instruments

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Part # TPS65381A-Q1
Description  Multirail Power Supply for Microcontrollers in Safety-Relevant Applications
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65381A-Q1 Datasheet(HTML) 8 Page - Texas Instruments

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8
TPS65381A-Q1
SLVSDJ1A – JULY 2016 – REVISED MAY 2017
www.ti.com
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Product Folder Links: TPS65381A-Q1
Specifications
Copyright © 2016–2017, Texas Instruments Incorporated
(1)
VBATP should be connected to VBAT_SAFING.
(2)
VBAT_SAFING has a supply high enough to power the VMON block and internal rail AVDD_VMON above AVDD_VMON_UV.
(3)
The device may power up when VBATP is less than 5.8 V, but it will always power up when VBATP is 5.8V or greater, while
VBAT_SAFING has a supply high enough to power the VMON block and internal rail AVDD_VMON above AVDD_VMON_UV.
(4)
Under slow VBAT ramp-down and when VDD3/5 rail is configured as a 5-V rail, the NRES output can be pulled low when VBAT is at
approximately 6.3 V. This occurs because of an undervoltage transient on the VDD3/5 rail.
Under slow VBAT ramp-up and when VDD3/5 rail is configured as a 5-V rail, the NRES output can be pulled low when VBAT is at
approximately 6.6 V. This occurs because of an undervoltage transient on VDD3/5 rail. Under similar conditions, undervoltage transients
are observed on VDD5 and VSOUT1 rails (refer to Device Behavior Under Slow VBAT Ramp-Up and Ramp-Down).
(5)
The recommended maximum operating voltage for VBATP and VBAT_SAFING is listed as 34 V, just below the overvoltage detection
thresholds for VBATP, VBATP_OVrise and VBATP_OVfall. TI recommends enabling overvoltage detection on VBATP (default is enabled,
MASK_VBATP_OV = 0). TI also recommends evaluating the thermal and power dissipation of the device in the application and ensure
the design has adequate thermal management for operation at the necessary supply voltage level.
(6)
The device will remain on if VBATP drops from 5.8V down to VBATP_UVoff threshold or another voltage monitor detects an
undervotlage on a specific rail and changes the device state. VBAT_UVoff can be detected at 4.5 V but could be detected as low as 4.2
V. VBAT_SAFING has a supply high enough to power the VMON block and internal rail AVDD_VMON above AVDD_VMON_UV.
4.3
Recommended Operating Conditions
Over operating temperature range and with respect to the GND and PGND (GND = PGND) pins (unless otherwise noted)
POS
MIN
MAX
UNIT
M1.20a
Operating ambient temperature, TA
–40
125
°C
R1.1
Minimum input supply voltage on VBATP for initial power up (POS 6.2, VBATP_UVon)
(1) (2)
5.8(3)
V
R1.2
Input supply voltage on VBATP (1)(2)(4)
To support operation when VBATP is between 5.8 V and 7 V, the device remains functional. Some rails can be in
dropout or undervoltage depending on actual input supply and the configuration of the specific regulator.
VDD6 can be in dropout mode (100% duty cycle)
VDD3/5 configured for 5-V output can be in dropout. If the output reaches VDD3/5_UV threshold, the device
transitions to the RESET state because of a VDD3/5 undervoltage event. If VDD3/5 is configured for 3.3-V output
it remains functional.
VDD5 can be in dropout. If output reaches the VDD5_UV threshold, the device indicates the undervoltage event
through the VDD5_UV status bit.
VSOUT1 can be in dropout depending on configuration. If output reaches VSOUT1_UV threshold, the device
indicates the undervoltage event through the VSOUT1_UV status bit.
5.8
34(5)
V
R1.3
Input supply voltage on VBATP after initial power up, functional operation during low input supply voltage events, (POS
6.1, VBATP_UVoff):
(1) (6)
The device remains functional. Some rails can be in dropout or undervoltage depending on actual input supply
and the configuration of the specific regulator.
VDD6 is in dropout mode (100% duty cycle).
VDD3/5 configured for 5-V output can be in dropout. If the output reaches VDD3/5_UV threshold, the device
transitions to the RESET state because of a VDD3/5 undervoltage event. If VDD3/5 is configured for 3.3-V output
it remains functional.
VDD5 can be in dropout. If the output reaches VDD5_UV threshold, the device indicates the undervoltage event
through the VDD5_UV status bit.
VSOUT1 may be in dropout depending on configuration, if output reaches VSOUT1_UV threshold the device
indicates the undervoltage event through the VSOUT1_UV status bit.
4.5
5.8
V
R1.4
VDDIO supply-voltage range
3.3
5
V
R1.5
Current consumption in standby mode (all regulator outputs disabled)
IGN = 0 V, CANWU = 0 V, 5.8 V
≤ VBAT ≤ 20 V for TJ < 85°C or 5.8 V ≤ VBAT ≤ 14 V tor TJ = 125°C
75
µA


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