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TPS65022 Datasheet(PDF) 18 Page - Texas Instruments

Part # TPS65022
Description  Power Management IC for Li-Ion Powered Systems
Download  47 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65022 Datasheet(HTML) 18 Page - Texas Instruments

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TPS65022
SLVS667B – JULY 2006 – REVISED JANUARY 2016
www.ti.com
7.3 Feature Description
7.3.1 VRTC Output and Operation With or Without Backup Battery
The VRTC pin is an always-on output, intended to supply up to 30 mA to a permanently required rail. This is the
VCC_BATT rail of the Intel® PXA270 Bulverde processor for example.
In applications using a backup battery, the backup voltage can be either directly connected to the TPS65022
VBACKUP pin if a Li-Ion cell is used, or through a boost converter (TPS61070) if a single NiMH battery is used.
The voltage applied to the VBACKUP pin is fed through a PMOS switch to the VRTC pin. The TPS65022 asserts
the RESPWRON signal if VRTC drops below 2.4 V. This, together with 375 mV at 30 mA drop out for the PMOS
switch means that the voltage applied at VBACKUP must be greater than 2.775 V for normal system operation.
When the voltage at the VSYSIN pin exceeds 2.65 V, the path from VBACKUP to VRTC is cut, and VRTC is
supplied by a similar PMOS switch from the voltage source connected to the VSYSIN input. Typically this is the
VDCDC1 converter but can be any voltage source within the appropriate range.
In systems where no backup battery is used, the VBACKUP pin is connected to GND. In this case, a low power
LDO is enabled, supplied from VCC and capable of delivering 30 mA to the 3-V output. This LDO is disabled if
the voltage at the VSYSIN input exceeds 2.65 V. VRTC is then supplied from the external source connected to
this pin as previously described.
Inside TPS65022 there is a switch (Vmax switch) that selects the higher voltage between VCC and VBACKUP.
This is used as the supply voltage for some basic functions. The functions powered from the output of the Vmax
switch are:
INT output
RESPWRON output
HOT_RESET input
LOW_BATT output
PWRFAIL output
Enable pins for DC-DC converters, LDO1 and LDO2
Undervoltage lockout comparator (UVLO)
Reference system with low frequency timing oscillators
LOW_BATT and PWRFAIL comparators
The main 1.5-MHz oscillator, and the I2C interface are only powered from VCC.
18
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Copyright © 2006–2016, Texas Instruments Incorporated
Product Folder Links: TPS65022


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