參數資料
型號： TPS65021RHARG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC40
封裝： 6 X 6 MM, GREEN, PLASTIC, MO-220/VJJD-2, QFN-40
文件頁數： 13/47頁
文件大小： 1180K
代理商： TPS65021RHARG4
www.ti.com
DETAILED DESCRIPTION
VRTC OUTPUT AND OPERATION WITH OR WITHOUT BACKUP BATTERY
SLVS613B – OCTOBER 2005 – REVISED JULY 2007
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 TPS65021
VBACKUP pin if a Li-Ion cell is used, or via a boost converter (e.g. 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 TPS65021
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 TPS65021 there is a switch (Vmax switch) which 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.
20
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相關代理商/技術參數
參數描述
TPS65021RHAT 功能描述:電池管理 6-Ch Pwr Mgmt IC for Li-Ion Systems RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TPS65021RHATG4 功能描述:電池管理 6-Ch Pwr Mgmt IC for Li-Ion Systems RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TPS65022RHAR 功能描述:電池管理 Pwr Mgmt IC for Li-Ion Pwred Sys RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TPS65022RHARG4 功能描述:電池管理 Pwr Mgmt IC for Li-Ion Pwred Sys RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TPS65022RHAT 功能描述:電池管理 Pwr Mgmt IC for Li-Ion Pwred Sys RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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