參數(shù)資料
型號(hào)： TPS65020RHA
廠商： Texas Instruments, Inc.
英文描述： POWER MANAGEMENT IC FOR LI-ION POWERED SYSTEMS
中文描述： 電源管理IC鋰離子供電系統(tǒng)
文件頁(yè)數(shù)： 20/44頁(yè)
文件大?。?/td> 3085K
代理商： TPS65020RHA
www.ti.com
DETAILED DESCRIPTION
VRTC OUTPUT AND OPERATION WITH OR WITHOUT BACKUP BATTERY
The VRTC pin is an always-on output, intended to supply up to 20 mA to a permanently required rail. This is the
VCC_BATT rail of the Intel PXA270 processor for example.
RESPWRON
VR
TC
LDO
V
CC
VR
TC
V
ref
V
ref
V
ref
priority
#3
priority
#2
priority
#1
EN
V_VSYSIN
V_VBACKUP
VBACKUP
V_VBACKUP
VSYSIN
V_VSYSIN
STEP-DOWN CONVERTERS, VDCDC1, VDCDC2, and VDCDC3
The TPS65020 incorporates three synchronous step-down converters operating typically at 1.5 MHz fixed
frequency pulse width modulation (PWM) at moderate to heavy load currents. At light load currents, the
converters automatically enter the power save mode (PSM), and operate with pulse frequency modulation (PFM).
The VDCDC1 converter is capable of delivering 1.2 A output current, the VDCDC2 converter is capable of
delivering 1 A and the VDCDC3 converter is capable of delivering up to 800 mA.
TPS65020
SLVS607–SEPTEMBER 2005
In applications using a backup battery, the backup voltage can be either directly connected to the TPS65020
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 TPS65020 asserts
the RESPWRON signal if VRTC drops below 2.4 V. This, together with 250 mV at 20 mA drop out for the PMOS
switch means that the voltage applied at VBACKUP must be greater than 2.65 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 20 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
A.
B.
V_VSYSIN, V_VBACKUP thresholds: falling = 2.55 V, rising = 2.65 V
±
3%
RESPWRON thresholds: falling = 2.4 V, rising = 2.52 V
±
3%
Figure 25.
The converter output voltages can be programmed via the DEFDCDC1, DEFDCDC2 and DEFDCDC3 pins. The
20
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TPS65020RHAR 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(lèi)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
TPS65020RHARG4 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(lèi)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
TPS65020RHAT 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(lèi)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
TPS65020RHATG4 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(lèi)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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