參數(shù)資料
型號(hào)： 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(shù)： 33/47頁
文件大?。?/td> 1180K
代理商： TPS65021RHARG4
www.ti.com
VOUT
DEFDCDCx
=V
x
R1+R2
R2
R1=R2x
VOUT
VDEFDCDCx
-R2
()
(8)
VRTC Output
LDO1 and LDO2
TRESPWRON
t
=2
(reset)
x128x
(1V-0.25V)xC(reset)
2 A
m
()
(9)
VCC-Filter
SLVS613B – OCTOBER 2005 – REVISED JULY 2007
When a resistor divider is connected to DEFDCDCx, the output voltage can be set from 0.6 V up to the input
voltage V(bat). The total resistance (R1+R2) of the voltage divider should be kept in the 1-MR range in order to
maintain a high efficiency at light load.
V(DEFDCDCx) = 0.6 V
The VRTC output is typically connected to the Vcc_Batt pin of a Intel PXA270 processor. During power-up of
the processor, the TPS65021 internally switches from the LDO or the backup battery to the system voltage
connected at the VSYSIN pin (see Figure 25). It is recommended that a 4.7-
μF (minimum) capacitor be added to
the VRTC pin.
The LDOs in the TPS65021 are general-purpose LDOs which are stable using ceramics capacitors. The
minimum output capacitor required is 2.2
μF. The LDOs output voltage can be changed to different voltages
between 1 V and 3.3 V using the I2C interface. Therefore, they can also be used as general-purpose LDOs in
applications powering processors different from PXA270. The supply voltage for the LDOs needs to be
connected to the VINLDO pin, giving the flexibility to connect the lowest voltage available in the system and
provides the highest efficiency.
This is the input to a capacitor that defines the reset delay time after the voltage at VRTC rises above 2.52 V.
The timing is generated by charging and discharging the capacitor with a current of 2
μA between a threshold of
0.25 V and 1 V for 128 cycles. A 1-nF capacitor gives a delay time of 100 ms.
Where:
t(reset) is the reset delay time
C(reset) is the capacitor connected to the TRESPWRON pin
An RC filter connected at the VCC input is used to keep noise from the internal supply for the bandgap and
other analog circuitry. A typical value of 10 R and 1
μF is used to filter the switching spikes, generated by the
dc-dc converters. A larger resistor than 10 R should not be used because the current into VCC of up to 3 mA
causes a voltage drop at the resistor causing the undervoltage lockout circuitry connected at VCC internally to
switch off too early.
39
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)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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