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)： 38/44頁(yè)
文件大?。?/td> 3085K
代理商： TPS65020RHA
www.ti.com
VOUT
VDEFDCDC3
R1
R2
R2
R1
R2
VOUT
VDEFDCDC3
R2
(8)
VRTC Output
LDO1 and LDO2
Trespwron
Vcc-Filter
TPS65020
SLVS607–SEPTEMBER 2005
The VRTC output is typically connected to the Vcc_Batt pin of a Intel PXA270 processor. During power-up of the
processor, the TPS65020 internally switches from the LDO or the backup battery to the system voltage
connected at the VSYSIN pin (see
Figure 25
). It is recommended to add a capacitor of 4.7-
μ
F minimum to the
VRTC pin.
The LDOs default voltage is 1.1 V for LDO2 and 1.3 V for LDO1. They are intended to provide power to
VCC_PLL and the VCC_SRAM pin on a PXA270 processor. The minimum output capacitor required is 2.2
μ
F.
The LDOs output voltage is changed to different voltages between 1 V and 3.3 V using the I
2
C 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 providing 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
μ
A between a threshold of
0.25 V and 1 V for 128 cycles. A 1-nF capacitor gives a delay time of 100 ms.
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 10R and 1
μ
F is used to filter the switching spikes, generated by the dc-dc
converters. A larger resistor than 10R 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.
38
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