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| 型号： | TPS65020RHAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC40 |
| 封装： | GREEN, PLASTIC, QFN-40 |
| 文件页数： | 33/48页 |
| 文件大小： | 1182K |
| 代理商： | TPS65020RHAR |
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VRTC Output
LDO1 and LDO2
TRESPWRON
t
=2
(reset)
x128x
(1V-0.25V)xC(reset)
2 A
m
()
(9)
VCC-Filter
SLVS607B – SEPTEMBER 2005 – REVISED JULY 2007
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-
μF 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
μF.
The LDOs output voltage is 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 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
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 prevent noise from the internal supply for the bandgap and
other analog circuitry. A typical resistor value of 10
and 1 μF is used to filter the switching spikes generated by
the dc-dc converters. A resistor larger than 10
should not be used because the current (up to 3 mA) into VCC
causes a voltage drop at the resistor. This causes the undervoltage lockout circuitry connected internally at VCC
to switch off too early.
39
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