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| 型号： | TPS65040ZQER |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA71 |
| 封装： | 5 X 5 MM, 0.50 MM PITCH, GREEN, PLASTIC, MICRO, BGA-71 |
| 文件页数： | 47/73页 |
| 文件大小： | 1928K |
| 代理商： | TPS65040ZQER |
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V11_28TX
PA_VDD
V12_V28RX
SLVS708B – NOVEMBER 2006 – REVISED APRIL 2007
V11_V28TX is a high-performance LDO having a 2.85-V output voltage. The output PMOS of the LDO turns off
when the load current exceeds the limit value of the current-limit protection circuit and stops the power supply.
When the load current falls to under-the-limit values, the current-limit state is released. This LDO has a
low-current mode and a high-current mode, corresponding to light-load and heavy-load conditions, respectively.
The mode is changed automatically. The LDO on/off is controlled by the WRFON pin and r[PSCNT11]. Register
command r[PSCNT11] can be controlled through the serial interface; the default is 0. Note: Turn off this LDO
when VBAT < 3.1 V. The SERIAL INTERFACE Section explains this in detail. On/off control of V11_V28TX is
shown in Table 3.
Table 3. V11_V28TX ON/OFF Control
REG_EN(1)
VIO1V8(1)
WRFON
r[PSCNT11]
V11_V28TX
1
ON
1
0
OFF
1
0
1
OFF
1
0
OFF
0
Don't Care
OFF
1
0
Don't Care
OFF
(1)
REG_EN and VIO1V8 sequence is described in SEQUENCE CONTROL.
PA_VDD is output from V11_V28TX through the T3V switch. On/off of the T3V switch is controlled by WRFON
pin, TXONFST pin, and r[PSCNTT3V]. Register command r[PSCNTT3V] can be controlled through the serial
interface; default is 0. Note: PA_VDD is output only when V11_V28TX has been turned on. More detail is given
in the SERIAL INTERFACE Section. On/off control of PA_VDD is shown in Table 4.
Table 4. PA_VDD ON/OFF Control
REG_EN(1)
VIO1V8(1)
WRFON
TXONFSTS
r[PSCNTT3V]
PA_VDD
1
ON
1
0
1
OFF
1
0
OFF
1
0
OFF
1
0
1
OFF
1
0
1
OFF
1
0
1
0
OFF
1
0
OFF
0
Don't Care
OFF
1
0
Don't Care
OFF
(1)
REG_EN and VIO1V8 sequence is described in SEQUENCE CONTROL.
V12_V28RX is an LDO that outputs 2.85 V, and is enabled during the power-up sequence of the TPS65040.
The SEQUENCE CONTROL Section gives more detail. Normal mode and low-power mode can be selected.
Normal mode provides high performance, and low-power mode provides low current consumption. Normal-mode
performance is much better than low-power mode. The output PMOS is stopped when the load current exceeds
the limit value of the current-limit protection in the normal mode, shutting down the power supply. When the load
current falls to less than the limit values, current limit is released. Current-limit protection is not available in
low-power mode. This LDO has low-current mode and high-current mode in normal mode. When in a light-load
condition, the mode is low-current mode. When in a heavy-load condition, the mode is high-current mode. The
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