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參數(shù)資料
| 型號： | TPS9125PW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 5 V/3 V SIM SUPPLY AND LEVEL SHIFTERS |
| 中文描述： | 5伏/ 3伏SIM卡供應(yīng)及電平轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 338K |
| 代理商： | TPS9125PW |
TPS9125
5 V/3 V SIMSUPPLY AND LEVEL SHIFTERS
SLVS244A – SEPTEMBER 1999 – REVISED NOVEMBER 1999
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
4.5
4.3
4.2
4
0
0.5
1
1.5
2
2.5
3
V
4.7
4.8
SIM Clock Frequency – MHz
4.9
3.5
4
4.5
5
4.6
4.4
4.1
VDD = 3.3 V
VDD = 2.8 V
VDD = 2.7 V
VOLTAGE OUTPUT
vs
SIM CLOCK FREQUENCY
Figure 14. Voltage At SIMV
CC
vs Frequency at SIMCLK Terminal in 5-V Mode
Figure 14 shows the output voltage on SIMVCC in 5-V mode versus the frequency of the clock signal on
CLK/SIMCLK dependent on the input voltage V
DD
. The load on the charge pump is the sum of the maximum
dc load on SIMVCC (10 mA) and the ac load of 100 pF on SIMCLK buffer.
In 3 V mode, the charge pump and oscillator are disabled all the time, thus reducing power dissipation to a
minimum. Switches T1 and T2 in Figure 14 directly connect the supply voltage on VDD to SIMVCC; the voltage
on SIMVCC is therefore equal to the supply voltage V
DD
minus the conduction losses across the switches.
dimensioning of the capacitors
output capacitor C2
The value of output capacitor C2 depends on the maximum charge pump load current, the allowed ripple on
SIMVCC, and the charge pump operating frequency.
In 5-V mode, the charge pump also supplies the drivers of the 5-V level shifters. The maximum load current the
charge pump has to provide is therefore the sum of the dc output current at SIMVCC and the ac supply current
for the level shifters; the SIMCLK driver is the major contributor to this ac load:
ILOADmax
ISIMVCCmax
IACmax
10 mA
6 mA
16 mA
The minimum, theoretical required value for C2 can be calculated using the equation below:
C2min
ILOADmax
Vripple
ILOADmax
Vripple
2
OSC
16 mA
2
100 mV
440 kHz
185 nF
As described above, the regulated charge pump is disabled during the time in which the voltage across the
output capacitor C2 is above the lower threshold voltage, and therefore high enough to ensure the specified
minimum voltage on SIMVCC.
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