34CardBus Power Switches
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Design Considerations
ExpressCard Power Switches
The TPS2231 and TPS2236 ExpressCard power interface switches provide the total power management solution required by the ExpressCard specification. The TPS2231 and TPS2236 ExpressCard power interface switches distribute 3.3 V, AUX and 1.5 V to the ExpressCard socket. Each voltage rail is protected with integrated
TPS2211A
•Fully integrated VCC and VPP switching for
•Low rDS(on)
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•Compatible with
| TPS2211A |
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12 V | 12 V | AVCC |
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AVCC |
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0.1 ∝F |
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| VCC1 |
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| 0.1 ∝F | VCC2 PC Card |
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| Vpp1 Connector |
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| AVPP |
| Vpp2 |
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| 0.1 ∝F |
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5 V | 5 V |
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+ | 5 V |
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0.1 ∝F |
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3.3 V | 3.3 V | VCCD0 |
| VCC_EN0 |
+ | 3.3 V | VCCD1 |
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0.1 ∝F |
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| VPPD0 |
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| OC | To CPU | CS |
| GND | SHDN |
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Shutdown Signal From CPU
Typical PC card
PCMCIA/CardBus Power Switches
Standard PC cards require that VCC be switched between ground, 3.3 V and 5 V, while VPP is switched between ground, 3.3 V, 5 V and 12 V. CardBay sockets have the standard requirements for VCC, but require ground, 3.3 V and 5 V to VPP, and ground,
1.8V or 3.3 V to VCORE. Other PC card applications may simply not need 12 V or VPP while still having the standard requirements
for VCC. Therefore, consider the voltage requirements of the application when select-
ing a PCMCIA power switch.
Current-Limiting Power Switches
Power switches are used to intelligently turn power on and off, while providing fault protection. They are useful anywhere controlled allocation of power is needed to circuit blocks, modules,
To minimize voltage drop, select devices
with the lowest rDS(on) or Drain to Source
Power MUX ICs
Power MUX ICs are designed to transition from a main power supply to an auxiliary source when the main supply shuts down (e.g. switching from battery operation to a wall adapter).
Power Distribution Devices Family of Products
Current-Limiting Power Switch ICs
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| Fault Reporting |
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| TPS2048/581 |
| TPS2044/542 |
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| TPS2044A/54A | — | — | — |
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| TPS2095/6/7 |
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| TPS2044B/54B |
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| TPS2085/6/7 |
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| — | TPS2047B/57A | TPS2047/571 | — | TPS2043/532 | — | — | — | ||||||||
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| TPS2043A/53A |
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| TPS2043B/53B |
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| — | TPS2046B/56A | TPS2046/561 | — | TPS2042/522 | — | — | — | ||||||||
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| TPS2090/1/2 |
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| TPS2042A/52A |
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| TPS2042B/52B |
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| TPS2080/1/2 |
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| Single TPS2020/301 TPS2045A/55A | TPS2045/551 TPS2021/311 | TPS2041/512 | TPS2022/32 | TPS2023/33 | TPS2024/34 | ||||||||||||
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| TPS2041A/51A |
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| TPS2041B/51B |
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| Single | TPS2010A |
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1Nemko recognized. |
| 2UL and Nemko recognized. |
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PCMCIA/CardBus Power Switch Matrix ICs |
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| Current Limit (min) (A) |
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| 0.3 |
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| 3.3 V, 5 V, 12 V, VPP |
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| Dual |
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| TPS2224(A), TPS2226(A), TPS2204A, TPS2206A, TPS2205 | — | |||||||||
| Single |
| TPS2212 | — |
| TPS2204A, TPS2210A, TPS2211(A), TPS2220A, TPS2220B | TPS2231 | |||||||||||
| No 12 V |
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| TPS2223A |
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| TPS2044B/54B | — |
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Power MUX ICs |
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| IOUT |
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| Configuration |
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| (mA) | Transition | Comments | ||||||||||
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| TPS2100/1 |
| IN1: 500, IN2: 10 | Manual | ||||
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| TPS2102/3 |
| IN1: 500, IN2: 100 | Manual | ||||
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| TPS2104/5 |
| IN1: 500, IN2: 100 | Manual | ||||
| IN1 |
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| TPS2110A |
| Adj. 310 to 750 | Auto/Manual | TSSOP |
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| IN2 |
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| TPS2111A |
| Adj. 630 to 1250 | Auto/Manual | TSSOP |
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| TPS2112A |
| Adj. 310 to 750 | Auto |
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| TPS2113A |
| Adj. 630 to 1250 | Auto |
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| TPS2114A |
| Adj. 310 to 750 | Auto/Manual | TSSOP, Status pin | |||
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| TPS2115A |
| Adj. 630 to 1250 | Auto/Manual | TSSOP, Status pin | |||
| ExpressCard Power Switch ICs |
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| Device |
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| Ports |
| 3V rDS(on) (mΩ) | Interface | Current Limit (Min) (A) | |||||||
| TPS2231 |
| 1 |
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| 45 | Parallel | 2.5 | ||||||||||
| TPS2236 |
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| 45 | Parallel | 2.5 | ||||||||||
Interface Selection Guide | Texas Instruments 4Q 2006 |