TPS22981

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Thunderbolt™ 主机/外设电源多路复用器（针对 Thunderbolt 2 进行了优化）

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数据表

document-pdfAcrobat TPS22981 3.3-V to 18-V Thunderbolt™ Power Mux 数据表 (Rev. B) (英语) PDF | HTML

TPS22981

正在供货

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产品详情

Number of input channels

2

IN1, IN2 input voltage (max) (V)

3.6, 19.8

IN1, IN2 input voltage (min) (V)

3, 4.5

IN1 output current (max) (A)

3.1

IN2 output current (max) (A)

3.1

Quiescent current (Iq) (µA)

500

Imax (A)

0.5

Rating

Catalog

Features

Adjustable current limit, Inrush current control, Reverse Current Protection, Reverse current blocking, Short circuit protection, Thermal shutdown, Under voltage lock out

IN1 rDS(on) (typ) (mΩ)

250

IN2 rDS(on) (typ) (mΩ)

125

Operating temperature range (°C)

-40 to 85

FET

Internal

Device type

Power muxes

Function

Adjustable current limit, Reverse current blocking, Thermal shutdown

Number of input channels

2

IN1, IN2 input voltage (max) (V)

3.6, 19.8

IN1, IN2 input voltage (min) (V)

3, 4.5

IN1 output current (max) (A)

3.1

IN2 output current (max) (A)

3.1

Quiescent current (Iq) (µA)

500

Imax (A)

0.5

Rating

Catalog

Features

Adjustable current limit, Inrush current control, Reverse Current Protection, Reverse current blocking, Short circuit protection, Thermal shutdown, Under voltage lock out

IN1 rDS(on) (typ) (mΩ)

250

IN2 rDS(on) (typ) (mΩ)

125

Operating temperature range (°C)

-40 to 85

FET

Internal

Device type

Power muxes

Function

Adjustable current limit, Reverse current blocking, Thermal shutdown

VQFN (RGP)

20

16 mm² (4 mm × 4 mm)

Powered from 3.3 V
4.5-V to 19.8-V High-Voltage Switch
3-V to 3.6-V Switch
Adjustable Current Limit
Thermal Shutdown
Make Before Break Switch
High-Voltage Discharge Before Low-Voltage Make
Reverse Current Blocking

Powered from 3.3 V
4.5-V to 19.8-V High-Voltage Switch
3-V to 3.6-V Switch
Adjustable Current Limit
Thermal Shutdown
Make Before Break Switch
High-Voltage Discharge Before Low-Voltage Make
Reverse Current Blocking

The TPS22981 device is a current-limited power mux providing a connection to a peripheral device from either a low-voltage supply (3 V to 3.6 V) or a high-voltage supply (4.5 V to 19.8 V). The desired output is selected by digital control signals.

The high-voltage (VHV) and low-voltage (V3P3) switch current limits are set with external resistance. Once the current limit is reached, the TPS22981 will control the switch to maintain the current at this limit.

When the high-voltage supply is not present, the TPS22981 will maintain the connection to the output from the low-voltage supply. Upon the presence of a high-voltage line and high-voltage enable signal, the high-voltage switch is turned on in conjunction with the low-voltage switch until a reverse current is detected through the low-voltage switch, allowing a seamless transition from low voltage to the high-voltage supply with minimal droop and shoot-through current.

To prevent current backflow during a switch over from a VHV connection to a V3P3 connection, the TPS22981 will break the VHV connection, discharge the output to approximately 3.3 V and then make the V3P3 connection. The output may transition to 0 V when a load is present, before returning to 3.3 V.

The TPS22981 is available in a 4 mm × 4 mm × 1 mm VQFN package.

The TPS22981 device is a current-limited power mux providing a connection to a peripheral device from either a low-voltage supply (3 V to 3.6 V) or a high-voltage supply (4.5 V to 19.8 V). The desired output is selected by digital control signals.

The high-voltage (VHV) and low-voltage (V3P3) switch current limits are set with external resistance. Once the current limit is reached, the TPS22981 will control the switch to maintain the current at this limit.

When the high-voltage supply is not present, the TPS22981 will maintain the connection to the output from the low-voltage supply. Upon the presence of a high-voltage line and high-voltage enable signal, the high-voltage switch is turned on in conjunction with the low-voltage switch until a reverse current is detected through the low-voltage switch, allowing a seamless transition from low voltage to the high-voltage supply with minimal droop and shoot-through current.

To prevent current backflow during a switch over from a VHV connection to a V3P3 connection, the TPS22981 will break the VHV connection, discharge the output to approximately 3.3 V and then make the V3P3 connection. The output may transition to 0 V when a load is present, before returning to 3.3 V.

The TPS22981 is available in a 4 mm × 4 mm × 1 mm VQFN package.

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