TPS2061DBVRG4 datasheet(24/55 Pages) TI2

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BPHs obtain all power from upstream ports and often contain an embedded function. The hubs are required

to power up with less than one unit load. The BPH usually has one embedded function, and power is always

available to the controller of the hub. If the embedded function and hub require more than 100 mA on power

up, the power to the embedded function may need to be kept off until enumeration is completed. This can be

accomplished by removing power or by shutting off the clock to the embedded function. Power switching the

embedded function is not necessary if the aggregate power draw for the function and controller is less than one

unit load. The total current drawn by the bus-powered device is the sum of the current to the controller, the

embedded function, and the downstream ports, and it is limited to 500 mA from an upstream port.

9.1.8 Low-power Bus-powered and High-Power Bus-Powered Functions

Both low-power and high-power bus-powered functions obtain all power from upstream ports; low-power

functions always draw less than 100 mA; high-power functions must draw less than 100 mA at power up and can

draw up to 500 mA after enumeration. If the load of the function is more than the parallel combination of 44 Ω

and 10 μF at power up, the device must implement inrush current limiting (see Figure 9-4). With TPS206x, the

internal functions can draw more than 500 mA, which fits the needs of some applications such as motor driving

circuits.

OC1

OC2

0.1 µF

10 µF

Internal

Function

OUT1

Power Supply

3.3 V

EN1

0.1 µF

10 µF

OUT2

Internal

Function

0.1 µF

10 µF

USB

Control

GND

VBUS

D−

D+

TPS2062

EN2

GND

Figure 9-4. High-Power Bus-Powered Function

9.1.9 USB Power-distribution Requirements

USB can be implemented in several ways, and, regardless of the type of USB device being developed, several

power-distribution features must be implemented.

• Hosts/SPHs must:

– Current-limit downstream ports

– Report overcurrent conditions on USB VBUS

• BPHs must:

– Enable/disable power to downstream ports

– Power up at <100 mA

– Limit inrush current (<44 Ω and 10 μF)

• Functions must:

– Limit inrush currents

– Power up at <100 mA

The feature set of the TPS206x allows them to meet each of these requirements. The integrated current-limiting

and overcurrent reporting is required by hosts and self-powered hubs. The logic-level enable and controlled

rise times meet the need of both input and output ports on bus-powered hubs, as well as the input ports for

bus-powered functions (see Figure 9-5).

TPS2061, TPS2062, TPS2063

TPS2065, TPS2066, TPS2067

SLVS490K – DECEMBER 2003 – REVISED JUNE 2024

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