TPS2500 datasheet(17/43 Pages) TI2

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R(ILIM) − Current-Limiting Resistance − kΩ

200

400

600

800

1000

1200

1400

1600

1800

100

G009

IOS(min)

I(AUX) = 0 A

VIN = 3.3 V

IOS(max)

IOS(typ)

I(AUX) − Auxiliary Current − mA

1250

1275

1300

1325

1350

1375

1400

1425

1450

100

200

300

400

500

G010

VIN = 3.3 V

VIN = 4.75 V

VIN = 5.2 V

RL = 20 kΩ

TJ = 25°C

I(AUX) − Auxiliary Current − mA

625

650

675

700

725

750

775

100

200

300

400

500

G011

RL = 40 kΩ

TJ = 25°C

VIN = 4.75 V

VIN = 2.4 V

VIN = 3.3 V

VIN = 5.2 V

TPS2500, TPS2501

www.ti.com

SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010

Figure 13. USB Current-Limit Threshold vs RILIM Over Temperature and Process, VIN = 3.3 V, IAUX = 0 A

In addition to current-limit shifts due to process and temperature, the operating conditions of the boost converter

also affect the current-limit threshold of the USB switch. Figure 13 accounts for process and temperature shifts at

VIN = 3.3 V and IAUX = 0 A. The following figures show current-limit shift trends over VIN and IAUX (where IAUX is

the auxiliary 5-V load current provided to any non-USB loads). These curves can be used to calculate the USB

current-limit threshold shift for a given application where the input voltage VIN range and auxiliary current IAUX

vary.

Figure 14. USB Current-Limit Threshold vs IAUX,

Figure 15. USB Current-Limit Threshold vs IAUX,

RILIM = 20 kΩ, TA = 25 °C

RILIM = 40 kΩ, TA = 25 °C

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