VIN − Input Voltage − V

500

750

1000

1250

1500

1750

2000

2250

2500

1.75

2.25

2.75

3.25

3.75

4.25

4.75

5.25

G002

Typical

Conservative

250 kHz

1 MHz

TPS2500, TPS2501

SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010

www.ti.com

typical plot assumes nominal conditions—2.2 mH inductor, 1-MHz/250-kHz switching frequency, nominal

MOSFET on-resistances. The conservative plot assumes more pessimistic conditions—1.7 mH inductor,

925-kHz/230-kHz switching frequency, and maximum MOSFET on-resistances. The graph accounts for the

frequency change from 1-MHz to 250-kHz when VIN > VLFM (4.35 V typical) and for the no-frequency mode when

VIN > VNFM (5.05 V typical), which explains the discontinuities of the graph.

Table 2. Maximum Total DC/DC Current (IAUX + IUSB) at Common Input Voltages

Maximum Total Output Current (IAUX + IUSB)

Input Voltage (V)

Conservative (mA)

Typical (mA)

1.8

599

757

2.5

916

1113

2.7

1008

1216

3

1148

1374

3.3

1308

1536

3.6

1445

1704

4.35

1241

1730

4.5

1364

1858

4.75

1593

2093

5.05

2300

2300

5.25

2300

2300

SPACE ADDED

SPACE ADDED

SPACE ADDED

MAXIMUM TOTAL (AUXILIARY + USB) CURRENT

vs

INPUT VOLTAGE

Figure 12. Maximum Total DC/DC Current vs. Input Voltage

14

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