TPS60240, TPS60241

TPS60242, TPS60243

SLVS372B – JUNE 2001 – REVISED JANUARY 2002

4

www.ti.com

detailed description

operating principle

The TPS6024x charge pump is a fixed-frequency, dual-phase charge pump that provides 25 mA of continuous

supply current for low-noise applications such as VCOs used in cell phones and wireless appliances.

Low-noise operation results from using a proprietary dual-phase charge pump topology that relies on an

voltage significantly compared to a standard single-phase charge pump. In addition, the linear feedback of the

shutdown

Driving EN low disables the converter. This disables the internal circuits and reduces input current to typically

0.1

µA. In this mode, the load is disconnected from the supply voltage. The device exits shutdown once EN is

set to a high level.

start-up procedure

The converter is enabled when EN is set from logic low to high. The start-up time to reach 90% of the nominal

output voltage is typically 0.5 ms at load currents lower than 10 mA and with an output capacitor of 1

µF.

–0.3 V to 6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Internally limited

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage EN

–0.3 V to 6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

125

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

– 65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shortcircuit output current

80 mA maximum

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† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

DGK

376 mW

3.76 mW/

°C

207 mW

150 mW

NOTE: The thermal resistance junction to ambient of the DGK package is RTH–JA = 150°C/W.