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TPS60403QDBVRQ1 Datasheet(PDF) 3 Page - Texas Instruments |
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TPS60403QDBVRQ1 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 29 page TPS60400Q1, TPS60401Q1, TPS60402Q1, TPS60403Q1 UNREGULATED 60mA CHARGE PUMP VOLTAGE INVERTER SGLS246A − JUNE 2004 − REVISED JUNE 2008 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION CFLY+ 5 Positive terminal of the flying capacitor C(fly) CFLY− 3 Negative terminal of the flying capacitor C(fly) GND 4 Ground IN 2 I Supply input. Connect to an input supply in the 1.6-V to 5.5-V range. Bypass IN to GND with a capacitor that has the same value as the flying capacitor. OUT 1 O Power output with VO = −VI Bypass OUT to GND with the output filter capacitor CO. detailed description operating principle The TPS60400, TPS60401 charge pumps invert the voltage applied to their input. For the highest performance, use low equivalent series resistance (ESR) capacitors (e.g., ceramic). During the first half-cycle, switches S2 and S4 open, switches S1 and S3 close, and capacitor (C(fly)) charges to the voltage at VI. During the second half-cycle, S1 and S3 open, S2 and S4 close. This connects the positive terminal of C(fly) to GND and the negative to VO. By connecting C(fly) in parallel, CO is charged negative. The actual voltage at the output is more positive than −VI, since switches S1–S4 have resistance and the load drains charge from CO. C(fly) 1 µF S2 S1 S3 S4 CO 1 µF VO (−VI) GND VI GND Figure 1. Operating Principle charge-pump output resistance The TPS6040x devices are not voltage regulators. The charge pumps output source resistance is approximately 15 Ω at room temperature (with VI = 5 V), and VO approaches –5 V when lightly loaded. VO will droop toward GND as load current increases. VO = −(VI – RO × IO) R O [ 1 ƒosc C (fly) ) 4 2R SWITCH ) ESR CFLY ) ESR CO RO = output resistance of the converter (1) |
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