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TPS60403QDBVRQ1 Datasheet(PDF) 3 Page - Texas Instruments

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Part # TPS60403QDBVRQ1
Description  UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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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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