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LM2664 データシート(PDF) 8 Page - Texas Instruments

部品番号 LM2664
部品情報  LM2664 Switched Capacitor Voltage Converter
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ホームページ  http://www.ti.com
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LM2664 データシート(HTML) 8 Page - Texas Instruments

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LM2664
SD
V+
CAP+
OUT
GND
OSCILLATOR
Switch Array
Switch Drivers
CAP-
LM2664
SNVS005E – NOVEMBER 1999 – REVISED DECEMBER 2014
www.ti.com
8 Detailed Description
8.1 Overview
The LM2664 CMOS charge-pump voltage converter inverts a positive voltage in the range of 1.8 V to 5.5 V to
the corresponding negative voltage of
−1.8 V to −5.5 V. The LM2664 uses two low-cost capacitors to provide up
to 40 mA of output current.
8.2 Functional Block Diagram
8.3 Feature Description
The LM2664 contains four large CMOS switches which are switched in a sequence to invert the input supply
voltage. Energy transfer and storage are provided by external capacitors. Figure 10 illustrates the voltage
conversion scheme. When S1 and S3 are closed, C1 charges to the supply voltage V+. During this time interval,
switches S2 and S4 are open. In the second time interval, S1 and S3 are open; at the same time, S2 and S4 are
closed, C1 is charging C2. After a number of cycles, the voltage across C2 will be pumped to V+. Since the anode
of C2 is connected to ground, the output at the cathode of C2 equals −(V+) when there is no load current. The
output voltage drop when a load is added is determined by the parasitic resistance (Rds(on) of the MOSFET
switches and the ESR of the capacitors) and the charge transfer loss between capacitors. Details will be
discussed in the following application information section.
Figure 10. Voltage Inverting Principle
8.4 Device Functional Modes
8.4.1 Shutdown Mode
A shutdown (SD) pin is available to disable the device and reduce the quiescent current to 1 µA. Applying a
voltage less than 20% of V+ to the SD pin will bring the device into shutdown mode. While in normal operating
mode, the pin is connected to V+.
8
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