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LM2664 数据表(PDF) 11 Page - Texas Instruments

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部件名 LM2664
功能描述  LM2664 Switched Capacitor Voltage Converter
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM2664 数据表(HTML) 11 Page - Texas Instruments

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LM2664
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SNVS005E – NOVEMBER 1999 – REVISED DECEMBER 2014
Figure 13. Increasing Output Voltage by Cascading Devices
9.2.2.3 Combined Doubler and Inverter
In Figure 14, the LM2664 is used to provide a positive voltage doubler and a negative voltage converter. Note
that the total current drawn from the two outputs should not exceed 50 mA.
Figure 14. Combined Voltage Doubler and Inverter
9.2.2.4 Regulating VOUT
It is possible to regulate the negative output of the LM2664 by use of a low dropout regulator (such as LP2980).
The whole converter is depicted in Figure 15. This converter can give a regulated output from
−1.8 V to −5.5 V
by choosing the proper resistor ratio:
VOUT = Vref (1 + R1/R2)
(5)
where, Vref = 1.23 V
(6)
Note that the following conditions must be satisfied simultaneously for worst case design:
Vin_min > Vout_min + Vdrop_max (LP2980)
(7)
+ Iout_max × Rout_max (LM2664)
(8)
Vin_max < Vout_max + Vdrop_min (LP2980)
(9)
+ Iout_min × Rout_min (LM2664)
(10)
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Copyright © 1999–2014, Texas Instruments Incorporated
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