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LM2660-MWC 数据表(PDF) 9 Page - Texas Instruments

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部件名 LM2660-MWC
功能描述  Switched Capacitor Voltage Converter
Download  27 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2660-MWC 数据表(HTML) 9 Page - Texas Instruments

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FC
OSC
LM2660
LV
V+
CAP+
OUT
GND
OSCILLATOR
Switch Array
Switch Drivers
CAP-
LM2660
www.ti.com
SNVS135E – SEPTEMBER 1999 – REVISED DECEMBER 2014
8 Detailed Description
8.1 Overview
The LM2660 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 13 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 and 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+) assuming no load on C2, no loss in the
switches, and no ESR in the capacitors. In reality, the charge transfer efficiency depends on the switching
frequency, the on-resistance of the switches, and the ESR of the capacitors.
Figure 13. Voltage Inverting Principle
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Changing Oscillator Frequency
The internal oscillator frequency can be selected using the Frequency Control (FC) pin. When FC is open, the
oscillator frequency is 10 kHz; when FC is connected to V+, the frequency increases to 80 kHz. A higher
oscillator frequency allows smaller capacitors to be used for equivalent output resistance and ripple, but
increases the typical supply current from 0.12 mA to 1 mA.
The oscillator frequency can be lowered by adding an external capacitor between OSC and GND. (See Typical
Characteristics.) Also, in the inverter mode, an external clock that swings within 100 mV of V+ and GND can be
used to drive OSC. Any CMOS logic gate is suitable for driving OSC. LV must be grounded when driving OSC.
The maximum external clock frequency is limited to 150 kHz.
The switching frequency of the converter (also called the charge pump frequency) is half of the oscillator
frequency.
NOTE
OSC cannot be driven by an external clock in the voltage-doubling mode.
Copyright © 1999–2014, Texas Instruments Incorporated
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