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LM2662 датащи(PDF) 10 Page - Texas Instruments

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номер детали LM2662
подробное описание детали  LM266x Switched Capacitor Voltage Converter
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FC(SD)
OSC
LM2662 (LM2663)
LV
V+
CAP+
OUT
GND
OSCILLATOR
Switch Array
Switch Drivers
CAP-
LM2662, LM2663
SNVS002E – JANUARY 1999 – REVISED OCTOBER 2014
www.ti.com
8 Detailed Description
8.1 Overview
The LM2662/LM2663 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 16 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 16. Voltage Inverting Principle
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Changing Oscillator Frequency
For the LM2662, the internal oscillator frequency can be selected using the Frequency Control (FC) pin. When
FC is open, the oscillator frequency is 20 kHz; when FC is connected to V+, the frequency increases to 150 kHz.
A higher oscillator frequency allows smaller capacitors to be used for equivalent output resistance and ripple, but
increases the typical supply current from 0.3 mA to 1.3 mA.
The oscillator frequency can be lowered by adding an external capacitor between OSC and GND (See typical
performance 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.
10
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Product Folder Links: LM2662 LM2663


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