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LM2767 Datasheet(PDF) 8 Page - Texas Instruments

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No. de pieza LM2767
Descripción Electrónicos  LM2767 Switched Capacitor Voltage Converter
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Fabricante Electrónico  TI [Texas Instruments]
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LM2767 Datasheet(HTML) 8 Page - Texas Instruments

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LM2767
V+
CAP+
OUT
GND
Oscillator
Switch Array
Switch
Drivers
CAP-
LM2767
SNVS069D – FEBRUARY 2000 – REVISED AUGUST 2015
www.ti.com
8 Detailed Description
8.1 Overview
The LM2767 CMOS charge-pump voltage converter operates as a voltage doubler for an input voltage in the
range of 1.8 V to 5.5 V. Two low-cost capacitors and a diode (needed during start-up) are used in this circuit.
8.2 Functional Block Diagram
8.3 Feature Description
The LM2767 contains four large CMOS switches which are switched in a sequence to double the input supply
voltage. Energy transfer and storage are provided by external capacitors. Figure 11 illustrates the voltage
conversion scheme. When S2 and S4 are closed, C1 charges to the supply voltage V+. During this time interval,
switches S1 and S3 are open. In the next time interval, S2 and S4 are open; at the same time, S1 and S3 are
closed, the sum of the input voltage V+ and the voltage across C1 gives the 2V+ output voltage when there is no
load. 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 are
discussed in Application and Implementation.
8.4 Device Functional Modes
The LM2767 is always enabled when power is applied to the V+ pin (1.8 V
≤ VIN ≤ 5.5 V). To disable the part,
power must be removed.
8
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