LM2661MM NSC [National Semiconductor], LM2661MM Datasheet
LM2661MM
Available stocks
Related parts for LM2661MM
LM2661MM Summary of contents
Page 1
LM2660/LM2661 Switched Capacitor Voltage Converter General Description The LM2660/LM2661 CMOS charge-pump voltage con- verter inverts a positive voltage in the range of 1.5V to 5.5V to the corresponding negative voltage. The LM2660/LM2661 uses two low cost capacitors to provide 100 ...
Page 2
Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V+ to GND, or GND to OUT) LV (OUT − 0.3V) to (GND + 3V) FC, OSC ...
Page 3
Test Circuits FIGURE 1. LM2660 and LM2661 Test Circuits Typical Performance Characteristics Supply Current vs Supply Voltage DS012911-7 Output Source Resistance vs Temperature DS012911-10 DS012911-5 (Circuit of Figure 1 ) Supply Current vs Oscillator Frequency DS012911-8 Efficiency vs Load Current ...
Page 4
Typical Performance Characteristics Efficiency vs Oscillator Frequency DS012911-13 Oscillator Frequency vs Supply Voltage (FC = V+) DS012911-16 Oscillator Frequency vs Temperature (FC = Open) DS012911-19 www.national.com (Circuit of Figure 1 ) (Continued) Output Voltage vs Oscillator Frequency DS012911-14 Oscillator Frequency ...
Page 5
... Connection Diagrams DS012911-1 Order Number LM2660M, LM2661M, LM2660MM or LM2661MM See NS Package Number M08A and MUA08A Ordering Information Order Number Package Number LM2660M M08A LM2660MX M08A LM2660MM MUA08A LM2660MMX MUA08A LM2661M M08A LM2661MX M08A LM2661MM MUA08A LM2661MMX MUA08A Note 9: The first letter “S” identifies the part as a switched capacitor converter. The next two numbers are the device number: “01” for a LM2660 device, and “02” ...
Page 6
Pin Description Pin Name Voltage Inverter 1 FC Frequency control for internal oscillator open kHz (typ); (LM2660) OSC kHz (typ); OSC FC has no effect when OSC pin is ...
Page 7
Application Information (Continued) The peak-to-peak output voltage ripple is determined by the oscillator frequency, and the capacitance and ESR of the output capacitor Again, using a low ESR capacitor will result in lower ripple. POSITIVE VOLTAGE DOUBLER ...
Page 8
Application Information size capacitor usually has a higher ESR compared with a bigger size capacitor of the same type. For lower ESR, use ceramic capacitors. FIGURE 3. Output Source Resistance vs Oscillator Frequency Manufacturer Phone Nichicon Corp. (708)-843-7500 AVX Corp. ...
Page 9
Other Applications (Continued) CASCADING DEVICES Cascading the LM2660s (or LM2661s easy way to produce a greater negative voltage (as shown in Figure the integer representing the number of devices cascaded, the unloaded output ...
Page 10
Other Applications (Continued) REGULATING V out It is possible to regulate the output of the LM2660/LM2661 by use of a low dropout regulator (such as LP2951). The whole con- verter is depicted in Figure 8 . This converter can give ...
Page 11
Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead SO (M) Order Number LM2660M or LM2661M NS Package Number M08A 11 www.national.com ...
Page 12
... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. 8-Lead Mini SO (MM) Order Number LM2660MM or LM2661MM NS Package Number MUA08A 2. A critical component is any component of a life ...