Product Overview
LM2660M Charge Pump Inverter and Doubler, 1.5 V to 5.5 V Input, 100 mA, SOIC-8
Condition
Unused new old stock (NOS), surface-mount SOIC-8. Markings legible: National Semiconductor logo, LM26 60M. Sold each.
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Product Overview
National Semiconductor's LM2660M is a 100 mA switched-capacitor voltage converter in an 8-lead SOIC. It turns a positive input into a negative output or doubles it, and it can also divide a positive input in half, with no inductor in the circuit.
Key Features
- Modes: inverts or doubles the input; divides a positive input in half, up to 11 V in that mode
- Input range: 1.5 V to 5.5 V
- Output current: 100 mA max
- Output resistance: 6.5 ohm typical
- Efficiency: 88% typical at 100 mA
- Oscillator: selectable 10 kHz or 80 kHz; external clock up to 150 kHz
- Quiescent current: 0.12 mA typical with the FC pin open
- Operating temperature: -40 to 85 C
- Package: SOIC-8 surface mount
Applications
- Building a negative bias rail from a single 5 V or 3.3 V supply on a board that has no negative supply
- Doubling a low battery or logic rail for a circuit that needs more headroom
- Driving several converters from one external clock so their switching stays in step
- Replacing an LM2660M on an existing board at the original SOIC-8 footprint
Frequently Asked Questions
Can it make a negative supply from one positive rail?
Yes. In inverting mode it turns an input between 1.5 V and 5.5 V into a negative output, at up to 100 mA.
Is the LM2660M a different chip from the LM2660?
No. LM2660 names the device, and the M suffix is its 8-lead SOIC version.
A negative rail once meant a second winding on the transformer; this little SOIC gets there by shuffling charge between capacitors. Somewhere on a board that only has 5 V, an op amp is waiting to swing below ground.
