MIC2660 Datasheet, PDF (1/8 Pages) Micrel Semiconductor – IttyBitty Charge Pump

MIC2660
Micrel
MIC2660
IttyBitty™ Charge Pump
Not Recommended for New Designs
General Description
The MIC2660 IttyBitty™ charge pump functions as a low-
current, step-up converter where conventional inductor based,
dc-to-dc converters are too complex and expensive. This
device features a complete, self-contained charge pump in a
tiny 5-lead SOT-23-5 package.
The MIC2660 is powered from a 3V to 5V nominal supply and
produces nominally 5V to 9V as a function of the input
voltage. The output is unregulated and follows a load-line
type function.
The MIC2660 can be used with or without external compo-
nents. When used with two noncritical external capacitors, a
3V input will produce 5V at 3.8mA. With no external compo-
nents, a 3V input will produce 5V at 2.5mA.
The MIC2660 charge pump consists of an approximately
18MHz oscillator and a voltage tripler.
The MIC2660 is available in the SOT-23-5 package and
is rated for –40°C to +85°C ambient temperature range.
Features
• 3V input produces approx. 5V unregulated output*
3.8mA with 1µF external output capacitor
2.5mA without external capacitor
• 5V input produces approx. 9V unregulated output*
4.5mA output without external capacitor
• CMOS-logic compatible enable
• ESD protected
Applications
• Squib firing
• Refresh
• Burst/dump
• Low duty cycle load
• LCD bias generator
• Local 5V logic supply
• MOSFET driver
• Battery or solarcell boost
Ordering Information
Part Number
MIC2660BM5
Temperature Range
–40°C to +85°C
Package
SOT-23-5
Typical Application
Timing Diagram
+3V Input
0.01µF
MIC2660
1
IN
3
OUT
5
EN
2
GND
Enable
Disable
+5V, 2.5mA*
Output
0.01µF
* The output is unregulated and
follows a load-line type function
Low-Current Unregulated Step-Up Supply
2V
EN
0V
5V
OUT
1V
0V
0.2
1.3
µs
µs
Output vs. Enable Input
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
August 1999
1
MIC2660