The ADM660/ADM8660 is a charge-pump voltage converter that can be used to either invert the input supply voltage giving V_OUT = -V_IN or double it (ADM660 only) giving V_OUT = 2 x V_IN. Input voltages ranging from +1.5 V to +7 V can be inverted into a negative -1.5 V to -7 V output supply. This inverting scheme is ideal for generating a negative rail in single power supply systems. Only two small external capacitors are needed for the charge pump. Output currents up to 50 mA with greater than 90% efficiency are achievable, while 100 mA achieves greater than 80% efficiency.

A Frequency Control (FC) input pin is used to select either 25 kHz or 120 kHz charge-pump operation. This is used to optimize capacitor size and quiescent current. With 25 kHz selected, a 10 µF external capacitor is suitable, while with 120 kHz the capacitor may be reduced to 2.2 µF. The oscillator frequency on the ADM660 can also be controlled with an external capacitor connected to the OSC input or by driving this input with an external clock. In applications where a higher supply voltage is desired it is possible to use the ADM660 to double the input voltage. With input voltages from 2.5 V to 7 V, output voltages from 5 V to 14 V are achievable with up to 100 mA output current.

The ADM8660 features a low power shutdown (SD) pin instead of the external oscillator (OSC) pin. This can be used to disable the device and reduce the quiescent current to 300 nA.

Part#	Input Voltage (V)	Vout Preset (V)	Iout	Power Efficiency (%)	Supply Current (max)	Shutdown Current, max	Boost	Buck	Inverter	Regulated Output	Package	Product Description	Price* (1000-4999)
ADM660	1.5 - 7	-Vin or 2*Vin	100mA	80	4.5mA	5µA	Y	---	Y	---	DIP/SO/TSSOP	CMOS Switched-Capacitor Voltage Inverter or Doubler	$1.80
ADM8660	1.5 - 7	-Vin	100mA	80	4.5mA	5µA	---	---	Y	---	DIP/SO/TSSOP	CMOS Switched-Capacitor Voltage Converter w/ Low Power Shutdown Pin	$1.90
ADM8828	1.5 - 5.5	-Vin	25mA	99	1mA	2µA	---	---	Y	---	6-Lead SOT 23	Switched Capacitor Voltage Inverter w/ Shutdown	$0.75
ADM8829	1.5 - 5.5	-Vin	25mA	99	1mA	n/a	---	---	Y	---	6-Lead SOT 23	Switched Capacitor Voltage Inverter	$0.75
ADM8832	2.6 - 3.6	+5.1/+15.3/-10.3	5mA	90	400µA	1µA	Y	---	Y	Y	LFCSP-20	Charge Pump Regulator for Color TFT Panel	$2.00
ADM8839	2.6 - 3.6	+5/+15/-15	8mA	82	500µA	5µA	Y	---	Y	Y	LFCSP-20	Charge Pump Regulator for Color TFT Panel (Higher Iout for the Three Vouts than the similar ADM8832	$1.90
ADP3605	3-6v	-3v/adj	120mA	n/a	6mA	15µA	---	Y	Y	Y	SOIC-8, TSSOP-14	120 mA Switched Capacitor Voltage Inverter with Regulated Output	$1.48

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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• Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).

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• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

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