Features: *Converts V+ to V- or V+ to 2V+
*Low output resistance, 10 max.
*High power efficiency
*Selectable charge pump frequency of 25kHz or 135kHz; optimize capacitor size.
*Low quiescent curren
*Pin-compatible to MAX660, LTC660 with higher frequency operation
*Available in 8-pin SOIC, DIP and 0.8mm thin 4x4mm TDFN packages
*Lead-free, halogen-free package optionSpecificationsV+ to GND .......................................................................... 6V
Input Voltage (Pins 1, 6 and 7) ............... -0.3V to (V+ + 0.3V)
BOOST/FC and OSC Input Voltage ........................... The least
negative of (Out - 0.3V) or (V+ - 6V) to (V+ + 0.3V)
Output Short-circuit Duration to GND ............................ 1 sec.
(OUT may be shorted to GND for 1 sec without damage but
shorting OUT to V+ should be avoided.)
Continuous Power Dissipation (TA = 70°C)
Plastic DIP ..................................................................730mW
SO ..............................................................................500mW
TDFN .................................................................................1W
Storage Temperature ................................. -65°C to 160°C
Lead Soldering Temperature (10 sec) ........................ 300°C
ESD Rating-Human Body Model ..................... ..............2000V
Description
The CAT661 is a charge-pump voltage converter. It can invert a positive input voltage to a negative output. Only two external capacitors are needed. With a guaranteed 100mA output current capability, the CAT661 can replace a switching regulator and its inductor. Lower EMI is achieved due to the absence of an inductor.
In addition, the CAT661 can double a voltage supplied from a battery or power supply. Inputs from 2.5V to 5.5V will yield a doubled, 5V to 11V output.
A Frequency Control pin (BOOST/FC)CAT661 is provided to select either a high (typically 135kHz) or low (25kHz) internal oscillator frequency, thus allowing quiescent current vs. capacitor size trade-offs to be made. The 135kHz frequency is selected when the FC pin is connected to V+. The operating frequency can also be adjusted with an external capacitor at the OSC pin or by driving OSC with an external clock.
Both 8-pin DIP and SO packages are available.
The CAT661 can replace the MAX660 and the LTC660 in applications where higher oscillator frequency and smaller capacitors are needed. In addition, the CAT661 is pin compatible with the 7660/1044, offering an easy upgrade for applications with 100mA loads.
The CAT661 is a charge-pump voltage converter. It can invert a positive input voltage to a negative output. Only two external capacitors are needed. With a guaranteed 100mA output current capability, the CAT661 can replace a switching regulator and its inductor. Lower EMI is achieved due to the absence of an inductor.
In addition, the CAT661 can double a voltage supplied from a battery or power supply. Inputs from 2.5V to 5.5V will yield a doubled, 5V to 11V output.
A Frequency Control pin (BOOST/FC) is provided to select either a high (typically 135kHz) or low (25kHz) internal oscillator frequency, thus allowing quiescent current vs. capacitor size trade-offs to be made. The 135kHz frequency is selected when the FC pin is connected to V+. The operating frequency can also be adjusted with an external capacitor at the OSC pin or by
driving OSC with an external clock.
Both 8-pin DIP and SO packages are available. The TDFN package 4x4mm footprint features a 0.8mm maximum height. For die availability, contact Catalyst Semiconductor marketing.
The CAT661 can replace the MAX660 and the LTC660 in applications where higher oscillator frequency and smaller capacitors are needed. In addition, the CAT661 is pin compatible with the 7660/1044, offering an easy upgrade for applications with 100mA loads.
CAT661 Data Sheet
