Features and Benefits
- Wide Operating Supply Voltage Range: 2V to 18V
- Boost Pin (Pin 1) for Higher Switching Frequency
- Simple Conversion of 15V to –15V Supply
- Low Output Resistance: 120Ω Maximum
- Power Shutdown to 8μA with SHDN Pin
- Open Circuit Voltage Conversion Efficiency: 99.9% Typical
- Power Conversion Efficiency: 93% Typical
- Easy to Use
The LTC1144 is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range of 2V to 18V, resulting in complementary output voltages of –2V to –18V. Only two noncritical external capacitors are needed for the charge pump and charge reservoir functions.
The converter has an internal oscillator that can be overdriven by an external clock or slowed down when connected to a capacitor. The oscillator runs at a 10kHz frequency when unloaded. A higher frequency outside the audio band can also be obtained if the Boost Pin is tied to V+. The SHDN pin reduces supply current to 8μA and can be used to save power when the converter is not in use.
The LTC1144 contains an internal oscillator, divide-by-two, voltage level shifter, and four power MOSFETs. A special logic circuit will prevent the power N-channel switch substrate from turning on.
- Conversion of 15V to ±15V Supplies
- Inexpensive Negative Supplies
- Data Acquisition Systems
- High Voltage Upgrade to LTC1044 or 7660
- Voltage Division and Multiplications
- Automotive Applications
- Battery Systems with Wall Adapter/Charger
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.