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LTC1144CN8#PBF

ADILTC1144CN8#PBF

Analog Devices Inc.
Charge Pump Switching Regulator IC Positive or Negative Fixed -Vin, 2Vin, Vin/2 1 Output 50mA 8-DIP (0.300", 7.62mm)
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Overview

The LTC1144CN8#PBF is a CMOS switched-capacitor voltage converter that performs supply voltage conversion from a positive input to a negative output. It operates over a wide input range of 2V to 18V and is capable of providing up to 50mA of output current. The device is housed in a user-friendly 8-pin PDIP package, making it ideal for through-hole prototyping and manual assembly.

Why Choose This Part

The LTC1144 provides a simple solution for voltage inversion without the need for inductors, reducing EMI and board complexity. It features a wide 18V maximum input, which is higher than standard 7660-type converters, and includes a shutdown pin to reduce power consumption when the converter is not needed.

Applications

Negative Bias Generation
Creating a negative supply rail from a single positive input for operational amplifier biasing.
Voltage Doubling
Configuring the charge pump to provide a 2Vin output for low-current boost requirements.
Battery Powered Systems
Extending battery life in portable instruments through high-efficiency voltage inversion with low supply current.
RS232 Power Supplies
Generating the necessary bipolar rails for serial communication interfaces from a single 5V or 12V logic supply.

Key Specifications

Function Ratiometric
Topology Charge Pump
Output Type Fixed
Mounting Type Through Hole
Package / Case 8-DIP (0.300", 7.62mm)
Current - Output 50mA
Number of Outputs 1
Output Configuration Positive or Negative
Frequency - Switching 4kHz ~ 10kHz
Operating Temperature 0degC ~ 70degC (TA)
Synchronous Rectifier No
Voltage - Input (Max) 18V
Voltage - Input (Min) 2V
Supplier Device Package 8-PDIP
Voltage - Output (Min/Fixed) -Vin, 2Vin, Vin/2

Getting Started

To use this part, connect a 10uF electrolytic or tantalum capacitor between the CAP+ and CAP- pins, and another 10uF capacitor from the VOUT pin to ground. Ensure the input voltage does not exceed 18V, and remember that as a switched-capacitor device, the output voltage will drop slightly as the 50mA load limit is approached due to the internal output resistance.

Also Consider

MAX660CPA+ Maxim Integrated - Provides significantly higher output current (up to 100mA) in the same 8-pin DIP footprint.