DS1050U-025+

Overview

The DS1050U-025+ is a 5-bit programmable pulse-width modulator (PWM) from Analog Devices/Maxim Integrated, housed in an 8-pin µSOP package. It operates on a single supply voltage ranging from 2.7V to 5.5V and provides a standard output frequency of 25kHz. The device features a 2-wire addressable serial interface for communication. Key electrical parameters include a typical active supply current of 50µA and a standby current of less than 1µA. The PWM output duty cycle is adjustable from 0% to 96.88% with 3.125% steps, or can be set to 100%. It supports both standard (100kHz) and fast mode (400kHz) clock rates.

Feature Summary

• Single 5-bit programmable PWM with adjustable duty cycle from 0% to 100%
• Standard 25kHz output frequency option
• 2-Wire addressable serial interface supporting up to eight devices
• Low power consumption: 50µA active, <1µA shutdown

Applications

• LCD contrast and brightness control
• Power supply voltage adjustment
• Battery charging or current adjustment

Procurement Notes

Verify the specific suffix 'U' indicates the 8-pin 118-mil µSOP package variant rather than the SOIC version. Confirm RoHS compliance status through official manufacturer documentation prior to ordering. Ensure the master controller supports the required 2-wire protocol timing for standard or fast mode operation.

Selection Notes

Select this model for applications requiring a fixed 25kHz PWM frequency. Choose the U suffix for space-constrained designs needing the µSOP package. Verify that the system bus speed matches the device's support for 100kHz or 400kHz SCL frequencies. Consider the ±20% output frequency tolerance when precise timing is critical.

Part Context

The DS1050U-025+ belongs to the DS1050 series of programmable PWMs. It shares functional similarities with other models in the family but differs in package type (µSOP vs. SOIC) and specific output frequency rating (25kHz vs. 1kHz, 5kHz, or 10kHz). It is compatible with other Dallas Semiconductor 2-wire devices such as RTCs and digital thermometers.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-reference with DS1050Z-025+ only if the SOIC package is acceptable instead of the µSOP package.