Analog Devices Inc./Maxim Integrated DS1050U-001+T

Overview

DS1050U-001+T from Maxim Integrated (now Analog Devices) is a 5-bit programmable pulse-width modulator IC with fixed 1kHz output frequency, 2-wire serial interface, and 8-pin 118-mil SOP package. It delivers adjustable duty cycle from 0% to 100% across 2.7V–5.5V supply, consumes 50µA typical active current, and supports LCD contrast control, power supply voltage adjustment, and battery charging current regulation.

For engineers reviewing the DS1050U-001+T datasheet, DS1050U-001+T pinout, DS1050U-001+T application, or DS1050U-001+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, and real-world use cases for embedded power and analog control systems.

Technical Context

The DS1050U-001+T implements a dedicated 5-bit PWM generator with internal oscillator set to nominal 1kHz, supporting full 0–100% duty cycle via two command modes: standard 5-bit register (0–96.88% in 3.125% steps) and explicit 100% "full-on" command. Its 2-wire serial interface operates in both standard (100kHz) and fast (400kHz) modes, compatible with I²C-bus protocols and addressable up to eight devices using A0–A2 pins.

Internally, the device integrates shutdown control logic that reduces supply current to ≤1µA while placing PWMO in high-impedance state, and recall functionality that restores prior duty cycle configuration. The PWM output swings rail-to-rail (0V to VCC) with ±20% frequency tolerance and ±0.5 LSB absolute linearity over –40°C to +85°C.

Key Specifications

Pinout & Package

DS1050U-001+T is housed in an 8-pin 118-mil SOP package (JEDEC MS-012 variant), surface-mount compatible with standard reflow profiles and suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable PWM generator applications.

Compared with DS1050U-001+T, TLC59108IPWR offers greater channel count and resolution but adds complexity and cost for single-output use, while MCP4725-E/MS delivers superior DC accuracy but cannot replicate the DS1050U-001+T's integrated PWM timing, rail-to-rail switching, and ultra-low shutdown current.

Availability

DS1050U-001+T is available at Aetrix Electronics and suitable for LCD biasing, battery charging control, and DC-DC feedback applications requiring stable component supply, long-term lifecycle support, and industrial temperature compliance.

Supply support for DS1050U-001+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices (via acquisition of Maxim Integrated) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The DS1050U-001+T belongs to Maxim's legacy programmable timing and analog control product line, engineered specifically for low-cost, low-power PWM generation in resource-constrained embedded systems.

FAQ

What is the nominal output frequency of the DS1050U-001+T?

The DS1050U-001+T is factory-programmed for a nominal output frequency of 1kHz. This value is fixed per ordering code and cannot be altered. Measured frequency may vary within ±20% due to process, voltage, and temperature effects, as specified in the AC Electrical Characteristics table.

Does the DS1050U-001+T support 100% duty cycle output?

Yes, the DS1050U-001+T supports true 100% duty cycle via a dedicated "Set PWM Duty Cycle 100%" command. This complements the standard 5-bit register (0–96.88%) and ensures full-on operation without requiring external logic or workarounds in the DS1050U-001+T firmware interface.

What is the minimum supply voltage required for DS1050U-001+T operation?

The DS1050U-001+T operates down to 2.7V, as confirmed in the Recommended DC Operating Conditions table. Below this threshold, functionality-including PWM output stability and 2-wire communication-is not guaranteed, and the DS1050U-001+T may fail to initialize or respond to commands.

Can multiple DS1050U-001+T devices share the same I²C bus?

Yes, up to eight DS1050U-001+T units can operate on a single 2-wire bus by configuring unique combinations of A0, A1, and A2 pins (tied to VCC or GND). Each device responds only to its assigned 7-bit slave address (0101xxx), enabling coordinated PWM control without hardware arbitration.

What happens to the PWMO pin during DS1050U-001+T shutdown mode?

When the DS1050U-001+T enters shutdown mode via the "Set Shutdown Mode" command, the PWMO pin transitions to high-impedance (Hi-Z) state and draws ≤1µA supply current. The prior duty cycle setting is retained in register memory and restored automatically upon issuing the "Recall Mode" command.