Analog Devices Inc./Maxim Integrated DS1050U-005+

Overview

DS1050U-005+ from Maxim Integrated (now Analog Devices) is a 5-bit programmable pulse-width modulator IC with fixed 5kHz output frequency, 2-wire serial interface, and 8-pin 118-mil SOP package. It delivers adjustable duty cycle (0%–100%), operates from 2.7V to 5.5V, and draws only 50µA typical active current-ideal for LCD contrast control and battery charging regulation.

For engineers reviewing the DS1050U-005+ datasheet, DS1050U-005+ pinout, DS1050U-005+ application, or DS1050U-005+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world use cases, and two rigorously cross-checked alternative parts for design flexibility.

Technical Context

The DS1050U-005+ implements a dedicated 5-bit PWM generator with internal oscillator locked to 5kHz nominal frequency, ±20% tolerance over temperature and voltage. Its 2-wire serial interface supports both Standard Mode (100kHz) and Fast Mode (400kHz) I²C-compatible timing, enabling multi-device bus operation with hardware address pins A0–A2.

It features dual-mode PWM control: standard 5-bit resolution (0%–96.88% in 3.125% steps) plus a dedicated "full-on" command for true 100% duty cycle. Shutdown mode reduces supply current to ≤1µA while placing PWMO in high-impedance state-critical for low-power embedded systems.

Key Specifications

Pinout & Package

DS1050U-005+ uses an 8-pin 118-mil SOP package (JEDEC MSOP-8 variant), surface-mount compatible with standard reflow profiles and 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-005+, MAX16820AUB+T trades programmability for integration and speed, while PCA9685PW,118 offers scalability at the cost of power efficiency and simplicity-making DS1050U-005+ optimal for single-output, low-power, fixed-frequency analog control tasks.

Availability

DS1050U-005+ is available at Aetrix Electronics and suitable for LCD biasing, battery charging regulation, and microcontroller peripheral offload applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for DS1050U-005+ 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 (formerly Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and consumer markets.

The DS1050U-005+ belongs to Maxim's legacy programmable timing IC portfolio, designed specifically for low-cost, low-power analog control replacement in embedded systems where MCU resources are constrained.

FAQ

What is the exact output frequency tolerance of the DS1050U-005+?

The DS1050U-005+ has a nominal output frequency of 5kHz with a specified tolerance of ±20% across operating temperature (−40°C to +85°C) and supply voltage (2.7V to 5.5V). This tolerance reflects process variation and environmental effects-not drift over time. The DS1050U-005+ does not include trimming or calibration circuitry, so system-level filtering or feedback may be needed for tight frequency-critical applications.

Does the DS1050U-005+ support true 100% duty cycle output?

Yes, the DS1050U-005+ supports true 100% duty cycle via a dedicated "Set PWM Duty Cycle 100%" command (0x50 control byte with data byte 0x40). This is distinct from its 5-bit register (0x00–0x1F), which yields 0%–96.88%. The full-on command places PWMO in continuous HIGH state-essential for applications like enabling power rails or bypassing regulators without external logic.

Can multiple DS1050U-005+ devices share the same I²C bus?

Yes, up to eight DS1050U-005+ devices can operate on a single 2-wire bus using hardware address pins A0, A1, and A2. Each pin is binary-configured (VCC or GND) to set a unique 3-bit slave address. The DS1050U-005+ responds only to its assigned address, enabling coordinated PWM control across multiple subsystems without bus contention or software arbitration.

What is the maximum capacitive load the DS1050U-005+ PWMO pin can drive?

The DS1050U-005+ PWMO pin is rated for 3mA source and 2mA sink current. Based on its output impedance (~200Ω) and rise/fall time specs, it reliably drives ≤100pF capacitive loads (e.g., short PCB traces + small RC filters). For larger loads (e.g., >1nF), an external buffer or op-amp stage is required to maintain clean edges and avoid duty-cycle distortion in the DS1050U-005+ output waveform.

How does the DS1050U-005+ behave during power-up?

The DS1050U-005+ powers up to half-scale (binary 10000 = 16 decimal), delivering a default 50% duty cycle at 5kHz-enabling immediate functional operation without host initialization. This "standalone oscillator" mode allows basic analog control before I²C communication is established. Configuration changes (duty cycle, shutdown) require explicit I²C commands after power stabilization.