Analog Devices Inc./Maxim Integrated DS1052U-100

Overview

DS1052U-100 from Maxim Integrated (now part of Analog Devices) is a 5-bit programmable pulse-width modulator IC with fixed 100kHz output frequency, 2-wire serial interface, and 8-pin SOP (118-mil) package. It delivers adjustable duty cycle from 0% to 100% across 2.7V–5.5V supply, draws 100µA active current and 1µA shutdown current, and operates from –40°C to +85°C - ideal for LCD contrast control and low-power voltage adjustment.

For engineers reviewing the DS1052U-100 datasheet, DS1052U-100 pinout, DS1052U-100 application, or DS1052U-100 equivalent, key selection considerations include its 5-bit resolution (3.125% step size), I²C-compatible 2-wire slave interface with A0–A2 address pins, 100kHz nominal PWM frequency with ±20% tolerance, and space-saving 8-pin SOP footprint.

Technical Context

The DS1052U-100 implements a dedicated 5-bit PWM generator with internal oscillator set to 100kHz; it does not support frequency programming. Its 2-wire interface operates in both standard (100kHz) and fast (400kHz) modes, supporting up to eight devices on one bus via hardware-addressed A0–A2 pins.

Control logic accepts an 8-bit command byte followed by an 8-bit data byte: five LSBs configure duty cycle (00000B = 0%, 11111B = 96.88%), while three MSBs manage shutdown/recall. The PWMO output swings rail-to-rail (0V to VCC) and enters high-impedance state during shutdown.

Key Specifications

Pinout & Package

DS1052U-100 is housed in an 8-pin SOP package with 118-mil body width and standard SOIC footprint compatibility. Pin spacing is 0.050" (1.27mm), and lead pitch is 0.050".

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1052Z-100, DS1052U-100 offers identical functionality in a smaller SOP package for space-constrained designs; compared with TLC5925IPWPR, DS1052U-100 provides simpler 2-wire control, lower power, and direct analog substitution - but lacks multi-channel capability.

Availability

DS1052U-100 is available at Aetrix Electronics and suitable for LCD contrast control, DC-DC feedback adjustment, and battery charging current regulation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for DS1052U-100 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

Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The DS1052U-100 belongs to Maxim's programmable timing and interface product line, engineered specifically for low-cost, low-power analog control replacement in resource-constrained embedded systems.

FAQ

What is the exact PWM frequency tolerance of the DS1052U-100?

The DS1052U-100 has a nominal output frequency of 100kHz with a specified tolerance of ±20% over the full operating temperature range (–40°C to +85°C) and supply voltage (2.7V to 5.5V). This variation arises from process and voltage dependencies in the internal oscillator; actual measured frequency falls within 80kHz to 120kHz under worst-case conditions.

Does the DS1052U-100 support true 100% duty cycle, and how is it activated?

Yes, the DS1052U-100 supports true 100% duty cycle ("full-on") via a dedicated command sequence distinct from its standard 5-bit register write. Writing 0x00 to the PWM register yields 0%; writing 0x1F yields 96.88%; only the "Set PWM Duty Cycle 100%" command (control byte 0x50, data byte 0x40) forces PWMO to remain continuously high - essential for enabling power rails or bypassing regulation.

How many DS1052U-100 devices can share the same 2-wire bus?

Up to eight DS1052U-100 devices can operate on a single 2-wire bus, enabled by the A0, A1, and A2 address pins which configure a unique 3-bit slave address (0101xxx). Each device must have a distinct combination tied to VCC or GND; no external address decoder is needed, and all share the same SCL/SDA lines and pull-up resistors.

What is the maximum capacitive load the DS1052U-100 SDA and SCL pins can drive?

The DS1052U-100 SDA and SCL pins are open-drain outputs rated for standard and fast I²C modes, with a maximum bus capacitance of 400pF per line. This limit applies to total trace + device + connector capacitance; exceeding it risks timing violations (e.g., tR/tF degradation), especially at 400kHz. External pull-ups should be selected per I²C specification based on bus speed and load.

Can the DS1052U-100 operate from a 3.3V supply, and what is its typical active current at that voltage?

Yes, the DS1052U-100 fully supports 3.3V operation within its 2.7V–5.5V range. At 3.3V and +25°C, typical active supply current is 100µA - matching the value specified at 5.0V. This consistency across voltage makes DS1052U-100 suitable for mixed-voltage systems without performance trade-offs.