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 PWM duty cycle from 0% to 100% across 2.7V–5.5V supply, consumes only 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, this device serves as a space-efficient, I²C-compatible PWM generator for embedded power management, display biasing, and battery charge control where precise 5-bit resolution and ultra-low standby current are required.

Technical Context

The DS1052U-100+ implements a dedicated on-chip oscillator locked to a nominal 100kHz output frequency with ±20% tolerance and ±200ppm/°C temperature coefficient. Its 5-bit PWM register controls duty cycle in 3.125% steps (0%–96.88%), augmented by a separate "full-on" command for true 100% output.

It functions exclusively as a slave on a standard- or fast-mode I²C bus (100kHz/400kHz SCL), using A0–A2 address pins to support up to eight devices on one bus. The PWMO output swings rail-to-rail (0V to VCC) with 2mA drive capability and high-impedance shutdown state.

Key Specifications

Pinout & Package

DS1052U-100+ is housed in an 8-pin SOP package with 118-mil body width and standard gull-wing lead form. Pin spacing is 0.050" (1.27mm), compatible with automated assembly and IPC-7351B footprint standards.

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 performance in a smaller SOP package for space-constrained designs; compared with TLC59108IPWR, it provides simpler single-channel control, lower standby power, and guaranteed 100% duty cycle - making it optimal for cost-sensitive, low-pin-count analog-adjustment tasks.

Availability

DS1052U-100+ is available at Aetrix Electronics and suitable for LCD biasing, DC-DC feedback tuning, and battery charge control requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

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 communications applications.

The DS1052 product line delivers compact, low-power, I²C-addressable PWM generators optimized for display control, power regulation, and sensor excitation in resource-constrained embedded systems.

FAQ

What is the exact output frequency tolerance of the DS1052U-100+?

The DS1052U-100+ has a nominal output frequency of 100kHz with a specified tolerance of ±20%. This means the actual frequency may range from 80kHz to 120kHz under recommended operating conditions. The variation arises from process, voltage, and temperature effects - confirmed in the AC Electrical Characteristics table (Note 12) and Typical Operating Characteristics plots showing frequency vs. temperature and supply voltage.

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

Yes, the DS1052U-100+ supports true 100% duty cycle via a dedicated "Set PWM Duty Cycle 100%" command (Figure 4b), distinct from its 5-bit register's maximum of 96.88%. This command forces PWMO to remain high continuously, enabling full conduction for applications like MOSFET gate drive or enable signaling. The DS1052U-100+ datasheet explicitly confirms this function in the OPERATION section and Command Protocol diagrams.

What is the minimum and maximum supply voltage for reliable operation of the DS1052U-100+?

The DS1052U-100+ operates reliably from 2.7V to 5.5V, as defined in the Recommended DC Operating Conditions table. Below 2.7V, internal logic and oscillator may become unstable; above 5.5V risks exceeding absolute maximum ratings. This range allows direct connection to common 3.3V and 5V system rails without regulators or level shifters - verified across all electrical characteristics tables and functional descriptions.

How many DS1052U-100+ devices can share the same I²C bus, and what determines uniqueness?

Up to eight DS1052U-100+ devices can share one I²C bus, determined by the three hardware address pins A0, A1, and A2. Each pin must be tied to VCC or GND to configure a unique 3-bit slave address (000–111), combined with the fixed 4-bit device identifier 0101 to form the full 7-bit address. This addressing scheme is documented in the SLAVE ADDRESS section and Figure 3 of the DS1052U-100+ datasheet.

What happens to the PWMO output during shutdown mode of the DS1052U-100+?

During shutdown mode, the PWMO output of the DS1052U-100+ enters a high-impedance (Hi-Z) state, effectively disconnecting it from the load. This is explicitly stated in the DESCRIPTION and COMMAND AND PROTOCOL sections: "The PWMO output will be high impedance" when shutdown is commanded. The device draws ≤1µA, and the prior duty cycle setting is retained for immediate recall upon exit - ensuring safe, low-power idle behavior.