Analog Devices Inc. LTC1041CS8#PBF

Overview

LTC1041CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower CMOS bang-bang controller IC used for precision ON-OFF control loops. It features ±0.5mV max SET POINT error, ±0.1% deadband accuracy, 2.8V to 16V supply range, TTL-compatible outputs at 5V, and 8-pin SO package. It enables ultra-low-power thermostat and battery charger designs with sampled-data operation.

For engineers reviewing the LTC1041CS8#PBF datasheet, LTC1041CS8#PBF pinout, LTC1041CS8#PBF application, or LTC1041CS8#PBF equivalent, key selection factors include guaranteed deadband tolerance, VP-P switched power output for ratiometric sensor networks, sampling-rate programmability via external RC, input voltage range from ground to V+, and dual independent ground-referred control inputs.

Technical Context

The LTC1041CS8#PBF implements a sampled-data bang-bang control architecture using dual differential comparators and an internal timing generator. Each sample cycle activates analog circuitry for ≈80µs to compare VIN against (SET POINT ± DELTA), then powers down to achieve ultralow average current - as low as 1.5µW at 1 sample/second.

Its unique input structure supports independent SET POINT and DELTA adjustment without interaction, while the VP-P output drives resistive networks only during active sampling, eliminating self-heating errors in thermistor-based thermostats. Input impedance is frequency-dependent (RIN = 1/(fS × 66pF)), and response time is fixed at 60–100µs, independent of overdrive.

Key Specifications

Pinout & Package

Package: 8-lead plastic small-outline (SO-8, narrow 0.150-inch body), RoHS-compliant, JEDEC MS-012 variant. Thermal resistance θJA = 150°C/W; operating junction temperature up to 150°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bang-bang control applications.

Compared with LTC1041CS8#PBF, the CN8 variant offers identical functionality in through-hole form but with higher thermal resistance, while the MJ8 provides wider temperature range in hermetic packaging but is obsolete and unsuitable for new designs.

Availability

LTC1041CS8#PBF is available at Aetrix Electronics and suitable for thermostat control, battery charger regulation, motor speed control, and industrial ON-OFF process control requiring stable component supply across automotive, industrial, and building automation programs.

Supply support for LTC1041CS8#PBF 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 acquired Linear Technology in 2017 and maintains its precision analog product lines, including legacy CMOS timing and control ICs designed for low-power, high-accuracy applications.

The LTC1041CS8#PBF belongs to Linear's ultralow-power bang-bang controller family, engineered specifically for energy-constrained ON-OFF regulation tasks where self-heating, supply flexibility, and hysteresis precision are critical.

FAQ

What is the minimum sampling frequency supported by the LTC1041CS8#PBF?

The LTC1041CS8#PBF supports sampling frequencies down to 0.01Hz (1 sample per 100 seconds), achieved using REXT = 10MΩ and CEXT = 0.1µF. At this rate, average supply current drops to ~1.5µW, making it ideal for multi-year battery-powered thermostats. The oscillator remains functional across the full REXT range (100kΩ–10MΩ), with no lower bound imposed by internal circuitry.

How does the VP-P output improve accuracy in thermistor-based thermostats?

The VP-P output of the LTC1041CS8#PBF applies power to the thermistor only during the ≈80µs sampling window, eliminating continuous self-heating that causes up to 3.8°F measurement error. This pulsed excitation preserves thermistor self-heating coefficient integrity, enabling accurate 50°F–100°F range control with 2.4µW total system power - confirmed in Linear's TA01 reference design.

Can the LTC1041CS8#PBF operate from a 3.3V supply?

Yes, the LTC1041CS8#PBF operates from 2.8V to 16V, so 3.3V is fully supported. At 3.3V, ON/OFF output VOH remains ≥2.4V (with 360µA sink), meeting TTL logic thresholds, and SET POINT error stays within ±0.5mV. However, VP-P output swing is reduced to ~3.3V, requiring ratiometric scaling of downstream references accordingly.

What is the maximum source resistance allowed at the VIN input without added error?

The LTC1041CS8#PBF guarantees minimal error for VIN source resistances ≤10kΩ. Above this, incomplete charging of the internal 33pF sampling capacitor introduces voltage error. For RS > 10kΩ, a bypass capacitor CS ≥1µF is required; error magnitude is given by VERROR = VIN [2CIN/(2CIN + CS) + RS/(RS + RIN)], where RIN = 1/(fS × 66pF).

Is the LTC1041CS8#PBF pin-compatible with other members of the LTC1041 family?

Yes, all LTC1041 variants - including LTC1041CS8#PBF, LTC1041CN8#PBF, and LTC1041MJ8#PBF - share identical 8-pin SO, PDIP, and CERDIP footprints and pinouts. Electrical specifications are identical across packages; only thermal performance (θJA), package type, and temperature grade differ. No PCB redesign is needed when substituting between S8, N8, or J8 variants.