LTC6992IS6-1 - TimerBlox V-Controlled PWM, 3.81Hz-1MHz | ADI
MPN: LTC6992IS6-1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.74 | $37.40 |
| 100 | $3.04 | $304.00 |
| 500 | $2.66 | $1,330.00 |
| 1,000 | $2.27 | $2,270.00 |
LTC6992IS6-1 Overview
A silicon oscillator (a.k.a. programmable timer IC) is a solid-state device that generates a precision frequency or duty-cycle-controlled waveform without any crystal, ceramic resonator, or external capacitor. Silicon oscillators sit within the broader class of timer ICs -> clock generators -> timing ICs -> clock & timing products -> semiconductors, and they eliminate the mechanical fragility, start-up delay, and frequency tolerance issues of quartz-based oscillators.
Key features include: a single resistor RSET programs the master frequency from 3.81 Hz to 1 MHz across four decades; the MOD pin accepts 0 V to 1 V to set duty cycle; ±15% frequency accuracy with no external trim; 1.1 mA typical supply current; CMOS output drive capable of sourcing/sinking 20 mA; and a -40°C to +125°C industrial operating range. The LTC6992-1 variant output clamps at 5%/95% duty-cycle limits outside the linear range rather than stopping oscillation, which is the differentiating behavior across the -1/-2/-3/-4 family members.
Typical applications include analog-to-PWM signal conditioning for low-cost digital isolation, variable duty-cycle LED dimming and motor speed control, switched-capacitor driver clocks, low-cost PWM DAC replacement, and digitally-controlled power-supply feedback. Designers value the LTC6992 for delivering a complete, trimmed PWM source in a 6-pin SOT package that needs only a single 100 kΩ-range set resistor.
Drop-in alternatives for LTC6992IS6-1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC6992HS6-1
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6992IS6-2
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6992IS6-3
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6992IS6-4
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6992MPS6-1
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6994IS6-1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6992IS6-1 Specifications
| Function | Silicon oscillator with voltage-controlled PWM |
| Series | TimerBlox |
| Variant | LTC6992-1 (output clamps at 5%/95% outside linear range) |
| Output Frequency Range | 3.81 Hz to 1 MHz |
| Supply Voltage (V+) | 2.25 V to 5.5 V |
| Supply Current | 1.1 mA typical |
| Frequency Accuracy | ±15% (no external trim required) |
| Duty-Cycle Control Range | 5% to 95% (linear 10% to 90%) |
| MOD Input Voltage Range | 0 V to 1 V (sets 0%-100% duty) |
| Output Type | CMOS, rail-to-rail |
| Output Drive | ±20 mA |
| Programming Resistor (RSET) | Single external resistor to GND |
| Operating Temperature | -40°C to +125°C |
| Package | 6-pin TSOT-23 (S6) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
LTC6992IS6-1 Pin Configuration
| Pin 1 | GND — Ground reference for the IC |
| Pin 2 | MOD — Duty-cycle control voltage input (0 V to 1 V sets 0% to 100% duty) |
| Pin 3 | RSET — Frequency-set resistor to GND; programs master period |
| Pin 4 | V+ — Positive supply input, 2.25 V to 5.5 V |
| Pin 5 | OUT — CMOS PWM output, ±20 mA drive |
| Pin 6 | VSET — Reference voltage; tie to GND for internal 1 V reference |
Typical Applications
LTC6992IS6-1 is suitable for 7 applications: Analog-to-PWM Signal Isolation, Variable Duty-Cycle LED Dimming, Switched-Capacitor Converter Clock Generation, Low-Cost PWM DAC Replacement, Digitally-Controlled Power Supply Feedback, Brushed DC Motor Speed Control, Sensor Pulse-Width Modulation Output.
Analog-to-PWM Signal Isolation
The LTC6992IS6-1 converts a 0-1 V analog signal on its MOD pin into a CMOS PWM duty cycle, providing a low-cost pathway for analog-to-digital isolation through a single optocoupler or digital isolator. Engineers use this technique to transmit analog sensor readings (temperature, pressure, gain) across galvanic barriers without expensive ADC-isolator pairs. The 3.81 Hz to 1 MHz range covers instrumentation bandwidths (1-10 kHz PWM carrier) while the ±20 mA output directly drives an optocoupler LED without buffering. Low 1.1 mA quiescent current suits battery-powered isolated sensor transmitters.
Recommended
Variable Duty-Cycle LED Dimming
The LTC6992IS6-1 drives high-brightness LEDs with a CMOS PWM output whose duty cycle is continuously variable from 5% to 95% via the MOD pin. This analog-domain dimming preserves LED color temperature (unlike current-based dimming) while maintaining conversion efficiency. The ±20 mA output directly drives logic-level MOSFET gates, and the 3.81 Hz to 1 MHz frequency range covers everything from flicker-free display backlighting (>100 Hz) to high-frequency switching regulator synchronisation. The TSOT-23-6 package fits inside LED bulb base PCBs.
Recommended
Switched-Capacitor Converter Clock Generation
The LTC6992IS6-1 provides a compact, capacitor-free clock source for switched-capacitor voltage converters and charge pumps. Its 3.81 Hz to 1 MHz frequency range covers typical SC converter operating points (10 kHz to 500 kHz), and the 50% nominal duty cycle (adjustable via MOD) minimizes input ripple for symmetric charge-pump topologies. The CMOS output drives the converter's switching FETs directly through small gate resistors, eliminating the need for a separate oscillator IC. Industrial -40°C to +125°C rating suits harsh-environment power designs.
Recommended
Low-Cost PWM DAC Replacement
The LTC6992IS6-1 functions as a 1-bit PWM DAC: an external RC low-pass filter on the OUT pin reconstructs the MOD voltage as an analog output, achieving 8-10 effective bits at audio bandwidths. Compared to a dedicated 8-bit DAC IC, this approach reduces BOM cost to a single 6-pin TimerBlox IC plus one resistor and one capacitor. Frequency is set above the audio band (>20 kHz) to allow simple filtering, while duty-cycle resolution derives from the MOD pin's analog voltage. Industrial-grade timing accuracy is sufficient for trim, bias, and setpoint generation.
Recommended
Digitally-Controlled Power Supply Feedback
The LTC6992IS6-1 implements a simple PWM-based feedback loop in digitally-set power supplies, where a microcontroller's DAC output drives the MOD pin to program converter operating point (frequency or duty cycle) without analog compensation networks. The TSOT-23-6 footprint fits alongside small buck/boost converters, and the 5%/95% clamping protects downstream MOSFETs from shoot-through at extreme DAC values. RSET frequency programming allows per-rail optimization without firmware timer reconfiguration.
Recommended
Brushed DC Motor Speed Control
The LTC6992IS6-1 generates the variable-duty PWM signal that drives a brushed DC motor through an H-bridge MOSFET driver. The MOD pin accepts a potentiometer or analog control voltage (0-1 V) for direct knob-based speed adjustment, eliminating microcontroller firmware entirely. The 5%-95% clamping of the -1 variant prevents the motor from stalling at 0% or running uncontrolled at 100% duty, protecting the gearbox. Frequency is programmed above the audible band (>20 kHz) via RSET for silent operation.
Recommended
Sensor Pulse-Width Modulation Output
The LTC6992IS6-1 enables low-cost PWM-output sensors by acting as the carrier oscillator, with a sensor's analog output (e.g., from a thermistor bridge) modulating the duty cycle via the MOD pin. The resulting PWM signal is digital and easily read by any microcontroller timer capture input or by an optocoupler for isolated transmission. The 3.81 Hz to 1 MHz range allows bandwidth tuning per sensor type, while the small TSOT-23-6 footprint keeps the BOM under 10 components for the complete sensor module.
Recommended
Recommended Products Summary
Engineering reference data for LTC6992IS6-1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC6992HS6-1 | LTC6992IS6-2 | LTC6992IS6-3 | LTC6992IS6-4 | LTC6994IS6-1 |
|---|---|---|---|---|---|---|
| Package | TSOT-23-6 (S6) | TSOT-23-6 (S6) - same | TSOT-23-6 (S6) - same | TSOT-23-6 (S6) - same | TSOT-23-6 (S6) - same | TSOT-23-6 (S6) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Function | V-Controlled PWM | V-Controlled PWM (H temp grade) | V-Controlled PWM (0%/100% clamp) | V-Controlled PWM (inverted) | Phase/Frequency Detector | Delay / Frequency Shift |
| Output Frequency Range | 3.81 Hz to 1 MHz | 3.81 Hz to 1 MHz | 3.81 Hz to 1 MHz | 3.81 Hz to 1 MHz | 3.81 Hz to 1 MHz | 1 µs to 33.6 s delay |
| Supply Voltage | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V |
| Output Behavior Outside Linear Range | Clamps at 5%/95% | Clamps at 5%/95% | Stops at 0%/100% | Stops at 0%/100% (inverted) | Phase detector mode | Delay-clamped |
| Operating Temperature | -40C to +125C (I grade) | -40C to +125C (H grade) | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Output Drive | ±20 mA CMOS | ±20 mA CMOS | ±20 mA CMOS | ±20 mA CMOS | ±20 mA CMOS | ±20 mA CMOS |
Key Differentiators
- 5%/95% clamping protects downstream drivers (vs LTC6992IS6-2)
- Single-resistor frequency programming eliminates capacitor (vs NE555 / LM555 timer)
- Analog-domain PWM control without firmware (vs Microcontroller PWM output)
Design Notes
Place the RSET resistor as close as possible to the RSET pin (pin 3) with a short, direct trace to the GND pin (pin 1). Stray capacitance on the RSET node can shift the programmed frequency by 5-10% at higher frequencies (>500 kHz). A ground plane directly under the device minimizes RSET pin coupling.
Estimated: With a 5 V supply and 1.1 mA quiescent current, the LTC6992IS6-1 draws approximately 5.5 mW continuously. Decouple V+ (pin 4) with a 0.1 µF X7R ceramic capacitor within 5 mm of the pin; a 10 µF bulk capacitor is recommended if the device shares a rail with noisy switching converters. The CMOS output swing approaches both rails, so a clean V+ improves output rise/fall symmetry.
Do not float the MOD pin (pin 2); tie it to a defined voltage through a buffer or to VSET (pin 6) for default 50% duty. Leaving MOD floating causes unpredictable duty cycle from PCB leakage. Similarly, the VSET pin should be tied to GND to enable the internal 1 V reference, not left floating. Failure to follow these connections is the most common cause of LTC6992 misbehavior in prototypes.
Compliance Information
RoHS and lead-free per ADI product page; halogen-free status not explicitly stated in verified web data - set to unknown per data authenticity rules. AEC-Q100 not applicable for this industrial-grade timing IC.
