A silicon oscillator with simple analog voltage-controlled pulse width modulation (PWM) capabilities is the LTC®6992. The TimerBlox® series of flexible silicon timing devices includes the LTC6992. The internal master oscillator frequency of the LTC6992 is controlled by a single resistor, RSET. This master oscillator and an inbuilt frequency divider, NDIV, which has eight adjustable values ranging from 1 to 16384, decide the output frequency.

The duty cycle is set by applying a voltage to the MOD pin between 0V and 1V. The minimum and maximum duty cycles of the four models vary. It should be noted that oscillations can be stopped at the extreme duty cycle levels by setting a minimum duty cycle limit of 0% or a maximum duty cycle limit of 100%.

Pulse Width Modulation (PWM) Controlled by Simple 0V to 1V Analog Input

Four Available Options Define Duty Cycle Limits

Minimum Duty Cycle at 0% or 5%

Maximum Duty Cycle at 95% or 100%

Frequency Range: 3.81Hz to 1MHz

Configured with 1 to 3 Resistors

<1.7% Maximum Frequency Error

PWM Duty Cycle Error < 3.7% Maximum

Frequency Modulation (VCO) Capability

2.25V to 5.5V Single Supply Operation

115μA Supply Current at 100kHz

500μs Start-Up Time

CMOS Output Driver Sources/Sinks 20mA

–55°C to 125°C Operating Temperature Range

Available in Low Profile (1mm) SOT-23 (ThinSOT™) and 2mm × 3mm DFN

AEC-Q100 Qualified for Automotive Applications

PWM Servo Loops

Heater Control

LED Dimming Control

High Vibration, High Acceleration Environments

Portable and Battery-Powered Equipment