LTC6992-4 Datasheet

• 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

The LTC6992 is a silicon oscillator with an easy-to-use analog voltage-controlled pulse width modulation (PWM) capability. The LTC6992 is part of the TimerBlox^® family of versatile silicon timing devices.

A single resistor, R_SET, programs the LTC6992’s internal master oscillator frequency. The output frequency is determined by this master oscillator and an internal frequency divider, N_DIV, programmable to eight settings from 1 to 16384.

Applying a voltage between 0V and 1V on the MOD pin sets the duty cycle.

The four versions differ in their minimum/maximum duty cycle. Note that a minimum duty cycle limit of 0% or maximum duty cycle limit of 100% allows oscillations to stop at the extreme duty cycle settings.