SNVS375B – OCTOBER 2005 – REVISED APRIL 2013
LM2696 3A, Constant On Time Buck Regulator
Check for Samples: LM2696
•2 Input Voltage Range of 4.5V–24V
• Constant On-Time
• No Compensation Needed
• Maximum Load Current of 3A
• Switching Frequency of 100 kHz–500 kHz
• Constant Frequency Across Input Range
• TTL Compatible Shutdown Thresholds
• Low Standby Current of 12 µA
• 130 mΩ Internal MOSFET Switch
• High Efficiency Step-Down Switching
• LCD Monitors
• Set-Top Boxes
The LM2696 is a pulse width modulation (PWM) buck
regulator capable of delivering up to 3A into a load.
The control loop utilizes a constant on-time control
scheme with input voltage feed forward. This provides
a topology that has excellent transient response
without the need for compensation. The input voltage
feed forward ensures that a constant switching
frequency is maintained across the entire VIN range.
The LM2696 is capable of switching frequencies in
the range of 100 kHz to 500 kHz. Combined with an
integrated 130 mΩ high side NMOS switch the
LM2696 can utilize small sized external components
and provide high efficiency. An internal soft-start and
power-good flag are also provided to allow for simple
sequencing between multiple regulators.
The LM2696 is available with an adjustable output in
an exposed pad HTSSOP-16 package.
Typical Application Circuit
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