1FEATURES
2• Integrated N-Channel Buck Switch
• Integrated Start-Up Regulator
• Input Voltage Range: 8V to 30V
• No Loop Compensation Required
• Ultra-Fast Transient Response
• Operating Frequency Remains Constant with
Load Current and Input Voltage Variations
• Maximum Duty Cycle Limited During Start-Up
• Adjustable Output Voltage
• Valley Current Limit At 0.6A
• Maximum Switching Frequency: 1 MHz
• Precision Internal Reference
• Low Bias Current under•
Highly Efficient Operation under•
Thermal Shutdown

TYPICAL APPLICATIONS
• High Efficiency Point-Of-Load (POL) Regulator
• Non-Isolated Telecommunication Buck
Regulator
• Secondary High Voltage Post Regulator

DESCRIPTION
The LM2694 Step Down Switching Regulator features
all of the functions needed to implement a low cost,
efficient, buck bias regulator capable of supplying
0.6A to the load. This buck regulator contains an N-
Channel Buck Switch, and is available in the 3 x 3
thermally enhanced WSON-10 package and a TSSOP-14 package. The feedback regulation
scheme requires no loop compensation, results in
fast load transient response, and simplifies circuit
implementation. The operating frequency remains
constant with line and load variations due to the inverse relationship between the input voltage and
the on-time. The valley current limit results in a
smooth transition from constant voltage to constant
current mode when current limit is detected, reducing
the frequency and output voltage, without the use of
foldback. Additional features include: VCC under•
voltage lockout, thermal shutdown, gate drive under•
voltage lockout, and maximum duty cycle limiter.