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.