LM2694 Datasheet, PDF (1/19 Pages) National Semiconductor (TI) – 30V, 600 mA Step Down Switching Regulator

May 2006
LM2694
30V, 600 mA Step Down Switching Regulator
General 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 LLP-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 operat-
ing 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 fea-
tures include: VCC under-voltage lockout, thermal shut-
down, gate drive under-voltage lockout, and maximum duty
cycle limiter.
n No loop compensation required
n Ultra-Fast transient response
n Operating frequency remains constant with load current
and input voltage variations
n Maximum Duty Cycle Limited During Start-Up
n Adjustable output voltage
n Valley Current Limit At 0.6A
n Maximum switching frequency: 1 MHz
n Precision internal reference
n Low bias current
n Highly efficient operation
n Thermal shutdown
Typical Applications
n High Efficiency Point-Of-Load (POL) Regulator
n Non-Isolated Telecommunication Buck Regulator
n Secondary High Voltage Post Regulator
Features
n Integrated N-Channel buck switch
n Integrated start-up regulator
n Input Voltage Range: 8V to 30V
Package
n LLP-10 (3 mm x 3 mm) w/Exposed Pad
n TSSOP-14
Basic Step Down Regulator
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