LM2695 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – High Voltage (30V, 1.25A) Step Down Switching Regulator

January 2006
LM2695
High Voltage (30V, 1.25A) Step Down Switching
Regulator
General Description
The LM2695 Step Down Switching Regulator features all of
the functions needed to implement a low cost, efficient, buck
bias regulator capable of supplying 1.25A to the load. This
buck regulator contains a 33V N-Channel Buck Switch, and
is available in the thermally enhanced LLP-10 and TSSOP-
14EP packages. The hysteretic regulation scheme requires
no loop compensation, results in fast load transient re-
sponse, 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 current limit detection is set at 1.25A. Additional
features include: VCC under-voltage lockout, thermal shut-
down, gate drive under-voltage lockout, and maximum duty
cycle limiter.
Features
n Integrated 33V, N-Channel buck switch
n Integrated start-up regulator
n Input Voltage Range: 8V to 30V
n No loop compensation required
n Ultra-Fast transient response
n Operating frequency remains constant with load current
and input voltage
n Maximum Duty Cycle Limited During Start-Up
n Adjustable output voltage
n Valley Current Limit At 1.25A
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
Package
n LLP-10 (4 mm x 4 mm)
n TSSOP-14EP
n Exposed Thermal Pad For Improved Heat Dissipation
Basic Step Down Regulator
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