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LM34919 Arkusz danych(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM34919
Szczegółowy opis  Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM34919 Arkusz danych(HTML) 1 Page - National Semiconductor (TI)

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June 2, 2008
LM34919
Ultra Small 40V, 600 mA Constant On-Time Buck Switching
Regulator
General Description
The LM34919 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 avail-
able in a micro SMD package. The constant on-time feedback
regulation scheme requires no loop compensation, results in
fast load transient response, and simplifies circuit implemen-
tation. 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 re-
sults in a smooth transition from constant voltage to constant
current mode when current limit is detected, reducing the fre-
quency and output voltage, without the use of foldback. Ad-
ditional features include: VCC under-voltage lockout, thermal
shutdown, gate drive under-voltage lockout, and maximum
duty cycle limiter.
Features
Integrated N-Channel buck switch
Integrated start-up regulator
Input Voltage Range: 8V to 40V
No loop compensation required
Ultra-Fast transient response
Operating frequency remains constant with load current
and input voltage
Maximum switching frequency: 2.0 MHz
Maximum Duty Cycle Limited During Start-Up
Adjustable output voltage
Valley Current Limit At 0.64A
Precision internal reference
Low bias current
Highly efficient operation
Thermal shutdown
Typical Applications
High Efficiency Point-Of-Load (POL) Regulator
Non-Isolated Telecommunication Buck Regulator
Secondary High Voltage Post Regulator
Package
micro SMD
Basic Step Down Regulator
30004431
© 2008 National Semiconductor Corporation
300044
www.national.com


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