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LM34919 Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części LM34919
Szczegółowy opis  Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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LM34919 Arkusz danych(HTML) 1 Page - Texas Instruments

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VIN
SW
BST
LM34919
VCC
SS
RON/SD
8V - 40V
Input
C1
RON
R2
R1
C2
VOUT
L1
C3
C4
D1
C6
RTN
ISEN
SGND
FB
SHUTDOWN
R3
LM34919
www.ti.com
SNOSAY2D – MAY 2007 – REVISED JUNE 2008
Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
Check for Samples: LM34919
1
FEATURES
2
Integrated N-Channel buck switch
Precision internal reference
Integrated start-up regulator
Low bias current
Input Voltage Range: 8V to 40V
Highly efficient operation
No loop compensation required
Thermal shutdown
Ultra-Fast transient response
Micro SMD Package
Operating frequency remains constant with
APPLICATIONS
load current and input voltage
High Efficiency Point-Of-Load (POL) Regulator
Maximum switching frequency: 2.0 MHz
Non-Isolated Telecommunication Buck
Maximum Duty Cycle Limited During Start-Up
Regulator
Adjustable output voltage
Secondary High Voltage Post Regulator
Valley Current Limit At 0.64A
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 available 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 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.
Basic Step Down Regulator
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007–2008, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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