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LM34917A Datenblatt(PDF) 1 Page - Texas Instruments

Teilenummer LM34917A
Bauteilbeschribung  Ultra Small 33V, 1.25A Constant On-Time Buck Switching Regulator with Intelligent Current Limit
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LM34917A Datenblatt(HTML) 1 Page - Texas Instruments

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background image
FB
SW
LM34917A
BST
VCC
ISEN
RON/SD
VIN
C1
SHUT
DOWN
SS
RTN
RON
C6
8V - 33V
Input
C3
C4
L1
D1
R1
R3
R2
C2
VOUT
C7
C8
SGND
LM34917A
www.ti.com
SNOSAX7D – DECEMBER 2007 – REVISED MARCH 2013
LM34917A Ultra Small 33V, 1.25A Constant On-Time Buck Switching Regulator with
Intelligent Current Limit
Check for Samples: LM34917A
1
FEATURES
PACKAGE
2
Functional Input Voltage Range: 8V to 33V
12-Bump DSBGA Package
DSBGA package
DESCRIPTION
Input Over-Voltage Shutdown at
≊35V
The
LM34917A
Step-Down
Switching
Regulator
Transient Capability to 50V
features all the functions needed to implement a low
Integrated N-Channel buck switch
cost,
efficient,
buck
bias
regulator
capable
of
supplying at least 1.25A to the load. To reduce
Valley current limit varies with VIN and VOUT to
excessive switch current due to the possibility of a
reduce excessive inductor current
saturating inductor the valley current limit threshold
On-time is reduced when in current limit
changes with input and output voltages, and the on-
Integrated start-up regulator
time is reduced when current limit is detected. This
buck regulator contains an N-Channel Buck Switch,
No loop compensation required
and is available in the 12 pin DSBGA package. The
Ultra-Fast transient response
constant
on-time
feedback
regulation
scheme
Maximum switching frequency: 2 MHz
requires no loop compensation, results in fast load
transient
response,
and
simplifies
circuit
Operating frequency remains nearly constant
implementation. The operating frequency remains
with load current and input voltage variations
constant with line and load variations due to the
Programmable soft-start
inverse relationship between the input voltage and
Precision internal reference
the on-time. The valley current limit results in a
smooth transition from constant voltage to constant
Adjustable output voltage
current mode when current limit is detected, reducing
Thermal shutdown
the frequency and output voltage, without the use of
foldback. Additional features include: VCC under-
TYPICAL APPLICATIONS
voltage
lock-out,
input
over-voltage
shutdown,
thermal shutdown, gate drive under-voltage lock-out,
High Efficiency Point-Of-Load (POL) Regulator
and maximum duty cycle limit.
Non-Isolated Buck Regulator
Secondary High Voltage Post Regulator
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 © 2007–2013, 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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