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LM34919C-Q1 Datasheet Preview

LM34919C-Q1 Datasheet

600mA Constant On-Time Buck Switching Regulator

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LM34919C-Q1
www.ti.com
SNVS831A – SEPTEMBER 2013 – REVISED DECEMBER 2013
LM34919C-Q1 Ultra Small 50V, 600 mA Constant On-Time Buck Switching Regulator
Check for Samples: LM34919C-Q1
FEATURES
1
2 AEC-Q100 qualified (Tj = -40°C to 125°C)
• Maximum Switching Frequency: 2.6 MHz
• Input Voltage Range: 4.5 V to 50 V
• Integrated N-Channel buck switch
• Integrated Start-Up Regulator
• No Loop Compensation Required
• Ultra-Fast Transient Response
• Operating Frequency Remains Constant with
Load Current and Input Voltage
• Adjustable Output Voltage
• Power Good Output
• Enable Input
• Valley Current Limit at 0.64 A Typical
• Precision Internal Voltage Reference
• Low IQ Shutdown (<10 µA)
• Highly Efficient Operation
• Thermal Shutdown
• 12-Bump 2 mm x 2 mm DSBGA and 12-pin 4
mm x 4 mm WSON Packages
APPLICATIONS
• Automotive Safety and Infotainment
• High Efficiency Point-of-Load (POL) Regulator
• Telecommunication Buck Regulator
• Secondary Side Post Regulator
DESCRIPTION
The LM34919C Step Down Switching Regulator
features all of the functions needed to implement a
low-cost, efficient, buck bias regulator capable of
supplying 0.6 A to the load. This buck regulator
contains an N-Channel Buck Switch and is available
in DSBGA and WSON packages. 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:
Power Good, enable, VCC undervoltage lockout,
thermal shutdown, gate drive undervoltage lockout,
and maximum duty cycle limiter.
4.5V - 50V
Input
C1 C5
REN
RON
VOUT
RPGD
PGD
VIN VCC
LM34919C
RON
EN
BST
PGD
SW
SS ISEN
C6
FB
RTN
SGND
C3
C4
L1
D1
R1
R2
VOUT
R3
C2
Figure 1. 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.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated




etcTI

LM34919C-Q1 Datasheet Preview

LM34919C-Q1 Datasheet

600mA Constant On-Time Buck Switching Regulator

No Preview Available !

LM34919C-Q1
SNVS831A – SEPTEMBER 2013 – REVISED DECEMBER 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings(1)
VIN, EN , RON to RTN
BST to RTN
SW to RTN (Steady State)
SW to VIN
BST to VCC
BST to SW
VCC to RTN
PGD
SGND to RTN
SS to RTN
FB to RTN
Storage Temperature Range
ESD Rating HBM
Junction Temperature
VALUE
65
79
–1.5 to 65
+0.3
65
14
14
14
–0.3 to 0.3
–0.3 to 4
–0.3 to 7
–65 to 150
2
150
UNIT
V
V
V
V
V
V
V
V
V
V
V
ºC
kV
ºC
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only and functional operation of the devices at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Recommended Operating Conditions (1)
VIN
Junction Temperature
VALUE
4.5 to 50
40 to 125
UNIT
V
°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which the
device is intended to be fully functional. For verified specifications and test conditions, see Electrical Characteristics.
2 Submit Documentation Feedback
Product Folder Links: LM34919C-Q1
Copyright © 2013, Texas Instruments Incorporated


Part Number LM34919C-Q1
Description 600mA Constant On-Time Buck Switching Regulator
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