Switching Regulator. LM25011 Datasheet

LM25011 Regulator. Datasheet pdf. Equivalent

LM25011 Datasheet
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Part LM25011
Description 42-V 2-A Constant On-Time Switching Regulator
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LM25011, LM25011-Q1, LM25011A, LM25011A-Q1
SNVS617H – APRIL 2009 – REVISED NOVEMBER 2014
LM25011, LM25011-Q1, LM25011A, LM25011A-Q1 42-V 2-A Constant On-Time Switching
Regulator With Adjustable Current Limit
1 Features
1 LM25011-Q1 is an Automotive Grade Product that
is AEC-Q100 Grade 1 Qualified (–40°C to +125°C
Operating Junction Temperature)
• LM25011A Allows Low-Dropout Operation at High
Switching Frequency
• Input Operating Voltage Range: 6 V to 42 V
• Absolute Maximum Input Rating: 45 V
• Integrated 2-A N-Channel Buck Switch
• Adjustable Current Limit Allows for Smaller
Inductor
• Adjustable Output Voltage from 2.51 V
• Minimum Ripple Voltage at VOUT
• Power Good Output
• Switching Frequency Adjustable to 2 MHz
• COT Topology Features:
– Switching Frequency Remains Nearly
Constant with Load Current and Input Voltage
Variations
– Ultra-Fast Transient Response
– No Loop Compensation Required
– Stable Operation with Ceramic Output
Capacitors
– Allows for Smaller Output Capacitor and
Current Sense Resistor
• Adjustable Soft-Start Timing
• Thermal Shutdown
• Precision 2% Feedback Reference
• Package: 10-Pin, HVSSOP
• Create a Custom Design Using the LM25011
Family with the WEBENCH Power Designer
2 Applications
• Automotive Safety
• Infotainment
• Telecommunication
• Front Camera
3 Description
The LM25011 constant on-time step-down switching
regulator features all the functions needed to
implement a low-cost, efficient, buck bias regulator
capable of supplying up to 2 A of load current. This
high-voltage regulator contains an N-Channel Buck
switch, a startup regulator, current limit detection, and
internal ripple control. The constant on-time
regulation principle requires no loop compensation,
results in fast load transient response, and simplifies
circuit implementation. The operating frequency
remains constant with line and load. The adjustable
valley current limit detection results in a smooth
transition from constant voltage to constant current
mode when current limit is reached, without the use
of current limit foldback. The PGD output indicates
the output voltage has increased to within 5% of the
expected regulation value. Additional features
include: Low output ripple, VIN under-voltage lock-
out, adjustable soft-start timing, thermal shutdown,
gate drive pre-charge, gate drive under-voltage lock-
out, and maximum duty cycle limit.
The LM25011A has a shorter minimum off-time than
the LM25011, which allows for higher frequency
operation at low input voltages.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM25011 / -Q1
LM25011A / -Q1
HVSSOP (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
6V to 42V
Input
CIN
VIN
BST
LM25011
RT
SW
CBST
L1
VPGD
Power
Good
RPGD
CSS
RT
PGD
SS
SGND
D1
CS
RS
CSG
FB
RFB2
RFB1
VOUT
COUT
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



Texas Instruments LM25011
LM25011, LM25011-Q1, LM25011A, LM25011A-Q1
SNVS617H – APRIL 2009 – REVISED NOVEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ..................................... 4
6.2 Handling Ratings: LM25011...................................... 4
6.3 Handling Ratings: LM25011-Q1................................ 4
6.4 Recommended Operating Conditions....................... 4
6.5 Thermal Information .................................................. 5
6.6 Electrical Characteristics........................................... 6
6.7 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 15
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application .................................................. 16
9 Power Supply Recommendations...................... 23
10 Layout................................................................... 23
10.1 Layout Guidelines ................................................. 23
10.2 Layout Example .................................................... 23
10.3 Power Dissipation ................................................. 23
11 Device and Documentation Support ................. 24
11.1 Custom Design with WEBENCH Tools................. 24
11.2 Receiving Notification of Documentation Updates 24
11.3 Related Links ........................................................ 24
11.4 Trademarks ........................................................... 24
11.5 Electrostatic Discharge Caution ............................ 24
11.6 Glossary ................................................................ 24
12 Mechanical, Packaging, and Orderable
Information ........................................................... 24
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision G (February 2013) to Revision H
Page
• Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device
Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout
section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information
section ................................................................................................................................................................................... 1
Changes from Revision F (February 2013) to Revision G
Page
• Changed layout of National Semiconductor Data Sheet to TI format .................................................................................. 23
2
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Copyright © 2009–2014, Texas Instruments Incorporated
Product Folder Links: LM25011 LM25011-Q1 LM25011A LM25011A-Q1



Texas Instruments LM25011
www.ti.com
5 Pin Configuration and Functions
LM25011, LM25011-Q1, LM25011A, LM25011A-Q1
SNVS617H – APRIL 2009 – REVISED NOVEMBER 2014
10-Pin
HVSSOP Package
Top View
Exposed Pad on Bottom
Connect to Ground
VIN
1
RT
2
PGD
3
SS
4
SGND
5
10
BST
9
SW
8
CS
7
CSG
6
FB
PIN
NUMBER NAME
1
VIN
2
RT
3
PGD
4
SS
5
SGND
6
FB
7
CSG
8
CS
9
SW
10
BST
-
EP
Pin Functions
I/O
DESCRIPTION
APPLICATION INFORMATION
I
Input supply voltage
Operating input range is 6 V to 42 V. Transient capability is 45 V.
A low ESR capacitor must be placed as close as possible to the
VIN and SGND pins.
I
On-time Control
An external resistor from VIN to this pin sets the buck switch on-
time and the switching frequency.
Power Good
Logic output indicates when the voltage at the FB pin has
increased to above 95% of the internal reference voltage.
Hysteresis is provided. An external pull-up resistor to a voltage
less than 7 V is required.
I
Soft-Start
An internal current source charges an external capacitor to
provide the soft-start function.
Signal Ground
Ground for all internal circuitry other than the current limit sense
circuit.
I
Feedback
Internally connected to the regulation comparator. The regulation
level is 2.51 V.
Current Sense Ground
Ground connection for the current limit sensing circuit. Connect to
ground and to the current sense resistor.
I
Current sense
Connect to the current sense resistor and the anode of the free-
wheeling diode.
O
Switching Node
Internally connected to the buck switch source. Connect to the
external inductor, cathode of the free-wheeling diode, and
bootstrap capacitor.
I
Bootstrap capacitor connection of Connect a 0.1-µF capacitor from SW to this pin. The capacitor is
the buck switch gate driver.
charged during the buck switch off-time via an internal diode.
Exposed Pad
Exposed pad on the underside of the package. This pad should
be soldered to the PC board ground plane to aid in heat
dissipation.
Copyright © 2009–2014, Texas Instruments Incorporated
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Product Folder Links: LM25011 LM25011-Q1 LM25011A LM25011A-Q1







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