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LM25141-Q1 Datasheet Preview

LM25141-Q1 Datasheet

Wide Input Range Synchronous Buck Controller

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LM25141-Q1
SNVSAP9A – MARCH 2017 – REVISED FEBRUARY 2018
LM25141-Q1 2.2-MHz, 42-V Synchronous Buck Controller With Low IQ
1 Features
2 Applications
1 AEC-Q100 Qualified for Automotive Applications:
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C4B
• VIN 3.8 V to 42 V (47 V Absolute Maximum)
• Output: Fixed 3.3 V, 5 V, or Adjustable From
1.5 V to 15 V With ±0.8% Accuracy
• Optional Frequency Shift by Varying an Analog
Voltage or RT Resistor
• Meets CISPR 25 / EN 55025 EMI Standards
– Fixed 2.2-MHz or 440-kHz Switching
Frequency With ±5% Accuracy
– High-Side and Low-Side Gate Drive With Slew
Rate Control
– Optional Spread Spectrum
• Optional Synchronization to an External Clock
• Shutdown Mode IQ: 10 µA Typical
• Low Standby Mode IQ: 35 µA Typical
• 75-mV Current Limit Threshold With ±0.9%
Accuracy
• External Resistor or DCR Current Sensing
• Output Enable Logic Input
• Hiccup Mode for Sustained Overload
• Power-Good Indication Output
• Selectable Diode Emulation or Forced PWM
• VQFN-24 Package With Wettable Flanks
• Create a Custom Design Using the LM25141-Q1
With the WEBENCH® Power Designer
• Automotive Applications Including:
– Infotainment Systems
– Instrumentation Clusters
– Advanced Driver Assistance Systems (ADAS)
3 Description
The LM25141-Q1 is a synchronous buck controller,
intended for high-voltage, wide-VIN, step-down
regulator applications. The control method is peak
current-mode control. Current-mode control provides
inherent line feed-forward, cycle-by-cycle current
limiting, and ease of loop compensation. The
LM25141-Q1 features slew rate control to simplify the
compliance with CISPR and automotive EMI
requirements.
The LM25141-Q1 has two selectable switching
frequencies: 2.2 MHz and 440 kHz. Gate drivers with
slew rate control can be adjusted to reduce EMI.
In light or no-load conditions, the LM25141-Q1
operates in skip cycle mode for improved low power
efficiency. The LM25141-Q1 has a high-voltage bias
regulator with automatic switch-over to an external
bias to reduce the IQ current from VIN. Additional
features include frequency synchronization, cycle-by-
cycle current limit, hiccup-mode fault protection for
sustained overload, and power-good output.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM25141-Q1
VQFN (24)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
CRES
VIN
CIN
CSS
CDITH
VIN
VCC
RES
SS
DITH
LM25141-Q1
EN
DEMB
HB
HO
HOL
SW
LO
LOL
PGND
PG
CS
VOUT
VCCX
COMP
DBST
CBST
CVCC
RCOMP CCOMP
LOUT
RSENSE
VOUT
COUT
AGND
FB
RT OSC VDDA
RT
CVDDA
Copyright © 2016, Texas Instruments Incorporated
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.




etcTI

LM25141-Q1 Datasheet Preview

LM25141-Q1 Datasheet

Wide Input Range Synchronous Buck Controller

No Preview Available !

LM25141-Q1
SNVSAP9A – MARCH 2017 – REVISED FEBRUARY 2018
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......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 6
6.6 Switching Characteristics .......................................... 9
6.7 Typical Characteristics ............................................ 10
7 Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 14
8 Application and Implementation ........................ 23
8.1 Application Information............................................ 23
8.2 Typical Application ................................................. 23
9 Power Supply Recommendations...................... 35
10 Layout................................................................... 35
10.1 Layout Guidelines ................................................. 35
10.2 Layout Examples................................................... 36
11 Device and Documentation Support ................. 39
11.1 Device Support...................................................... 39
11.2 Documentation Support ........................................ 39
11.3 Receiving Notification of Documentation Updates 40
11.4 Community Resources.......................................... 40
11.5 Trademarks ........................................................... 40
11.6 Electrostatic Discharge Caution ............................ 40
11.7 Glossary ................................................................ 40
12 Mechanical, Packaging, and Orderable
Information ........................................................... 40
4 Revision History
Changes from Original (March 2017) to Revision A
Page
• Added top navigator icon for TI Design reference design ..................................................................................................... 1
• Changed EVM MOSFET part number from: "CDS18534Q5A" to: "CSD18534Q5A" ......................................................... 29
• Changed "+" to "×" in Equation 55 ...................................................................................................................................... 33
2
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Product Folder Links: LM25141-Q1
Copyright © 2017–2018, Texas Instruments Incorporated


Part Number LM25141-Q1
Description Wide Input Range Synchronous Buck Controller
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