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LM3489-Q1 Datasheet Preview

LM3489-Q1 Datasheet

Hysteretic PFET Buck Controller

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LM3489, LM3489-Q1
SNVS443C – MAY 2006 – REVISED DECEMBER 2016
LM3489x Hysteretic PFET Buck Controller With Enable Pin
1 Features
1 Qualified for Automotive Parts
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C5
• Easy-to-Use Control Methodology
• No Control Loop Compensation Required
• Wide 4.5-V to 35-V Input Range
• 1.239 V to VIN Adjustable Output Range
• High Efficiency: 93%
• ±1.3% (±2% Over Temperature) Internal
Reference
• 100% Duty Cycle Operation
• Maximum Operation Frequency > 1 MHz
• Current Limit Protection
• Dedicated Enable Pin (on if Unconnected)
• Shutdown Mode Draws Only 7-µA Supply Current
• 8-Pin VSSOP Package
2 Applications
• Set-Top Boxes
• DSL or Cable Modems
• PC/IA
• Auto PCs
• TFT Monitors
• Battery-Powered Portable Applications
• Distributed Power Systems
• Always-On Power
• High-Power LED Drivers
• Automotive
3 Description
The LM3489 device is a high-efficiency PFET
switching regulator controller that can be used to
quickly and easily develop a small, cost-effective,
switching buck regulator for a wide range of
applications. The hysteretic control architecture
provides for simple design without any control loop
stability concerns using a wide variety of external
components. The PFET architecture also allows for
low component count as well as ultra-low dropout,
100% duty cycle operation. Another benefit is high
efficiency operation at light loads without an increase
in output ripple. A dedicated enable pin provides a
shutdown mode drawing only 7 µA. Leaving the
enable pin unconnected defaults to on.
Current limit protection can be implemented by
measuring the voltage across the PFET’s RDS(ON),
thus eliminating the need for a sense resistor. A
sense resistor may be used to improve current limit
accuracy if desired. The cycle-by-cycle current limit
can be adjusted with a single resistor, ensuring safe
operation over a range of output currents.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3489
LM3489-Q1
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
VIN CADJ RADJ
Q1
L
V OUT
+
CIN1
CIN2
7
PGATE
1
ISENSE
5
ADJ
8 VIN
3 EN
LM3489
PGND
4
FB
2
GND
6
RIS
D1
Cff
R1
+
C OUT
R2
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

LM3489-Q1 Datasheet Preview

LM3489-Q1 Datasheet

Hysteretic PFET Buck Controller

No Preview Available !

LM3489, LM3489-Q1
SNVS443C – MAY 2006 – REVISED DECEMBER 2016
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 ESD Ratings: LM3489 .............................................. 4
6.3 ESD Ratings: LM3489-Q1 ........................................ 4
6.4 Recommended Operating Conditions....................... 4
6.5 Thermal Information .................................................. 5
6.6 Electrical Characteristics........................................... 5
6.7 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................... 9
7.4 Device Functional Mode ......................................... 14
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Application .................................................. 15
9 Power Supply Recommendations...................... 19
10 Layout................................................................... 19
10.1 Layout Guidelines ................................................. 19
10.2 Layout Examples................................................... 19
11 Device and Documentation Support ................. 20
11.1 Related Links ........................................................ 20
11.2 Receiving Notification of Documentation Updates 20
11.3 Community Resources.......................................... 20
11.4 Trademarks ........................................................... 20
11.5 Electrostatic Discharge Caution ............................ 20
11.6 Glossary ................................................................ 20
12 Mechanical, Packaging, and Orderable
Information ........................................................... 20
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (February 2013) to Revision C
Page
• Added ESD Ratings 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
• Added AEC-Q100 Qualification bullets to Features ............................................................................................................... 1
• Deleted Lead temperature (Vapor phase and Infrared maximums) ....................................................................................... 4
• Added Thermal Information table ........................................................................................................................................... 5
Changes from Revision A (February 2013) to Revision B
Page
• Changed layout of National Semiconductor Data Sheet to TI format .................................................................................... 1
2 Submit Documentation Feedback
Copyright © 2006–2016, Texas Instruments Incorporated
Product Folder Links: LM3489 LM3489-Q1


Part Number LM3489-Q1
Description Hysteretic PFET Buck Controller
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