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SM72485 Datasheet

Constant On-Time Buck Switching Regulator

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SM72485
SNVS697E – JANUARY 2011 – REVISED DECEMBER 2016
SM72485 100-V, 150-mA Constant On-Time Buck Switching Regulator
1 Features
1 Operating Input Voltage: 6 V to 95 V
• Integrated 100-V, N-Channel Buck Switch
• Internal Start-Up Regulator
• No Loop Compensation Required
• Ultra-Fast Transient Response
• On-time Varies Inversely With Input Voltage
• Operating Frequency Remains Constant With
Varying Line Voltage and Load Current
• Adjustable Output Voltage From 2.5 V
• Highly Efficient Operation
• Precision Internal Reference
• Low Bias Current
• Intelligent Current Limit
• Thermal Shutdown
• Package
– VSSOP (3 mm × 3 mm)
– WSON (4 mm × 4 mm)
2 Applications
• PV Panel Smart Junction Boxes
• Nonisolated Telecommunication Buck Regulator
• Secondary High Voltage Post Regulator
• 42-V Automotive Systems
3 Description
The SM72485 step-down switching regulator features
all of the functions required to implement a low cost,
efficient, Buck bias regulator. This high voltage
regulator contains an 100-V N-channel buck switch.
The device is easy to implement and is provided in
the VSSOP and the thermally enhanced WSON
package. The regulator is based on a control scheme
using an on-time inversely proportional to VIN. This
feature allows the operating frequency to remain
relatively constant. The control scheme requires no
loop compensation. An intelligent current limit is
implemented with forced off-time, which is inversely
proportional to VOUT. This scheme ensures short
circuit control while providing minimum foldback.
Other features include: Thermal shutdown, VCC
undervoltage lockout, gate drive undervoltage
lockout, maximum duty cycle limiter, and a precharge
switch.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SM72485
VSSOP (8)
WSON (8)
3.00 mm × 3.00 mm
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application, Basic Step-Down Regulator
6V - 95V
Input
VIN
C1
RT
GND
SHUTDOWN
RCL
VIN
SM72485
RT/SD
RCL
VCC
BST
SW
C3
C4
L1
D1
RFB2
VOUT
R3
RTN
FB
C2
RFB1
GND
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

SM72485 Datasheet Preview

SM72485 Datasheet

Constant On-Time Buck Switching Regulator

No Preview Available !

SM72485
SNVS697E – JANUARY 2011 – 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.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 7
7.1 Overview ................................................................... 7
7.2 Functional Block Diagram ......................................... 7
7.3 Feature Description................................................... 7
7.4 Device Functional Modes.......................................... 9
8 Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Application .................................................. 12
9 Power Supply Recommendations...................... 17
10 Layout................................................................... 18
10.1 Layout Guidelines ................................................. 18
10.2 Layout Example .................................................... 18
11 Device and Documentation Support ................. 19
11.1 Documentation Support ........................................ 19
11.2 Receiving Notification of Documentation Updates 19
11.3 Community Resources.......................................... 19
11.4 Trademarks ........................................................... 19
11.5 Electrostatic Discharge Caution ............................ 19
11.6 Glossary ................................................................ 19
12 Mechanical, Packaging, and Orderable
Information ........................................................... 19
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (April 2013) to Revision E
Page
• Added Device Information table, Pin Configuration and Functions section, ESD Ratings table, Thermal Information
table, Detailed Description section, Application and Implementation section, Power Supply Recommendations
section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable
Information section ................................................................................................................................................................. 1
• Deleted Renewable Energy Grade from Features ................................................................................................................. 1
• Deleted Lead temperature (260°C maximum) from Absolute Maximum Ratings table.......................................................... 4
• Changed Junction to Ambient, RθJA, value in Thermal Information table From: 200°C/W To: 139.6°C/W (VSSOP)
and From: 40°C/W To: 42.3°C/W (WSON) ............................................................................................................................ 4
Changes from Revision C (April 2013) to Revision D
Page
• Changed layout of National Seminconductor Data Sheet to TI format .................................................................................. 1
2
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Copyright © 2011–2016, Texas Instruments Incorporated



Part Number SM72485
Description Constant On-Time Buck Switching Regulator
Maker etcTI
Total Page 3 Pages
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