Step-Down Converter. TPS54527 Datasheet

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TPS54527
SLVSAY5D – JULY 2011 – REVISED AUGUST 2016
TPS54527 4.5-V to 18-V Input, 5-A Synchronous Step-Down Converter
1 Features
1 D-CAP2™ Mode Enables Fast Transient
Response
• Low Output Ripple and Allows Ceramic Output
Capacitor
• Wide Input Voltage Range: 4.5 V to 18 V
• Output Voltage Range: 0.76 V to 6 V
• Highly Efficient Integrated FETs Optimized for
Lower Duty Cycle Applications: 65 mΩ (High Side)
and 36 mΩ (Low Side)
• High Efficiency: Less Than 10 µA at Shutdown
• High Initial Bandgap Reference Accuracy
• Adjustable Soft Start
• Prebiased Soft Start
• 650-kHz Switching Frequency
• Cycle-by-Cycle Overcurrent Limit
2 Applications
• Wide Range of Applications for Low Voltage
System
– Digital TV Power Supply
– High Definition Blu-ray Disc™ Players
– Networking Home Terminal
– Digital Set Top Box (STB)
Simplified Schematic
3 Description
The TPS54527 is an adaptive on-time D-CAP2 mode
synchronous buck converter. The TPS54527 enables
system designers to complete the suite of various
end equipment’s power bus regulators with a cost
effective, low component count, low standby current
solution. The main control loop for the TPS54527
uses the D-CAP2 mode control which provides a fast
transient response with no external compensation
components. The TPS54527 also has a proprietary
circuit that enables the device to adopt to both low
equivalent series resistance (ESR) output capacitors,
such as POSCAP or SP-CAP, and ultra-low ESR
ceramic capacitors. The device operates from a 4.5-V
to 18-V input. The output voltage can be programmed
from 0.76 V to 6 V. The device also features an
adjustable soft-start time. The TPS54527 is available
in the 8-pin DDA package, and designed to operate
from –40°C to 85°C.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54527
SO PowerPAD (8) 4.89 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Load Transient Response
TPS54527
Vout (50 mV/div)
Iout (2 A/div)
Copyright © 2016, Texas Instruments Incorporated
t - Time - 100 ms/div
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.


TPS54527 Datasheet
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Part TPS54527
Description 5-A Synchronous Step-Down Converter
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etcTI TPS54527
TPS54527
SLVSAY5D – JULY 2011 – REVISED AUGUST 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......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Timing Requirements ................................................ 5
6.7 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes.......................................... 9
8 Application and Implementation ........................ 11
8.1 Application Information............................................ 11
8.2 Typical Application .................................................. 11
9 Power Supply Recommendations...................... 14
10 Layout................................................................... 14
10.1 Layout Guidelines ................................................. 14
10.2 Layout Example .................................................... 15
10.3 Thermal Consideration.......................................... 15
11 Device and Documentation Support ................. 16
11.1 Documentation Support ........................................ 16
11.2 Receiving Notification of Documentation Updates 16
11.3 Community Resources.......................................... 16
11.4 Trademarks ........................................................... 16
11.5 Electrostatic Discharge Caution ............................ 16
11.6 Glossary ................................................................ 16
12 Mechanical, Packaging, and Orderable
Information ........................................................... 16
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (May 2012) to Revision D
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
• Deleted Ordering Information table; see POA at the end of the data sheet........................................................................... 1
Changes from Revision B (January 2012) to Revision C
Page
• Changed tOFF(MIN) From: 310 ns To: 330 ns............................................................................................................................ 5
Changes from Revision A (November 2011) to Revision B
Page
• Changed equation 1 denominator from 2 to 6........................................................................................................................ 8
Changes from Original (July 2011) to Revision A
Page
• Changed pinout drawing to correct pins 5, 6, 7, 8 location .................................................................................................... 3
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Copyright © 2011–2016, Texas Instruments Incorporated



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5 Pin Configuration and Functions
DDA Package
8-Pin SO PowerPAD
Top View
TPS54527
SLVSAY5D – JULY 2011 – REVISED AUGUST 2016
EN
VFB
VREG5
SS
18
27
Thermal Pad
36
45
VIN
VBST
SW
GND
PIN
NAME
NO.
EN 1
VFB 2
VREG5
3
SS 4
GND
5
SW 6
VBST
7
VIN
Thermal
Pad
8
Back
side
Not to scale
Pin Functions
I/O DESCRIPTION
I Enable input control. EN is active high and must be pulled up to enable the device.
I Converter feedback input. Connect to output voltage with feedback resistor divider.
O
5.5-V power supply output. A capacitor (typically 1 µF) must be connected to GND. VREG5 is not active
when EN is low.
I Soft-start control. An external capacitor must be connected to GND.
Ground pin. Power ground return for switching circuit. Connect sensitive SS and VFB returns to GND at a
single point.
O Switch node connection between high-side NFET and low-side NFET.
O
Supply input for the high-side FET gate drive circuit. Connect 0.1-µF capacitor between VBST and SW pins.
An internal diode is connected between VREG5 and VBST.
I Input voltage supply pin.
Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Must be connected to
GND.
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
MIN
MAX
UNIT
VIN, EN
–0.3 20
VBST
–0.3 26
VBST (10-ns transient)
–0.3 28
Input voltage
VBST (vs SW)
–0.3 6.5
V
VFB, SS
–0.3 6.5
SW –2 20
SW (10-ns transient)
–3 22
Output voltage
VREG5
GND
–0.3 6.5
–0.3 0.3
V
Voltage from GND to thermal pad, Vdiff
Operating junction temperature, TJ
Storage temperature, Tstg
–0.2 0.2
–40 150
–55 150
V
°C
°C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Copyright © 2011–2016, Texas Instruments Incorporated
Product Folder Links: TPS54527
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