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TPS56628
SLVSC94A – OCTOBER 2013 – REVISED DECEMBER 2013
4.5V to 18V Input, 6-A Synchronous Step-Down Converter with Eco-mode™
Check for Samples: TPS56628
FEATURES
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•23 D-CAP2™ Mode Enables Fast Transient Response
• Low Output Ripple and Allows Ceramic Output Capacitor
• Wide VIN Input Voltage Range: 4.5 V to 18 V • Output Voltage Range: 0.76 V to 5.5 V • Highly Efficient Integrated FETs Optimized
for Lower Duty Cycle Applications – 36 mΩ (High Side) and 28 mΩ (Low Side) • High Efficiency, less than 10 μA at shutdown • High Initial Bandgap Reference Accuracy • Pre-Biased Soft Start • 650-kHz Switching Frequency (fSW) • Cycle By Cycle Over Current Limit • Auto-Skip Eco-mode™ for High Efficiency at Light Load • Power Good Output • Fixed Soft Start: 1.0 ms
DESCRIPTION
The TPS56628 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS56628 enables system designers to complete the suite of various end-equipment power bus regulators with a cost effective, low component count, low standby current solution. The main control loop for the TPS56628 uses the D-CAP2™ mode control that provides a fast transient response with no external compensation components. The adaptive on-time control supports seamless transition between PWM mode at higher load conditions and Eco-mode™ operation at light loads. Eco-mode™ allows the TPS56628 to maintain high efficiency during lighter load conditions. The TPS56628 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 4.5-V to 18-V VIN input. The output voltage can be programmed between 0.76 V and 5.5 V. The TPS56628 is available in the 8-pin DDA package, and designed to operate from –40°C to 85°C.
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)
VIN
VOUT
TPS56628DDA
EN 1 EN
8 VIN
2 VFB
7 VBST
3 VREG5
6 SW
4 PG
5 GND
PwPd 9
VOUT
Vout (50mV/div)
Iout (2A/div) 100 μs/div
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. D-CAP2, Eco-mode are trademarks of Texas Instruments.
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Blu-ray Disc is a trademark of Blu-ray Disc Association.
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PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated
TPS56628
SLVSC94A – OCTOBER 2013 – REVISED DECEMBER 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
TA –40°C to 85°C
ORDERING INFORMATION(1)(2)(3)
PACKAGE
ORDERABLE PART NUMBER
DDA
TPS56628DDA TPS56628DDAR
PIN 8
TRANSPORT MEDIA
Tube
Tape and Reel
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. (3) All package options have Cu NIPDAU lead/ball finish.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted) (1)
VALUE MIN MAX
UNIT
VIN, EN
–0.3 20
VBST
–0.3 26
VBST (10 ns transient)
–0.3 28
Input voltage range
VBST (vs SW)
–0.3 6.5 V
VFB, PG
–0.3 6.5
SW –2 20
SW (10 ns transient)
–3 22
Output voltage range
VREG5
–0.3 6.5 V
Voltage from GND to thermal pad, Vdiff
Electrostatic discharge
Human Body Model (HBM) Charged Device Model (CDM)
–0.2 0.2 V 2 kV
500 V
Operating junction temperature, TJ Storage temperature, Tstg
–40 150 °C
–55 150
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
THERMAL INFORMATION
THERMAL METRIC
θJA θJCtop θJB ψJT ψJB θJCbot
Junction-to-ambient thermal resistance Junction-to-case (top) thermal resistance Junction-to-board thermal resistance Junction-to-top characterization parameter Junction-to-board characterization parameter Junction-to-case (bottom) thermal resistance
TPS56628 DDA (8 PINS)
43.5 49.4 25.6 7.4 25.5 5.2
UNITS °C/W
2 Copyright © 2013, Texas Ins.