TPS56628 Datasheet, PDF (1/23 Pages) Texas Instruments – 4.5V to 18V Input, 6-A Synchronous Step-Down Converter with Eco-mode

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TPS56628
SLVSC94 – OCTOBER 2013
4.5V to 18V Input, 6-A Synchronous Step-Down Converter with Eco-mode™
Check for Samples: TPS56628
FEATURES
1
•23 D-CAP2™ Mode Enables Fast Transient
Response
• Low Output Ripple and Allows Ceramic Output
Capacitor
• Wide V_IN 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 (f_SW)
• 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
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)
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 device
also features an adjustable soft start time. The
TPS56628 is available in the 8-pin DDA package,
and designed to operate from –40°C to 85°C.
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.
2
Blu-ray Disc is a trademark of Blu-ray Disc Association.
3
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