TPS54328_16 Datasheet, PDF (1/29 Pages) Texas Instruments – TPS54328 4.5-V to 18-V Input, 3-A Synchronous Step-Down Converter With Eco-Mode

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TPS54328
SLVSAN2D – NOVEMBER 2010 – REVISED AUGUST 2016
TPS54328 4.5-V to 18-V Input, 3-A Synchronous Step-Down Converter With Eco-Mode™
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 7 V
• Highly Efficient Integrated FETs Optimized for
Lower Duty Cycle Applications
– 100 mΩ (High-Side) and 70 mΩ (Low-Side)
• High Efficiency, Less Than 10 µA at Shutdown
• High Initial Bandgap Reference Accuracy
• Adjustable Soft Start
• Pre-Biased Soft Start
• 700-kHz Switching Frequency (f_SW)
• Cycle-By-Cycle Overcurrent Limit
• Auto-Skip Eco-Mode™ for High Efficiency at Light
Load
2 Applications
• Wide Range of Applications for Low Voltage
Systems
– Digital TV Power Supplies
– High Definition Blu-ray Disc™ Players
– Networking Home Terminals
– Digital Set Top Boxes (STB)
3 Description
The TPS54328 is an adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54328
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
TPS54328 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 TPS54328 to maintain high
efficiency during lighter load conditions. The
TPS54328 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
input (V_IN).
The output voltage can be programmed from 0.76 V
to 7 V. The device also features an adjustable soft
start time. The TPS54328 is available in 8-pin DDA
and 10-pin DRC packages, and is designed to
operate over the ambient temperature range of –40°C
to 85°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54328
HSOP (8)
VSON (10)
4.89 mm × 3.90 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
TPS54320 Transient Response
V_O = 50 mV / div (-950 mV dc offset)
I_O = 1 A / div (0.75 to 2.25 A load step,
slew rate = 1 A / µsec)
Copyright © 2016, Texas Instruments Incorporated
Time = 50 µsec / 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.