TPS54325_15 Datasheet, PDF (1/26 Pages) Texas Instruments – TPS54325 4.5-V to 18-V, 3-A Output Synchronous Step Down Switcher with Integrated FET

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TPS54325
SLVS932F – MAY 2009 – REVISED NOVEMBER 2014
TPS54325 4.5-V to 18-V, 3-A Output Synchronous Step Down
Switcher with Integrated FET
1 Features
•1 D-CAP2™ Mode Enables Fast Transient
Response
• Low Output Ripple and Allows Ceramic Output
Capacitor
• Wide V_CC Input Voltage Range: 4.5 V to 18 V
• Wide V_IN Input Voltage Range: 2.0 V to 18 V
• Output Voltage Range: 0.76 V to 5.5 V
• Highly Efficient Integrated FET’s Optimized for
Lower Duty Cycle Applications – 120 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 Over Current Limit
• Power Good Output
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)
3 Description
The TPS54325 device is an adaptive on-time D-
CAP2™ mode synchronous buck converter. The
TPS54325 device 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 TPS54325 uses the D-
CAP2™ mode control which provides a very fast
transient response with no external components. The
TPS54325 also has a proprietary circuit that enables
the device to adapt 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
VCC input , and from 2.0-V to 18-V VIN input power
supply voltage. The output voltage can be
programmed between 0.76 V and 5.5 V. The device
also features an adjustable slow start time and a
power good function. The TPS54325 is available in
the 14 pin HTSSOP package, and designed to
operate from –40°C to 85°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54325
HTSSOP (14)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
TPS54325
Load Transient Response
V_OUT (50 mV / div)
100 µs / div
I_OUT (2 A / 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.