TPS54227_15 Datasheet, PDF (1/24 Pages) Texas Instruments – Synchronous Step-Down Converter

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TPS54227
SLVSAU2C – MAY 2011 – REVISED DECEMBER 2015
TPS54227 4.5-V to 18-V Input, 2-A Synchronous Step-Down Converter
1 Features
•1 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 7 V
• Highly-Efficient Integrated FETs Optimized
for Lower Duty Cycle Applications
– 155 mΩ (High-Side) and 108 mΩ (Low-Side)
• High Efficiency, Less Than 10 μA at Shutdown
• High Initial Bandgap Reference Accuracy
• Adjustable Soft-Start
• Prebiased Soft-Start
• 700-kHz Switching Frequency (f_SW)
• Cycle-By-Cycle Overcurrent Limit
3 Description
The TPS54227 device is an adaptive ON-time D-
CAP2 mode synchronous buck converter. The
TPS54227 enables system designers to complete the
bus regulators for a suite of various end equipment
with a cost-effective, low component count, low
standby current solution. The main control loop for
the TPS54227 uses the D-CAP2 mode control which
provides a fast transient response with no external
compensation components. The TPS54227 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 7 V. The device
also features an adjustable soft-start time. The
TPS54227 is available in the 8-pin HSOP package
and 10-pin VSON, and is designed to operate from
–40°C to 85°C.
2 Applications
• Wide Range of Applications for Low-Voltage
System
– Digital TV Power Supply
– High-Definition Blu-ray Disc™ Players
– Networking Home Terminals
– Digital Set Top Boxes (STB)
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54227
SO PowerPAD (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
TPS54227 Transient Response
TPS54227DDA
Vout (50 mV/div)
Iout (1 A/div)
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.