TPS56428_15 Datasheet, PDF (1/28 Pages) Texas Instruments – TPS56428 4.5-V to 18-V Input, 4-A Sync. Step-Down Converter with Advanced Eco-mode™

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TPS56428
SLVSBV4B – APRIL 2013 – REVISED OCTOBER 2015
TPS56428 4.5-V to 18-V Input, 4-A Sync. Step-Down Converter with Advanced Eco-mode™
1 Features
•1 D-CAP2™ Mode at 650kHz Switching for Fast
Transient Response, Ceramic Capacitor Support
• V_IN Input Voltage Range: 4.5 V to 18 V
• Output Voltage Range: 0.6 V to 7.0 V
• Advanced Eco-mode for High Light Load
Efficiency
• Integrated FETs Optimized for Lower Duty Cycle
– 68 mΩ (High Side) and 37 mΩ (Low Side)
• Shutdown Current Less Than 10 μA
• 1% Initial Reference Voltage Accuracy
• Soft Start with Pre-Bias Output Support
• Cycle By Cycle Over Current Limit
• Power Good Output
• Fixed Soft Start : 1.0ms
2 Applications
• Digital TV, High Definition Video Equipment
• Networking Home Terminal
• Digital Set Top Box (STB)
• Network Controllers
Simplified Schematic
3 Description
The TPS56428 is a D-CAP2 mode synchronous buck
converter which is optimized for various power bus
regulation needs with a cost effective, low component
count, low standby current solution.
The D-CAP2 mode control provides a fast transient
response with no external compensation
components. This adaptive on-time control supports
seamless transition between PWM mode at higher
load conditions and advanced Eco-mode operation at
light loads. Advanced Eco-mode™ maintains higher
efficiency during lighter load conditions than
traditional skip mode.
The TPS56428 also has a proprietary circuit 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 and its output voltage
can be programmed between 0.6V and 7.0V. The
device also features a fixed 1-ms soft start and a
power-good output.
The TPS56428 is available in 8-pin SOIC-8 and 14-
pin QFN packages designed to operate over the
ambient temperature range of –40°C to 85°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS56428
HSOP (8)
VQFN (14)
4.89 mm × 3.9 mm
3.5 mm × 3.5 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
spacer
Light Load Efficiency with Advanced Eco-mode
100
TPS56428
80
60
40
20
0
1
10
I_OUT - Output Current (mA)
Vo = 1.8V
Vo = 5.0V
Vo = 3.3V
100
C009
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.