TPS65263_15 Datasheet, PDF (1/46 Pages) Texas Instruments – TPS65263, 4.5- to 18-V Input Voltage, 3-A/2-A/2-A Output Current Triple Synchronous Step-Down Converter With I2C Controlled Dynamic Voltage Scaling

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TPS65263
SLVSCN0A – JUNE 2014 – REVISED SEPTEMBER 2014
TPS65263, 4.5- to 18-V Input Voltage, 3-A/2-A/2-A Output Current Triple Synchronous
Step-Down Converter With I²C Controlled Dynamic Voltage Scaling
1 Features
•1 Operating Input Voltage Range 4.5- to 18-V
Continuous Output Current 3 A/2 A/2 A
• I²C Controlled 7-Bits VID Programmable Output
Voltage from 0.68 to 1.95 V With 10-mV Voltage
Step for Each Buck
• I²C Controlled VID Voltage Transition Slew Rate
• I²C Read Back Power Good Status, Overcurrent
Warning for Each Buck
• I²C Read Back Die Temperature Warning
• I²C Compatible Interface With Standard Mode
(100 kHz) and Fast Mode (400 kHz)
• Feedback Reference Voltage 0.6 V ±1%
• Fixed 600-kHz Frequency
• Dedicated Enable and Soft Start Pins for Each
Buck
• Thermal Overloading Protection
2 Applications
• DTV LCD Panel
• Set-Top Boxes
• Home Gateway and Access Point Networks
• Surveillance
3 Description
The TPS65263 incorporates triple synchronous buck
converters with 4.5- to 18-V wide input voltage range
that encompassed most intermediate bus voltage
operating off 5-, 9-, 12-, or 15-V power bus or battery.
The converter, with constant frequency peak current
mode, is designed to simplify its application while
giving designers options to optimize the system
according to targeted applications. The device
operates in 600 kHz with 180° out-of-phase between
buck1 and buck2, buck3 (buck2 and buck3 run in
phase).
The initial startup voltage of each buck can be set
with external feedback resistors. The output voltage
of each buck can be dynamically scaled from 0.68 to
1.95 V in 10-mV step with I²C controlled 7 bits VID.
The VID voltage transition slew rate is programmable
with 3-bits control through I²C bus to optimize
overshoot/undershoot during VID voltage transition.
Each buck in TPS65263 can be I²C controlled for
enabling/disabling output voltage, setting the pulse
skipping mode (PSM) or force continuous current
mode (FCC) at light load condition and reading the
power good status, overcurrent warning and die
temperature warning.
The TPS65263 features overvoltage, overcurrent,
short-circuit, and overtemperature protection.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65263
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Typical Application
Vin
DVCC
PVINx
LX1
VIN
TPS65263
Vout1
Vout2
Vout3
VOUT1
VOUT2
VOUT3
FB1
LX2
ENx
SSx
FB2
SDA
SCL
SDA
SCL
AGND
LX3
FB3
PGND
Vout1
Vout2
Vout3
Efficiency vs Output Load
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.01
0.10
1.00
Output Load (A)
C001
A. V_IN = 12 V; V_OUT = 3.3 V
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.