TPS65265 Datasheet, PDF (1/47 Pages) Texas Instruments – Output Current Triple Synchronous Step-Down Converter

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TPS65265
SLVSD86A – DECEMBER 2015 – REVISED DECEMBER 2015
TPS65265 4.5-V to 17-V Input Voltage, 5-A/3-A/2-A Output Current Triple Synchronous
Step-Down Converter
1 Features
•1 Operating Input Voltage Range 4.5 V to 17 V
• Feedback Reference Voltage 0.6 V ±1.33%
• Continuous Output Current 5 A/3 A/2 A
• Adjustable Clock Frequency from 250 kHz to
2.3 MHz
• External Synchronization Oscillator
• 120° Out of Phase for Buck1, Buck2, Buck3
• Dedicated Enable Pins for Each Buck
• Fixed SS Time for Each Buck (2.4 ms)
• Automatic Power-Up/Power-Down Sequence and
Adjustable Interval Time Between Bucks (6
Combinations)
• Support Pulse Skipping Mode (PSM) and Forced
Continuous Current Mode (FCCM)
• Output Voltage Power Good Indicator and
Adjustable Delay Time
• Thermal Overloading Protection
• 32-Pin QFN (RHB) 5-mm × 5-mm Package
2 Applications
• DTV
• Set-Top Boxes/OTT
• Home Gateway and Access Point Networks
• Surveillance
3 Description
The TPS65265 incorporates triple synchronous buck
converters with 4.5-V to 17-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 switching
frequency of the converters can be adjustable from
250 kHz to 2.3 MHz with an external resistor or
external clock. 120° out-of-phase operation between
Buck1, Buck2, and Buck3 minimizes the input filter
requirements.
The TPS65265 operates in pulse skipping mode
(PSM) with driving MODE pin to high or leaving float
and operates in force continuous current mode (FCC)
with connecting MODE pin to GND. PSM mode
provides high efficiency by reducing switching losses
at light load and FCC mode reduces noise
susceptibility and RF interference.
The TPS65265 is available in a 32-pin thermal
enhanced QFN (RHB) 5-mm × 5-mm thin package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65265
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
SPACE
Simplified Application Circuit
Vin
PVINx
LX1
TPS65265
FB1
MODE
PSM
LX2
PG_DLY
SEQ_DLY
ENx
FB2
PGOOD
ROSC
LX3
AGND
FB3
PGND
VOUT1
VOUT2
VOUT3
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0
0.01
Efficiency vs Output Load
PSM Mode, V_OUT = 1.2 V
PWM Mode, V_OUT = 1.2 V
0.1
1
5
Output Current (A)
D100
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.