TPS65262-2 Datasheet, PDF (1/41 Pages) Texas Instruments – Output Current Triple Synchronous Step-Down Converter

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TPS65262-2
SLVSD87A – DECEMBER 2015 – REVISED DECEMBER 2015
TPS65262-2 4.5- to 18-V Input Voltage, 3-A/1-A/1-A Output Current Triple Synchronous
Step-Down Converter With Dual Adjustable 350-mA/150-mA LDOs
1 Features
•1 Operating Input Voltage Range: 4.5 to 18 V
• Feedback Reference Voltage: 0.6 V ±1%
• Maximum Continuous Output Current: 3 A/1 A/1 A
• Fixed 600-kHz Switching Frequency
• Integrated Dual LDOs With Input Voltage Range:
1.3 to 18 V and Continuous Output Current: 350
mA/150 mA
• Programmable Soft Start Time for Buck1
• Fixed 1-ms Soft-Start Time for Buck2 and Buck3
• Internal Loop Compensation for Buck2 and Buck3
• Dedicated Enable Pins for Each Buck
• Support Pulse Skipping Mode (PSM) and Forced
Continuous Current Mode (FCCM)
• Output Voltage Power-Good Indicator
• Thermal Overloading Protection
• 32-Pin VQFN (RHB) 5-mm × 5-mm Package
• Overvoltage Protection, Overcurrent and Short-
Circuit Protection, and Overtemperature
Protection
2 Applications
• DTV
• Set-Top Boxes
• Home Gateway and Access Point Networks
• Wireless Routers
• Surveillance
• POS Machine
3 Description
The TPS65262-2 is a monolithic triple synchronous
step-down (buck) converter with 3-A/1-A/1-A output
current. A wide 4.5- to 18-V input supply voltage
range encompasses the most intermediate bus
voltage operating off 5-, 9-, 12-, or 15-V power bus.
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 at 600-kHz fixed switching frequency. The
loop compensations for buck 2 and buck3 have been
integrated for less external components. The 180°
out-of-phase operation between buck1 and buck2, 3
(buck2 and buck3 run in phase) minimizes the input
filter requirements.
The TPS65262-2 operates in pulse skipping mode
(PSM) with connecting MODE pin to GND and
operates in force continuous current mode (FCC) with
driving MODE pin to high or leaving float. PSM mode
provides high efficiency by reducing switching losses
at light load and FCC mode reduces noise
susceptibility and RF interference.
Two low dropout voltage linear regulators (LDO) are
also built in TPS65262-2 with input voltage range 1.3
to 18 V, continuous output current 350 mA/150 mA,
independent enable and adjustable output voltage.
A power-good pin asserts when any output voltages
are out of regulation.
PART NUMBER
TPS65262-2
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Vin
LDO1
LDO2
1
Application Schematic
VINx
LX1
PGOOD
MODE
FB1
ENx
SS1
LX2
TPS65262-2
LVIN1
LOUT1
FB2
LFB1
LEN1
LVIN2
LX3
LOUT2
LFB2
LEN2
FB3
AGND PGND
Vout1
Vout2
Vout3
Efficiency vs Output Load
100%
80%
60%
40%
20%
V _IN = 5 V; V _OUT = 1.2 V
0
10m
100m
Output Load (A)
PSM Mode
PWM Mode
1
D001
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.