TPS65262-1_15 Datasheet, PDF (1/43 Pages) Texas Instruments – TPS65262-1, 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

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TPS65262-1
SLVSCN5A – JUNE 2014 – REVISED OCTOBER 2014
TPS65262-1, 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 5.5 V
– 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
• Automatic Power-Up and Power-Down Sequence
• Pulse Skipping Mode (PSM) at Light Load
• Output Voltage Power-Good Indicator
• Thermal Overloading Protection
2 Applications
• DTV
• Set-Top Boxes
• Home Gateway and Access Point Networks
• Wireless Routers
• Surveillance
• POS Machine
3 Description
The TPS65262-1 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-V, 9-V, 12-V, 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,
buck3 (buck2 and buck3 run in phase) minimizes the
input filter requirements. At light load, the device
automatically operates in pulse skipping mode (PSM)
which provides high efficiency by reducing switching
losses.
Two low dropout voltage linear regulators (LDOs) are
built in TPS65262-1 with input voltage range of 1.3 to
5.5 V, continuous output current 350/150 mA,
independent enable, and adjustable output voltage.
The TPS65262-1 features an automatic power
sequence with driving MODE pin to high and
configuring EN1, EN2, and EN3 pins.
The device features protection for overvoltage,
overcurrent, short-circuit, and overtemperature. A
power good pin asserts when any buck output
voltages are out of regulation.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65262-1
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
LDO1
LDO2
VINx
LX1
PGOOD
MODE
FB1
ENx
SS1
LX2
TPS65262-1
LVIN1
LOUT1
FB2
LFB1
LEN1
LVIN2
LX3
LOUT2
LFB2
LEN2
FB3
AGND PGND
1
Vout1
Vout2
Vout3
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.01
Efficiency vs Output Load
0.10
Output Load (A)
VIN = 12 V
VOUT = 3.3 V
1.00
C001
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.