TPS65262 Datasheet, PDF (1/43 Pages) Texas Instruments – 4.5- to 18-V Input Voltage, 3-A/1-A/1-A Output Current Triple Synchronous Step-Down Converter With Dual Adjustable 200-mA/100-mA LDOs

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TPS65262
SLVSCF9C – JANUARY 2014 – REVISED JULY 2014
TPS65262 4.5- to 18-V Input Voltage, 3-A/1-A/1-A Output Current Triple Synchronous
Step-Down Converter With Dual Adjustable 200-mA/100-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: 200
mA/100 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/Power-Down Sequence
• Pulse Skipping Mode (PSM) at Light Load
• Output Voltage Power Good Indicator
• Thermal Overloading Protection
• 32-Pin VQFN (RHB) 5-mm × 5-mm Package
2 Applications
• DTV
• Set-Top Boxes
• Home Gateway and Access Point Networks
• Wireless Routers
• Surveillance
• POS Machine
3 Description
The TPS65262 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. At light load, the device
automatically operates in PSM, which provides high
efficiency by reducing switching losses.
Two low dropout voltage linear regulators (LDO) are
also built in TPS65262 with input voltage range 1.3 to
18 V, continuous output current 200 mA/100 mA,
independent enable and adjustable output voltage.
The TPS65262 features an automatic power
sequence with driving MODE pin to high and
configuring EN1, EN2, and EN3 pins.
The device features overvoltage protection,
overcurrent and short-circuit protection, and
overtemperature protection. A power good pin asserts
when any output voltages are out of regulation.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65262
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
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
TPS65262
VIN 12 V
VOUT 3.3 V
0.10
1.00
Output Load J A
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.