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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
3 Description
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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.
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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
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DTV
Set-Top Boxes
Home Gateway and Access Point Networks
Wireless Routers
Surveillance
POS Machine
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
TPS65262-1
PACKAGE
VQFN (32)
BODY SIZE (NOM)
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
Efficiency vs Output Load
Vin
100%
Vout1
VINx
LX1
90%
80%
PGOOD
FB1
ENx
70%
Vout2
SS1
LX2
TPS65262-1
LDO1
LDO2
LVIN1
LOUT1
LFB1
LEN1
FB2
60%
50%
40%
30%
Vout3
LX3
LVIN2
LOUT2
LFB2
LEN2
20%
VIN = 12 V
VOUT = 3.3 V
10%
FB3
AGND
Efficiency (%)
MODE
PGND
0%
0.01
0.10
Output Load (A)
1.00
C001
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.
TPS65262-1
SLVSCN5A – JUNE 2014 – REVISED OCTOBER 2014
www.ti.com
Table of Contents
1
2
3
4
5
6
7
8
9
Features ..................................................................
Applications ...........................................................
Description .............................................................
Typical Application ................................................
Revision History.....................................................
Device Comparison Table.....................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
1
2
3
4
6
8.1
8.2
8.3
8.4
8.5
8.6
6
6
6
6
7
9
Absolute Maximum Ratings ......................................
Handling Ratings.......................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Typical Characteristics ..............................................
Detailed Description ............................................ 13
9.1 Overview ................................................................. 13
9.2 Functional Block Diagram ....................................... 14
9.3 Feature Description................................................. 14
9.4 Device Functional Modes........................................ 21
10 Application and Implementation........................ 23
10.1 Application Information.......................................... 23
10.2 Typical Application ............................................... 23
11 Power Supply Recommendations ..................... 33
12 Layout................................................................... 33
12.1 Layout Guidelines ................................................. 33
12.2 Layout Example .................................................... 34
13 Device and Documentation Support ................. 35
13.1 Trademarks ........................................................... 35
13.2 Electrostatic Discharge Caution ............................ 35
13.3 Glossary ................................................................ 35
14 Mechanical, Packaging, and Orderable
Information ........................................................... 35
5 Revision History
Changes from Original (June 2014) to Revision A
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2
Page
Changed device status to production data ............................................................................................................................ 1
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Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: TPS65262-1
TPS65262-1
www.ti.com
SLVSCN5A – JUNE 2014 – REVISED OCTOBER 2014
6 Device Comparison Table
PART
NUMBER
DESCRIPTION
COMMENTS
TPS65261/-1
4.5 to 18 V, triple buck with
input voltage power failure
indicator
Triple buck 3-A/2-A/2-A output current, features an open-drain RESET signal to monitor
input power failure, automatic power sequencing
TPS65262
4.5 to 18 V, triple buck with
dual adjustable LDOs
Triple buck 3-A/1-A/1-A output current, automatic power sequencing. Dual LDOs 200
mA/100 mA
TPS65263
4.5 to 18 V, triple buck with
I2C interface
Triple buck 3-A/2-A/2-A output current, I2C controlled dynamic voltage scaling (DVS)
TPS65287
4.5 to 18 V, triple buck with
power switch and push button
control
Triple buck 3-A/2-A/2-A output current, up to 2.1-A USB power with overcurrent setting by
external resistor, push-button control for intelligent system power-on and power-off
operation
TPS65288
4.5 to 18 V, triple buck with
dual power switches
Triple buck 3-A/2-A/2-A output current, two USB power switches current limiting at typical
1.2 A (0.8, 1.0, 1.4, 1.6, 1.8, 2.0, and 2.2 A available with manufacture trim options)
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Product Folder Links: TPS65262-1
3
TPS65262-1
SLVSCN5A – JUNE 2014 – REVISED OCTOBER 2014
www.ti.com
7 Pin Configuration and Functions
EN1
FB1
SS1
COMP1
V7V
AGND
FB3
EN3
RHB Package
32 Pins
(Top View)
24
23
22
21
20
19
18
17
BST1
25
16
BST3
LX1
26
15
LX3
PGND1
27
14
PGND3
VIN1
28
13
VIN3
Thermal Pad
PGND2
LOUT1
31
10
LX2
LVIN1
32
9
2
3
4
LEN2
1
5
6
7
8
EN2
11
FB2
30
MODE
LFB1
PGOOD
VIN2
LFB2
12
LOUT2
29
LVIN2
LEN1
BST2
(There is no electric signal down bonded to thermal pad inside IC. Exposed thermal pad must be soldered to PCB for
optimal thermal performance.)
Pin Functions
PIN
NAME
DESCRIPTION
NO.
LVIN2
1
Input power supply for LDO2. Connect LVIN2 pin as close as possible to the (+) terminal of an input ceramic capacitor
(suggest 1 µF).
LOUT2
2
LDO2 output. Connect LOUT2 pin as close as possible to the (+) terminal of an output ceramic capacitor (suggest
1 µF).
LFB2
3
Feedback Kelvin sensing pin for LDO2 output voltage. Connect this pin to LDO2 resistor divider.
LEN2
4
Enable for LDO2. Float to enable.
PGOOD
5
An open-drain output, asserts low if the output voltage of any buck is beyond regulation range due to thermal shutdown,
overcurrent, undervoltage, or ENx shut down.
MODE
6
When high, an automatic power-up or power-down sequence is provided according to the states of EN1, EN2, and EN3
pins.
FB2
7
Feedback Kelvin sensing pin for buck2 output voltage. Connect this pin to buck2 resistor divider.
EN2
8
Enable for buck2. Float to enable. Can use this pin to adjust the input undervoltage lockout of buck2 with a resistor
divider.
BST2
9
Boot-strapped supply to the high-side floating gate driver in buck2. Connect a capacitor (recommend 47 nF) from BST2
pin to LX2 pin.
LX2
10
Switching node connection to the inductor and bootstrap capacitor for buck2. The voltage swing at this pin is from a
diode voltage below the ground up to VIN2 voltage.
4
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Product Folder Links: TPS65262-1
TPS65262-1
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SLVSCN5A – JUNE 2014 – REVISED OCTOBER 2014
Pin Functions (continued)
PIN
NAME
DESCRIPTION
NO.
PGND2
11
Power ground connection of buck2. Connect PGND2 pin as close as possible to the (–) terminal of VIN2 input ceramic
capacitor.
VIN2
12
Input power supply for buck2. Connect VIN2 pin as close as possible to the (+) terminal of an input ceramic capacitor
(suggest 10 µF).
VIN3
13
Input power supply for buck3. Connect VIN3 pin as close as possible to the (+) terminal of an input ceramic capacitor
(suggest 10 µF).
PGND3
14
Power ground connection of buck3. Connect PGND3 pin as close as possible to the (–) terminal of VIN3 input ceramic
capacitor.
LX3
15
Switching node connection to the inductor and bootstrap capacitor for buck3. The voltage swing at this pin is from a
diode voltage below the ground up to VIN3 voltage.
BST3
16
Boot-strapped supply to the high-side floating gate driver in buck3. Connect a capacitor (recommend 47 nF) from BST3
pin to LX3 pin.
EN3
17
Enable for buck3. Float to enable. Can use this pin to adjust the input undervoltage lockout of buck3 with a resistor
divider.
FB3
18
Feedback Kelvin sensing pin for buck3 output voltage. Connect this pin to buck3 resistor divider.
AGND
19
Analog ground common to buck controllers and other analog circuits. It must be routed separately from high-current
power grounds to the (–) terminal of the bypass capacitor of input voltage VIN.
V7V
20
Internal LDO for gate driver and internal controller. Connect a 1-µF capacitor from the pin to power ground.
COMP1
21
Error amplifier output and loop compensation pin for buck1. Connect a series resistor and capacitor to compensate the
control loop of buck1 with peak current PWM mode.
SS1
22
Soft-start and tracking input for buck1. An internal 5-µA pullup current source is connected to this pin. The soft-start
time can be programmed by connecting a capacitor between this pin and ground.
FB1
23
Feedback Kelvin sensing pin for buck1 output voltage. Connect this pin to buck1 resistor divider.
EN1
24
Enable for buck1. Float to enable. Can use this pin to adjust the input undervoltage lockout of buck1 with a resistor
divider.
BST1
25
Boot-strapped supply to the high side floating gate driver in buck1. Connect a capacitor (recommend 47 nF) from BST1
pin to LX1 pin.
LX1
26
Switching node connection to the inductor and bootstrap capacitor for buck1. The voltage swing at this pin is from a
diode voltage below the ground up to VIN1 voltage.
PGND1
27
Power ground connection of Buck1. Connect PGND1 pin as close as possible to the (–) terminal of VIN1 input ceramic
capacitor.
VIN1
28
Input power supply for buck1. Connect VIN1 pin as close as possible to the (+) terminal of an input ceramic capacitor
(suggest 10 µF).
LEN1
29
Enable for LDO1. Float to enable.
LFB1
30
Feedback Kelvin sensing pin for LDO1 output voltage. Connect this pin to LDO1 resistor divider.
LOUT1
31
LDO1 output. Connect LOUT1 pin as close as possible to the (+) terminal of an output ceramic capacitor (suggest
1 µF).
LVIN1
32
Input power supply for LDO1. Connect LVIN1 pin as close as possible to the (+) terminal of an input ceramic capacitor
(suggest 1 µF).
PAD
—
There is no electric signal down bonded to thermal pad inside IC. Exposed thermal pad must be soldered to PCB for
optimal thermal performance.
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: TPS65262-1
5
TPS65262-1
SLVSCN5A – JUNE 2014 – REVISED OCTOBER 2014
www.ti.com
8 Specifications
8.1 Absolute Maximum Ratings
over operating free-air temperature (unless otherwise noted)
(1)
VIN1, VIN2, VIN3
LX1, LX2, LX3 (maximum withstand voltage transient