DC/DC Converter. TPS61280A Datasheet

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TPS61280A Datasheet
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Part TPS61280A
Description Wide- Voltage Battery Front-End DC/DC Converter
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TPS61280A, TPS61281A, TPS61282A
SLVSCG9B – MAY 2014 – REVISED SEPTEMBER 2016
TPS6128xA Low-, Wide- Voltage Battery Front-End DC/DC Converter
Single-Cell Li-Ion, Ni-Rich, Si-Anode Applications
1 Features
1 95% Efficiency at 2.3MHz Operation
• 3µA Quiescent Current in Low IQ Pass-Through
Mode
• Wide VIN Range From 2.3V to 4.8V
• IOUT 4A (Peak) at VOUT = 3.35V, VIN 2.65V
• Integrated Pass-Through Mode (35mΩ)
• Programmable Valley Inductor Current Limit and
Output Voltage
• True Pass-Through Mode During Shutdown
Best-in-Class Line and Load Transient
• Low-Ripple Light-Load PFM Mode
• In-Situ Customization with On-Chip E2PROM
(Write Protection)
• Two Interface Options:
– I2C Compatible I/F up to 3.4Mbps
(TPS61280A)
– Simple I/O Logic Control Interface
(TPS6128xA)
• Thermal Shutdown and Overload Protection
• Total Solution Size < 20mm2, Sub 1-mm Profile
2 Applications
• Single-Cell Ni-Rich, Si-Anode, Li-Ion, LiFePO4
Smart-Phones or Tablet PCs
• 2.5G/3G/4G Mini-Module Data Cards
• Current Limited Applications Featuring High Peak
Power Loads
3 Description
The TPS6128xA device provides a power supply
solution for products powered by either by a Li-Ion,
Nickel-Rich, Silicon Anode, Li-Ion or LiFePO4 battery.
The voltage range is optimized for single-cell portable
applications like in smart-phones or tablet PCs.
Used as a high-power pre-regulator, the TPS6128xA
extends the battery run-time and overcomes input
current- and voltage limitations of the powered
system.
While in shutdown, the TPS6128xA operates in a true
pass-through mode with only 3µA quiescent
consumption for longest battery shelf life.
During operation, when the battery is at a good state-
of-charge, a low-ohmic, high-efficient integrated pass-
through path connects the battery to the powered
system.
If the battery gets to a lower state of charge and its
voltage becomes lower than the desired minimum
system voltage, the device seamlessly transits into
boost mode to uses the full battery capacity.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61280A
TPS61281A
DSBGA (16)
1.66 mm x 1.66 mm
TPS61282A
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
Battery
2.5V .. 4.35V
L
0.47μH
CI
1.5µF X5R 6.3V (0402)
Voltage Select
Enable
Forced Bypass / Auto
I2 C Bus
TPS61280A
SW
SW
VIN
VIN
VSEL
EN
BYP
SCL
SDA
PGND
PGND
PGND
VOUT
VOUT
VBAT’
CO (x2)
10µF X5R 6.3V (0603)
1.8V
GPIO
Interrupt
AGND
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.



Texas Instruments TPS61280A
TPS61280A, TPS61281A, TPS61282A
SLVSCG9B – MAY 2014 – REVISED SEPTEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Schematic............................................. 1
5 Revision History..................................................... 2
6 Device Comparison Table..................................... 3
7 Description (continued)......................................... 3
8 Pin Configurations and Functions ....................... 4
9 Specifications......................................................... 6
9.1 Absolute Maximum Ratings ..................................... 6
9.2 ESD Ratings.............................................................. 6
9.3 Recommended Operating Conditions....................... 6
9.4 Thermal Information .................................................. 7
9.5 Electrical Characteristics........................................... 7
9.6 I2C Interface Timing Characteristics ........................ 9
9.7 I2C Timing Diagrams............................................... 11
9.8 Typical Characteristics ............................................ 12
10 Detailed Description ........................................... 14
10.1 Overview ............................................................... 14
10.2 Functional Block Diagram ..................................... 15
10.3 Feature Description............................................... 16
10.4 Device Functional Modes...................................... 17
10.5 Programming......................................................... 22
10.6 Register Maps ....................................................... 25
11 Application and Implementation........................ 33
11.1 Application Information.......................................... 33
11.2 Typical Application ................................................ 34
12 Power Supply Recommendations ..................... 46
13 Layout................................................................... 46
13.1 Layout Guidelines ................................................. 46
13.2 Layout Example .................................................... 46
13.3 Thermal Information .............................................. 47
14 Device and Documentation Support ................. 48
14.1 Device Support...................................................... 48
14.2 Related Links ........................................................ 48
14.3 Receiving Notification of Documentation Updates 48
14.4 Community Resources.......................................... 48
14.5 Trademarks ........................................................... 48
14.6 Electrostatic Discharge Caution ............................ 48
14.7 Glossary ................................................................ 48
15 Mechanical, Packaging, and Orderable
Information ........................................................... 49
15.1 Package Summary................................................ 49
15.2 Chip Scale Package Dimensions.......................... 49
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (September 2014) to Revision B
Page
• Moved Storage temperature spec, Tstg from Handling Ratings table to Abs Max Ratings table; and, re-named
Handling ratings to ESD Ratings ........................................................................................................................................... 6
• Changed the device number in Figure 11 From TPS61281 and TPS61282 To: TPS61281A and TPS61282A ................. 12
• Changed the device number in Figure 24 through Figure 26 From TPS6128x To: TPS6128xA......................................... 24
• Added legal Note at Application and Implementation section. ............................................................................................. 33
• Added cross reference to the Third-Party Products Disclaimer. ......................................................................................... 37
• Corrected legend for Figure 30, Gray is VIN = 3.0 V, Red is VIN = 2.5 V. ............................................................................ 38
• Added cross reference to Third-Party Products Disclaimer ................................................................................................. 42
• Changed the markings on Figure 67 ................................................................................................................................... 49
Changes from Original (May 2014) to Revision A
Page
• Changed the Device Information table Package From: DGBA To: DSBGA ......................................................................... 1
• Deleted the Package Marking Chip Code column from the Device Comparison Table. The information is found in
the POA at the end of the datasheet...................................................................................................................................... 3
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Copyright © 2014–2016, Texas Instruments Incorporated
Product Folder Links: TPS61280A TPS61281A TPS61282A



Texas Instruments TPS61280A
www.ti.com
6 Device Comparison Table
TPS61280A, TPS61281A, TPS61282A
SLVSCG9B – MAY 2014 – REVISED SEPTEMBER 2016
PART NUMBER(1)
TPS61280A
I2C Control Interface
User Prog. E2PROM Settings
TPS61281A
Simple Logic Control Interface
TPS61282A
Simple Logic Control Interface
DEVICE
SPECIFIC FEATURES
DC/DC boost / bypass threshold = 3.15V (Vsel = L)
DC/DC boost / bypass threshold = 3.35V (Vsel = H)
Valley inductor current limit = 3A
DC/DC boost / bypass threshold = 3.15V (Vsel = L)
DC/DC boost / bypass threshold = 3.35V (Vsel = H)
Valley inductor current limit = 3A
DC/DC boost / bypass threshold = 3.3V (Vsel = L)
DC/DC boost / bypass threshold = 3.5V (Vsel = H)
Valley inductor current limit = 4A
(1) The 'A’ version has lower ripple and overshoot, supports Forced PWM at startup but with a 0.4 μA higher IQ.
7 Description (continued)
TPS6128xA device supports more than 4A pulsed load current even from a deeply discharged battery. In this
mode of operation, the TPS6128xA enables the utilization of the full battery capacity: A high battery-cut-off
voltage originated by powered components with a high minimum input voltage is overcome; new battery
chemistries can be fully discharged; high current pulses forcing the system into shutdown are buffered by the
device seamlessly transitioning between boost and by-pass mode back and forth.
This has significant impact on the battery on-time and translates into either a longer use-time and better user-
experience at an equal battery capacity or into reduced battery costs at similar use-times.
The TPS6128xA offers a small solution size (< 20mm2) due to minimum amount of external components,
enabling the use of small inductors and input capacitors, available as a 16-pin chip-scale package (CSP).
The TPS6128xA operates in synchronous, 2.3MHz boost mode and enters power-save mode operation (PFM) at
light load currents to maintain high efficiency over the entire load current range.
Copyright © 2014–2016, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: TPS61280A TPS61281A TPS61282A
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