DC/DC Converter. TPS61282 Datasheet

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TPS61282 Datasheet
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Part TPS61282
Description Wide- Voltage Battery Front-End DC/DC Converter
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Texas Instruments TPS61282
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS61280, TPS61281, TPS61282
SLVSBI1A – OCTOBER 2013 – REVISED SEPTEMBER 2014
TPS6128x 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
• 2µA 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
• Programmable Average Input 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 Protect)
• Two Interface Options:
– I2C Compatible I/F up to 3.4Mbps (TPS61280)
– Simple I/O Logic Control Interface (TPS6128x)
• 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 TPS6128x 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 TPS6128x
extends the battery run-time and overcomes input
current- and voltage limitations of the powered
system.
While in shutdown, the TPS6128x operates in a true
pass-through mode with only 2µA 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 utilize the full battery capacity.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61280
TPS61281
DSBGA (16)
1.66 mm x 1.66 mm
TPS61282
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
Battery
2.5V .. 4.35V
L
0.47 μH
CI
1.5µF X5R 6.3V (0402)
Voltage Select
Enable
Forced Bypass / Auto
I2C Bus
TPS61280
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 TPS61282
TPS61280, TPS61281, TPS61282
SLVSBI1A – OCTOBER 2013 – REVISED SEPTEMBER 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Schematic............................................. 1
5 Revision History..................................................... 2
6 Description (continued)......................................... 3
7 Device Comparison Table..................................... 3
8 Pin Configuration and Functions ......................... 4
9 Specifications......................................................... 6
9.1 Absolute Maximum Ratings ..................................... 6
9.2 Handling Ratings....................................................... 6
9.3 Recommended Operating Conditions....................... 6
9.4 Thermal Information .................................................. 7
9.5 Electrical Characteristics........................................... 7
9.6 Timing Requirements ................................................ 9
9.7 I2C Interface Timing Characteristics ........................ 9
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...................................... 18
10.5 Programming......................................................... 23
10.6 Register Maps ....................................................... 26
11 Application and Implementation........................ 34
11.1 Application Information.......................................... 34
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 Consideration.......................................... 47
14 Device and Documentation Support ................. 48
14.1 Device Support...................................................... 48
14.2 Related Links ........................................................ 48
14.3 Trademarks ........................................................... 48
14.4 Electrostatic Discharge Caution ............................ 48
14.5 Glossary ................................................................ 48
15 Mechanical, Packaging, and Orderable
Information ........................................................... 49
15.1 Package Summary................................................ 49
5 Revision History
Changes from Original (October 2013) to Revision A
Page
• Added Handling Rating table, Feature Description section, Device Functional Modes, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section. .............................................................. 1
• Added the Device Information table ....................................................................................................................................... 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 ..................................................................................................................................... 4
• Added "Voltage at VIN" to the Absolute Maximum Ratings table .......................................................................................... 6
• Changed the Typical Characteristics section graphs .......................................................................................................... 12
• Changed the second paragraph in the Start-Up and Shutdown Mode section.................................................................... 21
2 Submit Documentation Feedback
Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links: TPS61280 TPS61281 TPS61282



Texas Instruments TPS61282
www.ti.com
TPS61280, TPS61281, TPS61282
SLVSBI1A – OCTOBER 2013 – REVISED SEPTEMBER 2014
6 Description (continued)
TPS6128x device supports more than 4A pulsed load current even from a deeply discharged battery. In this
mode of operation, the TPS6128x 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 TPS6128x 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.
The TPS6128x 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).
7 Device Comparison Table
PART NUMBER
TPS61280
I2C Control Interface
User Prog. E2PROM Settings
TPS61281
Simple Logic Control Interface
TPS61282
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
Copyright © 2013–2014, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: TPS61280 TPS61281 TPS61282
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