TPS61280 Datasheet, PDF (1/58 Pages) Texas Instruments – Low-, Wide- Voltage Battery Front-End DC/DC Converter Single-Cell Li-Ion, Ni-Rich, Si-Anode Applications

TPS61280, TPS61281, TPS61282
www.ti.com
SLVSBI1 – OCTOBER 2013
Low-, Wide- Voltage Battery Front-End DC/DC Converter
Single-Cell Li-Ion, Ni-Rich, Si-Anode Applications
Check for Samples: TPS61280, TPS61281, TPS61282
FEATURES
1
•2 95% Efficiency at 2.3MHz Operation
• 2µA Quiescent Current in Low I_Q Pass-
Through Mode
• Wide V_IN Range From 2.3V to 4.8V
• I_OUT ≥ 4A (Peak) at V_OUT = 3.35V, V_IN ≥ 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 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
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
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
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.
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 very 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).
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
I²C is a trademark of NXP Semiconductors.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated