1 Features
• 95% efficiency at 2.3 MHz operation
• 3-μA quiescent current in low IQ pass-through
mode
• Wide VIN range from 2.3 V To 4.8 V
• IOUT ≥ 4-A (Peak) at VOUT = 3.35 V, VIN ≥ 2.65 V
• Integrated pass-through mode (35 mΩ)
• 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 3.4 Mbps
(TPS61280D/E)
– Simple I/O logic control interface
• Thermal shutdown and overload protection
• Total solution size < 20 mm2, 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 TPS6128xD/E 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
TPS6128xD/E extends the battery run-time and
overcomes input current- and voltage limitations of the
powered system.
While in shutdown, the TPS6128xD/E operates in
a true pass-through mode with only 3-μA quiescent
consumption for longest battery shelf life.
During operation, when the battery is at a good stateof-
charge, a low-ohmic, high-efficient integrated passthrough
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.