The TPS6112x devices provide a complete power supply solution for products powered by
either a one-cell Li-Ion or Li-Polymer by either a one-cell Li-Ion or Li-Polymer battery, or a two-
to four-cell Alkaline, NiCd, or NiMH battery. The devices can generate two stable output voltages
that are either adjusted by an external resistor divider or are fixed internally on the chip. The
device also provides a simple solution for generating 3.3 V out of a one-cell Li-Ion or Li-Polymer
battery at a maximum output current of at least 200 mA with supply voltages down to 1.8 V. The
implemented boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller
using a synchronous rectifier to obtain maximum efficiency. The maximum peak current in the boost
switch is limited to a value of 1600 mA.
The converter can be disabled to minimize battery drain. During shutdown, the load is
completely disconnected from the battery. A low-EMI mode is implemented to reduce ringing and, in
effect, lower radiated electromagnetic energy when the converter enters discontinuous conduction
mode. A power good output at the boost stage simplifies control of any connected circuits like
cascaded power supply stages or microprocessors.
The built-in LDO can be used for a second output voltage derived either from the boost
output or directly from the battery. The LDO can be enabled separately that is, using the power
good of the boost stage. The device is packaged in a 16-pin VQFN (RSA) package measuring 4 mm × 4
mm or in a 16-pin TSSOP (PW) package.