1 Features
• 300-nA ultra-low IQ in low power mode
• Start-up into load at 0.7-V input voltage
• Operating input voltage from 0.7 V to 4.5 V
• Selectable output voltages up to 4.3 V
• Minimum 350-mA switch peak current limit
• Integrated LDO/load switch
• Two modes controlled by MODE pin
– Active mode: dual outputs at set values
– Low power mode: LDO/load switch off; boost
keeps on
• Automatic pass-through
• Up to 88% efficiency at 10-μA load from 2 V to 3.3
V conversion (low power mode)
• Up to 93% efficiency at 5-mA to 100-mA load from
2-V to 3.3-V conversion
• 1.5-mm × 1.5-mm WSON package

2 Applications
• Smart remote control
• BLE tag
• Wearable applications
• Low-power wireless applications
• Portable consumer or medical products
• Single-coin cell, single- or two-cell alkalinepowered
applications

3 Description
The TPS61098x is an ultra-low power solution for
products powered by either a one-cell or two-cell
alkaline, NiCd or NiMH, one-cell coin cell or one-cell
Li-Ion or Li-polymer battery. It integrates either a Lowdropout
Linear Regulator (LDO) or a load switch with
a boost converter and provides two output rails. The
boost output V(MAIN) is designed as an always-on
supply for a main system, and the LDO or load switch
output V(SUB) is to power peripheral devices.
The TPS61098x has two modes controlled by the
MODE pin: Active mode and Low Power mode. In
Active mode, both outputs are enabled with enhanced
response performance. In Low Power mode, the LDO
or load switch is disabled to disconnect peripherals.
The TPS61098x consumes only 300-nA quiescent
current and can achieve up to 88% efficiency at 10-μA
load in Low Power mode.
The TPS61098x supports automatic pass-through
function. When input voltage is higher than a passthrough
threshold, the boost converter stops switching
and passes the input voltage to the VMAIN rail; when
input voltage is lower than the threshold, the boost
works in Boost mode and regulates the output at
the target value. The TPS61098x provides different
versions for different output set values.
The TPS61098x can provide up to 50-mA total output
current at 0.7-V input to 3.3-V output conversion. The
boost is based on a hysteretic controller topology
using a synchronous rectifier to obtain maximum
efficiency at minimal quiescent current.
The TPS61098x is available in 1.5-mm × 1.5-mm
WSON package to enable small circuit layout size.