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.