Ultralow Power Energy Harvester PMUs

with MPPT and Charge Management

Data Sheet

ADP5091/ADP5092

Rev. A

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FEATURES

Boost regulator with maximum power point tracking (MPPT)

with dynamic sensing or no sensing mode

Hysteresis mode for best ultralight load efficiency

Input voltage operating range: 0.08 V to 3.3 V

Fast cold start from 380 mV (typical) with charge pump

Programmable shutdown point on MINOP pin based on the

input open circuit voltage (OCV)

150 mA regulated output from 1.5 V to 3.6 V

Battery terminal charging threshold (2.2 V to 5.2 V) to

support charging storage elements

Optional BACK_UP power path management

Radio frequency (RF) transmission conducive to shutting

down the switcher temporarily via microcontroller unit

(MCU) communication

APPLICATIONS

Photovoltaic (PV) cell energy harvesting

Thermoelectric generators (TEGs) energy harvesting

Industrial monitoring

Self powered wireless sensor devices

Portable and wearable devices with energy harvesting

TYPICAL APPLICATION CIRCUIT

SW

VIN

BAT

SYS

TERM

PGOOD

SETHYST

MPPT

CBP

DIS_SW

SETSD

MINOP

REF

BACK_UP

SYSTEM

LOAD

OPTIONAL

PRIMARY

BATTERY

SETBK

TO MCU

+

–

+

–

FROM MCU

REG_OUT

REG_D1

VID

LLD

TO MCU

REG_D0

FROM MCU

COLD START

CHARGE PUMP

ADP5091

MPPT

CONTROL

BOOST

REGULATOR

CHARGE CONTROL

AND

POWER PATH

MANAGEMENT

HYSTERESIS

REGULATOR

AND LDO

REG_FB

SETPG

RECHARGEABLE

BATTERY OR

SUPERCAP

AGND PGND

Figure 1.

GENERAL DESCRIPTION

The ADP5091/ADP5092 are intelligent, integrated energy

harvesting, ultralow power management unit (PMU) solutions

that convert dc power from PV cells or TEGs. These devices charge

storage elements such as rechargeable Li-Ion batteries, thin film

batteries, super capacitors, or conventional capacitors, and

power up small electronic devices and battery free systems.

The ADP5091/ADP5092 provide efficient conversion of the

harvested limited power from a 6 µW to 600 mW range with

submicrowatt operation losses. With the internal cold start circuit,

the regulator can start operating at an input voltage as low as

380 mV. After cold startup, the regulator is functional at an

input voltage range of 0.08 V to 3.3 V. An additional 150 mA

regulated output can be programmed by an external resistor

divider or the VID pin.

The MPPT control keeps the input voltage ripple in a fixed range to

maintain stable dc-to-dc boost conversion. The dynamic sensing

mode and no sensing mode, both programming regulation points

of the input voltage, allow extraction of the highest possible energy

from the harvester. A programmable minimum operation

threshold enables boost shutdown during a low input condition.

As a low light indicator for a microprocessor, the LLD pin of the

ADP5091 is the MINOP comparator output. However, the

REG_GOOD flag of the ADP5092 monitors the REG_OUT

voltage. In addition, the DIS_SW pin can temporarily shut down

the boost regulator and is RF transmission friendly.

The charging control function of the ADP5091/ADP5092 protects

the rechargeable energy storage, which is achieved by monitoring

the battery voltage with the programmable charging termination

voltage and the shutdown discharging voltage. In addition, a

programmable PGOOD flag monitors the SYS voltage.

An optional primary cell battery can be connected and managed

by an integrated power path management control block that is

programmable to switch the power source from the energy

harvester, rechargeable battery, and primary cell battery.

The ADP5091/ADP5092 are available in a 24-lead LFCSP and

are rated for a −40°C to +125°C temperature range.