Coin cell battery life booster
with adaptive power
optimization
Improves lithium coincell performanceand battery life

NBM5100A/B, NBM7100A/B
Lithium primary coin cell batteries (e.g. CR2032) aresmall, low-leakage, energy dense sources routinely used
to supply low power wireless IoT sensor electronics
utilizing interfaces like Bluetooth, Zigbee, NB-IoT andother wireless protocols. IoT sensors are often size/spaceconstrained and are frequently placed in hard to accesslocations making battery replacement difficult.

While more energy dense (Wh/kg) versus other primary
battery chemistries (e.g. alkaline), it is difficult to extract
more than a few 10s of mW from a coin cell before its
capacity starts to degrade. During a transmission cycle, atypical IoT sensor requires 100s of mW and is expected tolast for thousands of transmission cycles before its battery
reaches end of life.
Nexperia’s coin cell battery life boosters are designed
to overcome the challenges of lithium primary batteries
operating under burst load conditions as found in IoT
sensors thereby extending the useful lifetime between
replacement by typically 4-10 times. The NBM devices
are suitable for use with LiMnO2 (coin) and Li-SOCL2(lithium thionyl chloride) type batteries up to 3.6 V.

Overview
The NBM5100A/B, NBM7100A/B devices are integrated power
management circuits containing 2 stages of high efficiency
DC/DC conversion and an intelligent learning algorithm. The
devices overcome voltage drop and battery life limitations
associated with extracting high pulse currents from lithium
primary batteries such as 3.6 V lithium thionyl chloride (LiSOCl2) or 3 V lithium manganese dioxide (LiMnO2) batteries.
The first stage DC/DC conversion transfers energy fromthe lithium battery at a low constant current to a capacitive
storage element. Once charged, a second DC/DC conversion
cycle utilizes this stored energy to supply a regulated voltage
output capable of high pulse current loads. The battery isnever directly subjected to large pulse currents, resulting ina longer, predictable battery lifetime.
NBM5100B and NBM7100B include a SPI serial port interface.
NBM5100A and NBM7100A are offered with I2C serialinterface as well as an autonomous mode which minimizes
communication requirements on the I2C bus. This is useful for
applications where no ‘smart microcontrollers” are present.

Applications

Features and benefits› Programmable constant battery load current: 2 to 16 mA› Protection against battery voltage dips (Brown-out)› Pulse load output current: ≤ 200 mA› Regulated programmable output voltage VDH: 1.8 V to 3.6 V› Ultra-low standby current: < 50 nA› Typical conversion efficiency of > 90% with adaptive optimization› 63 adaptive load optimization settings› Integrated fuel gauge› Small 16 pin lead-free package› Battery powered wireless microcontroller applications:Bluetooth®, LoRaWAN®, Sigfox™, LTE-M, NB-IoT, Zigbee› Industrial: temperature, occupancy, e-metering, electronic
shelf label, asset tracking, irrigation monitoring› Consumer/wearable: location tags, heart rate monitor,blood glucose meter(SOT763-1/DHVQFN16; 2.5 mm × 3.5 mm × 0.85 mm)› Specified from -40 °C to +85 °C
Block diagrams

L
CXXXX?
CXXXX?

VBTVBT

CXXXX?
CXXXX?
(SUPER(SUPERCAPACITOR)CAPACITOR)L

LX1LX1LX2LX2 CAPCAPL

BALBALCXXXX?
CXXXX?

VBTVBTL

LX1LX1LX2LX2CAPCAPBALANCEBALANCE
2-162-16mA mA

2-162-16
mA mA

BOOST
BOOST
CONVERTER
CONVERTER

CXXX?CXXX?

BOOST
BOOST
CONVERTER
CONVERTER

VDHS
VDHS
BUCK/BOOSTBUCK/BOOSTREGULATORREGULATOR

VDHS
VDHS
BUCK/BOOSTBUCK/BOOSTREGULATORREGULATORVDHVDHVDHVDHCVDHCVDHCVDHCVDH

VDPVDP

SDASDA| SDO| SDO

CVDPCVDP

START-UP
START-UP

Vref Vref

OPTIMIZEROPTIMIZERSCLSCL| SCLK| SCLKVDPVDP
CVDPCVDP

START-UP
START-UP

Vref Vref

OPTIMIZEROPTIMIZERVBTVBTVCAPVCAPVDHVDHSCLSCL| SCLK| SCLK

I²C/SPI
I²C/SPI
CONTROL
CONTROL

SDASDA| SDO| SDO

ADDADD| SDI| SDIVBTVBTVCAPVCAPVDHVDH
I²C/SPI
I²C/SPI
CONTROL
CONTROL

ADDADD| SDI| SDICOMPARATORSCOMPARATORSSTARTSTART
| CSN
| CSN

RDYRDYCOMPARATORSCOMPARATORSSTARTSTART
| CSN
| CSN

NBM5100A/B
NBM5100A/B

VSSVSSRDYRDY

NBM7100A/B
NBM7100A/B

VSSP
VSSP

VSSVSSVSSP
VSSP

Product FamilyDevice part Number

Bus Interface

Autonomous Start
ModeStorage Cap Charge
Balance Function

Max Storage
Cap Voltage

Max Load Current

NBM7100A

I2C

Supported

Not Supported

11 V

200 mA

NBM5100A

I2C

Supported

Supported

5.5 V

150 mA

Nbm7100B

SPI

Not Supported

Not Supported

11 V

200 mA

NBM5100B

SPI

Not supported

Supported

5.5 V

150 mA© 2023 Nexperia B.V.
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nexperia.com

Date of release:
June 2023
Printed:In the Netherlands