General description

The NBM5100A/B is a battery energy management

device designed to maximize usable capacity from

non-rechargeable, primary batteries when used in lowvoltage, low-power applications requiring burst current

loads. The devices overcome voltage drop and battery

life limitations associated with extracting high pulse

currents (Fig. 1) from lithium primary batteries such

as 3.6 V lithium thionyl chloride (Li-SOCl2), which are

commonly used in wireless, low-power IoT sensor

applications.

The NBM5100A/B contains two stages of high

efficiency DC-DC conversion and an intelligent learning

algorithm. The first stage DC-DC conversion transfers

energy from the 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 with high pulse

load current capability on the VDH output pin. The

battery is never directly subjected to large load pulse

currents, resulting in a longer, more predictable battery

lifetime.

The proprietary learning algorithm monitors the energy

used during repetitive load pulse cycles and optimizes

first stage DC-DC conversion to minimize the residual

charge in the storage capacitor.

A serial interface allows a microcontroller to change

default configuration settings and read-back system

information

Features and benefits

• Programmable constant battery load current: 2 mA

to 16 mA

• Protection against battery voltage dips (Brown-out)

• Pulse output current: > 150 mA

• Low ripple regulated programmable output voltage,

VDH: 1.8 V to 3.6 V

• Ultra-low standby current: < 50 nA

• Peak conversion efficiency > 90% with adaptive

optimization

• Integrated fuel gauge

• Integrated capacitor voltage balancing circuit

• Small 16 pin lead-free package

(SOT763-1/DHVQFN16;

2.5 mm × 3.5 mm × 0.85 mm)

• Specified from -40 °C to +85 °C

Applications

• Battery powered wireless microcontroller

applications (IoT): Bluetooth®, LoRaWAN®,

Sigfox™, LTE-M, NB-IoT, Zigbee, etc.

• Industrial: temperature, occupancy, e-metering,

electronic shelf label, asset tracking, irrigation

monitoring

• Consumer/wearable: location tags, heart rate

monitor, blood glucose meter, remote controls, key

fobs