MPF42791 datasheet(71/75 Pages) MPS

71 / 75 page

MPF42791 – 2 TO 16 BATTERY PACK FG W/ R DETECTION AND THERMAL MODEL

MPF42791 Rev. 1.0

MonolithicPower.com

9/19/2022

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

learning. In continuous learning mode, the

discharge

termination

current

updates

continuously while the pack discharges to

accurately determine the empty SOC. Past-cycle

learning uses the previous discharge cycle data

to learn. Continuous learning is recommended

for unpredictable discharge termination currents,

whereas past-cycle learning is recommended for

consistent discharge termination currents.

State-of-Health (SOH)

battery

cells

age,

their

total

capacity

decreases due to unwanted side reactions and

structural deterioration (often referred to as

capacity

fading).

Up-to-date

state-of-health

(SOH) information is important since it has a

major impact on the battery pack’s available

energy.

The MPF42791 incorporates an SOH learning

(SOH_LRN) feature that can track individual

cells’ capacities (SOH_CELLx) with respect to

their nominal capacity. This feature can identify

cells that are negatively impacting the overall

pack performance.

Equivalent Series Resistance (ESR)

As battery cells age, their equivalent series

resistance (ESR) increases due to unwanted

side reactions and structural deterioration (often

referred to as power fading). Up-to-date ESR

information is important since it has a major

impact on the battery pack’s available power and

SOC estimates.

The MPF42791 incorporates an ESR learning

(RESR_LRN) feature that tracks individual cells’

ESR (RESR_CELL_DIS_x) with respect to their

characterized value. This feature can identify

cells that are negatively impacting the overall

pack performance.

LIFETIME LOG SOC

Important events and certain conditions are

reported in the lifetime log to gain insight on how

the battery pack has been operating. The

MPF42791 backs the relevant registers up to its

non-volatile memory (NVM) every time the part

enters disabled mode (or for each elapsed hour).

Count Log

The count log is the number of times the pack

has been charged from below 15% to above

85%. The number of times the pack has been

charged by 10% and the number of shutdowns

are also reported in the lifetime log. Full

shutdowns and entering disabled mode are

considered

shutdowns,

and

increase

the

counter.

Current Log

The current log is the maximum charge and

discharge current that has been applied to the

pack. It is reported in the lifetime log.

Voltage Log

The voltage log tracks the maximum and

minimum voltage for each cell. This is reported

in the lifetime log. In addition, the maximum cell

voltage difference between two cells is also

reported, as well as their corresponding cell IDs.

Temperature Log

The temperature log tracks the maximum and

minimum temperature sensed on the pack. It

also

reports

the

maximum

temperature

difference between two sensors, and their

corresponding temperature sensor IDs.

The lifetime log details how much time the pack

has

operated

under

different

temperature

ranges.

Balancing Log

The balancing log tracks the number of times

each cell has been balanced.

PCB Layout Guidelines

Place the bypass capacitor between each pair of

VDD and GND pins, and as close as possible to

the pin.

MPF42791 Datasheet(PDF) 71 Page - Monolithic Power Systems

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