MPF42791 datasheet(9/75 Pages) MPS

9 / 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.

TYPICAL PERFORMANCE CHARACTERISTICS

The MPF42791 fuel gauge performance depends on multiple factors, such as the accuracy of the

measurements, the correctness of the configuration, and the fidelity of the cell mathematical model. This

means that fuel gauge performance may vary depending on the battery operating conditions.

This section shows

examples of the MPS MPF42791 fuel gauge pack’s SOC performance when paired

with MPS’s MP279x AFE family.

Constant-Current/Constant-Voltage (CC/CV) Charge and Dynamic Discharge Cycle

The next scenarios consist of charging a 10S1P (6) battery using the typical CC/CV method, followed by

a highly dynamic discharge at different ambient temperatures. The charge constant current rate is 1C,

while the charge termination current in this example is 0.1C. The highly dynamic discharge corresponds

to a typical e-bike

’s current profile, with an average current of 1C and maximum peak currents up to 2.8C.

Figure 3 shows the current profile of the complete cycle at 25°C.

Figure 3: CC/CV Charge and Dynamic Discharge Current Profile

Figure 4 shows the MPF42791

’s performance for the CC/CV charge and dynamic discharge cycle at an

ambient temperature of 25°C. During charge, the root-mean-squared (7) and maximum pack SOC error

are 0.61% and 1.03%, respectively. During discharge, the root-mean-squared and pack SOC error are

0.78% and 1.94%, respectively.

Notes:

6) 10S1P refers to the battery configuration. There are 10 groups of 1 parallel cell connected in series.

7) The RMS error is equal to √

∑

(��−��

��)

��

��=1

��

, where

θ is the actual SOC, ��̂ is the estimated SOC, and N is the number of samples.

Figure 4: MPF42791 Performance for a CC/CV Charge and Dynamic Discharge (Ambient Temperature =

25°C)

100

120

140

1 0

Time min

-3

-2.5

-2

-1.5

-1

-0.5

0.5

100

120

140

1 0

Time min

100

-10

-5

-3

SOC Error ound

MPF42791

Reference

Error

MPF42791 Datasheet(PDF) 9 Page - Monolithic Power Systems

MPF42791 Datasheet(HTML) 9 Page - Monolithic Power Systems

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