• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.

• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.

MITSUMI

3 cell Lithium-ion/Lithium-polymer battery protection IC MM3783 Series

(4) Instructions and directions for use

· When the current pathway of the charge and the discharge is separated, wiring is separated from the

drain of charge and discharge control FET.

· When the current pathway of the charge and the discharge is separated, do not connect load and

charger at the same time. It may incorrect-release from the discharging overcurrent detection state and

the short detection state.

· When the current pathway of the charge and the discharge is separated, please be sure to connect

capacitor (C5) of more than 0.1uF to between the drain and the source of charge control FET.

· If temperature protection function is repealed, please make TH pin and VDD pin connection and make a

REG pin open.

· Temperature detection property is adjusted using the thermo sensitive register of the following part

number, and resistance accuracy. In order to satisfy the characteristic of specification, it recommends

using the following parts.

Note5 : Calculation fomula of NTC resisance and voltage of TH terminal

· Ra = R0 * exp ( B * ( 1 / Ta - 1 / T0 ) )

Ra

: NTC resistance when the surrounding temperature is Ta(K).

R0

: NTC resistance when the surrounding temperature is T0(K).

B

: Thermistor constant

· Vdet = VREG * RTH / ( RTH + Rdet )

Vdet : Temperature protection detection threshold of MM3783 TH terminal.

VREG : Output voltage of MM3783 REG terminal.

Rdet : NTC resistance when the surrounding temperature is detection temperature.

RTH : The resistance between the TH terminal and the VSS terminal

Symbol

Name

Function

Part name

Remarks

RTNC

NTC

Thermistor

100k

±1%

B (25/50) =3950±1%

MF52D 104F 3950

Shenzhen DCH Electronic

RTH

Resistor

100k

±1%