产品详情

MM3474GB2VBE 美上美锂电池保护芯片

Outline

MM3474 series is an overcharge, overdischarge and overcurrent protection IC for a lithium-ion / lithiumpolymer rechargeable secondary battery. Lithium-ion / lithium-polymer rechargeable secondary battery overcharge each cell, over discharge, and discharge overcurrent, short circuits can be detected.

This supports 3 to 5 serial cells connected in series, and switches over to the desired no. of cells by sending High / Low signal to SEL terminal.

This also provides the control terminals of output over discharge detection (SDC) and output over charge detection (SOC), which allows configuring an application with fewer external parts for 6 or more cells connected in series.

Features (Unless otherwise specifi ed, Topr=+25°C)

(1) Range and accuracy of detection / release voltage

Overcharge detection voltage 3.6V to 4.5V, 5mV steps Accuracy±25mV (Topr=±0 to +50°C)

Overcharge release voltage 3.4V to 4.5V, 50mV steps Accuracy±50mV

Overdischarge detection voltage 2.0V to 3.0V, 50mV steps Accuracy±80mV

Overdischarge release voltage 2.0V to 3.4V, 50mV steps Accuracy±100mV

Overcurrent detect voltage 50mV to 300mV, 5mV steps Accuracy±15mV

Short detection voltage 0.2V to 1.0V, 50mV steps Accuracy±100mV

(2) Each detection delay time set by the external capacitor

(3) The setting for three cell , for four cell , and for fi ve cell protection can be set with the SEL1 pin

and the SEL2 pin.

(4) The charge and discharge of the battery can be controlled with SDC pin and SOC pin.

(5) Low current consumption

Consumption current1 (Vdd) , Vcell=4.4V Typ. 10.0μA, Max. 20.0μA

Consumption current2 (Vdd) , Vcell=3.5V Typ. 5.0μA, Max. 10.0μA

Consumption current3 (Vdd) , Vcell=1.8V Typ. 1.5μA, Max. 3.0μA

Consumption current1 (V5) , Vcell=4.4V Typ. 4.0μA, Max. 8.0μA

Consumption current2 (V5) , Vcell=3.5V Typ. 3.0μA, Max. 6.0μA

Consumption current3 (V5) , Vcell=1.8V Typ. 1.5μA, Max. 3.0μA

(6) Absolute maximum ratings

VDD pin VSS2−0.3V to +30V

V5 pin V4−0.3V to VDD+0.3V

Between the input terminals of voltage of battery −0.3V to +10V

V− pin, CS pin VDD−30V to VDD+0.3V

OV pin, DCHG pin VSS2−0.3V to VDD+0.3V

SEL pin VSS2−0.3V to VDD+0.3V

SDC pin, SOC pin VSS2−0.3V to VDD+0.3V

Storage temperature −55ºC to +125ºC

Operation temperature −40ºC to +85ºC