Плата защиты li-ion аккумулятора

Элемент для самостоятельного изготовления блока автономного питания bt.oscill

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микросхема контроллера: S-8261AAJMD-G2J-T2

сдвоенный полевой ключ: Si7900AEDN


The S-8261 series are lithium-ion/lithium polymer rechargeable
battery protection ICs incorporating high-accuracy voltage detection
circuit and delay circuit.
The S-8261 series are suitable for protection of single-cell lithium
ion/lithium polymer battery packs from overcharge, overdischarge and
„ Features
(1) Internal high accuracy voltage detection circuit
·  Overcharge detection voltage 3.9V to 4.4V (applicable in 5mV step)
Accuracy : ±25mV (+25°C) and ±30mV (-5°C to +55°C)
·  Overcharge hysteresis voltage 0.0V to 0.4V (*1) Accuracy : ±25mV
The overcharge hysteresis voltage can be selected from the range 0.0V to 0.4V in 50mV step.
*1: Overcharge release voltage = Overcharge detection voltage - Overcharge hysteresis voltage
(where overcharge release voltage<3.8V is prohibited.)
·  Overdischarge detection voltage 2.0V to 3.0 V (10mV step) Accuracy : ±50mV
·  Overdischarge hysteresis voltage 0.0V to 0.7 V (*2) Accuracy : ±50mV
The overdischarge hysteresis voltage can be selected from the range 0.0V to 0.7V in 100mV step.
*2: Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis voltage
(where overdischarge release voltage>3.4V is prohibited.)
·  Overcurrent 1 detection voltage 0.05V to 0.3V (10mV step) Accuracy : ±15mV
·  Overcurrent 2 detection voltage 0. 5V (fixed) Accuracy : ±100mV
(2) High voltage device is used for charger connection pins
VM and CO pins: absolute maximum rating = 28V
(3) Delay times (overcharge: tCU, overdischarge: tDL, overcurrent 1: tlOV1, overcurrent 2: tlOV2) are
generated by an internal circuit. No external capacitor is necessary. Accuracy : ±20%
(4) Three-step overcurrent detection circuit is included. (overcurrent 1, overcurrent 2, and load shortcircuiting)
(5) Either charge function or charge inhibition function for 0V battery can be selected.
(6) Charger detection function and abnormal charge current detection function
·  The overdischarge hysteresis is released by detecting negative voltage at the VM pin (-0.7V
typ.). (Charger detection function)
·  When the output voltage of the DO pin is high and the voltage at the VM pin is equal to or lower
than the charger detection voltage (-0.7V typ.), the output voltage of the CO pin goes low.
(Abnormal charge current detection function)
(7) Low current consumption
·  Operation 3.5 mA typ. 7.0 mA max.
·  Power-down 0.1 mA max.
(8) Wide operating temperature range: -40°C to +85°C
(9) Small package SOT-23-6 (6-pin) SNB(B) (6-pin)