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MB3836 Dataheets PDF



Part Number MB3836
Manufacturers Fujitsu
Logo Fujitsu
Description Li-lon Battery Protection
Datasheet MB3836 DatasheetMB3836 Datasheet (PDF)

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27707-2E ASSP for Power Supply Applications (For Secondary Battery) Li-Ion Battery Protection IC MB3836 s DESCRIPTION The MB3836 is a lithium-ion battery protection IC for three cells series lithium-ion battery pack in a notebook PC’s. This IC supports charging at 12.6 V and detects an over-charge, over-discharge, and over-current to control charging and discharging. The IC has a built-in function that makes the battery rechargeable even when the battery.

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FUJITSU SEMICONDUCTOR DATA SHEET DS04-27707-2E ASSP for Power Supply Applications (For Secondary Battery) Li-Ion Battery Protection IC MB3836 s DESCRIPTION The MB3836 is a lithium-ion battery protection IC for three cells series lithium-ion battery pack in a notebook PC’s. This IC supports charging at 12.6 V and detects an over-charge, over-discharge, and over-current to control charging and discharging. The IC has a built-in function that makes the battery rechargeable even when the battery voltage has decreased to 0 V. Upon detection of an over-discharge from the lithium-ion battery, the IC outputs a preliminary signal to stop discharging. This feature allows the notebook PC to save its memory data to hard disk. In addition, the IC allows the battery to be used up to the over-discharge level of each cell, increasing the operating time. After detecting an over-discharge, the IC disconnects all of its biases so that its current consumption becomes 0 µA. The IC can therefore make the battery pack rechargeable even when it has been left for an extended period of time with the output disconnected due to over-discharging. The battery can also be set into a quasi-over-discharged state even when the cell voltage is equal to or greater than the over-discharge detection voltage. When the notebook PC is shipped, the IC can prevent the battery pack from being discharged and turn off its bias sources, allowing the battery pack to be stored for a long time. The IC’s remote on/off function can turn off the output from the detached battery pack without the need for an external logic circuit or any mechanism on the notebook PC. This prevents the output from being short-circuited by a malfunction and facilitates the handling of the battery pack itself. The MB3836 is the best IC for protecting the lithium-ion battery pack used for a notebook PC. s PACKAGE 20-pin plastic SSOP (FPT-20P-M03) MB3836 s FEATURES Power supply voltage range : 6 V to 13.5 V High-precision over-charge detection voltage : 4.325 V ± 0.025 V Circuit power consumption after detecting over-discharge : 0 µA (Typ) Built-in quasi-over-discharge function Built-in pre-alarm function before shutting down of over-discharge Built-in remoting ON/OFF function Built-in over-discharge current detecting function with 2-step delay time : Vth = 300 mV→7 ms (Typ) : Vth = 600 mV→500 µs (Typ) • Built-in charge recovery function for 0 V cell • • • • • • • s PIN ASSIGNMENT (TOP VIEW) OCV : 1 COUT : 2 DOUT : 3 N.C. : 4 VS : 5 VCC : 6 BATH : 7 BATM : 8 BATL : 9 GND : 10 20 : OUTON 19 : PF 18 : PDWN 17 : MSW2 16 : MSW1 15 : VMON 14 : COVT 13 : COCT 12 : CUVT 11 : CPDT (FPT-20P-M03) 2 MB3836 s PIN DESCRIPTIONS Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin name OCV COUT DOUT N.C. VS VCC BATH BATM BATL GND CPDT CUVT COCT COVT VMON MSW1 I/O I O O  O  I I I      O I Description Over-current state and discharging/charging state detection terminal Pch MOS control output terminal for charging control switch Pch MOS control output terminal for discharging control switch No connection “H” level output terminal for remoting ON function Power supply terminal Battery connection terminal Battery connection terminal Battery connection terminal GND terminal Capacitor connection terminal for setting power-down delay time Capacitor connection terminal for setting PF output delay time Capacitor connection terminal for setting over-current detection time Capacitor connection terminal for setting over-charge detection time Output terminal of monitoring cell voltage Switching signal of monitoring cell voltage input terminal MSW1 MSW2 VMON output L L 17 MSW2 I H H L H L H  H cell voltage M cell voltage L cell voltage Cell voltage input block SW Depend on over-charge detection block Off Off Off 18 PDWN I Power down signal input terminal After input “H” level, Latch 3 will be set, DOUT=”H” level, and OCV=”L” level. At this time, all battery connecting terminal will be released, and all bias will be set OFF. PF signal output terminal Remoting ON signal input terminal After input “L” level, the bias of over-charge detection block will be set OFF. At this time, DOUT and COUT value will be equal to “H” level. 19 20 PF OUTON O I 3 4 MB3836 s BLOCK DIAGRAM VCC 6 bias Reference voltage block 300 mV ON/OFF 600 mV DOUT 3 COUT 2 bias ON/OFF OCV 1 − + − + Delay circuit (7 ms) (500 µs) Latch1 [Over-current detection block] 600 Ω Reset [Cell voltage input block] BATH 7 100 kΩ ×1 [Cell voltage monitoring block] + − [Over-charge detection block] Reset Delay circuit (23 ms) 5 VS Latch2 20 OUTON + BATM 8 100 kΩ − ×1 + − [Remote ON circuit block] 4.325 V (± 0.6%) BATL 9 100 kΩ ×1 − − − + [Over-discharge detection, and power fail circuit block] 19 PF PF output time (2 s) 2.75 V (±2%) Reset Latch3 Power down delay time (20 s) 18 PDWN Decoder 10 GND 15 16 17 13 COCT 14 COVT VMON MSW1 MSW2 11 CPDT 12 CUVT MB3836 s ABSOLUTE MAXIMUM RATINGS Parameter Power.


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