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BQ77PL157APWR-4225
Voltage Protection for 3 to 6 Series Cell Lithium-Ion/Polymer Batteries
bq77PL157A4225
www.ti.com SLUSA00B –MARCH 2010–REVISED APRIL 2012
Voltage Protection for 3-Seriesto 6-Series Cell Lithium-Ion/Polymer Batteries
Checkfor Samples: bq77PL157A4225
1FEATURES
DESCRIPTION• SingleIC Li-Ion Protection for 3-Seriesto6- The bq77PL157isa stackable overvoltage protection
Series Cells device for3,4,5or6 series cell Li-Ion battery packs.
• Stackableto Protect upto 18-Series Cells This device incorporatesa precise and accurate
Programmable Detection Time Delay overvoltage detection circuit with preconfigured
threshold limits. Additional features include the ability
• Low Power Consumption to stack multiple partsto monitor up to 18 series
– Typical2-µAto 2.5-µA Normal Mode cells.
• Fixed 4.225V Overvoltage Threshold FUNCTION• Highly Accurate: ±20-mV MAX,TA= 0°CtoEach series cellina Li-Ion battery packis compared
50°C to an internal reference voltage.If one cell reaches
• Output Activation for Low Side FET an overvoltage condition, the protection sequence
(ContactTI for Alternate Output Options: begins. The bq77PL157 starts charging an external
High/Low-side Fuseor FET) capacitor through the CD pin. When the CD pin
Protected Output, Power, and Ground Pins for voltage reaches 1.2 V, the OUT pin changes state
Added Safety and Reliability and the LVO pin becomes active.
Permanentor Recoverable Fault Options If multiple bq77PL157 devices are stacked, the LVIN
pinof the next-lower device receives the LVO pin
• 16-pin Small Outline Packagefrom the above device and similarly starts a
shortened delay timer before activatingits OUT pin.
APPLICATIONS (No additional isolation or level-shift circuitry is
• Primaryor Secondary Level Voltage Protection required.) The lowest bq77PL157in the stringis used
for Li-Ion Battery Packs for Use in: to activatea power MOSFET locatedin the low side the power path.
– Power Tools UPS Systems E-Bikes, Scooters, and Small Mobility
Vehicles Medical Devices, Test Equipment, and
Industrial Products
