LP4081 TWS Linear Charger with Power Path Management
■The LP4081 is a fully integrated linear charger solution with power path management targeting True Wireless Stereo (TWS) applications which needs small solution size, low quiescent current and bi-directional communication. A low on-resistance BUS-FET is integrated to manage the input power from a BUS pin. A bidirectional BAT-FET is integrated to manage charging and discharging of the battery. A SYS pin delivers power to the system that contains an SoC typically. The charger has an ideal-diode mode for high efficiency and low heat operation. The minimum voltage drop across the BUS pin and BAT pin is only 75mV when charging. The LP4081 offers power path management that allows the system to be powered up with a fully-discharged battery. It can dynamically mange the power from the BUS input and the battery to meet the system loading needs. An I2C interface enables programming various parameters of charging, discharging and multiple protection functions. An interrupt output (IRQb) sends a signal to the SOC when an interrupt event happens, so the SoC can take actions accordingly.
■Multiple features are offered for the safe operation of the system, including input voltage OVP (over voltage protection), UVLO (under voltage lockout), OTP (over temperature protection), SCP (short circuit protection), system reset, watchdog timer, etc. When powered by a battery, LP4081 can be further reduced to 0.4-μA when entering ship mode.
■The whole system is in a 12-pin 2 X 2 QFN package.
●Features
■Input over-voltage protected up to 16V
■Charge Management
◆Programmable charge current up to 1A
◆Programmable floating voltage with 0.3% accuracy
◆75mV low dropout charging and how heat
◆Programmable trickle charge and termination current with minimum 1mA termination current
■Automatic re-charge and thermal foldback
■I2C bus to SoC with an interrupt pin
■Low drop-out fast charge function and low heat
■Power path management
■RESET output when inserted into the charging case
■PWRON output when removed from the charging case
■Support private one-wire instructions
■Charge safety timer and watchdog
■High-accuracy current mirror output for gauge-related application
■Rich protections: UVLO, OVP, SCP
■Minimum 0.6-μA iq in normal operation
■0.4-μA ultra-low iq in ship mode
■2mm Χ 2mm QFN-12 package
■RoHS Compliant and 100% Lead (Pb) Free
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[ TWS ][ Wireless Microphone ][ Smart Glasses ][ Fitness Application ][ Smart Watch ][ Remote Control ] |
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Datasheet |
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Please see the document for details |
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QFN-12;QFN |
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English Chinese Chinese and English Japanese |
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10/23/2023 |
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Rev: 1p3 |
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2.8 MB |
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