A4057 AITSEMI | Alldatasheet
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AiT Semiconductor Inc. www.ait-ic.com A4057 BATTERY MANAGEMENT LINEAR LI-ION BATTERY CHARGER REV1.2 - FEB 2014 RELEASED, AUG 2021 UPDATED - - 1 - DESCRIPTION FEATURES A4057 series is a double lithium battery charge management chip. The chip includes a charge state detection, the charging process, temperature detection and so on . The chip also integrates a high-precision reference voltage module in it. A4057 charge contains three modes: precharge, constant current charging, constant voltage charging. Constant current charging current is five times the pre -charge current; when the voltage is lower than 6.5V into the precharge mode; when the voltage i s above 6.5V into the con stant current charge mode, the charging current is five times as the precharge, the charging current is determined by an external resistor. The A4057 is available in SOP8 package.
ORDERING INFORMATION
SPQ: 4,000pcs/Reel A4057M8R-XX A4057M8VR-XX Note XX: Output Voltage 84=8.4V V: Halogen free Package R: Tape & Reel AiT provides all RoHS products ⚫ Double lithium battery charge management ⚫ Only need a few external components ⚫ Pre-charge, constant current charging , constant voltage charging mode ⚫ Temperature detection ⚫ Two charging status ⚫ Available in SOP8 package APPLICATION ⚫ Digital camera ⚫ PDAS ⚫ The phone lithium battery TYPICAL APPLICATION Note: D1 is a Scho ttky; R S has been suggested that high-precision ( 1% ) in order to ensure current accuracy, R1 and R2 is not required precision.
AiT Semiconductor Inc. www.ait-ic.com A4057 BATTERY MANAGEMENT LINEAR LI-ION BATTERY CHARGER REV1.2 - FEB 2014 RELEASED, AUG 2021 UPDATED - - 2 - PIN DESCRIPTION Top View Pin # Symbol Function
1 CS Overcharge detection pin
2 DONE Charge status pin1
3 CHRG Charge status pin2
4 VDD Power input
5 DRC External MOS or PNP control pin
6 GND Ground
7 VT Battery temperature detection pin
8 BATT Battery voltage detection
AiT Semiconductor Inc. www.ait-ic.com A4057 BATTERY MANAGEMENT LINEAR LI-ION BATTERY CHARGER REV1.2 - FEB 2014 RELEASED, AUG 2021 UPDATED - - 3 - ABSOLUTE MAXIMUM RATINGS VDD, Input Supply Voltage VSS-0.3V~VSS+18V VDRC, DRC pin Voltage VSS-0.3V~18V VBAT, BAT pin Voltage VSS-0.3V~12V VCS, CS pin Voltage VSS-0.3V~6V VCHRG, CHAG pin Voltage VSS-0.3V~18V VDONE, DONE pin Voltage VSS-0.3V~18V VNTC, NTC pin Voltage VSS-0.3V~6V TOPA, Operating Ambient Temperature -40°C~+85°C TSTR, Storage Temperature -65°C~+125°C Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
TA=25℃, unless specified Parameter Symbol Conditions Min. Typ. Max. Unit Operating Current 1 IDD (OPE) 9V<VDD<20V - - 350 μA Input Current 2 IDD (SLP) VDD<7.5 - - 20 μA VBATT Pin Voltage VBATT 8.27 8.36 8.45 V Constant Current Charging Current Iconst 90/Rs 100/Rs 110/Rs mA Trickle Charge Current Ipre 18/Rs 20/Rs 22/Rs mA Precharge Threshold Voltage VO(min) 6.2 6.5 6.8 V Recharge Threshold Voltage VO(RCH) - -400 - mV VT High Temperature Shutdown Voltage VT-hot 45 50 55 mV VT Low Temperature Shutdown Voltage VT-cold 1800 2000 2200 mV Low Power Lockout Threshold Voltage VUVLO - 7.5 - V
AiT Semiconductor Inc. www.ait-ic.com A4057 BATTERY MANAGEMENT LINEAR LI-ION BATTERY CHARGER REV1.2 - FEB 2014 RELEASED, AUG 2021 UPDATED - - 4 - TYPICAL PERFORMANCE CHARACTERISTICS Charging process description DETAILED INFORMATION When the input voltage VDD is below the UVLO level, the chip will enter into the SLEEP MODE, the chip power consumption will down to 20μA; When the VDD pin voltage rises above the UVLO voltage or more, the chip will into the CHRG the MODE, a charge cycle begins, early in the charge cycle, if the battery voltage is lower than the trickle charge threshold voltage (6.5V) the charger goes into trickle charge mode. The trickle charge current is internally set to 20% of the maximum charging current. When the battery voltage exceeds the trickle charge threshold, the charger enters constant current charging mode, the charging current from the internal 100mV baseline and the external sense resistor to a decision. The chip also with battery temperature detection function, this function through the VT side, and in VT termination of a negative temperature coefficient 10kΩ thermistor, as the temperature rises to 80 degrees, the pin voltage is 50mV for low temperature to reach -30 degrees, the point voltage of 2V, only there voltage in the range of the two voltage values, the chip in order to work properly, otherwise the charge is stopped, the LED is not lit, this pin can be directly connected to shield of the temperature detection. Charging status display in the table below: No-load Trickle charge High current charging Fully charged NTC is not in the scope of state Done（Green） Flicker Off Off On Off Charge（Red） Off On On Off Off
AiT Semiconductor Inc. www.ait-ic.com A4057 BATTERY MANAGEMENT LINEAR LI-ION BATTERY CHARGER REV1.2 - FEB 2014 RELEASED, AUG 2021 UPDATED - - 5 - BLOCK DIAGRAM
AiT Semiconductor Inc. www.ait-ic.com A4057 BATTERY MANAGEMENT LINEAR LI-ION BATTERY CHARGER REV1.2 - FEB 2014 RELEASED, AUG 2021 UPDATED - - 6 -
PACKAGE INFORMATION
Dimension in SOP8 (Unit: mm) Symbol Min Max A 1.350 1.750 A1 0.100 0.250 A2 1.350 1.550 b 0.330 0.510 c 0.170 0.250 D 4.700 5.100 E 3.800 4.000 E1 5.800 6.200 e 1.270(BSC) L 0.400 1.270 θ 0° 8°
AiT Semiconductor Inc. www.ait-ic.com A4057 BATTERY MANAGEMENT LINEAR LI-ION BATTERY CHARGER REV1.2 - FEB 2014 RELEASED, AUG 2021 UPDATED - - 7 - IMPORTANT NOTICE AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. AiT Semiconductor Inc. 's integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT products in such applications is understood to be fully at the risk of the customer. As used herein may involve potential risks of death, personal injury, or server e property, or environmental damage. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. AiT Semiconductor Inc . assumes to no liabil ity to customer product design or application support. AiT warrants the performance of its products of the specifications applicable at the time of sale.