ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 1 d escription the ACE4101 is a 1.6a li \ ion battery switching charger intended for 5v adapters. low power dissipation, an internal mosfet and its compact package with minimum external components requirement makes the ACE4101 ideal for portable applications. the ACE4101 includes complete charge termination circuitry, automatic recharge and a 1% 4.2v/4.35v float voltage. external sense resistor and reverse diode is not need. build \ in thermal feedback mechanism regulates the charge current to control the die te mperature during high power operation or at elevated ambient temperature. battery charge current, charge timeout and end - of \ charge indication parameters can program by external components. additional features include shorted cell detection and overvoltage protection. features ? very low power dissipation ? 1.6a maximum charge current ? standalone capability with no requirement of external mosfet, sense resistor or blocking diode ? constant \ current/constant \ voltage operation with thermal regulation to maximize char ge rate without risk of overheating ? charges single cell li \ ion batteries directly from usb port ? drainage charge current thermal regulation status outputs for led or system interface ? preset 4.2v/4.35v float voltage with 1% accuracy ? automatic recharge app lication ? cellular telephones, pda, mp3 players ? charging docks and cradles ? handheld battery \ powered devices ? handheld computers typical application ACE4101 device parameter should be select as typical application
ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 2 a bsolute maximum ratings p arameter s ymbol m ax u nit input voltage v in 6 .5 v operating junction temperature t j 125 o c ambient temperature t a - 4 0 ~ 85 o c storage temperature t s - 55 ~ 150 o c esd (hbm) >2000 v note: exceed these limits to damage to the d evice. exposure to absolute maximum rating conditions may affect device reliability. packaging type dfn3*3 - 10 dfn3*3 - 10 description function 1 chrg open \ drain charge status output. when the battery is charging, the chrg pin is pulled low by an internal n \ channel mosfet. when the charge cycle is completed, hen the ACE4101 detects an under voltage lockout condition, chrg is forced high impedance 2 iset cha rge current program, monitor the charge current and shutdown. this pin set to 1v in constant \ current mode. the charge current is programmed by connecting a 1% resistor, riset, to gnd pin 3 ctrl sense feedback voltage pin 4 en enable input pin. pulling th e en pin high places the ACE4101 into a low power state where the bat drain current drops to less than 3a and the supply current is reduced to less than 50a. for normal operation, pull the pin low 5 fb battery feedback voltage 6 viin positive supply vo ltage input. this pin connects to the power devices inside the chip. vin ranges from 4v to 5.5v for normal operation. operation down to the under \ voltage lockout threshold is allowed with current limited wall adapters. decouple with a 10f or larger surfac e mounted ceramic capacitor 7 se switch node connection. this pin connects to the drains of the internal main and synchronous power mosfet switches. connect to external inductor 8 gnd ground 9 chrin power path output voltage 10 bat battery charger outp ut terminal. connect a 22f ceramic chip capacitor between bat and pgnd to keep the ripple voltage small chrg 1 10 bat iset 2 9 c hri ctrl 3 8 gnd en 4 7 sw fb 5 6 vin
ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 3 ordering information ACE4101 xx xx + h re commended work conditions item min max unit input voltage range 6 v operating junction t emperature (t j ) - 4 0 85 electrical characteristics ( v dd =5v,t a =25 ) parameter symbol conditions min typ max units adapter/usb voltage range v in 2.6 6 v input supply current i cc charge mode, r iset =10k, standby mode (charge terminated) (note) 300 2000 ua shutdown mode (r iset not connected) 200 500 v cc ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 4 note : supply current includes iset pin current (approximately 100a) but does not include any current delivered to the battery through the bat pin (approximately 100ma). block diagram elect rical performance ( tested under t a =25 , unless otherwise specified )
ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 5 electrical performance ( tested under t a =25 , unless otherwise specified )
ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 6 detailed description general description the ACE4101 is a constant current, constant voltage li \ ion battery switching charger controller. the charge current is set by an external sense resistor (riset) across the iset and gnd pins. the final battery float voltage is internally set to 4.2v/4.35v per cell. for batteries like lithium \ ion that require accurate final float voltage, the internal reference, voltage amplifier and the resistor divider provide regulation with 1% accuracy. a charge cycle begins when the voltage at the vcc pin rises ab ove the uvlo level and is 250mv or more greater than the battery voltage. at the beginning of the charge cycle, if the battery voltage is less than the trickle charge threshold, 2.9v for the 4.2 version, the charger goes into trickle charge mode. the trick le charge current is internally set to 10% of the full \ scale current. the charge current is programmable by setting the value of a precision resistor connected from the iset pin to ground. the charge current is 1000 times of the current out of the iset pin. the program resisto r and the charge current are calculated using the following equations: the charge current out of the bat pin can be determined at any time by monitoring the iset pin voltage using the following equation:
ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 7 when the battery voltage approaches the p rogrammed float voltage, the charge current will start to decrease. it terminates the charge cycle when the charge current falls to 10% of the full \ scale value after the final float voltage is reached. when the iset pin voltage falls below 100mv for longer than tterm (typically 1ms), charging is terminated. the charge current is latched off and the ACE4101 enters standby mode, where the input supply current drops to 200a. (note: c/10 termination is disabled in trickle charging and thermal limiting modes). manual shutdown floating the iset pin by removing the resistor from iset pin to ground can put the device in shutdown mode. the battery drain current is thus reduced to less than 5a and the supply current to less than 50a. reconnecting the resistor back will restart a new charge cycle. once manually shutdown, the chrg pin is in a weak pull \ down state if vin is above uvlo voltage. the chrg pin is in a high impedance state if the ACE4101 is in under voltage lockout mode. automatic recharge after the termina tion of the charge cycle, the ACE4101 constantly monitors the bat pin voltage and starts a new charge cycle when the battery voltage falls below 4.05v, keeping the battery at fully charged condition. chrg output enters a strong pull \ down state during recha rge cycles. inductor selection the peak \ to \ peak ripple is limited to 30% of the maximum output current. this places the peak current far enough from the minimum over current trip level to ensure reliable operation while providing enough current ripples fo r the current mode converter to operate stably. in this case, for 1.6a maximum output current, the maximum inductor ripple current is 667 ma. the inductor size is estimated as following equation: layout considerations c in must be close to pins vin and gnd, the loop area formed by c in and gnd must be minimized. place cchrin as close to pins chrin and gnd. the pcb copper area associated with sw pin must be minimized to avoid the potential noise problem. fb resistors and the traces connecting to the fb pin must not adjacent to the sw net on the pcb layout to avoid the noise problem. iset resistor must be as far away with the sw net as possible. the thermal pad under the ic must be tied to the ground area on the top layer, and use via to connect this ground area to any internal ground planes.
ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 8 packing information dfn3*3 - 10 symbol dimensions in millimeters m in . nom. m ax . a 0.70 0.75 0.80 a1 - 0.02 0.05 b 0.18 0.25 0.30 c 0.18 0.20 0.25 d 2.90 3.00 3 .10 d2 2.4 2.50 2.60 e 0.50bsc nd 2.00bsc e 2.90 3.00 3.10 e2 1.45 1.55 1.65 l 0.30 0.40 0.50 h 0.20 0.25 0.30 l/f (mil) 106*75
ACE4101 max. 1.6a li - ion switching charger ic ver 1. 4 9 notes ace does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ace electronics co., ltd. as sued herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant i nto the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component i s any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ace technology co., ltd. http://www.ace - ele.com/
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