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ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 1 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger part no. marking temp. range package remark EC49020XSMHR ec49020xsmht 49020 lllll yyww x - 40c ~ 85c sop 8l (exposed pad) 1. lllll lot no. 2. yyww date code 3. x v bat_reg =4.2v ec49020 bsmhr ec49020bsmht 49020 lllll yywwb - 40c ~ 85c sop 8l (exposed pad) 1. lllll lot no. 2. yyww date code 3. b v bat_reg =4.35v g eneral description the ec49020 is a 4.5 - 20v input, 2a single - cell synchronous li - ion battery switch i ng charger, sui t able for porta b le application. the ec49020 integrates a synchronous pwm controller, 20v rating power mosfets, current sense resistor, high - accur acy current and voltage regulation, and charge termination, into a compact 8 - pin sop(expose pad) package. features 1.5m hz synchronous switching charger with integrated power fets up to 93% efficiency 20v input rating with 6.7v ovp programmable ( 2a max) charge current built - in charge current soft start built - in reverse current blocking diode built - in charge current sense resistor output short circuit protection over temperature protection available in a sop8( e xpose pad) package applications tablet pc, ebook and netbook handheld portable media products power ban k orderi n g information ec 49020 x x xx x xs : v bat_reg =4.2v bs : v bat_reg =4.35v r : tape reel t : tube mh sop 8l (exposed pad)
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 2 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger pin configuration pin description pin no. pin name description 1 v cc 5v linear regulator output. bypass a 2.2uf ceramic capacitor from v cc to gnd. 2 bat battery connection. connect to the positive terminal of the battery. bypass bat to gnd with a 20uf capacitor. 3 bs high side mosfet gate driver supply. connect a 0.1uf ceramic capacitor from bs to sw to supply the gate drive for the high side mosfets. 4 sw switching node. connect sw to the external inductor. 5 v in ic power supply of internal bias and power devices. bypass 20uf mlcc ceramic capacitor from v in to gnd. 6 ts battery pack ntc monitor. connect ts to the center tap of a resistor divider from v cc to gnd. pull ts to gnd and disable charge function. 7 i set charge current programming input. connect a resistor r iset from i set to gnd to program the charge current. the charge current is programmable from 0.5a to 2a. 8 stat charge status open drain output. stat is pulled low when a charge cycle starts and remains low while charging. stat is high impedance when the charging terminates and when no supply exists. stat i s blinking when ic detect fault conditions. high low blinking charge complete charge in progress fault ep gnd the exposed thermal pad and the ic ground pin.
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 3 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger typical operating circuit electrical characteristics absolute maximum ratings (1) v in , stat to gnd ... - 0.3v~20v junction temperature range, t j - 40c ~ 155c bs to gnd.... - 0.3v~26v storage temperature range, tstg . - 55c ~ 155c sw to gnd.. - 2~20v lead temperature.... 260c v c c , i set , ts, bat to gnd .. - 0.3v~6v thermal information maximum power dissipation(t a =+ 25c )2.4w thermal resistance(j a ) ... 41.3c/w recommend operating conditions (2) input voltage (v in ) .. +4.5v to +6.5v ambient temperature range ... - 40c to + 85c note (1): stress beyond those listed under absolute maximum ratings may damage the device. note (2): the device is not guaranteed to function outside the recommended operating conditions. ec49020
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 4 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger electrical characteristics v in =5v, typical values are at t a = + 25c, with respect to gnd parameter test conditions min typ max units input voltage v in supply operating range 4.5 6.5 v v uvlo under - voltage lockout threshold measure on v in 0v ? 3.3 v v uvlo_hys hysteresis on uvlo measure on v in 4v ? 300 mv v ovp over - voltage rising v in rising 5v ? ovp_hys hysteresis on ovp v in fal ling 7v ? 100 mv automatic sleep comparator (reverse discharging protection) v sleep sleep mode threshold v in C bat fal ling 100 mv v sleep_hys hysteresis v in C bat rising 200 mv quiescent currents i bat battery discharge current pull ts to gnd 25 a i ac adapter supply current v in > v uvlo , v in > v bat , 1.2 2.0 ma v bat >v bat_reg , charge disabled charge voltage regulation v bat_reg bat regulation voltage ec49020xs , measured on bat 0c a a rchg recharge threshold, belowregulation voltage limit 1 cell, measured on bat v bat_reg - v bat 100 mv v lowv trickle charge to fast charge transition threshold measured on bat 2.9 v v ov_bat bat over - voltage threshold as percentage of v bat_reg 104% charge current regulation i out charge current limit v bat(reg) > v bat > v lowv ; i out = k iset /r iset iset = 40k ? ? 2 a k iset fast charge current factor r iset = k iset /i out ; 0.5a v rchg 10 %i out thermistor comparator v ltf cold temperature threshold, ts pin voltage rising threshold charger suspends charge. as percentage to v cc 70.5% 73.5% 76.5% v ltf_hys cold temperature hysteresis, ts pin voltage fal ling as percentage to v cc 0.4 % v htf hot temperature ts pin voltage rising threshold as percentage to v cc 47% v tco cut - off temperature ts pin voltage fal ling threshold as percentage to v cc 41.7% 44.7% 47.7% v off charging disa ble threshold ts pin voltage fal ling edge hysteresis 0.15v 0.15 v internal thermal regulation t j_reg temperature regulation limit charging 125 c
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 5 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger t j(off) thermal shutdown temperature 160 c t j(off - hys) thermal shutdown hysteresis 20 c internal pwm driver fsw pwm switching frequency 1200 1500 1700 khz i ocp_hsfet peak current limit measure on high side fet 4 a r ds_hi high side mosfet on resistance 150 m ? r ds_lo low side mosfet on resistance 75 m ? vcc regulator v cc_reg v cc regulator voltage v in > 6 v, 4.0 5 5.5 v i vcc_lim v cc current limit v cc = 0 v 50 ma functional block diagram
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 6 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger typical performance characte ristics v in = 5v, r iset =50k ? , typical application circuit figure 1, t a = + 25c , unless otherwise noted
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 7 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger typical application circuit figure 1. ec49020 i chg = 2a typical application circuit ec49020
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 8 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger detailed description the ec49020 family is an integrated charger optimized for charging 1 - cell li - ion or li - polymer batteries. it charges a battery with constant current (cc) and constant voltage (cv) profile. the typical charge profile is illustrated in figure 2. figure 2. ec49020 typical charge profile battery charge current regulation the charge current up to 2a is programmed by a resistor r iset from i set to ground. the charge current is calculated by the following equation: the valid resistor range is 40k ? to 200k ? (see table 1.) under high ambient temperature, the charge current will be fold back to keep ic junction temperature not exceeding + 125c. table 1. charge current settings r iset (k ? 50 2.0 66.7 1.5 100 1.0 200 0.5
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 9 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger battery trickle charge current regulation during power - up, if the battery voltage is below the v lowv threshold, the ec49020 only applies the trickle charge current into the battery. this trickle charge feature is intended to revive deeply discharged cells. if the v lowv threshold is not reached within 30 minutes of initiating trickle charge, the charger is turned off, and stat pin blinks to indicate a fault condition. for ec49020 series, the trickle charge current is set as 10% of the full charge current. charge termination the ec49020 monitor the charge current during the battery voltage regulation phase. charge termination is set when the battery voltage is higher than recharge threshold v rch and the charge current is less than 10% of the full charge current. recharge a new charge cycle is initiated when one of the following conditions occurs: the battery voltage falls below the recharge threshold input supply v in power - on - reset (por) event occurs ts pin is toggled below 0.15v (disable charging) and above 0.3v (enable charging) . charge current soft start the ec49020 soft starts the charge curr ent to ensure no overshoot or stress on the output capacitors or the power converter. the thermistor input ts the ec49020 continuously monitors battery temperature by measuring the voltage between the ts pin and gnd. a negative temp erature coefficient thermistor (ntc) and an external voltage divider typically develop this voltage. the ec49020 compares this voltage against its internal thresholds to determine if charging is allowed. to initiate a charge cycle, the battery temperature must be within the v ltf to v htf thresholds. if battery temperature is outside of this range, the ec49020 suspends charge and waits until the battery temperature is within the v ltf to v htf range. during the charge cycle the battery temperature must be within the v ltf to v tco threshold. figure 3. thermistor input ts pin threshold
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 10 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger refer to ec49020 typical operating circuit. rthhot is the expected thermistor resistance at the programmed hot threshold, and rthcold is the expected thermistor resistance at the programmed cold threshold. the values of r3 and r4 can be determined by using below equations. where: v ltf = 0.735 x v cc v tco = 0.447 x v cc pcb layout consideration for the best efficiency and minimum noise problem, place c in , c6, c7, c2, l, r iset , r3 and r4 close to the ic. maximize the pcb copper area connecting to gnd pin to achieve the best therma l and noise performance. if the board space allowed, a ground plane is highly desirable. c in must be close to pins in and gnd. the loop area formed by c in and gnd must be minimized. the pcb copper area associated with sw pin must be minimized to avoid the potential noise problem.
ec49020 4d25n - rev.p001 e - c m o s c o r p . ( ww w . e c m o s . c o m . t w ) p a g e 11 o f 11 high efficiency 2a 1.5mhz single cell li - ion battery switching charger p ackaging i nformation ec49020 sop 8l 150mils(ep) package outline dimensons

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