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september 2006 rev. 1 1/17 17 STC4054 800ma standalone linear li-ion battery charger with thermal regulation feature summary programmable charge current up to 800ma no external mosfet, sense resistors or blocking diode required constant current / constant voltage operation with thermal regulation to maximize charge rate without risk of overheating charges single cell li-ion batteries directly from usb port preset 4.2v charge voltage with 1% accuracy automatic recharge single charge status output pin charge current monitor output for gas gauging c/10 charge termination 25a supply current in shutdown mode low battery voltage detect for precharge setting soft-start limits inrush current tsot23-5l package applications cellular telephones pdas bluetooth applications battery-powered devices description the STC4054 is a constant current/constant voltage charger for single cell li-ion batteries. no external sense resistor or blocking diode is required and its thinsot package make it ideally suited for portable applications. the STC4054 is designed to work within usb power specifications. an internal block regulates the current when the junction temperature increases, in order to protect the device when it operates in high power or high ambient temperature. the charge voltage is fixed at 4.2v, and the charge current limitation can be programmed using a single resistor connectd between prog pin and gnd. the charge cycle is automatically terminated when the current flowing to the battery is 1/10 of the programmed value. if the external adaptor is removed, the STC4054 turns off and a 2a current can flow from the battery to the device. the device can be put into shutdown mode, reducing the supply current to 25a. the device also has a charge current monitor, under voltage lockout, automatic recharge. the device is packaged in tsot23-5l. tsot23-5l www.st.com order code part number package packaging STC4054gr tsot23-5l 3000 parts per reel
STC4054 2/17 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1 charge cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.2 v cc pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.3 power on pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.4 chrg pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.5 prog pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.6 programming charge current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.7 bat pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.8 charge termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.9 automatic recharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.10 soft start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.11 thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.12 power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.13 stability considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
STC4054 block diagram 3/17 1 block diagram figure 1. block diagram
pin configuration STC4054 4/17 2 pin configuration figure 2. pin connections (top view) table 1. pin description pln n symbol note 1 chrg open drain. this pin goes in low impedance when the STC4054 is in precharge or charge mode 2 gnd ground pin 3bat this pin provides an accurate 4.2v output voltage and the charge current to the battery. only 2a reverse current can flow in to the device when in shutdown mode 4v cc input supply voltage. the input range is from 4.25v to 6.5v. if v cc STC4054 maximum ratings 5/17 3 maximum ratings table 2. absolute maximum ratings symbol parameter value unit v cc input supply voltage from -0.3 to 10 v v bat bat pin voltage from -0.3 to 7 v v prog prog pin voltage from -0.3 to v cc +0.3 v v chrg chrg pin voltage from -0.3 to 7 v i bat bat pin current 800 ma i prog prog pin current 800 a bat short circuit duration continuous p d power dissipation internally limited mw t j max junction temperature 125 c t stg storage temperature range -65 to 125 c t op operating junction temperature range -40 to 85 c table 3. thermal data symbol parameter value unit r thjc thermal resistance junction-case 81 c/w r thja thermal resistance junction-ambient 255 c/w
electrical characteristics STC4054 6/17 4 electrical characteristics table 4. electrical characteristics (v cc = 5v, c i = 1f, t j = -40 to 85 unless otherwise specified) ( note 1 ). symbol parameter test min. typ. max. unit v cc supply voltage 4.25 6.5 v i cc supply current ( note 2 ) charge mode, r prog =10k ?, v bat = 3.5v 150 500 a standby mode (charge terminated) 150 300 shutdown mode r prog not connected 21 40 v cc < v bat 17 50 v cc < v uv 17 40 v bat termination output voltage v cc = 4.3v to 6.5v, r prog =10k ? 4.158 4.2 4.242 v i bat bat pin current current mode r prog =10k ? 90 100 110 ma current mode r prog =2k ? 465 500 535 ma standby mode v bat =4.2v 0 -2.5 -6 a shutdown mode (r prog not connected), t j =25c 1 2a sleep mode, v cc =0v, t j =25c 1 2a i pre pre-charge current v bat <2.8v r prog =2k ? t j =25c 20 45 70 ma v pre pre-charge threshold r prog =10k ? v bat falling 2.8 2.9 3.0 v hysteresis r prog =10k ? 70 100 130 mv v uv v cc undervoltage lockout v cc low to high r prog =10k ? 3.7 3.8 3.9 v hysteresis r prog =10k ? 50 180 300 mv v msd manual shutdown threshold prog pin rising 1.15 1.21 1.30 v prog pin falling 0.85 0.95 1.05 v asd v cc -v bat lockout threshold v cc low to high t j =25c r prog =10k ? 50 85 120 mv v cc high to low t j =25c r prog =10k ? 53050 i term c/10 termination current threshold (i bat /i batc10 ) ( note 3 ) r prog =10k ? 0.1 ma/ma r prog =2k ? 0.1 v prog prog pin voltage current mode r prog =10k ? 0.93 1.0 1.07 v i chrg chrg pin current weak pull-down v chrg =5v, v bat =4.3v, r prog =10k ? 82035a v chrg chrg pin pull-down voltage i chrg =5ma 0.35 0.6 v ? v rechrg recharger battery threshold voltage v float -v rechrg , t j =25c r prog =10k ? 200 mv
STC4054 electrical characteristics 7/17 note: 1 the STC4054 was tested using a battery simulator and an output capacitor value about 4.7f 2 supply current includes prog pin current but not include any current delivered to the battery through the v bat pin 3i term is expressed as a fraction of measured full charge current with indicated prog resistor 4 guaranteed by design t lim junction temperature in constant current mode 120 c r on power fet ?on? resistance (between v cc and bat) 600 m ? t ss soft-start time i bat =0 to i bat =1000v/r prog 100 s t recharge recharge comparator filter time note 4 v bat high to low 0.75 2 4.5 ms t term termination comparator filter time note 4 i bat falling below i chg /10 400 1000 2500 s i prog prog pin pull-up current 1 a table 4. electrical characteristics (v cc = 5v, c i = 1f, t j = -40 to 85 unless otherwise specified) ( note 1 ). symbol parameter test min. typ. max. unit
typical performance characteristics STC4054 8/17 5 typical performance characteristics figure 4. i bat vs supply voltage figure 5. v bat vs v cc figure 6. i bat vs temperature figure 7. v prog vs temperature figure 8. i bat /i prog vs temperature figure 9. i bat vs v prog
STC4054 typical performance characteristics 9/17 figure 10. i bat /i prog vs v cc figure 11. v chrg vs temperature (chrg pin output low voltage) figure 12. i chrg vs temperature (chrg pin weak pull down current) figure 13. power fet ?on? resistance figure 14. i bat vs v bat figure 15. recharge battery threshold voltage vs. temperature
application information STC4054 10/17 6 application information the STC4054 uses an internal p-channel mosfet to work in constant current and constant voltage method. it is able to provide up to 800ma with a final regulated output voltage of 4.2v 1% in full temperature range. no blocking diode and sensing resistor are required. it is also possible to use an usb port as power supply voltage. 6.1 charge cycle a charge cycle begins when the voltage at the v cc pin rises above the uvlo threshold level, the r prog program resistor of 1% is connected between the prog pin to gnd pin and when a battery is connected to the charger output. if the battery voltage is below 2.9v, the charger enters in trickle charge mode. in this condition, the device supplies 1/10 of the programmed charge current to bring the battery voltage up to safe level otherwise the life of a battery is reduced. if the bat pin voltage is higher than 2.9v the charger enters in constant current mode. when the bat pin voltage is close to the final float voltage (4.2v) the device enters in constant voltage mode and the charge current begins to decrease. the charge cycle is terminated when the current drops to 1/10 of the programmed value. 6.2 v cc pin input supply voltage. this pin is used to supplie the device in the range from 4.25v to 6.5v voltage. a bypass capacitor of 1f is recommended for use. when v cc value drops of 30mv of the bat pin voltage, the device enters in shutdown mode, dropping i bat to less than 2a. 6.3 chrg pin this is a flag open drain. it indicates three different status of the output. when the charge is in progress this pin is pulled low instead at the end of the charge cycle, a weak pull down of approximately 20a is connected to the chrg pin, indicating a present supply power; if the flag is forced high impedance an under voltage condition is detected. 6.4 prog pin charge current program, charge current monitor and shutdown pin. the charge current is programmed by connecting a 1% resistor, r prog , to ground. when the device is charging in constant current, the value of voltage on this pin is 1.0v. in other conditions, the voltage on this pin can be used to measure the charge current using the following formula: i bat = (v prog /r prog )*1000 the prog pin is used to shut down the device, disconnecting the program resistor from ground a 1a current flows to pull the prog pin high. if the value of this pin is 1.21v (shutdown threshold voltage), the device enters shutdown mode and the input supply current drops to 25a. driving this pin to voltage beyond 2.4v a current of 35a flows into the device from prog pin.
STC4054 application information 11/17 6.5 programming charge current the r prog resistor is used to set the charge current value. the battery charge current is 1000 times the prog pin current value. the program resistor and the charge current are calculated using the following formula: r prog =1000*v prog /i bat ; the charge current out of the bat pin can be monitored through the prog pin voltage using the following equation: i bat =(v prog /r prog )x1000 6.6 charge status indicator (chrg) the charge status output has three different states: strong pull-down (~10ma), weak pull- down (20a) and high impedance. the strong pull-down indicates that the device is charging the battery. weak pull-down indicates that v cc meets the uvlo conditions and the device is ready to charge. the last status high impedance indicates an insufficient voltage is applied to the v cc pin or the voltage on v cc is less than 100mv above the bat pin voltage. 6.7 bat pin charge current output pin. it provides charge current to the battery and regulates the final float voltage to 4.2v. an internal precision resistor is used as a feedback loop to compare the v o with the reference. 6.8 charge termination a charge cycle is terminated when the final float voltage is reached consequently the charge current falls to 1/10th of the programmed value. the charge is over when the prog pin voltage falls below 100mv for longer time than t term (~1ms). the charge current is latched off, the device enters in standby mode and the input supply current drops to 200a. 6.9 automatic recharge the device restarts the charge cycle when the battery voltage falls below 4.05v to maintain the battery capacity value higher than 80%. during the recharge time, the chrg pin goes low state. 6.10 soft start when a charge cycle starts, a internal soft start circuit minimizes the inrush current. at starting phase, the charge current ramps from zero to the full scale in a 100s period time.
application information STC4054 12/17 6.11 thermal regulation an internal thermal feedback loop reduces the output current if the die temperature attempts to rise above a present value of approximately 120c. this feature protects the device from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the device. 6.12 power dissipation it is very important to use a good thermal pc board layout to maximize the available output current. the thermal path for the heat generated by the ic is from the die to the copper lead frame through the package leads and exposed pad to the pc board copper. the pc board copper is the heat sink. the footprint copper pads should be as wide as possible and expand out to larger copper areas to spread and dissipate the heat to the surrounding ambient. feed through vias to inner or backside copper layers are also useful in improving the overall thermal performance of the device. other heat sources on the board, not related to the device, must also be considered when designing a pc board layout because they will affect overall temperature rise and the maximum output current. 6.13 stability considerations the STC4054 contains two control loops: constant voltage and constant current. the constant-voltage loop is stable without any compensation when a battery is connected with low impedance leads. excessive lead length, however, may add enough series inductance to require a bypass capacitor of at least 1f from bat to gnd. furthermore, a 4.7f capacitor with a 0.2 ? to 1 ? series resistor from bat to gnd is required to keep ripple voltage low when the battery is disconnected.
STC4054 package mechanical data 13/17 7 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com.
package mechanical data STC4054 14/17 dim. mm. mils min. typ max. min. typ. max. a 1.1 43.3 a1 0 0.1 3.9 a2 0.7 1.0 27.6 39.4 b 0.3 0.5 11.8 19.7 c 0.08 0.2 3.1 7.9 d 2.9 114.2 e 2.8 110.2 e1 1.6 63.0 e0.95 37.4 e1 1.9 74.8 l 0.3 0.6 11.8 23.6 tsot23-5l mechanical data 7282780b
STC4054 package mechanical data 15/17 dim. mm. inch min. typ max. min. typ. max. a 180 7.086 c 12.8 13.0 13.2 0.504 0.512 0.519 d 20.2 0.795 n 60 2.362 t 14.4 0.567 ao 3.13 3.23 3.33 0.123 0.127 0.131 bo 3.07 3.17 3.27 0.120 0.124 0.128 ko 1.27 1.37 1.47 0.050 0.054 0.0.58 po 3.9 4.0 4.1 0.153 0.157 0.161 p 3.9 4.0 4.1 0.153 0.157 0.161 tape & reel sot23-xl mechanical data
revision history STC4054 16/17 8 revision history table 5. revision history date revision changes 04-sep-2006 1 initial release.
STC4054 17/17 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in military, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or register ed trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2006 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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