RT9513 Linear Single Cell Li-Ion Battery Charger IC General Description Features The RT9513 is a fully integrated low cost single-cell LiIon battery charger IC ideal for portable applications. The RT9513 is capable of being powered up from AC adapter. The RT9513 enters sleep mode when AC adapter is removed. z The RT9513 optimizes the charging task by using a control algorithm including preconditioning mode, fast charge mode and constant voltage mode. The charging task is terminated as the charge current drops below the preset threshold. The AC adapter charge current can be programmed up to 1A with an external resister. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. z z z z z z z z z 18V Maximum Rating for AC Adapter Internal Integrate P-MOSFETs AC Adapter Power Good Status Indicator Charge Status Indicator Under Voltage Protection Over Voltage Protection Automatic Recharge Feature Small 10-Lead WDFN Package Thermal Feedback Optimizing Charge Rate RoHS Compliant and Halogen Free Applications z z Digital Cameras Cellular Phones Personal Data Assistants (PDAs) MP3 Players Hand Held PCs The RT9513 features 18V maximum rating voltages for AC adapter. The other features are under voltage protection, over voltage protection for AC adapter supply. z Ordering Information Pin Configurations z z (TOP VIEW) Package Type QW : WDFN-10L 3x3 (W-Type) ACIN 1 NC 2 Lead Plating System G : Green (Halogen Free and Pb Free) Richtek products are : ` ` 9 GND CHG_S 3 PGOOD 4 GND 5 Note : BATT NC 8 EN 7 NC ISETA 10 11 9 RT9513 WDFN-10L 3x3 RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Marking Information Suitable for use in SnPb or Pb-free soldering processes. For marking information, contact our sales representative directly or through a Richtek distributor located in your area. Typical Application Circuit To System To System DS9513-01 April 2011 1 RT9513 10 BATT ACIN 1uF 3 CHG_S EN 4 PGOOD 5, GND Exposed Pad (11) ISETA 8 6 + Battery Pack AC Adapter Chip Shutdown Chip Enable RSET www.richtek.com 1 RT9513 Functional Pin Description Pin No. Pin Nam e Pin Function ACIN Wall Adaptor Charge Input Supply. NC No Internal Connection. 3 CHG_S Charge Status Indicator Output (open drain). 4 PGOOD Power Good Indicator Output (open drain). 5 GND Ground. 6 ISETA Wall Adaptor Supply Charge Current Set Point. 8 EN Charge Enable Input (active low). 10 BATT Battery Charge Current Output. 1 2, 7, 9 Ground. The exposed pad must be soldered to a large PCB and connected to Exposed Pad (11) GND GND for maximum power dissipation. Function Block Diagram ACIN OVP Comparator 2.5V + Charge Input Selection GND OVP SENSE FET ACIN PFET ISETA BATT 2.5V VREF 0.5V Thermal Sense 115 C Precharge Comparator + 2.5V - + - 0.25V V/I Precharge 2.5V + - Recharge Comparator + V/I 2.5V - Recharge 0.25V 2.5V Current Amplifier VCC Precharge + - Tcrmination Comparator 0.25V + 0.9V + Voltage Amplifier Charge Done Charge Disable PGOOD Logic CHG_S 1uA EN www.richtek.com 2 DS9513-01 April 2011 RT9513 Table RT9513 Flow Chart Start-Up Precharge Phase Fast Charge Phase Standby/Fault Recharge Phase UVP / OVP DISABLE ACIN Power Up DISABLE MODE P-MOSFET OFF IBATT = 0 YES V EN > 1.4V ? NO V ACIN > 6.5V or V ACIN < 4.4V? OVP/UVP MODE P-MOSFET OFF IBATT = 0 YES NO SLEEP Start-Up SLEEP MODE P-MOSFET OFF IBATT = 0 YES V ACIN < V BATT ? NO 1ms Delay V TS > 2.5V or V TS < 0.5V? RECHARGE NO YES V BATT > 2.8V? NO IBATT = 0.1 Charge Current /CHG_S Pull Down YES IBATT = Charge Current /CHG_S Pull Down YES STANDBY PFET OFF V BATT = 4.2V, IBATT = 0 NO YES V BATT > 4.1 V? NO V BATT ~ 4.2V, IBATT < 0.1 ICHG? DS9513-01 April 2011 www.richtek.com 3 RT9513 Absolute Maximum Ratings z z z z z z z z z (Note 1) AC Input Voltage ----------------------------------------------------------------------------------------------------------EN Input Voltage ----------------------------------------------------------------------------------------------------------Output Current ------------------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C WDFN-10L 3x3 ------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2) WDFN-10L 3x3, θJA ------------------------------------------------------------------------------------------------------WDFN-10L 3x3, θJC ------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ---------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 3) HBM (Human Body Mode) ---------------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------------ Recommended Operating Conditions z z −0.3V to 18V −0.3V to 6V 1.2A 0.926W 108°C/W 8.2°C/W 260°C 150°C −65°C to 150°C 2kV 200V (Note 4) Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C Electrical Characteristics (ACIN = 5V, TA = 27°C, Unless Otherwise specification) Parameter Symbol Test Conditions Min Typ Max Units 4.5 -- 6 V ACIN UVP Rising Threshold Voltage VUV_HIGH -- 4.4 4.5 V ACIN UVP Hysteresis VUV_LOW 50 80 120 mV ACIN Standby Current ISTBY V BATT = 4.5V -- 300 500 μA ACIN Shutdown Current ISHDN V EN = HIGH -- 50 100 μA ACIN UVP Current IUVP V ACIN = 4V, V BATT = 3V -- 150 250 μA BATT Sleep Leakage Current ISLEEP V ACIN = 4V, V BATT = 4.5V -- -- 10 μA VREG IBATT = 60mA 4.158 4.2 4.242 V −1 -- +1 % Supply Input ACIN Input Voltage Range VACIN Voltage Regulation BATT Regulation Voltage Regulation Voltage Accuracy ACIN MOSFET RDS(O N)_ACIN IBATT = 500mA -- 600 -- mΩ Current Regulation ISETA Set Voltage (Fast Charge Phase) VISETA VBATT = 3.5V 2.45 2.5 2.55 V Full Charge Setting Range ICHG_AC 100 -- 1200 mA AC Charge Current accuracy ICHG_AC -- 500 -- mA VBATT = 3.8V, RISET = 1.5kΩ To be continued www.richtek.com 4 DS9513-01 April 2011 RT9513 Parameter Symbol Test Conditions Min Typ Max Units Precharge BATT Pre-Charge Rising Threshold VPRECH 2.6 2.8 3 V BATT Pre-Charge Threshold Hysteresis Pre-Charge Current ΔV PRECH 50 100 200 mV IPCHG V BATT = 2V 8 10 12 % BATT Re-Charge Falling Threshold Hysteresis Charge Termination Detection ΔV RE CH_L V REG − VBATT 60 100 150 mV Termination Current Ratio (default) ITERM V BATT = 4.2V -- 10 -- % CHG_S Pull Down Voltage VCHG_S TBD, ICHG_S = 5mA -- 65 -- mV PGOOD Pull Down Voltage VPGOOD TBD, IPGO OD = 5mA -- 220 -- mV Recharge Threshold Logic Input/Output EN Threshold Logic-High Voltage VIH 1.5 -- -- V Logic-Low Voltage VIL -- -- 0.4 V -- -- 2 μA -- 125 -- °C -- 6.5 -- V EN Pin Input Current IEN V EN = 2V Protection Thermal Regulation OVP SET Internal Default Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. θJA is measured in the natural convection at TA = 25°C on a high effective thermal conductivity test board (4 layers, 1S) of JEDEC 51-7 thermal measurement standard. The case point of θJC is on the expose pad for the package. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. DS9513-01 April 2011 www.richtek.com 5 RT9513 Typical Operating Characteristics ACIN Power On ACIN Power Off VACIN (5V/Div) VACIN (5V/Div) VBATT (2V/Div) VBATT (2V/Div) CHG_S (5V/Div) CHG_S (5V/Div) I CHARGE (0.5A/Div) I CHARGE (0.5A/Div) VBATT = 3.7V VBATT = 3.7V Time (250μs/Div) Time (500μs/Div) ACIN OVP ACIN OVP V OUT V OUT VACIN (5V/Div) VBATT (2V/Div) VBATT (2V/Div) VACIN (5V/Div) V IN CHG_S (5V/Div) CHG_S (5V/Div) I CHARGE (0.5A/Div) V IN ACIN = 0V to 10V, VBATT = 3.7V I CHARGE (0.5A/Div) ACIN = 5V to 8V to 5V, VBATT = 3.7V Time (1ms/Div) Time (1ms/Div) Input Voltage Transition Input Voltage Transition ACIN Power On ACIN Power Off VACIN (5V/Div) VACIN (5V/Div) CHG_S (5V/Div) CHG_S (5V/Div) I CHARGE (1A/Div) I CHARGE (1A/Div) VBATT = 3.7V VBATT = 3.7V Time (500μs/Div) www.richtek.com 6 Time (500μs/Div) DS9513-01 April 2011 RT9513 Application Information Automatically Power Source Selection Fast-Charge Current Setting The RT9513 is a battery charger IC which is designed for Li-ion Battery with 4.2V rated voltage. The RT9513 offers ISETA pin to determine the AC charge rate from 100mA to 1.2A. The charge current can be calculated as following equation. AC Mode : When the AC input voltage (ACIN) is higher than the UVP voltage level (4.4V), the RT9513 will enter AC Mode. In the AC Mode, ACIN P-MOSFET is turned on and USB P-MOSFET is turned off. Sleep Mode : The RT9513 will enter Sleep Mode when AC input voltage are removed. This feature provides low leakage current from the battery during the absence of input supply. ACIN Over Voltage Protection The AC input voltage is monitored by an internal OVP comparator. The comparator has an accurate reference of 2.5V from the band-gap reference. The OVP threshold is set by the internal resistive. The protection threshold is set to 6.5V. When the input voltage exceeds the threshold, the comparator outputs a logic signal to turn off the power P-MOSFET to prevent the high input voltage from damaging the electronics in the handheld system. When the input over oltage condition is removed (ACIN < 6V), the comparator re-enables the output by running through the soft-start. Icharge_ac = K SET VSET RSETA The parameter KSET = 300 ; VSET = 2.5V. RSETA is the resistor connected between the ISETA and GND. Pre- Charge Current Setting During a charge cycle if the battery voltage is below the VPRECH threshold, the RT9513 applies a pre-charge mode to the battery. This feature revives deeply discharged cells and protects battery life. The RT9513 internal determines the pre-charge rate as 10% of the fast-charge current. Battery Voltage Regulation The RT9513 monitors the battery voltage through the BATT pin. Once the battery voltage level closes to the VREG threshold, the RT9513 voltage enters constant phase and the charging current begins to taper down. When battery voltage is over the VREG threshold, the RT9513 will stop charge and keep to monitor the battery voltage. However, when the battery voltage decreases 100mV below the VREG, it will be recharged to keep the battery voltage. 1200 Charge Status Outputs Charge Current (mA) 1000 The open-drain CHG_S and PGOOD outputs indicate various charger operations as shown in the following table. 800 These status pins can be used to drive LEDs or communicate to the host processor. Note that ON indicates the open-drain transistor is turned on and LED is bright. 600 400 200 Charge State 0 0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 RSETA (kΩ) 9.5 ACIN CHG_S PGOOD Charge ON ON Charge done OFF ON Figure 1. AC Mode Charge Current Setting DS9513-01 April 2011 www.richtek.com 7 RT9513 Temperature Regulation and Thermal Protection In order to maximize the charge rate, the RT9513 features a junction temperature regulation loop. If the power dissipation of the IC results in a junction temperature greater than the thermal regulation threshold (125°C), the RT9513 throttles back on the charge current in order to maintain a junction temperature around the thermal regulation threshold (125°C). The RT9513 monitors the junction temperature, TJ, of the die and disconnects the battery from the input if TJ exceeds 125°C. This operation continues until junction temperature falls below thermal regulation threshold (125°C) by the hysteresis level. This feature prevents the chip from damage. Selecting the Input and Output Capacitors In most applications, the most important is the high-frequency decoupling capacitor on the input of the RT9513. A 1uF ceramic capacitor, placed in close proximity to input pin and GND pin is recommended. In some applications depending on the power supply characteristics and cable length, it may be necessary to add an additional 10uF ceramic capacitor to the input. The RT9513 requires a small output capacitor for loop stability. A 1uF ceramic capacitor placed between the BATT pin and GND is typically sufficient. Layout Consideration The RT9513 is a fully integrated low cost single-cell Li- Ion battery charger ideal for portable applications. Careful PCB layout is necessary. For best performance, place all peripheral components as close to the IC as possible. A short connection is highly recommended. The following guidelines should be strictly followed when designing a PCB layout for the RT9513. ` Input capacitor should be placed close to IC and connected to ground plane. The trace of input in the PCB should be placed far away the sensitive devices or shielded by the ground. ` The GND should be connected to a strong ground plane for heat sinking and noise protection. ` The connection of RSETA should be isolated from other noisy traces. The short wire is recommended to prevent EMI and noise coupling. ` Output capacitor should be placed close to IC and connected to ground plane to reduce noise coupling. The capacitor should be placed close to IC pin and connected to ground plane. C1 C3 ACIN 1 10 BATT NC 2 9 NC CHG_S 3 8 EN PGOOD 4 7 NC GND 5 9 ISETA GND RSETA GND The GND should be connected to a strong ground plane for heat sinking and noise protection. The connection of R SETA should be isolated from other noisy traces. The short wire is recommended to prevent EMI and noise coupling. Figure 2 www.richtek.com 8 DS9513-01 April 2011 RT9513 Outline Dimension D2 D L E E2 1 e SEE DETAIL A 2 b A3 Symbol 2 1 DETAIL A Pin #1 ID and Tie Bar Mark Options A A1 1 Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010 b 0.180 0.300 0.007 0.012 D 2.950 3.050 0.116 0.120 D2 2.300 2.650 0.091 0.104 E 2.950 3.050 0.116 0.120 E2 1.500 1.750 0.059 0.069 e L 0.500 0.350 0.020 0.450 0.014 0.018 W-Type 10L DFN 3x3 Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 5F, No. 95, Minchiuan Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)86672399 Fax: (8862)86672377 Email: [email protected] Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek. DS9513-01 April 2011 www.richtek.com 9