Preliminary Datasheet LP28007 Single and Dual Cell Li+ Battery Charger IC –LP28007 General Description Features The LP28007 is a fully integrated low cost single-cell Li-Ion battery charger IC ideal for portable applications. The LP28007 is capable of being powered up from AC adapter. The LP28007 enters sleep mode when AC adapter is removed. The LP28007 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. The LP28007 features 18V maximum rating voltages for AC adapter. The other features is under voltage protection. □ □ □ □ Internal Integrate P-MOSFETs AC Adapter Power Good Status Indicator Charge Status Indicator Under Voltage Protection Automatic Recharge Feature Battery Temperature Monitoring Small 8-Lead MSOP(EP) Package Thermal Feedback Optimizing Charge Rate ROHS Compliant and 100% Lead (Pb)-Free Typical Application Circuit Order Information LP28007 18V Maximum Rating for AC Adapter 8.4V Li-Ion Battery Pack □ F: Pb-Free Package Type MS: MSOP-8 Output Voltage 42: 4.2V 84: 8.4V Applications Portable Media Players/MP3 players Cellular and Smart mobile phone PDA/DSC Bluetooth Applications Marking Information Device Marking Package Shipping LP28007 LPS SP:MSOP-8 3K/REEL LP28007 XXXX LP28007 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 1 of 11 Preliminary Datasheet LP28007 Functional Pin Description P ac k age T y pe P in C onf ig ur at i ons ACIN 1 8 BATT CHG_S 2 EMSOP- 8 9 PGOOD 3 PGND 7 NC 6 EN 5 ISETA GND 4 Pin Description P in N o P in N ame P in F unc t ion 1 AC I N Wall Adapt or C har ge I nput Supply . 2 C H G_ S C har ge St at us I ndic at or O ut put (O pen Dr ain) . 3 PG O OD Pow er G ood I ndic at or O ut put ( O pen dr ain). 4 GND G r ound. 5 I SET A Wall Adapt or s upply c har ge c urr ent Set point . 6 EN C har ge Enable I nput ( ac t iv e low ) . 7 NC N o I nt er nal C onnec t ion. 8 BAT T Bat t er y C har ge C ur r ent O ut put . T his pin pr ov ides c har ge c urr ent t o t he bat t er y and r egulat es t he f inal f loat v olt age t o 4. 2 or 8. 4V. An int er nal pr ec is ion r es is t or div ider fr om t his pin s et s t he f loat v olt age w hic h is dis c onnec t ed in s hut dow n mode. 9( Ex pos ed Pad) PG N D Ex pos ed Pad Should be s older ed t o PC B Boar d and C onnec t ed t o G N D . Note: LP28007-42MSF and LP28007-84MSF of Battery (Pin8) is output pin, the pin connects to Battery. LP28007 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 2 of 11 Preliminary Datasheet LP28007 Function Block Diagram LP28007 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 3 of 11 Preliminary Datasheet LP28007 – 02 May.-2013 Email: [email protected] LP28007 www.lowpowersemi.com Page 4 of 11 Preliminary Datasheet LP28007 – 02 May.-2013 Email: [email protected] LP28007 www.lowpowersemi.com Page 5 of 11 Preliminary Datasheet LP28007 Absolute Maximum Ratings (Notes 1.2) VIN ,VBATT ,VCHGSB ,VPGOOD,VEN ----------------------------------------------------------------------------- -0.3V to 18V Storage Temperature Range-------------------------------------------------------------------------- -65℃ to 150℃ VISETA ------------------------------------------------------------------------------------------------------------------------ -0.3V to 3.6V Junction Temperature (TJ )--------------------------------------------------------------------------------------- 150℃ Lead Temperature (soldering, 10 sec.) ------------------------------------------------------------------------------------------ 260℃ Operating Ratings (Note 1, 2) Supply Voltage --------------------------------------------------------------------------------------------------------- 4.5V to 13.5V Thermal Resistance(θJA, Note 3)) --------------------------------------------------------------------------------------------20℃/W Operating Temperature Range ----------------------------------------------------------------------------- -40℃ to 85℃ Thermal Resistance(θJA , Note 4)) ------------------------------------------------------------------------------------------- 8.5℃/W Electrical Characteristics (TA=25℃, VIN=10V; unless otherwise specified.) Symbol VIN Parameter Input Operating Conditions Min Voltage 9 Range Charge Mode. RSET=30K Standby Mode (Charge Icc Terminated) Input Supply Current Typ Max Units 15 V 300 uA 250 UA 190 uA Shutdown Mode (RSET Not Connected VIN < VBATT or VIN < Vuv) VFLOAT Regulated Output(Float) 0℃ ≦ TA ≦ 85℃ 8.316 Voltage RSET=1.5k,Current Mode RSET=0.75k,Current Mode IBATT BATT Pin Current Trickle Charge Current LP28007 – 02 Trickle Charge Threshold 500 mA 1000 mA 0 1 uA Shutdown Mode -1 0 1 uA Sleep Mode, VIN=0V -1 0 1 uA RSET=1.5K VBATT<VTRICKLE, RSET=1.5K, VBATT Rising Voltage May.-2013 V -1 RSET=0.75K VTRICKLE 8.484 Standby Mode, VBATT=8.4V VBATT<VTRICKLE, ITRICKLE 8.4 Email: [email protected] 60 mA 120 mA 5.8 V www.lowpowersemi.com Page 6 of 11 Preliminary Datasheet V TRHYS VMSD VASD ITERM VSET ICHG_SB VCHG_SB VPGOOD Trickle Charge Hysteresis LP28007 RSET=1.5K Voltage 250 mV Manual Shutdown Threshold ISETA Pin Rising 2.15 V Voltage ISETA Pin Falling 2.05 V VIN – VBATT Lockout Vin from High to Low 30 mV Threshold Voltage Vin from Low to High 60 mV C/10Termination Current RSET=1.5K 0.1 mA/ mA Threshold RSET=0.75K 0.1 mA/ mA ISETA pin Voltage RSET=1.5K,Current Mode 1.5 V CHG_SB Pin Weak Pull-Down VCHG_SB=5.0V 25 uA 0.35 V 0.35 V Current CHG_SB Pin Output Low ICHG_SB=5mA Voltage PGOOD Pin Output Low IPGOOD_SB=5mA Voltage 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 ∆VPRECH 50 100 200 mV Pre-Charge Current IPCHG 8 10 12 % 60 100 150 mV -- 10 -- % -- 65 -- -- 220 -- mV VIH 1.5 -- -- V VIL -- -- 0.4 V VBATT=2V Recharge Threshold BATT Pre-Charge Falling Threshold Hysteresis ∆VPRECH_L VREG – VBATT Charge Termination Detection Termination Current Ratio(default) ITERM VBATT=4.2V Logic Input/Output ______________ PGOOD Pull Down Voltage Logic-High Voltage ______ EN Threshold Logic-Low Voltage ______ EN Pin Input Current VCHG_S TBD, ICHG_S=5mA VPGOOD TBD, IPGOOD=5mA _________________ C HG_ S Pull Down Voltage IEN IEN=2V -- -- 2 -- 125 -- mV μA Protection Thermal Regulation LP28007 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com ℃ Page 7 of 11 Preliminary Datasheet LP28007 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℃ 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. VSET VS. Temperature (VBATT > 5.8V) VSET VS. Temperature (VBATT ＜ 5.8V) Charge Current VS.Battery Voltage(VIN=10V) Charge Current VS.VIN(VBATT=8.0V) Rset=3k Regulated Output Voltage vs.Supply Voltage LP28007 – 02 May.-2013 Regulated Output Voltage vs.Temperature Email: [email protected] www.lowpowersemi.com Page 8 of 11 Preliminary Datasheet LP28007 Application Information Automatically Power Source Selection Battery Voltage Regulation The LP28007 is a battery charger IC which is designed The LP28007 monitors the battery voltage through the for Li-ion Battery with 4.2V rated voltage. BATT pin. Once the battery voltage level closes to the ACIN Mode : When the ACIN input voltage is higher VREG threshold, the LP28007 voltage enters constant than the UVP voltage level (4.4V), the LP28007 will phase and the charging current begins to taper down. turn on ACINP-MOSFET. Sleep Mode : The LP28007 When battery voltage is over the VREG threshold, the will enter Sleep Mode when ACIN input voltage are LP28007 will stop charge and keep to monitor the removed. This feature provides low leakage current battery voltage. However, when the battery voltage from the battery during the absence of input supply. decreases 100mV below the VREG, it will be recharged to keep the battery voltage. Charge Status Fast-Charge Current Setting Outputs. The open-drain CHG_S and PGOOD outputs The LP28007 offers ISETA pin to determine the ACIN indicate various charger operations as shown in the charge rate from 100mA to 1200mA. The charge following table. These status pins can be used to drive current can be calculated as following equation. LEDs or communicate to the host processor. Note that ON indicates the open-drain transistor is turned on and LED is bright. Pre- Charge Current Setting During a charge cycle if the battery voltage is below the VPRECH threshold, the LP28007 applies a Temperature Regulation and Thermal Protection pre-charge mode to the battery. This feature revives In order to maximize the charge rate, the LP28007 deeply discharged cell sand protects battery life. The features a junction temperature regulation loop. If the LP28007 internal determines the pre-charge rate as power dissipation of the IC results in a junction 10% of the fast-charge current. temperature greater than the thermal regulation LP28007 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 9 of 11 Preliminary Datasheet LP28007 threshold (125°C), theLP28007 throttles back on the Layout Consideration charge current in order to maintain a junction The LP28007 is a fully integrated low cost single-cell temperature around the thermal regulation threshold Li-Ion battery charger ideal for portable applications. (125°C). Careful The LP28007 monitors the junction PCB layout is necessary. For best temperature, TJ, of the die and disconnects the battery performance, place all peripheral components as close from the input if TJ exceeds 125°C. This operation to the IC as possible. A short connection is highly continues until junction temperature falls below recommended. The following guide lines should be thermal regulation threshold (125°C) by the hysteresis strictly followed when designing a PCB layout for the level. This feature prevents the chip from damage. LP28007.Input capacitor should be placed close to IC and connected to ground plane. Selecting the Input and Output Capacitors The trace of input in the PCB should be placed far In most applications, the most important is the away the sensitive devices or shielded by the ground. high-frequency decoupling capacitor on the input of The GND should be connected to a strong ground the LP28007.A 1uF ceramic capacitor, placed in close plane for heat sinking and noise protection. The proximity to input pin and GND pin is recommended. In connection of RSETA should be isolated from other some applications depending on the power supply noisy traces. characteristics and cable length, it may be necessary The short wire is recommended to prevent EMI and to add an additional 10uFceramic capacitor to the noise coupling. input. Output capacitor should be placed close to IC and The LP28007 requires a small output capacitor for connected to ground plane to reduce noise coupling. loop stability. A 1uF ceramic capacitor placed between When PCB has poor layout, the 10uF is recommended the BATT pin and GND is typically sufficient. to prevent noise. LP28007 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 10 of 11 Preliminary Datasheet LP28007 Packaging Information LP28007 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 11 of 11