Preliminary Datasheet LP28009 Single and Dual Cell Li+ Battery Charger IC –LP28009 General Description Features The LP28009 is a fully integrated low cost single-cell and dual cell Li-Ion battery charger IC ideal for portable applications. The LP28009 is capable of being powered up from AC adapter. The LP28009 enters sleep mode when AC adapter is removed. The LP28009 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 1.2A with an external resister. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The LP28009 features 18V maximum rating voltages for AC adapter. The other features are under voltage protection, over voltage protection for AC adapter supply and battery temperature monitoring. 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 Battery Temperature Monitoring Small 8-Lead SOP(EP) Package Thermal Feedback Optimizing Charge Rate ROHS Compliant and 100% Lead (Pb)-Free Marking Information Device Marking LP28009 Package Shipping SP:SOP-8 3K/REEL Order Information LP28009 □ □ □ □ □ F: Pb-Free Package Type Typical Application Circuit VIN 1 SP: SOP-8(EP) RED Output Voltage 2 3 4 42: 4.2V 10uF 9 84: 8.4V ACIN CHRG_S BATT NC 8 7 10uF PGOOD GND GND ISETA EN 5 BATTERY 6 LP28009-42SPF I/O CTRL Q1 LPM9013 Applications Portable Media Players/MP3 players Cellular and Smart mobile phone PDA/DSC Bluetooth Applications VIN 1 RED 2 3 4 10uF 9 ACIN CHRG_S BATT NC 8 7 10uF PGOOD GND ISETA GND EN BATT 5 6 LP28009-84SPF I/O CTRL Q8 LPM9013 LP28009 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 1 of 12 Preliminary Datasheet LP28009 Functional Pin Description P ac k age T y pe P in C onf ig ur ati ons ACIN 1 8 BATT CHG_S 2 ESOP- 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 tion 1 AC I N 2 C H G_ S C har ge Status Indic ator O utput(O pen Dr ain) . 3 PG O OD Pow er G ood Indic ator O utput( O pen dr ain) . 4 GND 5 I SET A 6 EN C har ge E nable Input( ac tiv e low ) . 7 NC N o I nter nal C onnec tion. Wall Ad aptor C har ge Input Supply . G r ound. Wall Adaptor s upply c har ge c urr ent Set point. Bat t er y C har ge C ur r ent O utput. T his pin pr ov ides c har ge c ur r ent to the battery and 8 BAT T r egulates the final float v oltage to 4.2 or 8.4V. An int er nal pr ec is ion r es istor div ider fr om this pin s ets the f loat v oltage w hic h is disc onnec ted i n s hutdow n mode. 9 ( Ex pos ed Ex pos ed Pad Should be s older ed to PC B Boar d and PG N D C onnec ted to G N D . Pad) Note: LP28009-42SPF and LP28009-84SPF of LP28009 – 02 May.-2013 Battery (Pin8) is output pin, the pin connector to Battery. Email: [email protected] www.lowpowersemi.com Page 2 of 12 Preliminary Datasheet LP28009 Function Block Diagram LP28009 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 3 of 12 Preliminary Datasheet LP28009 LP28009-42 Flow Chart LP28009 LP28009 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 4 of 12 Preliminary Datasheet LP28009 Absolute Maximum Ratings VIN, VBATT, VCHGSB, VPGOOD, VEN --------------------------------------------------------------------- -0.3V to 15V Storage Temperature Range------------------------------------------------------------------------------------ -65℃ to 150℃ VISETA --------------------------------------------------------------------------------------------------------------- -0.3V to 3.6V Junction Temperat ure (TJ) ---- ---------------- ----------------- ------------ ------------------------ ---- 150℃ Lead Temperature (soldering,10 sec.) -------------------------------------------------------------------------------------- 260℃ Operating Ratings Supply Voltage --------------------------------------------------------------------------------------------------------------- 9V to 13.5V Thermal Resistance(θJA) ------------------------------------------------------------------------------------------------------- 46℃/W Operating Temperature Range -------------------------------------------------------------------------------------- -40℃ to 85℃ Electrical Characteristics (TA=25℃, VIN=10V; unless otherwise specified.) Symbol VIN Icc Parameter Input Operating Conditions Voltage Range Input Supply Current Min Typ Max Units 9 10 13.5 V Charge Mode.RSET=30K 300 uA Standby Mode (Charge Terminated) 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 ITRICKLE VTRICKLE VTRHYS VMSD VASD LP28009 – 02 BATT Pin Current Trickle Charge Current Trickle Charge Threshold 8.484 V 500 mA 1000 mA Standby Mode, VBATT=8.4V -1 0 1 uA Shutdown Mode -1 0 1 uA Sleep Mode, VIN=0V -1 0 1 uA VBATT <VTRICKLE, RSET=1.5K 60 mA VBATT <VTRICKLE, RSET=0.75K 120 mA 5.8 V 250 mV RSET=1.5K, VBATT Rising Voltage Trickle Charge Hysteresls 8.4 RSET=1.5K Voltage ISETA Pin Rising 2.15 V Threshold Voltage ISETA Pin Falling 2.05 V VIN – VBATT Lockout Vin from High to Low 30 mV Manual May.-2013 Shutdown Email: [email protected] www.lowpowersemi.com Page 5 of 12 Preliminary Datasheet Threshold Voltage Vin from Low to High 60 mV 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 25 uA 0.35 V 0.35 V C/10Termination ITERM VSET ICHG_SB VCHG_SB VPGOOD LP28009 CHG_SB Current Pin Weak VCHG_SB=5.0V Pull-Down 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 -- % 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 ______________ C H G _ S Pull Down Voltage VCHG_S TBD, ICHG_S=5mA PGOOD Pull Down Voltage VPGOOD TBD, IPGOOD=5mA _________________ Logic-High Voltage ______ E N Threshold Logic-Low Voltage ______ E N Pin Input Current -- 65 -- mV -- 220 -- mV VIH 1.5 -- -- V VIL -- -- 0.4 V IEN IEN=2V -- -- 2 μA Protection Thermal Regulation Internal Default OVP SET LP28009 – 02 May.-2013 Email: [email protected] -- 125 -- ℃ -- 6.5 -- V www.lowpowersemi.com Page 6 of 12 Preliminary Datasheet Parameter Symbol Test Conditions LP28009 Min Typ Max Units 4.4 4.5 V 80 120 mV Supply Input ACIN UVP Rising Threshold Voltage VUV_HIGH ACIN UVP Hysteresis VUV_LOW ACIN Standby Current ISTBY VBATT=4.5V 300 500 μA ACIN Shutdown Current ISHDN VEN=HIGH 50 100 μA 150 250 μA 2 5 4.2 4.242 50 VACIN=4V, ACIN UVP Current IUVP VUSB=4V, VBATT=3V VACIN=4V, BATT Sleep Leakage Current ISLEEP VUSB=4V, μA VBATT=4.5V Voltage Regulation BATT Regulation Voltage VREG IBATT=60mA -1 Regulation Voltage Accuracy ACIN MOSFET 4.158 RDS(ON)_ACIN +1 IBATT=500mA 600 V % mΩ Current Regulation ISETA Set Voltage (Fast Charge Phase) VISETA Full Charge Setting Range ICHG_AC ACIN Charge Current Accuracy ICHG_AC LP28009 – 02 May.-2013 VBATT=3.5V 2.45 100 VBATT=3.8V RISET=1.5KΩ Email: [email protected] -- 2.5 -125 www.lowpowersemi.com 2.55 V 1200 mA -- ℃ Page 7 of 12 Preliminary Datasheet LP28009 Typical Operating Characteristics LP28009 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 8 of 12 Preliminary Datasheet LP28009 – 02 May.-2013 Email: [email protected] LP28009 www.lowpowersemi.com Page 9 of 12 Preliminary Datasheet LP28009 Application Information Automatically Power Source Selection The LP28009 is a battery charger IC which is designed for Li-ion Battery with 4.2V rated voltage. ACIN Mode : When the ACIN input voltage is higher than the UVP voltage level (4.4V), the LP28009 will turn on ACINP-MOSFET. Sleep Mode : The LP28009 will enter Sleep Mode when ACIN input voltage are removed. This feature provides low leakage current from the battery during the absence of input supply. ACIN Over Voltage Protection The ACIN input voltage is monitored by an internal Pre- Charge Current Setting OVP comparator. The comparator has an accurate During a charge cycle if the battery voltage is below reference of 2.5V from the band-gap reference. The the VPRECH threshold, the LP28009 applies a OVP threshold is set by the internal resistive. The pre-charge mode to the battery. This feature revives protection threshold is set to 6.5V. When the input deeply discharged cell sand protects battery life. The voltage exceeds the threshold, the comparator outputs LP28009 internal determines the pre-charge rate as a logic signal to turn off the power P-MOSFET to 10% of the fast-charge current. prevent the high input voltage from damaging the electronics in the handheld system. When the input Battery Voltage Regulation over voltage condition is removed (ACIN < 6V), the The LP28009 monitors the battery voltage through the comparator re-enables the output by running through BATT pin. Once the battery voltage level closes to the the soft-start. VREG threshold, the LP28009 voltage enters constant phase and the charging current begins to taper down. Fast-Charge Current Setting When battery voltage is over the VREG threshold, the The LP28009 offers ISETA pin to determine the ACIN LP28009 will stop charge and keep to monitor the charge rate from 100mA to 1.2A. The charge current battery voltage. However, when the battery voltage can be calculated as following equation. decreases 100mV below the VREG, it will be recharged to keep the battery voltage. Charge Status Outputs. The open-drain CHG_S and PGOOD outputs indicate various charger operations as shown in the following table. 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. LP28009 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 10 of 12 Preliminary Datasheet LP28009 the BATT pin and GND is typically sufficient. Layout Consideration The LP28009 is a fully integrated low cost single-cell Temperature Regulation and Thermal Protection Li-Ion battery charger ideal for portable applications. In order to maximize the charge rate, the LP28009 Careful features a junction temperature regulation loop. If the performance, place all peripheral components as close power dissipation of the IC results in a junction to the IC as possible. A short connection is highly temperature greater than the thermal regulation recommended. The following guide lines should be threshold (125°C), theLP28009 throttles back on the strictly followed when designing a PCB layout for the charge current in order to maintain a junction LP28009.Input capacitor should be placed close to IC temperature around the thermal regulation threshold and connected to ground plane. (125°C). The LP28009 monitors the PCB layout is necessary. For best junction temperature, TJ, of the die and disconnects the battery The trace of input in the PCB should be placed far from the input if TJ exceeds 125°C. This operation away the sensitive devices or shielded by the ground. continues until junction temperature falls below The GND should be connected to a strong ground thermal regulation threshold (125°C) by the hysteresis plane for heat sinking and noise protection. The level. This feature prevents the chip from damage. connection of RSETA should be isolated from other noisy traces. Selecting the Input and Output Capacitors The short wire is recommended to prevent EMI and In most applications, the most important is the noise coupling. high-frequency decoupling capacitor on the input of Output capacitor should be placed close to IC and the LP28009.A 1uF ceramic capacitor, placed in close connected to ground plane to reduce noise coupling. proximity to input pin and GND pin is recommended. In When PCB has poor layout, the 10uF is recommended some applications depending on the power supply to prevent noise. characteristics and cable length, it may be necessary to add an additional 10uFceramic capacitor to the input. The LP28009 requires a small output capacitor for loop stability. A 1uF ceramic capacitor placed between LP28009 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 11 of 12 Preliminary Datasheet LP28009 Packaging Information LP28009 – 02 May.-2013 Email: [email protected] www.lowpowersemi.com Page 12 of 12