MP V, 1A Dual Input Linear Battery Charger With Timer

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1 MP268 28V, 1A Dual Input Linear Battery Charger With Timer The Future of Analog IC Technology DESCRIPTION The MP268 is a dualinput, linear, highperformance lowcost single cell LiIon or LiPolymer battery charger. It accepts two power inputs, one from a USB (Universal BUS) port and the other from an AC adapter. By integrating high voltage input protection into the charger IC, the MP268 can tolerate an input surge up to 28V. Due to the protection inputs function, lowcost, large output tolerance adapters can be used safely. The device features constant current (CC) and constant voltage (CV) charging modes with programmable charge currents (1mA to 1.A), current blocking and trickle charge. The charge current for adapter input can be programmed by an external resistor, while the charge current for USB input is preset at 45mA.The device also provides charge status and fault indications to the system. For guaranteed safe operation, the MP268 folds back charge current when the device is heated up due to limited PCB space. Other safety features are including battery temperature monitoring, and programmable timer to complete the charging cycle. MP268 is available in a 1pin 3mm x 3mm QFN package. FEATURES Complete Solution for Charging SingleCell LionIon Battery Input Surge Up to 28V Adapter and USB Input Programmable Charge Current: 1mA to 1.A Preset USB Charge Current: 45mA Proprietary Constant Voltage Auto Recharge Proprietary OverVoltage Protection.75% Accuracy over Temperature <1µA Battery Reverse Current 125µA Standby Current from V IN Battery Temperature Monitoring Thermal Protection Fault and Charge Status Indicators Internal SoftStart Tiny 3mm x 3mm QFN Package APPLICATIONS Cell Phones Digital Cameras Smart Phones PDAs MP3 Players MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION To AC Adapter IN BATT To System To USB USB SHDN MP268 R2 D2 R3 C4 C1 C2 ICHG IBF FAULT STATUS D1 TMR GND R1 R4 C3 MP268 Rev

2 PACKAGE REFERENCE TOP VIEW IN USB FAULT STATUS SHDN BATT ICHG GND TMR IBF ABSOLUTE MAXIMUM RATINGS (1) IN, USB to GND....3V to +28V All Other Pins to GND....3V to +6.5V Junction Temperature...14 C Lead Temperature...26 C Storage Temperature C to +15 C Recommended Operating Conditions (2) Nominal Supply Voltage V IN V to 5.5V Operating Temperature... 4 C to +85 C EXPOSED PAD ON BACKSIDE Thermal Resistance (3) θ JA θ JC 3x3 QFN C/W Part Number* Package Temperature MP268DQ QFN1 (3mm x 3mm) * For Tape & Reel, add suffix Z (eg. MP268DQ Z) For RoHS compliant packaging, add suffix LF (eg. MP268DQ LF Z) 4 C to +85 C Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1 square of 1 oz copper. ELECTRICAL CHARACTERISTICS V IN = 5V, V EN = V, T A = +25 C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units IN, USB Input Voltage V IN, V USB V IN, USB Input Undervoltage Threshold IN, USB Input Over Voltage Threshold Supply Current Charger Battery Voltage Regulation Battery OverVoltage Protection Constant Current Regulation V INUV IN Input Rising V V INOV IN Input Rising V I SUPPLY SHDN= Low and BATT floating 1 SHDN = High and BATT floating 8 T = +25 C, = T = C to +5 C, = T = 5 C to +75 C, = _OVP = 4.25V µa I CHG,IN V IN = 5V, = 3.8V R CHG = 2.3kΩ µa ma I CHG,USB V IN =V, V USB = 5V, =3.8V ma V Constant Current Variation V IN = 5V, = 3.8V, T J = C to +12 C, R CHG = 1.6kΩ to 8.kΩ %I CHG (4) MP268 Rev

3 ELECTRICAL CHARACTERISTICS (continued) V IN = 5V, V EN = V, T A = +25 C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Pass Device Dropout Voltage V DROP,IN V IN, =4V, R CHG = 1.5kΩ, 1A load on the BATT pin V DROP,USB V USB = 4V, 4mA load on the BATT pin 13 mv 152 mv Trickle Current V IN = 5V, = 2.3V %I CHG (4) IBF Accuracy 2 +2 %IBF Trickle Threshold Voltage V Trickle Voltage Hysteresis 1 mv SHDN Trip High Threshold 2. V SHDN Trip Low Threshold.4 V SHDN Pulldown Resistor 5 kω FAULT, STATUS Sink Current Battery Reverse Current to BATT Pin Thermal Shutdown Threshold Thermal Shutdown Hysteresis Recharge Threshold Recharge Voltage Threshold Oscillator Pin Voltage =.4V 4 ma SHDN = High and Input = Floating or V 1 µa C 1 C V RECHG 4. V Oscillator Period T OSC C TIME = 15nF ms TIMEOUT Period T TIMEOUT 2 15 T OSC Notes: 4) I CHG is the target preprogrammed charge current (Die temperature below 11 C). MP268 Rev

4 PIN FUNCTIONS Pin # Name Description 1 IN Input Supply. IN receives the AC adapter supply voltage. 2 USB Input Supply. USB receives the USB supply voltage. 3 FAULT OpenDrain Fault Status Indicator. This pin is low under any fault conditions. 4 STATUS OpenDrain Charge Indicator. This pin is low during charging. 5 SHDN Charger IC Shutdown. Pull SHDN high to disable the IC or leave it floating to enable the IC. 6 IBF Programmable Input for end of charger current. 7 TMR Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set the oscillator period. A 1uF capacitor on the TMR pin will make the oscillator period 4ms. 8 GND Ground. Exposed pad and GND must connect to same ground plane. 9 ICHG Constant Charge Current Program for the IN input. Connect this pin to an external resistor to program the charging current in CC Mode when the current from the IN pin charges the battery. 1 BATT Charger Output. MP268 Rev

5 TYPICAL PERFORMANCE CHARACTERISTICS V IN =5V, C IN =2.2uF, C OUT =1uF, R CHG =2.21kΩ, T A =25 C, unless otherwise noted. CHARGE CURRENT(A) Battery Charge Curve CHARGE TIME (MINUTES) CHARGE TIME (MINUTES) CHARGE CURRENT(A) Battery Charge Curve CHARGE CURRENT (A) Charge Current vs. Battery Voltage Battery Voltage vs. Input Voltage Adapater In USB In CHARGE CURRENT(mA) Charge Current vs. Battery Voltage CHARGE CURRENT(mA) Charge Current vs. Input Voltage Adapater In USB In INPUT VOLTAGE (V) BATTERY VOLTAGE (V) INPUT VOLTAGE (V) R SET RESISTANCE Charge Current vs. R SET Resistance CHARGE CURRENT (ma) Reverse Current vs. Battery Voltage MP268 Rev

6 TYPICAL PERFORMANCE CHARACTERISTICS (continued) V IN =5V, C IN =2.2uF, C OUT =1uF, R CHG =2.21kΩ, T A =25 C, unless otherwise noted. Power On (Adapter In) Power On (USB In) Power Off (Adapter In) V IN 5mA/div V IN 5mA/div V IN 5mA/div 4ms/div 4ms/div 2ms/div Power Off (USB In) Startup with SD (Adapter In) Startup with SD (USB In) V IN 5mA/div V SD 5mA/div V SD 5mA/div 4ms/div Shutdown with SD (Adapter In) Shutdown with SD (USB In) V SD V SD 5mA/div 5mA/div 1ms/div 1ms/div MP268 Rev

7 TYPICAL PERFORMANCE CHARACTERISTICS (continued) V IN =5V, C IN =2.2uF, C OUT =1uF, R CHG =2.21kΩ, T A =25 C, unless otherwise noted. MP268 Rev

8 BLOCK DIAGRAM IN + OV IN V OVP BATT V UVLO + UVIN IFB1 USB IFB1 IFB2 + mux ICHG Charging Current Control VFB 1.23V + IFB2 VFB Die Temp TRICKLE + 2.5V RECHG + 4.1V OV IN UV IN FAULT SHDN VTH SD + Control Logic STATUS TMR OSC TIMER GND THERMAL SHUTDOWN Figure 1 Functional Block Diagram MP268 Rev

9 OPERATION Input Auto Selection and Voltage Range The MP268 is a dualinput charger, when both input sources are present, MP268 selects only one power source to charge the battery. When the adapter input voltage is higher than the UVLO threshold, IN is selected as the power source. Otherwise the USB input is selected. If both the inputs is above UVLO but the adaptor input voltage is below the battery voltage, while the USB voltage is higher than the battery voltage, then the USB input is used to charge the battery. In case there is no power source available or both the two input are below the UVLO, the MP268 is in the sleep mode, in which the current into the BATT pin is reduced to TBD µa. The IC is also disabled to prevent the battery from draining. The MP268 has builtin input voltage surge protection as high as +28V. The charger IC will be automatically disabled when the input voltage is lower than 2.5V or higher than 6.V. Charge Cycle (Mode Change: Trickle > CC> CV) Figure 2 below shows the typical charging profile for the MP268. For a fully depleted battery with a terminal voltage lower than 2.6V, the MP268 will start with the trickle charge (preconditioning) at 1% of the programmed full charge current. After the battery voltage reaches 2.6V, the charger begins charging at the constant current of the programmed value (I CHG ) and the charge timer starts counting down. This is referred to as Constant Current (CC) mode. Once the battery voltage reaches 4.2V, the charger will operate in the constant voltage (CV) mode until the battery is fully charged. The charge current drops during CV mode, and the battery full indication is set when the charge timer is time off. The charge timer is to protect the system from charging a dead battery for excessive long time. V IN V CH V MIN I SET 1% of I SET Charge Trickle Start Charging CC Mode POWER DISSIPATION Timer CV Mode Charge End Figure 2 MP268 Typical Charging Profile Charge Termination and AutoRecharge At any time when is 5mV higher than the trimmed charge target, the MP268 reduces its charge current to µa. This ensures the safety of the battery. Also, the CV control loop always monitors the battery voltage such that it will automatically recharge the battery when it is depleted below the target level. Upon drops to 4.V, the charger will automatically restart the charge cycle until the end of the timeout. When the input adapter is unplugged, there is only 1µA leakage current from battery drawn by the MP268. Programming of Charge Current and Battery Full Current The Charge Current (I CHG ) of Adaptor input can be programmed from.1a to 1A by a resistor (R CHG ) connecting from the ICHG pin to GND. The relationship of the charge current and the programming resistance is established by the following table and graph. The recommended resistance for programming the charge current is TBD.The battery full charge current threshold (I BF )is programmed by connecting a resistor R BF from the I BF pin to GND: I BF =1AX1.7kΩ/R BF When the USB is selected as the power source, the charge current is fixed at a preset value 45mA, which is a typical value of USB current. MP268 Rev

10 Table 1 R CHG and I CHG Relationship R CHG (kω) TBD I CHG (ma) TBD Figure 3 Charge Current vs. 1/RPGM Resistance Charge Status and Fault Indication The open drain pin STATUS is used to indicate charging status. While battery is being charged, the STATUS pin is pulled low, when the battery full condition is reached or any other condition prevents the charger from charging, the STATUS pin will become a floating. STATUS is then latched till a new charge cycle is started. Upon a timeout fault event happen, the FAULT pin is pulled low. When the is lower than 2.6V for 1/8 th of timeout period or the charging can not reach EOC status before the timeout happens, this fault status is latched, the charging is suspended, and the FAULT pin is pulled low. To clear this fault, either the V IN or V USB should be recycled. One timeout period is equivalent to 2 15 oscillator clock cycles. With a 1µF capacitor on the TMR pin, it takes 3.64 hours. V IN POR Threshold The Power On and recharge cycle are illustrated in Figure 4. STATUS FAULT 15 Cycles to 1/8 TIMEOUT V RECHARGE 2.6V V MIN 15 Cycles I CHARGE I MIN t t 1t 2 t 3 t 4 t 5 t 6t 7 Figure 4 MP268 Typical ReCharging Waveforms MP268 Rev

11 STATE DIAGRAM. POR or STOP VIN or low Timeout Fault Temp fault VIN POR and Battery Inserted and VBAT VIN and EN high VBATT V TRK for 1/8th TIMEOUT Temp Fault STATUS Temp Fault Removed Trickle Charge FAULT VBATT V TRK before 1/8th TIMEOUT Fast Charge FAULT Temp Fault VBATT V RECH (VBATT V IBATT IMIN) TEMP fault removed Termination End of Charge TIMEOUT Temp Fault TEMP fault TEMP fault Figure 5 MP268 State Diagram MP268 Rev

12 PACKAGE INFORMATION QFN1 (3mm x 3mm) PIN 1 ID MARKING PIN 1 ID SEE DETAIL A PIN 1 ID INDEX AREA BSC TOP VIEW BOTTOM VIEW.2 REF.8 1. PIN 1 ID OPTION A R.2 TYP. PIN 1 ID OPTION B R.2 TYP...5 SIDE VIEW DETAIL A 2.9 NOTE: ) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE.1 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO229, VARIATION VEED5. 5) DRAWING IS NOT TO SCALE RECOMMENDED LAND PATTERN NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP268 Rev

13 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Monolithic Power Systems (MPS): MP268DQLFZ MP268DQLFP

MP5007 5V, 1A- 5A Programmable Current Limit Switch

MP5007 5V, 1A- 5A Programmable Current Limit Switch The Future of Analog IC Technology DESCRIPTION The MP5007 is a protection device designed to protect circuitry on the output (source) from transients on input (V CC ). It also protects V CC from undesired