Preliminary Datasheet LP78092 1A Charge And Dual Channel Ultra-Fast CMOS LDO Regulator General Description Features The LP78092 is a PMIC，which has 1ch Charger and 2ch LDO with TQFN16 package. Charger: Programmable Charge Current Up to 1000mA No MOSFET, Sense Resistor 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 8µA Leakage Current in Shutdown Drainage Charge Current Thermal Regulation Status Outputs for LED or System Interface LDO: Wide Operating Voltage Ranges : 2.5V to 6.0V Low-Noise for RF Applications High PSRR: -68dB at 1kHz No Noise Bypass Capacitor Required Dual LDO Outputs (280mV/400mA) Ultra-low Quiescent Current 75uA Built-in Short-Circuit Protection Its charger is a complete constant-current constant voltage linear charger for single cell lithium-ion batteries. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be ISET rammed externally with a single resistor. The charger automatically terminates the charge cycle when the charge current drops to 1/10th the ISET rammed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LP78092 automatically enters a low current state, dropping the battery drain current to less than 8µA. Other features include charge current monitor, under voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. The LP78092 contains a dual channel, low noise, and low dropout regulator sourcing up to 600mA at each channel. The range of output voltage is from 0.81V to Vin by operating from 2.5V to 6.5V input. LP78092 offers 2% accuracy, extremely low dropout voltage (280mV @ 400mA), and extremely low ground current, only 75μA per LDO. The shutdown current is near zero current which is suitable for battery-power devices. Other features include current limiting, over temperature, output short circuit protection. Consumption Available in TQFN-16 Package RoHS Compliant and 100% Lead (Pb)-Free Marking Information Device LP78092QVF Order Information LP78092 □ □ Package Type QV:TQFN-16 Version 1.0 Package Shipping QV:TQFN16 3K/REEL □ F: Pb-Free LP78092 – 00 Marking Feb.-2014 Applications MID/Pad Power Bank Smart Phone Bluetooth Applications Email: [email protected] www.lowpowersemi.com Page 1 of 10 Preliminary Datasheet LP78092 Functional Pin Description Pack ag e Typ e Pin C o n f ig u rat io n s CE CHRG STDBY BAT 15 13 16 14 SET 1 12 BVIN FB1 2 11 BVIN EN1 3 10 FB2 GND 4 9 EN2 GND TQFN-16 5 6 8 7 LVIN1 LOUT1 LVIN2 LOUT2 TOP VIEW Pin Description PIN No. PIN DESCRIPTION Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is pro- 1 SET grammed by connecting a 1% resistor(RPROG)to ground. When charging in constant-current mode, this pin servos to 2V. In all modes, the voltage on this pin can be used to measure the charge current using the following formula.LP78092: Iset=1000/RPROG. 2 FB1 Feedback pin for channel 1 LDO. The reference voltage is 0.8V. 3 EN1 Enable pin for channel 1 LDO. Active high. 4 GND Ground pin. 5 LVIN1 Power supply for channel 1 LDO. 6 LOUT1 Output pin of Channel 1 LDO. 7 LVIN2 Power supply for channel 2 LDO. 8 LOUT2 Output pin of Channel 2 LDO. 9 EN2 Enable pin for channel 2 LDO. Active high. 10 FB2 Feedback pin for channel 2 LDO. The reference voltage is 0.8V. 11,12 BVIN BVIN is the input power source for charger. Connect to a wall adapter. 13 BAT 14 STDBY 15 CHRG 16 CE LP78092 – 00 BAT is the connection to the battery. Typically a 10µF Tantalum capacitor is needed for stability when there is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is required. Open-Drain Complete Status Output. When the battery is charging, the STAT pin is pulled high by an internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled Low. Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled High. Enable charger pin. Active high. Version 1.0 Feb.-2014 Email: [email protected] www.lowpowersemi.com Page 2 of 10 Preliminary Datasheet LP78092 Application Circuit LP78092 VIN BVIN CIN Cbat LVIN1 LVIN2 R0 RED BAT BAT CHRGB STDBY B GREEN ON CE EN1 EN2 OFF OUT2 OUT1 OUT1 Cout1 R1 FB1 OUT2 R2 SET Cout2 R3 Rset FB2 R4 LP78092 – 00 Version 1.0 Feb.-2014 GND Email: [email protected] www.lowpowersemi.com Page 3 of 10 Preliminary Datasheet LP78092 Function Block Diagram SHUTDOWN AND LOGIC CONTROL EN1 3 VREF MOS DRIVER + - FB1 2 5 LVIN1 6 LOUT1 ERROR AMPLIFIER CURRENT-LIMIT AND THERMAL PROTECTION SHUTDOWN AND LOGIC CONTROL EN2 9 7 LVIN2 MOS DRIVER + - FB2 10 8 LOUT2 ERROR AMPLIFIER 11, BVIN 12 145℃ TDIE VCC TA 1X 1200X - 13 BAT 5μA + MA R1 CE 16 SCHMITT VA CA - + STDBY 14 SHDN C1 - + - R2 REF 1.22V + R3 1V R4 C2 CHRG 15 C3 + 0.1V - R5 + - TO BAT 3μA VCC 2.9V 21 SET LP78092 – 00 Version 1.0 Feb.-2014 Email: [email protected] 4 GND www.lowpowersemi.com Page 4 of 10 Preliminary Datasheet LP78092 Absolute Maximum Ratings Input Voltage to GND (LVIN1/2，BVIN) ------------------------------------------------------------------------ -0.3V to 6.5V VOUT1/2 ------------------------------------------------------------------------------------------------------------------ -0.3V to 6V BAT, SET, STAT, EN, CE ----------------------------------------------------------------------------------- -0.3V to VIN+0.3V BAT Short-Circuit Duration -------------------------------------------------------------------------------------------- Continuous BAT Pin Current ------------------------------------------------------------------------------------------------------------ 1200mA Maximum Junction Temperature -------------------------------------------------------------------------------------------- 125°C Operating Junction Temperature Range (TJ) ------------------------------------------------------------------ -40℃ to 85°C Maximum Soldering Temperature (at leads, 10 sec) ------------------------------------------------------------------- 260°C Thermal Information Maximum Power Dissipation (PD,TA<40°C) ------------------------------------------------------------------------------ 1.5W Thermal Resistance (JA) ---------------------------------------------------------------------------------------------------- 68℃/W LP78092 – 00 Version 1.0 Feb.-2014 Email: [email protected] www.lowpowersemi.com Page 5 of 10 Preliminary Datasheet LP78092 Electrical Characteristics (The specifications which apply over the full operating temperature range, otherwise specifications are at T A=25°C. LVIN1/2=BVIN= 5V, unless otherwise noted.) SYMBOL PARAMETER CONDITIONS MIN TYP. MAX UNITS 3.9 5 6.5 V Charge Mode, RSET = 10k 300 2000 Standby Mode (Charge Terminated) 200 500 25 50 4.158 4.2 4.242 RSET = 1k, Current Mode 900 1000 1100 RSET = 2k, Current Mode 450 500 550 Charge VIN ICC Adapter/USB Voltage Range Input Supply Current Shutdown Mode (RSET Not Connected, VCC < VBAT, or VCC < VUV) VFLOAT IBAT Regulated Output (Float) Voltage BAT Pin Current 0°C ≤ TA ≤ 85°C, IBAT = 40mA Standby Mode, VBAT = 4.2V -2.5 -6 ±1 ±2 Sleep Mode, VCC = 0V ±1 ±2 50 Shutdown Mode (RSET Not Connected) ITRIKL Trickle Charge Current VBAT < VTRIKL, RSET = 2k VTRIKL Trickle Charge Threshold Voltage RSET = 10k, VBAT Rising VTRHYS 0 2.8 2.9 uA V mA uA mA 3.0 V Trickle Charge Hysteresis Voltage RSET = 10k 120 mV VUV VCC Under voltage Lockout Threshold From VCC Low to High 3.9 V VUVHYS VCC Under voltage Lockout Hysteresis VASD VCC – VBAT Lockout Threshold Voltage VCC from Low to High 200 300 mV 70 100 140 mV 5 30 50 mV RSET = 10k 0.085 0.10 0.115 mA/mA RSET = 2k 0.085 0.10 0.115 mA/mA VCC from High to Low ITERM C/10 Termination Current Threshold VSET SET Pin Voltage RSET = 10k, Current Mode VSTAT STAT Pin Output Low Voltage ISTAT = 5mA Recharge Battery Threshold Voltage VFLOAT - VRESTAT ΔVRESTAT 150 2 0.35 100 150 V 0.6 V 200 mV TLIM Junction Temperature in Constant Temperature Mode 145 °C RON Power FET “ON” Resistance (Between VCC and BAT) 300 mΩ VCEL Logic-Low Voltage 0.4 VCEH Logic-High Voltage 1.4 VIN1 Supply voltage 2.5 ILOAD Output Loading Current VEN=VIN,VIN>2.5V Current Limit RLOAD = 1Ω V LDO ILIM VFB VFB IQ 6.5 600 mA 750 mA Adjustable voltage reference IOUT=1mA 0.8 0.816 V Quiescent Current VEN ≥ 1.4V, IOUT = 0mA 75 130 μA IOUT = 200mA, VOUT >2.8V 140 160 IOUT = 400mA, VOUT >2.8V 280 320 VDROP Dropout Voltage 0.784 V mV ΔVLINE Line Regulation VIN = (VOUT + 1V) to 5.5V, IOUT = 1mA 0.3 % ΔVLOAD Load Regulation 1mA < IOUT < 400mA 0.6 % ISTBY Standby Current VEN = GND, Shutdown 1 μA EN Input Bias Current VEN = 1V or 5V 5.3 uA IEN VENL Logic-Low Voltage VENH Logic-High Voltage 0.01 0.8 0.4 1.4 V VN Output Noise Voltage 10Hz to 100kHz, 100 uVRMS TSD Thermal Shutdown Temperature IOUT = 200mA, COUT = 1µF 150 °C LP78092 – 00 Version 1.0 Feb.-2014 Email: [email protected] www.lowpowersemi.com Page 6 of 10 Preliminary Datasheet LP78092 Charge Characteristics LP78092 – 00 Version 1.0 Feb.-2014 Email: [email protected] www.lowpowersemi.com Page 7 of 10 Preliminary Datasheet LP78092 Application Information The LP78092 is a single cell lithium-ion battery charger using a When the BAT pin voltage rises above 2.9V, the charger enters constant-current/constant-voltage algorithm. It can deliver up to constant-current mode, where the SET rammed charge current 1000mA of charge current (using a good thermal PCB layout) is supplied to the battery. When the BAT pin approaches the with a final float voltage accuracy of ±1%. The LP78092 final float voltage (4.2V), the LP78092 enters constant-voltage includes an internal P-channel power MOSFET and thermal mode and the charge current begins to decrease. When the regulation circuitry. No blocking diode or external current sense charge current drops to 1/10 of the SET rammed value, the resistor is required; thus, the basic charger circuit requires only charge cycle ends. two external components. Furthermore, the LP78092 is capable of operating from a USB power source. For LDO part, like any RSET ramming Charge Current low-dropout regulator, the external capacitors used with the The charge current is SET rammed using a single resistor from LP78092 must be carefully selected for regulator stability and the SET pin to ground. The battery charge current is 500 times performance. Using a capacitor whose value is > 2µF on the the current out of the SET pin. The SET ram resistor and the LP78092 input and the amount of capacitance can be increased charge current are calculated using the following equations: without limit. The input capacitor must be located a distance of LP78092: not more than 0.5 inch from the input pin of the IC and returned RSET=1000V/ICHG，ICHG= 1000V/RSET to a clean analog ground. There is a special attention which is the input capacitance should not be less than output The charge current out of the BAT pin can be determined at any capacitance. Any good quality ceramic or tantalum can be used time by monitoring the SET pin voltage using the following for this capacitor. The capacitor with larger value and lower equation: ESR (equivalent series resistance) provides better PSRR and IBAT= VSET x 500/RSET line-transient response. The output capacitor must meet both Note: Vset is 2Volts. requirements for minimum amount of capacitance and ESR in all LDOs application. The LP78092 is designed specifically to Charge Termination work with low ESR ceramic output capacitor in space-saving A charge cycle is terminated when the charge current falls to and performance consideration. Using a ceramic capacitor 1/10th the SET rammed value after the final float voltage is whose value is at least 1µF with ESR is > 25mΩ on the reached. This condition is detected by using an internal, filtered LP78092 output ensures stability. The LP78092 still works well comparator to monitor the SET pin. When the SET pin voltage with output capacitor of other types due to the wide stable ESR falls below 100mV for longer than tTERM (typically 1ms), range. Output capacitor of larger capacitance can reduce noise charging is terminated. The charge current is latched off and the and improve load transient response, stability, and PSRR. The LP78092 enters standby mode, where the input supply current output capacitor should be located not more than 0.5 inch from drops to 200µA. (Note: C/10 termination is disabled in trickle the VOUT pin of the LP78092 and returned to a clean analog charging and thermal limiting modes). ground. When charging, transient loads on the BAT pin can cause the SET pin to fall below 200mV for short periods of time before the Normal Charge Cycle DC charge current has dropped to 1/10th the SET rammed A charge cycle begins when the voltage at the V IN pin rises above the UVLO threshold level and a 1% SET ram resistor is connected from the SET pin to ground or when a battery is connected to the charger output. If the BAT pin is less than 2.9V, the charger enters trickle charge mode. In this mode, the LP78092 supplies approximately 1/10 the SET rammed charge current to bring the battery voltage up to a safe level for full value. The 1ms filter time (tTERM) on the termination comparator ensures that transient loads of this nature do not result in premature charge cycle termination. Once the average charge current drops below 1/10th the SET rammed value, the LP78092 terminates the charge cycle and ceases to provide any current through the BAT pin. In this state, all loads on the BAT pin must be supplied by the battery. current charging. LP78092 – 00 Version 1.0 Feb.-2014 Email: [email protected] www.lowpowersemi.com Page 8 of 10 Preliminary Datasheet LP78092 The LP78092 constantly monitors the BAT pin voltage in Automatic Recharge standby mode. If this voltage drops below the 4.05V recharge Once the charge cycle is terminated, the LP78092 continuously threshold (VRESTAT), another charge cycle begins and current is monitors the voltage on the BAT pin using a comparator with a once again supplied to the battery. To manually restart a charge 2ms filter time (tRECHARGE). A charge cycle restarts when the cycle when in standby mode, the input voltage must be battery voltage falls below 4.05V (which corresponds to removed and reapplied, or the charger must be shut down and approximately 80% to 90% battery capacity). This ensures that restarted using the SET pin. Figure 2 shows the state diagram the battery is kept at or near a fully charged condition and of a typical charge cycle. eliminates the need for periodic charge cycle initiations. STAT output enters a strong pull-down state during recharge cycles. Charge Status Indicator (STAT) The charge status output has two different states: strong pull-down (~10mA) and high impedance. The strong pull-down Start-up Function state indicates that the LP78092 is in a charge cycle. Once the charge cycle has terminated, the pin state is determined by under voltage lockout conditions. High impedance indicates that the LP78092 is in under voltage lockout mode: either V IN is less than 100mV above the BAT pin voltage or insufficient voltage is applied to the V IN pin. A microprocessor can be used to distinguish between these two states—this method is discussed in the Applications Information section. Function CHRG(pin15) STDBY(pin14) Charging Low High charge completed High Low The LP78092 features an LDO regulator enable/disable function. To assure the LDO regulator will switch on, the EN turn on control level must be greater than 1.4 volts but not above Vin+0.3V. The LDO regulator will go into the shutdown Thermal Limiting An internal thermal feedback loop reduces the ISET rammed charge current if the die temperature attempts to rise above a preset value of approximately 120°C. This feature protects the LP78092 from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit mode when the voltage on the EN pin falls below 0.4 volts. For protecting the system, the LP78092 have a quick-discharge function. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. board without risk of damaging the LP78092. The charge Feedback Capacitor and Voltage current can be set according to typical (not worst-case) ambient For adjustable version, connecting a 22pF between output pin temperature charger will and FB pin significantly reduces output voltage ripple, it is automatically reduce the current in worst-case conditions. critical that the capacitor connection should be direct and PCB TQFN-16 power considerations are discussed further in the traces should be as short as possible. Applications Information section. The output voltage of dual LDO could be set by the formula with the assurance that the below: Vout=VFB ×（1+R1/R2）， which VFB = 0.8V Considering the practical application, we may add a small capacitor with R1 in parallel which could be 33pF or 47pF. LP78092 – 00 Version 1.0 Feb.-2014 Email: [email protected] www.lowpowersemi.com Page 9 of 10 Preliminary Datasheet LP78092 Packaging Information TQFN-16 LP78092 – 00 Version 1.0 Feb.-2014 Email: [email protected] www.lowpowersemi.com Page 10 of 10