Miniature Integrated High Current Lithium-Ion Battery Charger

www.DataSheet4U.com Miniature Integrated High Current Lithium-Ion Battery Charger Features Fully integrated charger with FET pass transistor, reverse-blocking diode, sense resistor and thermal protection High Accuracy Charge Current* Tiny 3mm x 3mm 10 lead MLP package Programmable precharge, fastcharge & termination current Battery voltage controlled to 1% accuracy Built in timer for protection and complete charging NTC interface with battery detection Soft-start for step load and adaptor plug-in Up to 1A continuous charge current Input voltage range from 3V to 6V allows seamless charging from current limited adapter Provides adapter voltage VCCIL to power external accessories Battery Present detection and output indicator Operates in charger or LDO-mode without battery 0.1µA battery drain current in shutdown and monitor modes Over current protection in all charging modes CHRGB output communicates charging and end of charge cycle *Patent Pending SC805 POWER MANAGEMENT Description The SC805 is a fully integrated, single cell, constant-current (CC)/constant-voltage (CV) Lithium-Ion battery charger in a tiny 3x3 mm thermally enhanced lead free MLP package. The SC805 can operate as a stand-alone charger or in conjunction with a Power Management Controller (PMIC). The SC805 has a pre-charge function for trickle charging deeply discharged batteries. The fast charge current is enabled automatically when the battery voltage reaches the required threshold. When the battery reaches the constant voltage or CV portion of the charge curve the SC805 switches to CV regulation mode. In this mode the output current decays as the battery charges until the termination current is reached and the SC805 signals the charge cycle is complete. The SC805 can be configured to continue charging for a predetermined time before turning off, or to turn off immediately upon termination. After turning off its output, The SC805 enters monitor mode. If the battery voltage drops by 100mV from the CV voltage a new charge cycle will begin. The timer function also protects against charging faulty batteries by turning off if the pre-charge time exceeds 1/4 of the total programmed charge duration. The SC805 also provides battery detection, and a battery NTC thermistor interface to disable charging when the battery temperature exceeds safe-to-charge limits. The SC805 can also function as a general purpose current source or as a current source for charging nickelcadmium (NiCd) and nickel-metal-hydride (NiMH) batteries. Applications Cellular phones PDA’s Handheld meters Charging stations USB chargers Digital cameras Programmable current source Charge Complete Indicator Typical Application Circuit SC805 VCC VOUT VCCIL CHRGB EN/NTC ITERM NOBAT IPRGM RTIME GND SC805 typical Application Circuit CHARGER VIN C1 1uF D1 LED R2 3.01k 1 2 7 8 9 3 10 5 4 6 R4 3.01k D2 LED R5 3.01k D3 LED BATTERY C1 R6 1k R7 1k 2.2uF Adapter Present Indicator R1 3.01k RT1 Thermistor R3 3.01k t Charging Indicator August 22, 2005 1 www.semtech.com www.DataSheet4U.com SC805 POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter VCC, VCCIL, EN/NTC to GND VOUT, NOBAT, IPRGM, CHRGB, ITERM, RTIME to GND Power Dissipation MLP (Derate 20mW/ °C above 85°C) Thermal Impedance, Junction to Case Junction Temperature Operating Ambient Temperature Range Peak IR Reflow temperature, soldering 20s-40s Storage Temperature Range VOUT short to GND IVCCIL + IVOUT Total Output Current Symbol Maximum -0.3 to 7.0 -0.3 to +6.0 Units V V W °C/W °C °C °C °C A A Pd θJA TJ TA TLEAD TSTG 2 50* 150 -40 to +85 260 -65 to 150 Continuous IOUT_TOT 1 *Calculated from package in still air, mounted to 3” to 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. Electrical Characteristics Unless otherwise noted: VCC = 4.75V - 5.25V Parameter Symbol Conditions Min 25oC Typ 5 Max TA (-40oC to +85°C) Min 3.15 Max 5.9 1 2.25 1 4.16 44 44.5 91.5 -5 4.24 54 53.5 111.5 +5 Units Input Voltage Operating Current ICCDIS ICCCHG Battery Leakage Current Regulated Voltage Battery Pre-Charge Current Battery Termination Current Battery Fast-Charge Current IleakBAT VBAT*** IPREQ ITERM Resistor R = 3.01k ITERMQ IFastQ1 IFastQ2 IPRGM = 15k IPRGM = 1.87k VBATTERY = 3.8V Dropout Voltage = 550mV 2.8V < VBATTERY < VBAT VIPRGM VITERM Shutdown Mode, EN = 0 Charging Mode CHRGB, ITERM, IPRG = 0µA V C C = 0V V µA mA µA V 0.1 1.2 0.1 4.20 50 50 100 787 mA mA % Battery Fast-Charge Max Current Limit Iprog Regulated Voltage Iterm Regulated Voltage 1.0 1.5 1.5 1.4 1.4 1.6 1.6 A V V  2005 Semtech Corp. 2 www.semtech.com www.DataSheet4U.com SC805 POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter Symbol Conditions 25oC TA (-40oC to +85oC) Max Min 6.4 6.0 5.9 150 2.55 2.5 30 2.7 60 30.7 2.0 0.7 0.7 0.7 0.294Vcc 0.736Vcc 0.93Vcc 0.314Vcc 0.756Vcc 0.97Vcc 2.9 140 44.7 3.0 3.15 3.1 Max 7.5 7.15 V V mV V V mV V mV min hrs V V V V V V mV ° Units Min Vin OVP Rising Threshold Vin OVP Falling Threshold Vin OVP Hysteresis Vin UVLO Rising Threshold Vin UVLO Falling Threshold Vin UVLO Hysteresis Vbat Precharge Threshold Vbat Recharge Threshold Pre-Charge Fault Time-Out Charge Complete Time-Out Timer Disable Threshold LDO-Mode Select Threshold En-NTC Thresholds VTOVPR VTOVPF VTOVPH VTUVLOR VTUVLOF VTUVLOH VTPREQR VTREQ TPQFAULT TFASTQ VTTIMER VTIINTTS VTDIS VTNTCH VTNTCC VTNOBAT NTCHYS Over Temperature Shutdown CHRGB LED Output OT VCBVOH VCBVOL ICBOFF NoBat Output VNBVOH INBOFF VCCIL Resistance Reduced Fastcharge Current VCCILR IfqRed VBAT - VBATTERY Rtime=39.2k Rtime=39.2k Rtime VIL Voltage VCC-RTIME Voltage SC805 disable NTC Hot Vth Vcc=5 NTC Cold Vth Vcc=5 No Battery Detect Vcc=5 Hot/Cold Hysteresis Hysteresis = 10°C Charge Complete Isrc=2mA Charging Isnk=2mA Disable or LDO-mode off leakage EN=VCC, Isrc=1mA EN=VCC/2 off leakage R VCC to VCCIL, I=100mA Vout=3.8v, Rprog=1.87k VCCIL load = 200mA Typ 6.8 6.4 375 2.8 2.75 50 2.8 100 38 2.5 1.0 1.1 < 1.1 0.3VCC 0.75VCC 0.95VCC 50 150 4.5 0.2 0.1 4.8 0.1 0.2 585 C 4.3 0.05 5.0 0.5 1.0 V V µA V 4.5 1.0 µA W 545 625 mA * Tied to PCB with 1 Square Inch, 2 Ounce Copper. Tja=41°C/W using JESD 51 Standard ** Charge current is reduced by VCCIL current. VCCIL current is not limited by the IC *** Vbat load=75mA. See typical performance curves for load regulation.  2005 Semtech Corp. 3 www.semtech.com www.DataSheet4U.com SC805 Ordering Information Top View Device (1) POWER MANAGEMENT Pin Configuration P ackag e MLP-10 Evaluation Board SC805IMLTRT(2) VCC VCCIL VOUT IPRGM ITERM 1 2 3 4 5 10 9 8 7 6 CHRGB RTIME NOBAT EN/NTC GND S C 805E V B Note: (1) Only available in tape and reel packaging. A reel contains 3,000 devices. (2) Available in lead-free packaging only. This product is fully WEEE and RoHS compliant. MLP10: 3x3 10 Lead Pin Descriptions Pin # 1 2 3 4 5 6 7 Pin Name VC C VCCIL VOUT IPRGM ITERM GND EN/NTC Pin Function Supply pin, connect to adaptor power. Adapter input voltage. This pin provides a bias voltage approximately equal to the adapter input voltage. The output current when charging will be reduced by the load current on VCCIL. Charger output, connect to battery. Current limit program pin for charge and LDO-mode. Requires a resistor to ground to program fast-charge current. Selection for current termination and pre-charge current. Requires a resistor to ground to program pre-charge and termination current. Ground Combined device enable/disable and NTC input pin. Logic low disables the device. Analog voltages between 0.3VCC and 0.75VCC enable the NTC function. Voltages above 95% of VCC force the NOBAT output high. Battery Present Indicator. This output goes high when the NTC voltage exceeds 95% of VCC indicating the Battery and NTC have been removed. Charge time programming resistor. Connect a resistor between RTIME and GND to program the charge time. Force the pin to GND to disable the timer. Force the pin to VCC to select LDO-mode. Output status indicator designed to drive two LEDs. Connect cathode of the 'charging' led to this pin to indicate charge in progress. Connect the anode of the 'charge complete' led to this pin to indicate charge complete. 8 9 NOBAT RTIME 10 CHRGB  2005 Semtech Corp. 4 www.semtech.com www.DataSheet4U.com SC805 POWER MANAGEMENT Block Diagram VCC 1 Reference Voltages GND 6 Control Vout Ref Fast Charge Ref Pre-Charge Ref VCCIL 2 Pre-Charge On Fast-Charge On Over Temp Under Voltage Over Voltage NOBAT 8 EN/NTC 7 RTIME 9 CHRGB 10 NTC Interface Timer VOUT 3 IPRGM 4 Fast Charge Ref ITERM 5 VOUT Vout Ref Pre-Charge Ref  2005 Semtech Corp. 5 www.semtech.com www.DataSheet4U.com SC805 POWER MANAGEMENT Applications Information General Operation The SC805 is configured based on the application for Fast Charge and Termination current, timing requirements, and operation with and without a battery (LDO mode). A typical charging cycle is described below. Details on alternate applications and output programmability are covered in the individual sections. The charging cycle begins when the adapter is plugged in. The SC805 performs glitch filtering on the VCC input and initiates a charge cycle when VCC > UVLO. At this time, the CHRGB signal is active low turning on the charging LED. If the battery voltage is less than 2.8V, the SC805 will charge the output with the pre-charge current. When the battery voltage exceeds 2.8V, the SC805 enters fast-charge or constant current (CC) mode. When the battery voltage reaches its final value, the charger enters the constant voltage (CV) mode. In this mode the output current decreases as the battery continues to charge until the termination current level is reached. The CHRGB pin goes high when