Miniature Integrated High Current Lithium-Ion Battery Charger

www.DataSheet4U.com POWER MANAGEMENT POWER MANAGEMENT Description Style Name _GreenBarText Description SC805A Miniature Integrated High Current Lithium-Ion Battery Charger Features Features  Fully integrated charger with FET pass transistor, Reverse-blocking diode, sense resistor and thermal protection  High accuracy charge current*  Tiny 3mm x 3mm 0-lead MLPD package  Programmable pre-charge, fast-charge and termination current  Battery voltage controlled to % accuracy  Built-in timer for protection and complete charging  NTC interface with battery detection  Soft-start to reduce adapter in-rush current  Up to A continuous charge current  Input voltage range from 3V to 6V allows seamless charging from current limited adapter Applications  Provides adapter voltage VCCIL to power external accessories  Battery present detection and output indicator  Operates in charger or LDO-Mode without battery  0.µA battery drain current in shutdown and monitor modes  Over-current protection in all charging modes  CHRGB output communicates charging and end-of-charge cycle *US Patent 6,836,095 The SC805A is a fully integrated, single cell, constantcurrent (CC)/constant-voltage (CV) Lithium-Ion battery charger in a tiny 3x3 mm thermally enhanced lead-free MLP package. The SC805A can operate as a stand-alone charger or in conjunction with a Power Management Integrated Circuit (PMIC). The SC805A 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 SC805A switches to CV regulation mode. In this mode the output current decays as the battery charges until the termination current is reached and the SC805A signals the charge cycle is complete. The SC805A can be configured to continue charging for a pre-determined time before turning off, or to turn off immediately upon termination. After turning off its output, the SC805A enters monitor mode. If the battery voltage drops by 00mV 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 ¼ of the total programmed charge duration. The SC805A also provides battery detection, and a battery NTC thermistor interface to disable charging when the battery temperature exceeds safe-to-charge limits. The SC805A can also function as a general purpose current source or as a current source for charging nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries. Applications        Cellular Phones PDAs Handheld Meters Charging Stations USB Chargers Digital Cameras Programmable Current Source Typical Application Circuit SC805A CHARGER VIN SC805A Typical Application Circuit C1 1µF D1 LED R2 3.01k 1 VCC VOUT 2 VCCIL CHRGB 7 EN/NTC ITERM 8 NOBAT IPRGM 9 RTIME GND 3 10 5 4 6 R4 3.01k Charge Complete Indicator D2 LED R5 3.01k D3 LED BATTERY C1 R6 1k R7 1k 2.2µF Adapter Present Indicator R1 3.01k RT1 Thermistor R3 39.2k Charging Indicator March 3, 2007  www.semtech.com www.DataSheet4U.com SC805A POWER MANAGEMENT Absolute Maximum Rating 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 TPKG TSTG 2 40(1) 150 -40 to +85 260 -65 to 150 Continuous IOUT_TOT 1 Notes: () Calculated from package in still air, mounted to 3” to 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD5 standards. Electrical Characteristics Unless otherwise noted: VCC = 4.75V - 5.25V. Parameter Input Voltage Symbol Condition Min 25°C Typ 5 Max TA (-40°C to +85°C) Min 3.5 Max 5.9 1 1.55 1 4.16 44 44.5 4.24 54 Units V µA mA µA V ICCDIS Operating Current ICCCHG IleakBAT VBAT IPREQ Shutdown Mode, EN = 0 Charging Mode CHRGB, ITERM, IPRG = 0µA VCC = 0V Vbat load = 75mA 0.1 1.2 0.1 4.20 50 Battery Leakage Current Regulated Voltage Battery Pre-Charge Current Battery Termination Current  2007 Semtech Corp. ITERM Resistor = 3.01k ITERMQ 50 53.6 mA 2 www.semtech.com www.DataSheet4U.com SC805A POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter Battery Fast-Charge Current(1) Symbol Condition Min IFastQ1 IFastQ2 IPRGM = 15k IPRGM = 1.87k VBATTERY = 3.8V Dropout Voltage = 500mV Battery Fast-Charge Max Current Limit IProg Regulated Voltage ITerm Regulated Voltage Vin OVP Rising Threshold Vin OVP Falling Theshold Vin OVP Hysteresis Vin UVLO Rising Threshold Vin UVLO Falling Threshold Vin UVLO Hysteresis Vbat Pre-Charge Threshold Vbat Recharge Threshold Pre-Charge Fault Time-Out Charge Complete Time-Out Time Disable Threshold LDO-Mode Select Threshold VIPRGM VITERM VTOVPR VTOVPF VTOVPH VTUVLOR VTUVLOF VTUVLOH VTPREQR VTREQ TPQFAULT TFASTQ VTTIMER VTIINTTS VBAT - VBATTERY Rtime = 39.2k Rtime = 39.2k Rtime VIL Voltage VCC-Rtime Voltage 2.8V < VBATTERY < VBAT 1.5 1.5 6.8 6.4 375 2.8 2.75 50 2.8 100 38 2.5 1.0 1.1 2.5 30 2.7 60 30.7 2.0 0.7 0.7 2.9 140 44.7 3.0 1.42 1.42 6.4 5.9 150 3.5 3.25 1.0 1.58 1.58 7.5 7.15 A V V V V mV V V mV V mV min hrs V V 25°C Typ 100 787 Max TA (-40°C to +85°C) Min 91.5 -5 Max 111.5 +5 mA % Units  2007 Semtech Corp. 3 www.semtech.com www.DataSheet4U.com SC805A POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter Symbol VTDIS VTNTCH En-NTC Thresholds VTNTCC VTNOBAT NTCHYS Over-Temperature Shutdown OT VCBVOH CHRGB LED Output VCBVOL ICBOFF VNBVOH NOBAT Output INBOFF VCCIL Resistance Reduced Fast-Charge Current VCCILR lfqRed Condition Min SC805A 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, 1 = 100mA Vout = 3.8V, Rprog = 1.87k, VCCIL Load = 200mA 25°C Typ < 1.1 0.3VCC 0.75VCC 0.95VCC 50 150 4.5 0.2 0.1 4.8 0.1 0.2 585 545 625 4.5 1.0 4.3 0.05 5.0 0.5 1.0 Max TA (-40°C to +85°C) Min 0.7 0.294VCC 0.314VCC 0.736VCC 0.756VCC 0.93VCC 0.97VCC Max V V V V mV °C V V µA V µA Ω mA Units Note: (1) Charge current is reduced by VCCIL current. VCCIL current is not limited by the IC.  2007 Semtech Corp. 4 www.semtech.com www.DataSheet4U.com SC805A Ordering Information Device Top View POWER MANAGEMENT Pin Configuration Package(1) MLP-10 Evaluation Board SC805AMLTRT(2) 10 9 CHRGB RTIME NOBAT EN/NTC GND VCC VCCIL VOUT IPRGM ITERM 1 2 3 4 5 SC805AEVB SC805A T 8 7 6 Notes: () Only available in tape and reel packaging. A reel contains 3000 devices. (2) Lead-free product. This product is fully WEEE and RoHS compliant. MLP-10 3mm x 3mm 10 Lead Marking Information 805A yyww xxxx Marking for the 3x3mm MLPD-10 Lead Package: nnnn = Part Number (Example: 805A) yyww = Datecode (Example: 0652) xxxx = Semtech Lot No. (Example: E901)  2007 Semtech Corp. 5 www.semtech.com www.DataSheet4U.com SC805A POWER MANAGEMENT Block Diagram VCC 1 Reference Voltages GND 6 Control NOBAT 8 Vout Ref Fast-Charge Ref Pre- Charge Ref VCCIL 2 Pre-Charge On Fast-Charge On Over-Temp Under-Voltage Over-Voltage EN/NTC 7 RTIME 9 CHRGB 10 NTC Interface Timer VOUT 3 IPRGM 4 ITERM 5 Pre-Charge Ref Fast-Charge Ref VOUT Vout Ref  2007 Semtech Corp. 6 www.semtech.com www.DataSheet4U.com SC805A POWER MANAGEMENT Pin Descriptions (Cont.) Pin 1 2 3 4 5 6 7 8 9 Pin Name VCC VCCIL VOUT IPRGM ITERM GND EN/NTC NOBAT RTIME Pin Function Supply pin – connect to adapter power Adapter input voltage – this pin provides a bias voltage approximately equal to the adapter input voltage. When charging, the output current 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’ completed to this pin to indicate charge complete. Pad is for heatsinking purposes – not connected internally. Connect exposed pad to ground plane with thermal vias directly under pad. 10 T CHRGB Thermal Pad  2007 Semtech Corp. 7 www.semtech.com www.DataSheet4U.com SC805A POWER MANAGEMENT Applications Information General Operation The SC805A is configured based on the application for fastcharge 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 pr