CM9101-00QE

PRELIMINARY CM9101 Compact Cost-effective Fast Charger Features • • • • • Monolithic linear charger requires no inductors, external sense resistors or blocking diodes A few external components are required 4.75V to 6.5V operating input voltage range. Battery temperature monitor with thermistor (NTC) interface Programmable the charging current to achieve the fastest charging rate without the risk of overloading the adapter Thermal limit control of charging current prevents overheating Maximum of 1µA battery drain current Charging-current monitor output for system super­ vision of charging status TQFN-16, RoHS compliant lead-free package Product Description The CM9101 is an integrated linear-mode charger for single-cell, Lithium-ion batteries. It designed for com­ pact and cost-sensitive handheld devices. It provides programming charge current, batter y temperature monitoring, charge status indicator, charge termina­ tion, high accuracy fast charge current and automatic charge voltage regulation. It requires no external block­ ing diodes or current sense resistors and needs only one external resistor to program the charging current. The CM9101 provides Precharge, Fast-charge (con­ stant-current), and Termination (constant-voltage) charging modes. The Precharge/Termination currents are preset to 10/5% of the Fast-charge current level. A host system can monitor the actual charge current at the ISET pin. The batter y temperature can continuously measured by an external thermistor through the THERM pin. When the chip temperature reach 140°C, the CM9101 goes into a latched shutdown mode stop charging until the chip temperature is below 140°C will gradually charge and 105°C resume fast charge. When the adapter is not present, the CM9101 draws less than 1µA of drain current from the battery in ultra low power sleep mode. The CM9101 is packaged in a miniature 16-pin TQFN. It can operate over the ambient temperature range of ­ 40°C to 85°C. • • • • Applications • • • • Cellular phones and smar t phones PDAs Por table Media Viewers Digital Still Camera Cradle Chargers Typical Application Vin VIN 4.7u 5k VSTB BSEN 1u Vout 4k 4.7u GND ISET ENA VREF CM9101 VOUT THERM STAT 1k 10k Li-ion Battery 0. 1u © 2006 California Micro Devices Corp. All rights reserved. 06/30/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 1 PRELIMINARY CM9101 Package Pinout PACKAGE / PINOUT DIAGRAM TOP VIEW (Pins Down View) Pin 1 Marking VSTB VIN NC NC BOTTOM VIEW (Pins Up View) 13 14 15 16 15 14 13 NC GND NC VREF 1 12 BSEN 12 11 10 9 16 1 CM9100 00QE 2 3 4 11 VOUT 10 THERM 9 STAT GND PAD 2 3 4 8 7 6 ISET 5 ENA 6 NC 7 CM9101-00QE 16-Lead TQFN Package (4mm x 4mm) Note: This drawing is not to scale. LEAD(s) NAME NC GND NC VREF ISET DESCRIPTION No connect. Ground pin. No connect. 4.2V, 2 mA reference output pin. Pin to set the maximum charging current in the Fast charge (CC) mode. Also, reflects actual charging current. A resistor between this pin and ground sets the charge current, ICH: 2.5 V RISE T = 1000 × ---------------------------IC C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ENA NC NC STAT THERM VOUT BSEN VSTB NC NC VIN Enable pin. Logic high (default value) enables charging. Logic low disables charging. No connect. No connect. Charging status indicator pin (open-drain output). Thermistor input pin from battery monitoring circuit. Charger output pin. Batter y voltage remote sense pin. 4.2V output pin, connect a cap to ground to increase stability. No connect. No connect. Positive input supply voltage pin, which powers the charger. © 2006 California Micro Devices Corp. All rights reserved. 2 NC 8 PIN DESCRIPTIONS 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l 5 Fax: 408.263.7846 l www.cmd.com 06/30/06 PRELIMINARY CM9101 Ordering Information PART NUMBERING INFORMATION Lead Free Finish Pins 16 Package TQFN Ordering Part Number1 CM9101-00QE Part Marking CM9101 00QE Note 1: Par ts are shipped in Tape & Reel form unless otherwise specified. Specifications ABSOLUTE MAXIMUM RATINGS PARAMETER ESD Protection (HBM) VIN to GND Pin Voltages VOUT, VSTB to GND ENA, ISET, STAT to GND BSEN, THERM, VREF to GND Storage Temperature Range Operating Temperature Range (Ambient) Lead Temperature (Soldering, 10sec) RATING ±2 [GND - 0.3] to +6.5 [GND - 0.3] to +6.5 [GND - 0.3] to +6.5 [GND - 0.3] to +6.5 -65 to +150 -40 to +85 300 UNITS kV V V V V °C °C °C ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL VIN UVLO IQ PARAMETER VIN Supply Voltage UVLO Cut-in Threshold Quiescent Current CONDITIONS VIN All outputs are at no load Charging modes, exclud­ ing current to ISET and STAT pins. All outputs are at no load. VIN = 5.0V, ENA = low, excluding current to ISET and STAT pins. VIN = 0V (100Ω - resistor to ground), VBAT = 4.2V VBSEN < 3.2V 0.85 x IPR MIN 4.75 3.3 TYP 3.5 2 MAX 6.5 3.6 UNITS V V mA ISHDN Shutdown Supply Current 50 100 µA IDR Battery Drain Current 0.5 1 µA Charger Function IPR Precharge Mode Current 250 IPR = ----------------------R SET ( k Ω ) 3.30 1.14 x IPR mA VCC CC Mode Voltage Threshold 3.20 3.40 V © 2006 California Micro Devices Corp. All rights reserved. 06/30/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 3 PRELIMINARY CM9101 Specifications (cont’d) ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL ICC PARAMETER CONDITIONS CC Mode Charging Current, VBSEN > 3.5V MIN 0.92 x ICC TYP 2500 ICC = ----------------------RSE T ( k Ω ) 4.200 100 ITERM = ----------------------RSET ( k Ω ) 4.100 105 140 1.0 120 4.200 4.200 0.2 MAX 1.08 x ICC 4.210 1.2 x ITERM 4.110 125 150 1.1 150 4.210 4.300 1.0 0.1 0.5 1.5 0.4 VIN = 5.0V (Note 6) VIN = 5.0V (Note 6) 0.9 x VBH 0.9 x VBC 80 VBH = 0.5 x VIN VBC = 7/8 x VIN 100 1.1 x VBH 1.1 x VBC 120 UNITS mA VCV ITERM CV Mode Voltage Threshold Charge Termination Current VBSEN > 4.190V 4.190 0.8 x ITERM 4.090 (Note 2) (Note 3) (Note 4) ICC = 500mA IREF < 1mA 95 130 0.9 100 4.190 4.100 V mA VRCH CT OTPLIMIT OCPLIMIT RDSON VREF VREF VSTB VSTB Recharge Mode Threshold Constant-temperature Mode, Limit Over-temperature Protec­ tion, Limit Over-current Charging (OCP), Limit RDSON of Charger MOSFET Regulated Voltage VREF Regulated Voltage VSTB V C C A mΩ V V µA V V V V V V mV Control Function BSEN Pin Leakage Current VIN = 0 IBSEN STAT (Open Drain) Output ISINK = 5mA VSTAT Low Voltage ISINK = 20mA VIH EN VIL EN ENA Input High Level ENA Input Low Level Thermistor Function (Note 4, 5) Battery HOT Voltage VBH Threshold (THERM Pin) VBC Battery COLD Voltage Threshold (THERM Pin) Hysterezis of VBH, VBC Note 1: VIN = 5.0V. All outputs are on. TA = 25°C unless otherwise specified. Note 2: When chip temperature reaches 105°C, the IC’s internal thermal limit will maintain this temperature by decreasing the pro­ grammed charge current. Note 3: When chip temperature reaches 140°C, the IC goes into a latched shutdown mode. It stops charging, stops supplying VOUT). To resume the charging function, a toggle of VIN is required. Note 4: This feature can be disabled by connecting the THERM pin to GND. Note 5: This function requires a Thermistor connected between the THERM pin and GND. Another resistor connected between THERM pin and VIN is required, its value should equal the Thermistor Hot Value (at 50°C). In order to catch both the 0°C and 50°C thresholds (typical range for Li-ion batter y) use Thermistors following 7/1 ratio (Thermistor COLD/Thermistor HOT=7). Note 6: If the battery HOT/COLD detection identifies a condition outside the thresholds, the IC stops charging the battery and waits for the temperature to return to the normal value. © 2006 California Micro Devices Corp. All rights reserved. 4 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 06/30/06 PRELIMINARY CM9101 Typical Performance Curves Charging Algorithm Battery Emulator, Cbattery = 30 mF RISET = 5 kΩ Ichg_cc=500mA CV mode = 4.2V Bat t ery volt age Bat t ery volt age Charge current CC mode = 3.3V Charge current Ichg_pr=50mA Ichg_t erm=25mA T ime (2 m s/d iv) T ime (2 m s/d iv) Battery Current Thresholds Battery Voltage Thresholds Functional Block Diagram VIN OCP CM9101 Current Limit Qc VSTB VOUT BSEN Charger Control ENA THERM OTP GND Over-Temp Limit VREF LDO STAT ISET © 2006 California Micro Devices Corp. All rights reserved. 06/30/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 5 PRELIMINARY CM9101 Flow Chart 4.75 V< VIN 1A OC P Stop c harging and Latc h ; Set STA T=OFF OTP Tj > 150 oC Shutdown mode No Yes 2.5V 3.3V CC Mode Yes No Stop c harging Set STA T=OFF Set C C mode STA T=ON Charge Done or B attery is not present C V Mode Yes No ICH < Iterm No B SEN >= 4 .200 V Set C V Mode Yes Note: If Therm is used, during any charging mode removing a , battery will cause the CV mode, then termination, the equivalent to charge done Until the battery is returned the . charger will cycle between standby mode and recharge cycle. - © 2006 California Micro Devices Corp. All rights reserved. 6 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 06/30/06 PRELIMINARY CM9101 Application Information The CM9101 is an integrated charger with a charging profile tailored for single-cell graphite electrode (anode) Li-ion batteries. With single resistor charge current pro­ gramming, the CM9101 can provide charge currents up to 1A, or limited to 100mA/500mA for USB input applications. The charger features the three modes required for a safe and reliable Li-ion charging profile; Precharge, Fast-charge, and Termination charge. Extensive safety features include batter y temperature monitoring, volt­ age and current monitoring. A status indicator provides charge state information. into High Power mode, the circuit in Figure 1 can be used. Q1 can be the output of the controller. From USB VIN 500 m A 100 m A CM9101 VOUT 6.19k Q1 nmos ISET Charger BSEN 25.5k Figure 1. USB Input Circuit Linear Charger vs. Switching Charger A Li-ion battery charger can be either a switching or a linear regulator. A switching regulator type charger achieves higher efficiency, typical 90% or better, over a wide range of load and line conditions and generally offers a faster charging speed. However, a switching charger requires an external power inductor, which occupies substantial PC board space with added weight. Another issue with switching regulators is the switching noise and the potential EMI it generates. In contrast, The CM9101 linear charger is implemented with a single IC, without the use of an inductor. The CM9101 provides a complete Li-ion charging control system, with integrated power MOSFETs and several impor tant features, requiring just a few external resis­ tors and capacitors for a compact system design. A sophisticated thermal management system addresses the concerns commonly associated with linear charg­ ers. Charging Li-ion Batteries Once the CM9101 detects the presence of a valid AC adapter, and checks that the batter y voltage at BSEN is less then VIN and that the batter y temperature in within the correct range, it is ready to charge the Li-ion battery. If the batter y voltage is deeply discharged (less than 3.2V), the CM9101 will star t in the Precharge mode, charging at 10% of the programmed Fast-charge cur­ rent level. See Figure 2. While the battery is charging, the status pins will be set to STAT=0. The Precharge current will gradually bring the battery voltage to above 3.2V. Pr eCh ar g e 0. 8A CC Mod e CV Mod e Charging Volt age 4. 0V Input When using a constant-voltage, 5VDC nominal, AC adapter, the semi-regulated voltage to the charger, after accounting for the conduction losses through the power cord and connector contacts, is a voltage in the range of 5.0V to 6.0V. The USB standard specifies a 5.0V +/-5% bus voltage, capable of 500mA (High Power peripheral configura­ tion) of current. When using a USB input, the charging current must be limited to