EC49016 E-CMOS | Alldatasheet

Document overview

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Technical content

Features

/circle6 Programmable Charge Current Up to 800mA /circle6 No MOSFET, Sense Resistor or Blocking Diode Required /circle6 Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge Rate without Risk of Overheating /circle6 Charges Single Cell Li-ion Batteries Directly from USB Port /circle6 Preset 4.22V Charge Voltage with +-1% Accuracy /circle6 20 μA Supply Current in Shutdown /circle6 2.9V Trickle Charge Threshold /circle6 Soft-Start Limits Inrush Current /circle6 Available in 5-Lead SOT-23 Package

Applications

/circle6 Cellular Telephones, PDA, MP3 Players /circle6 Charging Docks and Cradles /circle6 Bluetooth Applications Pin Configuration 016b* Application Diagram

Standalone Linear Lithium Battery Charger E-CMOS Corp. ( www.ecmos.com.tw ) Page 2 of 10 5F04N Rev. F002 EC49016

Ordering Information

(1) Parameter Symbol Value Units Input Supply Voltage V CC 7 V PROG Voltage V PROG VCC+0.3 V BAT Voltage V BAT 7 V CHRG Voltage V CHRG 7 V BAT Short-Circuit Duration — Continuous — Thermal Resistance, Junction-to-Ambient ΘJA 250 ° C/W BAT Pin Current I BAT 800 mA PROG Pin Current I PROG 800 µA Maximum Junction Temperature T J 125 ° C Storage Temperature T S -65 to +125 ° C Lead Temperature (Soldering, 10 sec) — 300 ° C Recommended Operating Conditions (2) Parameter Symbol Value Units Supply Input Voltage V IN -0.3 to +7 V Junction Temperature T J -40 to +85 ° C Package Part Number Marking Marking Information SOT-23-5L EC49016B2-F 016 b Starting with 6, a bar on top of 6 is for production year 2005, and underlined 6 is for year 2006. The naming pattern continues with consecutive characters for later years. The last character is the week code. (A-Z: 1-26, a- 27-52) A dot on top right corner is for lead-free process. E C 4 9 0 1 6 X - F P a c k a g e : B 2 = S O T -2 3 -5 L F : L e a d -F re e

Standalone Linear Lithium Battery Charger E-CMOS Corp. ( www.ecmos.com.tw ) Page 3 of 10 5F04N Rev. F002 EC49016

Electrical Characteristics

VIN = 5V; T J = 25° C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VCC Input Supply Voltage 3.5 — 6 V Charge Mode (3) , R PROG = 10k — 110 500 µA Standby Mode (Charge Terminated) — 70 — µA ICC Input Supply Current Shutdown Mode(R PROG Not Connected, VCC < V BAT , or V CC < V UV ) — 20 40 µA VFLOAT Regulated Output (Float) Voltage IBAT = 30mA, ICHRG = 5mA 4.15 4.22 4.3 V R PROG = 10k, Current Mode 90 110 130 mA R PROG = 2k, Current Mode — 500 — mA Standby Mode, VBAT = 4.2V 0 +/-1 +/-5 µA Shutdown Mode (R PROG Not Connected) — +/-0.5 +/-5 µA IBAT BAT Pin Current Sleep Mode, V ITRIKL Trickle Charge Current V BAT < V TRIKL , R PROG = 10k — 10 — mA VTRIKL Trickle Charge Threshold Voltage R PROG = 10k, V BAT Rising 2.8 2.9 3.0 V VIN = 5V; T J = 25° C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VUV V CC Undervoltage Lockout Threshold From V CC Low to High — 3.4 — V VUVHYS V CC Undervoltage Lockout Hysteresis — 100 — mV PROG Pin Rising — 1.25 — V VMSD Manual Shutdown Threshold Voltage PROG Pin Falling — 1.2 — V VCC from Low to High — 100 — mV VASD VCC – V BAT Lockout Threshold Voltage VCC from High to Low — 30 — mV R PROG = 10k (4) — 10 — mA ITERM C/10 Termination Current Threshold R PROG = 2k — 50 — mA VPROG PROG Pin Voltage R PROG = 10k, Current Mode 0.9 1.03 1.1 V ICHRG CHRG Pin Weak Pull-Down Current V CHRG = 3V — 15 — µA VCHRG CHRG Pin Output Low Voltage I CHRG = 5mA — 0.6 — V ΔVRECHRG Recharge Battery Threshold Voltage VFLOAT - V RECHRG — 100 — mV TLIM Thermal Protection Temperature — 120 — ° C tSS Soft-Start Time I BAT = 0 to 1000V/R PROG — 100 — µs tRECHARGE Recharge Comparator Filter Time V BAT High to Low — 1 — ms tTERM Termination Comparator Filter Time I BAT Falling Below I CHG /10 — 1000 — µs

Standalone Linear Lithium Battery Charger E-CMOS Corp. ( www.ecmos.com.tw ) Page 4 of 10 5F04N Rev. F002 EC49016 VIN = 5V; T J = 25° C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit IPROG PROG Pin Pull-Up Current — 1 — µA Note 1: Exceeding the absolute maximum rating may damage the device. Note 2 : The device is not guaranteed to function outside its operating rating. Note 3: Supply current includes PROG pin current (approximately 100µA) but does not include any current delivered to the battery through the BAT pin (approximately 100mA). Note 4: I TERM is expressed as a fraction of measured full charge current with indicated PROG resistor. Pin Functions Pin Pin Function Description Pin Pin Function Description VCC Positive Input Supply Voltage . Provides Power to charger. VCC can range from 3.5 to 6.5V and should be bypassed W ith at least a 1uF capacitor. CHRG Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 20uA is connected to the CHRG pin, indicating an “AC present” condition. GND Ground PROG Charge Current Program, Charge Current Monitor and shutdown pin BAT Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.22V

Standalone Linear Lithium Battery Charger E-CMOS Corp. ( www.ecmos.com.tw ) Page 5 of 10 5F04N Rev. F002 EC49016 Block Diagram

Standalone Linear Lithium Battery Charger E-CMOS Corp. ( www.ecmos.com.tw ) Page 6 of 10 5F04N Rev. F002 EC49016 Float Voltage vs Supply Voltage 4.185 4.190 4.195 4.200 4.205 4.210 4.215 4.220 4.225 4.230 VCC (V) V BAT (V) RPROG =10k TA=25 ℃ Charge Current vs Supply Voltage 100 200 300 400 500 600 VCC (V) IBAT (m A) RPROG =2k R PROG =10k V BAT =4V TA=25 ℃ ONSET OF THERMAL REGULATION Trickle Charge Current vs Supply Voltage VCC (V) IT R IKL (mA) R PROG =2k VBAT =2.5V TA=25 ℃ RPROG =10k Float Voltage vs Temperature 4.185 4.190 4.195 4.200 4.205 4.210 4.215 20 40 60 80 100 120 Temperature ( ℃) V FLOAT (V) Operation The EC49016 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage accuracy of ±2%. The EC49016 includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only two external components. Furthermore, the EC49016 is capable of operating from a USB power source. Typical Performance Characteristics

Standalone Linear Lithium Battery Charger E-CMOS Corp. ( www.ecmos.com.tw ) Page 7 of 10 5F04N Rev. F002 EC49016 Normal Charge Cycle A charge cycle begins when the voltage at the VCC pin rises above the UVLO threshold level and a 1% program resistor is connected from the PROG pin to ground or when a battery is connected to the charger output. If the BAT pin is less than 2.8V, the charger enters trickle charge mode. In this mode, the EC49016 supplies approximately 1/10 the programmed charge current to bring the battery voltage up to a safe level for full current charging. When the BAT pin voltage rises above 2.8V, the charger enters constant-current mode, where the programmed charge current is supplied to the battery. When the BAT pin approaches the final float voltage (4.22V), the EC49016 enters constant-voltage mode and the charge current begins to decrease. When the charge current drops to 1/10 of the programmed value, the charge cycle ends. Programming Charge Current The charge current is programmed using a single resistor from the PROG pin to ground. The battery charge current is 1100 times the current out of the PROG pin. The program resistor and the charge current are calculated using the following equations: PROG CHG CHG PROG R VII VR 1100 ,1100 == , The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage using the following equation: 1100 •= PROG PROG BAT R VI This actual current will vary from IC to IC. The typical variation is within +/-20%. Charge Termination A charge cycle is terminated when the charge current falls to 1/10th the programmed value after the final float voltage is reached. This condition is detected by using an internal, filtered comparator to monitor the PROG pin. When the PROG pin voltage falls below 100mV for longer than tTERM (typically 1ms), charging is terminated. The charge current is latched off and the EC49016 enters standby mode, where the input supply current drops to 200mA. (Note: C/10 termination is disabled in trickle charging and thermal limiting modes).When charging, transient loads on the BAT pin can cause the PROG pin to fall below 100mV for short periods of time before the DC charge current has dropped to 1/10th the programmed 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 programmed value, the EC49016 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. The EC49016 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the 4.05V recharge threshold (V RECHRG ), another charge cycle begins and current is once again supplied to the battery. To manually restart a charge cycle when in standby mode, the input voltage must be removed and reapplied, or the charger must be shut down and restarted using the PROG pin. Figure 1 shows the state diagram of a typical charge cycle. 1000V 1000V 1000

that the charger will automatically reduce the current in worst-case conditions. mode until VCC raises 100mV above the battery voltage. Figure 1. State Diagram of a Typical Charge Cycle

Standalone Linear Lithium Battery Charger E-CMOS Corp. ( www.ecmos.com.tw ) Page 9 of 10 5F04N Rev. F002 EC49016 Stability Considerations The constant-voltage mode feedback loop is stable without an output capacitor provided a battery is connected to the charger output. With no battery present, an output capacitor is recommended to reduce ripple voltage. When using high value, low ESR ceramic capacitors, it is recommended to add a 1 Ω resistor in series with the capacitor. No series resistor is needed if tantalum capacitors are used. In constant-current mode, the PROG pin is in the feedback loop, not the battery. The constant-current mode stability is affected by the impedance at the PROG pin. With no additional capacitance on the PROG pin, the charger is stable with program resistor values as high as 20k. However, additional capacitance on this node reduces the maximum allowed program resistor. The pole frequency at the PROG pin should be kept above 100kHz. VCC Bypass Capacitor Many types of capacitors can be used for input bypassing, however, caution must be exercised when using multilayer ceramic capacitors. Because of the self-resonant and high Q characteristics of some types of ceramic capacitors, high voltage transients can be generated under some start-up conditions, such as connecting the charger input to a live power source. Adding a 1.5 Ω resistor in series with a ceramic capacitor will minimize start-up voltage transients. Power Dissipation The conditions that cause the EC49016 to reduce charge current through thermal feedback can be approximated by considering the power dissipated in the IC. Nearly all of this power dissipation is generated by the internal MOSFET—this is calculated to be approximately: PD = (V CC – V BAT ) • I BAT The approximate ambient temperature at which the thermal feedback begins to protect the IC is: TA = 120° C – P D θJA TA = 120° C – (V CC – V BAT ) • I BAT • θJA Thermal Considerations Because of the small size of the thin SOT23 package, it is very important to use a good thermal PC board layout to maximize the available charge current. The thermal path for the heat generated by the IC is from the die to the copper lead frame, through the package lead, (especially the ground lead) to the PC board copper. The PC board copper is the heat sink. The footprint copper pads should be as wide as possible and expand out to larger copper areas to spread and dissipate the heat to the surrounding ambient. Other heat sources on the board, not related to the charger, must also be considered when designing a PC board layout because they will affect overall temperature rise and the maximum charge current. Application Hints

Standalone Linear Lithium Battery Charger E-CMOS Corp. ( www.ecmos.com.tw ) Page 10 of 10 5F04N Rev. F002 EC49016 OUTLINE DRAWING SOT-23-5L DIMENSIONS DIMN INCHES MM MIN MAX MIN MAX A 0.110 0.120 2.80 3.05 B 0.059 0.070 1.50 1.75 C 0.036 0.051 0.90 1.30 D 0.014 0.020 0.35 0.50 E – 0.037 – 0.95 F – 0.075 – 1.90 H – 0.006 – 0.15 J 0.0035 0.008 0.090 0.20 K 0.102 0.118 2.60 3.00 B K A F D E C H J