EC49017 E-CMOS | Alldatasheet
Document overview
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Technical content
Features
Programmable Charge Current Up to 800mA No MOSFET, Sense Resistor or Blocking Diode Required Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge Rate without Risk of Overheating Charges Single Cell Li-ion Batteries Directly from USB Port Preset 4.22V Charge Voltage with ±1% Accuracy 20μ A Supply Current in Shutdown 2.9V Trickle Charge Threshold Soft-Start Limits Inrush Current Available in 6-Lead SOT23 and SOP-8(Exposed PAD) Packages RoHS Compliant and 100% Lead Pb free
Applications
Cellular Telephones, PDA, MP3 Players Charging Docks and Cradles Bluetooth Applications Pin Configuration Application Diagram
Standalone Linear Lithium Battery Charger EC49017
Ordering Information
Absolute Maximum Rating(1) Parameter Symbol Value Units Input Supply Voltage VCC 7 V PROG Voltage VPROG VCC+0.3 V BAT Voltage VBAT 7 V CHRG Voltage VCHRG 7 V BAT Short-Circuit Duration — Continuous — Thermal Resistance, Junction-to-Ambient ΘJA 250(SOT23-6L) °C/W 75(SOP-8 with Exposed PAD) BAT Pin Current IBAT 800 mA PROG Pin Current IPROG 800 A Maximum Junction Temperature TJ 125 °C Storage Temperature TS -65 to +125 °C Lead Temperature (Soldering, 10 sec) — 300 °C Package Part Number Marking Marking Information SOT23-6L EC49017NNB3R 017b 1.Starting with character 7, a bar on top of 7 is for production year 20 13, and underlined 7 is for year 2014. The naming pattern continues with consecutive characters for later years. 2. The last character b is the week code. (A-Z: 1-26, a-z: 27-52) SOP-8 (Exposed PAD) EC49017NNMHR 49017 LLLLL YYWWT 1. LLLLL：Lot No. 2. YYWW：date Code 3. T：Internal Tracking Code
Standalone Linear Lithium Battery Charger EC49017 Operating Rating(2) Parameter Symbol Value Units Supply Input Voltage VIN -0.3 to +7 V Junction Temperature TJ -40 to +85 °C
Electrical Characteristics
VIN = 5V; TJ = 25°C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VCC Input Supply Voltage 3.5 — 6 V ICC Input Supply Current Charge Mode(3), RPROG = 10k — 110 500 µA Standby Mode (Charge Terminated) — 70 — µA Shutdown Mode(RPROG Not Connected, VCC < VBAT, or VCC < VUV) — 20 40 µA VFLOAT Regulated Output (Float) Voltage IBAT = 30mA, ICHRG = 5mA 4.15 4.22 4.3 V IBAT BAT Pin Current RPROG = 10k, Current Mode 90 106 130 mA RPROG = 2k, Current Mode — 530 — mA Standby Mode, VBAT = 4.2V 0 +/-1 +/-5 µA Shutdown Mode (RPROG Not Connected) — +/-0.5 +/-5 µA Sleep Mode, VCC = 0V — +/-1 +/-5 µA ITRIKL Trickle Charge Current VBAT < VTRIKL, RPROG = 10k — 10 — mA VTRIKL Trickle Charge Threshold Voltage RPROG = 10k, VBAT Rising 2.8 2.9 3.0 V VUV VCC Undervoltage Lockout Threshold From VCC Low to High — 3.4 — V VUVHYS VCC Undervoltage Lockout Hysteresis — 100 — mV VMSD Manual Shutdown Threshold Voltage PROG Pin Rising — 1.25 — V PROG Pin Falling — 1.2 — V VASD VCC – VBAT Lockout Threshold Voltage VCC from Low to High — 100 — mV VCC from High to Low — 30 — mV ITERM C/10 Termination Current Threshold RPROG = 10k(4) — 10.5 — mA RPROG = 2k — 52 — mA
Standalone Linear Lithium Battery Charger EC49017 VIN = 5V; TJ = 25°C; unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VPROG PROG Pin Voltage RPROG = 10k, Current Mode 0.9 1.03 1.1 V VCHRG CHRG Pin Output Low Voltage ICHRG = 5mA — 0.6 — V Δ VRECHRG Recharge Battery Threshold Voltage VFLOAT - VRECHRG — 100 — mV TLIM Thermal Protection Temperature — 120 — °C tSS Soft-Start Time IBAT = 0 to 1000V/RPROG — 100 — µs tRECHARGE Recharge Comparator Filter Time VBAT High to Low — 1 — ms tTERM Termination Comparator Filter Time IBAT Falling Below ICHG/10 — 1000 — µs 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: ITERM 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 With 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 CHRGT Open-Drain Charge Termination Status Output. When the battery is charging, the CHRGT pin is pulled high by an external compenent such as an LED. After the charging is completed, this pin is pulled low by internal N-channel MOSFET and it can be used as a charging termination indicator.
Standalone Linear Lithium Battery Charger EC49017 Block Diagram
Standalone Linear Lithium Battery Charger EC49017 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) VBAT (V) RPROG=10k TA=25℃ Charge Current vs Supply Voltage 100 200 300 400 500 600 VCC (V) IBAT (mA) RPROG=2k RPROG=10k VBAT=4V TA=25℃ ONSET OF THERMAL REGULATION Trickle Charge Current vs Supply Voltage VCC (V) ITRIKL (mA) RPROG=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 (℃) VFLOAT (V) Typical Performance Characteristics
Standalone Linear Lithium Battery Charger EC49017 Operation The EC49017 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 ±1%. The EC49017 includes an internal P -channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resist or is required; thus, the basic charger circuit requires only two external comp onents. Furthermore, the EC49017 is capable of operating from a USB power source. 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 EC4901 7 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 (4.2 2V), the EC4901 7 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 1060 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 1060,1060 The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage using the following equation: 1060 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 EC49017 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 p in 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 re sult in premature charge cycle termination. Once the average charge current drops below 1/10th the programmed value, the EC49017 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 EC49017 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the 4.05V recharge threshold (VRECHRG), another charge cycle begins and current is once again supplied to the battery. To manually restart a charge cycle when in standby mode, the
Standalone Linear Lithium Battery Charger EC49017 Stability Considerations The constant-voltage mode feedback loop is stable without an output capacitor provided a ba ttery 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 1Ω resistor in series with the capacitor. No serie s 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 multi layer ceramic capacitors. Because of the self-resonant and high Q characteristics of some types of ceramic capacitors, high voltage transients can b e generated under some start -up conditions, such as connecting the charger input to a live power source. Adding a 1.5Ω resistor in series with a ceramic capacitor will minimize start-up voltage transients. Power Dissipation The conditions that cause the EC49017 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 = (VCC – VBAT) • IBAT The approximate ambient temperature at which the thermal feedback begins to protect the IC is: TA = 120°C – PDθJA TA = 120°C – (VCC – VBAT) • IBAT • 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 gene rated 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 EC49017 No-load indications Put a 1uF capacitor between BAT and GND . This makes up of a No -load indications circuit as shown below. If there is not a battery connected to BAT and GND of EC49017 then we can see that LED-R will be flashing at 2.5 Hz/S. If there is a battery connected to BAT and GND Pin of EC49017. Then EC49017 enters normal charging cycle.
Standalone Linear Lithium Battery Charger EC49017 OUTLINE DRAWING SOT23-6L OUTLINE DRAWING SOP-8(Exposed PAD)