EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger General Description The EC49020 is a 4.5-20V input, 2A single-cell synchronous Li-Ion battery switching charger, suitable for portable application. The EC49020 integrates a synchronous PWM controller, 20V rating power MOSFETs, current sense resistor, high-accuracy current and voltage regulation, and charge termination, into a compact 8-pin SOP(Expose PAD) package. Features ◆ 1.5MHz Synchronous Switching Charger with Integrated Power FETs ◆ Up to 93% Efficiency ◆ 20V Input Rating with 6.7V OVP ◆ Programmable (2A Max) Charge Current ◆ Built-in Charge Current Soft Start ◆ Built-in Reverse Current Blocking Diode ◆ Built-in Charge Current Sense Resistor ◆ Output Short Circuit Protection ◆ Over Temperature Protection ◆ Available in a SOP8(Expose PAD) Package Applications ◆ Tablet PC, Ebook and Netbook ◆ Handheld Portable Media Products ◆ Power Bank Ordering Information EC49020 XX XX X R : Tape Reel T :Tube XS : VBAT_REG=4.2V BS : VBAT_REG=4.35V MH：SOP 8L (Exposed Pad) Part No. EC49020XSMHR EC49020XSMHT EC49020BSMHR EC49020BSMHT E-CMOS Corp. (www.ecmos.com.tw) Marking Temp. Range -40°C ~85°C YYWWX SOP 8L (Exposed PAD) 2. YYWW：Date code 3. X：VBAT_REG=4.2V 1. LLLLL：LOT NO. 49020 LLLLL Remark 1. LLLLL：LOT NO. 49020 LLLLL Package -40°C ~85°C YYWWB Page 1 of 11 SOP 8L 2. YYWW：Date code (Exposed PAD) 3. B：VBAT_REG=4.35V 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Pin Configuration Pin Description Pin NO. Pin Name 1 VCC 5V linear regulator output. Bypass a 2.2uF ceramic capacitor from V CC to GND. 2 BAT Battery connection. Connect to the positive terminal of the battery. Bypass BAT to GND with a 20uF capacitor. 3 BS High Side MOSFET Gate Driver Supply. Connect a 0.1uF ceramic capacitor from BS to SW to supply the gate drive for the high side MOSFETs. 4 SW Switching node. Connect SW to the external inductor. 5 VIN IC power supply of internal bias and power devices. Bypass 20uF MLCC ceramic capacitor from VIN to GND. 6 TS Battery Pack NTC Monitor. Connect TS to the center tap of a resistor divider from V CC to GND. Pull TS to GND and disable charge function. 7 ISET Charge Current Programming Input. Connect a resistor R ISET from ISET to GND to program the charge current. The charge current is programmable from 0.5A to 2A. 8 EP STAT GND Description Charge Status Open Drain Output. STAT is pulled low when a charge cycle starts and remains low while charging. STAT is high impedance when the charging terminates and when no supply exists. STAT is blinking when IC detect fault conditions. HIGH LOW Blinking Charge complete Charge in progress Fault The exposed thermal pad and the IC ground pin. E-CMOS Corp. (www.ecmos.com.tw) Page 2 of 11 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Typical Operating Circuit EC49020 Electrical Characteristics Absolute Maximum Ratings (1) VIN, STAT to GND .…….…………….…-0.3V~20V Junction temperature range, TJ ………………-40°C ~155°C BS to GND…..…………………..……… -0.3V~26V Storage temperature range, Tstg ……………. -55°C ~155°C SW to GND.……………………….…… Lead Temperature…………………..…..………260°C -2~20V VCC, ISET, TS, BAT to GND …..……… -0.3V~6V Thermal information Maximum Power Dissipation(T A=+25°C )…………2.4W Thermal resistance(θJA) .…………………..41.3°C/W Recommend Operating Conditions (2) Input Voltage (VIN) ………………..… +4.5V to +6.5V Ambient Temperature Range ..………. -40°C to +85°C Note (1): Stress beyond those listed under “Absolute Maximum Ratings” may damage the device. Note (2): The device is not guaranteed to function outside the recommended operating conditions. E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 11 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Electrical Characteristics VIN=5V, typical values are at T A = +25°C, with respect to GND PARAMETER TEST CONDITIONS INPUT VOLTAGE MIN VIN 4.5 Supply Operating Range VUVLO Under-voltage lockout threshold VUVLO_HYS Hysteresis on UVLO VOVP Over-Voltage Rising VOVP_HYS Hysteresis on OVP TYP MAX UNITS 6.5 V Measure on VIN 0V4V 3.3 V Measure on VIN 4V 0V 300 mV VIN rising 5V 7V 6.55 VIN falling 7V 5V 6.75 6.95 V 100 mV VIN – VBAT falling 100 mV VIN – VBAT rising 200 mV AUTOMATIC SLEEP COMPARATOR (REVERSE DISCHARGING PROTECTION) VSLEEP SLEEP mode threshold VSLEEP_HYS Hysteresis QUIESCENT CURRENTS IBAT Battery discharge current IAC Adapter supply current Pull TS to GND VIN > VUVLO, VIN > VBAT, VBAT>VBAT_REG, Charge disabled 25 µA 1.2 2.0 mA 4.200 4.242 CHARGE VOLTAGE REGULATION VBAT_REG BAT regulation voltage EC49020XS, measured on BAT 0°C ≤ TA ≤+70°C 4.158 EC49020BS, measured on BAT 0°C ≤ TA ≤+70°C 4.306 V 4.350 4.393 VRCHG Recharge Threshold, belowregulation voltage limit 1 cell, measured on BAT VBAT_REG-VBAT 100 mV VLOWV Trickle Charge to fast charge transition threshold measured on BAT 2.9 V As percentage of VBAT_REG 104% VOV_BAT BAT Over-voltage Threshold CHARGE CURRENT REGULATION VBAT(REG) > VBAT > VLOWV; IOUT = KISET /RISET；RISET = 40kΩ to 200kΩ IOUT Charge Current Limit KISET Fast charge current factor RISET = KISET /IOUT; 0.5A<IOUT< 2A 100 A·kΩ Trickle Charge Current VBAT < VLOWV 10 %IOUT VBAT > VRCHG 10 %IOUT Charger suspends charge. As percentage to VCC 70.5% 73.5% 76.5% As percentage to VCC 0.4% As percentage to VCC 47% 41.7% 44.7% 47.7% %TRICHG %TERM Termination Current 0.5 2 A THERMISTOR COMPARATOR VLTF Cold Temperature Threshold, TS pin Voltage Rising Threshold VLTF_HYS Cold Temperature Hysteresis, TS pin voltage Falling VHTF Hot Temperature TS pin voltage rising Threshold VTCO Cut-off Temperature TS pin Voltage falling Threshold As percentage to VCC VOFF Charging Disable Threshold TS pin voltage falling edge Hysteresis 0.15V 0.15 V INTERNAL THERMAL REGULATION TJ_REG Temperature Regulation Limit E-CMOS Corp. (www.ecmos.com.tw) Charging Page 4 of 11 125 4D25N-Rev.P001 °C EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger TJ(OFF) Thermal Shutdown Temperature 160 °C TJ(OFF-HYS) 20 °C Thermal Shutdown Hysteresis INTERNAL PWM Driver fsw PWM Switching Frequency IOCP_HSFET Peak Current limit RDS_HI RDS_LO VCC REGULATOR VCC_REG VCC regulator voltage IVCC_LIM VCC current limit 1200 1500 4 150 75 1700 kHz A mΩ mΩ 4.0 5 50 5.5 V mA Measure on High Side FET High Side MOSFET On Resistance Low Side MOSFET On Resistance VIN > 6 V, VCC = 0 V Functional Block Diagram E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 11 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Typical Performance Characteristics VIN = 5V, RISET=50kΩ, Typical Application Circuit Figure 1, T A = +25°C , unless otherwise noted E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 11 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Typical Application Circuit EC49020 Figure 1. EC49020 ICHG=2A Typical Application Circuit E-CMOS Corp. (www.ecmos.com.tw) Page 7 of 11 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Detailed Description The EC49020 family is an integrated charger optimized for charging 1-cell Li-ion or Li-polymer batteries. It charges a battery with constant current (CC) and constant voltage (CV) profile. The typical charge profile is illustrated in Figure 2. Figure 2. EC49020 Typical Charge Profile Battery Charge Current Regulation The charge current up to 2A is programmed by a resistor RISET from ISET to ground. The charge current is calculated by the following equation: The valid resistor range is 40kΩ to 200kΩ (See Table 1.) Under high ambient temperature, the charge current will be fold back to keep IC junction temperature not exceeding +125°C. Table 1. Charge Current Settings E-CMOS Corp. (www.ecmos.com.tw) RISET (kΩ) Charge Current (A) 50 2.0 66.7 1.5 100 1.0 200 0.5 Page 8 of 11 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Battery Trickle Charge Current Regulation During power-up, if the battery voltage is below the VLOWV threshold, the EC49020 only applies the trickle charge current into the battery. This trickle charge feature is intended to revive deeply discharged cells. If the VLOWV threshold is not reached within 30 minutes of initiating trickle charge, the charger is turned off, and STAT pin blinks to indicate a FAULT condition. For EC49020 series, the trickle charge current is set as 10% of the full charge current. Charge Termination The EC49020 monitor the charge current during the battery voltage regulation phase. Charge termination is set when the battery voltage is higher than recharge threshold VRCH and the charge current is less than 10% of the full charge current. Recharge A new charge cycle is initiated when one of the following conditions occurs: The battery voltage falls below the recharge threshold Input supply VIN power-on-reset (POR) event occurs TS pin is toggled below 0.15V (disable charging) and above 0.3V (enable charging). Charge Current Soft Start The EC49020 soft starts the charge current to ensure no overshoot or stress on the output capacitors or the power converter. The Thermistor Input TS The EC49020 continuously monitors battery temperature by measuring the voltage between the TS pin and GND. A negative temperature coefficient thermistor (NTC) and an external voltage divider typically develop this voltage. The EC49020 compares this voltage against its internal thresholds to determine if charging is allowed. To initiate a charge cycle, the battery temperature must be within the VLTF to VHTF thresholds. If battery temperature is outside of this range, the EC49020 suspends charge and waits until the battery temperature is within the V LTF to VHTF range. During the charge cycle the battery temperature must be within the VLTF to VTCO threshold. Figure 3. Thermistor Input TS Pin Threshold E-CMOS Corp. (www.ecmos.com.tw) Page 9 of 11 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Refer to EC49020 typical operating circuit. RTHHOT is the expected thermistor resistance at the programmed hot threshold, and RTHCOLD is the expected thermistor resistance at the programmed cold threshold. The values of R3 and R4 can be determined by using below equations. Where: VLTF = 0.735 X VCC VTCO = 0.447 X VCC PCB Layout Consideration For the best efficiency and minimum noise problem, Place CIN, C6, C7, C2, L, RISET, R3 and R4 close to the IC. Maximize the PCB copper area connecting to GND pin to achieve the best thermal and noise performance. If the board space allowed, a ground plane is highly desirable. CIN must be close to Pins IN and GND. The loop area formed by CIN and GND must be minimized. The PCB copper area associated with SW pin must be minimized to avoid the potential noise problem. E-CMOS Corp. (www.ecmos.com.tw) Page 10 of 11 4D25N-Rev.P001 EC49020 High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Packaging Information EC49020 SOP 8L 150mils(EP) PACKAGE OUTLINE DIMENSONS E-CMOS Corp. (www.ecmos.com.tw) Page 11 of 11 4D25N-Rev.P001