EC49020 E-CMOS | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 11
Technical content
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
XS : VBAT_REG=4.2V BS : VBAT_REG=4.35V R : Tape Reel T :Tube MH：SOP 8L (Exposed Pad)
High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Pin Configuration Pin Description Pin NO. Pin Name Description 1 VCC 5V linear regulator output. Bypass a 2.2uF ceramic capacitor from VCC 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 RISET from ISET to GND to program the charge current. The charge current is programmable from 0.5A to 2A.
8 STAT
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 EP GND The exposed thermal pad and the IC ground pin.
High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Typical Operating Circuit
Electrical Characteristics
Absolute Maximum Ratings (1) VIN, STAT to GND .…….…………….…-0.3V~20V Junction temperature range, TJ ………………-40°C ~155°C VCC, ISET, TS, BAT to GND …..……… -0.3V~6V Thermal information Recommend Operating Conditions (2) 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. EC49020
High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger VIN=5V, typical values are at TA = +25°C, with respect to GND PARAMETER TEST CONDITIONS MIN TYP MAX UNITS INPUT VOLTAGE VIN Supply Operating Range 4.5 6.5 V VUVLO Under-voltage lockout threshold Measure on VIN 0V4V 3.3 V VUVLO_HYS Hysteresis on UVLO Measure on VIN 4V 0V 300 mV VOVP Over-Voltage Rising VIN rising 5V 7V 6.55 6.75 6.95 V VOVP_HYS Hysteresis on OVP VIN falling 7V 5V 100 mV AUTOMATIC SLEEP COMPARATOR (REVERSE DISCHARGING PROTECTION) VSLEEP SLEEP mode threshold VIN – VBAT falling 100 mV VSLEEP_HYS Hysteresis VIN – VBAT rising 200 mV QUIESCENT CURRENTS IBAT Battery discharge current Pull TS to GND 25 µA IAC Adapter supply current VIN > VUVLO, VIN > VBAT, 1.2 2.0 mA VBAT>VBAT_REG, Charge disabled CHARGE VOLTAGE REGULATION VBAT_REG BAT regulation voltage EC49020XS, measured on BAT 0°C ≤ TA ≤+70°C 4.158 4.200 4.242 V EC49020BS, measured on BAT 0°C ≤ TA ≤+70°C 4.306 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 VOV_BAT BAT Over-voltage Threshold As percentage of VBAT_REG 104% CHARGE CURRENT REGULATION IOUT Charge Current Limit VBAT(REG) > VBAT > VLOWV; IOUT = KISET /RISET；RISET = 40kΩ to 200kΩ 0.5 2 A KISET Fast charge current factor RISET = KISET /IOUT; 0.5A<IOUT< 2A 100 A· kΩ %TRICHG Trickle Charge Current VBAT < VLOWV 10 %IOUT %TERM Termination Current VBAT > VRCHG 10 %IOUT THERMISTOR COMPARATOR VLTF Cold Temperature Threshold, TS pin Voltage Rising Threshold Charger suspends charge. As percentage to VCC 70.5% 73.5% 76.5% VLTF_HYS Cold Temperature Hysteresis, TS pin voltage Falling As percentage to VCC 0.4% VHTF Hot Temperature TS pin voltage rising Threshold As percentage to VCC 47% VTCO Cut-off Temperature TS pin Voltage falling Threshold As percentage to VCC 41.7% 44.7% 47.7% VOFF Charging Disable Threshold TS pin voltage falling edge Hysteresis 0.15V 0.15 V INTERNAL THERMAL REGULATION TJ_REG Temperature Regulation Limit Charging 125 °C
High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger TJ(OFF) Thermal Shutdown Temperature 160 °C TJ(OFF-HYS) Thermal Shutdown Hysteresis 20 °C INTERNAL PWM Driver fsw PWM Switching Frequency 1200 1500 1700 kHz IOCP_HSFET Peak Current limit Measure on High Side FET 4 A RDS_HI High Side MOSFET On Resistance 150 mΩ RDS_LO Low Side MOSFET On Resistance 75 mΩ VCC REGULATOR VCC_REG VCC regulator voltage VIN > 6 V, 4.0 5 5.5 V IVCC_LIM VCC current limit VCC = 0 V 50 mA Functional Block Diagram
High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Typical Performance Characteristics VIN = 5V, RISET=50kΩ, Typical Application Circuit Figure 1, TA = +25°C , unless otherwise noted
Figure 1. EC49020 ICHG=2A Typical Application Circuit
Figure 2. EC49020 Typical Charge Profile fold back to keep IC junction temperature not exceeding +125°C. Table 1. Charge Current Settings
indicate a FAULT condition. For EC49020 series, the trickle charge current is set as 10% of the full charge current. toggled below 0.15V (disable charging) and above 0.3V (enable charging). this range, the EC49020 suspends charge and waits until the battery temperature is within the VLTF 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
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.
High Efficiency 2A 1.5MHz Single Cell Li-ion Battery Switching Charger Packaging Information EC49020 SOP 8L 150mils(EP) PACKAGE OUTLINE DIMENSONS