EC9529A E-CMOS | Alldatasheet

Document overview

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Technical content

Features

  • Protection of Charger Reverse Connection
  • Protection of Battery Cell Reverse Connection
  • Integrates Advanced Power MOSFET
  • Ultra- compact SOT23-5 Package
  • Only One External Capacitor Required
  • Over-temperature Protection
  • Overcharge Current Protection
  • Two-step Overcurrent Detection: -- Over- discharge Current -- Load Short- Circuiting
  • Charger Detection Function
  • 0V Battery Charging Function
  • Delay Times are generated inside
  • High-accuracy Voltage Detection
  • Low Current Consumption - Operation Mode: 2.8µA typ. - Power- down Mode:1.5µA typ.
  • RoHS Compliant and Lead (Pb) Free

Applications

  • One-Cell Lithium-ion Battery Pack
  • Lithium-Polymer Battery Pack

EC9529A Lithium Battery Protection Integrated Circuit Pin Assignments Pin Description

Ordering Information

Note: “YWW” is manufacturing codes, “Y” stands for year=>2015=5 “WW” means the week PIN NUMBER PIN NAME PIN DESCRIPTION

1 VT Test Pin；only for Just- link usage when FT, no function when application

2 GND Ground Pin, connect the negative terminal of the battery to this pin

3 VDD Power Supply Pin

4,5 VM The Cathode terminal of the battery or charger, through internal MOSFET To the Ground PART NUMBER Package Type Over-charge Detection Voltage [VCU] (V) Over-charge Release Voltage [VCL] (V) Over-discharge Detection Voltage [VDL] (V) Over-discharge Release Voltage [VDR] (V)) Over-current Detection Current [IOV1] (A Top Mark EC9529ANB2R SOT23-5 4.30 4.10 2.40 3.0 3 03TYWW

EC9529A Lithium Battery Protection Integrated Circuit Absolute Maximum Ratings (Note: Do not exceed limits to prevent damage to the device. Exposure to absolute maximum rating conditions for periods may affect device reliability.)

Electrical Characteristics

Typical and limits appearing in normal type apply for TA=25, unless otherwise specified PARAMETER VALUE UNIT VDD input pin voltage -0.3~6 V VM input pin voltage -6~10 V Operating Ambient Temperature -40~+85 ℃ Maximum Junction Temperature 125 ℃ Storage Temperature -55-150 ℃ Lead Temperature ( Soldering, 10 sec) 300 ℃ Power Dissipation at T=25°C 0.4 W Package Thermal Resistance (Junction to Ambient) θJA 250 ℃/W Package Thermal Resistance (Junction to Case) θJC 130 ℃/W Anti- ESD (HBM) 2000 V Parameter Symbol Test Condition Min Typ Max Unit Detection Voltage Overcharge Detection Voltage VCU -- 4.25 4.3 4.35 V Overcharge Release Voltage VCL -- 4.05 4.1 4.15 V Over-discharge Detection Voltage VDL -- 2.3 2.4 2.5 V Over-discharge Release Voltage VDR -- 2.9 3.0 3.1 V Charger Detection Voltage VCHA -- -0.12 V Detection Current Over-discharge Current Detection IIOV 1 Vdd=3.5V 3 A Load Short-Circuiting Detection ISHORT Vdd=3.5V 12 A Current Consumption Current Consumption in Normal Operation IOPE Vdd=3.5V, VM=0V 2.8 6 uA Current Consumption in Power Down IPDN Vdd=2V, VM Pin floating 1.5 uA FET on Resistance Equivalent FET on Resistance RDS Vdd=3.6V，IVM=1A 45 mΩ

EC9529A Lithium Battery Protection Integrated Circuit Parameter Symbol Test Conditio n Min Typ Max Unit Over Temperature Protection Over Temperature Protection 120 ℃ Over Temperature Recovery Degree 100 ℃ Detection Delay Time Over-charge Voltage Detection Delay Time TCU VDD=3.6V~4.4V 128 ms Over-discharge Voltage Detection Delay Time TDL VDD=3.6V~2.0V 32 ms Over-discharge Current Detection Delay Time TIOV 1 VDD=3.6V 8 ms Load Short-Circuiting Detection Delay Time TSHORT VDD=3.6V 32 us

EC9529A Lithium Battery Protection Integrated Circuit FUNCTIONAL DESCRIPTION The EC9529A monitors the voltage and current of a battery and protects it from being damaged due to over - charge voltage, over- discharge voltage, over - discharge current, and short circuit conditions by disconnecting the battery from the load or charger. These functions are required in order to operate the battery cell within specified limits. The device requires only one external capacitor. The MOSFET is in tegrated and its RDS(ON) ） is as low as 45mΩ typical Normal operating Mode If no exception condition is detected, charging and discharging can be carried out freely. This condition is called the normal operating mode. Overcharge Condition When the battery voltage becomes higher than the overcharge detection voltage (VCU) during charging under normal condition and the state continues for the overcharge detection de lay time (tCU) or longer, the EC9529A turns the charging control FET off to stop charging. This condition is called the overcharge condition. The overcharge condition is released in the following two cases: 1. When the battery voltage drops below the overcharge rel ease voltage (VCL), the EC9529A turns the charging control FET on and returns to the normal condition. 2. When a load is connected and discharging starts, the EC9529A turns the charging control FET on and returns to the normal condition. The release mechanism is as follow s: the discharging current flows through an internal parasitic diode of the charging FET immediately after a load is connected and discharging starts, and the VM pin voltage increases about 0.7 V (forward voltage of the diode) from the GND pin voltage momentarily. The EC9529A detects this voltage and releases the overcharge condition. Consequently, in the case that the battery voltage is equal to or lower than the overcharge detection voltage (VCU), the EC9529A returns to t he normal condition immediately, but in the case the battery voltage is higher than the overcharge detection voltage (VCU),the chip does not return to the normal condition until the battery voltage drops below the overcharge detection voltage (VCU) even if the load is connected. In addition, if the VM pin voltage is equal to or lower than the overcurrent 1 detection voltage when a load is connected and discharging starts, the chip does not return to the normal condition. Remark: If the battery is charg ed to a voltage higher than the overcharge detection voltage (VCU) and the battery voltage does not drops below the overcharge detection voltage (VCU) even when a heavy load, which causes an overcurrent, is connected, the overcurrent 1 and overcurrent 2 do not work until the battery voltage drops below the overcharge detection voltage (VCU). Since an actual battery has, however, an internal impedance of several dozens of mΩ, and the battery voltage drops immediately after a heavy load which causes an overcurrent is connected, the overcurrent 1 and overcurrent 2 work. Detection of load short-circuiting works regardless of the battery voltage. Over- discharge Condition When the battery voltage drops below the over -discharge detection voltage (VDL) during discharging under normal condition and it continues for the over -discharge detection delay time (tDL) or longer, the EC9529A turns the discharging control FET off and stops discharging. This condition is called over - discharge condition. After the discharging control FET is turned off, the VM pin is pulled up by the RVMD resistor between VM and VDD in EC9529A. Meanwhile when VM is bigger than 1.5 V (typ.) (the load short- circuiting detection voltage), the current of the chip is reduced to the power-down current (IPDN). This condition is called power -down condition. The VM and VDD pins are shorted by the RVMD resistor in the IC under the over -discharge and power -down conditions. The power -down condition is released when a charger is connected and the potential difference between VM and VDD becomes 1.3 V (typ.) or higher (load short-circuiting detection voltage). At this time, the MOSFET is still off. When the battery voltage becomes the over-discharge detection voltage (VDL) o r higher (see note), the EC9529A turns MOSFET on and changes to the normal condition from the over-discharge condition. Remark: If the VM pin voltage is no less than the charger detection voltage (VCHA), when the battery under over-discharge condition is connected to a charger, the over -discharge condition is released (the discharging control FET is turned on) as usual, provided that the battery voltage reaches the over -discharge release voltage (VDU) or higher.

EC9529A Lithium Battery Protection Integrated Circuit Overcurrent Condition When the discharging current becomes equal to or higher than a specified value (the VM pin voltage is equal to or higher than the overcurrent detection voltage) during discharging under normal condition and the state continues for the overcurrent detection del ay time or longer, the EC9529A turns off the discharging control FET to stop discharging. This condition is called overcurrent condition. (The overcurrent includes overcurrent, or load short-circuiting.) The VM and GND pins are shorted internally by the RVMS resistor under the overcurrent con dition. When a load is connected, the VM pin voltage equals the VDD voltage due to the load. The overcurrent condition returns to the normal condition when the load is released and the impedance between the B+ and B - pins becomes higher than the automatic recoverable impedance. When the load is removed, the VM pin goes back to the GND potential since the VM pin is shorted the GND pin with the RVMS resistor. Detecting that the VM pin potential is lower than the overcurrent detection v oltage (VIOV1), the IC returns to the normal condition. Abnormal Charge Current Detection If the VM pin voltage drops below the charger detection voltage (VCHA) during charging under the normal condition and it continues for the overcharge detection delay tim e (tCU) or longer, the EC9529A turns the charging control FET off and stops charging. This action is called abnormal charge current detection. Abnormal charge current detection works when the discharging control FET is on and the VM pin voltage drops below the charger detection voltage (VCHA). When an abnormal charge current flows into a battery in the over -discharge condition, the EC9529A consequently turns the charging control FET off and stop s charging after the battery voltage becomes the over -discharge detection voltage and the overcharge detection delay time (tCU) elapses. Abnormal charge current detection is released when the voltage difference between VM pin and GND pin becomes lower than the charger detection voltage (VCHA) by separating the charger. Since the 0 V battery charging function has higher priority than the abnormal charge current detection function, abnormal charge current may not be detected by the product with the 0 V b attery charging function while the battery voltage is low. Load Short-circuiting condition If voltage of VM pin is equal or below short circuiting protection vol tage (VSHORT), the EC9529A will stop discharging and battery is disconnected from load. The ma ximum delay time to switch current off is tSHORT. This status is released when voltage of VM pin is higher than short protection voltage (VSHORT), such as when disconnecting the load. 0V Battery Charging Function This function enables the charging of a co nnected battery whose voltage is 0 V by self -discharge. When a charger having 0 V battery start charging charger voltage (V0CHA) or higher is connected between B+ and B - pins, the charging control FET gate is fixed to VDD potential. When the volta ge between the gate and the source of the charging control FET becomes equal to or higher than the turn -on voltage by the charger voltage, the charging control FET is turned on to start charging. At this time, the discharging control FET is off and the charging current flows through the internal parasitic diode in the discharging control FET. If the battery voltage becomes equal to or higher than the over -discharge release voltage (VDU), the normal condition returns. Note: (1) Some battery providers do not recommend charging of completely discharged batteri es. Please refer to battery providers before the selection of 0 V battery charging function. (2) The 0V battery charging function has higher priority than the abnormal charge current detection function. Consequently, a product with the 0 V battery charging function charges a battery and abnormal charge current cannot be detected during the battery voltage is low (at most 1.8 V or lower). (3) When a battery is connected to the IC for the first time, the IC may not enter th e normal condition in which discharging is possible. In this case, set the VM pin voltage equal to th e GND voltage (short the VM and GND pins or connect a charger) to enter the normal condition.

EC9529A Lithium Battery Protection Integrated Circuit TIMING CHART 1． Over- charge and over-discharge Voltage Detection: 2． Over-discharge Current Detection: Remark: (1) Normal condition (2) Over- charge Voltage condition (3) Over-discharge Voltage condition (4) Over Current condition

EC9529A Lithium Battery Protection Integrated Circuit 3． Charger Detection: 4． Abnormal Charging Current Detection: Remark: (1) Normal condition (2) Over-charge Voltage condition (3) Over-discharge Voltage condition (4) Over Current condition

EC9529A Lithium Battery Protection Integrated Circuit TYPICAL APPLICATION SUGGESTION: As shown in Figure below, the bold line is high density current path which must be kept as SHORT as possible. For thermal management, ensure that these trace WIDTH is adequate. C1 is a decoupling capacitor, which should be placed as CLOSE as possible to EC9529A. Precautions

  • Pay attention to the operating conditions for input/outpu t voltage and load curren t so that the power loss in EC9529A does not over- load the power dissipation of the package.
  • Do not apply an Electro - static Discharge to this EC9529A that exceeds the performance ratings of the built - in electrostatic protection circuit.

EC9529A Lithium Battery Protection Integrated Circuit

Package Information

SOT23-5 PACKAGE OUTLINE AND DIMENSIONS Symbol Dimensions In Milimeters Dimensions In Inches Min Max Min Max A 1.050 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e 0.950 TYP 0.037 TYP e1 2.695 3.050 0.106 0.120 L 0.700 REF 0.028 REF L1 0.400 0.800 0.016 0.031 θ 0° 8° 0° 8°