SD5350A SHOUDING | Alldatasheet

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2EEV0. Shouding SD5350A SD5350A SD5350A DS 5350 SD 5350A - 1 - One Cell Lithium-ion/Polymer Battery Protection IC GENERAL DESCRIPTION The A product is a high integration solution for lithium- ion/polymer battery protection. contains advanced power MOSFET, high-accuracy voltage detection circuits and delay circuits. is put into an ultra-small SOT23-5 package and only one external component makes it an ideal solution in limited space of battery pack. has all the protection functions required in the battery application including overcharging, overdischarging, overcurrent and load short circuiting protection etc. The accurate overcharging detection voltage ensures safe and full utilization charging. The low standby current drains little current from the cell while in storage. The device is not only targeted for digital cellular phones, but also for any other Li-Ion and Li-Poly battery-powered information appliances requiring long- term battery life.

FEATURES

Protection of Charger Reverse Connection Protection of Battery Cell Reverse Connection Integrate Advanced Power MOSFET with Equivalent of 54m Ω RDS(ON) Ultra-small SOT23-5 Package Only One External Capacitor Required Over-temperature Protection Overcharge Current Protection Two-step Overcurrent Detection: -Overdischarge 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: 2.8 μ A typ. Power-down Mode: 1.5 μ A typ. RoHS Compliant and Lead (Pb) Free

APPLICATIONS

One-Cell Lithium-ion Battery Pack Lithium-Polymer Battery Pack Figure 1. Typical Application Circuit

  • 2 -

ORDERING INFORMATION

[VCU] (V) Overcharge Release Voltage [VCL] (V) Overdischarge Detection Voltage [VDL] (V) Overdischarge Release Voltage [VDR] (V) Overcurrent Detection Current [IOV1] (A) Top Mark 5350A SOT 23-5 4.30 4.10 2.40 3.0 3 PIN CONFIGURATION Figure 2. PIN Configuration

1 V T Test pin；only for vendor not used by application

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

3 VDD Power Supply

  • 3 - Maximum Junction Temperature 125 °C Storage Temperature -55 to 150 °C Lead Temperature ( Soldering, 10 sec) 300 °C Power Dissipation at T=25°C 0.4 W Package Thermal Resistance (Junction to Ambient) θ JA 250 °C/W Package Thermal Resistance (Junction to Case) θ JC 130 °C/W ESD 2000 V

ELECTRICAL CHARACTERISTICS

Typicals and limits appearing in normal type apply for T A = 25 o C, unless otherwise specified Parameter Symbol Test Condition Min Typ Max Unit Detection Voltage Overcharge Detection Voltage VCU 4.25 4.30 4.35 V Overcharge Release Voltage VCL 4.05 4.10 4.15 V Overdischarge Detection Voltage VDL 2.3 2.4 2.5 V Overdischarge Release Voltage VDR 2.9 3.0 3.1 V Charger Detection Voltage VCHA -0.07 -0.12 -0.2 V Detection Current Overdischarge Current1 Detection IIOV1 VDD=3.5V 2.1 3 3.9 A Load Short-Circuiting Detection ISHORT VDD=3.5V 10 20 30 A Current Consumption Current Consumption in Normal Operation IOPE VDD=3.5V VM =0V 2.8 6 μ A Current Consumption in power Down IPDN VDD=2.0V VM pin floating 1.5 μ A VM Internal Resistance Internal Resistance between VM and VDD RVMD VDD=3.5V VM=1.0V 320 k Ω Internal Resistance between VM and GND RVMS VDD=2.0V VM=1.0V 100 k Ω FET on Resistance Equivalent FET on Resistance RDS(ON) VDD=3.6V IVM =1.0A 54 63 m Ω Over Temperature Protection Over Temperature Protection TSHD+ 120 Shouding SD 5350A www.shouding.net 2EEV0.

Figure 3. Functional Block Diagram

SD5350A. SD5350A SD5350 SD5350A SD5350A 0A SD535 SD5350A - 5 - than the overcharge detection voltage (VCU) during charging under normal condition and the state continues for the overcharge detection delay time (tCU) or longer, the 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 release voltage (VCL), the turns the charging control FET on and returns to the normal condition. 2, When a load is connected and discharging starts, the turns the charging control FET on and returns to the normal condition. The release mechanism is as follows: 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 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 returns to the 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 charged 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. Overdischarge Condition When the battery voltage drops below the overdischarge detection voltage (VDL) during discharging under normal condition and it continues for the overdischarge detection delay time (tDL) or longer, the turns the discharging control FET off and stops discharging. This condition is called overdischarge condition. After the discharging control FET is turned off, the VM pin is pulled up by the RVMD resistor between VM and VDD in 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 overdischarge 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 FET is still off. When the battery voltage becomes the overdischarge detection voltage (VDL) or higher (see note), the turns the FET on and changes to the normal condition from the overdischarge condition. Remark If the VM pin voltage is no less than the charger detection voltage (VCHA), when the battery under overdischarge condition is connected to a charger, the overdischarge condition is released (the discharging control FET is turned on) as usual, provided that the battery voltage reaches the overdischarge release voltage (VDU) or higher. Shouding SD 5350A www.shouding.net 2EEV0.

  • 6 - 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 delay time or longer, the 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 condition. 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 voltage (VIOV), 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 time (tCU) or longer, the 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 overdischarge condition, the consequently turns the charging control FET off and stops charging after the battery voltage becomes the overdischarge 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 battery charging function while the battery voltage is low. Load Short-circuiting condition If voltage of VM pin is equal or below short circuiting protection voltage (VSHORT), the will stop discharging and battery is disconnected from load. The maximum 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. Delay Circuits The detection delay time for overdischarge current 2 and load short-circuiting starts when overdischarge current 1 is detected. As soon as overdischarge current 2 or load short-circuiting is detected over detection delay time for overdischarge current 2 or load short- circuiting, the stops discharging. When battery voltage falls below overdischarge detection voltage due to overdischarge current, the stop discharging by overdischarge current detection. In this case the recovery of battery Shouding SD 5350A www.shouding.net 2EEV0.

Figure 4. Overcurrent delay time voltage (VDU), the normal condition returns. the battery voltage is low (at most 1.8 V or lower).

  • 8 - TIMING CHART 1． Overcharge and overdischarge detection VCU VCU-VHC Battery voltage VDL+VDH VDL ON DISCHARGE OFF ON CHARGE OFF VDD Vov1 VSS VCHA VM Charger connection Load connection tCU tCL Figure5-1 Overcharge and Overdischarge Voltage Detection 2． Overdischarge current detection VCU VCU-VHC VDL+VDH VDL Battery voltage ON DISCHARGE OFF VDD VSHORT Vov2 Vov1 VSS VM Charger connection Load connection tIOV1 tIOV2 tSHORT Figure5-2 Overdischarge Current Detection Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4) Overcurrent condition Shouding SD 5350A www.shouding.net 2EEV0.
  • 9 - 3． Charger Detection VCU VCU-VHC Battery voltage VDL+VDH VDL ON DISCHARGE OFF Charger connection Load connection VDD VSS VCHA VM (1) (1)(3) tDL Figure5-3 Charger Detection 4． Abnormal Charger Detection VCU VCU-VHC Battery voltage VDL+VDH VDL ON DISCHARGE OFF ON CHARGE OFF VDD VSS VCHA VM Charger connection Load connection tDL tCU Figure5-4 Abnormal Charger Detection Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4) Overcurrent condition Shouding SD 5350A www.shouding.net 2EEV0.

SD5350A. Test based on SD 5350 - 10 - TYPICAL CHARACTERISTICS ( A version, VBAT = 3.6V, TA= 25C unless otherwise specified) Internal FET On-Resistance vs. Junction Temperature TYPICAL APPLICATION As shown in Figure 6, the bold line is the high density current path which must be kept as short as possible. For thermal management, ensure that these trace widths are adequate. C1 is a decoupling capacitor which should be placed as close as possible to Fig 6 in a Typical Battery Protection Circuit Precautions

  • Pay attention to the operating conditions for input/output voltage and load current so that the power loss in does not exceed the power dissipation of the package.
  • Do not apply an electrostatic discharge to this that exceeds the performance ratings of the built-in electrostatic protection circuit. Shouding SD 5350A www.shouding.net 2EEV0.
  • 11 - PACKAGE OUTLINE SOT23-5 PACKAGE OUTLINE AND DIMENSIONS SYMB OL DIMENSION IN MILIMETERS DIMENSION 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 1.800 2.000 0.071 0.079 L 0.700 REF 0.028 REF L1 0.300 0.600 0.012 0.024 θ 0° 8° 0° 8° Shouding SD 5350A www.shouding.net 2EEV0.