XB6166I2S 小体积锂电池集成保护

XB6166I2S

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One Cell Lithium-ion/Polymer Battery Protection IC

GENERAL DESCRIPTION

The XB6166I2S product is a high integration solution for lithium-ion/polymer battery protection.

XB6166I2S contains advanced power MOSFET, high-accuracy voltage detection circuits and delay circuits. XB6166I2S is put into an ultra-small DFN2X2-6 package and only one external component makes it an ideal solution in limited space of battery pack. XB6166I2S 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 45mΩ RSS(ON) · Ultra-small DFN2X2-6 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: 1.8μA typ. - Power-down Mode: 0.1μA typ. · RoHS Compliant and Lead (Pb) Free

APPLICATIONS

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

Figure 1. Typical Application Circuit

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XB6166I2S

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Overcharge Overcharge Overdischarge Overdischarge Overcurrent Release Detection Release Detection PART PackaDetection Voltage Voltage Voltage Voltage Current NUMBER ge [IOV1] (A) [VDR] (V) [VDL] (V) [VCL] (V) [VCU] (V) XB6166I2DFN2S X2-6 4.30 4.10 2.80 3.0 0.9 Top Mark 6166I2SYW(note) Note: “YW” is manufacture date code, “Y” means the year, “W” means the week

PIN CONFIGURATION

DFN2x2-6

Figure 2. PIN Configuration

PIN DESCRIPTION

XB6166I2S PIN NUMBER 1 2，3 4，5，6 7 PIN NAME VDD GND VM EPAD Power Supply Ground, connect the negative terminal of the battery to this pin The negative terminal of the battery pack. The internal FET switch connects this terminal to GND Please connect EPAD with mass metal GND PIN DESCRIPTION ABSOLUTE MAXIMUM RATINGS

(Note: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability.)

PARAMETER VALUE UNIT VDD input pin voltage VM input pin voltage Operating Ambient Temperature Maximum Junction Temperature Storage Temperature -0.3 to 6 -6 to 10 -40 to 85 125 -55 to 150 - 2 -

V V °C °C °C REV0.4

XB6166I2S

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Lead Temperature ( Soldering, 10 sec) Power Dissipation at T=25°C Package Thermal Resistance (Junction to Ambient) θJA Package Thermal Resistance (Junction to Case) θJCESD 300 0.4 250 130 2000 °C W °C/W °C/W V ELECTRICAL CHARACTERISTICS

Typicals and limits appearing in normal type apply for TA = 25oC, unless otherwise specified

Parameter Detection Voltage Overcharge Detection Voltage Symbol Test Condition Min Typ Max Unit V VCU 4.25 4.05 2.7 2.9 4.30 4.10 2.8 3.0 -0.06 4.35 4.15 2.9 3.1 Overcharge Release Voltage Overdischarge Detection Voltage VCL V V V V A A VDL VDR Overdischarge Release Voltage Charger Detection Voltage Detection Current Overdischarge Current1 Detection Load Short-Circuiting Detection Current Consumption Current Consumption in Normal Operation Current Consumption in power Down VM Internal Resistance Internal Resistance between VM and VDD Internal Resistance between VM and GND FET on Resistance Equivalent FET on Resistance Over Temperature Protection Over Temperature Protection *VCHA VDD=3.6V 0.4 10 IIOV1 0.9 20 1.5 30 *ISHORT VDD=3.5V IOPE IPDN VDD=3.5V VM =0V VDD=2.0V VM pin floating VDD=3.5V VM=1.0V VDD=2.0V VM=1.0V VDD=3.6V IVM =1.0A 1.8 0.1 3 1 μA μA *RVMD *RVMS 320 kΩ kΩ 40 100 45 *RSS(ON) 55 mΩ *TSHD+

120 100 oCOver Temperature Recovery Degree *TSHD- - 3 -

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Detection Delay Time tCU

Overcharge Voltage Detection Delay Time VDD=3.5V VDD=3.5V 130 40 10 75 200 60 20 150 Note: * ---The parameter is guaranteed by design. Overdischarge Voltage Detection tDL Delay Time Overdischarge Current Detection tIOV Delay Time *tSHORLoad Short-Circuiting Detection Delay Time T mS mS mS uS Figure 3. Functional Block Diagram

FUNCTIONAL DESCRIPTION

The XB6166I2S monitors the voltage and current of a battery and protects it from being damaged due to overcharge voltage, overdischarge voltage, overdischarge 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 integrated and its RSS(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 delay time (tCU) or longer, the

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XB6166I2S

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XB6166I2S 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 XB6166I2S turns the charging control FET on and returns to the normal condition. 2, When a load is connected and

discharging starts, the XB6166I2S 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 XB6166I2S 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 XB6166I2S 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.

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 XB6166I2S 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 XB6166I2S. 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 XB6166I2S 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.

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

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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 XB6166I2S 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 (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 time (tCU) or longer, the XB6166I2S 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 XB6166I2S 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 XB6166I2S 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 XB6166I2S stops discharging. When battery voltage falls below overdischarge detection voltage due to overdischarge current, the XB6166I2S stop discharging by overdischarge current

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detection. In this case the recovery of battery voltage is so slow that if battery voltage after overdischarge voltage detection delay time is still lower than overdischarge detection voltage, the XB6166I2S shifts to power-down.

XB6166I2S

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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 overdischarge release voltage (VDU), the normal condition returns.

Note

(1) Some battery providers do not recommend

charging of completely discharged batteries. 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 the normal condition in which discharging is possible. In this case, set the VM pin voltage equal to the GND voltage (short the VM and GND pins or connect a charger) to enter the normal condition.

Figure 4. Overcurrent delay time

0V Battery Charging Function (1) (2) (3) This function enables the charging of a connected 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 voltage

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1．

Overcharge and overdischarge detection

VCUVCU-VHCBatteryvoltageVDL+VDHVDL ONDISCHARGE OFF ON CHARGE OFFVDDVov1VMVSSVCHACharger connectionLoad connection(1) tCU(2)(1)tCL(3)(1)

Figure5-1 Overcharge and Overdischarge Voltage Detection

2．

Overdischarge current detection

VCUVCU-VHCVDL+VDHVDLBattery voltage ONDISCHARGE OFF VDDVSHORTVov2Vov1VSSVMCharger connectionLoad connectiontIOV1(1)(4)(1)tIOV2(4)(1)tSHORT(4)(1)

Figure5-2 Overdischarge Current Detection

Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4)

Overcurrent condition

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3．

Charger Detection

VCUVCU-VHCBatteryvoltageVDL+VDHVDL ONDISCHARGE OFFVDDVMVSSVCHACharger connectionLoad connectiontDL(1)(3)(1)

Figure5-3 Charger Detection

4． Abnormal Charger Detection

VCUVCU-VHCBatteryvoltageVDL+VDHVDL ONDISCHARGE OFF ON CHARGE OFFVDDVM VSSVCHACharger connectionLoad connectiontDL(1)(3)tCU(1)(2)(1)

Figure5-4 Abnormal Charger Detection

Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4)

Overcurrent condition

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XB6166I2S

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As shown in Figure 6, the bold line (high-lined) 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 XB6166I2S.

Fig 6 XB6166I2S 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 XB6166I2S does not exceed the power dissipation of the package.

• Do not apply an electrostatic discharge to this XB6166I2S that exceeds the performance ratings of the built-in electrostatic protection circuit.

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XB6166I2S

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DFN-6L 2MM X 2MM PACKAGE OUTLINE AND DIMENSIONS

SYMBOL Dimension in Millimeters MIN MAX A 0.700 0.800 A1 0.000 0.050 A3 0.175 0.250 b 0.200 0.350 D 1.950 2.050 D2 1.000 1.450 E 1.950 2.050 E2 0.500 0.850 e 0.650 L 0.300 0.400

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Dimension in Inches MIN MAX 0.028 0.031 0.000 0.002 0.007 0.010 0.008 0.014 0.077 0.081 0.039 0.057 0.077 0.081 0.020 0.033 0.026 0.012 0.016

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