XB4301D
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One Cell Lithium-ion/Polymer Battery Protection IC
GENERAL DESCRIPTION
The XB4301 series product is a high integration solution for lithium-ion/polymer battery protection. XB4301 contains advanced power MOSFET, high-accuracy voltage detection circuits and delay circuits. XB4301 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.
XB4301 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 54mΩ RDS(ON) · Ultra-small SOT23-5 Package · Only One External Capacitor Required
· Over-temperature Protection · Overcharge Current Protection · Three-step Overcurrent Detection: -Overdischarge Current 1 -Overdischarge Current 2 -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: 0.1μA max. · RoHS Compliant and Lead (Pb) Free
APPLICATIONS
• One-Cell Lithium-ion Battery Pack • Lithium-Polymer Battery Pack
BAT +VM4XB43013VDDBattery1VCCC0.1uF2GNDVM5BAT - Figure 1. Typical Application Circuit
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XB4301D
____________________________________________________________________________________________________________________________ORDERING INFORMATION
OverchargOvercharge Overdischarge Overdischarge Overcurrent
Detection Release Detection PART Packe Detection Release
Voltage Voltage Voltage Voltage Current NUMBER age
[IOV1] (A) [VCL] (V) [VDL] (V) [VDR] (V) [VCU] (V) XB4301D
SOT
23-5
4.250
4.10
2.90
3.0
2.5
Top Mark
4301DYW(note)
Note: “YW” is manufacture date code, “Y” means the year, “W” means the week
PIN CONFIGURATION
5VM4VMVCCGNDVDD123SOT23-5
Figure 2. PIN Configuration
PIN DESCRIPTION
XB4301 PIN NUMBER
1 2
PIN NAME VCC GND
Core circuit power supply
Ground, connect the negative terminal of the battery to this pin
PIN DESCRIPTION
3 VDD Power Supply
The negative terminal of the battery pack. The internal FET switch 4,5 VM connects this terminal to GND
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.) Input voltage between VCC and GND VDD input pin voltage VM input pin voltage
Operating Ambient Temperature
-0.3 to +6 -0.3 to VCC+0.3
-6 to 10 -40 to 85
V V V °C
PARAMETER VALUE UNIT １５７，６６２６，４８５６
Storage Temperature
XB4301D
125 °C -55 to 150
0.4
°C W
300 °C 250 °C/W 130 °C/W ____________________________________________________________________________________________________________________________ Maximum Junction Temperature 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 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
VDD=3.5V VDD=3.5V 4.20 4.05 2.8 2.9 -0.07 4.25 4.10 2.9 3.0 -0.12 4.30 4.15 3.0 3.1 -0.2 Overcharge Release Voltage Overdischarge Detection Voltage
VCL
V V V V A A A VDL VDR VCHA
Overdischarge Release Voltage Charger Detection Voltage Detection Current Overdischarge Current1 Detection Overdischarge Current2 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
IIOV1 IIOV2
1.25 4 10
2.5 6 20 3.75 9 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
2.8 0.1 6
μA μA
RVMD RVMS
320
kΩ kΩ
100
54 RDS(ON)
mΩ
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Over Temperature Protection
TSHD+
XB4301D
120 100 ____________________________________________________________________________________________________________________________
oC
Over Temperature Recovery Degree TSHD- Detection Delay Time Overcharge Voltage Detection Delay Time
Overdischarge Voltage Detection Delay Time
Overdischarge Current 1 DetectionDelay Time Overdischarge Current 2 Detection Delay Time
Load Short-Circuiting Detection Delay Time
tCU tDL tIOV1 tIOV2 tSHORT 0.17 0.25 0.4 S
28 40 60 mS mS
1 2 4 mS 5
8
12
5 50 uS
VDD=3.5V VDD=3.5V VDD=3.5V Figure 3. Functional Block Diagram
FUNCTIONAL DESCRIPTION
The XB4301 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 RDS(ON) is as low as 54 mΩ typical.
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XB4301D
____________________________________________________________________________________________________________________________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 XB4301 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 XB4301 turns the charging control FET on and returns to the normal condition. 2, When a load is connected and
discharging starts, the XB4301 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 XB4301 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 XB4301 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
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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 XB4301 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 XB4301.
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 XB4301 turns the FET on and changes to the normal condition from the
XB4301D
____________________________________________________________________________________________________________________________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.
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 XB4301 turns off the discharging control FET to stop discharging. This condition is called overcurrent condition. (The overcurrent includes overcurrent 1, overcurrent 2, 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 1 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 XB4301 turns the charging control FET off and stops
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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 XB4301 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 XB4301 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 XB4301 stops
XB4301D
____________________________________________________________________________________________________________________________discharging. When battery voltage falls below overdischarge detection voltage due to overdischarge current, the XB4301 stop discharging by overdischarge current
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 XB4301 shifts to power-down.
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+
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and B- pins, the charging control FET gate is fixed to VDD potential. When the voltage 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.
TIMING CHART
XB4301D
____________________________________________________________________________________________________________________________1． Overcharge and overdischarge detection
VCUVCU-VHCBatteryvoltageVDL+VDHVDL ON
DISCHARGE
OFF ON
CHARGE
OFFVDDVMVov1
VSSVCHACharger connectionLoad connection(1)
tCU(2)(1)tCL(3)(1)
Figure5-1 Overcharge and Overdischarge Voltage Detection
2． Overdischarge current detection
VCU
VCU-VHCVDL+VDHVDL
Battery voltage
ON
DISCHARGE
OFF
VDD
VSHORTVov2Vov1VSS
VMCharger connectionLoad connectiontIOV1(1)(4)(1)tIOV2(4)(1)tSHORT(4)(1)
Figure5-2 Overdischarge Current Detection
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XB4301D
____________________________________________________________________________________________________________________________Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4)
Overcurrent condition
3． Charger Detection
VCUVCU-VHCBatteryvoltageVDL+VDHVDL
ON
DISCHARGE
OFFVDDVM
VSSVCHACharger connectionLoad connectiontDL(1)(3)(1)
Figure5-3 Charger Detection
4． Abnormal Charger Detection
VCUVCU-VHCBatteryvoltageVDL+VDHVDL
ON
DISCHARGE OFF ON
CHARGE
OFFVDDVM
VSSVCHACharger connectionLoad connectiontDL(1)(3)tCU(1)(2)(1)
Figure5-4 Abnormal Charger Detection
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XB4301D
____________________________________________________________________________________________________________________________Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4)
Overcurrent condition
TYPICAL CHARACTERISTICS
(Test based on XB4301D version, VBAT = 3.6V, TA= 25°C unless otherwise specified) Internal FET On-Resistance vs. Junction Temperature
Power Dissipation vs. Charging Current
TYPICAL APPLICATION
As shown in Figure 5, 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. C is a decoupling capacitor which should be placed as close as possible to XB4301. BAT +XB43013( B+/P+ )VM4VDDBattery1ChargerLoadVCCC 0.1uF2GNDVM5BAT -( P- )
( B- )Fig 5 XB301 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 XB4301 does not exceed the power dissipation of the package.
• Do not apply an electrostatic discharge to this XB4301 that exceeds the performance ratings of the built-in electrostatic protection circuit.
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深圳市思微半导体有限公司
PACKAGE OUTLINE
SOT23-5 PACKAGE OUTLINE AND DIMENSIONS
XB4301D
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DIMENSION
SYMB
IN
DIMENSION
OL
MILIMETERS IN INCHES
MIN
MAX MIN MAXA 1.0501.250 0.041 0.049A1 0.0000.100 0.000 0.004A2 1.0501.150 0.041 0.045b 0.3000.400 0.012 0.016c 0.1000.200 0.004 0.008D 2.8203.020 0.111 0.119E 1.5001.700 0.059 0.067E1 2.6502.950 0.104 0.116
e
0.950 TYP
0.037 TYP
e1 1.8002.000 0.071 0.079
L 0.700 REF 0.028 REFL1 0.3000.600 0.012 0.024
θ 0° 8° 0° 8°
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