The charger is a multi -state (level 2) lithium -ion battery charger (constant current/constant voltage) that can provide up to 2A charging current single battery lithium ion batteries. LX2201 is a cost -effective, high -performance USB battery charger. The LX2201 type has a 2A high -charging current using an isolated automatic energy -saving battery topology. The user's programmable USB is charged, and the battery life is low. RDSON discharge. In the USB mode, the LX2201 has an advantageous USB limit control circuit compared with the competitive charger. The low RDSON is in the discharge mode. USB restricting control circuit allows charging when running at the same time. Provide load VDD independent of VBAT charging logic. Low RDSON in discharge mode provides low loss and temporary temporary. The cost of LX2201 is very low integrated battery charger solution. This only requires three external resistors: one is used to set the constant charging current level, 1 sets the terminal charging current, and the other is used to set VIN. It also has a charging current that keeps the mold temperature in the automatic temperature -module not exceeding 150 ° C; this feature ensures that the LX2201 provides the maximum charging given heat environment. LX2201 supports two lithium ion battery chemistry; 4.1V and 4.2V to logical input (VM pin). High -precision current influenza circuit allows batteries to be fully charged before termination. LX2201 design System load when the lithium -ion battery is used to charge by the lithium -ion battery from prematurely discharged and independent battery terminal voltage. LX2201 provides charging status indicator. Integrated PMOS PASS elements have a low voltage drop, and at the same time, a inherent load is disconnected from disable or power supply is disconnected. Another battery load cutting switch is integrated, which provides switching and discharge modes when seamless power charging conversion. LX2201 has a regulatory mode of a pre -charging function battery, as well as a long -term charger with a charging mode for the remaining battery on the ceiling. LX2201 has a high power 4mm x 4mm, 20 -pin MLP, and the surface is installed.

Main features

2A charging current

USB compatible charging status

Low RDSON

Power saving and conditional conditions

Deep Play Electricity Mode

Optional 4.1V lithium -ion battery or 4.2V application

CAN

Starting the opposite direction

Package

Application

Battery rating from 350mAh to 2AH

Mobile

[ 123] Storage temperature range -65 ° C to 150 ° C

Packaged welded return welding peak temperature. (Maximum exposure time 40 seconds) 260 degrees Celsius (+0, -5)

VIN maximum DC current 500mA

VIN maximum wave current 2A

Note: exceeding these rated rated rated rated Value may damage the device. All voltage and ground. The current is a positive input and a negative output specified terminal.

Hot Data

LQ Plastic Microfilled Framework Four -core encapsulation of 20 stitches

Environmental thermal resistance, θja 40 ° C/W

Calculation of knot temperature calculations : TJ u003d TA+(pd xθja).

θja is a guide to the thermal performance of the equipment/PC board system. All above assumes no environmental airflow.

Electrical features

Unless there are other regulations, the following specifications are applicable to the working environment temperature 0 ° C ≤ TA ≤ 70 ° C. Unless otherwise explained, the test conditions are as follows: VDD u003d 5.0V.

General instruction Use two steps of ion batteries: constant stream steps and then constant pressure steps. The basic charger function uses VDD pins as input, and the BAT pin is used as output. The LX2201 charger has a programmable maximum current (which can be programmed between the needle and the GND through the resistance value). The low voltage difference between PASS elements allows batteries to be adjusted from loosening. In the constant pressure mode,The battery terminal voltage can be adjusted to 4.1V or 4.2V in the following ways to tie the VM pin on VDD or GND, respectively. This charger will terminate the constant voltage charging current below the minimum current (can be used to ground with needle -footed CTP). LX2201 has an integrated thermostat thermostat, which will prevent charging from charging and preventing the temperature of the internal mold from more than 150OC. This function prevents the damage system board from the IC that exceeds its thermal temperature.

The adjustment of the current was applied to the depth discharge and the terminal voltage was less than 60%of the constant voltage level. The adjustment current is 5%of the CCP programmable constant current (unless it may be restricted in the USB state). The level of a battery terminal voltage exceeds 60%, that is, the constant current level (unless the charging current is limited by another charger control loop).

Charging termination mode

In order to extend the life of the system and avoid floating charging, once the battery is fully charged. The state of charging ending occurs at the end of the constant voltage mode. Charged the status after the charging state is completed.

The mode turns off the charging

After the charger completes the charging cycle, if the power supply is kept connected, the LX2201 input voltage monitoring mode. In this mode, LX2201 monitors the battery terminal voltage, if the battery voltage drops more than 3%of the full range. This is not used for unused devices. The USB charging mode LX2201 fully conforms to support the USB specification-low-power peripheral equipment (100mA) and high-power peripheral equipment (500 mAh). VID1 logic input selects USB charging current. LX2201 induction from VDD to terminal current terminals; then by lowering the current from VDD to VBAT. Note: The USB charging limit circuit does not limit the input current and only shrinks the charging current.

discharge method

In the discharge mode, VID0 indicates that the discharge mode is enabled. The system load is connected to VDD. The input power is connected to the VDD through the internal diode. When the input power supply is disconnected, the battery current flows from VBAT to VDD. The circuit in Figure 3 is displayed in the LX2201 AC adapter and USB input configured in the discharge mode. The USB input is a diode or input VDD pin, and uses MOSFET to reduce the diode through the O -type diode. LX2201 provides control MOSFET charging and discharge modes. When the AC and USB power application PSW signal is turned off by the AC adapter, the diode and MOSFET are turned off

Flow -limiting power supply

When using a limited input power supply or high power impedance, battery charging current, battery charging current, And/or load current pulls the VDD pins very close to the battery terminal voltage. This may lead to LX2201 into an uncertain state, which is charging and discharge mode in this state. In order to prevent this, PNP can be added with diagramsThe differential amplifier circuit in 4; this circuit adds an additional control circuit to adjust the battery capacity by reducing the battery capacity, the net empty space of the charger reaches 300 millibolia charging current. The internal power switch within LX2201 requires the strength of the power switch from the discharge mode to the charging mode. If the power supply is a serious current limit, LX2201 may not be able to turn on the power switch. In this case, a small amount of current will allow flowing into the battery without regulating. If you leave in this state, the current will eventually cause the battery terminal voltage internal protection circuit to disconnect the circuit. Generally speaking, LX2201 requires at least 80mA currents in USB mode and 200mA to use VDD input to force switching to the charging mode. Alternatively, if the weak power supply is used, the switching from the discharge mode to the charging mode can instantly set the VID0 and VID1 to a low state. The state will turn on the power switch and allow the VDD voltage to rise. LX2201 can enter the charging mode.

USB compatibility

In order to comply with USB specifications,+5V must be less than 500mA under low -power mode at low power mode. If the configuration of the LX2201 is shown in Figure 3, this is the possible USB current that can consume the system that exceeds the maximum value (in this case, the battery charging current will be completely reduced). If not, it is necessary to budget from the USB power and strictly abide by the USB power supply. In this case, the system load can be directly applied to the battery, and the LX2201 can prevent load+batteries from more power compatibility than now. A better method is to provide battery isolation that can be available; in this method, the operation amplifier circuit provides a current limiter to exceed USB power restrictions. Only when the adapter or USB is input, the battery will be removed or limited.

Layout Guide

Place 10 μF ceramic capacitors near VDD and VBAT IC terminals in the layout of LX2201 to filter the switch transient.

Provide a low -heat impedance from the bottom of the hot pad LX2201 to be packaged to the maximum extent of the circuit ground plate.