CN3051/CN3052 Battery Charger Integrated Circuit Introduction
Source: InternetPublisher:小胖友 Keywords: battery charger Updated: 2024/07/18
USB compatible linear lithium-ion battery charger circuit
Overview:
The CN3051/CN3052 is a constant current/constant voltage charger circuit that can charge a single-cell lithium-ion or lithium-polymer rechargeable battery. The device includes an internal power transistor and does not require an external current sense resistor and blocking diode. The CN3051 and CN3052 require only a few external components and comply with the USB bus specification, making them ideal for portable applications. The thermal modulation circuit can control the chip temperature within a safe range when the device power consumption is relatively large or the ambient temperature is relatively high. The modulated output voltage is 4.1V (CN3051) or 4.2V (CN3052) with an accuracy of 1%. The charging current can be adjusted by an external resistor. When the input voltage (AC adapter or USB power supply) is powered off, the CN3051/CN3052 automatically enters a low-power sleep mode, at which the battery current consumption is less than 3 microamps. Other features include input voltage under-voltage detection, automatic recharge, chip enable input, battery temperature monitoring and status indication.
CN3051/CN3052 adopts 8-pin small outline package (SOP8) with strong thermal management capability.
application:
mobile phone
digital camera
MP3 player
Bluetooth Applications
USB powered charger
Features:
Can charge single-cell lithium-ion or lithium-polymer rechargeable batteries via USB port or AC adapter
On-chip power transistors
No external blocking diode or current sense resistor required
Output voltage 4.1V or 4.2V, accuracy up to 1%
In order to activate deeply discharged batteries and reduce power consumption, a low current pre-charge mode is used when the battery voltage is low.
User programmable constant-current charge current up to 500mA
Charging in constant current/constant voltage/constant temperature mode can both maximize the charging current and prevent the chip from overheating.
Automatically enters low-power sleep mode when power supply voltage drops
Status indication output can drive LED or interface with microcontroller
C/10 Charge end detection
Automatic recharging
Battery temperature monitoring function
Chip enable input
Package form SOP8
Pin arrangement:
Typical application circuit:
Figure 1 Typical application circuit
Ordering Information:
Device Model | Voltage value | Package | Working temperature |
CN3051 | 4.1V | SOP8 | －40℃ to 85℃ |
CN3052 | 4.2V | SOP8 | －40℃ to 85℃ |
Functional Block Diagram:
Figure 2 Functional block diagram
Pin Function Description
Serial number | name | Functional Description |
1 | TEMP | Battery temperature detection input. Connect the TEMP pin to the output of the battery's NTC sensor. If the voltage at the TEMP pin is less than 45% of the input voltage or greater than 80% of the input voltage for more than 0.15 seconds, it means that the battery temperature is too low or too high, then charging will be suspended and the FAULT pin will be pulled low, indicating a battery error state. If TEMP is between 45% and 80% of the input voltage for more than 0.15 seconds, the battery error state will be cleared, the FAULT pin will be in a high impedance state, and charging will continue. If the TEMP pin is connected to ground, the battery temperature monitoring function will be disabled. |
2 | ISET | Constant current charging current setting and charging current monitoring terminal. Connecting an external resistor from the ISET pin to the ground terminal can program the charging current. In the pre-charging stage, the voltage of this pin is modulated at 0.2V; in the constant current charging stage, the voltage of this pin is modulated at 2V. In all modes of the charging state, the voltage of this pin can monitor the charging current according to the following formula: I CH = (V ISET ×1250)／R ISET |
3 | GND | Power Ground |
4 | COME | Input voltage positive input terminal. The voltage of this pin is the working power supply of the internal circuit. When the voltage difference between V IN and BAT pin is less than 40mv, CN3051/CN3052 will enter low power sleep mode, and the current of BAT pin is less than 3uA. |
5 | ONE | Battery connection terminal. Connect the positive terminal of the battery to this pin. When the chip is disabled or in sleep mode, the current of the BAT pin is less than 3uA. The BAT pin provides charging current and a modulation voltage of 4.1V (CN3051) or 4.2V (CN3052) to the battery. |
6 | FAULT | The battery error status indicator of the open-drain output. When the voltage of the TEMP pin is lower than 45% of the input voltage VIN or higher than 80% of the input voltage VIN for more than 0.15 seconds, it means that the battery temperature is too low or too high, and FAULT is pulled down to a low level by the internal switch, indicating a battery error state. Otherwise, the FAULT pin will be in a high impedance state. |
7 | CHRG | The charging status indicator of the open-drain output. When the charger is charging the battery, the CHRG pin is pulled to a low level by the internal switch, indicating that charging is in progress; otherwise, the CHRG pin is in a high impedance state. |
8 | THIS | Chip enable input. A high input level will put CN3051/CN3052 in normal working state; a low input level will put CN3051/CN3052 in disabled state. The CE pin can be driven by TTL level or CMOS level. |
Limit parameters
Pin voltage…………………………－0.3V to 6.5V Maximum junction temperature………………………150℃
BAT pin short circuit duration………Continuous operating temperature….……..－40℃ to 85℃
Electrostatic discharge (HBM)……………….…2KV Storage temperature…..…－65℃ to 150℃
Thermal resistance (SOP8)……………………TBD Soldering temperature (10 seconds)……..…..300℃
Exceeding the above listed limit parameters may cause permanent damage to the device. The above is only the limit range. Working under such extreme conditions, the technical indicators of the device will not be guaranteed, and long-term operation under such conditions will also affect the reliability of the device.
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