IP2312 INJOINIC | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 11
Technical content
1 Features
2applications _ 3Introduction _ www.injoinic.com 1 / 11 V1.0 Switching buck charge management IC. ÿ Synchronous switch step-down charging ÿ 750KHz switching frequency, can support 1uH inductor The size of the solution reduces the BOM cost. IP2312 is packaged in ESOP8 . ÿ Built-in power MOS It requires only a few peripheral components during application and effectively reduces the overall ÿSingle-cell lithium battery/lithium-ion battery charging ÿ Maximum charging current 3A ÿ IC over-temperature protection 750KHz, the maximum charging current is 3A, 5V input, 3.7V/2A conversion ÿ Charging current can be adjusted by external resistor ÿ Charging efficiency 94% (3.7V/2A) ÿ Input overvoltage and undervoltage protection IP2312 Boost Switching Charge Converter Operating Frequency The input voltage of IP2312 is 5V, and the input can intelligently adjust charging. ÿSupport 4.20V/4.30V/4.35V/4.4V battery ÿCharging timeout protection IP2312 is a 5V input that supports single-cell lithium battery synchronization The conversion efficiency is 94%; the charging current can be set through an external resistor. ÿ ESD 4KV ÿ Automatically adjusts the input current and is compatible with small current adapters current to prevent the adapter from being pulled. ÿSupports LED charging status indication IP2312 integrates power MOS and adopts synchronous switching architecture to enable Copyright © 2017, Injoinic Corp. ÿSupport charging NTC temperature protection IP2312 Single-cell lithium battery synchronous switch buck charging IC VIN input NTC VBAT ONE 9(EPAD) 4.5~5.5V ICHG COME RVSET VBAT RNTC SW TEST C1 C2 RICHG Figure 1 Simplified application schematic diagram IP2312 Machine Translated by Google
Copyright © 2016, Injoinic Corp. V1.0 http://www.injoinic.com/ 2 / 11
6 Charging current setting pin
Pin Name Pin Number Pin Description SW Figure 2 IP2312 pin diagram 5V charging input pin ICHG
2 Test pin, connect 1K resistor to the positive terminal of the batteryTEST
1 LED driver pin/battery type selection (IP2312_VSET)
NTC temperature protection, connect NTC resistor GND
5 Connect the positive terminal of the lithium battery
Machine Translated by Google
5.5 3.0 4.15 IN Default charging current 4.5 Junction temperature range IN 4.4 850 maximum symbol recharging current ESD 4.5 5.5 ÿ/W -40 ~ 150 2.4 Input voltage minimum valueparameter A smallest IN unit unit Port input voltage range Hour 750 value Charging end time parameter Human Body Model (HBM) 4.08 IN -0.3 ~ 6.5 4.6 VIN =5VÿVBAT =2.7V 2.1 Input overvoltage protection voltage VIN-OVP Charging system *Beyond these operating conditions, device operating characteristics cannot be guaranteed. symbol IN 5.7 IN Trickle cutoff voltage 2.9 650 typical Charging target voltage Unless otherwise specified, TA=25ÿ, L=1uH, VIN =5V, VBAT=3.7V Input voltage Tstg IN 4.23 unit Charging switching frequency ÿ Thermal resistance (junction temperature to ambient) Input undervoltage protection voltage VIN-UVLO Test Conditions value Excessive exposure time may affect the reliability and service life of the device. 1.8 4.13 300 mA 5.5 2.1 maximum value parameter 5.6 symbol 3.1 4.2 recharge threshold Copyright © 2016, Injoinic Corp. IN ÿ Storage temperature range 4.5 value *Stresses greater than those listed in the Absolute Maximum Ratings section may cause permanent damage to the device under any Absolute Maximum Rating conditions KHz VIN =5VÿVBAT =3.7VÿRICHG =NC 100 KV -60 ~ 150 Typical value Trickle charge current 4.1 A value IP2312 ÿJA COME ITRKL TOP fs VTRGT VTRKL TJ ICHRG COME COME TEND ICHRG- V1.0 http://www.injoinic.com/ 3 / 11 6Recommended working conditions 5 limit parameters 7Electrical Characteristics Machine Translated by Google
V1.0 http://www.injoinic.com/ 4 / 11 LED display driving current 110 40 mÿ Battery input standby current ISTB uA 10 mA Thermal shutdown temperature Copyright © 2016, Injoinic Corp. 150 ÿ Thermal shutdown recovery temperature TOTP drop temperature 35 mÿ TOTP rising temperature VIN =0VÿVBAT =3.7V NMOS on-resistance 100 ÿ 135 PMOS on-resistance Machine Translated by Google
Synchronous Switching Buck Converter Block diagram structure IP2312 Figure 3 IP2312 internal block diagram IP2312 integrates a Buck synchronous switching step-down charge controller with a switching frequency of 750KHz, 5V input, and an efficiency of 94% at 3.7V/2A output. Copyright © 2016, Injoinic Corp. V1.0 http://www.injoinic.com/ 5 / 11 SW LED driver L=1uH CONTROL ICHG COME VBAT+ ONE NTC Charger driver NTC D1 PMOS ICHG SYSTEM NMOS 8Function description Machine Translated by Google
BAT voltage(V) 3A charging current 1A charging current 2A charging current IP2312 n(%) IP2312 charging efficiency curve VIN=5V Charging process Charging protection http://www.injoinic.com/ 6 / 11 V1.0 ÿ IP2312 integrates VIN input overvoltage protection. When IP2312 detects that the input voltage (voltage on pin 8) is higher than 5.6V, it will stop charging. ÿ When the battery voltage is close to 4.2V and the charging current is less than 300mA, it enters constant voltage charging mode. After entering the constant voltage mode, it will stop charging after every 4 minutes and check whether the battery voltage is higher than 4.15V: if it is higher than 4.15V, stop charging; otherwise, continue charging, and then check after another 4 minutes. ÿ IP2312 integrates VIN input under-voltage protection. The VIN input loop will automatically adjust the charging current. When IP2312 detects that the input voltage (voltage on pin 8) is lower than 4.5V, it will reduce the charging current to make the input voltage (voltage on pin 8) lower than 4.5V. The voltage on pin 8) is stable at 4.5V to ensure that the adapter will not be pulled to death. ÿ When the battery voltage is greater than 3V, it enters the constant current charging mode and charges the battery with the set constant charging current. IP2312 has complete protection functions. The built-in soft-start function prevents faults caused by excessive inrush current during startup, and integrates input overvoltage, undervoltage, overtemperature and other protection functions to ensure stable and reliable operation of the system. ÿ When the battery voltage is lower than 3V, it enters the trickle charging mode and charges the battery with a charging current of 100mA. Copyright © 2016, Injoinic Corp. electricity. IP2312 adopts complete CC/CV charging mode. ÿ When the battery is fully charged, if it detects that the battery voltage is lower than 4.1V, it will start charging the battery again. Machine Translated by Google
V1.0 http://www.injoinic.com/ 7 / 11 Constant current charging current setting Battery type selection (only supported by IP2312_VSET model) IP2312 ICHG RICHG ICHG=135000 / RICHG The constant current charging current ICC can be set by the external resistor RICHG on the ICHG pin. The set current is the constant current charging current at the battery end: 45Kohm ÿ IP2312 integrated over-temperature protection function: When IP2312 detects that the chip temperature reaches 135ÿ, it will stop charging; when the temperature drops to 85ÿ, 4.35V NC Default value 2.1A 43K 1% Typical current recommended resistor: NC RVSET on D1 (pin 1) 100K 1% 135Kohm 4.2V
91 Kohm
When the temperature is higher than 43 degrees, the charging current is reduced by half; when the temperature is higher than 45 degrees, charging is stopped. ICC=135000 / RICHGÿ 1.5A 4.3V ÿ IP2312 integrated charging timeout protection: When the charging time exceeds 24 hours, charging will be forcibly stopped. IP2312 only considers that the temperature returns to normal and restarts charging; 4.4V IP2312 supports 4.2V lithium batteries by default. IP2312_VSET supports connecting pull-down resistors of different values to D1 (pin 1) to select the corresponding The battery type is multiplexed with the LED display output, as shown in the typical application schematic: 75K 1% ICHG terminal resistance RICHG battery terminal constant current charging current ICC Copyright © 2016, Injoinic Corp. Battery type selection (battery full voltage) ÿ IP2312 integrates NTC temperature protection function and cooperates with NTC thermistor to charge normally when the temperature is detected within the range of 0~43 degrees; when the temperature is Machine Translated by Google
0.38 destroy -20 Figure 4 NTC block diagram -10 1.49 ÿ When NTC detects that the temperature is within the range of 0~43 degrees, it charges normally. When the temperature is higher than 43 degrees, the charging current is reduced by half; when the temperature 1.44 ÿ If the NTC function is not needed, you can connect the NTC to ground with a 51K resistor. The NTC pin cannot be left floating, otherwise it may cause abnormal charging. IP2312 supports 1 or 2 LED indicators: Copyright © 2016, Injoinic Corp. 0.60 state Example: RNTC=100K @25ÿ thermistor (B=4100), R2=82K, corresponding temperature and NTC voltage: 0.49 IP2312 supports NTC protection function. It detects the battery temperature through the NTC pin. When the detected temperature exceeds the set temperature, the charger is turned off. Temperature (degrees) Internal judgment voltage (V) 0.43 During the charging process, it lights up and turns off when the battery is fully charged. 0.33 Bright -15 1.52 When the temperature is higher than 45 degrees, stop charging. 1.32 ÿ Discharge 20uA current from NTC, connect an external resistor to GND on NTC, and judge the temperature range by the voltage drop generated by this current on the resistor. 0.56 IP2312 ÿ 2 lights ÿ 1 light 8 / 11 V1.0 http://www.injoinic.com/ VL=1.32v Comparator NTC RNTC 20uA HT If the measured voltage on the NTC pin is higher than 1.32v, it means the battery temperature is too low. If the measured voltage on the NTC pin is lower than 0.60v, it means the battery temperature is too high. LT If the measured voltage on the NTC pin is lower than 0.56v, it means the battery temperature is too high VH=0.56v VM=0.60v Charging NTC Charging LED indication Machine Translated by Google
135K 4.3V recharging current NC 4.2V 45K 2.1A (default) 4.4V 43K 1.5A 4.35V NC (no answer) 9Typical application schematics IP2312 Figure 5 Typical application schematic diagram RICHG One light mode 0.5R 100R 1uH 100K@25ÿ The ground loop of EPAD should be as small as possible 82K C1 and C2 are placed close to IP2312, and 22uF The charging current can be set through RICHG 100R ONE VBAT COME 10uF B=4100 The function of R2 and C6: can absorb the high-voltage pulse generated when the charger is inserted and protect IP2312 22uF The ground of C1 and C2 goes to the bottom of IP2312 SW RVSET 9(EPAD) Two light mode 100R If the NTC function is not required, the NTC PIN cannot be left floating and must be connected to ground with a 51K resistor. ICHG VBAT 10uF TEST 22uF NTC RNTC VIN input 4.5~5.5V IP2312_VSET You can select the battery type (full voltage) by connecting different resistors RVSET to LED1 (PIN 1) VBAT D1Status charging charging process 0.5Hz flashing Copyright © 2016, Injoinic Corp. fullness Bright 9 / 11 V1.0 http://www.injoinic.com/ IP2312 ICC=135000 / RICHG Machine Translated by Google
D c MIN 2.09 0.38 4.90 0.43 L 1.40 0.05 AND 0.15 0.50 MAX 0.21 6.00 0.25 0.65 MILLIMETER 8th 1.50 1.30 6.20 5.80 0.60 1.65 3.90 0.21 0.19 i NAME 0.70 0.60 Copyright © 2016, Injoinic Corp. 3.70 1.05BSC 4.10 1.27BSC 5.10 4.70 0.41 SYMBOL b 2.09 0.48 0.39 0.20 It is A 0.80 IP2312 10 / 11 V1.0 http://www.injoinic.com/ 10Package information Machine Translated by Google
None of the representations assumes any responsibility or liability. Terms and conditions of sale as provided at the time. Copying is only allowed under the circumstances. Yingjixin assumes no responsibility or liability for such tampered documents. Copying third party information may require You should obtain the latest relevant information before placing an order and verify that this information is complete and up-to-date. All products are sold according to the order confirmation For Yingjixin's product manuals or data sheets, only if there is no tampering with the content and the relevant authorizations, conditions, restrictions and statements are included. Yingjixin will update the content of this document from time to time. The actual parameters of the product may vary due to different models or other matters. This document does not Use your own responsibility. To minimize risks associated with customer products and applications, customers should provide adequate design and operational safety verification. Customer acknowledges and agrees that, although any application-related information or support may still be provided by Yingjixin, they will be solely responsible for meeting the requirements of their product Yingjixin Technology Co., Ltd. assumes no obligation for application assistance or customer product design. Customers should be responsible for the products and applications they use Yingjixin Additional restrictions apply. with all the expertise and knowledge required to implement safety measures, to foresee the dangerous consequences of faults, to monitor faults and their consequences, to reduce the risk of for any express or implied warranty or authorization Loss of all express or implied authorizations for related Yingjixin products, and this is an unfair and fraudulent business practice. Yingjixin is not responsible for any such false products and all legal, regulatory and safety-related requirements related to the use of Yingjixin products in their applications. Customer represents and agrees that they have the ability to develop When reselling Yingjixin products, if the statement of the product parameters is different or false compared with the parameters marked by Yingjixin, it will Yingjixin Technology Co., Ltd. reserves the right to make corrections, modifications, enhancements, improvements or other changes to the products and services provided, Customer Any loss caused to Yingjixin and its agents due to the core products. Copyright © 2016, Injoinic Corp. The probability of malfunction causing personal injury and taking appropriate remedial measures. The customer will fully indemnify the customer for any use of any Yingji in such critical applications. IP2312 V1.0 http://www.injoinic.com/ 11 / 11 Responsibility and Copyright Statement Machine Translated by Google