USERS MANUAL ISL9237EVAL2Z UG075 Rev 3.00 Evaluation Board User Guide November 4, 2016 Description Key Features The ISL9237 is a buck-boost Narrow Output Voltage DC (NVDC) Buck-boost NVDC charger for 1-, 2-, 3-cell Li-ion batteries charger utilizing Intersils advanced R3 Technology to provide End of Charge (EOC) option high light-load efficiency, fast transient response, and System power monitor PSYS output, IMVP-8 compliant seamless DCM/CCM transitions for a variety of mobile and industrial applications. PROCHOT open-drain output, IMVP-8 compliant Allows trickle charging of depleted battery In Charge mode, the ISL9237 takes input power from a wide range (4V to 20V) of DC power sources (conventional AC/DC Optional ASGATE FET control charger adapters, USB PD ports, travel adapters, etc.) and safely Ideal diode control in Turbo mode charges battery packs with up to three cells in a series configuration. Reverse buck, boost, and buck-boost operation from battery Two-level adapter current limit available The ISL9237 supports On-the-Go (OTG) function for 2- and 3-cell battery applications. When OTG function is enabled, the Battery Ship mode option ISL9237 operates in Reverse Buck mode to provide 5V at the 2 SMBus and auto-increment I C compatible USB port. 2 The ISL9237 has serial communication via SMBus/I C that Specifications allows programming of many critical parameters to deliver a V = 3.8V to 24V (no dead zone) customized solution. These programming parameters include, IN but are not limited to: adapter current limit, charger current V = 2.5V to 12.6V OUT limit, system voltage setting, and trickle-charging current limit. MAX I up to 6A charge The ISL9237EVAL2Z evaluation board is designed to f = 1MHz maximum SW demonstrate the performance of the ISL9237. The default value numbers of the battery in series, the switching frequency, and the adapter current limit charging function can Ordering Information be programmed by the resistor from the PROG pin to GND. Those values also can be set by SMBus. PART NUMBER DESCRIPTION ISL9237EVAL2Z ISL9237 buck-boost charger evaluation board Related Literature For a full list of related documents please visit our website - ISL9237 product page OPTIONAL Rs1 VSYS VADP Q1 Q4 L1 Q3 Q2 VSYS CSIN CSOP CSIP R ASGATE s2 CSON ADP ACIN ISL9237 ACOK BGATE PROCHOT GND AMON/BMON VBAT VBAT BATGONE OTGPG/CMOUT OTGEN/CMIN PSYS FIGURE 1. BLOCK DIAGRAM UG075 Rev 3.00 Page 1 of 17 November 4, 2016 SCL UGATE1 LGATE1 SDA COMP BOOT1 PROG PHASE1 PHASE2 DCIN BOOT2 VDD LGATE2 VDDP UGATE2ISL9237EVAL2Z programming options. After the default number of cells in series Recommended Equipment are set, the default values for MaxSystemVoltage and 0V to 25V power supply with at least 6A source current capability MinSystemVoltage are set accordingly. These values can also be changed through the SMBus control registers, which are Electronic load capable of sinking current up to 6A implemented with the Intersil GUI, shown in Figure 2 on page 3. Battery emulator capable of sinking and sourcing current up to Three LEDs are indicating ACOK, PROCHOT, and OTGPG/CMOUT 6A status, respectively. For more details about the functions of these Digital Multimeters (DMMs) three pins, refer to the ISL9237 datasheet. Follow these steps to evaluate the ISL9237 key functions,including system voltage 100MHz quad-trace oscilloscope regulation, input current limit regulation, Charging mode, Trickle NOTE: Customers can use a power supply (which can source but cannot Charging mode, and OTG mode. Figure 3, which is the top view of sink current) in parallel with an e-load Constant Current (CC) mode to the evaluation board, highlights the key testing points and emulate the battery. For example, for charging, set the charging current connection terminals. For other modes or more information command lower than the CC mode e-load. If the e-load CC mode current about ISL9237, please refer to the ISL9237 datasheet. is set at 3A, the charge current command is 2A, then the e-load will take 2A from the charger and take another 1A from the power supply in System Voltage Regulation parallel with it. For discharging, the power supply is just like the battery to discharge current. The user can also use the e-load Constant Voltage (CV) 1. Set the power supply to 5V and, with the output disabled, mode to emulate the battery to take the charging current from the charger connect the (+) to J1 and the (-) end to J2. and set the e-load CV voltage below the MaxSysV register setting, however, 2. Ensure jumpers JP3, JP4, and JP6 are shorted. SW1 and SW2 this e-load CV mode cannot source current like a battery. should switch to the low position. 3. Turn on the power supply, measure VSYS using the DMM Software Requirement across (+) and (-) TP5. VSYS should read 8.38V. The current The ISL9237 evaluation board needs to be used with the required meter on the supply should read <100mA. Increase V from IN software. The ISL9237 evaluation kit software can be found on 5V to 15V slowly. Monitor PH1 and PH2 to observe seamless . our website switching from Boost mode to Buck-Boost mode and finally into Buck mode. ISL9237 evaluation kit software consists of the ISL9237 evaluation software, SMBus USB driver README file, and the Input Current Limit Regulation software installation guide. 1. Keep V as a constant value between 3.8V and 24V. Set the IN battery emulator voltage to 7.8V, connect the battery Functional Description emulator output to battery leads, J5 and J6. Then, turn on the The ISL9237EVAL2Z provides all circuits that are required to battery emulator there is no charge and discharge current for evaluate the features of the ISL9237. A majority of the features the battery, which is consistent to the BGATE signal of a high of the ISL9237, such as adjustable output voltage, On-the-Go voltage level. (OTG) mode, Trickle Charging mode for depleted battery, and 2. Add an electrical load on VSYS and GND terminals, J3 and J4. system power monitor at buck, Boost and Buck-Boost modes are Turn on the load and increase the electrical load slowly the available on this evaluation board. input current increases correspondingly and VSYS keeps stable at 8.38V. The output voltage (VSYS) will start dropping Quick Start Guide as the input current reaches the 1.5A input current limit. For 9237 datasheet. the input current limit details, refer to the ISL The number of battery cell and adapter current limit default If the VSYS voltage is 150mV lower than the battery voltage, values can be configured with a standard 1% 0603 resisor (R ) 23 BGATE FET will turn on at a low voltage level, such that the from the PROG pin to GND. The PROG PIN PROGRAMMING battery supplies the current to the load. OPTIONS table in the ISL9237 datasheet shows the UG075 Rev 3.00 Page 2 of 17 November 4, 2016