USERS MANUAL ISL9238EVAL1Z UG074 Rev.2.00 Evaluation Board User Guide Nov 14, 2018 Description Key Features The ISL9238 is a buck-boost Narrow Output Voltage DC (NVDC) Buck-boost NVDC charger for 1-, 2-, 3-, 4-cell Li-ion batteries charger that uses the Renesas advanced R3 Technology to End of Charge (EOC) option provide 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 ISL9238 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 Ideal diode control in Turbo mode safely charges battery packs with up to four cells in a series configuration. Reverse buck, boost, and buck-boost operation from battery Two-level adapter current limit available The ISL9238 has an On-the-Go (OTG) function for 2- and 4-cell battery applications. When the OTG function is enabled, the Battery Ship mode option ISL9238 operates in Reverse Buck mode to provide 5V at the 2 SMBus and auto-increment I C compatible USB port. 2 The ISL9238 provides serial communication with SMBus/I C Specifications that allows programming of critical parameters to deliver a V = 3.8V to 24V (no dead zone) customized solution. The programmable 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 ISL9238EVAL1Z evaluation board demonstrates the f = 1MHz maximum SW performance of the ISL9238. The default value numbers of the battery in series, switching frequency, and the adapter current limit charging function can be programmed by the resistor Ordering Information from the PROG pin to GND. The values also can be set by SMBus. PART NUMBER DESCRIPTION ISL9238EVAL1Z ISL9238 buck-boost charger evaluation board Related Literature For a full list of related documents, refer to our website: ISL9238 datasheet Optional R s1 VSYS VADP Q1 Q4 L1 Q 3 Q2 VSYS CSIN CSOP CSIP Rs2 ASGATE CSON ADP ACIN ISL9238 ACOK BGATE PROCHOT GND AMON/BMON VBAT VBAT BATGONE OTGPG/CMOUT OTGEN/CMIN PSYS FIGURE 1. BLOCK DIAGRAM UG074 Rev.2.00 Page 1 of 17 Nov 14, 2018 UGATE1 SCL LGATE1 SDA COMP BOOT1 PROG PHASE1 PHASE2 DCIN BOOT2 VDD LGATE2 VDDP UGATE2ISL9238EVAL1Z The three LEDs indicate the ACOK, PROCHOT, and Recommended Equipment OTGPG/CMOUT status, respectively. For more details about the 0V to 25V power supply with at least 6A source current capability functions of these three pins, refer to the ISL9238 datasheet. Complete the following steps to evaluate the ISL9238 key Electronic load capable of sinking current up to 6A functions,including system voltage regulation, input current limit Battery emulator capable of sinking and sourcing current up to regulation, Charging mode, trickle Charging mode, and OTG 6A shows the top view of the evaluation board and mode. Figure 3 highlights the key testing points and connection terminals. For Digital Multimeters (DMMs) more information about the ISL9238, including other modes of 100MHz quad-trace oscilloscope datasheet. operation, refer to the ISL9238 NOTE: You can use a power supply (that can source current but cannot sink current) in parallel with an e-load Constant Current (CC) mode to System Voltage Regulation emulate the battery. For example, to charge, set the charging current 1. Set the power supply to 5V. Disable the output and connect command lower than the CC mode e-load. If the e-load CC mode current the (+) end to J1 and the (-) end to J2. is set to 3A, the charge current command is 2A, and the e-load takes 2A from the charger and takes another 1A from the power supply in parallel 2. Ensure jumpers JP3, JP4, and JP6 are shorted. SW1 and SW2 with it. To discharge, the power supply acts like the battery to discharge should switch to the low position. current. You can also use the e-load Constant Voltage (CV) mode to 3. Turn on the power supply and measure VSYS using the DMM emulate the battery to take the charging current from the charger and set across (+) and (-) TP5. VSYS should read 8.38V. The current the e-load CV voltage below the MaxSysV register setting however, this meter on the supply should read <100mA.Slowly increase e-load CV mode cannot source current like a battery. V from 5V to 15V. Monitor PH1 and PH2 to observe IN seamless switching from Boost mode to Buck-Boost mode Functional Description and finally into Buck mode. The ISL9238EVAL1Z provides all circuits required to evaluate the features of the ISL9238. A majority of the features of the Input Current Limit Regulation ISL9238, such as adjustable output voltage, On-the-Go (OTG) 1. Keep V as a constant value between 3.8V and 24V. Set the IN mode, Trickle Charging mode for depleted battery, and system battery emulator voltage to 7.8V and connect the battery power monitor at Buck, Boost, and Buck-Boost modes are emulator output to battery leads J5 and J6. Turn on the available on this evaluation board. battery emulator there is no charge and discharge current for the battery, which is consistent with the BGATE signal of a Quick Start Guide high voltage level. 2. Add an electrical load on VSYS and GND terminals J3 and J4. The number of battery cell and adapter current limit default Turn on the load and increase the electrical load slowly the values can be configured with a standard 1% 0603 resistor (R ) 23 from the PROG pin to GND. The PROG PIN PROGRAMMING input current increases correspondingly and VSYS keeps stable at 8.38V. The output voltage (VSYS) starts dropping as OPTIONS table in the ISL9238 datasheet shows the the input current reaches the 1.5A input current limit. Refer programming options. After the default number of cells in series is set, the default values for MaxSystemVoltage and to the ISL9238 datasheet for more information about the input current limit. If the VSYS voltage is 150mV lower than MinSystemVoltage are set accordingly. These values can also be the battery voltage, the BGATE FET turns on at a low voltage changed through the SMBus control registers in the Renesas GUI, shown in Figure 2 on page 3. level so that the battery supplies the current to the load. UG074 Rev.2.00 Page 2 of 17 Nov 14, 2018