ISL9237EVAL2Z

USER’S MANUAL ISL9237EVAL2Z UG075 Rev 3.00 November 4, 2016 Evaluation Board User Guide Description Key Features The ISL9237 is a buck-boost Narrow Output Voltage DC (NVDC) charger utilizing Intersil’s advanced R3™ Technology to provide high light-load efficiency, fast transient response, and seamless DCM/CCM transitions for a variety of mobile and industrial applications. • Buck-boost NVDC charger for 1-, 2-, 3-cell Li-ion batteries In Charge mode, the ISL9237 takes input power from a wide range (4V to 20V) of DC power sources (conventional AC/DC charger adapters, USB PD ports, travel adapters, etc.) and safely charges battery packs with up to three cells in a series configuration. • Allows trickle charging of depleted battery The ISL9237 supports On-the-Go (OTG) function for 2- and 3-cell battery applications. When OTG function is enabled, the ISL9237 operates in Reverse Buck mode to provide 5V at the USB port. • Two-level adapter current limit available The ISL9237 has serial communication via SMBus/I2C that allows programming of many critical parameters to deliver a customized solution. These programming parameters include, but are not limited to: adapter current limit, charger current limit, system voltage setting, and trickle-charging current limit. Specifications The ISL9237EVAL2Z evaluation board is designed to 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 be programmed by the resistor from the PROG pin to GND. Those values also can be set by SMBus. • fSW = 1MHz maximum • End of Charge (EOC) option • System power monitor PSYS output, IMVP-8 compliant • PROCHOT# open-drain output, IMVP-8 compliant • Optional ASGATE FET control • Ideal diode control in Turbo mode • Reverse buck, boost, and buck-boost operation from battery • Battery Ship mode option • SMBus and auto-increment I2C compatible • VIN = 3.8V to 24V (no dead zone) • VOUT = 2.5V to 12.6V • MAX Icharge up to 6A Ordering Information PART NUMBER Related Literature ISL9237EVAL2Z DESCRIPTION ISL9237 buck-boost charger evaluation board • For a full list of related documents please visit our website - ISL9237 product page VADP OPTIONAL Rs1 VSYS Q1 Q4 L1 LGATE2 PHASE2 BOOT2 PHASE1 BOOT1 UGATE1 LGATE1 UGATE2 Q3 Q2 VSYS CSOP CSIN CSIP Rs2 ASGATE CSON ADP ACIN ISL9237 ACOK BGATE PROCHOT# GND AMON/BMON VBAT BATGONE VBAT OTGPG/CMOUT OTGEN/CMIN VDDP VDD DCIN PROG COMP SCL SDA PSYS FIGURE 1. BLOCK DIAGRAM UG075 Rev 3.00 November 4, 2016 Page 1 of 17 ISL9237EVAL2Z Recommended Equipment • 0V to 25V power supply with at least 6A source current capability • Electronic load capable of sinking current up to 6A • Battery emulator capable of sinking and sourcing current up to 6A • Digital Multimeters (DMMs) • 100MHz quad-trace oscilloscope NOTE: Customers can use a power supply (which can source but cannot sink current) in parallel with an e-load Constant Current (CC) mode to emulate the battery. For example, for charging, set the charging current command lower than the CC mode e-load. If the e-load CC mode current 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 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) mode to emulate the battery to take the charging current from the charger and set the e-load CV voltage below the MaxSysV register setting, however, this e-load CV mode cannot source current like a battery. Software Requirement The ISL9237 evaluation board needs to be used with the required software. The ISL9237 evaluation kit software can be found on our website. ISL9237 evaluation kit software consists of the ISL9237 evaluation software, SMBus USB driver README file, and the software installation guide. Functional Description The ISL9237EVAL2Z provides all circuits that are required to evaluate the features of the ISL9237. A majority of the features of the ISL9237, such as adjustable output voltage, On-the-Go (OTG) mode, Trickle Charging mode for depleted battery, and system power monitor at buck, Boost and Buck-Boost modes are available on this evaluation board. Quick Start Guide The number of battery cell and adapter current limit default values can be configured with a standard 1% 0603 resisor (R23) from the PROG pin to GND. The “PROG PIN PROGRAMMING OPTIONS” table in the ISL9237 datasheet shows the UG075 Rev 3.00 November 4, 2016 programming options. After the default number of cells in series are set, the default values for MaxSystemVoltage and MinSystemVoltage are set accordingly. These values can also be changed through the SMBus control registers, which are implemented with the Intersil GUI, shown in Figure 2 on page 3. Three LEDs are indicating ACOK, PROCHOT, and OTGPG/CMOUT status, respectively. For more details about the functions of these three pins, refer to the ISL9237 datasheet. Follow these steps to evaluate the ISL9237 key functions,including system voltage regulation, input current limit regulation, Charging mode, Trickle Charging mode, and OTG mode. Figure 3, which is the top view of the evaluation board, highlights the key testing points and connection terminals. For other modes or more information about ISL9237, please refer to the ISL9237 datasheet. System Voltage Regulation 1. Set the power supply to 5V and, with the output disabled, connect the (+) to J1 and the (-) end to J2. 2. Ensure jumpers JP3, JP4, and JP6 are shorted. SW1 and SW2 should switch to the low position. 3. Turn on the power supply, measure VSYS using the DMM across (+) and (-) TP5. VSYS should read 8.38V. The current meter on the supply should read