DATASHEET NOT RECOMMENDED FOR NEW DESIGNS RECOMMENDED REPLACEMENT PART ISL9238 ISL9237 FN8723 Rev.5.00 Buck-Boost Narrow VDC Battery Charger with SMBus Interface and USB OTG Nov 29, 2017 The ISL9237 is a buck-boost Narrow Output Voltage DC (NVDC) Features charger utilizing Intersils advanced R3 Technology to provide Buck-boost NVDC charger for 1-, 2- or 3-cell Li-ion batteries high light-load efficiency, fast transient response and seamless DCM/CCM transitions for a variety of mobile and Input voltage range 3.2V to 23.4V (no dead zone) industrial applications. System output voltage 2.4V to 13.824V In Charge mode, the ISL9237 takes input power from a wide System power monitor PSYS output, IMVP-8 compliant range of DC power sources (conventional AC/DC charger Up to 1MHz switching frequency adapters, USB PD ports, travel adapters, etc.) and safely charges battery packs with up to 3 cells in a series LDO output for charger VDD configuration. Adapter current monitor (AMON) ISL9237 supports On-the-Go (OTG) function for 2- and 3-cell Battery discharging current monitor (BMON) battery applications. When OTG function is enabled, the PROCHOT open-drain output, IMVP-8 compliant ISL9237 operates in the reverse Buck mode to provide 5V at the USB port. Allows trickle charging of depleted battery Optional ASGATE FET control As a NVDC topology charger, it also regulates the system output to a narrow DC range for stable system bus voltage. The Ideal diode control in Turbo mode system power can be provided from the adapter, battery or a Supports OTG function for 2- and 3-cell batteries combination of both. The ISL9237 can operate with only a 2 SMBus and auto-increment I C compatible battery, only an adapter or both connected. For Intel IMVP8 compliant systems, the ISL9237 includes PSYS functionality, Two-level adapter current limit available which provides an analog signal representing total platform Pb-free (RoHS compliant) power. The PSYS output will connect to a wide range of Intersil IMVP8 core regulators to provide an IMVP8 compliant power Package 4x4 32 Ld QFN domain function. Applications 2 The ISL9237 has serial communication via SMBus/I C that Mobile devices with rechargeable batteries allows programming of many critical parameters to deliver a customized solution. These programming parameters include, Industrial devices with rechargeable batteries but are not limited to: Adapter current limit, charger current limit, system voltage setting and trickle charging current limit. Related Literature For a full list of related documents please visit our web page - ISL9237 product page OPTIONAL VADP R s1 VSYS Q1 Q4 L1 Q3 Q2 VSYS CSIN CSOP CSIP R s2 ASGATE CSON ADP ACIN ISL9237 ACOK GND BGATE PROCHOT AMON/BMON V VBAT BAT BATGONE OTGPG/CMOUT OTGEN/CMIN FIGURE 1. TYPICAL APPLICATION CIRCUIT FN8723 Rev.5.00 Page 1 of 40 Nov 29, 2017 SCL UGATE1 LGATE1 SDA COMP BOOT1 PROG PHASE1 PSYS PHASE2 DCIN BOOT2 VDD LGATE2 VDDP UGATE2ISL9237 Table of Contents Ordering Information 3 Pin Configuration 3 Pin Descriptions . 3 Simplified Application Circuit . 5 Absolute Maximum Ratings . 6 Thermal Information . 6 Recommended Operating Conditions 6 Electrical Specifications . 6 SMBUS Timing Specification . 10 Typical Performance 12 Data Validity 16 START and STOP Conditions . 16 Acknowledge . 16 SMBus Transactions . 16 Byte Format 16 2 SMBus and I C Compatibility 17 ISL9237 SMBus Commands 17 Setting Charging Current Limit . 18 Setting Adapter Current Limit 18 Setting Two-Level Adapter Current Limit Duration 19 Setting Maximum Charging Voltage or System Regulating Voltage 20 Setting Minimum System Voltage 20 Setting PROCHOT Threshold for Adapter Overcurrent Condition . 20 Setting PROCHOT Threshold for Battery Over Discharging Current Condition . 21 Setting PROCHOT Debounce Time and Duration Time 21 Control Registers 21 OTGVoltage Register . 24 OTGCurrent Register . 25 Information Register . 25 Application Information . 26 R3 Modulator . 26 ISL9237 Buck-Boost Charger with USB OTG . 27 Soft-Start . 28 Programming Charger Option . 28 DE Operation . 29 Power Source Selection 29 Battery Learn Mode 29 Turbo Mode Support . 30 Two-Level Adapter Current Limit . 30 Current Monitor . 30 PSYS Monitor . 30 Trickle Charging . 31 System Voltage Regulation . 31 Charger Timeout 31 USB OTG (On-the-Go) . 31 Stand-Alone Comparator . 31 System Overvoltage Protection 33 Way Overcurrent Protection (WOCP) 33 Over-Temperature Protection 33 Switching Power MOSFET Gate Capacitance . 33 Adapter Input Filter 33 Select the LC Output Filter 34 Select the Input Capacitor 34 Layout Guidelines 37 Revision History 39 About Intersil 39 Package Outline Drawing 40 FN8723 Rev.5.00 Page 2 of 40 Nov 29, 2017