Renesas ISL9241, Application Note

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Application Note
R16AN0002EU0300 Rev.3.00 Page 1
Jan 6, 2022 © 2018 Renesas Electronics
Abstract
The ISL9241 is a Buck-Boost battery charger that supports Narrow Voltage Direct Charging (NVDC) and Hybrid
Power Buck-Boost (HPBB/Bypass) operation modes. It also has special features such as Supplemental mode
(Intel Vmin Active Protection), USB On-the-Go (OTG), and USB PD operation modes (by operating the charger in
reverse direction). All modes are configurable by firmware. This document explains how to configure the ISL9241
to operate and transition between the different modes through SMBus and I
2
C communication.
Contents
1. ISL9241 Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Narrow Voltage Direct Charging (NVDC) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1.1
NVDC Turbo Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Bypass Mode with Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Reverse Turbo Boost (RTB) Mode with Battery Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Battery Only Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Supplemental Mode (Intel VAP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Transitioning Between Modes (NVDC/Bypass/RTB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Transitioning from NVDC or NVDC + CHRG to Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Transitioning from Bypass to NVDC or NVDC + CHRG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Transitioning to Charging and Reverse Turbo Boost (RTB) States . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Adapter Removal Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.5 Calculating Wait Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.1 Calculating
Time to Charge VSYS Node Before Turning on Bypass Gate . . . . . . . . . . . . . 14
2.5.2 Calculating Wait Time to Allow CSOP to Discharge to VBAT . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.3 Calculating Time to Charge VSYS Node Before Turning on NGATE . . . . . . . . . . . . . . . . . 14
3. Transitioning to OTG Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4. Transitioning to Supplemental Mode (Intel VAP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Entering Supplemental Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Calculating Charge Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 Discharging Input Capacitor Before Plugging in Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
ISL9241 Operation Modes