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ISL9241 Operation Modes
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
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
R16AN0002EU0300 Rev.3.00
Jan 6, 2022
Application Note
2
C communication.
© 2018 Renesas Electronics
Page 1
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Summary of Contents for Renesas ISL9241
-
Page 1: Table Of Contents
(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 C communication. -
Page 2: Isl9241 Operation Modes
When an adapter is plugged into the system, the ISL9241 starts up initially in NVDC mode and can be set up for other modes through firmware from a controller on the board. -
Page 3: Nvdc Turbo Mode
Bypass Mode with Battery Charging When the adapter voltage is higher than the battery voltage, the ISL9241 can be operated in Bypass mode. In Bypass mode, the adapter is connected directly to the system and the system power is provided directly from the adapter. -
Page 4: Reverse Turbo Boost (Rtb) Mode With Battery Charging
Reverse Turbo Boost (RTB) Mode with Battery Charging If the ISL9241 is configured to operate in Bypass mode, Reverse Turbo Boost (RTB) mode can be enabled. RTB mode is useful when the adapter alone cannot handle the peak power demands from the system. In RTB mode, the battery supplements the adapter power by operating the ISL9241 in the reverse direction. -
Page 5: Battery Only Mode
Battery Only mode is very high. Because the control loop and several features are not needed in Battery Only mode, these features can be turned off and the ISL9241 can operate in a low power state, consuming very little current for operation. -
Page 6: Supplemental Mode (Intel Vap)
Use this mode when there is only a battery in the system and the adapter port is open. When the battery voltage is high, the ISL9241 operates in reverse direction (OTG mode) and stores some energy from the battery in the input capacitors (on the adapter side) at high voltage. -
Page 7: Transitioning Between Modes (Nvdc/Bypass/Rtb)
Bypass State: Set up the system with the Bypass gates ON to make VSYS = VADP and allow flow of current from the adapter directly to the load. In this state, the adapter is connected directly to the system, but the ISL9241 is not switching, so the charging and reverse turbo boost functions are disabled. -
Page 8: Transitioning From Nvdc Or Nvdc + Chrg To Bypass
The output voltage of the ISL9241 is raised to the adapter voltage and the Bypass FETs are closed. When the system is connected to the adapter, NGATE is turned off to isolate the system from the output of the ISL9241. The ISL9241 output is then ramped down close to the battery voltage so that charging can be enabled safely any time. -
Page 9: Transitioning From Bypass To Nvdc Or Nvdc + Chrg
ISL9241 Adapter Current Limit value. After turning off the battery FET, the ISL9241 output is ramped up to the adapter voltage. The NGATE FET is closed, connecting the output of the ISL9241 to the system. The Bypass FETs then open, isolating the adapter and the system output. -
Page 10: Transitioning To Charging And Reverse Turbo Boost (Rtb) States
0x14 allow charging Transitioning to Charging and Reverse Turbo Boost (RTB) States When the ISL9241 has transitioned completely into Bypass mode (or NVDC mode), enable the charging and/or Reverse Turbo Boost (RTB) modes using the commands in Table Table 3. Transitioning Between Bypass Mode and Charging and Reverse Turbo Boost States... - Page 11 ISL9241 Operation Modes Application Note Table 3. Transitioning Between Bypass Mode and Charging and Reverse Turbo Boost States (Cont.) Step Value Register Transition From State To State Number Function Description Register Name (Decimal) Address Bypass Bypass+ Set MinSysVoltage to a...
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Page 12: Adapter Removal Events
ISL9241 Operation Modes Application Note Adapter Removal Events When the ISL9241 operates in NVDC mode, it can automatically detect adapter removal and operate in Battery Only mode independently. When the ISL9241 is in Bypass mode (with or without charging and Reverse Turbo... - Page 13 ISL9241 Operation Modes Application Note Table 4. Adapter Removal Events (Cont.) Step Value Register From State To State Number Function Description Register Name (Decimal) Address Monitor ACOK – complete the following steps before connecting another adapter Disable Force Forward Control 4...
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Page 14: Calculating Wait Time
VADP ILIM Renesas recommends setting the fixed wait time to twice the T value to account for approximations. Set the safe margin to around 1% of the VADP voltage avoid any gain errors that can cause the output to be higher than the set value. -
Page 15: Transitioning To Supplemental Mode (Intel Vap)
There are two options to discharge the input capacitor if an adapter plug in event is detected before the adapter is connected to the ISL9241 input (before closing the back to back FETs before the ISL9241). ▪ Control 0<15> lets the system controller discharge the input capacitor at any time using a 10mA internal current source on the CSIN pin ▪... -
Page 16: Revision History
ISL9241 Operation Modes Application Note Revision History Rev. Date Description 3.00 Jan 6, 2022 Applied new template. Removed Related Literature section. Updated Transitioning from NVDC or NVDC + CHRG to Bypass section. Updated Tables 1 and 2. 2.00 Jan 10, 2019 Changed the order of steps in the NVDC Mode to Bypass Mode steps. - Page 17 Renesas' products are provided only subject to Renesas' Terms and Conditions of Sale or other applicable terms agreed to in writing. No use of any Renesas resources expands or otherwise alters any applicable warranties or warranty disclaimers for these products.
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