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Renesas ISL6298-2CR4Z-T
- Part No.:
- ISL6298-2CR4Z-T
- Manufacturer:
- Renesas
- Category:
- Battery Chargers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL6298-2CR4Z-T.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
ISL6298-2CR4Z-T from Renesas (formerly Intersil) is a thermally enhanced 16-lead 4×4 mm QFN linear Li-ion/Li-polymer battery charger IC for single-cell applications. It delivers programmable constant-current up to 450 mA, maintains ±1% voltage regulation at 4.20 V, supports NTC-based temperature monitoring, and implements thermal foldback for safe operation in space-constrained PCBs - used in Bluetooth headsets, MP3 players, and portable medical instruments.
For engineers reviewing the ISL6298-2CR4Z-T datasheet, ISL6298-2CR4Z-T pinout, ISL6298-2CR4Z-T application, or ISL6298-2CR4Z-T equivalent, this page provides verified technical context, validated pin functions, confirmed CC/CV charging behavior, real-world thermal foldback thresholds, and two field-validated alternative parts with documented functional differences.
Technical Context
The ISL6298-2CR4Z-T implements a fully integrated CC/CV charge algorithm with internal pass MOSFET and current-sense circuitry. Its 4.20 V ±1% regulated output voltage and programmable end-of-charge threshold (14–36 mA) are calibrated for ISL6298-2 variant compliance, distinct from the 4.10 V ISL6298 version. The device uses an internal oscillator (programmable via external CTIME capacitor) to control both fast-charge timeout and trickle-charge duration.
It features dual-stage thermal protection: preconditioning below 2.8 V (20% of CC current), followed by thermal foldback activation at 100°C (±15°C) with 25 mA/°C gain. The TEMP pin interfaces directly with an external NTC thermistor to enforce battery temperature window limits (VTMIN = 1.51 V, VTMAX = 0.38 V at V2P8 = 3.0 V), while V2P8 provides a stable 2.8 V reference for biasing external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20 V ±1% - ensures full capacity without overvoltage stress on standard Li-ion cells. |
| Max Charge Current | 450 mA - programmable via IREF resistor; enables rapid charging of low-capacity batteries (e.g., 200–600 mAh). |
| End-of-Charge Threshold | 14–36 mA - user-set via IMIN resistor; triggers STATUS high when current drops below threshold during CV phase. |
| Thermal Foldback Start | 100°C ±15°C - initiates linear current reduction to prevent junction overheating in compact layouts. |
| Recharge Threshold | 4.0 V - resumes charging only after battery self-discharge drops below this level, preventing premature cycling. |
| Trickle Threshold | 2.8 V - activates 20% preconditioning current for deeply discharged cells, limiting duration to 1/8 of fast-charge time. |
| Operating Temp Range | −20°C to +70°C ambient - validated for consumer portable electronics operating environments. |
Pinout & Package
ISL6298-2CR4Z-T is housed in a thermally enhanced 16-lead 4×4 mm QFN package (JEDEC MO-220, pkg drawing L16.4x4) with exposed thermal pad. Pin 1 is marked by dot; top-side silkscreen reads "6298CR4Z".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 15, 16) | Input power supply | Accepts 4.3–6.5 V wall adapter input; multiple pins reduce trace resistance and improve thermal conduction. |
| FAULT (Pin 2) | Open-drain fault indicator | Pulled LOW on TIMEOUT, over/under-temp, or battery removal; requires external pull-up to V2P8 or VIN. |
| STATUS (Pin 3) | Open-drain charge status | Pulled LOW during active charging; goes HIGH and latches upon EOC condition until next charge cycle. |
| TIME (Pin 4) | Oscillator timing node | Connects to CTIME capacitor (e.g., 15 nF → 3.0 ms period → 3.5 hr timeout); sets all internal timing intervals. |
| GND (Pin 5) | System ground reference | Primary return path for charge current and logic; must be tied to exposed thermal pad for optimal θJC = 4°C/W. |
| TOEN (Pin 6) | Timeout enable control | Pull LOW to disable fast-charge timer; floating or HIGH enables safety timeout - unique to QFN variant. |
| EN (Pin 7) | Enable logic input | Open-drain compatible; floating = enabled, grounded = shutdown (<30 µA VIN current, <3 µA battery leakage). |
| V2P8 (Pin 8) | 2.8 V reference output | Stable rail for NTC biasing and external pull-ups; max 2 mA load; decouple with 1 µF ceramic capacitor. |
| IREF (Pin 9) | Constant-current programming | Sets CC current via external resistor (e.g., 80 kΩ → 250 mA); internal 0.8 V reference enables precise scaling. |
| IMIN (Pin 10) | End-of-charge current setting | Resistor-to-GND configures IEOC (e.g., 80 kΩ → 25 mA); not available on DFN variant. |
| TEMP (Pin 11) | NTC thermistor interface | Monitors battery pack temperature via voltage divider; detects removal (VRMV = 2.25 V) and enforces VTMIN/VTMAX windows. |
| VBAT (Pins 12, 13, 14) | Battery connection | Direct connection to cell anode; multiple pins lower impedance and improve thermal dissipation from internal FET. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated pass MOSFET + current sense | Eliminates need for external blocking diode or sense resistor; reduces BOM count and layout area. |
| Programmable safety timer | Configurable fast-charge timeout (e.g., 15 nF → 3.5 hrs) prevents indefinite charging of faulty batteries. |
| NTC thermistor interface with hysteresis | Supports battery temperature monitoring across −20°C to +70°C using standard NTCs; includes 220 mV low-temp and 60 mV high-temp hysteresis. |
| Preconditioning mode | Automatically applies 20% of CC current below 2.8 V with 1/8 timeout limit - safeguards deeply discharged Li-ion cells. |
| Charge current thermal foldback | Reduces current linearly above 100°C (25 mA/°C) to maintain safe junction temperature without external thermal sensors. |
Applications
| Bluetooth Headset Charging | MP3 Player Battery Management |
|---|---|
Use Scenario: Compact wearable audio device with 300 mAh Li-polymer battery requiring safe, low-heat charging from USB-powered adapter. IC Role / Device Role / Timing Role: Linear charger IC managing CC/CV profile, thermal foldback, and NTC-based temperature supervision during daily top-up cycles. Use Value: Enables 450 mA charge rate within tight thermal envelope; 4.20 V regulation ensures full capacity without cell degradation. |
Use Scenario: Portable music player with removable battery pack needing automatic recharge detection and fault-safe termination. IC Role / Device Role / Timing Role: Single-chip battery management unit providing recharge threshold detection (4.0 V), STATUS-driven LED indication, and TIMEOUT-limited fast charge. Use Value: Eliminates microcontroller intervention for basic charging control; STATUS latch simplifies host firmware polling. |
| Medical Sensor Patch | Smart Remote Control |
Use Scenario: Disposable wearable patch with 150 mAh Li-ion cell, requiring ultra-low standby current and reliable temperature-aware charging. IC Role / Device Role / Timing Role: Low-quiescent charger IC delivering <3 µA battery leakage in shutdown and enabling NTC-based ambient temperature validation before charge initiation. Use Value: Extends shelf life and operational runtime; V2P8 rail powers external NTC circuit without additional LDO. |
Use Scenario: IR remote with integrated rechargeable battery, needing adapter presence detection and robust fault handling during intermittent use. IC Role / Device Role / Timing Role: Adapter-aware charger IC using V2P8 as power-good signal and FAULT pin for open-circuit or over-temp alerts. Use Value: Prevents charging attempts with missing battery (via TEMP pin removal detection) and disables charging under unsafe thermal conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-cell Li-ion linear charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24040DSQR | Fixed 4.2 V output, no NTC interface, no programmable IEOC; integrates LDO for system power. | Lacks temperature monitoring and flexible end-of-charge threshold; better suited for cost-sensitive, non-temperature-critical designs. | Select BQ24040DSQR if NTC supervision is unnecessary and system power rail integration is preferred over discrete control. |
| TP4056 | Fixed 1 A max charge current, no thermal foldback, no programmable timeout, no V2P8 reference output. | Requires external components for temperature sensing and lacks adaptive thermal protection; widely used but less robust in thermally constrained layouts. | Choose TP4056 only for simple, high-volume applications where thermal margin is ample and design simplicity outweighs safety features. |
Compared with BQ24040DSQR and TP4056, the ISL6298-2CR4Z-T offers superior thermal safety via foldback, precise NTC interfacing, and independent configuration of voltage, current, and timing - making it suitable for compact, temperature-sensitive portable devices where reliability is critical.
Availability
ISL6298-2CR4Z-T is available at Aetrix Electronics and suitable for Bluetooth headset charging, MP3 player battery management, and medical sensor patch applications requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for ISL6298-2CR4Z-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics Corporation (acquired Intersil in 2017) is a global semiconductor leader specializing in microcontrollers, analog power, and mixed-signal solutions for industrial, automotive, and consumer markets.
The ISL6298-2CR4Z-T belongs to Renesas' legacy battery management IC portfolio, designed specifically for low-power, space-constrained portable electronics requiring high-accuracy linear charging with integrated safety features.
FAQ
What is the exact charge voltage accuracy and tolerance of the ISL6298-2CR4Z-T?
The ISL6298-2CR4Z-T delivers a nominal 4.20 V output with ±1% accuracy over temperature and line regulation - meaning the actual regulated voltage remains between 4.158 V and 4.242 V across its full operating range. This precision ensures optimal Li-ion cell longevity and capacity utilization without risk of overvoltage stress, and is specific to the ISL6298-2 variant (distinct from the 4.10 V ISL6298 version).
How does the ISL6298-2CR4Z-T handle thermal overload during charging?
The ISL6298-2CR4Z-T implements charge current thermal foldback starting at 100°C ±15°C, reducing current at 25 mA/°C to maintain safe junction temperature. Unlike simple shutdown, this feature allows continued charging at reduced rate while dissipating heat - critical for compact PCBs with limited copper area. The foldback behavior is internally calibrated and requires no external components, and is fully documented in the FN9173 datasheet Figure 22.
Can the ISL6298-2CR4Z-T be used without an NTC thermistor?
Yes - the ISL6298-2CR4Z-T supports NTC-optional operation. When the TEMP pin is left unconnected or tied to V2P8, the device disables temperature monitoring but retains full charging functionality. However, battery removal detection is lost, and over/under-temperature faults will not trigger. For non-temperature-critical applications like basic remote controls, this configuration is valid and commonly implemented per Figure 18 in the datasheet.
What is the function of the TOEN pin on the ISL6298-2CR4Z-T, and how does it differ from the DFN variant?
The TOEN (Timeout Enable) pin on the ISL6298-2CR4Z-T allows disabling the fast-charge safety timer by pulling it LOW; floating or HIGH enables the timeout. This pin is exclusive to the 16-lead QFN package (ISL6298-2CR4Z-T) - the 10-lead DFN variant (e.g., ISL6298-2CR3Z-T) has TOEN internally floated and thus cannot disable the timer. This distinction is explicitly stated in the Pin Description section of FN9173 Rev 4.00.
Does the ISL6298-2CR4Z-T support automatic recharge, and what is the threshold voltage?
Yes - the ISL6298-2CR4Z-T automatically reinitiates charging when the battery voltage drops to the recharge threshold of 4.0 V (specific to the ISL6298-2 variant). This value is guaranteed and distinct from the 3.9 V threshold of the base ISL6298. Recharge occurs only after full termination and is subject to the same safety checks (e.g., TEMP pin integrity, POR reset), ensuring safe top-up cycles without user intervention.
ISL6298-2CR4Z-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 450mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6.5V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
ISL6298-2CR4Z-T FAQ
1.How can I place an order for ISL6298-2CR4Z-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6298-2CR4Z-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL6298-2CR4Z-T reliable?
The price and inventory of ISL6298-2CR4Z-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6298-2CR4Z-T is usually 5 days.
3.What payment methods are accepted for ISL6298-2CR4Z-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6298-2CR4Z-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6298-2CR4Z-T?
ISL6298-2CR4Z-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6298-2CR4Z-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL6298-2CR4Z-T?
For technical support, including ISL6298-2CR4Z-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6298-2CR4Z-T requirements.
6.How does Aetrix verify that ISL6298-2CR4Z-T is sourced from the original manufacturer or authorized distributors?
All ISL6298-2CR4Z-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL6298-2CR4Z-T meets industry standards.
7.What is the process for return or replacement of ISL6298-2CR4Z-T?
All ISL6298-2CR4Z-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6298-2CR4Z-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL6298-2CR4Z-T part is unused and in its original packaging.
Return procedure for ISL6298-2CR4Z-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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