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Renesas ISL6292-2CR4
- Part No.:
- ISL6292-2CR4
- Manufacturer:
- Renesas
- Category:
- Battery Chargers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL6292-2CR4.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,825
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Product details
Overview
ISL6292-2CR4 from Renesas Electronics is a single-cell Li-ion/Li-polymer linear battery charger IC with 4.20V ±1% charge voltage regulation, programmable up to 2A constant current (via IREF pin or external resistor), thermal foldback protection, NTC-based temperature monitoring, and integrated pass FET - designed for USB-powered or wall-adapter-powered handheld devices including medical handhelds, smartphones, and portable instruments.
For engineers reviewing the ISL6292-2CR4 datasheet, ISL6292-2CR4 pinout, ISL6292-2CR4 application, or ISL6292-2CR4 equivalent, this page delivers verified package mapping (16-lead 4×4 QFN), confirmed CC/CV charging behavior, exact VRECHRG = 4.0V threshold, thermal foldback activation at 100°C, and real-world design implications of TIMEOUT disable via TOEN pin.
Technical Context
The ISL6292-2CR4 operates as a linear charger with integrated main and sense MOSFETs in 100,000:1 current mirror configuration, enabling precise CC/CV regulation. Its charge voltage is fixed at 4.20V (±1%) for ISL6292-2 variants, and end-of-charge detection uses user-programmable IMIN threshold (85–135mA with RIMIN = 80kΩ) or internal 1/10×IREF scaling.
It supports dual-input operation modes: voltage-source adapters (full linear regulation) and current-limited adapters (MOSFET saturation mode reducing power dissipation per Eq. 2). Thermal foldback begins at +100°C (TFOLD = 85–115°C), with gain GFOLD = 100mA/°C, and the 4×4 QFN package delivers θJA = 41°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.20V ±1% - ensures full capacity without overvoltage stress on single-cell Li-ion batteries. |
| Max Charge Current | 2A - programmable via IREF pin or RIREF resistor; enables fast charging in space-constrained portable designs. |
| Recharge Threshold | 4.0V - triggers automatic recharge when battery voltage drops below this level post-full-charge. |
| Thermal Foldback Start | 100°C - reduces charge current above this junction temperature to prevent thermal runaway on compact PCBs. |
| Input Voltage Range | 4.3V to 6.5V - compatible with standard 5V USB and 5V wall adapters; POR ensures operation down to 2.65V after startup. |
| Package | 16-lead 4×4 mm QFN - thermally enhanced layout with exposed pad; θJC = 4°C/W for efficient heat transfer. |
| NTC Interface | Voltage-based TEMP pin - monitors battery temperature using external NTC thermistor; detects removal and enforces safe charging range. |
Pinout & Package
ISL6292-2CR4 is housed in a RoHS-compliant 16-lead 4×4 mm QFN package (PKG DWG L16.4x4) with exposed thermal pad. Pin functions are validated per FN9105 Rev.10.00, Page 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,15,16) | Main input power supply | Accepts 4.3–6.5V adapter or USB source; multiple pins reduce trace resistance and improve thermal path. |
| FAULT (Pin 2) | Open-drain fault indicator | Pulled LOW on battery removal, over-temperature, or TIMEOUT fault; requires external pull-up for system-level alerting. |
| STATUS (Pin 3) | Open-drain charge status | Pulled LOW during active charging; HIGH and latched at EOC; used for LED or host MCU status polling. |
| TIME (Pin 4) | Oscillator timing node | Connects to CTIME capacitor (e.g., 15nF → 3.0ms period); sets TIMEOUT (3.5h) and trickle-mode duration (1/8 TIMEOUT). |
| GND (Pin 5) | System ground reference | Primary return path for VIN, VBAT, and internal circuits; must be low-impedance connection to thermal pad. |
| TOEN (Pin 6) | Timeout enable control | Pulled LOW disables fast-charge TIMEOUT limit; leaves charger in continuous CV mode (LDO-like behavior). |
| EN (Pin 7) | Enable logic input | Floating = enabled; tied LOW = shutdown (ISTANDBY ≤ 3.0µA); used for host-controlled charge initiation. |
| V2P8 (Pin 8) | 2.8V reference output | Indicates adapter presence (active above POR); sources 2mA; usable for biasing external circuits or NTC divider. |
| IREF (Pin 9) | Charge current programming | Sets ICHARGE via resistor (e.g., 80kΩ → 1.0A) or logic voltage (≥1.2V → 450mA; ≤0.4V → ≤100mA). |
| IMIN (Pin 10) | End-of-charge current setting | Programmed by RIMIN (e.g., 80kΩ → 110mA typical) or tied to V2P8 for 1/10×IREF; determines STATUS transition point. |
| TEMP (Pin 11) | NTC thermistor interface | Monitors battery temperature via voltage divider; also detects battery removal by open-circuit condition. |
| VBAT (Pins 12,13,14) | Battery terminal connection | Direct connection to cell anode; multiple pins lower impedance and improve thermal conduction to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Pass FET + Current Sense | Eliminates need for external MOSFET and sense resistor; reduces BOM count and layout area in portable designs. |
| No External Blocking Diode | Internal architecture prevents reverse current flow from battery to input; simplifies power path and improves efficiency. |
| Programmable Trickle Mode | Preconditions deeply discharged batteries (<2.8V) at 10% IREF for ≥15 oscillator cycles before CC mode entry. |
| Adapter-Agnostic Operation | Supports both voltage-source (linear regulation) and current-limited (saturation-mode) adapters - minimizes thermal design dependency. |
| Thermally Enhanced QFN | 4×4 mm package with exposed pad achieves θJA = 41°C/W - enables 2A charging without heatsink in handheld form factors. |
Applications
| Medical Handheld Devices | Smartphones & Feature Phones |
|---|---|
|
Use Scenario: Portable ultrasound, glucose meters, and infusion pumps requiring reliable, compact, and safety-certified battery charging. IC Role / Device Role / Timing Role: Primary Li-ion charger IC managing CC/CV profile, NTC-based thermal safety, and automatic recharge. Use Value: 1% VCH accuracy and 4.0V VRECHRG ensure battery longevity and compliance with medical device safety standards (IEC 62368-1). |
Use Scenario: Consumer smartphones with USB-C or proprietary wall adapters where board space and thermal budget are constrained. IC Role / Device Role / Timing Role: Standalone linear charger handling adapter detection (via V2P8), charge state indication (STATUS/FAULT), and timeout management. Use Value: TOEN pin allows disabling TIMEOUT for legacy adapter compatibility; thermal foldback prevents overheating during rapid charging. |
| USB-Powered Portable Instruments | Self-Charging Battery Packs |
|
Use Scenario: Handheld multimeters, spectrum analyzers, and portable oscilloscopes powered directly from USB hosts or hubs. IC Role / Device Role / Timing Role: USB bus-powered charger supporting 500mA (USB2) and 900mA (USB3) current limits with automatic current scaling. Use Value: IREF pin logic-level programming (≥1.2V → 450mA) enables direct MCU GPIO control without external DAC or resistor network. |
Use Scenario: Swappable smart battery packs for drones, power tools, or robotics that self-manage charging without host intervention. IC Role / Device Role / Timing Role: Autonomous charger IC with preconditioning, temperature monitoring, and automatic recharge triggered by voltage decay. Use Value: IMIN pin programmability (85–135mA) allows tuning end-of-charge sensitivity to match pack aging characteristics over lifecycle. |
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 |
|---|---|---|---|
| BQ24075RGTR | Fixed 4.2V charge voltage, 1.5A max, no TOEN pin, integrated LDO output (VOUT), different NTC interface (current-sink vs voltage-divider). | Lacks TIMEOUT disable capability and thermal foldback slope control; better suited for cost-sensitive, non-thermal-critical applications. | Select BQ24075RGTR only if VOUT rail generation is required and TOEN flexibility is unnecessary. |
| MP2617GQ-Z | 4.2V ±0.5% accuracy, 2A max, no IMIN pin (fixed 10% ICHARGE EOC), no TOEN, higher quiescent current (25µA vs 1µA in shutdown). | Missing programmable end-of-charge threshold and adapter-type flexibility; optimized for high-volume consumer electronics with simpler firmware. | Choose MP2617GQ-Z when absolute lowest BOM cost is prioritized over thermal adaptability and precision EOC tuning. |
Compared with BQ24075RGTR and MP2617GQ-Z, the ISL6292-2CR4 uniquely combines 1% VCH accuracy, TOEN-enabled TIMEOUT disable, and programmable IMIN/ICHARGE - making it optimal for thermally demanding, field-upgradable, or safety-critical portable systems.
Availability
ISL6292-2CR4 is available at Aetrix Electronics and suitable for medical handhelds, smartphones, USB-powered test equipment, and self-charging battery packs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6292-2CR4 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 is a global semiconductor leader delivering high-performance analog, power, and embedded processing solutions for industrial, automotive, and consumer markets.
The ISL6292 product line targets portable battery-powered systems requiring robust, thermally adaptive, and safety-certifiable Li-ion charging - with variants optimized for DFN, 4×4 QFN, and 5×5 QFN footprints.
FAQ
What is the exact charge voltage accuracy and tolerance for ISL6292-2CR4?
The ISL6292-2CR4 provides a nominal charge voltage of 4.20V with guaranteed ±1% accuracy across the full operating temperature range (-20°C to +70°C) and input voltage range (4.3V to 6.5V), as specified in the Electrical Specifications table on page 6 of FN9105 Rev.10.00. This tight tolerance ensures consistent full-charge capacity and extended cycle life for single-cell Li-ion batteries. The ISL6292-2CR4 achieves this via laser-trimmed internal references and matched transistor ratios in its charge regulation loop.
How does ISL6292-2CR4 handle current-limited adapters versus voltage-source adapters?
The ISL6292-2CR4 dynamically adapts: with voltage-source adapters, it operates as a linear regulator maintaining precise CC/CV; with current-limited adapters, its main MOSFET saturates (becoming a switch), reducing power dissipation per Equation 2 in the datasheet. This dual-mode behavior is intrinsic to the ISL6292-2CR4's current-mirror architecture and requires no external configuration. Critical design guidance - such as programming IREF ≥ 30% above adapter limit - is provided in the Applications Information section (page 13).
What happens when the TOEN pin is pulled low on ISL6292-2CR4?
Pulling TOEN low disables the TIMEOUT limit for fast-charge (CC/CV) modes, causing the ISL6292-2CR4 to operate indefinitely in CV regulation once VCH is reached - effectively functioning as a current-limited LDO. However, the trickle-mode timeout (1/8 TIMEOUT) remains active and cannot be disabled. This behavior is explicitly documented in the Theory of Operation section (page 13) and enables safe charging with legacy or non-standard adapters that lack strict current limiting.
Can ISL6292-2CR4 be used without an external NTC thermistor?
Yes - the ISL6292-2CR4 can operate without an NTC thermistor by leaving the TEMP pin unconnected or tying it to GND, but doing so disables battery temperature monitoring and removal detection. In such configurations, the ISL6292-2CR4 will still perform CC/CV charging and thermal foldback, but safety-critical thermal protection is forfeited. The datasheet explicitly warns against omitting NTC in medical or high-reliability applications, and the ISL6292-2CR4's TEMP pin voltage thresholds (VTMIN, VTMAX) are defined assuming proper NTC biasing from V2P8.
What is the minimum input voltage required for ISL6292-2CR4 to start and sustain charging?
The ISL6292-2CR4 has a Power-On Reset (POR) rising threshold of 3.4V (typical) and a falling threshold of 2.4V (min), ensuring reliable startup with 5V adapters. Crucially, once started, it sustains operation down to 2.65V (guaranteed), enabling continued charging even with sagging or current-limited USB sources. This 2.65V specification is explicitly guaranteed in the Electrical Specifications table (page 6) and is a key differentiator for USB bus-powered applications where input voltage droop is common.
ISL6292-2CR4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6.5V
- Interface:
- USB
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
ISL6292-2CR4 FAQ
1.How can I place an order for ISL6292-2CR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6292-2CR4 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 ISL6292-2CR4 reliable?
The price and inventory of ISL6292-2CR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6292-2CR4 is usually 5 days.
3.What payment methods are accepted for ISL6292-2CR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6292-2CR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6292-2CR4?
ISL6292-2CR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6292-2CR4 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 ISL6292-2CR4?
For technical support, including ISL6292-2CR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6292-2CR4 requirements.
6.How does Aetrix verify that ISL6292-2CR4 is sourced from the original manufacturer or authorized distributors?
All ISL6292-2CR4 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 ISL6292-2CR4 meets industry standards.
7.What is the process for return or replacement of ISL6292-2CR4?
All ISL6292-2CR4 units undergo pre-shipment inspection (PSI). If there is an issue with ISL6292-2CR4, 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 ISL6292-2CR4 part is unused and in its original packaging.
Return procedure for ISL6292-2CR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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