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Renesas ISL6256AHAZ-T
- Part No.:
- ISL6256AHAZ-T
- Manufacturer:
- Renesas
- Category:
- Battery Chargers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6256AHAZ-T.pdf
- Description:
- IC BATT CHG LI-ION 2-4CEL 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,323
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Product details
Overview
ISL6256AHAZ-T from Renesas Electronics (formerly Intersil) is a highly integrated synchronous buck battery charger controller for Li-ion/Li-polymer packs in notebook computers. It delivers ±0.5% charge voltage accuracy across -10°C to +100°C, supports 2–4-cell configurations up to 17.64V, and features automatic AC/battery power source selection with <10µA battery leakage current.
For engineers reviewing the ISL6256AHAZ-T datasheet, ISL6256AHAZ-T pinout, ISL6256AHAZ-T application, or ISL6256AHAZ-T equivalent, key selection criteria include its ±3% adapter current limit accuracy, fixed 300kHz PWM operation with diode emulation at light load, aircraft power support via DCSET/DCPRN, and QSOP-28 package compatibility with thermal shutdown and overvoltage protection.
Technical Context
The ISL6256AHAZ-T implements a fixed-frequency (245–355kHz) current-mode PWM control architecture with feed-forward line regulation and adaptive dead-time management between UGATE and LGATE. Its dual current loops regulate both battery charge current (via CSOP/CSON and CHLIM) and adapter input current (via CSIP/CSIN and ACLIM), while the voltage loop (CSON/VCOMP) maintains precise cell voltage setpoints.
Power source selection is handled by dedicated gate drivers: SGATE controls an external P-MOSFET for AC adapter path switching, and BGATE drives a second P-MOSFET for battery path selection. The IC integrates a 5V LDO (VDD), reference (VREF = 2.39V), and analog monitoring outputs (ICM, ACPRN, DCPRN) - all operating within a 7–25V DCIN range and -10°C to +100°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage Accuracy | ±0.5% over -10°C to +100°C - ensures reliable Li-ion cell voltage regulation without drift-induced capacity loss or safety risk. |
| Adapter Current Limit Accuracy | ±3% - enables precise AC adapter power utilization and prevents overload during simultaneous system load + charging. |
| Battery Charge Current Limit Accuracy | ±3% - guarantees consistent CC/CV charging profile adherence across temperature and unit variation. |
| Input Voltage Range | 7V to 25V - supports universal AC adapters and aircraft DC power (e.g., 15V) without external pre-regulation. |
| Switching Frequency | 300kHz nominal (245–355kHz range) - balances EMI, efficiency, and inductor size for portable computing applications. |
| Battery Cell Support | 2-, 3-, or 4-series Li-ion/Li-polymer - selected via CELLS pin logic (VDD/GND/float), enabling single BOM for multiple platform configurations. |
| Battery Leakage Current | <10µA - minimizes self-discharge when system is off, critical for long shelf life and standby battery retention. |
Pinout & Package
ISL6256AHAZ-T is housed in a 28-lead QSOP package (M28.15), with exposed pad not present. Thermal resistance θJA = 80°C/W. Pin functions are validated per FN6499 Rev 3.00, Page 12 (Functional Pin Descriptions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE | AC adapter power path driver | Drives external P-MOSFET to connect/disconnect AC adapter; enables automatic source selection on insertion/removal. |
| BGATE | Battery power path driver | Drives external P-MOSFET to select battery as system supply when AC adapter is absent or insufficient. |
| CHLIM | Battery charge current limit set | Analog input (0.1–3.6V) that sets full-scale CSOP–CSON sense voltage (e.g., 165mV at 3.3V); determines max charge current. |
| ACLIM | Adapter input current limit set | Selects adapter current threshold (50/75/100mV) via VREF/floating/GND; prevents AC adapter overload under heavy system load. |
| VADJ | Battery regulation voltage trim | Adjusts CSON setpoint from 4.2V −5% to +5% per cell (e.g., 3.99V–4.41V/cell) using VREF/GND/float configuration. |
| CELLS | Battery pack topology selector | Configures 2S (float), 3S (GND), or 4S (VDD) operation - directly maps to physical cell count without firmware change. |
| ACPRN / DCPRN | Open-drain presence indicators | ACPRN asserts low when AC adapter detected (ACSET >1.26V); DCPRN does same for DC adapter (DCSET >1.26V). |
| ICM | Adapter current monitor output | Voltage output proportional to adapter current (VICM = 19.9 × (VCSIP−VCSIN)); used for host MCU telemetry or fault logging. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with diode emulation | Maintains high efficiency (>92%) at light loads by disabling low-side MOSFET and enabling body-diode conduction - avoids reverse recovery losses. |
| Aircraft power support | Dual detection inputs (ACSET/DCSET) and outputs (ACPRN/DCPRN) allow safe operation with 15V aircraft DC without battery charging enabled. |
| Automatic power source selection | Seamless transition between AC adapter and battery without system interruption or brownout - critical for mobile computing uptime. |
| Thermal shutdown with hysteresis | Triggers at 150°C with 25°C hysteresis - protects IC and surrounding components during sustained high-power charging or poor PCB thermal design. |
| Pb-free RoHS-compliant packaging | QSOP-28 meets IPC/JEDEC J-STD-020 MSL requirements and supports both SnPb and Pb-free reflow profiles. |
Applications
| Notebook Power Management | Aircraft-Grade Portable Computing |
|---|---|
Use Scenario: Notebook computer with removable Li-ion battery and dual-input power (AC adapter + optional aircraft DC). IC Role / Device Role / Timing Role: Primary battery charger controller and automatic AC/battery power selector. Use Value: Enables hot-swap battery operation, prevents adapter overload during peak CPU/GPU load, and extends runtime via accurate CV charging. | Use Scenario: Ruggedized tablet used onboard commercial aircraft with 15V DC power only - no battery charging permitted. IC Role / Device Role / Timing Role: System power supervisor with DC adapter detection and battery isolation control. Use Value: Uses DCSET/DCPRN to detect aircraft power and disable charging while maintaining uninterrupted system operation from battery or DC input. |
| Sub-notebook Thermal-Constrained Design | PDA Battery Charging System |
Use Scenario: Fanless sub-notebook requiring minimal heat generation during overnight charging. IC Role / Device Role / Timing Role: High-efficiency synchronous buck charger with light-load diode emulation mode. Use Value: Achieves >92% efficiency at 10% load (Figure 7), reducing thermal stress on compact chassis and extending battery lifespan. | Use Scenario: Legacy PDA with 2-cell Li-polymer battery and microcontroller-based charging supervision. IC Role / Device Role / Timing Role: Integrated charger IC providing voltage/current regulation, cell count selection, and host telemetry via ICM. Use Value: Reduces BOM count by integrating current sensing, reference, LDO, and dual power-path control - simplifies layout and firmware integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6256HAZ-T | Base variant with identical pinout, package, and core functionality; differs in CHLIM/ACLIM current sense gain calibration (ISL6256 uses exact 50× formula vs ISL6256A's 49.72–50.28×). | No aircraft DC detection (lacks DCSET/DCPRN pins); limited to AC-only adapter environments. | Choose ISL6256HAZ-T for cost-sensitive AC-only notebooks where ±3% current limit tolerance is acceptable and aircraft compliance is unnecessary. |
| BQ24725ARHBT | TI part with 300kHz fixed-frequency buck, ±0.5% voltage accuracy, but uses SMBus interface for programmability and lacks native DC adapter detection logic. | Requires host MCU for configuration; no standalone DCSET/DCPRN support - unsuitable for aircraft without firmware extension. | Choose BQ24725ARHBT when SMBus-controlled dynamic parameter adjustment (e.g., real-time CHLIM update) is required and external MCU coordination is available. |
Compared with ISL6256HAZ-T and BQ24725ARHBT, the ISL6256AHAZ-T uniquely combines standalone aircraft DC detection, factory-trimmed current sense gain, and pin-compatible drop-in replacement for ISL6256AHRZ - making it optimal for thermally constrained, multi-adapter notebook platforms requiring zero-firmware power source arbitration.
Availability
ISL6256AHAZ-T is available at Aetrix Electronics and suitable for notebook computers, aircraft-grade portable devices, and sub-notebook power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for ISL6256AHAZ-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 is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.
The ISL6256AHAZ-T belongs to Renesas' high-integration battery management IC product line, designed specifically for space-constrained, thermally sensitive mobile computing platforms requiring autonomous AC/battery arbitration and precision Li-ion charging.
FAQ
What is the primary function of the ISL6256AHAZ-T in a notebook power system?
The ISL6256AHAZ-T serves as a fully integrated battery charger controller and automatic power source selector. It regulates Li-ion battery charging (CC/CV) with ±0.5% voltage accuracy, limits adapter and battery currents within ±3%, and autonomously switches between AC adapter and battery supplies - all without host MCU intervention. This ensures seamless operation during adapter insertion/removal and prevents system brownouts.
How does the ISL6256AHAZ-T support aircraft power applications?
The ISL6256AHAZ-T supports aircraft power via dedicated DCSET and DCPRN pins. When a 15V aircraft DC source is applied to DCSET, the IC asserts DCPRN low to signal presence and can be configured to disable battery charging while powering the system - meeting aviation safety requirements. This capability is absent in the base ISL6256HAZ-T variant.
What package type and thermal characteristics does the ISL6256AHAZ-T use?
The ISL6256AHAZ-T uses a 28-lead QSOP package (M28.15) with θJA = 80°C/W. It operates across -10°C to +100°C ambient and includes thermal shutdown at 150°C with 25°C hysteresis. Unlike the QFN variant (ISL6256AHRZ-T), the QSOP version lacks an exposed thermal pad, making it suitable for cost-optimized layouts where moderate power dissipation is expected.
Can the ISL6256AHAZ-T be used with 2-cell, 3-cell, and 4-cell Li-ion battery packs?
Yes, the ISL6256AHAZ-T supports 2-, 3-, and 4-cell Li-ion/Li-polymer packs via the CELLS pin: float for 2S, GND for 3S, and VDD for 4S. It delivers up to 17.64V output (4.2V × 4 cells) with ±0.5% accuracy, and allows ±5% per-cell voltage adjustment via VADJ - enabling optimization for capacity, longevity, or fast-charge trade-offs across platform variants.
What is the role of the CHLIM and ACLIM pins on the ISL6256AHAZ-T?
The CHLIM pin sets the battery charge current limit by defining the full-scale differential voltage across CSOP/CSON (e.g., 165mV at 3.3V). The ACLIM pin selects the AC adapter input current limit threshold (50/75/100mV) via connection to GND/floating/VREF. Both enable precise, resistor-programmable current regulation - critical for avoiding adapter overload and ensuring safe battery charging profiles in the ISL6256AHAZ-T.
ISL6256AHAZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2 ~ 4
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Temperature, Over Voltage, Short Circuit
- Charge Current - Max:
- 2.6A
- Battery Pack Voltage:
- 17.64V (Max)
- Voltage - Supply (Max):
- 25V
- Interface:
- -
- Operating Temperature:
- -10°C ~ 100°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP/QSOP
ISL6256AHAZ-T FAQ
1.How can I place an order for ISL6256AHAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6256AHAZ-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 ISL6256AHAZ-T reliable?
The price and inventory of ISL6256AHAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6256AHAZ-T is usually 5 days.
3.What payment methods are accepted for ISL6256AHAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6256AHAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6256AHAZ-T?
ISL6256AHAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6256AHAZ-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 ISL6256AHAZ-T?
For technical support, including ISL6256AHAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6256AHAZ-T requirements.
6.How does Aetrix verify that ISL6256AHAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6256AHAZ-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 ISL6256AHAZ-T meets industry standards.
7.What is the process for return or replacement of ISL6256AHAZ-T?
All ISL6256AHAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6256AHAZ-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 ISL6256AHAZ-T part is unused and in its original packaging.
Return procedure for ISL6256AHAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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