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Renesas ISL95521BIRZ
- Part No.:
- ISL95521BIRZ
- Manufacturer:
- Renesas
- Category:
- Battery Chargers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL95521BIRZ.pdf
- Description:
- IC BATT CHG LI-ION 2-4CELL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,655
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Product details
Overview
ISL95521BIRZ from Renesas Electronics is a configurable Hybrid Power Boost (HPB) and Narrow VDC (NVDC) battery charger IC for 2–4-cell Li-ion systems, featuring SMBus interface, R3™ modulation, 32-pin 4mm×4mm QFN package, and hardware-based adapter/battery current limits.
For engineers reviewing the ISL95521BIRZ datasheet, ISL95521BIRZ pinout, ISL95521BIRZ application, or ISL95521BIRZ equivalent, this device supports Turbo mode system power augmentation, PROCHOT# signaling per Intel spec, high-accuracy current monitoring, and robust inrush control during battery removal-critical for ultrabook, 2-in-1, and mobile workstation power architectures.
Technical Context
The ISL95521BIRZ implements dual-mode operation: HPB mode reverse-boosts battery energy to VSYS during adapter overload, while NVDC mode rapidly enables BFET to parallel battery with adapter. Both modes rely on N-channel MOSFETs for all switching paths and use an internal charge pump for gate drive control.
It integrates Renesas' Robust Ripple Regulator (R3™) modulation for fast transient response and >90% light-load efficiency, plus dedicated hardware current limit comparators independent of SMBus programming-ensuring deterministic protection under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charger Modes | Configurable HPB or NVDC operation-enables flexible system-level power path design for Turbo mode load sharing. |
| Cell Support | 2-, 3-, or 4-cell Li-ion battery-matches common laptop and mobile platform battery configurations. |
| Switching Frequency | 350kHz to 1MHz (16 selectable options)-allows optimization of EMI, size, and efficiency across input/output conditions. |
| Current Monitoring | High-accuracy adapter & battery discharge current monitors with programmable sense resistor support-enables precise PSYS/PROCHOT# triggering and thermal management. |
| Package | 32-pin QFN, 4mm × 4mm, 0.5mm pitch-supports compact, thermally efficient layout in space-constrained mobile PCBs. |
| Interface | SMBus 2.0 + auto-increment I²C compatible-enables host CPU or EC to configure charging parameters and read status without custom firmware. |
| Protection Features | Hardware-based adapter/battery overcurrent limits + PROCHOT# assertion for system low voltage, adapter OC, battery OC, or overheating-provides fail-safe response independent of software. |
Pinout & Package
ISL95521BIRZ is housed in a 32-pin, 4mm × 4mm, 0.5mm pitch QFN package with exposed thermal pad (EP). Pin 1 marked by dot; EP soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VADP | Adapter Input Supply | Primary input rail-accepts wide-range DC adapter voltage; feeds internal regulators and power switches. |
| VBAT | Battery Input | Connects directly to battery pack; supports 2–4-cell Li-ion (up to ~17V); used for HPB reverse-boost and NVDC parallel sourcing. |
| VSYS | System Output Bus | Regulated system rail supplied jointly by adapter and/or battery; dynamically managed during Turbo mode transitions. |
| UGATE/LGATE/BGATE | NFET Gate Drivers | Drive external upper, lower, and battery FETs-charge-pump enabled for full enhancement of N-channel MOSFETs without external bias. |
| PROCHOT# | Open-Drain System Alert | Asserts low to signal host processor of critical conditions (system UV, adapter OC, battery OC, thermal shutdown) per Intel specification. |
| SCL/SDA | SMBus Interface | Two-wire bidirectional bus for configuration, telemetry, and status reporting; supports auto-increment addressing for efficient register access. |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid Power Boost (HPB) Mode | Enables battery-to-VSYS reverse boost during adapter overload-maintains system stability without brownout when adapter cannot meet peak load. |
| Narrow VDC (NVDC) Mode | Provides seamless battery-assisted system power via fast BFET turn-on-eliminates voltage droop during sudden adapter removal or load surge. |
| R3™ Modulation Scheme | Delivers >90% efficiency at 10mA load and <10µs load-step response-critical for dynamic CPU/GPU power states in thin-and-light platforms. |
| Hardware Current Limits | Dedicated analog comparators enforce adapter and battery current caps independently of SMBus-guarantees protection even during firmware hang or communication loss. |
| Active Inrush Control | Gradually ramps gate drive during startup and battery insertion-prevents voltage overshoot and NFET avalanche stress in high-capacitance VSYS systems. |
Applications
| Ultrabook Power Management | 2-in-1 Detachable Systems |
|---|---|
|
Use Scenario: Thin-and-light notebook requiring sustained 45W+ turbo performance while maintaining battery runtime and thermal headroom. IC Role / Device Role / Timing Role: Dual-mode charger manages adaptive power path between 65W adapter and 3-cell battery, enabling system-level Turbo mode with PROCHOT# coordination. Use Value: Eliminates need for oversized adapters by leveraging battery assist-reducing system weight and cost while meeting Intel PSYS/PROCHOT# compliance. |
Use Scenario: Detachable tablet with keyboard dock, where battery must seamlessly support both tablet-only and docked high-power modes. IC Role / Device Role / Timing Role: NVDC mode enables instant battery contribution upon dock connection; HPB mode sustains VSYS during hot-dock removal without system reset. Use Value: Prevents VSYS collapse during mechanical disconnection-ensures uninterrupted operation and data integrity during mode transitions. |
| Mobile Workstation Charging | Enterprise Tablet Docking Station |
|
Use Scenario: High-performance mobile workstation running CAD/VM workloads with aggressive thermal throttling and dynamic power budgets. IC Role / Device Role / Timing Role: Configured as HPB charger to reverse-boost battery into VSYS during CPU/GPU burst loads exceeding adapter rating. Use Value: Delivers up to 15W additional system power for <500ms bursts-extending sustained performance window without compromising battery longevity. |
Use Scenario: Enterprise tablet docked to USB-C hub delivering display, storage, and Ethernet-all drawing from single adapter + tablet battery. IC Role / Device Role / Timing Role: Monitors adapter and battery currents in real time; asserts PROCHOT# if combined load exceeds safe thermal envelope. Use Value: Enables intelligent thermal throttling coordinated across SoC, GPU, and dock peripherals-preventing localized overheating and system instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95521AIRZ | Same die, different SMBus address (0x14 vs 0x16); identical pinout, specs, and R3™ modulation. | No functional difference-used in multi-charger systems to avoid SMBus address conflict. | Select ISL95521AIRZ only when multiple ISL95521x devices share one SMBus bus; otherwise ISL95521BIRZ is default choice. |
| bq24780SRGER | TI part with fixed NVDC-only architecture; lacks HPB mode, R3™ modulation, and hardware adapter current limit-relies on SMBus for all protection thresholds. | Supports only 2–3-cell batteries; no reverse-boost capability; slower transient response due to conventional PWM control. | Choose bq24780SRGER only for cost-sensitive NVDC-only designs where HPB, PROCHOT# compliance, and hardware current limiting are not required. |
Compared with ISL95521AIRZ, ISL95521BIRZ offers standard SMBus address for single-device integration; versus bq24780SRGER, it delivers superior Turbo mode flexibility, faster dynamics, and deterministic hardware protection-making it optimal for Intel-platform ultrabooks and premium mobile workstations.
Availability
ISL95521BIRZ is available at Aetrix Electronics and suitable for ultrabook power management, 2-in-1 detachable systems, and mobile workstation charging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL95521BIRZ 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 specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and computing markets.
The ISL95521BIRZ belongs to Renesas' advanced battery charger IC product line, designed specifically for Intel-compliant mobile platforms requiring adaptive power path control, Turbo mode support, and robust system-level thermal/power coordination.
FAQ
What is the primary function of the ISL95521BIRZ in a laptop power architecture?
The ISL95521BIRZ serves as a dual-mode battery charger IC that dynamically manages power flow between the AC adapter and battery to supply the system rail (VSYS). It operates either as a Hybrid Power Boost (HPB) charger-reverse-boosting battery energy into VSYS-or as a Narrow VDC (NVDC) charger-enabling battery to parallel the adapter during peak loads. This ensures stable system operation during Turbo mode without brownout, while supporting Intel PROCHOT# and PSYS specifications. The ISL95521BIRZ is essential for modern ultrabooks and 2-in-1s where adapter size and battery runtime are tightly constrained.
Does the ISL95521BIRZ support both 3-cell and 4-cell Li-ion battery configurations?
Yes, the ISL95521BIRZ explicitly supports 2-, 3-, and 4-cell Li-ion battery packs, with voltage ranges up to ~17V for 4-cell operation. Its adaptive control loop and hardware current limits scale across these configurations without external component changes. The device's R3™ modulation maintains high efficiency and fast transient response regardless of cell count, and its SMBus interface allows host firmware to configure cell-specific parameters such as charge voltage and termination current. This flexibility makes the ISL95521BIRZ suitable for diverse mobile platforms-from mainstream laptops to high-end mobile workstations.
How does the ISL95521BIRZ implement PROCHOT# signaling, and what conditions trigger it?
The ISL95521BIRZ asserts the open-drain PROCHOT# signal in response to four hardware-monitored fault conditions: system bus undervoltage (VSYS < threshold), adapter overcurrent, battery overcurrent, or internal die overheating. These triggers are implemented using dedicated analog comparators-not SMBus-programmable thresholds-ensuring deterministic, low-latency response independent of firmware or communication status. The ISL95521BIRZ complies fully with Intel's PROCHOT# specification for mobile platforms, allowing direct integration with Intel CPUs and ECs for coordinated thermal and power throttling. This behavior is active in both HPB and NVDC modes.
What is the role of the R3™ modulation scheme in the ISL95521BIRZ?
The R3™ (Robust Ripple Regulator) modulation scheme in the ISL95521BIRZ is a proprietary variable-frequency, hysteretic control method that delivers exceptional light-load efficiency (>90% at 10mA) and sub-10µs load-step response. Unlike fixed-frequency PWM, R3™ dynamically adjusts switching frequency and on-time based on ripple amplitude and load demand-minimizing switching losses at light loads while preserving fast transient recovery. This is critical for modern mobile SoCs with deep sleep states and bursty CPU/GPU activity. The ISL95521BIRZ leverages R3™ across both HPB and NVDC modes to maintain system stability without sacrificing battery life or thermal margin.
Can the ISL95521BIRZ operate without SMBus communication, and what functionality remains available?
Yes, the ISL95521BIRZ retains full hardware-based protection and basic charging functionality without SMBus communication. Hardware current limits for adapter and battery, PROCHOT# assertion for system UV/OC/thermal faults, R3™ regulation, and Turbo mode operation remain fully active. However, SMBus is required to configure operating mode (HPB/NVDC), set charge voltages/currents, select switching frequency, enable/disable features like Battery Learn mode, and read telemetry (adapter/battery current, temperature, status flags). For production systems, SMBus is mandatory to achieve Intel platform compliance and optimize performance-but the ISL95521BIRZ will safely power the system and protect itself even if SMBus is unconnected or nonfunctional.
ISL95521BIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2 ~ 4
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- Over Current, Over Temperature
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 25V
- Interface:
- I2C, SMBus
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (4x4)
ISL95521BIRZ FAQ
1.How can I place an order for ISL95521BIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95521BIRZ 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 ISL95521BIRZ reliable?
The price and inventory of ISL95521BIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95521BIRZ is usually 5 days.
3.What payment methods are accepted for ISL95521BIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95521BIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95521BIRZ?
ISL95521BIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95521BIRZ 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 ISL95521BIRZ?
For technical support, including ISL95521BIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95521BIRZ requirements.
6.How does Aetrix verify that ISL95521BIRZ is sourced from the original manufacturer or authorized distributors?
All ISL95521BIRZ 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 ISL95521BIRZ meets industry standards.
7.What is the process for return or replacement of ISL95521BIRZ?
All ISL95521BIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95521BIRZ, 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 ISL95521BIRZ part is unused and in its original packaging.
Return procedure for ISL95521BIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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