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Renesas ISL95538BHRTZ-TK
- Part No.:
- ISL95538BHRTZ-TK
- Manufacturer:
- Renesas
- Category:
- Battery Chargers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
ISL95538BHRTZ-TK.pdf
- Description:
- IC BATT CHG LI-ION 1-4CEL 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
ISL95538BHRTZ-TK from Renesas Electronics is a buck-boost Narrow VDC (NVDC) battery charger IC designed for power bank and mobile computing platforms. It supports 1–4-cell Li-ion batteries, operates from 3.2V to 23.4V input, regulates system bus voltage from 3V to 18.304V, and delivers up to 1MHz switching with SMBus/I²C programmability for autonomous charging in Ultrabook and tablet systems.
For engineers reviewing the ISL95538BHRTZ-TK datasheet, ISL95538BHRTZ-TK pinout, ISL95538BHRTZ-TK application, or ISL95538BHRTZ-TK equivalent, key selection considerations include NVDC topology support, reverse buck/boost capability from battery, PROCHOT# compliance, AMON/BMON current monitoring, and Turbo-mode ideal diode control in compact 4×4 mm TQFN packaging.
Technical Context
The ISL95538BHRTZ-TK implements Renesas' R3™ Technology for high light-load efficiency and fast transient response in dual-phase buck-boost operation. It integrates dual synchronous gate drivers (UGATE1/LGATE1/UGATE2/LGATE2), adaptive dead-time control, and integrated bootstrap circuitry for both high-side FETs.
Its SMBus/I²C interface enables real-time configuration of charge voltage/current, adapter current limits, ship mode entry, and OTG output control. The device supports autonomous charging states-including trickle charge for depleted batteries-and provides system-level protection via BATGONE, ACOK, and PROCHOT# signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost NVDC charger with dual-phase synchronous operation for seamless source arbitration between adapter and battery. |
| Input Voltage Range | 3.2V to 23.4V - supports USB PD, travel adapters, and legacy DC sources without input dead zone. |
| System Output Range | 3.0V to 18.304V - programmable narrow-range bus regulation for stable SoC/system rail supply. |
| Switching Frequency | Up to 1MHz - enables compact external magnetics and optimized EMI performance in space-constrained power banks. |
| Current Monitoring | AMON/BMON analog outputs - provide simultaneous adapter and battery current sensing for accurate power path management. |
| Interface Protocol | SMBus v2.0 and auto-increment I²C - allows full parameter programming including charge termination, recharge thresholds, and thermal foldback. |
| Package | 4×4 mm, 32-lead TQFN - thermally enhanced exposed pad for high-power density in portable applications. |
Pinout & Package
ISL95538BHRTZ-TK is housed in a 4×4 mm, 32-lead TQFN package with exposed thermal pad (EP). The package supports reflow soldering per JEDEC J-STD-020 and provides low thermal resistance (θJA ≈ 35°C/W) for continuous 3A+ output operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDP | High-side gate driver supply | Provides regulated 5V bias for UGATE1/UGATE2 drivers; decoupled externally for noise immunity. |
| UGATE1 / UGATE2 | High-side N-channel MOSFET gate drive outputs | Drive external upper FETs in each phase; support 1MHz switching with adaptive dead-time control. |
| LGATE1 / LGATE2 | Low-side N-channel MOSFET gate drive outputs | Drive synchronous rectifiers; integrated bootstrap diodes eliminate need for external diodes. |
| PHASE1 / PHASE2 | Power switch node connections | Connect to external inductor–FET nodes; require low-inductance layout for EMI and efficiency optimization. |
| BOOT1 / BOOT2 | Bootstrap capacitor connections | Support floating high-side gate drive; each requires dedicated 0.1µF ceramic capacitor to VDDP. |
| SCL / SDA | SMBus/I²C bidirectional interface | Enable full configuration and telemetry readback; support multi-drop addressing and auto-increment writes. |
| PROCHOT# | Open-drain thermal throttle signal | IMVP-compliant active-low output asserted during thermal or current limit events to throttle CPU. |
| AMON / BMON | Analog current monitor outputs | Provide 10mV/A scaled voltage proportional to adapter and battery current for system-level power budgeting. |
| BATGONE | Battery presence indicator | Open-drain output pulled low when battery voltage falls below 2.5V - signals depleted battery condition. |
| ACOK | Adapter presence/status flag | Push-pull output indicating valid adapter input voltage above 3.2V with internal hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| NVDC System Bus Regulation | Maintains tight ±1% system output voltage across adapter/battery source transitions - eliminates brownouts during plug/unplug events. |
| Reverse Buck-Boost Operation | Enables OTG power delivery from 2–4-cell battery to USB input port at up to 5V/2A - no external boost converter required. |
| Autonomous Charging Logic | Integrated state machine handles CC/CV charging, end-of-charge detection, and automatic recharge at 3% depth - reduces host firmware overhead. |
| Turbo Mode Ideal Diode Control | Disables low-side FETs and enables body-diode conduction during high-current adapter-to-battery transfer - improves efficiency by ~3% at 3A. |
| Two-Level Adapter Current Limit | Configurable primary (e.g., 3.5A) and secondary (e.g., 2.0A) limits - supports dynamic adapter capability negotiation via SMBus. |
Applications
| USB Power Bank | Ultrabook Platform Charger |
|---|---|
Use Scenario: Portable power bank delivering regulated 5V/9V/15V USB PD output while simultaneously charging internal 3S Li-ion battery from wall adapter or laptop USB-C port. IC Role / Device Role / Timing Role: ISL95538BHRTZ-TK acts as bidirectional NVDC controller managing power flow between input source, battery, and system bus - enabling simultaneous charge + OTG. Use Value: Eliminates need for separate buck charger and boost OTG IC; single-chip solution reduces BOM count by 2 ICs and PCB area by >35%. | Use Scenario: Notebook platform requiring seamless transition between AC adapter and battery power without system reset or voltage droop during adapter insertion/removal. IC Role / Device Role / Timing Role: ISL95538BHRTZ-TK serves as primary system power manager - regulating VSYS to 12.6V while dynamically balancing adapter current, battery charge current, and system load. Use Value: Achieves <100µs transient response to 5A load steps and maintains VSYS within ±15mV - meets IMVP-9 VR13.0 stability requirements. |
| Tablet Battery Management | Industrial Handheld Terminal |
Use Scenario: 10.1" Android tablet with 2-cell Li-ion battery, supporting fast charging from USB-C PD and maintaining runtime during hot-swap battery replacement. IC Role / Device Role / Timing Role: ISL95538BHRTZ-TK functions as adaptive NVDC charger and system rail controller - enabling battery-independent system operation during charging or discharging. Use Value: Supports trickle charge down to 1.5V/cell and autonomous recharge at 3% SOC - extends usable battery life by 12% over fixed-threshold chargers. | Use Scenario: Ruggedized handheld terminal used in warehouse logistics, operating from removable 3S Li-ion pack and powered via vehicle USB or 12V DC jack. IC Role / Device Role / Timing Role: ISL95538BHRTZ-TK provides dual-input power path control - selecting optimal source (vehicle DC or battery) while protecting against reverse polarity and overvoltage. Use Value: Integrated PROCHOT# and AMON/BMON enable real-time thermal derating and battery health monitoring - reduces field failure rate by 22% in high-temp environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost NVDC charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| bq25703A from Texas Instruments | Single-phase architecture; supports USB PD 3.0 programmable power supply (PPS); lacks Turbo mode ideal diode control. | Targeted at USB-C laptop docks and portable monitors; does not support reverse buck operation from battery. | Select bq25703A when PPS compliance and smaller footprint (3×3 QFN) outweigh need for reverse buck OTG capability. |
| MP8859 from Monolithic Power Systems | Fixed 500kHz switching; no SMBus interface - configured via resistor dividers and EN pins; no PROCHOT# output. | Cost-sensitive industrial battery packs where firmware configurability and IMVP compliance are not required. | Choose MP8859 for simplified design-in and lower unit cost where autonomous charging and thermal throttling integration are non-critical. |
Compared with bq25703A and MP8859, the ISL95538BHRTZ-TK uniquely combines dual-phase buck-boost NVDC regulation, reverse OTG power delivery, IMVP-compliant PROCHOT#, and full SMBus configurability - making it optimal for premium mobile computing platforms requiring robust source arbitration and firmware-defined power policies.
Availability
ISL95538BHRTZ-TK is available at Aetrix Electronics and suitable for USB power banks, Ultrabook platforms, tablet battery management systems, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and automotive-grade reliability screening.
Supply support for ISL95538BHRTZ-TK 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 headquartered in Tokyo, Japan, specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and computing markets.
The ISL95538BHRTZ-TK belongs to Renesas' ISL95xxx battery charger product line, engineered specifically for high-efficiency, software-configurable NVDC power management in thin-and-light mobile computing and portable power applications.
FAQ
What is the maximum supported battery configuration for the ISL95538BHRTZ-TK?
The ISL95538BHRTZ-TK supports 1-, 2-, 3-, or 4-series cell Li-ion battery packs. Its wide input range (3.2V to 23.4V) accommodates nominal voltages from 3.7V (1S) to 14.8V (4S), with full charge voltages up to 16.8V. The device includes cell balancing readiness detection and supports trickle charging down to 1.5V per cell - critical for recovering deeply discharged packs in power bank use cases. This flexibility makes ISL95538BHRTZ-TK suitable for diverse portable platforms without hardware redesign.
Does the ISL95538BHRTZ-TK support USB On-The-Go (OTG) functionality?
Yes, the ISL95538BHRTZ-TK supports bidirectional OTG via its reverse buck, boost, and buck-boost capability. When only the battery is present, it can deliver regulated 5V output to the USB input port (DCIN) at up to 2A - enabling power bank mode. The OTGEN/CMIN and OTGPG/CMOUT pins provide dedicated control and status signaling for OTG handshake and current limiting. This eliminates the need for a separate boost converter, reducing system cost and board area in devices requiring dual-role USB power delivery.
How does the ISL95538BHRTZ-TK implement NVDC (Narrow VDC) system regulation?
The ISL95538BHRTZ-TK implements NVDC by tightly regulating the VSYS output to a narrow DC range (3.0V to 18.304V) regardless of input source. It continuously arbitrates between adapter and battery using dual-phase synchronous rectification, maintaining system rail stability during source transitions. The device uses internal error amplifiers and R3™ Technology to achieve ±1% output accuracy and sub-100µs transient response to 5A load steps - ensuring uninterrupted operation in Ultrabook and tablet platforms where brownouts must be avoided during AC adapter plug/unplug events.
What protection features are integrated into the ISL95538BHRTZ-TK?
The ISL95538BHRTZ-TK integrates comprehensive protection including overvoltage (OVP), overcurrent (OCP), overtemperature (OTP), battery over-discharge (BATGONE), and adapter presence loss (ACOK). It features dual-level adapter current limiting, thermal foldback via PROCHOT#, and ideal diode control in Turbo mode to prevent reverse current flow. All protections are hardware-based with configurable thresholds via SMBus - enabling robust fault handling without host intervention. These safeguards ensure safe operation across consumer and industrial temperature ranges and extend battery cycle life in demanding applications.
Is the ISL95538BHRTZ-TK pin-compatible with earlier ISL95538 variants?
No, the ISL95538BHRTZ-TK is not pin-compatible with earlier ISL95538 variants such as ISL95538 or ISL95538A. While sharing the same 4×4 mm 32-lead TQFN package outline, the ISL95538BHRTZ-TK introduces updated pin assignments for enhanced functionality - including dedicated OTG control pins (OTGEN/OTGPG), revised PROCHOT# behavior, and relocated current sense inputs. Designers must consult the FN8935 Rev. 5.00 datasheet for exact pin mapping and cannot assume drop-in replacement. Migration requires schematic and layout revision.
ISL95538BHRTZ-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- R3™
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1 ~ 4
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 18.3V (Max)
- Voltage - Supply (Max):
- 23.4V
- Interface:
- I2C, SMBus
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (4x4)
ISL95538BHRTZ-TK FAQ
1.How can I place an order for ISL95538BHRTZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95538BHRTZ-TK 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 ISL95538BHRTZ-TK reliable?
The price and inventory of ISL95538BHRTZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95538BHRTZ-TK is usually 5 days.
3.What payment methods are accepted for ISL95538BHRTZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95538BHRTZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95538BHRTZ-TK?
ISL95538BHRTZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95538BHRTZ-TK 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 ISL95538BHRTZ-TK?
For technical support, including ISL95538BHRTZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95538BHRTZ-TK requirements.
6.How does Aetrix verify that ISL95538BHRTZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL95538BHRTZ-TK 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 ISL95538BHRTZ-TK meets industry standards.
7.What is the process for return or replacement of ISL95538BHRTZ-TK?
All ISL95538BHRTZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL95538BHRTZ-TK, 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 ISL95538BHRTZ-TK part is unused and in its original packaging.
Return procedure for ISL95538BHRTZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL95538BHRTZ-TK Tags
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