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Renesas ISL97801ARZ-TK
- Part No.:
- ISL97801ARZ-TK
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL97801ARZ-TK.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,274
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Product details
Overview
ISL97801ARZ-TK from Renesas (formerly Intersil) is a high-power LED backlight driver IC with integrated 36V/3A N-channel MOSFET, configurable as boost or buck topology to drive 3–8 series LEDs up to 32V output. It delivers >90% efficiency, supports analog (LEVEL pin) and PWM (EN/PWM pin) dimming, and includes automotive-grade fault protection including load dump handling. It is used in automotive display backlighting systems requiring robust thermal and overvoltage management.
For engineers reviewing the ISL97801ARZ-TK datasheet, ISL97801ARZ-TK pinout, ISL97801ARZ-TK application, or ISL97801ARZ-TK equivalent, key selection criteria include its dual-mode topology configuration (BUCK/BOOSTN pin), integrated 3A FET with 0.25Ω RSWITCH, ±25°C thermal hysteresis, 1MHz switching frequency, and fault-protected FAULT pin driving external N-FET for input disconnect.
Technical Context
The ISL97801ARZ-TK implements current-mode PWM control with an internally generated 1MHz clock and no error amplifier-relying on direct-summing feedback for fast transient response. Its dual topology support is determined by hardwiring BUCK/BOOSTN to GND (boost) or VDC (buck), enabling operation across 2.7V–16V input while delivering up to 1A output current.
It integrates multiple protection functions: overtemperature shutdown at +135°C (with +100°C restart threshold), adjustable LED over-temperature compensation via TEMP/TMAX pins, OVP monitoring (31V/23V hysteresis), and fault latching with 50ms timer. The FAULT pin drives an external N-FET for input disconnection during overvoltage or sustained fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Configurable boost or buck via BUCK/BOOSTN pin; enables flexible LED string voltage alignment relative to input rail |
| Input Voltage Range | 2.7V to 16V; supports single Li-ion, 5V/12V rails, and automotive battery systems with load dump tolerance |
| Output Current | Up to 1A continuous; sufficient for 8× high-power LEDs at 350mA or 4× at 1A with tight current regulation |
| Switching Frequency | 850–1150 kHz typical; enables use of compact 4.7–10 µH inductors and low-profile ceramic capacitors |
| FET RDS(on) | 0.15–0.25 Ω; minimizes conduction loss in high-current LED drive paths, supporting >90% efficiency |
| Thermal Protection | Internal shutdown at +135°C with +25°C hysteresis; plus user-adjustable LED temperature compensation via TEMP/TMAX |
| Dimming Control | Dual-mode: analog bias via LEVEL pin (0.25–3V → 50–300mV FB setpoint) or external PWM on EN/PWM (≤10 kHz) |
Pinout & Package
ISL97801ARZ-TK is housed in a thermally enhanced 20-lead 4mm × 4mm QFN package with exposed thermal pad. Pin assignments are validated per FN6428 Rev 1.00 datasheet (Page 9).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 2.7–16V supply; powers internal LDO and gate drivers; requires local decoupling |
| VDC | Regulated 5V LDO output | Internally regulated 5V supply (±5%); powers control logic and VHI bootstrap; needs ≥3.3µF capacitor |
| BUCK/BOOSTN | Topology select input | Tie to GND for boost mode; tie to VDC for buck mode-defines regulator architecture and gate drive scheme |
| LEVEL | Analog dimming reference | Sets nominal VFB = VLEVEL/5 (0.25–3V → 50–600mV); determines LED bias current via RSENSE |
| EN/PWM | Enable & PWM dimming input | Active-high enable; accepts ≤10 kHz PWM signal for flicker-free dimming; synchronizes ENL gate driver |
| FAULT | Fault protection output | Open-drain output driving external N-FET gate; pulls low during overvoltage, overtemp, or OVP fault |
| TEMP / TMAX | LED thermal compensation interface | TEMP senses thermistor divider; TMAX sets trip threshold-reduces VFB when LED temperature exceeds limit |
| SWD1/SWD2 / SWS1/SWS2 | Power FET terminals | Drain/source connections for integrated 36V/3A N-FET; layout-critical high-current paths for boost/buck switching |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 36V/3A Power FET | Eliminates external high-voltage switch; reduces BOM count and PCB area in space-constrained automotive displays |
| Configurable Boost/Buck Topology | Single IC supports both architectures via BUCK/BOOSTN pin-enables reuse across varying LED string voltages (3–32V) |
| Automotive Load Dump Protection | FAULT pin drives external N-FET to disconnect input during 24V+ transients-meets ISO 7637-2 Pulse 5a requirements |
| LED Temperature Compensation | Adjustable thermal foldback via TEMP/TMAX pins prevents LED degradation at elevated junction temperatures |
| Dual Dimming Interface | Simultaneous support for analog (LEVEL) and PWM (EN/PWM) control allows system-level flexibility in lighting algorithms |
Applications
| Automotive Instrument Cluster Backlight | Industrial HMI Display Backlight |
|---|---|
Use Scenario: Driving 6-series high-brightness white LEDs in a vehicle's digital instrument cluster under wide ambient temperature (-40°C to +85°C) and battery voltage variation (9–16V). IC Role / Device Role / Timing Role: Primary LED current regulator with integrated FET, configured in boost mode to maintain constant 350mA current despite input droop during cold cranking. Use Value: Built-in load dump protection and thermal foldback ensure uninterrupted operation during 24V transients and prevent LED color shift due to thermal drift. | Use Scenario: Powering 4-series LEDs in a factory-floor human-machine interface panel exposed to EMI-rich industrial environments and frequent power cycling. IC Role / Device Role / Timing Role: Buck-mode LED driver with EN/PWM-controlled dimming synchronized to system UI refresh rate (≤10 kHz), minimizing visual artifacts. Use Value: Integrated 1MHz PWM controller eliminates need for external oscillator; FAULT pin latching simplifies fault logging in PLC-connected systems. |
| Automotive Center Stack LCD Backlight | Commercial Digital Signage Backlight |
Use Scenario: Driving 8-series LEDs in a 10.25-inch center console display, requiring precise brightness uniformity and immunity to engine-start voltage sag. IC Role / Device Role / Timing Role: High-efficiency boost converter with analog dimming (LEVEL pin) and optional ENL-driven LED disconnect for zero-current PWM off-periods. Use Value: >90% efficiency at full load reduces thermal load in sealed enclosure; OVP monitoring prevents damage if LED string opens during vibration-induced failure. | Use Scenario: Backlighting a 24-inch retail kiosk display operating 16 hours/day in ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Constant-current LED driver with temperature-compensated current regulation using external NTC thermistor on LED board. Use Value: Adjustable TMAX threshold extends LED lifetime by reducing forward current above 65°C-verified via thermal derating curves in datasheet Figure 15. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL97634 | Lower max output current (500mA vs 1A); no integrated FET; requires external 36V MOSFET; 2.5MHz switching frequency | Targeted at lower-power, cost-sensitive designs where board space permits discrete FET placement | Choose ISL97634 only if peak LED current ≤500mA and design allows external FET layout; not drop-in compatible |
| LM3409QMY/NOPB | Adjustable 1.25MHz frequency; external N-FET required; no integrated VDC LDO or FAULT-driven protection FET driver | Used in non-automotive industrial LED drivers where load dump protection is unnecessary | Select LM3409QMY/NOPB when automotive qualification is not required and thermal/fault features can be implemented externally |
Compared with ISL97801ARZ-TK, ISL97634 offers higher switching frequency but lacks integrated power FET and automotive fault protection, while LM3409QMY/NOPB provides greater frequency flexibility but requires full external power stage and adds complexity for thermal and overvoltage safety compliance.
Availability
ISL97801ARZ-TK is available at Aetrix Electronics and suitable for automotive display backlighting, industrial HMI systems, and commercial digital signage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL97801ARZ-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 delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets.
The ISL97801ARZ-TK belongs to Renesas' high-reliability LED driver product line, engineered specifically for automotive-grade display backlighting with integrated fault protection, thermal management, and topology flexibility.
FAQ
What is the maximum number of LEDs the ISL97801ARZ-TK can drive, and what is the corresponding output voltage?
The ISL97801ARZ-TK can drive up to 8 high-power LEDs in series, supporting output voltages up to 32V. This capability is confirmed in the datasheet's front-page summary and electrical specifications table, where VOUT is specified for 8-LED configurations at 350mA. The device achieves this using its integrated 36V FET and configurable boost topology, making it suitable for automotive LCD backlighting with extended LED strings.
How does the ISL97801ARZ-TK implement thermal protection for connected LEDs?
The ISL97801ARZ-TK implements LED thermal protection via the TEMP and TMAX pins: a thermistor-based voltage divider feeds TEMP, and TMAX sets the trip threshold. When VTEMP exceeds VTMAX, the feedback reference (VFB) is reduced, lowering LED current to prevent overheating. This is distinct from die thermal shutdown (triggered at +135°C), and is fully user-adjustable per application requirements-detailed in the "LED Temperature Control" section of FN6428.
Can the ISL97801ARZ-TK operate in both buck and boost configurations, and how is the mode selected?
Yes, the ISL97801ARZ-TK supports both buck and boost topologies. Mode selection is performed by hardwiring the BUCK/BOOSTN pin: connect to GND for boost operation (output > input), or to VDC (5V) for buck operation (output < input). This hardware-selectable configuration is explicitly defined in the Pin Descriptions and Theory of Operation sections of FN6428 Rev 1.00, and affects gate drive architecture and current limit thresholds (ILIMBOOST = 3.6A, ILIMBUCK = 2.4A).
What is the role of the FAULT pin on the ISL97801ARZ-TK, and what faults does it respond to?
The FAULT pin on the ISL97801ARZ-TK is an open-drain output that drives low during overvoltage (input or output), overtemperature (die or LED), or sustained fault conditions (>50 ms). It controls an external N-channel FET to disconnect the input supply-providing automotive load dump protection and short-circuit safeguarding. The FAULT pin also incorporates an internal charge pump to ensure proper gate drive during startup, as documented in the "Fault Protection" and "Input Overvoltage" sections of FN6428.
Does the ISL97801ARZ-TK require an external Schottky diode in boost mode, and why?
Yes, the ISL97801ARZ-TK requires an external high-speed Schottky diode in boost mode to prevent voltage overshoot and minimize conduction losses. The datasheet explicitly states this in the "Rectifier Diode" section (Page 14), recommending Schottky diodes for their low forward voltage and reverse leakage. While the device includes an internal Schottky between VDC and VHI for bootstrap functionality, it does not replace the main boost rectifier-making an external diode mandatory for proper energy transfer and efficiency.
ISL97801ARZ-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- 32V
- Current - Output / Channel:
- 1A
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
ISL97801ARZ-TK FAQ
1.How can I place an order for ISL97801ARZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL97801ARZ-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 ISL97801ARZ-TK reliable?
The price and inventory of ISL97801ARZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL97801ARZ-TK is usually 5 days.
3.What payment methods are accepted for ISL97801ARZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL97801ARZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL97801ARZ-TK?
ISL97801ARZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL97801ARZ-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 ISL97801ARZ-TK?
For technical support, including ISL97801ARZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL97801ARZ-TK requirements.
6.How does Aetrix verify that ISL97801ARZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL97801ARZ-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 ISL97801ARZ-TK meets industry standards.
7.What is the process for return or replacement of ISL97801ARZ-TK?
All ISL97801ARZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL97801ARZ-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 ISL97801ARZ-TK part is unused and in its original packaging.
Return procedure for ISL97801ARZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL97801ARZ-TK Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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