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Renesas ISL97635IRZ-TKS2038
- Part No.:
- ISL97635IRZ-TKS2038
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
ISL97635IRZ-TKS2038.pdf
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- IC AMP CLASS
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Product details
Overview
ISL97635IRZ-TKS2038 from Renesas Electronics is an SMBus-controlled 8-channel LED driver IC designed for LCD backlighting in notebook, monitor, and automotive displays. It delivers up to 30mA per channel with ±1% typical current matching, supports 6V–24V input, regulates output up to 34.5V, and integrates dynamic headroom control to minimize power loss across 8 independent LED strings.
For engineers reviewing the ISL97635IRZ-TKS2038 datasheet, ISL97635IRZ-TKS2038 pinout, ISL97635IRZ-TKS2038 application, or ISL97635IRZ-TKS2038 equivalent, key selection considerations include SMBus/external PWM dimming flexibility, DPST-compliant dual-control dimming, selectable 600kHz/1.2MHz switching frequency, and integrated fault detection (open/short-circuit, OVP, OTP) with register-accessible status reporting.
Technical Context
The ISL97635IRZ-TKS2038 implements a current-mode PWM boost converter with dual-loop regulation: fast inner current loop for transient response and slow outer voltage loop referenced to the highest forward-voltage LED string via dynamic headroom control. This architecture enables stable operation during battery-to-adapter transitions in portable systems.
Its SMBus interface supports 256-level DC and PWM brightness control, while external PWMI input enables audio-noise-free dimming up to 20kHz. The device combines programmable short-circuit thresholds, configurable fault disconnect (FAULT pin), and register-based configuration of switching frequency, dimming mode, and protection parameters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 24V - supports wide-range DC supplies including automotive battery (12V nominal) and industrial adapters. |
| Max Output Voltage | 34.5V - sufficient to drive up to 9× 3.5V LEDs per channel in series (72 total LEDs). |
| LED Current Matching | ±1% typical - ensures uniform luminance across 8 independent backlight zones without manual calibration. |
| Dimming Control Modes | SMBus PWM (100Hz–5kHz), external PWM (≤20kHz), DPST-compliant combined mode, and DC-to-PWM - enables Intel DPST compliance and flicker-free display control. |
| Switching Frequency | Selectable 600kHz or 1.2MHz - balances efficiency vs. EMI and allows optimization of external inductor size. |
| Fault Detection | String open/short, OVP, OTP, input overcurrent - faults logged in Fault/Status register for system-level diagnostics and recovery. |
| Package | 24-lead 4mm × 4mm QFN - compact footprint with exposed thermal pad for thermal management in space-constrained displays. |
Pinout & Package
ISL97635IRZ-TKS2038 is housed in a 24-lead, 4mm × 4mm QFN package with exposed thermal pad (PKG DWG L24.4x4D). Pin 1 is marked by a dot; pins are numbered counterclockwise from top-left corner in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SMBCLK / SMBDAT | SMBus interface clock/data | Two-wire digital control bus for configuring brightness, dimming mode, fault registers, and device identification. |
| PWMI/EN | Enable + PWM input | Dual-function pin: rising edge >40µs enables device; subsequent PWM signal controls dimming (up to 20kHz); >28ms off-time triggers shutdown. |
| IIN0–IIN7 | LED string feedback inputs | Eight dedicated inputs monitoring cathode-side voltage of each LED string for dynamic headroom control and short-circuit detection. |
| RSET | Current reference setting | Resistor-connected pin sets maximum per-channel LED current (e.g., 36.6kΩ → 30mA); accuracy depends on resistor tolerance. |
| LX | Boost switch node | Drives external boost inductor; internal FET rated for 3.2A peak current and 260mΩ RDS(ON). |
| FAULT | Fault disconnect output | Open-drain output pulls low on fault; can drive external master disconnect switch to isolate faulty LED string. |
| VIN / PGND / GND | Power supply and returns | VIN powers internal circuitry and LED boost path; PGND is high-current LX return; GND is analog reference ground. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic headroom control | Monitors highest-VF LED string and regulates boost output to minimum required voltage - reduces power loss by up to 30% vs. fixed-output designs. |
| DPST-compliant dimming | Combines SMBus-programmed PWM with external PWMI signal to meet Intel Display Power Saving Technology requirements for adaptive backlight control. |
| Configurable short-circuit threshold | Two selectable VSC levels (3.1V or 8V) allow tuning for different LED stack configurations and fault sensitivity. |
| Register-accessible fault logging | Fault/Status register stores open-circuit, short-circuit, OVP, OTP, and input overcurrent events - enables firmware-based diagnostics without additional sensors. |
| DC-to-PWM conversion | Converts analog DC input (0.21V–1.21V) at PWMO into proportional PWM duty cycle - supports light-sensor-based ambient brightness control. |
Applications
| Notebook Display Backlighting | Automotive Instrument Cluster |
|---|---|
Use Scenario: Driving RGB LED backlight in high-resolution 13–15 inch notebook panels with local dimming zones. IC Role / Device Role / Timing Role: 8-channel current source with SMBus-controlled per-zone brightness and dynamic headroom regulation. Use Value: Enables uniform color gamut and contrast across zones using ±1% current matching and real-time VF-based voltage optimization. | Use Scenario: Illuminating TFT-LCD instrument clusters in vehicles requiring AEC-Q100-compliant operation and EMI resilience. IC Role / Device Role / Timing Role: High-reliability LED driver with OVP, OTP, and short-circuit protection plus register-accessible fault reporting. Use Value: Ensures fail-safe backlight operation under load dump (24V transients) and thermal stress, meeting automotive functional safety expectations. |
| LCD Monitor Backlighting | Traffic Signal Module |
Use Scenario: Powering WLED arrays in 24–32 inch desktop monitors with flicker-free dimming. IC Role / Device Role / Timing Role: SMBus-configurable 8-channel driver supporting 20kHz external PWM for audio-noise-free dimming. Use Value: Eliminates audible coil whine during brightness adjustment while maintaining 256-step resolution and <1% current ripple. | Use Scenario: Controlling red/green/amber LED stacks in outdoor traffic signals with extended temperature range and surge immunity. IC Role / Device Role / Timing Role: Robust LED driver operating from -40°C to +85°C with input overcurrent protection and fault-disconnect capability. Use Value: Delivers consistent lumen output across temperature extremes and prevents single-string failure from disabling full signal indication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL97636IRZ | Same 8-channel architecture but adds I²C compatibility alongside SMBus; identical pinout and electrical specs. | Preferred where legacy I²C infrastructure exists or multi-protocol host controller support is required. | Drop-in replacement if I²C support is needed; no layout or firmware changes required beyond bus protocol initialization. |
| LM3409QMH/NOPB | Single-channel buck-boost LED controller with external MOSFETs; no integrated current sources or SMBus interface. | Suitable for high-power, thermally demanding applications where discrete FETs enable higher efficiency or custom thermal design. | Requires redesign of power stage and control firmware; selected when >30mA/channel or >34.5V output is needed beyond ISL97635IRZ-TKS2038 limits. |
Compared with ISL97636IRZ, ISL97635IRZ-TKS2038 offers SMBus-only control with identical performance and footprint-ideal for cost-optimized, protocol-dedicated systems. Versus LM3409QMH/NOPB, it trades external component flexibility for integration, reducing BOM count and enabling rapid deployment in multi-string backlight modules.
Availability
ISL97635IRZ-TKS2038 is available at Aetrix Electronics and suitable for notebook display backlighting, automotive instrument cluster illumination, and LCD monitor LED driving requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL97635IRZ-TKS2038 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 microcontrollers, analog, power, and SoC solutions for automotive, industrial, and consumer markets.
The ISL97635IRZ-TKS2038 belongs to Renesas' high-precision LED driver product line, engineered specifically for energy-efficient, multi-zone LCD backlight systems requiring tight current matching, robust fault handling, and flexible digital dimming control.
FAQ
What is the maximum number of LEDs the ISL97635IRZ-TKS2038 can drive?
The ISL97635IRZ-TKS2038 can drive up to 72 LEDs (8 channels × 9 LEDs per string) at 3.5V/30mA, or 80 LEDs (8 × 10) at 3.2V/20mA. Its 34.5V maximum output voltage and dynamic headroom control ensure reliable operation across varying forward voltage distributions in stacked LED configurations.
Does the ISL97635IRZ-TKS2038 support Intel DPST compliance?
Yes, the ISL97635IRZ-TKS2038 supports Intel Display Power Saving Technology (DPST) through its DPST dimming mode, which multiplies SMBus-programmed PWM duty cycle with an external PWMI signal. This ratiometric dimming method meets DPST's adaptive backlight control requirements without requiring host CPU intervention.
How is LED current accuracy set on the ISL97635IRZ-TKS2038?
LED current accuracy on the ISL97635IRZ-TKS2038 is set primarily by the external RSET resistor, with typical absolute accuracy of ±3%. For example, a 36.6kΩ resistor yields ~30mA per channel. Channel-to-channel matching remains ±1% typical regardless of RSET tolerance, ensuring uniform brightness across all 8 strings.
What protection features does the ISL97635IRZ-TKS2038 include?
The ISL97635IRZ-TKS2038 integrates string open-circuit and short-circuit detection (with selectable thresholds), overvoltage protection (OVP), overtemperature protection (OTP), thermal shutdown, and optional input overcurrent protection with master fault disconnect. All fault conditions are recorded in the Fault/Status register for diagnostic access via SMBus.
Can the ISL97635IRZ-TKS2038 operate from a 5V input supply?
No-the ISL97635IRZ-TKS2038 requires a minimum 6V input supply per its absolute maximum ratings and operational specifications. Input below 6V will trigger undervoltage lockout (VUVLO = 2.45V–2.8V), preventing startup. For sub-6V applications, alternative drivers with lower VIN minima must be selected.
ISL97635IRZ-TKS2038 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
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- -
- Topology:
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- Internal Switch(s):
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- Number of Outputs:
- -
- Voltage - Supply (Min):
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- Voltage - Supply (Max):
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- Voltage - Output:
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- Current - Output / Channel:
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- Frequency:
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- Dimming:
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- Operating Temperature:
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- Grade:
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- Mounting Type:
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- Supplier Device Package:
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ISL97635IRZ-TKS2038 FAQ
1.How can I place an order for ISL97635IRZ-TKS2038 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL97635IRZ-TKS2038 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 ISL97635IRZ-TKS2038 reliable?
The price and inventory of ISL97635IRZ-TKS2038 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL97635IRZ-TKS2038 is usually 5 days.
3.What payment methods are accepted for ISL97635IRZ-TKS2038?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL97635IRZ-TKS2038 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL97635IRZ-TKS2038?
ISL97635IRZ-TKS2038 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL97635IRZ-TKS2038 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 ISL97635IRZ-TKS2038?
For technical support, including ISL97635IRZ-TKS2038 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL97635IRZ-TKS2038 requirements.
6.How does Aetrix verify that ISL97635IRZ-TKS2038 is sourced from the original manufacturer or authorized distributors?
All ISL97635IRZ-TKS2038 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 ISL97635IRZ-TKS2038 meets industry standards.
7.What is the process for return or replacement of ISL97635IRZ-TKS2038?
All ISL97635IRZ-TKS2038 units undergo pre-shipment inspection (PSI). If there is an issue with ISL97635IRZ-TKS2038, 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 ISL97635IRZ-TKS2038 part is unused and in its original packaging.
Return procedure for ISL97635IRZ-TKS2038:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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