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Renesas ISL97634ART26Z-T
- Part No.:
- ISL97634ART26Z-T
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
ISL97634ART26Z-T.pdf
- Description:
- IC LED DRIVR WHITE BCKLGT 8-TDFN
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Product details
Overview
ISL97634ART26Z-T from Intersil is a PWM-controlled boost white LED driver IC designed for small LCD panel backlighting, delivering up to 26V output with integrated Schottky diode, overvoltage protection (OVP = 26V), and PWM dimming from DC to 32kHz. It operates from 2.4V–5.5V input, achieves 85% efficiency, and supports 2–7 series LEDs in portable displays.
For engineers reviewing the ISL97634ART26Z-T datasheet, ISL97634ART26Z-T pinout, ISL97634ART26Z-T application, or ISL97634ART26Z-T equivalent, key selection criteria include OVP threshold matching (26V), TDFN-8 thermal pad layout, feedback disconnect switch (FBSW) use for linear dimming, and compatibility with 1.4MHz switching frequency LC filtering.
Technical Context
The ISL97634ART26Z-T implements constant-frequency current-mode control with internal compensation, enabling stable regulation across line and load variations. Its 1.4MHz switching frequency allows compact 10µH/22µH inductors and ceramic capacitors, while the FBSW terminal isolates the feedback node during PWM off-time to prevent output capacitor discharge and maintain dimming linearity.
OVP is fixed at 26V (per ordering code), triggering shutdown of LX switching until VOUT drops ~7% below threshold-without full device shutdown. The IC integrates a 900mΩ LX switch, 95mV FB reference, and 1µA shutdown current, supporting operation from –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 26V - sets maximum safe output voltage for 7-series LED strings; prevents overvoltage damage to LEDs and output capacitor |
| Input Voltage Range | 2.4V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V) and regulated 3.3V/5V rails in portable systems |
| PWM Dimming Range | DC to 32kHz - enables flicker-free dimming above audible range; linearity preserved down to <1% duty cycle at 1kHz |
| Switching Frequency | 1.4MHz (typ) - permits use of small 10µH–22µH inductors and 0.22µF–1µF ceramic capacitors, reducing board area |
| Efficiency | 85% - measured at 4V input, 3–7 LEDs, 10µH/22µH inductor; higher with optimized inductor selection |
| Shutdown Current | 1µA - minimizes battery drain in mobile devices when PWM/EN is low |
| Feedback Reference | 95mV (typ) - sets LED current via external RSET resistor; enables precise current programming with <±5% tolerance |
Pinout & Package
ISL97634ART26Z-T is housed in an 8-lead TDFN package (2mm × 3mm) with exposed thermal pad, optimized for high-power-density portable backlight designs. Thermal pad must be soldered to PCB ground plane for reliable operation at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal ground reference | Primary return path for VIN, FB, and thermal pad; must connect directly to low-impedance ground plane |
| VIN (Pin 2) | Main power input | Supplies internal circuitry and LX switch; requires local 0.22µF decoupling capacitor placed adjacent to pin |
| PWM/EN (Pin 3) | Control input | High = enable constant-current mode; external PWM signal = dimming control; low = 1µA shutdown state |
| NC (Pin 4) | No-connect | Not internally bonded; must remain unconnected and unrouted on PCB |
| FB (Pin 5) | Current-sense feedback | Monitors voltage across RSET to regulate LED current; 95mV reference enables accurate ILED = 95mV/RSET |
| FBSW (Pin 6) | Feedback disconnect switch | Opens during PWM off-time to isolate FB from cathode node, preventing output discharge and preserving dimming linearity |
| VOUT (Pin 7) | Boost output | Connects to top LED anode and output capacitor; rated for 26V max per OVP setting |
| LX (Pin 8) | Switching node | Drives external inductor; internal 470mA peak-current switch with 900mΩ RDS(on); requires short, low-inductance trace to inductor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reducing BOM count and board space; forward drop 600–850mV at 100mA |
| 26V overvoltage protection | Hardware-enforced safety limit for 7-series LED strings; auto-recovery without latch-off or reset required |
| Feedback disconnect switch (FBSW) | Enables true PWM dimming linearity down to <1% duty cycle by isolating FB during off-time |
| Internally compensated control loop | Removes need for external compensation components; simplifies design and improves production yield |
| 1.4MHz fixed-frequency operation | Supports miniature passive components; avoids AM radio band interference; enables fast transient response |
Applications
| Cell Phone Backlighting | Smartphone Display |
|---|---|
Use Scenario: Driving 3–5 white LEDs in a 3.5"–4.3" LCD backlight powered by single-cell Li-ion battery (2.7–4.2V). IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current via RSET and FB, with PWM dimming synchronized to display frame rate. Use Value: 85% efficiency extends battery life; 26V OVP safely supports full LED string even at end-of-discharge; FBSW ensures flicker-free dimming at 1kHz. | Use Scenario: High-brightness backlight for 5"–6" AMOLED or LCD panels requiring precise brightness control across ambient light conditions. IC Role / Device Role / Timing Role: Primary LED current source with DC-to-32kHz PWM interface, using internal 95mV reference for ±3% current accuracy. Use Value: Wide dimming range enables seamless transition from daylight to night mode; 1µA shutdown current preserves standby battery life. |
| Portable GPS Unit | Automotive Navigation Panel |
Use Scenario: Compact backlight solution for outdoor-readable 4.3" GPS display operating across –40°C to +85°C temperature range. IC Role / Device Role / Timing Role: Robust boost driver with thermal-pad-enhanced TDFN-8 package, delivering stable current despite wide input voltage swing (2.4–5.5V). Use Value: Guaranteed operation over full industrial temp range; integrated OVP protects against open-circuit LED failure; no external diode reduces thermal stress. | Use Scenario: Dashboard-integrated navigation screen requiring EMI-robust, high-reliability backlight with minimal component count. IC Role / Device Role / Timing Role: Single-chip LED driver with internal compensation and 1.4MHz switching, minimizing conducted emissions and filter complexity. Use Value: Reduced BOM and layout area versus discrete solutions; FBSW eliminates PWM-induced system noise coupling into sensitive analog sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL97634IRT18Z-T | OVP fixed at 18V (vs. 26V); same pinout, package, and feature set | Suitable for 4–5 LED strings; lower max output voltage limits string length and brightness headroom | Select only if 18V OVP matches target LED string Vf and margin requirements |
| RT9397BZSP | 28V OVP, 1.2MHz switching, no integrated Schottky diode; requires external diode and compensation | Higher OVP but increased BOM count and layout complexity; less integrated than ISL97634ART26Z-T | Choose when higher OVP margin is needed and external diode integration is acceptable |
Compared with ISL97634IRT18Z-T, the ISL97634ART26Z-T supports longer LED strings and higher brightness; compared with RT9397BZSP, it offers lower system cost and smaller footprint due to integrated diode and internal compensation-critical for space-constrained portable designs.
Availability
ISL97634ART26Z-T is available at Aetrix Electronics and suitable for cell phone backlighting, smartphone display modules, and portable GPS units requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C operation.
Supply support for ISL97634ART26Z-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
Intersil Corporation is a U.S.-based designer of high-performance analog, mixed-signal, and power management semiconductors, now part of Renesas Electronics.
The ISL97634 product line delivers highly integrated white LED drivers for portable display backlighting, emphasizing low quiescent current, wide dimming range, and simplified layout through integration of diode, OVP, and compensation.
FAQ
What is the OVP threshold for ISL97634ART26Z-T?
The ISL97634ART26Z-T has a fixed overvoltage protection threshold of 26V, as indicated by the "26" in its part number. This OVP level is hardware-defined and non-adjustable, designed to protect 7-series white LED strings. When VOUT reaches 26V, the LX switch disables until VOUT falls to approximately 24.2V (7% below threshold), after which normal operation resumes. This behavior is confirmed in the Electrical Specifications table on page 4 of FN6264 Rev 4.00.
Does ISL97634ART26Z-T require external compensation components?
No, the ISL97634ART26Z-T features internal compensation, eliminating the need for external RC networks on the COMP or FB pins. This is explicitly stated in the Features list ("Internally Compensated") and reinforced in the Detailed Description section (page 8), which notes that the internal network ensures reliable operation under specified conditions. Designers can proceed with layout using only the recommended input/output capacitors and RSET without adding compensation parts.
How does the FBSW pin improve PWM dimming performance in ISL97634ART26Z-T?
The FBSW pin in the ISL97634ART26Z-T acts as a feedback disconnect switch that opens during PWM off-time, isolating the FB pin from the LED cathode node. As described on page 7, this prevents the output capacitor from discharging through the sense resistor, maintaining accurate current regulation and linear dimming-even at low duty cycles (<1% at 1kHz). Without FBSW, output modulation and poor linearity occur, as shown in Figure 13 versus Figure 14 of the datasheet.
What inductor value is recommended for ISL97634ART26Z-T in a 5-LED string application?
The ISL97634ART26Z-T supports inductors from 10µH to ~82µH, with 10µH and 22µH explicitly validated in the Typical Application Circuit (page 1) and Efficiency curves (page 5). For a 5-LED string at ~18V Vout and 20mA current, 22µH is preferred: it reduces peak inductor current (per Equation 4), lowers conduction losses, and improves efficiency-especially noticeable in Figure 2 where 22µH outperforms 10µH across most duty cycles. Inductor saturation current must exceed 470mA peak.
Is ISL97634ART26Z-T compatible with automotive navigation panel designs?
Yes, the ISL97634ART26Z-T is specified for operation from –40°C to +85°C ambient temperature and features robust protections including 26V OVP, thermal shutdown (via junction limit of +125°C), and 1µA shutdown current-making it suitable for automotive navigation panels. Its integrated Schottky diode and FBSW reduce EMI susceptibility, and the TDFN-8 package with thermal pad supports reliable thermal dissipation in enclosed dashboard environments, as noted in Applications (page 1) and Thermal Information (page 4).
ISL97634ART26Z-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- -
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
ISL97634ART26Z-T FAQ
1.How can I place an order for ISL97634ART26Z-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL97634ART26Z-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 ISL97634ART26Z-T reliable?
The price and inventory of ISL97634ART26Z-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL97634ART26Z-T is usually 5 days.
3.What payment methods are accepted for ISL97634ART26Z-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL97634ART26Z-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL97634ART26Z-T?
ISL97634ART26Z-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL97634ART26Z-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 ISL97634ART26Z-T?
For technical support, including ISL97634ART26Z-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL97634ART26Z-T requirements.
6.How does Aetrix verify that ISL97634ART26Z-T is sourced from the original manufacturer or authorized distributors?
All ISL97634ART26Z-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 ISL97634ART26Z-T meets industry standards.
7.What is the process for return or replacement of ISL97634ART26Z-T?
All ISL97634ART26Z-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL97634ART26Z-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 ISL97634ART26Z-T part is unused and in its original packaging.
Return procedure for ISL97634ART26Z-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL97634ART26Z-T Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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