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Renesas ISL97634IRT26Z-T
- Part No.:
- ISL97634IRT26Z-T
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL97634IRT26Z-T.pdf
- Description:
- IC LED DRVR RGLTR PWM 30MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,326
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Product details
Overview
ISL97634IRT26Z-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, 26V overvoltage protection (OVP), and PWM dimming from DC to 32kHz. It operates from 2.4V–5.5V input, supports 2–7 series LEDs, and achieves 85% efficiency at 1.4MHz switching frequency.
For engineers reviewing the ISL97634IRT26Z-T datasheet, ISL97634IRT26Z-T pinout, ISL97634IRT26Z-T application, or ISL97634IRT26Z-T equivalent, this page provides verified technical context, real-world dimming linearity data, OVP threshold validation, thermal pad layout guidance, and confirmed alternative options for LED backlighting designs in portable consumer and automotive displays.
Technical Context
The ISL97634IRT26Z-T uses constant-frequency current-mode control with internal compensation, enabling stable operation across 2.4V–5.5V input and -40°C to +85°C ambient. Its 26V OVP threshold is factory-set and non-adjustable, protecting against output overvoltage when driving up to seven 3.5V white LEDs in series.
It implements a dedicated FBSW feedback disconnect switch to isolate the FB node during PWM off-time, eliminating output capacitor discharge and preserving dimming linearity-especially critical below 5% duty cycle at 20kHz PWM. The 1.4MHz switching frequency allows compact 10µH–22µH inductors and ceramic LC filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 26V - fixed trip point; disables LX switching until VOUT falls ~1.8V below threshold, enabling use of lower-voltage-rated output capacitors |
| Input Voltage Range | 2.4V to 5.5V - supports single-cell Li-ion (2.7–4.2V) and regulated 3.3V/5V rails without external LDO |
| PWM Dimming Range | DC to 32kHz - linear dimming down to <1% duty cycle at 1kHz; 5–100% linear range at 20kHz |
| Switching Frequency | 1.4MHz (typ) - enables small 10µH–22µH inductors and low-ESR ceramic output capacitors (0.22–1µF) |
| Efficiency | 85% (typ) - measured at 4V input, 3–7 LEDs, 25mA peak current, with 10µH/22µH inductor selection |
| Shutdown Current | 1µA - achieved by pulling PWM/EN low; ensures battery longevity in always-on portable devices |
| Feedback Voltage | 95mV (typ) - sets LED current via external RSET; enables precise current matching across multiple channels |
Pinout & Package
ISL97634IRT26Z-T is housed in an 8-lead TDFN package (2mm × 3mm) with exposed thermal pad. The package requires solder connection of the thermal pad to PCB ground plane for optimal thermal performance (θJC = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal reference ground | Must connect directly to local ground plane; serves as return path for FB sense current and thermal pad |
| 2 VIN | Main power input | Supplies internal circuitry and LX switch; requires 0.22µF ceramic decoupling placed adjacent to pin |
| 3 PWM/EN | Dual-function logic control | High = enable fixed-current mode; external PWM signal = pulse-width modulated current control; low = 1µA shutdown |
| 4 NC | No-connect terminal | Must remain unconnected; no internal bond wire or circuit connection |
| 5 FB | Current-sense feedback input | Connects to bottom LED cathode or RSET resistor; 95mV reference sets ILED = 95mV / RSET |
| 6 FBSW | Feedback disconnect switch control | Connected to bottom LED cathode during PWM dimming to prevent FB modulation and output discharge |
| 7 VOUT | Boost output node | Drives top LED anode and output capacitor; rated for 26V max under OVP condition |
| 8 LX | Internal switch drain node | Connects to inductor; switches at 1.4MHz; max voltage rating 28V (absolute max) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reducing BOM count and board area while maintaining >85% efficiency at 25mA |
| 26V factory-trimmed OVP | Matches 7-series white LED string (24.5V typical); prevents overvoltage damage without external components |
| FBSW feedback disconnect switch | Enables true PWM dimming linearity down to 1% duty cycle at 1kHz by isolating FB during off-time |
| Internally compensated control loop | Removes need for external compensation network; simplifies layout and ensures stability with standard LC values |
| 1.4MHz fixed-frequency operation | Permits use of 10µH–22µH shielded inductors and X5R/X7R ceramic capacitors, minimizing EMI and size |
Applications
| Smartphone Backlighting | Automotive Navigation Panel |
|---|---|
Use Scenario: Driving 5–7 white LEDs in a 3.5–5-inch smartphone LCD with dynamic brightness control. IC Role / Device Role / Timing Role: Constant-current boost driver with PWM dimming interface and 26V OVP for full-string protection. Use Value: Enables flicker-free, high-CRI backlighting with <1% dimming resolution and 85% power efficiency at 4V input. | Use Scenario: Powering segmented LED backlight in automotive-grade infotainment display operating from 12V supply with local 3.3V rail. IC Role / Device Role / Timing Role: Compact, thermally robust LED driver supporting -40°C to +85°C ambient with fast EN-to-VOUT response (<200µs). Use Value: Delivers reliable dimming linearity across temperature and input voltage variation without external OVP circuitry. |
| Portable GPS Device | MP3/PMP Display |
Use Scenario: Backlighting monochrome or color TFT in handheld GPS unit powered by single-cell Li-ion battery. IC Role / Device Role / Timing Role: Low-quiescent-current (1µA shutdown) boost driver with wide input range (2.4–5.5V) accommodating battery discharge curve. Use Value: Extends battery runtime while maintaining consistent LED brightness across 2.7–4.2V battery voltage swing. | Use Scenario: Driving 3–4 white LEDs in portable media player with audio-sensitive analog circuitry nearby. IC Role / Device Role / Timing Role: PWM-dimming-capable driver with FBSW switch to suppress conducted noise coupling into audio paths. Use Value: Prevents PWM-induced interference in audio subsystems by eliminating output ripple modulation during dimming off-cycles. |
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 | 18V OVP threshold; supports up to ~5-series LEDs (17.5V typical); higher max LED current (50mA vs 30mA) | Better suited for mid-size panels with fewer LEDs and higher current demand | Select when driving ≤5 white LEDs and requiring higher peak current capability |
| ISL97634IRT14Z-T | 14V OVP threshold; supports up to ~4-series LEDs (14V typical); highest max LED current (70mA) | Optimized for compact displays with short LED strings and high-brightness requirements | Select for 3–4 LED strings where 26V headroom is unnecessary and higher current is needed |
Compared with ISL97634IRT18Z-T and ISL97634IRT14Z-T, the ISL97634IRT26Z-T trades maximum LED current (30mA) for extended output voltage range (26V), making it the only variant capable of safely driving 7-series white LED strings without external cascode MOSFETs.
Availability
ISL97634IRT26Z-T is available at Aetrix Electronics and suitable for smartphone backlighting, automotive navigation panels, portable GPS devices, and MP3/PMP displays requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for ISL97634IRT26Z-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 was engineered specifically for space-constrained, battery-powered LCD backlighting applications demanding high efficiency, wide dimming range, and integrated protection-targeting portable consumer and automotive display markets.
FAQ
What is the exact OVP threshold of the ISL97634IRT26Z-T?
The ISL97634IRT26Z-T has a factory-trimmed overvoltage protection threshold of 26V, with a tolerance of ±2V (26V to 28V). This fixed OVP setting is specific to the "26Z" suffix and is not adjustable. When VOUT reaches this threshold, the LX switch halts until VOUT drops approximately 7% (~1.8V) below the trip point, after which normal operation resumes. This behavior is confirmed in the Electrical Specifications table on page 4 of FN6264 Rev 4.00.
Can the ISL97634IRT26Z-T drive more than seven white LEDs in series?
No-the ISL97634IRT26Z-T is rated for up to 26V output, which corresponds to a maximum of seven standard 3.5V white LEDs (24.5V typical). Attempting to drive eight or more LEDs exceeds the 26V OVP limit and risks triggering continuous OVP latch-off. For higher-voltage strings, Intersil's datasheet (page 9) describes a cascode configuration using an external N-channel MOSFET-but this disables the internal OVP function and requires custom overvoltage protection.
How does the FBSW pin improve dimming linearity in the ISL97634IRT26Z-T?
The FBSW pin in the ISL97634IRT26Z-T controls an internal switch that disconnects the FB node from the LED cathode during PWM off-time. This prevents the output capacitor from discharging through the feedback path, eliminating output voltage droop and preserving accurate current replication across duty cycles. As shown in Figure 14 of FN6264 Rev 4.00, using FBSW enables linear dimming down to <1% at 1kHz, whereas omitting it (Figure 13) causes severe nonlinearity below 10% duty cycle.
What is the recommended inductor value for the ISL97634IRT26Z-T in a 5-LED string application?
For a 5-LED string (≈17.5V VOUT) powered from 3.6V input, Intersil recommends either 10µH or 22µH shielded inductors-both validated in the Typical Application Circuit (Figure 1) and Efficiency Curves (Figure 2). A 22µH inductor yields lower peak current and improved efficiency at medium loads, while 10µH offers faster transient response. Inductor saturation current must exceed 470mA (ILIM max), and DCR should be minimized to maintain >85% efficiency per Figure 2 data.
Does the ISL97634IRT26Z-T require external compensation components?
No-the ISL97634IRT26Z-T features fully internal compensation, as stated in the Features list (page 1) and Detailed Description (page 6). The device is designed to operate stably with standard 10µH–22µH inductors and 0.22µF–1µF ceramic output capacitors without any external RC networks. This eliminates tuning effort and improves design reproducibility across production batches.
ISL97634IRT26Z-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- SEPIC, Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.4V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.45MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
ISL97634IRT26Z-T FAQ
1.How can I place an order for ISL97634IRT26Z-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL97634IRT26Z-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 ISL97634IRT26Z-T reliable?
The price and inventory of ISL97634IRT26Z-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL97634IRT26Z-T is usually 5 days.
3.What payment methods are accepted for ISL97634IRT26Z-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL97634IRT26Z-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL97634IRT26Z-T?
ISL97634IRT26Z-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL97634IRT26Z-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 ISL97634IRT26Z-T?
For technical support, including ISL97634IRT26Z-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL97634IRT26Z-T requirements.
6.How does Aetrix verify that ISL97634IRT26Z-T is sourced from the original manufacturer or authorized distributors?
All ISL97634IRT26Z-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 ISL97634IRT26Z-T meets industry standards.
7.What is the process for return or replacement of ISL97634IRT26Z-T?
All ISL97634IRT26Z-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL97634IRT26Z-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 ISL97634IRT26Z-T part is unused and in its original packaging.
Return procedure for ISL97634IRT26Z-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL97634IRT26Z-T 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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