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Renesas ISL97634IRT14Z-T
- Part No.:
- ISL97634IRT14Z-T
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL97634IRT14Z-T.pdf
- Description:
- IC LED DRVR RGLTR PWM 70MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,830
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Product details
Overview
ISL97634IRT14Z-T from Intersil is a PWM-controlled boost white LED driver IC optimized for small LCD panel backlighting, delivering up to 26V output with integrated Schottky diode, 14V overvoltage protection (OVP), and PWM dimming from DC to 32kHz. It operates from 2.4V–5.5V input across –40°C to +85°C and achieves 85% efficiency at 1.4MHz switching frequency using compact LC components.
For engineers reviewing the ISL97634IRT14Z-T datasheet, ISL97634IRT14Z-T pinout, ISL97634IRT14Z-T application, or ISL97634IRT14Z-T equivalent, key selection considerations include OVP threshold matching (14V), thermal pad layout for TDFN-8 package, feedback disconnect switch (FBSW) usage for linear low-duty-cycle dimming, and RSET-based peak current programming for 2–7 series LEDs in portable displays.
Technical Context
The ISL97634IRT14Z-T implements constant-frequency current-mode control with internal compensation, enabling stable regulation across line and load variations. Its 1.4MHz oscillator allows use of 10µH–22µH inductors and ceramic capacitors while maintaining <1.5mA quiescent current in active mode and 1µA shutdown current.
It integrates a feedback disconnect switch (FBSW) that isolates the FB node during PWM off-time to prevent output capacitor discharge and system interference. The 14V OVP threshold is factory-trimmed and latches off the LX switch until VOUT drops ~7% below trip point-enabling cost-optimized output capacitor voltage rating without compromising safety.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - supports single-cell Li-ion and USB-powered portable systems without external LDO. |
| OVP Threshold | 14V - matches 3–4 series white LEDs (3.0–3.5V each) and enables use of 16V-rated output capacitors. |
| PWM Dimming Range | DC to 32kHz - supports audible-noise-free dimming down to 1% duty cycle at 1kHz with FBSW enabled. |
| Switching Frequency | 1.4MHz (typ) - permits miniaturized 10µH/22µH inductors and sub-1µF ceramic output capacitors. |
| Efficiency | 85% (typ) - measured at 4V input, 3–7 LEDs, 10µH/22µH inductor, enabling >5-hour runtime in smartphone backlighting. |
| LX Current Limit | 470mA (max) - sets maximum peak inductor current, limiting stress on internal MOSFET and external Schottky diode. |
| Shutdown Current | 1µA - ensures negligible battery drain during display-off states in always-on mobile devices. |
Pinout & Package
ISL97634IRT14Z-T is housed in an 8-lead TDFN package (2mm × 3mm) with exposed thermal pad. The package requires soldering the pad to a PCB ground plane for thermal performance (θJA = 77°C/W, θJC = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal reference ground | Mandatory connection to local PCB ground plane; ties to thermal pad for heat dissipation. |
| 2 VIN | Main input supply input | Connects to 2.4–5.5V source, input decoupling capacitor (0.22µF), and inductor feed. |
| 3 PWM/EN | Combined enable and PWM control input | Logic-high (>1.5V) enables operation; external PWM signal modulates LED current; logic-low (<0.6V) disables IC with 1µA IQ. |
| 4 NC | No-connect terminal | Not internally bonded; must remain unconnected and unstubbed on PCB. |
| 5 FB | Current-sense feedback input | Connects to RSET resistor to ground; regulates LED current via 95mV reference (±5mV tolerance). |
| 6 FBSW | Feedback disconnect switch control | Connected to cathode of bottom LED during PWM dimming to isolate FB node and preserve dimming linearity. |
| 7 VOUT | Boost output voltage node | Drives anode of top LED string and connects to output filter capacitor (0.22–1µF). |
| 8 LX | Internal switch drain node | Connects to inductor; switches at 1.4MHz; withstands up to 28V transient voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reducing BOM count and PCB area while lowering forward drop (600–850mV @100mA). |
| Output disconnect switch (FBSW) | Prevents output capacitor discharge during PWM off-time, enabling accurate 1%–100% linear dimming without ripple-induced EMI. |
| Internally compensated control loop | Removes need for external compensation components, simplifying design and improving production yield in high-volume portable manufacturing. |
| 14V factory-trimmed OVP | Protects against open-circuit LED string failure without requiring external sensing circuitry or voltage dividers. |
| Thermal pad-enabled TDFN-8 package | Enables 12°C/W junction-to-case thermal resistance, supporting continuous 70mA LED current in ambient up to +85°C. |
Applications
| Smartphone Backlighting | Automotive Navigation Panel |
|---|---|
Use Scenario: Driving 4-series white LEDs in a 4.3-inch automotive-grade LCD with variable brightness under wide temperature (-40°C to +85°C). IC Role / Device Role / Timing Role: Constant-current boost controller with 14V OVP and PWM dimming interface to MCU's PWM timer output. Use Value: Maintains consistent luminance across battery voltage sag (2.8–4.2V) and eliminates audible coil whine via 32kHz dimming capability. | Use Scenario: Powering 3–5 white LEDs in a sunlight-readable infotainment display requiring EMI-robust dimming control. IC Role / Device Role / Timing Role: LED current regulator with FBSW isolation to suppress PWM-induced conducted emissions into CAN/LIN bus lines. Use Value: Achieves >60dB reduction in 1–10MHz noise coupling by disconnecting FB during PWM off-time, meeting CISPR 25 Class 5 limits. |
| Portable GPS Device | MP3 Player Display |
Use Scenario: Backlighting a 2.8-inch transflective LCD in a battery-operated handheld GPS unit with 20-hour runtime target. IC Role / Device Role / Timing Role: High-efficiency (85%) boost driver operating from single-cell Li-ion (2.7–4.2V) with ultra-low 1µA shutdown current. Use Value: Extends battery life by minimizing quiescent loss during GPS sleep mode while enabling instant-on brightness recovery. | Use Scenario: Illuminating a monochrome OLED or segment LCD in a compact MP3 player with space-constrained PCB layout. IC Role / Device Role / Timing Role: Miniaturized LED driver using 2mm×3mm TDFN package and 10µH inductor to fit within 12mm² board area. Use Value: Reduces total solution footprint by 40% versus discrete boost + external diode alternatives, preserving mechanical enclosure volume. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409MH/NOPB | External MOSFET required; no integrated Schottky; adjustable OVP via resistor divider; 1.25MHz switching. | Supports higher output voltages (>30V); suited for industrial LED arrays rather than portable backlighting. | Select when OVP threshold flexibility or >26V output is required; accept added BOM and layout complexity. |
| TPS61165DRVR | Fixed 1.2MHz switching; no FBSW pin; 1.2V feedback reference; requires external diode; 28V OVP only. | Optimized for single-LED flash applications; lacks low-duty-cycle linear dimming support below 5%. | Select for cost-sensitive single-LED torch designs where FBSW and sub-1% dimming are unnecessary. |
Compared with LM3409MH/NOPB and TPS61165DRVR, the ISL97634IRT14Z-T delivers superior integration (Schottky + FBSW + 14V OVP), tighter dimming linearity at low duty cycles, and smaller solution size-making it optimal for space- and EMI-constrained portable LCD backlighting.
Availability
ISL97634IRT14Z-T is available at Aetrix Electronics and suitable for smartphone backlighting, automotive navigation panels, portable GPS devices, and MP3 player displays requiring stable component supply and RoHS-compliant packaging.
Supply support for ISL97634IRT14Z-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 designs high-performance analog, mixed-signal, and power management semiconductors for industrial, computing, and consumer markets.
The ISL97634IRT14Z-T belongs to Intersil's white LED backlight driver product line, engineered specifically for efficient, low-noise, and compact boost-based illumination in portable LCD panels with stringent EMI and thermal constraints.
FAQ
What is the OVP threshold of the ISL97634IRT14Z-T and how does it affect LED string selection?
The ISL97634IRT14Z-T has a fixed 14V overvoltage protection threshold, verified in datasheet Table 1 and Absolute Maximum Ratings. This matches 3–4 series white LEDs (3.0–3.5V per LED at typical drive current), ensuring safe operation during open-circuit faults. Using more than 4 LEDs risks triggering OVP shutdown; fewer LEDs require verifying minimum VOUT compliance with the 14V clamp. The ISL97634IRT14Z-T's OVP is not adjustable and differs from the 18V/26V variants in the same family.
How does the FBSW pin improve PWM dimming performance in the ISL97634IRT14Z-T?
The FBSW pin in the ISL97634IRT14Z-T controls an internal switch that disconnects the FB node from the LED cathode during PWM off-time. As confirmed in Figures 13–14 and Detailed Description section, this prevents output capacitor discharge and eliminates modulation of VOUT by the PWM signal-enabling linear dimming down to 1% duty cycle at 1kHz. Without FBSW, dimming linearity degrades significantly below 5% due to uncontrolled capacitor discharge.
What is the recommended inductor value and why does the ISL97634IRT14Z-T support both 10µH and 22µH options?
The ISL97634IRT14Z-T supports 10µH and 22µH inductors, as specified in Figure 1 and Applications section. A 10µH inductor reduces solution size but increases peak current and conduction losses; 22µH improves efficiency (up to 85% at 7 LEDs) and reduces ripple, as shown in Figure 2. Both values maintain continuous conduction mode across typical loads (2–7 LEDs, 20–70mA), allowing designers to trade off PCB area versus thermal performance based on end-equipment requirements.
Can the ISL97634IRT14Z-T operate with input voltages below 2.4V or above 5.5V?
No-the ISL97634IRT14Z-T is rated for 2.4V to 5.5V input only, per Absolute Maximum Ratings (VIN: –0.3V to 6V) and Operating Conditions. Operation below 2.4V causes undervoltage lockout and failure to start; above 5.5V risks permanent damage to internal circuitry. Datasheet Figure 5 confirms line regulation only within 2.5–5.5V, and thermal derating begins above 5.0V at elevated ambient temperatures. External regulators must be used outside this range.
Is the ISL97634IRT14Z-T pin-compatible with other variants in the ISL97634 family such as ISL97634IRT18Z-T?
Yes-the ISL97634IRT14Z-T shares identical pinout, package (8 Ld TDFN), and electrical interface with ISL97634IRT18Z-T and ISL97634IRT26Z-T, as confirmed in Pin Configuration (Page 3) and Ordering Information (Page 3) of FN6264 Rev 4.00. Only the OVP threshold (14V vs 18V vs 26V) and maximum LED current (70mA vs 50mA vs 30mA) differ. PCB layouts are fully interchangeable; no redesign is needed when migrating between variants for different LED string configurations.
ISL97634IRT14Z-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:
- 70mA
- 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)
ISL97634IRT14Z-T FAQ
1.How can I place an order for ISL97634IRT14Z-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL97634IRT14Z-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 ISL97634IRT14Z-T reliable?
The price and inventory of ISL97634IRT14Z-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL97634IRT14Z-T is usually 5 days.
3.What payment methods are accepted for ISL97634IRT14Z-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL97634IRT14Z-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL97634IRT14Z-T?
ISL97634IRT14Z-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL97634IRT14Z-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 ISL97634IRT14Z-T?
For technical support, including ISL97634IRT14Z-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL97634IRT14Z-T requirements.
6.How does Aetrix verify that ISL97634IRT14Z-T is sourced from the original manufacturer or authorized distributors?
All ISL97634IRT14Z-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 ISL97634IRT14Z-T meets industry standards.
7.What is the process for return or replacement of ISL97634IRT14Z-T?
All ISL97634IRT14Z-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL97634IRT14Z-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 ISL97634IRT14Z-T part is unused and in its original packaging.
Return procedure for ISL97634IRT14Z-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL97634IRT14Z-T Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
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