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Renesas ISL9104AIRUBZ-T
- Part No.:
- ISL9104AIRUBZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104AIRUBZ-T.pdf
- Description:
- IC REG BUCK 1.5V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,061
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Product details
Overview
ISL9104AIRUBZ-T from Intersil is a 500mA, 4.3MHz synchronous buck converter optimized for low-voltage microprocessors in space-constrained portable devices. It delivers fixed 1.5V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrated P/N-channel MOSFETs. It powers core logic in WCDMA handsets and MP3 players requiring high light-load efficiency and ultrasonic switching.
For engineers reviewing the ISL9104AIRUBZ-T datasheet, ISL9104AIRUBZ-T pinout, ISL9104AIRUBZ-T application, or ISL9104AIRUBZ-T equivalent, key selection criteria include its 1.5V fixed output, ultrasonic skip-mode operation (eliminating audible noise), 1.6×1.6mm µTDFN package, and integrated bleeding function for rapid output discharge during shutdown.
Technical Context
The ISL9104AIRUBZ-T employs peak-current-mode PWM control with slope compensation for fast transient response and cycle-by-cycle current limiting. Its internal 0.8V bandgap reference feeds an error amplifier that regulates output by modulating the P-channel MOSFET's on-time via a PWM comparator synchronized to a 4.3MHz oscillator.
Under light load, it enters ultrasonic pulse-skipping mode (PFM) - triggered after 16 consecutive zero-crossing detections at the SW node - reducing switching frequency while maintaining >20kHz operation to avoid audible noise. During shutdown, the internal N-channel bleeding FET (100Ω RDS(on)) actively discharges the output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% over line/load/temperature - enables direct replacement of LDOs without external feedback resistors. |
| Max Output Current | 500mA guaranteed minimum - supports processor cores and memory I/O in compact handhelds without derating. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li⁺ cell (2.7–4.2V), three NiMH cells, or regulated 5V rails. |
| Switching Frequency | 4.3MHz typical (3.6–4.9MHz range) - allows use of 1.0µH inductor and 4.7µF ceramic caps, minimizing PCB area to <0.5cm². |
| Quiescent Current | 84µA typical in skip mode at 1.5V output - extends battery runtime in standby states of mobile phones and PDAs. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, enabling operation down to VIN = VOUT + 0.3V. |
| Shutdown Current | 0.05µA typical - ensures negligible battery drain when disabled in always-on systems. |
| Thermal Shutdown | 130°C threshold with 30°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
ISL9104AIRUBZ-T is housed in a Pb-free, RoHS-compliant 6-pin 1.6mm × 1.6mm µTDFN package (PKG DWG # L6.1.6x1.6) with exposed thermal pad. The package footprint occupies minimal board area and supports high-density layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–6.0V supply; requires local 4.7µF ceramic decoupling to GND for EMI suppression and transient response. |
| EN (Pin 2) | Enable control | Active-high logic input; pulls low to disable regulator and activate internal output capacitor discharge path. |
| NC (Pin 3) | No connect | Internally unconnected; must be left floating per datasheet - no external tie required. |
| FB (Pin 4) | Feedback sense | Internally tied to 1.5V output for fixed-version operation; not accessible for adjustment - eliminates resistor divider layout errors. |
| GND (Pin 5) | Power ground | Primary return path for input/output currents; connects to thermal pad for optimal heat dissipation. |
| SW (Pin 6) | Switching node | Drives external inductor; carries high di/dt pulses - requires short, wide trace routing away from noise-sensitive FB and EN lines. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Operates >20kHz in PFM mode - prevents audible coil whine in earpiece-proximate circuits like WCDMA handsets. |
| Integrated bleeding FET | 100Ω RDS(on) N-channel switch discharges output capacitor rapidly upon EN deactivation - critical for power sequencing in multi-rail systems. |
| Internal digital soft-start | 1.0ms controlled ramp limits inrush current - avoids input rail sag and prevents false UVLO triggering during cold start. |
| Low dropout operation | 100% duty cycle enables regulation down to VIN = VOUT + 0.3V - maximizes usable battery voltage range in Li⁺-powered devices. |
| Overcurrent & thermal protection | Peak current limit (0.75–1.35A) and 130°C thermal shutdown with 30°C hysteresis - ensures robustness under fault conditions without external circuitry. |
Applications
| Mobile Phone Core Power | WCDMA Transceiver Bias |
|---|---|
Use Scenario: Powers ARM-based application processor core in slim smartphones operating from single-cell Li⁺ battery. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.5V at up to 500mA with dynamic load response to CPU DVFS transitions. Use Value: Ultrasonic skip mode eliminates audible noise during standby; 84µA IQ extends talk time by >12% versus non-ultrasonic alternatives. |
Use Scenario: Supplies bias voltage to RF power amplifier stages in 3G WCDMA handsets with tight EMI constraints. IC Role / Device Role / Timing Role: Low-noise, fast-transient buck converter placed near PA module to minimize trace inductance and ripple coupling. Use Value: 4.3MHz switching enables compact 1.0µH inductor placement adjacent to PA; 100% duty cycle sustains output during battery sag below 3.0V. |
| Portable Media Player SoC | Ultra-Compact PDA Logic Rail |
Use Scenario: Generates 1.5V for DSP and codec subsystems in MP3 players where board area is limited to <25mm². IC Role / Device Role / Timing Role: High-efficiency DC-DC converter replacing linear regulators to reduce thermal load in sealed plastic enclosures. Use Value: 1.6×1.6mm µTDFN package and <0.5cm² total solution size enable integration into sub-50mm wide form factors. |
Use Scenario: Powers FPGA-configurable logic and touch controller in palm-sized PDAs with aggressive battery life targets. IC Role / Device Role / Timing Role: Primary system rail converter with enable-controlled sequencing and rapid output discharge for clean sleep/wake transitions. Use Value: Internal bleeding FET reduces output discharge time to <10ms - meets USB suspend/resume timing requirements without external MOSFET. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz switching, 300mA output, 25µA IQ in PFM - lacks ultrasonic operation and bleeding FET. | Suitable for lower-current logic rails but cannot replace ISL9104AIRUBZ-T in noise-sensitive audio-adjacent designs. | Select when cost sensitivity outweighs ultrasonic requirement and output discharge is handled externally. |
| RT8059GJ6 | 2.5MHz, 600mA, 22µA IQ, fixed 1.5V - includes bleed function but no ultrasonic PFM; thermal shutdown at 150°C. | Acceptable for non-audio portable devices needing higher current, but may generate audible noise in quiet environments. | Choose for higher current headroom where audible noise is not a constraint and thermal margin is prioritized. |
Compared with TPS62231DRYR and RT8059GJ6, the ISL9104AIRUBZ-T uniquely combines ultrasonic skip mode, integrated bleeding, and 1.6×1.6mm footprint - making it the only option for space-constrained, noise-critical 1.5V/500mA applications in premium mobile handsets.
Availability
ISL9104AIRUBZ-T is available at Aetrix Electronics and suitable for mobile phone core power, WCDMA transceiver bias, and portable media player SoC applications requiring stable component supply across production lifecycles.
Supply support for ISL9104AIRUBZ-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 leader in high-performance analog semiconductors, specializing in power management and signal processing for mobile, computing, and industrial markets.
The ISL9104AIRUBZ-T belongs to Intersil's ultra-compact synchronous buck converter family, designed specifically for battery-powered handheld devices demanding minimal PCB area, ultrasonic operation, and rapid power sequencing.
FAQ
What is the output voltage tolerance of the ISL9104AIRUBZ-T over temperature and line variation?
The ISL9104AIRUBZ-T provides ±3% output voltage accuracy over the full operating temperature range (−40°C to +85°C) and input line variation (2.7V to 6.0V). This specification applies specifically to the fixed 1.5V version and is guaranteed without external feedback components - ensuring consistent performance across battery discharge cycles and ambient conditions in portable devices.
Does the ISL9104AIRUBZ-T support ultrasonic operation in skip mode, and how is it implemented?
Yes, the ISL9104AIRUBZ-T implements ultrasonic skip mode (PFM) to maintain switching frequencies above 20kHz - eliminating audible coil whine. This is achieved through a dedicated zero-crossing detection circuit monitoring the SW node for 16 consecutive cycles; once confirmed, the SKIP comparator controls pulse timing while preserving synchronization to the 4.3MHz clock base.
How does the ISL9104AIRUBZ-T handle output capacitor discharge during shutdown?
When the EN pin is driven low, the ISL9104AIRUBZ-T activates an internal N-channel bleeding MOSFET (100Ω RDS(on)) between the FB pin and GND. This provides a controlled discharge path for the output capacitor, reducing VOUT to <100mV within 10ms - enabling clean power sequencing and preventing latch-up in downstream logic.
What is the minimum input voltage required for regulation at full 500mA load with the ISL9104AIRUBZ-T?
At 500mA load, the ISL9104AIRUBZ-T maintains regulation down to VIN = VOUT + Vdropout, where Vdropout ≤ 300mV due to its 100% duty-cycle capability and low P-channel RDS(on). Thus, minimum functional input is approximately 1.8V - allowing continued operation deep into Li⁺ battery discharge (down to ~3.0V pack voltage with system losses).
Can the ISL9104AIRUBZ-T be used with ceramic output capacitors, and what value is recommended?
Yes, the ISL9104AIRUBZ-T is optimized for ceramic output capacitors. A 4.7µF/6.3V X5R or X7R ceramic capacitor is recommended - providing low ESR for minimal output ripple (<15mVpp at 500mA) and stable loop response without additional compensation components.
ISL9104AIRUBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 4.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UTDFN (1.6x1.6)
ISL9104AIRUBZ-T FAQ
1.How can I place an order for ISL9104AIRUBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104AIRUBZ-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 ISL9104AIRUBZ-T reliable?
The price and inventory of ISL9104AIRUBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104AIRUBZ-T is usually 5 days.
3.What payment methods are accepted for ISL9104AIRUBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104AIRUBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104AIRUBZ-T?
ISL9104AIRUBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104AIRUBZ-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 ISL9104AIRUBZ-T?
For technical support, including ISL9104AIRUBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104AIRUBZ-T requirements.
6.How does Aetrix verify that ISL9104AIRUBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9104AIRUBZ-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 ISL9104AIRUBZ-T meets industry standards.
7.What is the process for return or replacement of ISL9104AIRUBZ-T?
All ISL9104AIRUBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104AIRUBZ-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 ISL9104AIRUBZ-T part is unused and in its original packaging.
Return procedure for ISL9104AIRUBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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