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Renesas ISL9104AIRUJZ-T7A
- Part No.:
- ISL9104AIRUJZ-T7A
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104AIRUJZ-T7A.pdf
- Description:
- IC REG BUCK 2.8V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,539
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Product details
Overview
ISL9104AIRUJZ-T7A from Renesas (formerly Intersil) is a 500mA, 4.3MHz synchronous buck DC-DC converter optimized for low-voltage microprocessor power in space-constrained portable devices. It delivers fixed 2.8V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and ultrasonic switching to suppress audible noise - enabling extended battery life in WCDMA handsets and MP3 players.
For engineers reviewing the ISL9104AIRUJZ-T7A datasheet, ISL9104AIRUJZ-T7A pinout, ISL9104AIRUJZ-T7A application, or ISL9104AIRUJZ-T7A equivalent, key selection criteria include its 2.8V fixed output, µTDFN-6 package footprint, ultrasonic PFM mode, internal MOSFETs (0.45Ω/0.4Ω typical RDS(on)), and integrated quick-discharge function on shutdown.
Technical Context
The ISL9104AIRUJZ-T7A employs peak-current-mode PWM control with slope compensation for fast transient response and pulse-by-pulse current limiting. Its architecture integrates P- and N-channel MOSFETs, a 0.8V bandgap reference, and a zero-cross sensing circuit that triggers ultrasonic skip mode after 16 consecutive zero-current cycles.
Under light load, it enters skip mode with ultrasonic frequency modulation (exclusive to ISL9104A variants) to eliminate audible coil whine; under heavy load, it switches to fixed 4.3MHz PWM. The device supports 100% duty cycle for minimal dropout and includes internal digital soft-start, overcurrent protection, thermal shutdown (130°C), and logic-controlled discharge of the output capacitor via an internal bleeding FET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±3% over temperature and line - ensures stable core voltage for baseband processors without external feedback resistors. |
| Max Output Current | 500mA guaranteed minimum - sufficient to power ARM Cortex-M cores or RF transceivers in cellular handsets. |
| 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 nominal (3.6–4.9MHz range) - enables use of 1.0µH inductors and 4.7µF ceramic capacitors, reducing solution size to <0.5cm². |
| Quiescent Current | 20µA typical in skip mode - maximizes battery runtime during standby in always-on mobile applications. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, extending usable battery range down to ~3.1V input for 2.8V output. |
| Shutdown Current | 0.05µA typical - minimizes leakage in system-level power gating schemes. |
Pinout & Package
ISL9104AIRUJZ-T7A is housed in a Pb-free, RoHS-compliant 1.6mm × 1.6mm µTDFN-6 package with wettable flanks, rated MSL-1 and suitable for reflow soldering per IPC/JEDEC J-STD-020.
| 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 internal discharge FET when low to rapidly bleed output capacitor - critical for safe power sequencing. |
| NC (Pin 3) | No connect | Internally unconnected; must be left floating - no external tie required or recommended. |
| FB (Pin 4) | Feedback node | Internally tied to 2.8V regulator output; not accessible for adjustment - eliminates external resistor divider and associated accuracy drift. |
| GND (Pin 5) | Power ground | Primary return path for high-frequency switch current; must be connected to solid ground plane adjacent to SW and VIN pins. |
| SW (Pin 6) | Switching node | Connects to inductor high-side terminal; carries high di/dt square wave - requires short, wide trace and isolation from noise-sensitive nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Eliminates audible coil whine in PFM operation - essential for consumer audio devices like MP3 players and handsets. |
| Integrated P/N-MOSFETs | 0.45Ω/0.4Ω typical RDS(on) reduces conduction loss and removes need for external power switches - cuts BOM count and layout complexity. |
| Quick-output discharge | Internal bleeding FET discharges output capacitor within milliseconds of EN deactivation - prevents residual voltage from interfering with downstream logic sequencing. |
| 100% duty-cycle operation | Enables regulation down to VIN = VOUT + dropout (~3.1V for 2.8V out), extracting maximum energy from aging Li+ cells. |
| Digital soft-start | 1ms controlled ramp limits inrush current into output capacitance - prevents input rail sag and avoids false UVLO triggering during startup. |
Applications
| Mobile Baseband Power | WCDMA Transceiver Supply |
|---|---|
Use Scenario: Powering ARM9/ARM11 application processors and modem subsystems in dual-mode cellular handsets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, tightly regulated 2.8V to processor I/O and memory interfaces. Use Value: Ultrasonic skip mode prevents interference with audio codecs; 20µA IQ extends standby time beyond 72 hours on a 800mAh battery. |
Use Scenario: Supplying RF front-end ICs requiring stable low-noise 2.8V in WCDMA handsets operating at 2.1GHz. IC Role / Device Role / Timing Role: Local point-of-load converter placed near transceiver IC to minimize PCB trace inductance and voltage droop. Use Value: 4.3MHz switching allows compact 1.0µH inductor placement directly adjacent to IC, reducing EMI coupling into RF signal paths. |
| Portable Audio Player Core | Low-Power Sensor Hub |
Use Scenario: Generating main system voltage for flash memory, DACs, and DSP cores in MP3 players with OLED displays. IC Role / Device Role / Timing Role: High-efficiency buck converter operating across full battery discharge curve (4.2V → 2.7V). Use Value: 100% duty cycle maintains regulation until battery reaches 3.1V, increasing usable capacity by ~8% versus non-dropout regulators. |
Use Scenario: Powering ultra-low-power motion sensor fusion hubs (accelerometer + gyroscope + MCU) in wearable fitness trackers. IC Role / Device Role / Timing Role: Always-on supply rail with sub-µA shutdown current and fast wake-up from deep sleep states. Use Value: 0.05µA shutdown current enables multi-week battery life on coin cells; quick-discharge ensures deterministic reset timing. |
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, 1.8–6.5V input, no ultrasonic PFM | Lacks audible-noise suppression; lower current rating limits use in 2G/3G RF sections | Select when cost sensitivity outweighs ultrasonic requirement and load stays ≤300mA. |
| MP2108DQ-LF-Z | 2.5MHz, 600mA, 2.5–5.5V input, no quick-discharge or ultrasonic PFM | Higher current but no output bleed function - requires external circuitry for safe sequencing | Choose for higher output capability where board space permits external discharge FET and RC network. |
Compared with TPS62231DRYR and MP2108DQ-LF-Z, the ISL9104AIRUJZ-T7A uniquely combines 2.8V fixed output, ultrasonic skip mode, integrated discharge, and 500mA capability in a 1.6×1.6mm footprint - making it optimal for noise-sensitive, space-constrained mobile baseband supplies.
Availability
ISL9104AIRUJZ-T7A is available at Aetrix Electronics and suitable for mobile handset power management, portable audio player core supplies, and low-power sensor hub designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9104AIRUJZ-T7A 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 (acquired Intersil in 2017) is a global leader in analog and mixed-signal ICs, specializing in high-efficiency power management solutions for portable and automotive markets.
The ISL9104AIRUJZ-T7A belongs to Renesas' ultra-compact synchronous buck converter family designed specifically for battery-powered handheld devices demanding minimal PCB area, ultralow quiescent current, and silent operation.
FAQ
What is the output voltage tolerance of the ISL9104AIRUJZ-T7A over temperature and line variations?
The ISL9104AIRUJZ-T7A provides a fixed 2.8V output with ±3% accuracy across the full operating temperature range (-40°C to +85°C) and input voltage range (2.7V to 6.0V). This specification is guaranteed in PWM mode and ensures reliable operation for baseband processors and RF ICs without requiring external trimming or calibration. The ISL9104AIRUJZ-T7A achieves this using an internal precision 0.8V bandgap reference and trimmed feedback network.
Does the ISL9104AIRUJZ-T7A support adjustable output voltages?
No, the ISL9104AIRUJZ-T7A is a fixed-output variant configured for 2.8V. Its FB pin is internally connected to the output and not accessible for external resistor-divider configuration. For adjustable versions, refer to ISL9104AIRUAZ-T (ADJ) or ISL9104IRUAZ-T. The ISL9104AIRUJZ-T7A simplifies design by eliminating feedback components while maintaining tight regulation through factory-trimmed internal circuitry.
How does the ultrasonic skip mode in the ISL9104AIRUJZ-T7A differ from standard PFM operation?
The ISL9104AIRUJZ-T7A's ultrasonic skip mode modulates switching pulses above 20kHz (ultrasonic range) during light-load conditions, preventing audible coil whine common in standard PFM converters. This feature is exclusive to ISL9104A variants and is implemented via zero-cross detection and adaptive pulse timing - unlike basic PFM, it avoids sub-harmonic resonance and maintains consistent EMI profile. The ISL9104AIRUJZ-T7A uses this to meet acoustic requirements in consumer handsets and audio players.
What is the purpose of the NC pin on the ISL9104AIRUJZ-T7A, and how should it be handled?
Pin 3 (NC) on the ISL9104AIRUJZ-T7A is a no-connect terminal with no internal connection. It must be left electrically floating - neither tied to GND nor VIN. This pin exists for mechanical symmetry and package compatibility across the ISL9104/ISL9104A family. Leaving it unconnected ensures correct thermal and electrical behavior; routing or soldering to any net may compromise reliability or violate absolute maximum ratings.
Can the ISL9104AIRUJZ-T7A operate with a 2.5V input supply?
Yes, the ISL9104AIRUJZ-T7A supports input voltages as low as 2.7V per its absolute minimum rating - operation at 2.5V is outside specification and not guaranteed. At 2.7V input, the device maintains 2.8V output only in 100% duty-cycle mode with increased dropout voltage; efficiency drops significantly below 2.7V. For systems requiring true 2.5V operation, consider ISL9104AIRUDZ-T (2.0V fixed) or ISL9104AIRUCZ-T (1.8V fixed). The ISL9104AIRUJZ-T7A is validated for 2.7–6.0V inputs only.
ISL9104AIRUJZ-T7A 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):
- 2.8V
- 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)
ISL9104AIRUJZ-T7A FAQ
1.How can I place an order for ISL9104AIRUJZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104AIRUJZ-T7A 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 ISL9104AIRUJZ-T7A reliable?
The price and inventory of ISL9104AIRUJZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104AIRUJZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9104AIRUJZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104AIRUJZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104AIRUJZ-T7A?
ISL9104AIRUJZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104AIRUJZ-T7A 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 ISL9104AIRUJZ-T7A?
For technical support, including ISL9104AIRUJZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104AIRUJZ-T7A requirements.
6.How does Aetrix verify that ISL9104AIRUJZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9104AIRUJZ-T7A 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 ISL9104AIRUJZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9104AIRUJZ-T7A?
All ISL9104AIRUJZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104AIRUJZ-T7A, 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 ISL9104AIRUJZ-T7A part is unused and in its original packaging.
Return procedure for ISL9104AIRUJZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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