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Renesas ISL9104AIRUNZ-T
- Part No.:
- ISL9104AIRUNZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104AIRUNZ-T.pdf
- Description:
- IC REG BUCK 3.3V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,863
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Product details
Overview
ISL9104AIRUNZ-T from Renesas Electronics (formerly Intersil) is a 500mA, 4.3MHz synchronous buck DC-DC converter optimized for low-voltage microprocessor power in compact battery-powered devices. It delivers fixed 3.3V output with ±3% accuracy, operates from 2.7V–6.0V input, achieves up to 93% efficiency, and features ultrasonic skip mode (≤20 kHz) to eliminate audible noise - ideal for WCDMA handsets and portable instruments.
For engineers reviewing the ISL9104AIRUNZ-T datasheet, ISL9104AIRUNZ-T pinout, ISL9104AIRUNZ-T application, or ISL9104AIRUNZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed light-load efficiency behavior (20 µA quiescent current), and real-world substitution guidance for fixed-output 3.3V buck converters in space-constrained Li-ion systems.
Technical Context
The ISL9104AIRUNZ-T employs peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its 4.3MHz fixed-frequency operation under heavy load enables use of a 1.0µH inductor and 4.7µF ceramic capacitors, minimizing PCB footprint to <0.5 cm².
Under light load, it automatically enters ultrasonic skip mode (PFM) - a feature exclusive to the ISL9104A variant - where switching frequency drops below 20 kHz while maintaining inaudible operation. The device integrates matched P-Channel (0.45 Ω typ) and N-Channel (0.4 Ω typ) MOSFETs and supports 100% duty-cycle low-dropout operation with <300 mV dropout at 500 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over line, load, and temperature - eliminates external feedback resistors and ensures stable rail for RF front-end or baseband ICs. |
| Max Output Current | 500mA guaranteed minimum - sufficient to power ARM Cortex-M cores, PMIC subsystems, or dual-band transceivers without derating. |
| Input Voltage Range | 2.7V to 6.0V - supports single Li-ion (2.7–4.2V), three NiMH cells, or regulated 5V supplies without external pre-regulation. |
| Switching Frequency | 4.3MHz typical (3.6–4.9MHz range) - enables use of tiny 1.0µH inductors and reduces EMI filter size versus 1–2MHz alternatives. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby states for always-on sensors or Bluetooth LE modules. |
| Shutdown Current | <1µA logic-controlled - ensures negligible drain during deep sleep or system off modes in portable equipment. |
| Duty Cycle | 100% maximum - maintains regulation down to VIN = VOUT + dropout (e.g., 3.6V input sustains 3.3V output at full load). |
Pinout & Package
ISL9104AIRUNZ-T is housed in a RoHS-compliant, Pb-free 6-pin µTDFN package measuring 1.6mm × 1.6mm × 0.55mm (L6.1.6x1.6 drawing), optimized for thermal performance (θJA = 160°C/W) and high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Primary power input | Accepts 2.7–6.0V; requires local 4.7µF ceramic decoupling to minimize high-frequency switching noise injection into source rail. |
| EN (Pin 2) | Logic-enable control | Active-high (1.4V min); pulls internal discharge FET to bleed output capacitor when driven low - critical for safe power sequencing. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating - not tied to GND or any voltage to avoid parametric shift or latch-up risk. |
| SW (Pin 4) | Power switch node | Connects to inductor's high-side terminal; carries high di/dt square wave - requires short, wide trace routing away from sensitive analog nodes. |
| GND (Pin 5) | Power ground reference | Primary return path for input/output currents and internal MOSFETs; must connect directly to solid ground plane beneath IC footprint. |
| FB (Pin 6) | Feedback reference | Internally tied to 3.3V output for fixed version - no external divider needed; connects to error amplifier for regulation loop closure. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Exclusive to ISL9104A variants: eliminates audible coil whine (<20 kHz) during light-load operation while maintaining >85% efficiency at 1 mA. |
| Integrated synchronous MOSFETs | P-Channel (0.45 Ω typ) + N-Channel (0.4 Ω typ) switches reduce conduction loss and eliminate need for external catch diode. |
| Internal digital soft-start | 1.0ms controlled ramp prevents inrush current - avoids input rail collapse during cold boot of multi-rail systems. |
| Output capacitor discharge | Active bleeding via internal N-MOSFET when EN = low - discharges output to <100mV within 1ms, enabling safe hot-swap or reset sequencing. |
| Overtemperature protection | Thermal shutdown at 130°C (typ) with 30°C hysteresis - auto-restarts at 100°C, preventing permanent damage during sustained overload or poor airflow. |
Applications
| WCDMA Handset Power Rail | Portable Instrument Core Supply |
|---|---|
Use Scenario: Powers baseband processor and RF transceiver in 3G mobile handsets operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, low-noise 3.3V to mixed-signal SoC with tight transient response. Use Value: Ultrasonic skip mode prevents audible noise during standby; 4.3MHz switching minimizes inductor size for ultra-thin form factors. |
Use Scenario: Supplies FPGA configuration logic and sensor interface circuitry in handheld test equipment. IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable 3.3V rail with fast load-step recovery for digital I/O buffers. Use Value: 500mA capability supports burst-mode acquisition; 100% duty cycle maintains regulation as battery discharges to 3.4V. |
| MP3 Player Audio Codec Supply | PDAs System Management Unit |
Use Scenario: Generates low-noise 3.3V for stereo DAC/ADC and headphone amplifier in battery-powered audio players. IC Role / Device Role / Timing Role: High-efficiency DC-DC stage preceding LDO post-regulator to minimize thermal load on audio subsystem. Use Value: 93% peak efficiency extends playback time; 20µA quiescent current preserves battery during pause mode. |
Use Scenario: Powers real-time clock, touch controller, and memory interface in palm-sized PDAs with limited board area. IC Role / Device Role / Timing Role: Compact, integrated buck regulator replacing discrete solutions to meet strict height and thermal constraints. Use Value: 1.6×1.6mm µTDFN footprint saves >40% board space vs. comparable SOIC-8 converters; RoHS-compliant for global compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRYR | 3.3V fixed, 400mA max, 3.6MHz, 22µA IQ - lacks ultrasonic skip mode and 100% duty cycle. | Suitable for lower-current applications; cannot sustain 3.3V output below 3.6V input due to 90% max duty cycle. | Select if cost sensitivity outweighs ultrasonic noise requirement and load current stays ≤400mA. |
| Analog Devices ADP2108AUJZ-3.3-R7 | 3.3V fixed, 600mA max, 3MHz, 25µA IQ - includes PFM/PWM auto-mode but no dedicated ultrasonic optimization. | Better current headroom; higher inductor size and slightly reduced light-load efficiency vs. ISL9104AIRUNZ-T. | Prefer when higher output current margin is required and audible noise is mitigated by mechanical shielding. |
Compared with TPS62231DRYR and ADP2108AUJZ-3.3-R7, the ISL9104AIRUNZ-T uniquely combines ultrasonic skip mode, 100% duty cycle, and 500mA capability in a 1.6mm² package - making it optimal for noise-sensitive, space-constrained Li-ion systems requiring robust low-input-voltage regulation.
Availability
ISL9104AIRUNZ-T is available at Aetrix Electronics and suitable for WCDMA handset design, portable instrumentation, MP3 player power management, and PDA system supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for ISL9104AIRUNZ-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
Renesas Electronics Corporation (acquired Intersil in 2017) designs high-performance analog and power management ICs for mobile, industrial, and automotive markets, with ISO9001-certified manufacturing and global distribution.
The ISL9104AIRUNZ-T belongs to Renesas' ultra-compact synchronous buck converter family targeting battery-powered handheld devices - engineered for minimal PCB area, ultrasonic noise suppression, and seamless integration into tight-layout consumer electronics.
FAQ
What is the key differentiator of ISL9104AIRUNZ-T versus the standard ISL9104IRUNZ-T?
The ISL9104AIRUNZ-T incorporates ultrasonic skip mode - a feature absent in the ISL9104IRUNZ-T - which suppresses audible coil whine by keeping switching frequency below 20 kHz during light-load operation. This makes ISL9104AIRUNZ-T preferred for noise-critical applications like handsets and audio players, while both share identical pinout, 3.3V fixed output, and 500mA rating.
Does ISL9104AIRUNZ-T require external feedback resistors for its 3.3V output?
No. The ISL9104AIRUNZ-T is a fixed-output variant: its FB pin is internally connected to the 3.3V output, eliminating the need for external resistor dividers. This simplifies layout, improves accuracy (±3% over temperature), and reduces BOM count - unlike adjustable versions such as ISL9104AIRUAZ-T that require R1/R2 networks.
How does the quick bleeding function operate in ISL9104AIRUNZ-T?
When the EN pin is driven low, ISL9104AIRUNZ-T activates an internal N-channel MOSFET between the SW node and GND, discharging the output capacitor through the inductor. This brings VOUT to <100mV within 1ms, enabling safe power sequencing, hot-swap compatibility, and rapid system reset - a critical feature for portable devices with multiple power domains.
What is the minimum input voltage required for ISL9104AIRUNZ-T to maintain 3.3V output at full 500mA load?
At 500mA, ISL9104AIRUNZ-T achieves <300mV dropout voltage due to its 100% duty-cycle capability and low RDS(ON) P-MOSFET (0.45Ω typ). Thus, it sustains regulation down to VIN ≈ 3.6V - e.g., a single Li-ion cell at 30% state-of-charge (3.5–3.6V) can still deliver full-rated output without brownout.
Can ISL9104AIRUNZ-T be used with ceramic output capacitors smaller than 4.7µF?
While 4.7µF is the recommended value per the datasheet for optimal transient response and stability, ISL9104AIRUNZ-T remains stable with ≥2.2µF X5R/X7R ceramics - provided ESR stays <10mΩ and capacitance tolerance accounts for DC bias derating. However, reducing below 4.7µF increases output ripple and may degrade load-step recovery in high-dynamic applications.
ISL9104AIRUNZ-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):
- 3.3V
- 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)
ISL9104AIRUNZ-T FAQ
1.How can I place an order for ISL9104AIRUNZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104AIRUNZ-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 ISL9104AIRUNZ-T reliable?
The price and inventory of ISL9104AIRUNZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104AIRUNZ-T is usually 5 days.
3.What payment methods are accepted for ISL9104AIRUNZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104AIRUNZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104AIRUNZ-T?
ISL9104AIRUNZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104AIRUNZ-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 ISL9104AIRUNZ-T?
For technical support, including ISL9104AIRUNZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104AIRUNZ-T requirements.
6.How does Aetrix verify that ISL9104AIRUNZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9104AIRUNZ-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 ISL9104AIRUNZ-T meets industry standards.
7.What is the process for return or replacement of ISL9104AIRUNZ-T?
All ISL9104AIRUNZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104AIRUNZ-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 ISL9104AIRUNZ-T part is unused and in its original packaging.
Return procedure for ISL9104AIRUNZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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