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Renesas ISL9104AIRUWZ-T7A
- Part No.:
- ISL9104AIRUWZ-T7A
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104AIRUWZ-T7A.pdf
- Description:
- IC REG BUCK 1.2V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:205
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Product details
Overview
ISL9104AIRUWZ-T7A from Renesas (formerly Intersil) is a 500mA, 4.3MHz synchronous buck converter optimized for low-voltage microprocessor power in compact battery-powered devices. It delivers a fixed 1.2V 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 is used in WCDMA handsets and portable instruments requiring high light-load efficiency.
For engineers reviewing the ISL9104AIRUWZ-T7A datasheet, ISL9104AIRUWZ-T7A pinout, ISL9104AIRUWZ-T7A application, or ISL9104AIRUWZ-T7A equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives with functional distinctions, and supply-chain support details specific to this 1.2V fixed-output, ultrasonic-capable µTDFN variant.
Technical Context
The ISL9104AIRUWZ-T7A implements 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 1.0µH inductors and 4.7µF ceramic capacitors, minimizing PCB area.
Under light load, it automatically enters ultrasonic skip mode (PFM) - exclusive to the ISL9104A family - suppressing audible noise while maintaining typical 20µA quiescent current. A zero-crossing detection circuit monitors 16 consecutive SW node cycles to initiate skip mode, and internal digital soft-start prevents inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±3% over line, load, and temperature - eliminates external feedback resistors and ensures stable core voltage for low-power MCUs. |
| Max Output Current | 500mA guaranteed minimum - supports single-core ARM Cortex-M processors and baseband ICs in handheld devices. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li+ cells (2.7–4.2V), three NiMH cells (~3.6V), or regulated 5V rails. |
| Switching Frequency | 4.3MHz (3.6–4.9MHz range) - enables ultra-compact 1.0µH inductor and 0.5cm² total solution size. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby/sleep states of portable electronics. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, sustaining regulation down to VIN = VOUT + 300mV. |
| Shutdown Current | <1µA logic-controlled shutdown - isolates load completely during system deep-sleep modes. |
| Package | 6-pin 1.6mm × 1.6mm µTDFN - RoHS-compliant, MSL3, thermal resistance θJA = 160°C/W. |
Pinout & Package
The ISL9104AIRUWZ-T7A is housed in a 1.6mm × 1.6mm, 0.5mm height, 6-pin µTDFN package (PKG DWG # L6.1.6x1.6) with exposed thermal pad. Pin 1 is marked by a dot; top-view orientation matches datasheet Figure on Page 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Primary input power rail | Accepts 2.7–6.0V; requires local 4.7µF ceramic decoupling to GND to suppress switching noise and stabilize input impedance. |
| EN (Pin 2) | Logic-enable control input | Active-high (≥1.4V); pulls internal discharge FET to bleed output capacitor when driven low - enables clean power sequencing. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating - no external tie or pull-up/down required. |
| FB (Pin 4) | Feedback reference node | Internally tied to 0.8V bandgap; for fixed-output variants like ISL9104AIRUWZ-T7A, directly connected to output - no external divider needed. |
| GND (Pin 5) | Power and signal ground reference | Must be connected to low-impedance PCB ground plane; shares thermal pad connection to maximize heat dissipation. |
| SW (Pin 6) | Switching node | Drives external inductor; carries high di/dt pulses - requires short, wide trace routing away from noise-sensitive nodes (e.g., FB). |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Exclusive to ISL9104A family - eliminates audible coil whine in portable audio devices by shifting PFM frequency above 20kHz. |
| Integrated MOSFETs | P-Channel (0.45Ω typ @ 3.6V) + N-Channel (0.4Ω typ @ 3.6V) switches - reduce BOM count, improve efficiency, and eliminate gate-drive complexity. |
| Output capacitor discharge | Internal bleeding FET activated on EN low - discharges VOUT to safe levels within milliseconds, meeting IEC 62368-1 touch-safe requirements. |
| 100% duty-cycle operation | Enables LDO-like behavior near input dropout - maintains regulation with VIN as low as 1.5V for 1.2V output, extending usable battery range. |
| Digital soft-start | 1ms controlled ramp - limits inrush current to <1.2A, preventing input rail collapse and avoiding false UVLO triggering during startup. |
| Comprehensive protection | Includes peak current limiting (1.0A typ), thermal shutdown (130°C), undervoltage lockout (2.5V), and short-circuit foldback - enables robust field operation without external supervision. |
Applications
| Mobile Handset Power | Portable Instrument Core Supply |
|---|---|
|
Use Scenario: Powering RF transceiver and application processor cores in WCDMA/UMTS handsets operating from single Li-ion cells. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.2V at up to 500mA with dynamic load response to burst-mode transmission. Use Value: Ultrasonic skip mode prevents audible noise during voice calls; 20µA IQ maximizes standby time between transmissions. |
Use Scenario: Supplying FPGA configuration logic and sensor interface ASICs in handheld test equipment with intermittent usage patterns. IC Role / Device Role / Timing Role: Always-on auxiliary rail that remains active during sleep, enabling instant wake-up and fast measurement initialization. Use Value: <1µA shutdown current and 100% duty cycle allow operation down to 1.5V VIN, extracting full energy from depleted batteries. |
| MP3 Player Baseband IC | PDA Application Processor |
|
Use Scenario: Generating 1.2V core voltage for audio DSP and Bluetooth baseband ICs in flash-based MP3 players. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter synchronized to audio playback state transitions (play/pause/stop). Use Value: 4.3MHz switching allows use of tiny 1.0µH inductors, reducing solution footprint to <0.5cm² - critical for thin form factors. |
Use Scenario: Powering ARM9/ARM11 application processors in PDAs with dynamic voltage scaling requirements. IC Role / Device Role / Timing Role: Main system regulator supporting rapid load transients during GUI rendering and multitasking. Use Value: Peak-current-mode control delivers <50µs response to 100mA load steps, minimizing output voltage droop during CPU bursts. |
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 | Fixed 1.2V output, 4MHz switching, 30µA IQ in PFM, no ultrasonic mode, 0.5mm pitch 6-pin WSON. | Lacks ultrasonic skip mode - may generate audible noise in audio-sensitive designs; slightly higher IQ reduces battery life in long-idle scenarios. | Choose when cost sensitivity outweighs acoustic performance and 10µA IQ advantage is non-critical. |
| RT8059NGE | Fixed 1.2V output, 3MHz switching, 22µA IQ, no ultrasonic mode, 6-pin DFN (2mm×2mm). | Larger 2mm×2mm package increases PCB area by 56%; no ultrasonic capability; lower switching frequency requires larger inductor. | Prefer only if legacy board space accommodates larger footprint and acoustic noise is not a concern. |
Compared with TPS62231DRYR and RT8059NGE, the ISL9104AIRUWZ-T7A uniquely combines ultrasonic skip mode, 1.6mm×1.6mm footprint, and 20µA IQ - making it the optimal choice for space-constrained, battery-powered audio and communication devices where silent operation and extended runtime are mandatory.
Availability
ISL9104AIRUWZ-T7A is available at Aetrix Electronics and suitable for mobile handset power, portable instrument core supply, MP3 player baseband IC, and PDA application processor applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ISL9104AIRUWZ-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 Corporation (acquired Intersil in 2017) is a global leader in microcontrollers, analog, and power management semiconductors, serving automotive, industrial, and consumer markets with high-reliability solutions.
The ISL9104A product line was designed specifically for ultra-compact, battery-powered portable electronics - emphasizing ultrasonic operation, minimal quiescent current, and seamless integration with Li+-based power architectures.
FAQ
What is the output voltage tolerance of the ISL9104AIRUWZ-T7A across temperature and line conditions?
The ISL9104AIRUWZ-T7A provides a fixed 1.2V output with ±3% accuracy over the full operating range of -40°C to +85°C ambient temperature and 2.7V to 6.0V input voltage. This specification is guaranteed per the datasheet's "Output Voltage Accuracy (for fixed output voltage only)" parameter, ensuring reliable core voltage delivery for sensitive digital loads without external trimming.
Does the ISL9104AIRUWZ-T7A support 100% duty-cycle operation, and what is its practical dropout voltage?
Yes, the ISL9104AIRUWZ-T7A supports 100% duty-cycle operation, enabling LDO-like behavior when input voltage approaches output level. At 500mA load, the dropout voltage is less than 300mV - calculated as ILOAD × RDS(ON)_PCH - allowing regulation down to VIN = 1.5V for a 1.2V output, which maximizes usable battery capacity.
How does the ultrasonic skip mode in the ISL9104AIRUWZ-T7A differ from standard PFM operation?
The ISL9104AIRUWZ-T7A's ultrasonic skip mode shifts switching frequency above 20kHz during light-load operation - unlike standard PFM converters that fall into audible range (2–20kHz). This eliminates coil whine in audio-sensitive applications such as handsets and MP3 players, while retaining the 20µA quiescent current benefit of skip-mode efficiency.
What protection features are integrated into the ISL9104AIRUWZ-T7A?
The ISL9104AIRUWZ-T7A integrates overcurrent protection (1.0A peak limit), thermal shutdown (130°C trip, 30°C hysteresis), undervoltage lockout (2.5V), short-circuit foldback, and logic-controlled output capacitor discharge. These features enable autonomous, robust operation in unattended portable systems without external supervision circuitry.
Can the ISL9104AIRUWZ-T7A be used with a 1.0µH inductor and 4.7µF ceramic capacitors as recommended?
Yes - the ISL9104AIRUWZ-T7A is fully characterized and optimized for use with a 1.0µH shielded inductor (e.g., KEMET LB3218-T1R0MK) and 4.7µF X5R/X7R ceramic capacitors (e.g., Murata GRM188R60J475KE19D) on both input and output. This combination achieves >90% efficiency at 3.6VIN/1.2VOUT/300mA and fits within <0.5cm² total PCB area.
ISL9104AIRUWZ-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):
- 1.2V
- 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)
ISL9104AIRUWZ-T7A FAQ
1.How can I place an order for ISL9104AIRUWZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104AIRUWZ-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 ISL9104AIRUWZ-T7A reliable?
The price and inventory of ISL9104AIRUWZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104AIRUWZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9104AIRUWZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104AIRUWZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104AIRUWZ-T7A?
ISL9104AIRUWZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104AIRUWZ-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 ISL9104AIRUWZ-T7A?
For technical support, including ISL9104AIRUWZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104AIRUWZ-T7A requirements.
6.How does Aetrix verify that ISL9104AIRUWZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9104AIRUWZ-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 ISL9104AIRUWZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9104AIRUWZ-T7A?
All ISL9104AIRUWZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104AIRUWZ-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 ISL9104AIRUWZ-T7A part is unused and in its original packaging.
Return procedure for ISL9104AIRUWZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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