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Renesas ISL9104AIRUCZ-T7A
- Part No.:
- ISL9104AIRUCZ-T7A
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104AIRUCZ-T7A.pdf
- Description:
- IC REG BUCK 1.8V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,849
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Product details
Overview
ISL9104AIRUCZ-T7A from Renesas Electronics (formerly Intersil) is a 500mA, 4.3MHz synchronous buck converter optimized for low-voltage microprocessor power in compact battery-powered devices. It delivers fixed 1.8V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrated P/N-channel MOSFETs - enabling high-efficiency power delivery in mobile phones and WCDMA handsets.
For engineers reviewing the ISL9104AIRUCZ-T7A datasheet, ISL9104AIRUCZ-T7A pinout, ISL9104AIRUCZ-T7A application, or ISL9104AIRUCZ-T7A equivalent, key selection considerations include ultrasonic skip-mode operation (eliminating audible noise), 1.6×1.6mm µTDFN package footprint, fixed 1.8V output with ±3% regulation accuracy, and integrated quick-output-capacitor discharge on disable.
Technical Context
The ISL9104AIRUCZ-T7A implements peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its architecture integrates a 0.8V bandgap reference, transconductance error amplifier, and zero-cross sensing circuit to enable automatic transition between fixed-frequency 4.3MHz PWM mode (heavy load) and ultrasonic pulse-skipping (PFM) mode (light load).
It supports low-dropout operation via 100% duty cycle, uses internal digital soft-start to limit inrush current, and incorporates dedicated protection blocks: overcurrent protection (OCP) triggered at 0.75–1.35A P-MOSFET peak current, short-circuit protection (SCP) via FB voltage monitoring, thermal shutdown at +130°C, and undervoltage lockout at 2.5–2.7V with 50–150mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% over temperature and line - ensures stable core voltage for 1.8V logic rails without external feedback resistors. |
| Switching Frequency | 4.3MHz typical (3.6–4.9MHz range) - enables use of 1.0µH inductor and 4.7µF ceramic capacitors, minimizing PCB area to <0.5cm². |
| Quiescent Current | 20µA typical in skip mode - maximizes battery runtime in standby/low-power states of portable equipment. |
| Shutdown Current | <1µA logic-controlled - reduces system leakage during deep sleep or power-off sequences. |
| Efficiency | Up to 93% at 500mA - achieved via low RDS(on) P-MOSFET (0.45Ω typ) and N-MOSFET (0.4Ω typ), reducing conduction losses. |
| Duty Cycle | 100% maximum - supports ultra-low dropout (<300mV at 500mA), extending usable battery life down to ~2.1V input. |
| Ultrasonic Skip Mode | Enabled only in ISL9104A variants - suppresses audible coil whine by operating PFM above 20kHz, critical for consumer audio-sensitive applications. |
Pinout & Package
ISL9104AIRUCZ-T7A is housed in a Pb-free, RoHS-compliant 6-pin 1.6×1.6mm µTDFN package with exposed thermal pad (L6.1.6x1.6 drawing). The package supports high thermal conductivity mounting and occupies minimal board space.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 2.7–6.0V; requires local 4.7µF ceramic decoupling to minimize switching noise injection into source rail. |
| EN (Pin 2) | Enable control input | Active-high logic interface; pulls internal discharge FET when low to rapidly bleed output capacitor - essential for safe power sequencing. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating - not tied to GND or other signals to avoid parasitic coupling. |
| FB (Pin 4) | Feedback reference node | Internally connected to 1.8V output for fixed-version operation; no external divider required - simplifies layout and improves regulation stability. |
| GND (Pin 5) | Power ground return | Primary ground reference for IC core, power switches, and feedback loop - must be tied directly to solid ground plane under thermal pad. |
| SW (Pin 6) | Switching node | Connects to inductor high-side; carries high di/dt square wave - requires short, wide trace routing away from sensitive analog nodes like FB. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip-mode operation | Eliminates audible noise in battery-powered audio devices by restricting PFM frequency >20kHz - exclusive to ISL9104A family. |
| Integrated quick-bleed function | Discharges output capacitor through internal N-MOSFET when EN is low - prevents residual voltage from interfering with downstream power-up timing. |
| Internal digital soft-start | Controls output ramp rate to limit inrush current and prevent input rail sag during startup - no external components needed. |
| 100% duty-cycle low-dropout mode | Maintains regulation as input drops to VOUT + ILOAD × RDS(on) - extends usable battery range beyond conventional buck limits. |
| Peak-current-mode PWM control | Provides inherent cycle-by-cycle current limiting and fast transient response - critical for CPU load-step demands in mobile SoCs. |
Applications
| Mobile Phone Core Power | WCDMA Handset RF Front-End |
|---|---|
Use Scenario: Powering application processor cores requiring stable 1.8V supply with rapid load transients during burst-mode cellular transmission. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 1.8V from single Li-ion cell (2.7–4.2V). Use Value: 4.3MHz switching and peak-current-mode control ensure <50mV output deviation during 0–500mA load steps, while 20µA skip-mode IQ preserves standby battery life. | Use Scenario: Supplying bias voltage to power amplifiers and transceiver ICs in 3G WCDMA handsets where EMI and acoustic noise are critical. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing clean, low-noise 1.8V rail with ultrasonic skip mode enabled. Use Value: Ultrasonic PFM operation prevents audible coil whine during voice calls, and integrated soft-start avoids RF stage disruption during power-on sequencing. |
| Portable Instrument Sensor Bias | PDA Application Processor Rail |
Use Scenario: Generating precision 1.8V bias for low-power MEMS sensors and ADC front-ends in handheld test equipment. IC Role / Device Role / Timing Role: High-accuracy, low-noise power source with ±3% output regulation and minimal ripple. Use Value: 93% peak efficiency and <300mV dropout at full load extend battery runtime in field-deployed instruments, while quick-bleed ensures safe sensor power-down. | Use Scenario: Supplying main logic voltage to ARM-based processors in palm-sized PDAs with tight PCB area constraints. IC Role / Device Role / Timing Role: Compact, integrated buck converter occupying <0.5cm² total solution area including inductor and capacitors. Use Value: 1.6×1.6mm µTDFN package and 1.0µH inductor enable ultra-thin form factors, while 100% duty cycle supports operation down to 2.1V battery voltage. |
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 frequency, 300mA output, 1.8V fixed, 17µA IQ - smaller current rating and lower frequency limit inductor size flexibility. | Lacks ultrasonic skip mode and quick-bleed function - unsuitable for audio-sensitive or strict power-sequencing designs. | Select when cost sensitivity outweighs need for 500mA capability or ultrasonic operation. |
| MP2101DQ-LF-Z | 2.5MHz switching, 600mA output, 1.8V fixed, 25µA IQ - higher current but no ultrasonic PFM or integrated bleed FET. | Thermal resistance (θJA = 200°C/W) exceeds ISL9104AIRUCZ-T7A's 160°C/W - less suitable for sustained 500mA in compact enclosures. | Prefer for higher-current margin where audible noise and fast discharge are non-critical. |
Compared with TPS62231DRYR and MP2101DQ-LF-Z, ISL9104AIRUCZ-T7A uniquely combines 500mA capability, ultrasonic skip mode, and integrated output discharge in a 1.6×1.6mm package - making it optimal for space-constrained, audio-aware mobile applications demanding robust power sequencing.
Availability
ISL9104AIRUCZ-T7A is available at Aetrix Electronics and suitable for mobile phone core power, WCDMA handset RF front-end, portable instrument sensor bias, and PDA application processor rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9104AIRUCZ-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 is a global leader in high-performance analog and power management semiconductors, with heritage from Intersil's precision DC-DC innovation.
The ISL9104A product line was designed specifically for ultra-compact, battery-powered handheld devices requiring high efficiency at light loads, ultrasonic noise suppression, and seamless power sequencing - targeting mobile communications and portable instrumentation markets.
FAQ
What is the output voltage tolerance of the ISL9104AIRUCZ-T7A over temperature and line conditions?
The ISL9104AIRUCZ-T7A provides a fixed 1.8V output with ±3% regulation 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 applies to all production units - ensuring reliable core voltage delivery for 1.8V logic systems without external trimming.
Does the ISL9104AIRUCZ-T7A support ultrasonic skip-mode operation?
Yes, the ISL9104AIRUCZ-T7A - as an ISL9104A-series device - includes ultrasonic skip-mode functionality that restricts pulse-frequency modulation to frequencies above 20kHz. This eliminates audible coil whine in mobile phones and audio-sensitive portable equipment, distinguishing it from the base ISL9104 variants which operate in audible-range PFM.
How does the ISL9104AIRUCZ-T7A handle output capacitor discharge during shutdown?
When the EN pin is driven low, the ISL9104AIRUCZ-T7A activates an internal N-channel bleeding MOSFET (RDS(on) ≈ 100Ω) to discharge the output capacitor rapidly. This ensures the output falls below 0.5V within milliseconds, preventing back-powering of downstream circuitry and supporting safe, controlled power-down sequencing in multi-rail systems.
What is the minimum input voltage required for the ISL9104AIRUCZ-T7A to maintain 1.8V output at 500mA?
Under 100% duty-cycle dropout operation, the minimum input voltage is calculated as VOUT + ILOAD × RDS(on)(P-MOSFET). With 500mA load and typical RDS(on) of 0.45Ω at 3.6V input, the dropout voltage is ~225mV - so ISL9104AIRUCZ-T7A sustains regulation down to approximately 2.025V input, extending usable battery life beyond conventional buck limits.
Can the ISL9104AIRUCZ-T7A be used with an adjustable output configuration?
No - the ISL9104AIRUCZ-T7A is a fixed 1.8V output variant. Its FB pin is internally connected to the 1.8V output node; external resistor dividers are neither required nor supported. For adjustable operation, select ISL9104AIRUAZ-T (ADJ marking) instead, which disables the internal divider and exposes FB for external feedback network configuration.
ISL9104AIRUCZ-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):
- 1.8V
- 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)
ISL9104AIRUCZ-T7A FAQ
1.How can I place an order for ISL9104AIRUCZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104AIRUCZ-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 ISL9104AIRUCZ-T7A reliable?
The price and inventory of ISL9104AIRUCZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104AIRUCZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9104AIRUCZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104AIRUCZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104AIRUCZ-T7A?
ISL9104AIRUCZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104AIRUCZ-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 ISL9104AIRUCZ-T7A?
For technical support, including ISL9104AIRUCZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104AIRUCZ-T7A requirements.
6.How does Aetrix verify that ISL9104AIRUCZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9104AIRUCZ-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 ISL9104AIRUCZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9104AIRUCZ-T7A?
All ISL9104AIRUCZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104AIRUCZ-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 ISL9104AIRUCZ-T7A part is unused and in its original packaging.
Return procedure for ISL9104AIRUCZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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