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Renesas ISL9104AIRUJZ-T
- Part No.:
- ISL9104AIRUJZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104AIRUJZ-T.pdf
- Description:
- IC REG BUCK 2.8V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,194
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Product details
Overview
ISL9104AIRUJZ-T 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 a fixed 2.8V output from 2.7V–6.0V input, features ultrasonic skip-mode operation (≤20µA IQ), 100% duty-cycle low-dropout capability, and integrated P/N-channel MOSFETs with <0.6Ω ON-resistance. It powers baseband processors in WCDMA handsets requiring stable, high-efficiency sub-3V rail generation.
For engineers reviewing the ISL9104AIRUJZ-T datasheet, ISL9104AIRUJZ-T pinout, ISL9104AIRUJZ-T application, or ISL9104AIRUJZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency behavior across load conditions, and real-world alternative selection guidance for portable power design.
Technical Context
The ISL9104AIRUJZ-T employs peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its oscillator operates at 4.3MHz (3.6–4.9MHz over temperature), enabling use of a 1.0µH inductor and 4.7µF ceramic capacitors to minimize PCB area.
Under light load, it autonomously enters ultrasonic skip mode (PFM) - triggered after 16 consecutive zero-crossing cycles - reducing switching frequency while maintaining >20kHz operation to avoid audible noise. During shutdown, an internal bleeding FET discharges the output capacitor via a 100Ω path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±3% over line, load, and temperature - enables direct replacement of LDOs without external feedback resistors. |
| Input Voltage Range | 2.7V to 6.0V - supports single Li⁺ cell (2.7–4.2V), three NiMH cells, or regulated 5V rails without input stage redesign. |
| Switching Frequency | 4.3MHz typical (3.6–4.9MHz range) - allows ≤1.0µH inductors and <10mm² total solution size including passives. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby states of mobile phones and MP3 players. |
| Max Output Current | 500mA guaranteed - sufficient for ARM Cortex-A/M cores and RF transceivers in WCDMA handsets. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, sustaining regulation down to VIN = VOUT + 0.3V. |
| Shutdown Current | 0.05µA typical - ensures near-zero leakage during system sleep modes. |
Pinout & Package
ISL9104AIRUJZ-T is housed in a RoHS-compliant 6-pin 1.6mm × 1.6mm µTDFN package with wettable flanks, rated for -40°C to +85°C ambient operation and 160°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Primary input supply connection | Accepts 2.7–6.0V; requires local 4.7µF X5R ceramic decoupling to GND for EMI suppression and transient current sourcing. |
| EN (Pin 2) | Logic-controlled enable input | Active-high (1.4V min); pulls internal discharge FET when low to rapidly collapse VOUT - supports precise power sequencing in multi-rail systems. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating per datasheet - no tie to GND or VIN. |
| FB (Pin 4) | Feedback reference node | Internally tied to 2.8V output for fixed version; not accessible externally - eliminates resistor divider layout errors and drift. |
| GND (Pin 5) | Power ground reference | Shared analog/digital ground; requires low-impedance connection to input/output capacitor grounds to minimize noise coupling into FB loop. |
| SW (Pin 6) | Switching node | Connects to inductor high-side; carries high di/dt square wave - must be routed short/wide with minimal loop area to reduce EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Operates >20kHz in PFM to eliminate audible coil whine in handheld audio devices - exclusive to ISL9104A variants like ISL9104AIRUJZ-T. |
| Integrated MOSFETs | P-Channel (0.45Ω typ) and N-Channel (0.4Ω typ) switches eliminate external FETs and gate drivers - reduces BOM count and layout complexity. |
| Output capacitor discharge | Internal 100Ω bleeding FET activates on EN low - discharges VOUT within ~10ms, preventing latch-up in hot-swap or reset scenarios. |
| Digital soft-start | 1.0ms controlled ramp limits inrush current - prevents input voltage droop and avoids false UVLO triggering during power-up. |
| Thermal shutdown | 130°C trip with 30°C hysteresis - protects against sustained overload or poor heatsinking without requiring external thermal monitoring. |
Applications
| WCDMA Handset Baseband Power | Portable Medical Instrument Core Supply |
|---|---|
Use Scenario: Powers ARM9/ARM11 application processors and cellular modem ICs in space-constrained 3G handsets operating from single Li⁺ cells. IC Role / Device Role / Timing Role: Primary step-down regulator generating clean 2.8V core rail; handles dynamic load steps up to 500mA with <30mV undershoot. Use Value: Ultrasonic skip mode prevents audible noise during voice calls; 100% duty cycle maintains regulation as battery discharges below 3.0V. |
Use Scenario: Supplies low-noise 2.8V rail to ADCs, microcontrollers, and sensor interfaces in handheld glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter replacing linear regulators to extend battery life beyond 100 hours per charge. Use Value: 20µA quiescent current in skip mode minimizes standby drain; 4.3MHz switching avoids interference with sensitive analog front-ends. |
| MP3 Player DSP Core Rail | Ultra-Compact PDA Application Processor |
Use Scenario: Delivers stable 2.8V to audio DSPs and flash memory controllers in flash-based portable music players. IC Role / Device Role / Timing Role: Synchronous buck converter managing rapid load transients during audio decode bursts and display backlight activation. Use Value: Peak-current-mode control ensures <10µs response to 100mA load steps; small 1.6×1.6mm footprint fits tight PCB real estate. |
Use Scenario: Generates processor core voltage for ARM-based PDAs using single-cell Li⁺ batteries with aggressive power management. IC Role / Device Role / Timing Role: Main system regulator supporting dynamic voltage scaling (DVS) via EN-controlled on/off cycling between tasks. Use Value: 0.05µA shutdown current preserves battery during long idle periods; internal soft-start prevents brownout during wake-from-sleep. |
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, 1.8–6.5V input, no ultrasonic skip mode | Lacks ultrasonic PFM - may generate audible noise in audio-sensitive devices | Choose for cost-sensitive designs where 300mA suffices and acoustic performance is non-critical. |
| MAX8640YETA+ | 2.25MHz frequency, 600mA output, 2.6–5.5V input, 25µA IQ in PFM, no output discharge | Higher output current but no integrated bleed FET - requires external circuitry for safe VOUT collapse | Prefer when higher load headroom is needed and board space allows discrete discharge solution. |
Compared with TPS62231DRYR and MAX8640YETA+, ISL9104AIRUJZ-T uniquely combines ultrasonic skip mode, integrated output discharge, and 500mA capability in a 1.6×1.6mm package - making it optimal for noise-sensitive, space-constrained, single-cell portable systems requiring robust power sequencing.
Availability
ISL9104AIRUJZ-T is available at Aetrix Electronics and suitable for WCDMA handset power, portable medical instrument core supply, MP3 player DSP rails, ultra-compact PDA application processors, and other applications requiring stable component supply with high-volume traceability and lifecycle continuity.
Supply support for ISL9104AIRUJZ-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 semiconductors for mobile, computing, and industrial markets, with ISO9001-certified manufacturing and global distribution.
The ISL9104A family was engineered specifically for ultra-compact, battery-powered consumer electronics requiring high efficiency at light loads, ultrasonic noise suppression, and minimal external component count - targeting next-generation handsets and portable instruments.
FAQ
What is the output voltage of the ISL9104AIRUJZ-T?
The ISL9104AIRUJZ-T provides a factory-trimmed fixed output voltage of 2.8V with ±3% accuracy over line, load, and temperature. This eliminates the need for external feedback resistors and ensures consistent regulation without calibration - critical for reliable operation in WCDMA handset baseband power applications where voltage tolerance directly impacts processor stability.
Does the ISL9104AIRUJZ-T support ultrasonic operation to prevent audible noise?
Yes, the ISL9104AIRUJZ-T - as an ISL9104A variant - includes ultrasonic skip mode that maintains switching frequencies above 20kHz even under light loads. This feature prevents audible coil whine in handheld devices such as mobile phones and MP3 players, distinguishing it from the base ISL9104 series which lacks this capability.
How does the ISL9104AIRUJZ-T handle output capacitor discharge during shutdown?
The ISL9104AIRUJZ-T integrates a dedicated 100Ω bleeding MOSFET that activates automatically when the EN pin is driven low. This discharges the output capacitor within approximately 10ms, ensuring safe, rapid VOUT collapse - essential for hot-swap compatibility, reset integrity, and avoiding latch-up in multi-rail portable systems.
What is the minimum input voltage required for regulation at full 500mA load?
At 500mA output, the ISL9104AIRUJZ-T maintains regulation down to VIN = VOUT + dropout voltage. With a typical P-channel MOSFET ON-resistance of 0.45Ω and 2.8V output, the dropout is ~225mV - meaning regulation is sustained as low as ~3.025V input. This enables continued operation deep into Li⁺ battery discharge curves without brownout.
Can the ISL9104AIRUJZ-T operate with a 1.0µH inductor and 4.7µF ceramic capacitors?
Yes, the ISL9104AIRUJZ-T 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 at both input and output. This combination achieves >90% peak efficiency at 3.6V input/2.8V output and meets all transient response and EMI requirements specified in the datasheet.
ISL9104AIRUJZ-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):
- 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-T FAQ
1.How can I place an order for ISL9104AIRUJZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104AIRUJZ-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 ISL9104AIRUJZ-T reliable?
The price and inventory of ISL9104AIRUJZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104AIRUJZ-T is usually 5 days.
3.What payment methods are accepted for ISL9104AIRUJZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104AIRUJZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104AIRUJZ-T?
ISL9104AIRUJZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104AIRUJZ-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 ISL9104AIRUJZ-T?
For technical support, including ISL9104AIRUJZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104AIRUJZ-T requirements.
6.How does Aetrix verify that ISL9104AIRUJZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9104AIRUJZ-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 ISL9104AIRUJZ-T meets industry standards.
7.What is the process for return or replacement of ISL9104AIRUJZ-T?
All ISL9104AIRUJZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104AIRUJZ-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 ISL9104AIRUJZ-T part is unused and in its original packaging.
Return procedure for ISL9104AIRUJZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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