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Renesas ISL9104IRUAZ-T
- Part No.:
- ISL9104IRUAZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104IRUAZ-T.pdf
- Description:
- IC REG BUCK ADJ 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,488
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Product details
Overview
ISL9104IRUAZ-T from Intersil is a 500mA, 4.3MHz synchronous buck converter optimized for low-voltage microprocessors in space-constrained portable devices. It operates from 2.7V–6.0V input, delivers adjustable output down to 0.8V via external resistor divider, and features 20µA quiescent current in skip mode, 100% duty-cycle operation, and integrated P/N-channel MOSFETs.
For engineers reviewing the ISL9104IRUAZ-T datasheet, ISL9104IRUAZ-T pinout, ISL9104IRUAZ-T application, or ISL9104IRUAZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency behavior across load conditions, and real-world selection guidance for battery-powered embedded power rails.
Technical Context
The ISL9104IRUAZ-T uses peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its feedback loop references a precise 0.8V bandgap voltage at the FB pin, enabling accurate output regulation over temperature and line variation.
Under light load, it autonomously enters skip mode (PFM) after detecting 16 consecutive zero-crossing cycles at the SW node, reducing switching frequency to minimize loss. At heavy load, it reverts to fixed 4.3MHz PWM operation with typical 93% efficiency at 500mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 500mA continuous - supports full-power operation of ARM Cortex-M cores and baseband processors. |
| Switching Frequency | 4.3MHz ±0.7MHz - enables use of 1.0µH inductor and 4.7µF ceramic capacitors, minimizing PCB area to <0.5cm². |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li⁺ cell (2.7–4.2V), three NiMH cells, or regulated 5V rail. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby/sleep states of handheld devices. |
| Feedback Reference | 0.8V ±2% over –40°C to +85°C - sets output voltage via external resistor divider (e.g., 1.5V = R1=84.5kΩ, R2=97.6kΩ). |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, sustaining regulation as input voltage approaches VOUT + IRDS(ON). |
| Shutdown Current | 0.05µA typical - ensures near-zero leakage when disabled via EN pin, critical for system-level power gating. |
Pinout & Package
ISL9104IRUAZ-T is housed in a RoHS-compliant 1.6mm × 1.6mm µTDFN-6 package with wettable flank leads for automated optical inspection. Thermal resistance θJA is 160°C/W on standard test board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–6.0V supply; requires local 4.7µF X5R ceramic decoupling capacitor to GND. |
| EN (Pin 2) | Logic enable | Active-high digital control: high ≥1.4V enables regulation and soft-start; low ≤0.4V disables IC and discharges output capacitor. |
| NC (Pin 3) | No connect | Internally unconnected; must be left floating - no external tie or pull-up/down. |
| FB (Pin 4) | Feedback sense | Connects to resistor divider output for adjustable VOUT; referenced to 0.8V internal bandgap; max bias current 100nA. |
| GND (Pin 5) | Power ground | Primary return path for input/output currents; must be tied to solid ground plane adjacent to VIN and SW traces. |
| SW (Pin 6) | Switch node | Drives external inductor; carries high di/dt switching current - requires short, wide trace routing away from noise-sensitive nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-channel MOSFETs | P-ch RDS(ON) = 0.45Ω / N-ch RDS(ON) = 0.4Ω @ 3.6V - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Digital soft-start | 1.0ms controlled ramp - prevents inrush current during power-up, protecting input source and downstream circuitry. |
| Output capacitor discharge | Internal bleeding FET (RON ≈100Ω) - actively discharges VOUT when EN is low, ensuring safe sequencing in multi-rail systems. |
| Protection suite | Peak current limiting (1.0A typ), thermal shutdown (130°C), UVLO (2.5V threshold), and short-circuit protection - enables robust operation without external supervision. |
| Ultrasonic skip mode | Not implemented - ISL9104IRUAZ-T is the non-ultrasonic variant; audible noise may occur below ~20kHz during light-load PFM operation. |
Applications
| Mobile Phone Core Rail | WCDMA Transceiver Bias |
|---|---|
Use Scenario: Powering ARM-based application processor core (e.g., Qualcomm Snapdragon S4) requiring 1.2V/500mA with tight transient response. IC Role / Device Role / Timing Role: Primary step-down regulator delivering dynamically scaled core voltage under DVFS control via FB resistor network. Use Value: 4.3MHz switching enables 1.0µH inductor and compact 0.5cm² solution; 20µA IQ preserves standby battery life exceeding 72 hours. |
Use Scenario: Supplying RF transceiver analog blocks (PA bias, LNA, mixer) in WCDMA handsets needing stable 2.5V/300mA with low noise. IC Role / Device Role / Timing Role: Low-noise, high-PSRR point-of-load regulator; FB pin filtered with 47pF capacitor per AN1522 for improved stability. Use Value: Integrated MOSFETs and 100% duty cycle support >90% efficiency at 2.5V out from 3.6V Li⁺ input; thermal shutdown prevents damage during RF burst transmission. |
| Portable Instrument ADC Reference | MP3 Player DSP Core |
Use Scenario: Generating clean 1.8V reference rail for 16-bit SAR ADC in handheld multimeter or data logger. IC Role / Device Role / Timing Role: Precision-adjustable buck supplying low-noise analog domain; FB divider set to 1.8V with 0.8V reference and 1% resistors. Use Value: ±2% FB accuracy over temperature ensures <±36mV output error; low 20µA IQ minimizes self-heating that could drift ADC reference. |
Use Scenario: Powering audio DSP core (e.g., TI TMS320C55x) in battery-operated MP3 player requiring 1.5V/450mA with rapid load-step response. IC Role / Device Role / Timing Role: High-efficiency main supply with automatic PFM→PWM transition during playback bursts. Use Value: Peak-current-mode control delivers <50mV output deviation during 5mA→300mA load steps; soft-start prevents pop noise in audio amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62231DRYR | 3MHz switching, 300mA rated, 17µA IQ, 0.6V FB reference, 2.05–6.5V input | Limited output current headroom for 500mA loads; lower FB voltage increases resistor divider sensitivity to leakage. | Select only if 300mA load ceiling is sufficient and higher input voltage range (up to 6.5V) is required. |
| Analog Devices ADP2119ACPZ-R7 | 3MHz switching, 600mA rated, 25µA IQ, 0.8V FB, 2.3–5.5V input, no integrated bleed FET | Higher current capability but lacks active output discharge - requires external circuitry for safe sequencing. | Prefer when higher output current margin is needed and system design accommodates external discharge path. |
Compared with TPS62231DRYR and ADP2119ACPZ-R7, ISL9104IRUAZ-T uniquely combines guaranteed 500mA output, integrated bleed FET, and 4.3MHz operation in a 1.6×1.6mm footprint - making it optimal for ultra-compact, battery-sensitive designs requiring full-feature integration.
Availability
ISL9104IRUAZ-T is available at Aetrix Electronics and suitable for mobile phone core rails, WCDMA transceiver bias, portable instrument ADC references, MP3 player DSP cores, and handheld medical device logic supplies requiring stable component supply across production lifecycles.
Supply support for ISL9104IRUAZ-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
Intersil Corporation is a U.S.-based designer of high-performance analog semiconductors, specializing in power management and signal processing ICs for portable, automotive, and industrial markets.
The ISL9104 product line targets space-constrained, battery-powered applications such as smartphones, PDAs, and portable instruments - delivering high efficiency, ultralow quiescent current, and minimal external component count in sub-2mm² packages.
FAQ
What output voltage does ISL9104IRUAZ-T support?
ISL9104IRUAZ-T is the adjustable-output variant with no factory-set voltage. It uses an external resistor divider on the FB pin to set output from 0.8V up to just below VIN. The internal 0.8V reference enables precise configurations like 1.2V (R1=80.6kΩ, R2=162kΩ) or 1.5V (R1=84.5kΩ, R2=97.6kΩ), as specified in Table 1 of the FN6829 datasheet.
Does ISL9104IRUAZ-T include output capacitor discharge functionality?
Yes, ISL9104IRUAZ-T integrates a dedicated bleeding MOSFET (RON ≈100Ω) that actively discharges the output capacitor when the EN pin is driven low. This feature ensures rapid VOUT collapse for safe power sequencing in multi-rail systems - a key differentiator versus alternatives lacking internal discharge paths.
What is the maximum achievable efficiency of ISL9104IRUAZ-T?
ISL9104IRUAZ-T achieves up to 93% peak efficiency at 500mA load, as measured with VIN=3.6V, VOUT=1.5V, and 1.0µH inductor (Figure 9). Efficiency remains >85% across 10mA–500mA loads for VOUT=1.5V and VIN=2.7–4.9V, per Figures 3–4 in the FN6829 datasheet.
Can ISL9104IRUAZ-T operate with a single Li-ion cell?
Yes, ISL9104IRUAZ-T supports input voltages from 2.7V to 6.0V, fully covering the discharge curve of a single Li-ion cell (2.7–4.2V). Its 100% duty-cycle capability maintains regulation down to <300mV dropout at 500mA, allowing sustained operation even as the cell voltage declines near end-of-discharge.
Is ISL9104IRUAZ-T pin-compatible with ISL9104A variants?
No - ISL9104IRUAZ-T and ISL9104AIRUAZ-T share identical pinout and package (µTDFN-6), but differ in ultrasonic skip mode implementation. ISL9104IRUAZ-T lacks ultrasonic PFM operation, so audible noise may occur under light load. Substituting requires validation of acoustic requirements and potential firmware adjustments for EN timing.
ISL9104IRUAZ-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- 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)
ISL9104IRUAZ-T FAQ
1.How can I place an order for ISL9104IRUAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104IRUAZ-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 ISL9104IRUAZ-T reliable?
The price and inventory of ISL9104IRUAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104IRUAZ-T is usually 5 days.
3.What payment methods are accepted for ISL9104IRUAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104IRUAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104IRUAZ-T?
ISL9104IRUAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104IRUAZ-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 ISL9104IRUAZ-T?
For technical support, including ISL9104IRUAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104IRUAZ-T requirements.
6.How does Aetrix verify that ISL9104IRUAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9104IRUAZ-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 ISL9104IRUAZ-T meets industry standards.
7.What is the process for return or replacement of ISL9104IRUAZ-T?
All ISL9104IRUAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104IRUAZ-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 ISL9104IRUAZ-T part is unused and in its original packaging.
Return procedure for ISL9104IRUAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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