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Renesas ISL9104IRUJZ-T
- Part No.:
- ISL9104IRUJZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104IRUJZ-T.pdf
- Description:
- IC REG BUCK 2.8V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,903
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Product details
Overview
ISL9104IRUJZ-T from Renesas Electronics (formerly Intersil) is a 500mA, 4.3MHz synchronous buck DC-DC converter optimized for low-voltage microprocessor power in space-constrained portable devices. It delivers a fixed 2.8V output from 2.7V–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrates P- and N-channel MOSFETs in a 1.6×1.6mm µTDFN package.
For engineers reviewing the ISL9104IRUJZ-T datasheet, ISL9104IRUJZ-T pinout, ISL9104IRUJZ-T application, or ISL9104IRUJZ-T equivalent, key selection criteria include light-load efficiency optimization, ultrasmall footprint requirements, fixed-output voltage stability under Li+-cell input variation, and integrated discharge functionality for fast power-down sequencing.
Technical Context
The ISL9104IRUJZ-T employs peak-current-mode PWM control with internal slope compensation for fast transient response and cycle-by-cycle current limiting. Its 4.3MHz fixed-frequency operation enables use of 1.0µH inductors and 4.7µF ceramic capacitors, minimizing PCB area.
Under light load, it automatically enters skip mode (PFM), reducing switching frequency and achieving 20µA typical quiescent current; at heavy load, it transitions seamlessly to fixed-frequency PWM. The device includes zero-cross detection for skip-mode entry/exit, internal digital soft-start, and logic-controlled shutdown drawing <1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±3% over temperature and line - ensures stable core voltage for 2.8V I/O rails without external feedback resistors. |
| Max Output Current | 500mA guaranteed - supports moderate-power baseband processors or RF front-end ICs in handheld devices. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li+ cell (2.7–4.2V), three NiMH cells, or regulated 5V supplies. |
| Switching Frequency | 4.3MHz (3.6–4.9MHz range) - enables ultra-compact filter design with sub-2mm² total solution size. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby/sleep states of mobile phones and PDAs. |
| Duty Cycle | 100% maximum - maintains regulation down to VIN = VOUT + dropout (~2.8V + 0.25V), critical for end-of-discharge Li+ operation. |
| Shutdown Current | <1µA - minimizes system leakage during full power-off, supporting low-power wake-on-event architectures. |
Pinout & Package
The ISL9104IRUJZ-T is housed in a Pb-free, RoHS-compliant 6-pin 1.6mm × 1.6mm µTDFN package with exposed thermal pad (Package Drawing L6.1.6x1.6). Pin 3 is NC (no connect); all other pins are functional and require proper routing per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 2.7–6.0V; requires local 4.7µF ceramic decoupling capacitor to minimize high-frequency noise injection into source rail. |
| EN (Pin 2) | Logic-enable control input | Active-high enable; drives internal reference and soft-start when high; discharges output capacitor when pulled low. |
| NC (Pin 3) | No-connect terminal | Must be left floating - no internal connection; not used for thermal or electrical purposes. |
| FB (Pin 4) | Feedback node | Internally tied to 2.8V reference for fixed-output version; not externally accessible - simplifies layout and eliminates resistor-divider errors. |
| GND (Pin 5) | Power ground reference | Primary return path for input/output currents; must be connected to solid ground plane adjacent to thermal pad for thermal and EMI performance. |
| SW (Pin 6) | Switching node | Connects to inductor high-side terminal; carries high di/dt square-wave current - requires short, wide trace and isolation from sensitive analog nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-MOSFETs | 0.45Ω/0.40Ω typical RDS(on) at 3.6V - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Internal Digital Soft-Start | 1.0ms typical ramp time - prevents inrush current and output overshoot during power-up, protecting downstream loads. |
| Output Capacitor Discharge | Active bleed path via internal N-MOSFET - discharges output to <100mV within ~1ms after EN deactivation, enabling safe hot-swap or sequencing. |
| Overcurrent & Thermal Protection | 1.0A peak current limit and 130°C thermal shutdown with 30°C hysteresis - provides robust fault recovery without external circuitry. |
| Ultralow Dropout Operation | <300mV dropout at 500mA - sustains regulation through deep battery discharge, extending usable runtime in Li+-powered systems. |
Applications
| Mobile Phone Baseband Power | WCDMA Handset RF Bias |
|---|---|
Use Scenario: Powering ARM-based application processors and modem subsystems in slim smartphones operating from single-cell Li+ batteries. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 2.8V to processor I/O domains and memory interfaces. Use Value: 20µA skip-mode IQ and 4.3MHz switching enable compact 0.5cm² solution size while maximizing standby battery life. | Use Scenario: Supplying bias voltage to power amplifiers and transceiver ICs in 3G WCDMA handsets with dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter responding to rapid RF transmit/receive current transients. Use Value: Peak-current-mode control and 1.0A current limit ensure stable regulation during 500mA burst loads without output droop. |
| PDA Application Processor Core | Portable Instrument Sensor Interface |
Use Scenario: Generating clean 2.8V rail for low-power Cortex-M microcontrollers and touch controllers in palm-sized PDAs. IC Role / Device Role / Timing Role: Fixed-output buck regulator with integrated soft-start and discharge for controlled power sequencing. Use Value: 100% duty-cycle capability maintains regulation down to 3.05V input, supporting full battery discharge range without brownout. | Use Scenario: Powering precision analog front-ends and ADCs in handheld test equipment requiring low-noise, stable supply. IC Role / Device Role / Timing Role: Low-ripple DC-DC source with minimal EMI due to high-frequency operation and tight layout control. Use Value: 4.3MHz switching moves switching harmonics beyond sensitive audio/low-frequency bands, easing EMI filtering. |
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 | Fixed 2.8V output, 400mA rating, 3.6MHz switching, 22µA IQ - lower current capability and slightly lower frequency. | Targeted at lower-power MCU cores; insufficient for 500mA peak loads in RF sections. | Select when board space is identical but load current remains ≤400mA and thermal margin is adequate. |
| Analog Devices ADP2119ACPZ-R7 | Adjustable 0.8–3.3V output, 600mA rating, 3MHz switching, 30µA IQ - requires external feedback resistors and lacks integrated discharge. | Suitable for multi-rail systems needing programmable outputs; adds design overhead for fixed 2.8V use. | Choose when flexibility across multiple output voltages justifies added components and layout effort. |
Compared with TPS62231DRYR and ADP2119ACPZ-R7, the ISL9104IRUJZ-T delivers higher guaranteed current (500mA vs. 400/600mA), superior light-load efficiency (20µA vs. 22/30µA), and built-in output discharge - making it optimal for space-constrained, battery-sensitive 2.8V applications where reliability and simplicity are prioritized.
Availability
ISL9104IRUJZ-T is available at Aetrix Electronics and suitable for mobile phone baseband power, WCDMA handset RF bias, PDA application processor core, and portable instrument sensor interface applications requiring stable component supply and long-term production continuity.
Supply support for ISL9104IRUJZ-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 is a global leader in microcontrollers, analog, power, and SoC products, formed through the integration of NEC Electronics and Renesas Technology.
The ISL9104IRUJZ-T belongs to Renesas' high-efficiency, ultra-small buck converter product line, designed specifically for battery-powered portable electronics demanding minimal footprint, low IQ, and robust power sequencing.
FAQ
What is the output voltage of the ISL9104IRUJZ-T and is it adjustable?
The ISL9104IRUJZ-T provides a factory-trimmed fixed output voltage of 2.8V ±3% over temperature and line conditions. It is not adjustable - the FB pin is internally connected to the 2.8V reference, eliminating external feedback resistors and associated accuracy errors. This simplifies design and improves reliability in high-volume portable applications.
Does the ISL9104IRUJZ-T support 100% duty-cycle operation and what is its practical benefit?
Yes, the ISL9104IRUJZ-T supports 100% duty-cycle operation, enabling dropout voltage as low as ~250mV at 500mA (based on P-MOSFET RDS(on)). This allows continued regulation when input voltage falls near the output level - for example, sustaining 2.8V output down to ~3.05V input - which maximizes usable capacity from a single Li+ cell and prevents premature system shutdown.
How does the ISL9104IRUJZ-T manage efficiency at light load?
The ISL9104IRUJZ-T automatically enters skip mode (PFM) under light load, reducing switching frequency and achieving a typical quiescent current of 20µA. This mode minimizes switching losses while maintaining regulation, significantly extending battery life in standby or idle states common in mobile phones and PDAs - a key advantage over fixed-frequency-only converters.
What protection features are integrated into the ISL9104IRUJZ-T?
The ISL9104IRUJZ-T integrates overcurrent protection (1.0A peak limit), thermal shutdown (130°C trip with 30°C hysteresis), undervoltage lockout (2.5V rising threshold), and short-circuit protection via FB monitoring. It also includes internal digital soft-start and logic-controlled shutdown with <1µA current - eliminating need for external protection circuitry in most portable designs.
Can the ISL9104IRUJZ-T safely discharge its output capacitor when disabled?
Yes, the ISL9104IRUJZ-T includes an internal bleeding MOSFET that actively discharges the output capacitor when the EN pin is driven low. This feature ensures rapid, controlled discharge to <100mV within approximately 1ms, enabling safe power sequencing, hot-swap compatibility, and elimination of residual voltage hazards in multi-rail systems.
ISL9104IRUJZ-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)
ISL9104IRUJZ-T FAQ
1.How can I place an order for ISL9104IRUJZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104IRUJZ-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 ISL9104IRUJZ-T reliable?
The price and inventory of ISL9104IRUJZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104IRUJZ-T is usually 5 days.
3.What payment methods are accepted for ISL9104IRUJZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104IRUJZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104IRUJZ-T?
ISL9104IRUJZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104IRUJZ-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 ISL9104IRUJZ-T?
For technical support, including ISL9104IRUJZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104IRUJZ-T requirements.
6.How does Aetrix verify that ISL9104IRUJZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9104IRUJZ-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 ISL9104IRUJZ-T meets industry standards.
7.What is the process for return or replacement of ISL9104IRUJZ-T?
All ISL9104IRUJZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104IRUJZ-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 ISL9104IRUJZ-T part is unused and in its original packaging.
Return procedure for ISL9104IRUJZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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