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Renesas ISL9103AIRUFZ-T
- Part No.:
- ISL9103AIRUFZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9103AIRUFZ-T.pdf
- Description:
- IC REG BUCK 2.5V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,742
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Product details
Overview
ISL9103AIRUFZ-T from Renesas (formerly Intersil) is a 500mA, 2.4MHz synchronous buck converter optimized for low-voltage microprocessor power in space-constrained portable devices. It delivers a fixed 2.5V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and ultrasonic skip-mode switching to eliminate audible noise - ideal for WCDMA handsets and MP3 players.
For engineers reviewing the ISL9103AIRUFZ-T datasheet, ISL9103AIRUFZ-T pinout, ISL9103AIRUFZ-T application, or ISL9103AIRUFZ-T equivalent, key selection criteria include its 2.4MHz PWM frequency enabling compact 2.2µH inductors, integrated P/N-channel MOSFETs with 0.45Ω/0.4Ω typical RDS(on), fixed 2.5V output accuracy of ±3%, and ultrasonic skip-mode operation exclusive to the ISL9103A variant.
Technical Context
The ISL9103AIRUFZ-T employs peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its voltage loop uses a precision 0.8V bandgap reference and transconductance error amplifier with internal RC compensation.
Under light load, it autonomously enters ultrasonic skip mode (PFM) after detecting 16 consecutive zero-crossings at the SW node; regulation is maintained by pulsing the P-MOSFET at ~20% of peak current limit until VOUT rises 1.5% above nominal, then fully discharging the inductor to zero before resuming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±3% over temperature and line - ensures stable core logic supply without external feedback resistors. |
| Switching Frequency | 2.4MHz (1.9–2.75MHz range) - enables use of tiny 2.2µH inductors and 10µF ceramic capacitors, minimizing PCB area to <0.5cm². |
| Max Output Current | 500mA guaranteed minimum - supports single-core microprocessors and baseband ICs in cellular handsets. |
| Quiescent Current | 20µA typical in skip mode - maximizes battery runtime in standby and low-activity states of portable equipment. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li⁺ cell (2.7–4.2V), three NiMH cells (~3.6V), or regulated 5V rails. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, extending usable battery life down to low VIN conditions. |
| Shutdown Current | <1µA logic-controlled - enables deep power-down during system sleep with negligible battery drain. |
Pinout & Package
ISL9103AIRUFZ-T is housed in a RoHS-compliant 6-pin Ultra-Thin Dual Flat No-Lead (UTDFN) package measuring 1.6mm × 1.6mm × 0.5mm, with exposed thermal pad for enhanced power dissipation in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.7–6.0V supply; requires local 10µF ceramic decoupling capacitor to minimize input ripple and high-frequency noise. |
| EN (Pin 2) | Enable control | Active-high logic input; asserts soft-start when high, disables regulator and actively discharges output capacitor when low. |
| NC (Pin 3) | No-connect | Internally unconnected; must be left floating - no external tie required. |
| FB (Pin 4) | Feedback reference | Internally tied to 2.5V output for fixed-version operation; not user-accessible - eliminates external resistor divider. |
| GND (Pin 5) | Power ground | Primary return path for input/output currents; must be connected to solid ground plane adjacent to VIN and SW traces. |
| SW (Pin 6) | Switching node | Connects to inductor's high-side terminal; carries high di/dt square-wave current - requires short, wide, low-inductance routing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Exclusive to ISL9103A variants - suppresses audible coil whine by operating PFM pulses above 20kHz, critical for consumer audio devices. |
| Integrated MOSFETs | P-Channel + N-Channel synchronous switches with 0.45Ω/0.4Ω typical RDS(on) - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Output capacitor discharge | Internal bleeding MOSFET (100Ω typical RDS(on)) actively discharges VOUT when EN = LOW - prevents residual voltage from interfering with power sequencing or safety compliance. |
| Digital soft-start | 1.2ms controlled ramp-up - limits inrush current into output capacitance, preventing input rail collapse and stress on input capacitors. |
| Protection suite | Peak current limiting (0.95A typ), thermal shutdown (130°C), undervoltage lockout (2.5V rising), and short-circuit protection - ensures robust operation under fault conditions. |
Applications
| Mobile Handset Power | Portable Audio Device Supply |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver in WCDMA handsets with single Li⁺ battery input. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 2.5V at up to 500mA with ultrasonic skip mode to avoid interference with audio subsystems. Use Value: Enables simultaneous RF transmission and audio playback without audible switching noise, while extending talk time via 20µA light-load IQ. |
Use Scenario: Supplying DSP and DAC in battery-powered MP3 players requiring clean, quiet DC power. IC Role / Device Role / Timing Role: Fixed-output buck converter providing regulated 2.5V rail with <300mV dropout to sustain operation down to 2.7V battery voltage. Use Value: Eliminates need for external feedback components and avoids audible coil whine during playback pauses or low-volume operation. |
| PDAs and Palmtop Systems | Low-Power Instrumentation |
Use Scenario: Generating core logic voltage for ARM-based PDAs powered by 3×NiMH cells (3.6V nominal). IC Role / Device Role / Timing Role: High-efficiency synchronous buck regulator operating at 2.4MHz to minimize passive component size in tight board real estate. Use Value: Reduces total solution footprint to under 0.5cm² while maintaining >90% efficiency across 10mA–500mA load range. |
Use Scenario: Powering precision analog front-ends and microcontrollers in handheld test meters with limited battery capacity. IC Role / Device Role / Timing Role: Low-quiescent-current regulator supporting long idle periods between measurements with rapid wake-up capability. Use Value: Achieves multi-week battery life via sub-1µA shutdown current and 20µA skip-mode IQ, without sacrificing transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 2.5V fixed output, 2.25MHz switching, 35µA IQ in PFM, no ultrasonic skip mode, 0.55Ω/0.45Ω MOSFETs | Lacks ultrasonic operation - may generate audible noise in audio-sensitive designs | Choose when cost sensitivity outweighs acoustic requirements and 35µA IQ is acceptable |
| RT8059GJ6 | 2.5V fixed output, 2.5MHz switching, 22µA IQ, no ultrasonic skip, 0.5Ω/0.42Ω MOSFETs, no output discharge | Missing active output capacitor discharge - unsuitable for strict power sequencing or safety-critical shutdown | Prefer where board space is constrained and output discharge is not required |
Compared with TPS62231DRYR and RT8059GJ6, the ISL9103AIRUFZ-T uniquely combines ultrasonic skip mode, active output discharge, and lower RDS(on) MOSFETs - making it the optimal choice for acoustically demanding, safety-aware portable systems requiring minimal footprint and longest battery life.
Availability
ISL9103AIRUFZ-T is available at Aetrix Electronics and suitable for mobile handset power, portable audio device supply, PDA and palmtop systems, and low-power instrumentation requiring stable component supply with full lifecycle support.
Supply support for ISL9103AIRUFZ-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 management, and SoC solutions, formed through the integration of Intersil, NEC Electronics, and Renesas Technology.
The ISL9103AIRUFZ-T belongs to Renesas' high-efficiency, ultra-small footprint DC-DC converter product line, designed specifically for battery-powered portable electronics demanding low IQ, ultrasonic operation, and minimal PCB area.
FAQ
What is the output voltage tolerance of the ISL9103AIRUFZ-T over temperature and line variations?
The ISL9103AIRUFZ-T provides a fixed 2.5V output with ±3% accuracy across the full operating temperature range of –40°C to +85°C and input voltage range of 2.7V to 6.0V. This specification is guaranteed in PWM mode and applies to all production units, ensuring reliable logic-level compatibility for microprocessors and baseband ICs without requiring external trimming.
Does the ISL9103AIRUFZ-T support ultrasonic operation, and how is it implemented?
Yes, the ISL9103AIRUFZ-T - as an ISL9103A-series part - implements ultrasonic skip mode to prevent audible coil whine. When operating in light-load PFM mode, switching pulses remain above 20kHz by design, achieved through precise zero-cross detection and controlled pulse timing. This feature is intrinsic to the ISL9103A silicon and is not present in legacy ISL9103 variants.
How does the ISL9103AIRUFZ-T handle output capacitor discharge during shutdown?
When the EN pin is driven low, the ISL9103AIRUFZ-T activates an internal N-channel bleeding MOSFET (100Ω typical RDS(on)) between the FB/SW node and GND. This provides a controlled discharge path for the output capacitor, reducing VOUT to near-zero within milliseconds - satisfying IEC 62368-1 safety requirements and enabling clean power sequencing in multi-rail systems.
What is the minimum input voltage required to maintain regulation at 500mA output current?
At 500mA load, the ISL9103AIRUFZ-T maintains regulation down to approximately 2.8V input due to its 100% duty-cycle capability and low RDS(on) P-MOSFET (0.45Ω typical). With 2.5V output and <300mV dropout, the absolute minimum VIN is 2.5V + dropout voltage - allowing continued operation as the Li⁺ battery discharges below 3.0V while sustaining full rated current.
Can the ISL9103AIRUFZ-T be used with a 2.2µH inductor and 10µF ceramic output capacitor?
Yes - the ISL9103AIRUFZ-T is fully characterized and optimized for use with a 2.2µH shielded inductor (e.g., Sumida CDRH2D14NP-2R2NC) and dual 10µF X5R/X7R ceramic capacitors (input and output). This combination achieves >90% efficiency at 500mA, meets EMI targets, and fits within the specified 0.5cm² total solution area per the datasheet's typical application circuit.
ISL9103AIRUFZ-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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UTDFN (1.6x1.6)
ISL9103AIRUFZ-T FAQ
1.How can I place an order for ISL9103AIRUFZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9103AIRUFZ-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 ISL9103AIRUFZ-T reliable?
The price and inventory of ISL9103AIRUFZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9103AIRUFZ-T is usually 5 days.
3.What payment methods are accepted for ISL9103AIRUFZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9103AIRUFZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9103AIRUFZ-T?
ISL9103AIRUFZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9103AIRUFZ-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 ISL9103AIRUFZ-T?
For technical support, including ISL9103AIRUFZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9103AIRUFZ-T requirements.
6.How does Aetrix verify that ISL9103AIRUFZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9103AIRUFZ-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 ISL9103AIRUFZ-T meets industry standards.
7.What is the process for return or replacement of ISL9103AIRUFZ-T?
All ISL9103AIRUFZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9103AIRUFZ-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 ISL9103AIRUFZ-T part is unused and in its original packaging.
Return procedure for ISL9103AIRUFZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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