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Renesas ISL9103AIRUWZ-T
- Part No.:
- ISL9103AIRUWZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9103AIRUWZ-T.pdf
- Description:
- IC REG BUCK 1.2V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,268
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Product details
Overview
ISL9103AIRUWZ-T from Intersil is a 500mA, 2.4MHz synchronous buck converter optimized for single Li+-cell-powered portable devices. It delivers fixed 1.2V output with ±3% accuracy over temperature and line, operates from 2.7V–6.0V input, achieves up to 95% efficiency, and features 20µA quiescent current in skip mode-enabling extended battery life in mobile phones and WCDMA handsets.
For engineers reviewing the ISL9103AIRUWZ-T datasheet, ISL9103AIRUWZ-T pinout, ISL9103AIRUWZ-T application, or ISL9103AIRUWZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed 1.6×1.6mm UTDFN package mapping, real-world load transient behavior, and two rigorously cross-checked alternative parts for fixed 1.2V DC-DC conversion.
Technical Context
The ISL9103AIRUWZ-T uses peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its integrated P-Channel (0.45Ω typ at 3.6V) and N-Channel (0.4Ω typ at 3.6V) MOSFETs enable high-efficiency regulation down to 0.8V output, with 100% duty-cycle operation supporting <300mV dropout at 500mA.
Under light load, it automatically enters ultrasonic skip mode (PFM) - enabled only in ISL9103A variants - suppressing audible noise while maintaining 20µA IQ. The IC includes digital soft-start, logic-controlled shutdown (<1µA), output capacitor discharge on disable, and thermal shutdown at 130°C with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±3% over -40°C to +85°C - ensures stable core voltage for low-power microprocessors 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 rail without external pre-regulation. |
| Switching Frequency | 2.4MHz (1.9–2.75MHz range) - enables use of compact 2.2µH inductors and 10µF ceramic capacitors, reducing solution size to <0.5cm². |
| Max Output Current | 500mA guaranteed minimum - sufficient for powering ARM Cortex-M cores, baseband processors, and RF front-end bias rails. |
| Quiescent Current | 20µA typical in skip mode - maximizes standby time in always-on mobile subsystems such as touch controllers or sensor hubs. |
| Duty Cycle | 100% maximum - allows operation with <300mV dropout at full load, extending usable battery range down to ~1.5V input. |
| Shutdown Current | <1µA - meets stringent system-level power gating requirements for zero-power sleep states in handheld devices. |
Pinout & Package
ISL9103AIRUWZ-T is housed in a RoHS-compliant 6-lead Ultra-Thin Dual Flat No-Lead (UTDFN) package measuring 1.6mm × 1.6mm × 0.5mm, with exposed thermal pad for enhanced power dissipation in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 2.7–6.0V; requires local 10µF ceramic decoupling to minimize switching noise injection into source rail. |
| EN (Pin 2) | Logic-enable control input | Active-high (1.4V min); pulls FB low during disable to discharge output capacitor - critical for safe power sequencing. |
| NC (Pin 3) | No-connect terminal | Must remain unconnected and floating; no internal bond wire or circuit connection. |
| FB (Pin 4) | Feedback reference node | Internally tied to 1.2V output; not user-accessible in fixed-voltage variants - eliminates external resistor divider errors. |
| GND (Pin 5) | Power and signal ground | Primary return path for input/output currents; must be connected to solid ground plane adjacent to VIN and SW pins. |
| 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. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Enabled only in ISL9103A family - suppresses audible coil whine below 20kHz while maintaining 20µA IQ for battery longevity. |
| Integrated MOSFETs | P-Channel (0.45Ω) + N-Channel (0.4Ω) switches eliminate external FETs and gate drivers - reduces BOM count and layout complexity. |
| Output capacitor discharge | Internal bleeding MOSFET (100Ω RDS(on)) actively discharges VOUT when EN = LOW - prevents residual voltage from interfering with downstream power sequencing. |
| Digital soft-start | 1.2ms controlled ramp - limits inrush current into output capacitance, preventing input rail collapse during power-up in multi-rail systems. |
| Protection suite | Includes peak current limiting (0.95A typ), thermal shutdown (130°C), undervoltage lockout (2.5V), and short-circuit protection - enables robust field operation without external supervision. |
Applications
| Mobile Phone Core Power | WCDMA Transceiver Bias |
|---|---|
|
Use Scenario: Powers ARM-based application processor cores requiring tightly regulated 1.2V at up to 500mA in slim smartphone designs. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, low-noise DC supply with fast load transient response (<100µs recovery). Use Value: 95% peak efficiency and 20µA skip-mode IQ extend talk time by >12% versus legacy 1.5MHz converters under mixed-load conditions. |
Use Scenario: Supplies bias voltage to WCDMA power amplifier modules in 3G handsets operating from single Li+ cells. IC Role / Device Role / Timing Role: High PSRR, low-ripple DC source enabling linear PA operation without AM-to-PM distortion. Use Value: 100% duty cycle capability maintains regulation down to 1.5V input - extends usable battery range by ~180mV compared to non-100% solutions. |
| Portable Instrument MCU Rail | MP3 Player DSP Supply |
|
Use Scenario: Generates 1.2V for low-power microcontrollers in handheld test equipment with strict battery-life targets. IC Role / Device Role / Timing Role: Always-on power stage supporting deep-sleep modes with sub-µA system leakage. Use Value: <1µA shutdown current and automatic skip-to-PWM transition ensure zero wasted energy during idle periods. |
Use Scenario: Provides regulated 1.2V to audio DSPs in flash-based MP3 players where EMI-sensitive analog stages coexist on same PCB. IC Role / Device Role / Timing Role: Ultrasonic 2.4MHz switching avoids interference with 20Hz–20kHz audio band - eliminates audible artifacts. Use Value: Fixed 1.2V output eliminates resistor-divider drift, ensuring consistent DSP clock stability across temperature and aging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.2V fixed, 600mA, 3.6MHz, 22µA IQ - higher frequency enables smaller inductors but increases EMI risk near RF bands. | Lacks ultrasonic skip mode; may generate audible noise in quiet environments; no integrated output discharge. | Prefer when board space is constrained and EMI filtering is already implemented; avoid in audio-sensitive or silent-operation products. |
| RT8059NGSP | 1.2V fixed, 500mA, 2.5MHz, 25µA IQ - slightly higher quiescent current; includes programmable soft-start but no output bleed function. | Thermal shutdown threshold is 150°C (vs. 130°C), offering wider margin but slower fault response under sustained overload. | Choose when thermal robustness in high-ambient environments is prioritized over precise power sequencing control. |
Compared with TPS62231DRYR and RT8059NGSP, the ISL9103AIRUWZ-T uniquely combines ultrasonic skip mode, integrated output discharge, and 100% duty cycle in a 1.6×1.6mm footprint - making it optimal for battery-powered audio and communication devices demanding silent operation and safe power-down behavior.
Availability
ISL9103AIRUWZ-T is available at Aetrix Electronics and suitable for mobile phone core power, WCDMA transceiver bias, portable instrument MCU rails, MP3 player DSP supplies, and handheld medical device logic rails requiring stable component supply across long production lifecycles.
Supply support for ISL9103AIRUWZ-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 leading provider of precision analog and power management ICs, now part of Renesas Electronics, with expertise in high-efficiency DC-DC conversion for portable and battery-operated systems.
The ISL9103A family was designed specifically for ultra-compact, high-efficiency power delivery in Li+-powered consumer electronics - emphasizing low IQ, ultrasonic operation, and minimal external component count.
FAQ
What is the output voltage tolerance of the ISL9103AIRUWZ-T over temperature and line?
The ISL9103AIRUWZ-T delivers a fixed 1.2V output with ±3% 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 production testing and ensures reliable core voltage regulation for microprocessors without requiring external trimming or calibration. The ISL9103AIRUWZ-T achieves this via factory-trimmed internal feedback, eliminating resistor-divider drift and temperature coefficient errors inherent in adjustable versions.
Does the ISL9103AIRUWZ-T support 100% duty cycle operation, and what is its practical benefit?
Yes, the ISL9103AIRUWZ-T supports true 100% duty cycle operation, enabling dropout voltages below 300mV at 500mA load. This allows the IC to maintain regulation even as the input voltage drops close to the output level - for example, sustaining 1.2V output down to ~1.5V input from a depleted Li+ cell. This feature directly extends usable battery capacity and runtime in portable devices where every millivolt of input headroom matters.
How does the ultrasonic skip mode in the ISL9103AIRUWZ-T differ from standard PFM operation?
The ISL9103AIRUWZ-T's ultrasonic skip mode operates above 20kHz - unlike conventional PFM that can dip into audible frequencies - eliminating coil whine in quiet environments like headphones or medical instruments. This is exclusive to the ISL9103A variant (not original ISL9103) and is confirmed in the FN6828 datasheet's "Ultrasonic Function" column for ISL9103AIRUWZ-T. It maintains 20µA quiescent current while ensuring silent operation during light-load conditions.
What protection features are integrated into the ISL9103AIRUWZ-T?
The ISL9103AIRUWZ-T integrates peak current limiting (0.95A typical), thermal shutdown (130°C with 30°C hysteresis), undervoltage lockout (2.5V rising threshold), and short-circuit protection via FB monitoring. Unlike many competitors, it also includes a dedicated internal bleeding MOSFET that actively discharges the output capacitor when disabled - preventing back-powering of upstream circuits and enabling safe, controlled power-down sequences in complex multi-rail systems.
Can the ISL9103AIRUWZ-T be used with an adjustable output configuration?
No - the ISL9103AIRUWZ-T is a fixed 1.2V output variant. Its FB pin is internally connected to the output and not accessible for external resistor-divider programming. For adjustable operation, engineers must select the ISL9103AIRUAZ-T (ADJ version), which exposes the FB pin and requires external R1/R2 resistors per Equation 2 in the datasheet. Using the ISL9103AIRUWZ-T in adjustable configurations is not supported and will result in incorrect regulation.
ISL9103AIRUWZ-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):
- 1.2V
- 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)
ISL9103AIRUWZ-T FAQ
1.How can I place an order for ISL9103AIRUWZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9103AIRUWZ-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 ISL9103AIRUWZ-T reliable?
The price and inventory of ISL9103AIRUWZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9103AIRUWZ-T is usually 5 days.
3.What payment methods are accepted for ISL9103AIRUWZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9103AIRUWZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9103AIRUWZ-T?
ISL9103AIRUWZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9103AIRUWZ-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 ISL9103AIRUWZ-T?
For technical support, including ISL9103AIRUWZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9103AIRUWZ-T requirements.
6.How does Aetrix verify that ISL9103AIRUWZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9103AIRUWZ-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 ISL9103AIRUWZ-T meets industry standards.
7.What is the process for return or replacement of ISL9103AIRUWZ-T?
All ISL9103AIRUWZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9103AIRUWZ-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 ISL9103AIRUWZ-T part is unused and in its original packaging.
Return procedure for ISL9103AIRUWZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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