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Renesas ISL9103AIRUAZ-T
- Part No.:
- ISL9103AIRUAZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9103AIRUAZ-T.pdf
- Description:
- IC REG BUCK ADJ 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL9103AIRUAZ-T from Intersil is a 500mA, 2.4MHz synchronous buck converter optimized for adjustable-output power regulation in space-constrained battery-powered devices. It operates from 2.7V to 6.0V input, delivers up to 500mA with ±2% FB voltage accuracy, supports 100% duty-cycle low-dropout operation, and features ultrasonic skip mode (≤20µA IQ) for extended Li-ion battery life in mobile phones and portable instruments.
For engineers reviewing the ISL9103AIRUAZ-T datasheet, ISL9103AIRUAZ-T pinout, ISL9103AIRUAZ-T application, or ISL9103AIRUAZ-T equivalent, key selection criteria include its 1.6×1.6mm UTDFN package, adjustable 0.8V–3.3V output via external resistor divider, integrated P/N-MOSFETs with 0.45Ω/0.4Ω typical RDS(on), thermal shutdown at 130°C, and ultrasonic PFM mode to eliminate audible noise in handheld devices.
Technical Context
The ISL9103AIRUAZ-T implements peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its functional block includes a transconductance error amplifier, zero-cross sensing circuit for skip-mode entry after 16 consecutive zero-current cycles, and dedicated bleeding FET for rapid output capacitor discharge during disable.
It integrates dual MOSFETs (P-Channel high-side, N-Channel low-side), uses an internal 0.8V bandgap reference for feedback, and employs digital soft-start with 1.2ms ramp time. The device automatically transitions between fixed-frequency 2.4MHz PWM under heavy load and ultrasonic skip mode under light load-ensuring >95% efficiency at 500mA and >85% at 1mA while suppressing audible switching noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500mA guaranteed minimum - supports full-load operation in compact PDAs and WCDMA handsets without derating. |
| Switching Frequency | 2.4MHz nominal (1.9–2.75MHz range) - enables use of 2.2µH inductor and 10µF ceramic capacitors, minimizing PCB area to <0.5cm². |
| Quiescent Current | 32µA typical in skip mode - maximizes battery runtime in standby states of mobile phones and MP3 players. |
| FB Voltage Accuracy | ±2% over –40°C to +85°C - ensures stable 0.8V reference for precise output setting across temperature in portable instruments. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, extending usable battery range down to ~0.8V above output. |
| Shutdown Current | <1µA logic-controlled - prevents battery drain during system sleep or power sequencing in embedded designs. |
| Thermal Shutdown | 130°C threshold with 30°C hysteresis - provides autonomous recovery from overload without external supervision. |
Pinout & Package
ISL9103AIRUAZ-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 heat dissipation in high-density 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 high-frequency switching noise injection into source rail. |
| EN (Pin 2) | Logic enable input | Active-high control: enables regulation and initiates soft-start when ≥1.4V; forces shutdown and active output discharge when ≤0.4V. |
| NC (Pin 3) | No-connect terminal | Internally unconnected - must be left floating; no external tie or pull required. |
| FB (Pin 4) | Feedback node for output regulation | Connects to resistor divider for adjustable output; senses 0.8V reference internally - sets VOUT = 0.8V × (1 + R1/R2). |
| GND (Pin 5) | Power ground reference | Primary return path for VIN, SW, and FB circuits; must be tied directly to solid ground plane beneath IC for EMI and stability. |
| SW (Pin 6) | Switching node | Drives external inductor; carries high di/dt pulses - requires short, wide trace routing away from sensitive analog nodes like FB. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrasonic skip mode | Eliminates audible coil whine in handheld devices by operating PFM below human hearing range - exclusive to ISL9103A variants like ISL9103AIRUAZ-T. |
| Integrated MOSFETs | P-Channel (0.45Ω typ) and N-Channel (0.4Ω typ) switches reduce BOM count and improve efficiency vs discrete solutions. |
| Output capacitor bleed function | Internal N-MOSFET discharges output capacitor rapidly upon EN deactivation - prevents residual voltage from interfering with downstream power sequencing. |
| Digital soft-start | 1.2ms controlled ramp limits inrush current during startup - protects input source and avoids brownout in multi-rail battery systems. |
| Overcurrent & short-circuit protection | Peak current limit (0.95A typ) and SCP comparator monitoring FB voltage prevent damage during fault conditions without external components. |
Applications
| Mobile Phone Power Management | Portable Instrument Core Supply |
|---|---|
|
Use Scenario: Regulating core voltage for ARM-based application processors in slim smartphones powered by single Li-ion cells. IC Role / Device Role / Timing Role: Primary step-down regulator delivering adjustable 1.0–1.5V at up to 500mA with dynamic load response to CPU DVFS transitions. Use Value: Ultrasonic skip mode eliminates audible noise during idle; 100% duty cycle extends usable battery range to <2.5V input. |
Use Scenario: Providing stable 2.5V rail for precision ADCs and microcontrollers in handheld test equipment. IC Role / Device Role / Timing Role: Low-noise, high-accuracy DC-DC converter with ±2% FB tolerance and minimal output ripple for analog signal integrity. Use Value: Integrated soft-start prevents measurement offset during power-up; thermal shutdown ensures reliability during extended field use. |
| WCDMA Handset RF Subsystem | MP3 Player Audio Codec Supply |
|
Use Scenario: Generating clean 1.8V supply for RF transceivers and PA drivers in 3G handsets with tight EMI constraints. IC Role / Device Role / Timing Role: High-frequency (2.4MHz) buck converter minimizing inductor size while maintaining low EMI through controlled edge rates and layout-optimized SW node. Use Value: Small 1.6×1.6mm UTDFN footprint saves board space; ultrasonic PFM avoids interference with RF receive bands. |
Use Scenario: Powering stereo audio DAC/amp ICs in battery-operated MP3 players requiring quiet, efficient voltage conversion. IC Role / Device Role / Timing Role: Adjustable-output buck regulator delivering 0.8–3.3V with low quiescent current to maximize playback time. Use Value: 32µA skip-mode IQ extends battery life; internal bleeding FET ensures fast mute/unmute transitions without residual charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 2.25MHz switching frequency, 300mA output, 17µA IQ in PFM mode; 0.6V FB reference; no ultrasonic PFM. | Lower current rating and no ultrasonic mode - suitable for lower-power wearables but not direct replacement for 500mA loads. | Select TPS62231DRVR only if system load stays ≤300mA and audible noise is not a concern. |
| RT8059GJ6 | 1.5MHz switching frequency, 600mA output, 22µA IQ; 0.6V FB reference; no integrated bleeding FET or ultrasonic PFM. | Higher current capability but slower switching - requires larger inductor/capacitor; lacks active output discharge for strict sequencing. | Choose RT8059GJ6 when higher output current is needed and ultrasonic noise suppression is unnecessary. |
Compared with TPS62231DRVR and RT8059GJ6, ISL9103AIRUAZ-T uniquely combines 500mA capability, ultrasonic skip mode, and integrated output bleeding in a 1.6×1.6mm package - making it optimal for noise-sensitive, space-constrained Li-ion applications where full-load performance and rapid shutdown behavior are critical.
Availability
ISL9103AIRUAZ-T is available at Aetrix Electronics and suitable for mobile phone power management, portable instrument core supply, WCDMA handset RF subsystems, and MP3 player audio codec supply requiring stable component supply across production lifecycles.
Supply support for ISL9103AIRUAZ-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 power management and precision analog ICs, serving industrial, infrastructure, mobile computing, and high-end consumer markets with high-efficiency, small-footprint solutions.
The ISL9103AIRUAZ-T belongs to Intersil's high-frequency synchronous buck converter product line, designed specifically for ultra-compact, battery-powered portable electronics demanding low IQ, ultrasonic operation, and robust protection features.
FAQ
What output voltage range does the ISL9103AIRUAZ-T support?
The ISL9103AIRUAZ-T is an adjustable-output buck converter supporting 0.8V to 3.3V output via external resistor divider on the FB pin. Its internal 0.8V reference and ±2% accuracy over temperature ensure precise regulation. Fixed-output variants exist, but ISL9103AIRUAZ-T itself requires R1/R2 configuration per Equation 2 in the datasheet - enabling flexible system-level voltage scaling without changing the ISL9103AIRUAZ-T part number.
Does the ISL9103AIRUAZ-T support ultrasonic operation to avoid audible noise?
Yes, the ISL9103AIRUAZ-T explicitly includes ultrasonic skip mode - a feature confirmed in the Ordering Information table (ULTRASONIC FUNCTION = YES) and highlighted in the Features list. Unlike the base ISL9103, the "A" suffix denotes this enhancement, which suppresses switching frequencies below 20kHz during light-load PFM operation, eliminating coil whine in handheld devices such as mobile phones and portable instruments.
How does the ISL9103AIRUAZ-T handle output capacitor discharge during shutdown?
The ISL9103AIRUAZ-T integrates a dedicated N-channel bleeding MOSFET that actively discharges the output capacitor when the EN pin is pulled low. As documented in Pin Descriptions and Features, this function ensures rapid voltage collapse - critical for safe power sequencing in multi-rail systems. The bleeding FET has a typical ON-resistance of 100Ω, enabling sub-millisecond discharge of standard 10µF output caps without external components.
What is the thermal performance of the ISL9103AIRUAZ-T in its UTDFN package?
The ISL9103AIRUAZ-T in its 1.6×1.6mm UTDFN package has a typical junction-to-ambient thermal resistance (θJA) of 160°C/W under standard test conditions. It incorporates thermal shutdown at 130°C (with 30°C hysteresis), allowing automatic recovery at ~100°C. This enables reliable operation up to 500mA continuous load in compact layouts - provided the PCB includes adequate copper pour under the exposed thermal pad per the recommended land pattern in the datasheet.
Can the ISL9103AIRUAZ-T operate with a single Li-ion cell input?
Yes, the ISL9103AIRUAZ-T supports input voltages from 2.7V to 6.0V - fully covering the discharge curve of a single Li-ion cell (typically 4.2V–2.7V). Its 100% duty-cycle capability allows dropout operation down to <300mV at 500mA, enabling usable output regulation even as the cell voltage falls near termination. This makes ISL9103AIRUAZ-T ideal for direct integration into Li-ion-powered PDAs, cellular phones, and portable instruments without intermediate regulation stages.
ISL9103AIRUAZ-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:
- 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)
ISL9103AIRUAZ-T FAQ
1.How can I place an order for ISL9103AIRUAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9103AIRUAZ-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 ISL9103AIRUAZ-T reliable?
The price and inventory of ISL9103AIRUAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9103AIRUAZ-T is usually 5 days.
3.What payment methods are accepted for ISL9103AIRUAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9103AIRUAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9103AIRUAZ-T?
ISL9103AIRUAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9103AIRUAZ-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 ISL9103AIRUAZ-T?
For technical support, including ISL9103AIRUAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9103AIRUAZ-T requirements.
6.How does Aetrix verify that ISL9103AIRUAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9103AIRUAZ-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 ISL9103AIRUAZ-T meets industry standards.
7.What is the process for return or replacement of ISL9103AIRUAZ-T?
All ISL9103AIRUAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9103AIRUAZ-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 ISL9103AIRUAZ-T part is unused and in its original packaging.
Return procedure for ISL9103AIRUAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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