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Renesas ISL9103IRUAZ-T
- Part No.:
- ISL9103IRUAZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9103IRUAZ-T.pdf
- Description:
- IC REG BUCK ADJ 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,271
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Product details
Overview
ISL9103IRUAZ-T from Intersil is a 500mA, 2.4MHz synchronous buck converter optimized for low-voltage microprocessors in compact battery-powered devices. It operates from 2.7V to 6.0V input, delivers adjustable output down to 0.8V via external resistor divider, and features 20µA quiescent current in skip mode for extended battery life - used in WCDMA handsets and portable instruments.
For engineers reviewing the ISL9103IRUAZ-T datasheet, ISL9103IRUAZ-T pinout, ISL9103IRUAZ-T application, or ISL9103IRUAZ-T equivalent, key selection considerations include its 6-pin µTDFN package, internal P/N-channel MOSFETs, 100% duty-cycle low-dropout operation, and integrated soft-start and quick-output-discharge functionality.
Technical Context
The ISL9103IRUAZ-T implements peak-current-mode PWM control with internal slope compensation for fast transient response and cycle-by-cycle current limiting. Its feedback loop uses a precision 0.8V bandgap reference and supports adjustable output via external resistive divider connected to the FB pin.
Under light load, it autonomously enters skip mode (PFM) after detecting 16 consecutive zero-crossings at the SW node, reducing switching frequency to minimize losses. At heavy load, it reverts to fixed 2.4MHz PWM operation with typical efficiency up to 95% at 500mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6.0V - supports single Li+ cell, three NiMH cells, or regulated 5V rail without external LDO pre-regulation. |
| Output Current | 500mA guaranteed - sufficient to power core logic of low-power microcontrollers and baseband processors. |
| Switching Frequency | 2.4MHz (typ) - enables use of small 2.2µH inductor and 10µF ceramic capacitors, minimizing PCB area to <0.5cm². |
| Quiescent Current | 20µA in skip mode - maximizes battery runtime in standby or low-activity states of portable equipment. |
| Feedback Reference | 0.8V ±2% over temperature - provides stable, accurate output voltage setting for adjustable configurations. |
| Duty Cycle | 100% maximum - achieves dropout voltage <300mV at 500mA, extending usable battery range near end-of-discharge. |
| Shutdown Current | <1µA - ensures negligible battery drain when disabled via EN pin, critical for always-on subsystems. |
Pinout & Package
ISL9103IRUAZ-T is housed in a RoHS-compliant 6-lead 1.6mm × 1.6mm µTDFN package (PKG DWG # L6.1.6x1.6), with exposed thermal pad for enhanced heat dissipation in space-constrained 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 GND for noise suppression and stability. |
| EN (Pin 2) | Enable control | Active-high logic input; asserts soft-start on rising edge and discharges output capacitor when pulled low. |
| NC (Pin 3) | No-connect | Internally unconnected; must be left floating - no external tie or pull-up/down required. |
| FB (Pin 4) | Feedback input | Connects to resistor divider for adjustable output; senses 0.8V reference - sets VOUT = 0.8V × (1 + R1/R2). |
| GND (Pin 5) | Ground reference | Primary return path for power and signal; must be tied directly to solid ground plane for EMI and thermal performance. |
| SW (Pin 6) | Switching node | Drives external inductor; carries high di/dt pulses - requires short, wide trace routing away from sensitive analog paths. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-channel MOSFETs | 0.45Ω/0.40Ω (P/N) ON-resistance at VIN = 3.6V - eliminates external power switches and reduces BOM count and layout complexity. |
| Digital soft-start | 1.2ms typical ramp time - prevents inrush current and output overshoot during power-up sequencing. |
| Quick output discharge | Internal N-channel bleeding FET - actively discharges output capacitor when EN is low, ensuring safe power-down in multi-rail systems. |
| Overcurrent & thermal protection | Peak current limit ≥0.7A and thermal shutdown at 130°C (30°C hysteresis) - protects IC and system under fault conditions without external circuitry. |
| Ultrasonic skip mode | Not implemented - ISL9103IRUAZ-T is ISL9103 (not ISL9103A), so skip mode operates below audible range but lacks ultrasonic frequency enforcement. |
Applications
| Mobile Handset Power Management | Portable Instrument Core Supply |
|---|---|
|
Use Scenario: Powers baseband processor and RF transceiver in WCDMA handsets operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.2V–2.8V core voltage with dynamic load handling during transmit bursts. Use Value: 2.4MHz switching minimizes inductor size; 20µA quiescent current extends talk-time between charges. |
Use Scenario: Supplies configurable logic and ADC/DAC in handheld test equipment with tight board space constraints. IC Role / Device Role / Timing Role: Adjustable-output buck converter generating precise 0.8V–3.3V rails from shared 3.6V battery bus. Use Value: 0.8V FB reference and ±2% accuracy enable reliable low-voltage digital operation; 100% duty cycle maintains regulation down to 2.8V input. |
| PDA System-on-Chip (SoC) Rail | MP3 Player Audio Codec Supply |
|
Use Scenario: Generates 1.5V core voltage for ARM-based PDA SoC with variable processing load and sleep modes. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter managing transitions between active, idle, and deep-sleep states. Use Value: Automatic skip-to-PWM mode switching ensures >90% efficiency across 1mA–500mA load range, optimizing energy per cycle. |
Use Scenario: Provides clean, low-noise 1.8V supply to audio codec in battery-powered MP3 players. IC Role / Device Role / Timing Role: Low-ripple synchronous buck regulator with fast transient response to handle headphone driver current spikes. Use Value: Integrated soft-start and output discharge prevent pop/click artifacts during playback start/stop; 6-pin µTDFN fits ultra-thin form factor. |
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 | 3MHz switching frequency, 400mA output, 1.8V fixed output only - no adjustable version; 17µA IQ in PFM mode. | Fixed-output only; lacks FB pin flexibility and quick-discharge function - unsuitable where programmable voltage or controlled shutdown is required. | Select when fixed 1.8V rail suffices and higher switching frequency justifies trade-off in output adjustability and discharge capability. |
| RT8059NGSP | 1.5MHz, 600mA, adjustable output; 25µA IQ in skip mode; includes enable and power-good - no integrated output discharge. | Lower switching frequency increases inductor size; missing quick-bleed function limits use in systems requiring rapid output collapse. | Prefer for cost-sensitive designs needing higher current headroom but tolerating larger passive components and no active output discharge. |
Compared with TPS62231DRVR and RT8059NGSP, the ISL9103IRUAZ-T uniquely combines adjustable output, 20µA ultra-low IQ, integrated output discharge, and 2.4MHz operation in a 1.6×1.6mm footprint - making it optimal for compact, battery-life-critical applications requiring design flexibility.
Availability
ISL9103IRUAZ-T is available at Aetrix Electronics and suitable for mobile handsets, portable instrumentation, PDAs, MP3 players, and WCDMA terminals requiring stable component supply and long-term production continuity.
Supply support for ISL9103IRUAZ-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 (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in high-performance analog and power management ICs for portable and industrial applications.
The ISL9103IRUAZ-T belongs to Intersil's ISL9103 family of high-efficiency, low-IQ buck converters designed specifically for space-constrained, battery-powered consumer electronics demanding minimal quiescent power and robust light-load performance.
FAQ
What output voltage does ISL9103IRUAZ-T support?
The ISL9103IRUAZ-T is an adjustable-output buck converter with no internal feedback divider. It uses the FB pin and an external resistor network to set output voltage from 0.8V to VIN − VDO. Typical configurations include 1.2V, 1.5V, 1.8V, and 2.5V - all derived from the 0.8V reference using VOUT = 0.8V × (1 + R1/R2). The ISL9103IRUAZ-T data sheet specifies ±2% FB voltage accuracy over temperature and line.
Does ISL9103IRUAZ-T include output capacitor discharge functionality?
Yes, the ISL9103IRUAZ-T integrates a dedicated N-channel bleeding MOSFET that actively discharges the output capacitor when the EN pin is driven low. This feature ensures rapid and controlled collapse of VOUT, preventing latch-up or unintended operation in multi-rail systems - a key differentiator versus basic buck regulators lacking this function.
What is the maximum junction temperature and thermal protection behavior of ISL9103IRUAZ-T?
The ISL9103IRUAZ-T incorporates thermal shutdown with a typical trigger point of +130°C and 30°C hysteresis. When junction temperature exceeds +130°C, the device disables switching and holds in shutdown until temperature falls to approximately +100°C, at which point it automatically restarts with soft-start. This protects against sustained overload or poor heatsinking in sealed enclosures.
Can ISL9103IRUAZ-T operate with 100% duty cycle, and what is the resulting dropout voltage?
Yes, the ISL9103IRUAZ-T supports 100% duty cycle operation to maintain regulation as input voltage approaches output voltage. At 500mA load, dropout voltage is determined by the P-channel MOSFET's ON-resistance (0.45Ω typ at VIN = 3.6V), yielding <300mV total drop - enabling usable operation down to ~2.8V input for a 2.5V output rail.
How does ISL9103IRUAZ-T transition between PWM and skip modes?
The ISL9103IRUAZ-T monitors the SW node for 16 consecutive zero crossings to enter skip mode under light load. In skip mode, it pulses at reduced effective frequency while maintaining clock synchronization. It exits skip mode and resumes fixed 2.4MHz PWM when output voltage drops 1.5% below nominal - ensuring seamless, automatic mode switching without external control.
ISL9103IRUAZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
ISL9103IRUAZ-T FAQ
1.How can I place an order for ISL9103IRUAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9103IRUAZ-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 ISL9103IRUAZ-T reliable?
The price and inventory of ISL9103IRUAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9103IRUAZ-T is usually 5 days.
3.What payment methods are accepted for ISL9103IRUAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9103IRUAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9103IRUAZ-T?
ISL9103IRUAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9103IRUAZ-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 ISL9103IRUAZ-T?
For technical support, including ISL9103IRUAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9103IRUAZ-T requirements.
6.How does Aetrix verify that ISL9103IRUAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9103IRUAZ-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 ISL9103IRUAZ-T meets industry standards.
7.What is the process for return or replacement of ISL9103IRUAZ-T?
All ISL9103IRUAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9103IRUAZ-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 ISL9103IRUAZ-T part is unused and in its original packaging.
Return procedure for ISL9103IRUAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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