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Renesas ISL9103IRUJZ-T
- Part No.:
- ISL9103IRUJZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9103IRUJZ-T.pdf
- Description:
- IC REG BUCK 2.8V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,566
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Product details
Overview
ISL9103IRUJZ-T from Intersil is a 500mA, 2.4MHz synchronous buck converter optimized for low-voltage microprocessors in space-constrained portable devices. It delivers fixed 2.8V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrated P/N-channel MOSFETs. It powers WCDMA handsets and mobile phones requiring high light-load efficiency.
For engineers reviewing the ISL9103IRUJZ-T datasheet, ISL9103IRUJZ-T pinout, ISL9103IRUJZ-T application, or ISL9103IRUJZ-T equivalent, key selection criteria include its 2.4MHz PWM frequency enabling compact 2.2µH inductors, 2.8V fixed output accuracy (±3%), ultralow shutdown current (<1µA), and thermal shutdown at 130°C with 30°C hysteresis.
Technical Context
The ISL9103IRUJZ-T employs peak-current-mode PWM control with internal slope compensation for fast transient response and cycle-by-cycle current limiting. Its oscillator operates at 2.4MHz (1.9–2.75MHz range) under heavy load and automatically transitions to skip mode (PFM) at light load to minimize switching loss.
It integrates matched P-Channel (0.45Ω typ @ 3.6V) and N-Channel (0.4Ω typ @ 3.6V) MOSFETs, supports 100% duty-cycle low-dropout operation, and includes zero-cross sensing for skip-mode entry after 16 consecutive zero-current cycles at the SW node.
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 minimum - supports baseband processors and RF transceivers in cellular handsets. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li+ cell (2.7–4.2V), three NiMH cells, or regulated 5V supply. |
| Switching Frequency | 2.4MHz typical (1.9–2.75MHz) - enables use of small 2.2µH inductors and 10µF ceramic capacitors, reducing PCB area to <0.5cm². |
| Quiescent Current | 20µA typical in skip mode - maximizes battery runtime in standby and low-activity states. |
| Shutdown Current | <1µA logic-controlled - prevents battery drain during system sleep or power-off. |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, extending usable battery life down to low VIN. |
| Thermal Shutdown | 130°C threshold with 30°C hysteresis - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
ISL9103IRUJZ-T is housed in a Pb-free, RoHS-compliant 6-pin 1.6mm × 1.6mm µTDFN package (PKG DWG # L6.1.6x1.6), with exposed thermal pad for enhanced heat dissipation in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input power supply | Accepts 2.7–6.0V; requires 10µF ceramic decoupling capacitor placed adjacent to pin to suppress high-frequency switching noise. |
| EN (Pin 2) | Enable control | Active-high logic input; drives internal reference and soft-start when high; discharges output capacitor when low - enables precise power sequencing. |
| NC (Pin 3) | No connect | Internally unconnected; must be left floating - no external connection or pull-up/down required. |
| FB (Pin 4) | Feedback reference | Internally tied to 2.8V output for fixed-version operation; not user-accessible - eliminates external resistor divider and associated tolerance errors. |
| GND (Pin 5) | Power ground | Primary return path for input/output currents and IC bias; must be connected to solid ground plane with low-inductance routing. |
| SW (Pin 6) | Switching node | Connects to inductor's high-side terminal; carries high di/dt square wave - requires short, wide trace and isolation from noise-sensitive nodes (e.g., FB). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-MOSFETs | 0.45Ω/0.4Ω RDS(on) typ @ 3.6V - eliminates external power switches, reduces BOM count, and improves full-load efficiency up to 95%. |
| Digital soft-start | 1.2ms controlled ramp - prevents inrush current into output capacitors, avoiding input rail sag and system reset during power-up. |
| Quick output discharge | Internal bleeding FET activated on EN low - safely discharges VOUT to GND within milliseconds, meeting fast-power-down requirements in handhelds. |
| Peak current limiting | 0.95A typical current limit - provides robust short-circuit protection without external sense resistors or timing components. |
| Ultrasonic skip mode | Not implemented in ISL9103IRUJZ-T (only ISL9103A variants) - avoids audible coil whine while maintaining 20µA IQ in light-load PFM operation. |
Applications
| Mobile Phone Power Management | WCDMA Handset Baseband Supply |
|---|---|
Use Scenario: Powers application processor I/O and memory interface in slim-profile 3G smartphones operating from single Li+ battery. IC Role / Device Role / Timing Role: Primary 2.8V synchronous buck regulator delivering regulated core voltage with dynamic load response to CPU activity bursts. Use Value: 2.4MHz switching minimizes inductor size to fit tight board real estate; 20µA skip-mode IQ extends standby time beyond 7 days on 800mAh battery. |
Use Scenario: Supplies stable 2.8V rail to WCDMA transceiver analog front-end and digital baseband ASIC in handset designs. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter supporting rapid load transients during RF transmit/receive switching. Use Value: 100% duty-cycle operation maintains regulation down to 3.1V input, preserving call continuity as battery discharges from 4.2V to 3.0V. |
| Portable Instrument Core Supply | PDA Application Processor Rail |
Use Scenario: Provides clean, low-noise 2.8V supply for precision ADCs and sensor signal chains in handheld test equipment. IC Role / Device Role / Timing Role: Low-ripple, thermally robust buck converter with integrated thermal shutdown protecting sensitive analog circuitry. Use Value: 130°C thermal shutdown with 30°C hysteresis prevents damage during extended field use in warm environments; <300mV dropout preserves measurement accuracy near battery EOL. |
Use Scenario: Generates main 2.8V domain for ARM-based PDA application processors and display controllers. IC Role / Device Role / Timing Role: Compact, high-efficiency step-down regulator enabling thin form factors and multi-day battery life. Use Value: Complete solution occupies <0.5cm² PCB area; integrated soft-start prevents brownout during cold boot; quick discharge meets USB suspend/resume timing specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3MHz fixed-frequency, 300mA rated, 1.8–6.5V input, 2.8V fixed output, 22µA IQ in PFM | Lower max current limits use in lower-power peripherals; higher fSW allows smaller inductors but increases EMI sensitivity | Select when 300mA suffices and board layout prioritizes minimal inductor footprint over peak load capability. |
| RT8059NGQW | 1.5MHz, 600mA, 2.5–5.5V input, adjustable output (0.6–5.5V), 25µA IQ in PSM mode | Requires external feedback resistors; wider input range suits dual-cell NiMH; lacks integrated output discharge | Choose for designs needing adjustable output or broader input compatibility, accepting added BOM cost and layout complexity. |
Compared with TPS62231DRYR and RT8059NGQW, the ISL9103IRUJZ-T uniquely combines 500mA capability, fixed 2.8V output, 2.4MHz operation, and integrated output discharge in a 1.6×1.6mm package-making it optimal for space-constrained, battery-life-critical 2.8V rail applications where simplicity and reliability are paramount.
Availability
ISL9103IRUJZ-T is available at Aetrix Electronics and suitable for mobile phone power management, WCDMA handset baseband supply, and portable instrument core supply requiring stable component supply across production lifecycles.
Supply support for ISL9103IRUJZ-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 U.S.-based semiconductor company specializing in high-performance analog and power management ICs, acquired by Renesas Electronics in 2017.
The ISL9103 series was designed specifically for ultra-compact, battery-powered portable electronics requiring high efficiency at light loads and minimal PCB footprint - targeting cellular handsets, PDAs, and portable instrumentation.
FAQ
What is the output voltage of the ISL9103IRUJZ-T and is it adjustable?
The ISL9103IRUJZ-T provides a fixed 2.8V output voltage with ±3% accuracy over temperature and line conditions. It is not adjustable - the FB pin is internally connected to the 2.8V output, eliminating the need for external feedback resistors. This simplifies design, improves accuracy, and reduces component count compared to adjustable variants like ISL9103IRUAZ-T.
Does the ISL9103IRUJZ-T support 100% duty-cycle operation and what is its benefit?
Yes, the ISL9103IRUJZ-T supports 100% duty-cycle operation, enabling dropout voltage below 300mV at 500mA load. This extends usable battery life by maintaining regulation as the input voltage declines - for example, sustaining 2.8V output even when a single Li+ cell drops to 3.1V, which is critical for uninterrupted operation in mobile handsets.
How does the ISL9103IRUJZ-T manage efficiency at light loads?
The ISL9103IRUJZ-T automatically enters skip mode (PFM) under light loads, reducing switching frequency to minimize switching losses. In this mode, it draws only 20µA typical quiescent current - significantly improving light-load efficiency and maximizing battery runtime in standby or low-activity states common in portable devices.
What protection features are integrated into the ISL9103IRUJZ-T?
The ISL9103IRUJZ-T integrates overcurrent protection (OCP) with 0.95A typical peak current limit, thermal shutdown at 130°C with 30°C hysteresis, undervoltage lockout (UVLO) at 2.5V, and short-circuit protection via FB monitoring. It also includes internal digital soft-start and logic-controlled shutdown with <1µA leakage current.
Is the ISL9103IRUJZ-T pin-compatible with other variants in the ISL9103 family?
Yes, all ISL9103 and ISL9103A variants - including ISL9103IRUJZ-T, ISL9103IRUNZ-T, and ISL9103AIRUJZ-T - share identical 6-pin 1.6×1.6mm µTDFN packaging and pinout. However, fixed-output versions differ in FB configuration and ultrasonic skip mode presence, so direct substitution requires verification of output voltage and functional requirements.
ISL9103IRUJZ-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:
- 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:
- 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)
ISL9103IRUJZ-T FAQ
1.How can I place an order for ISL9103IRUJZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9103IRUJZ-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 ISL9103IRUJZ-T reliable?
The price and inventory of ISL9103IRUJZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9103IRUJZ-T is usually 5 days.
3.What payment methods are accepted for ISL9103IRUJZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9103IRUJZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9103IRUJZ-T?
ISL9103IRUJZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9103IRUJZ-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 ISL9103IRUJZ-T?
For technical support, including ISL9103IRUJZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9103IRUJZ-T requirements.
6.How does Aetrix verify that ISL9103IRUJZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9103IRUJZ-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 ISL9103IRUJZ-T meets industry standards.
7.What is the process for return or replacement of ISL9103IRUJZ-T?
All ISL9103IRUJZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9103IRUJZ-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 ISL9103IRUJZ-T part is unused and in its original packaging.
Return procedure for ISL9103IRUJZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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