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Renesas ISL9103IRUCZ-T
- Part No.:
- ISL9103IRUCZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9103IRUCZ-T.pdf
- Description:
- IC REG BUCK 1.8V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,114
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Product details
Overview
ISL9103IRUCZ-T from Intersil is a 500mA, 2.4MHz synchronous buck converter optimized for low-voltage microprocessors in space-constrained portable devices. It delivers a fixed 1.8V output from 2.7V–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrates P- and N-channel MOSFETs with 0.45Ω/0.4Ω typical ON-resistance. It powers core logic in WCDMA handsets and mobile phones.
For engineers reviewing the ISL9103IRUCZ-T datasheet, ISL9103IRUCZ-T pinout, ISL9103IRUCZ-T application, or ISL9103IRUCZ-T equivalent, key selection criteria include fixed 1.8V output accuracy (±3%), ultrasmall 1.6×1.6mm µTDFN package, peak-current-mode PWM control, internal soft-start, and quick-output-capacitor discharge on disable - all critical for battery-powered handheld power rail design.
Technical Context
The ISL9103IRUCZ-T implements peak-current-mode PWM control with slope compensation for fast transient response and pulse-by-pulse current limiting. Its oscillator operates at 2.4MHz (1.9–2.75MHz range), enabling use of compact 2.2µH inductors and 10µF ceramic capacitors.
Under light load, it enters skip mode (PFM) after detecting 16 consecutive zero-crossings at SW, reducing switching frequency to minimize loss; under heavy load, it reverts to fixed-frequency PWM. The EN pin enables power sequencing, while internal digital soft-start controls output voltage ramp rate and limits inrush current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% over line, load, and temperature - ensures stable core supply for 1.8V I/O and logic rails. |
| Max Output Current | 500mA guaranteed minimum - supports processor cores and baseband ICs in compact handhelds. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li+ cell (2.7–4.2V), three NiMH cells, or regulated 5V rail. |
| Switching Frequency | 2.4MHz typical (1.9–2.75MHz) - allows ultra-small external components and avoids audible noise band. |
| Quiescent Current | 20µA typical in skip mode - maximizes battery runtime during standby and low-activity states. |
| Duty Cycle | 100% maximum - enables <300mV dropout at 500mA, extending usable battery life down to ~2.1V input. |
| Shutdown Current | <1µA logic-controlled - eliminates leakage when disabled, critical for zero-power sleep modes. |
| Thermal Shutdown | 130°C threshold with 30°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
ISL9103IRUCZ-T is housed in a Pb-free, RoHS-compliant 6-pin 1.6mm × 1.6mm µTDFN package (Intersil pkg drawing L6.1.6x1.6), occupying <0.5cm² total board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 2.7–6.0V; requires 10µF ceramic capacitor to GND for high-frequency decoupling and stability. |
| EN (Pin 2) | Enable control input | Active-high logic; drives device into shutdown and activates internal bleeding FET to discharge output capacitor. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating - no external tie required or recommended. |
| FB (Pin 4) | Feedback reference node | Internally tied to 1.8V output for fixed-version operation; not user-adjustable - simplifies layout and reduces BOM count. |
| GND (Pin 5) | Power ground return | Primary ground reference for internal circuits and power stage; must connect to low-impedance solid ground plane. |
| SW (Pin 6) | Switching node | Connects to inductor's high-side terminal; carries high di/dt square wave - requires short, wide trace and minimal loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous MOSFETs | P-Channel (0.45Ω typ) + N-Channel (0.4Ω typ) switches eliminate external FETs and reduce component count by ≥4. |
| Internal digital soft-start | 1.2ms typical startup time - prevents inrush current and output overshoot during power-up sequencing. |
| Quick output capacitor discharge | Active bleeding FET discharges VOUT to <1% within 1ms after EN deactivation - meets fast-power-down requirements. |
| Peak-current-mode PWM control | Provides inherent cycle-by-cycle current limiting and superior load transient response vs. voltage-mode control. |
| Overcurrent & thermal protection | 0.95A typical peak current limit and 130°C thermal shutdown with 30°C hysteresis ensure robust fault recovery. |
Applications
| Mobile Phone Core Power | WCDMA Handset Baseband Supply |
|---|---|
|
Use Scenario: Powers ARM-based application processor core and memory I/O in slim-form-factor cellular handsets. IC Role / Device Role / Timing Role: Primary 1.8V synchronous buck regulator delivering up to 500mA with tight regulation and fast transient response. Use Value: Enables extended talk time via 20µA skip-mode IQ and maintains system stability during burst-mode RF transmission. |
Use Scenario: Supplies 1.8V rail to WCDMA transceiver baseband ICs requiring low-noise, high-efficiency conversion from single Li+ cell. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter with 2.4MHz switching - avoids interference with RF bands and minimizes EMI filtering needs. Use Value: Delivers >90% efficiency at 300mA load while occupying <0.5cm², supporting miniaturized RF module integration. |
| Portable Media Player Logic Rail | PDA Application Processor Supply |
|
Use Scenario: Generates clean 1.8V supply for NAND flash controller and audio codec in MP3 players. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with integrated MOSFETs and internal soft-start - eliminates external gate drivers and timing components. Use Value: Reduces bill-of-materials cost and PCB area versus discrete solutions while maintaining ±3% output accuracy across temperature. |
Use Scenario: Provides regulated 1.8V core voltage to ARM9/ARM11 processors in palm-sized PDAs with limited battery capacity. IC Role / Device Role / Timing Role: Synchronous buck converter with 100% duty-cycle capability - sustains operation down to 2.1V input as battery discharges. Use Value: Extends usable battery life by >15% compared to non-synchronous alternatives due to lower conduction losses. |
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 | 1.8V fixed output, 600mA rating, 3.6MHz switching, 17µA IQ - higher frequency but tighter VIN min (2.05V). | Requires smaller inductor (1µH); better suited for designs needing faster transient response and tighter input range. | Select TPS62231DRYR if board space allows smaller magnetics and input stays above 2.05V; verify thermal performance at 500mA continuous. |
| RT8059GJ6 | 1.8V fixed output, 500mA rating, 1.5MHz switching, 22µA IQ - lower frequency, larger external components required. | Higher EMI susceptibility near 1.5MHz; less suitable for ultra-thin devices where 2.4MHz helps avoid audible noise. | Choose RT8059GJ6 only if legacy 1.5MHz design reuse is prioritized; ISL9103IRUCZ-T offers superior size and noise performance. |
Compared with TPS62231DRYR and RT8059GJ6, the ISL9103IRUCZ-T provides optimal balance of 1.6×1.6mm footprint, 2.4MHz operation for minimal passive size, and proven 20µA light-load IQ - making it the preferred choice for next-gen compact handheld power rails where board area and battery life are co-constrained.
Availability
ISL9103IRUCZ-T is available at Aetrix Electronics and suitable for mobile phone core power, WCDMA handset baseband supply, and portable media player logic rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9103IRUCZ-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 analog and power management semiconductor company, now part of Renesas Electronics, specializing in high-efficiency DC/DC converters, precision analog ICs, and interface solutions.
The ISL9103IRUCZ-T belongs to Intersil's ISL9103 family of ultra-compact synchronous buck regulators designed specifically for battery-powered handheld electronics requiring minimal PCB area, low quiescent current, and fast transient response.
FAQ
What is the output voltage tolerance of the ISL9103IRUCZ-T over temperature and line conditions?
The ISL9103IRUCZ-T provides ±3% output voltage accuracy over the full operating temperature range (–40°C to +85°C) and input line variation (2.7V to 6.0V). This specification applies specifically to its fixed 1.8V output version and is guaranteed without requiring external feedback resistors - ensuring consistent core rail stability across real-world environmental and battery discharge conditions.
Does the ISL9103IRUCZ-T support 100% duty-cycle operation, and what is its practical dropout voltage?
Yes, the ISL9103IRUCZ-T supports 100% duty-cycle operation to maintain regulation as input voltage drops. At 500mA load, its dropout voltage is less than 300mV - calculated as the product of load current and the P-channel MOSFET's typical 0.45Ω ON-resistance. This enables continued operation down to ~2.1V input when powering a 1.8V rail, maximizing usable battery capacity.
How does the ISL9103IRUCZ-T manage efficiency at light loads, and what is its quiescent current?
The ISL9103IRUCZ-T automatically enters skip mode (PFM) under light loads, reducing switching frequency to minimize switching losses. Its typical quiescent supply current in this mode is 20µA - measured at no load and VIN = 6.0V. This ultra-low IQ directly extends battery life in standby and intermittent-use scenarios common in mobile phones and portable media players.
What protection features are integrated into the ISL9103IRUCZ-T?
The ISL9103IRUCZ-T integrates peak current limiting (0.95A typical), thermal shutdown (130°C threshold with 30°C hysteresis), undervoltage lockout (2.5V rising threshold), and short-circuit protection via FB monitoring. Additionally, it features logic-controlled shutdown (<1µA current) and automatic output capacitor discharge upon disable - providing comprehensive fault coverage for portable power systems.
Is the ISL9103IRUCZ-T pin-compatible with other variants in the ISL9103 family?
Yes, the ISL9103IRUCZ-T shares identical 6-pin 1.6×1.6mm µTDFN packaging and pinout with all ISL9103 and ISL9103A variants, including ISL9103IRUNZ-T (3.3V), ISL9103IRUJZ-T (2.8V), and ISL9103AIRUCZ-T (1.8V with ultrasonic skip mode). This allows direct substitution within the same footprint when output voltage or ultrasonic operation requirements change.
ISL9103IRUCZ-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):
- 1.8V
- 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)
ISL9103IRUCZ-T FAQ
1.How can I place an order for ISL9103IRUCZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9103IRUCZ-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 ISL9103IRUCZ-T reliable?
The price and inventory of ISL9103IRUCZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9103IRUCZ-T is usually 5 days.
3.What payment methods are accepted for ISL9103IRUCZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9103IRUCZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9103IRUCZ-T?
ISL9103IRUCZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9103IRUCZ-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 ISL9103IRUCZ-T?
For technical support, including ISL9103IRUCZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9103IRUCZ-T requirements.
6.How does Aetrix verify that ISL9103IRUCZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9103IRUCZ-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 ISL9103IRUCZ-T meets industry standards.
7.What is the process for return or replacement of ISL9103IRUCZ-T?
All ISL9103IRUCZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9103IRUCZ-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 ISL9103IRUCZ-T part is unused and in its original packaging.
Return procedure for ISL9103IRUCZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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