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Renesas ISL9103IRUBZ-T
- Part No.:
- ISL9103IRUBZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9103IRUBZ-T.pdf
- Description:
- IC REG BUCK 1.5V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
ISL9103IRUBZ-T from Intersil is a 500mA, 2.4MHz synchronous buck converter optimized for low-voltage microprocessor power in compact battery-powered devices. It delivers fixed 1.5V output from 2.7V–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 core logic in WCDMA handsets and portable instruments.
For engineers reviewing the ISL9103IRUBZ-T datasheet, ISL9103IRUBZ-T pinout, ISL9103IRUBZ-T application, or ISL9103IRUBZ-T equivalent, key selection criteria include light-load efficiency (20µA IQ), ultrasmall 1.6×1.6mm µTDFN footprint, fixed 1.5V output accuracy (±3%), enable-controlled quick output discharge, and peak-current-mode PWM control for fast transient response.
Technical Context
The ISL9103IRUBZ-T implements peak-current-mode PWM control with internal slope compensation, enabling fast load transient response and cycle-by-cycle current limiting. Its architecture integrates a 0.45Ω P-MOSFET and 0.4Ω N-MOSFET to minimize conduction loss and external component count.
It operates in fixed-frequency 2.4MHz PWM mode under heavy load and automatically transitions to pulse-skipping (PFM) mode below ~10mA load, reducing switching loss and maintaining >85% efficiency at 1mA. The device includes zero-cross detection for skip-mode entry after 16 consecutive inductor current zero crossings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% over line, load, and temperature - ensures stable core supply for 1.5V logic domains without external feedback resistors. |
| Max Output Current | 500mA guaranteed minimum - supports moderate-power microprocessors and baseband ICs in handheld devices. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li+ cell (2.7–4.2V), three NiMH cells (~3.6V), or regulated 5V rails. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby/sleep states of portable electronics. |
| Switching Frequency | 2.4MHz nominal (1.9–2.75MHz range) - enables use of tiny 2.2µH inductors and 10µF ceramic capacitors, minimizing PCB area (<0.5cm² total solution). |
| Duty Cycle | 100% maximum - achieves <300mV dropout at 500mA, sustaining regulation as input voltage sags near output level. |
| Shutdown Current | <1µA logic-controlled - eliminates leakage during system off-state, critical for long-term battery storage. |
Pinout & Package
ISL9103IRUBZ-T is housed in a RoHS-compliant, 6-lead 1.6mm × 1.6mm ultra-thin dual flat no-lead (µTDFN) package with exposed thermal pad (PKG DWG # L6.1.6x1.6). The package supports high-density layout and efficient thermal dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input power supply | Accepts 2.7–6.0V; requires local 10µF ceramic decoupling to suppress high-frequency switching noise on battery or rail. |
| EN (Pin 2) | Enable control input | Active-high logic interface; pulls low to disable regulator and activate internal bleeding FET to discharge output capacitor within milliseconds. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating-no external connection or pull-up/down required. |
| FB (Pin 4) | Feedback reference node | Internally tied to 0.8V bandgap reference for fixed 1.5V output; not user-accessible-output is internally regulated without external resistor divider. |
| GND (Pin 5) | Power ground | Primary return path for input/output currents and IC bias; must be connected to solid ground plane adjacent to VIN and SW pins. |
| SW (Pin 6) | Switching node | Connects to inductor's high-side terminal; carries high di/dt square wave-requires short, wide trace and careful routing away from sensitive analog nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reduces conduction loss, and improves full-load efficiency up to 95% at 3.6VIN/1.5VOUT. |
| Digital soft-start | 1.2ms controlled ramp prevents inrush current and output overshoot during power-up, protecting downstream logic and capacitors. |
| Quick output discharge | Internal N-MOSFET bleeds output capacitor when EN = LOW, ensuring safe, rapid voltage collapse for sequencing-critical systems. |
| Overcurrent and thermal protection | Peak current limit (0.95A typ) and thermal shutdown at +130°C (30°C hysteresis) prevent damage during fault conditions without external circuitry. |
| Ultrasonic skip mode | Skips pulses at frequencies above 20kHz-avoids audible coil whine in consumer audio-sensitive devices like MP3 players. |
Applications
| Mobile Handset Power | Portable Instrument Core Supply |
|---|---|
Use Scenario: Powering application processor cores and memory interfaces in WCDMA handsets operating from single Li-ion cells. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, tightly regulated 1.5V to digital baseband and application processors. Use Value: 20µA quiescent current extends talk/standby time; 100% duty cycle maintains regulation down to 1.8V input, maximizing usable battery capacity. | Use Scenario: Supplying FPGA I/O banks and microcontroller peripherals in handheld test equipment with strict size constraints. IC Role / Device Role / Timing Role: Compact, high-efficiency DC-DC converter replacing linear regulators to reduce heat and extend battery life. Use Value: 2.4MHz switching allows 2.2µH inductor and 10µF ceramic caps-enabling <0.5cm² solution size ideal for palm-sized enclosures. |
| MP3 Player Audio SoC | PDA Application Processor Rail |
Use Scenario: Generating 1.5V supply for audio system-on-chip (SoC) in portable music players where audible noise must be avoided. IC Role / Device Role / Timing Role: Low-noise synchronous buck converter with ultrasonic skip mode preventing coil whine during playback pauses. Use Value: Skip-mode operation above 20kHz eliminates perceptible switching noise-critical for premium audio user experience. | Use Scenario: Providing stable 1.5V core voltage to ARM-based application processors in PDAs with dynamic workload profiles. IC Role / Device Role / Timing Role: Adaptive-efficiency regulator that switches between PWM and PFM modes based on real-time load demand. Use Value: Maintains >85% efficiency from 1mA to 500mA load-optimizing battery life across idle, UI interaction, and active computation phases. |
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, 1.8V–6.5V input, 1.5V fixed output, 400mA rated, 17µA IQ in PFM mode | Lower max current (400mA vs 500mA); slightly wider input range; smaller 2.0×2.0mm WSON package | Preferred for designs requiring higher switching frequency or tighter board space, but verify 400mA margin suffices for peak processor loads. |
| RT8059NGSP | 1.5MHz switching frequency, 2.5V–5.5V input, 1.5V fixed output, 600mA rated, 22µA IQ in skip mode | Lower switching frequency increases inductor size; higher current rating; same 1.6×1.6mm QFN package footprint | Selected when higher output current headroom is needed or when lower EMI sensitivity permits reduced switching frequency. |
Compared with ISL9103IRUBZ-T, TPS62231DRVR offers higher frequency and lower IQ but reduced current capability, while RT8059NGSP provides greater current headroom and identical package size at the cost of lower switching frequency and marginally higher IQ.
Availability
ISL9103IRUBZ-T is available at Aetrix Electronics and suitable for mobile handset power, portable instrument core supply, MP3 player audio SoC, and PDA application processor rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9103IRUBZ-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, designs high-performance analog and power management ICs for portable, industrial, and communications markets.
The ISL9103IRUBZ-T belongs to Intersil's low-IQ synchronous buck converter product line, engineered specifically for space- and battery-constrained handheld electronics requiring high light-load efficiency and minimal solution footprint.
FAQ
What is the output voltage tolerance of the ISL9103IRUBZ-T over temperature and line variations?
The ISL9103IRUBZ-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 1.5V output version and is guaranteed by internal trimming-no external components affect this tolerance.
Does the ISL9103IRUBZ-T require external feedback resistors to set the output voltage?
No, the ISL9103IRUBZ-T does not require external feedback resistors. It is a fixed-output variant delivering 1.5V; the FB pin is internally connected to the 0.8V reference and output node, eliminating the need for an external resistor divider. This simplifies layout and improves accuracy versus adjustable versions.
How does the ISL9103IRUBZ-T manage output capacitor discharge during shutdown?
When the EN pin is driven low, the ISL9103IRUBZ-T activates an internal N-channel bleeding MOSFET connected between the output and ground. This discharges the output capacitor rapidly-typically within tens of milliseconds-ensuring safe, controlled power-down for sequencing-critical systems.
What is the maximum junction temperature and thermal shutdown behavior of the ISL9103IRUBZ-T?
The ISL9103IRUBZ-T has a thermal shutdown threshold of +130°C (typical) with 30°C hysteresis. When junction temperature reaches +130°C, the device shuts down completely; it resumes normal operation-including soft-start-only after temperature falls to approximately +100°C, preventing thermal cycling during overload conditions.
Can the ISL9103IRUBZ-T operate with a 2.5V input supply while delivering 1.5V at 500mA?
Yes, the ISL9103IRUBZ-T supports 2.7V minimum input voltage per datasheet specifications. At 2.5V input, it falls below the recommended operating range and may not sustain 500mA output due to insufficient headroom for the P-MOSFET's RDS(on) drop and inductor DCR. Operation at 2.5V is not guaranteed and risks dropout or instability.
ISL9103IRUBZ-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):
- 1.5V
- 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)
ISL9103IRUBZ-T FAQ
1.How can I place an order for ISL9103IRUBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9103IRUBZ-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 ISL9103IRUBZ-T reliable?
The price and inventory of ISL9103IRUBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9103IRUBZ-T is usually 5 days.
3.What payment methods are accepted for ISL9103IRUBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9103IRUBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9103IRUBZ-T?
ISL9103IRUBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9103IRUBZ-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 ISL9103IRUBZ-T?
For technical support, including ISL9103IRUBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9103IRUBZ-T requirements.
6.How does Aetrix verify that ISL9103IRUBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9103IRUBZ-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 ISL9103IRUBZ-T meets industry standards.
7.What is the process for return or replacement of ISL9103IRUBZ-T?
All ISL9103IRUBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9103IRUBZ-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 ISL9103IRUBZ-T part is unused and in its original packaging.
Return procedure for ISL9103IRUBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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