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Renesas ISL9108IRZ-T
- Part No.:
- ISL9108IRZ-T
- Manufacturer:
- Renesas
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL9108IRZ-T.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,067
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Product details
Overview
ISL9108IRZ-T from Intersil is a 1.5A, 1.6MHz synchronous buck regulator with integrated P- and N-channel MOSFETs, optimized for low-voltage microprocessor core power in space-constrained portable devices. It operates from 2.7V–5.5V input, delivers adjustable output down to 0.8V, and achieves up to 95% efficiency with 17µA quiescent current in Skip mode-enabling extended battery life in PDAs and cellular phones.
For engineers reviewing the ISL9108IRZ-T datasheet, ISL9108IRZ-T pinout, ISL9108IRZ-T application, or ISL9108IRZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Skip/forced PWM), real-world efficiency curves, and precise thermal and protection behavior per FN6612 Rev 0.00.
Technical Context
The ISL9108IRZ-T implements peak-current-mode PWM control with internal slope compensation and zero-cross sensing for skip-mode entry. Its dual-MOSFET architecture uses a 0.16Ω P-channel and 0.15Ω N-channel switch (at VIN = 2.7V, IO = 200mA) to minimize conduction loss and support 100% duty-cycle low-dropout operation.
It features digital soft-start (1.1ms typical), logic-controlled shutdown (<1µA), overcurrent protection via CSA-based peak limiting (2.1A typical), and thermal shutdown at 150°C with 25°C hysteresis. Unlike ISL9107IRZ-T, ISL9108IRZ-T omits PG and RSI pins-leaving pins 3 and 5 as no-connects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5A guaranteed-supports DSP core and microprocessor loads without external current boosting. |
| Input Voltage Range | 2.7V to 5.5V-compatible with single Li+ cell, three NiMH cells, or regulated 5V rails. |
| Quiescent Current | 17µA in Skip mode-maximizes light-load battery runtime in always-on subsystems. |
| Switching Frequency | 1.35–1.75MHz-enables use of compact 2.2µH inductors and <1cm² total PCB area. |
| Feedback Reference | 0.78–0.82V over –40°C to +85°C-sets precise output voltage via external resistor divider. |
| Shutdown Current | 0.05–2µA-ensures negligible battery drain during system sleep states. |
| Thermal Shutdown | 150°C trigger with 25°C hysteresis-prevents permanent damage under sustained overload or poor heatsinking. |
Pinout & Package
ISL9108IRZ-T is housed in an 8-lead, 2mm × 3mm DFN package with exposed thermal pad (L8.2x3). The package height is 0.9mm nominal, and the E-pad must be soldered to a solid ground plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Input supply | Accepts 2.7–5.5V; requires local 10µF ceramic decoupling to GND. |
| 2 EN | Enable control | Logic-high enables regulation; logic-low disables converter and discharges output capacitor. |
| 3 PG | No-connect (NC) | Not bonded internally-must remain floating; not usable for power-good signaling. |
| 4 MODE | Operation mode select | High/VIN = Skip mode (light-load efficiency); Low/GND = forced PWM (fixed 1.6MHz). |
| 5 RSI | No-connect (NC) | Not bonded internally-must remain floating; no reset functionality on ISL9108IRZ-T. |
| 6 FB | Feedback input | Monitors output via resistor divider; regulates to 0.8V reference with ±2% tolerance over temp. |
| 7 GND | Power and signal ground | Common return path; connects to E-pad for thermal and noise control. |
| 8 SW | Switching node | Drives external inductor; carries high di/dt-requires short, wide trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | P- and N-channel MOSFETs with 0.16Ω/0.15Ω ON-resistance (VIN=2.7V) reduce BOM count and improve full-load efficiency. |
| Selectably optimized light-load efficiency | Skip mode cuts quiescent current to 17µA while maintaining regulation-critical for standby power budgets. |
| Digital soft-start | 1.1ms controlled ramp prevents inrush current and stabilizes startup into large capacitive loads. |
| Full protection suite | Includes overcurrent (2.1A peak limit), thermal shutdown (150°C), and short-circuit detection (FB<0.2V). |
| Low-dropout 100% duty cycle | Enables operation down to VIN = VOUT + IOUT×RDS(ON)-extends usable battery range near end-of-discharge. |
Applications
| Mobile Baseband Processor Core | DSP Power Supply |
|---|---|
Use Scenario: Powers ARM9/ARM11 baseband processor cores in 3G/4G smartphones requiring dynamic voltage scaling between 1.0V–1.3V. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated core voltage with fast transient response to CPU load changes. Use Value: 1.6MHz switching and integrated FETs enable compact layout; Skip mode extends talk time by reducing idle current to 17µA. |
Use Scenario: Supplies fixed 1.2V or 1.5V to audio/video DSPs in portable media players during burst-mode decoding. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter with digital soft-start ensuring clean power-up without brownout or reset glitches. Use Value: 95% peak efficiency and 100% duty-cycle dropout support maintain stable output even as Li+ battery voltage falls below 3.0V. |
| PDAs and Palmtop Systems | Single-Cell Li+ Powered IoT Sensors |
Use Scenario: Generates 1.6V system rail for ARM-based PDA mainboards with intermittent display backlight and wireless connectivity. IC Role / Device Role / Timing Role: Main system regulator managing variable load profiles across UI, storage, and RF subsystems. Use Value: Forced PWM mode ensures consistent EMI profile during active use; Skip mode reduces average current draw during touch-screen idle periods. |
Use Scenario: Powers ultra-low-power sensor nodes (e.g., temperature/humidity) operating from coin-cell or small Li+ batteries for multi-year deployments. IC Role / Device Role / Timing Role: Primary power management IC enabling deep-sleep current <1µA and wake-up regulation within 1.1ms. Use Value: Shutdown current ≤2µA and 17µA Skip-mode IQ preserve battery capacity during >99% duty-cycle sleep intervals. |
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, 0.6V reference, 1.8A rating; smaller 2mm × 2mm WSON package; no internal soft-start. | Higher frequency allows smaller inductors but increases EMI sensitivity; lacks discharge-on-shutdown feature. | Prefer for space-constrained designs needing >1.5A or faster transient response; verify soft-start and discharge requirements. |
| RT8059NGQW | 1.5MHz, 1.5A, 0.6V reference, 25µA IQ in PFM; supports external sync; 3mm × 3mm QFN-10 package. | Includes sync input for EMI reduction; higher quiescent current than ISL9108IRZ-T's 17µA Skip mode. | Choose when system-level clock synchronization is required or when board layout permits larger QFN footprint. |
Compared with TPS62231DRVR and RT8059NGQW, ISL9108IRZ-T offers lower light-load IQ, integrated output discharge, and proven 2×3 DFN thermal performance-making it optimal for battery-sensitive handhelds where standby efficiency and compact thermal design are critical.
Availability
ISL9108IRZ-T is available at Aetrix Electronics and suitable for mobile baseband power, DSP supply, PDA system rails, and single-cell Li+ IoT sensor applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9108IRZ-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 analog and power management IC designer known for high-efficiency DC-DC solutions targeting portable and battery-powered systems.
The ISL9107/ISL9108 family was engineered specifically for low-voltage, high-efficiency core power in compact handheld electronics-emphasizing minimal quiescent current, integrated FETs, and robust thermal behavior in sub-3mm² packages.
FAQ
What is the maximum output current capability of the ISL9108IRZ-T?
The ISL9108IRZ-T is rated for 1.5A guaranteed continuous output current across its full operating temperature range (–40°C to +85°C). This rating assumes proper PCB layout with adequate copper area on the exposed thermal pad and use of recommended external components (2.2µH inductor, 10µF input/output capacitors). Peak current limit is 2.1A typical, providing margin against transient overloads without triggering shutdown.
Does the ISL9108IRZ-T include a power-good (PG) output function?
No, the ISL9108IRZ-T does not include a power-good output. Pin 3 (PG) is a no-connect (NC) and must remain unconnected and floating. This distinguishes it from the ISL9107IRZ-T, which integrates a 215ms-delayed PG signal. The ISL9108IRZ-T datasheet explicitly states that PG and RSI pins are not bonded for this variant.
How does the MODE pin affect ISL9108IRZ-T operation?
The MODE pin on ISL9108IRZ-T selects between two distinct operating modes: connecting MODE to VIN (or logic high) enables Skip mode for lowest quiescent current (17µA) at light loads, while connecting MODE to GND (or logic low) forces continuous PWM operation at ~1.6MHz regardless of load. This selection directly impacts efficiency vs. EMI trade-offs and must be set externally before power-up.
What is the minimum input voltage required for regulation at 1.6V output?
The ISL9108IRZ-T maintains regulation down to VIN = VOUT + IOUT × RDS(ON)_PCH. At 1.5A load and typical 0.16Ω P-channel ON-resistance (VIN = 2.7V), dropout is ~240mV-so minimum functional input is ~1.84V. However, undervoltage lockout (UVLO) disables operation below 2.5V (rising threshold), meaning practical minimum input is 2.5V for reliable startup and regulation.
Can the ISL9108IRZ-T safely discharge the output capacitor during shutdown?
Yes, the ISL9108IRZ-T actively discharges the output capacitor when the EN pin is pulled low. This internal discharge path prevents residual voltage from interfering with system sequencing or causing latch-up in downstream logic. Discharge time depends on output capacitance and load but is designed to bring VOUT below 0.4V within milliseconds-verified in typical application waveforms (Figure 6–7 of FN6612).
ISL9108IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
ISL9108IRZ-T FAQ
1.How can I place an order for ISL9108IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9108IRZ-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 ISL9108IRZ-T reliable?
The price and inventory of ISL9108IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9108IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL9108IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9108IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9108IRZ-T?
ISL9108IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9108IRZ-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 ISL9108IRZ-T?
For technical support, including ISL9108IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9108IRZ-T requirements.
6.How does Aetrix verify that ISL9108IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9108IRZ-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 ISL9108IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL9108IRZ-T?
All ISL9108IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9108IRZ-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 ISL9108IRZ-T part is unused and in its original packaging.
Return procedure for ISL9108IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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