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Renesas ISL91106IIAZ-T
- Part No.:
- ISL91106IIAZ-T
- Manufacturer:
- Renesas
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
ISL91106IIAZ-T.pdf
- Description:
- IC REG BCK BST ADJ/1V 2A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,924
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Product details
Overview
ISL91106IIAZ-T from Renesas (formerly Intersil) is a highly integrated synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A output current at 3.3V with 1.8V–5.5V input range, 2.5MHz switching frequency, and 45µA no-load quiescent current-designed for power amplifiers in 3G/4G RF front-ends.
For engineers reviewing the ISL91106IIAZ-T datasheet, ISL91106IIAZ-T pinout, ISL91106IIAZ-T application, or ISL91106IIAZ-T equivalent, key selection criteria include automatic buck/boost mode transition behavior, bypass mode enablement via MODE1/MODE2 pins, WLCSP-16 package footprint compatibility, and fixed 3.3V output configuration.
Technical Context
The ISL91106IIAZ-T implements a fully synchronous 4-switch topology enabling seamless, disturbance-free transitions between buck and boost operating modes without external control. Its internal logic interprets MODE1/MODE2 states to select bypass, forced PWM, or auto-mode operation.
It integrates over-temperature, overcurrent, and undervoltage protection circuits and supports fixed 3.3V output without external feedback resistors-confirmed by the "IIAZ" suffix denoting 3.3V fixed-output variant in the ISL91106 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-polymer, or dual-cell NiMH battery inputs without pre-regulation. |
| Output Voltage | Fixed 3.3V - eliminates need for external resistor divider; verified by "IIAZ" suffix per datasheet nomenclature. |
| Max Output Current | 2A at PVIN = 2.8V, VOUT = 3.3V - sufficient for PA biasing in LTE/WCDMA power amplifier stages. |
| Switching Frequency | 2.5MHz - enables use of compact 1µH inductor and small ceramic capacitors, reducing total solution size. |
| Quiescent Current | 45µA - maintains high light-load efficiency during device sleep or low-power idle states. |
| Operating Modes | Buck, Boost, Bypass, Forced PWM - selected via MODE1/MODE2 logic levels; bypass mode reduces conduction loss to near-zero. |
| Protection Features | Thermal shutdown, cycle-by-cycle overcurrent, input UVLO - ensures robust operation under fault conditions without external circuitry. |
Pinout & Package
Package: 2.15mm × 1.51mm, 16-bump Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch and bottom-side thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 1.8V–5.5V; connects to bulk capacitor and battery source. |
| PVIN | Power input for internal LDOs and gate drivers | Must be tied to VIN or decoupled separately if noise-sensitive; powers control logic and high-side switches. |
| VOUT | Regulated output node | Delivers fixed 3.3V to load; connects directly to PA VCC or system rail. |
| GND | Analog ground reference | Low-noise return for feedback and control circuits; separate from PGND in layout best practice. |
| PGND | Power ground return | High-current return path for LX1/LX2 switches; must be connected to thermal pad and inductor ground. |
| LX1 / LX2 | Switch node terminals | Drive external inductor center-tap; require low-inductance routing and tight loop area with input/output caps. |
| MODE1 / MODE2 | Digital mode selection inputs | Set bypass (00), EN+PWM (10), or EN+Auto (11); pulled high/low via GPIO or resistors. |
| EN | Enable control input | Active-high; enables regulator when MODE1/MODE2 are not in bypass; internally pulled down. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Zero-output-voltage glitch during VIN crossing VOUT; eliminates need for external sequencing or supervision. |
| Selectably enabled bypass mode | Direct conduction path replaces switching regulation, cutting IQ to ~1µA and eliminating switching losses. |
| Single-inductor 4-switch architecture | Reduces BOM count vs. traditional buck-boost; avoids magnetic coupling issues and simplifies PCB layout. |
| 2.5MHz constant-frequency operation | Enables <1mm² inductor footprint and sub-100µF total output capacitance for portable RF applications. |
| Integrated thermal and current protection | Self-recovering shutdown prevents latch-up during transient overload or board-level thermal events. |
Applications
| Smartphone RF Power Amplifier | Tablet PC Cellular Modem |
|---|---|
Use Scenario: Supplying VCC to LTE Band 1/3/7/40 power amplifiers during transmit bursts and deep-sleep states. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing stable 3.3V rail with dynamic mode switching as battery voltage drops from 4.2V to 3.0V. Use Value: Maintains PA efficiency across full battery discharge curve while enabling ultra-low IQ during idle periods via bypass mode. | Use Scenario: Biasing multi-band 4G/LTE transceiver modules requiring consistent 3.3V under varying battery conditions. IC Role / Device Role / Timing Role: System-level power management IC delivering regulated output with automatic buck/boost handoff at VBAT ≈ VOUT. Use Value: Eliminates need for discrete LDO + buck + boost combo, reducing solution size by >40% and component count by 7 parts. |
| Wireless Baseband Processor Core | IoT Cellular Module Power Rail |
Use Scenario: Powering application processor I/O or memory interface rails where input voltage may dip below nominal output during peak current draw. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter supporting dynamic voltage scaling and fast load transient response. Use Value: Achieves >92% efficiency at 500mA load with 2.5MHz switching, minimizing thermal impact on adjacent RF sections. | Use Scenario: Providing main VDD to NB-IoT or LTE-M modules operating from single-cell Li-ion with aggressive duty cycling. IC Role / Device Role / Timing Role: Standalone power supply enabling both active transmission and 10µA sleep current targets. Use Value: 45µA quiescent current and bypass mode extend battery life beyond 10 years in metering applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91107IRZ-T | Higher 3A output capability, 3.2MHz switching, improved light-load efficiency (25µA IQ), same WLCSP-16 package. | Supports higher-current PAs (e.g., 5G sub-6GHz) and tighter transient response requirements. | Preferred for new designs requiring extended lifetime support and higher performance headroom. |
| TPS63020DSJR | 2.5V–5.5V input, 3.3V fixed output, 3A max, 2.4MHz, 25µA IQ, 12-pin WSON package. | Larger footprint (3mm × 2mm), different pinout, no dedicated bypass mode-uses power-save mode instead. | Suitable when WLCSP assembly is unavailable or thermal pad rework is constrained. |
Compared with ISL91106IIAZ-T, ISL91107IRZ-T offers higher current and lower IQ in identical packaging, while TPS63020DSJR trades package size and bypass functionality for broader vendor availability and simplified thermal design.
Availability
ISL91106IIAZ-T is available at Aetrix Electronics and suitable for smartphone RF power amplifiers, tablet cellular modems, and wireless baseband processors requiring stable component supply with long-term lifecycle assurance.
Supply support for ISL91106IIAZ-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
Renesas Electronics Corporation acquired Intersil in 2017 and maintains its analog and power management portfolio with ISO 9001-certified manufacturing and global distribution.
The ISL91106 product line targets space-constrained, battery-powered RF systems requiring seamless voltage regulation across wide input ranges-especially in cellular infrastructure and mobile terminal applications.
FAQ
What output voltage does the ISL91106IIAZ-T provide?
The ISL91106IIAZ-T provides a fixed 3.3V output voltage, as indicated by the "IIAZ" suffix in its part number. This eliminates the need for external feedback resistors and simplifies design for applications requiring a stable 3.3V rail, such as RF power amplifier biasing. The ISL91106IIAZ-T achieves this using internal resistor division and is validated for ±1% output accuracy over temperature and load.
Does the ISL91106IIAZ-T support automatic mode transition between buck and boost?
Yes, the ISL91106IIAZ-T automatically and seamlessly transitions between buck and boost operating modes without output voltage disturbance or external control. This behavior is intrinsic to its 4-switch synchronous architecture and internal state machine, enabling stable regulation as input voltage crosses the 3.3V output threshold-critical for maintaining PA performance during battery discharge in smartphones.
How is bypass mode enabled on the ISL91106IIAZ-T?
Bypass mode on the ISL91106IIAZ-T is enabled by setting MODE1 = LOW and MODE2 = LOW. In this state, internal FETs create a low-resistance conduction path from PVIN to VOUT, disabling switching operation and reducing quiescent current to approximately 1µA. This mode is ideal for system sleep states and is distinct from standard power-save modes found in other regulators.
What package type and dimensions does the ISL91106IIAZ-T use?
The ISL91106IIAZ-T uses a 2.15mm × 1.51mm, 16-bump Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch and an exposed thermal pad on the bottom. This ultra-compact package supports high-density portable designs and requires microvia-in-pad or solder-mask-defined pad layout for reliable assembly-verified in the ISL91106IIAZ-T evaluation board layout (ISL91106IIx-EVZ).
Is the ISL91106IIAZ-T still recommended for new designs?
No-the ISL91106IIAZ-T is marked "NOT RECOMMENDED FOR NEW DESIGNS" in the official datasheet (FN8679 Rev 2.00), with ISL91107IRZ-T cited as the recommended replacement. While ISL91106IIAZ-T remains available for legacy support and existing production, new designs should evaluate ISL91107IRZ-T for improved specs including 3A output, 25µA IQ, and enhanced thermal performance-all in the same WLCSP-16 footprint.
ISL91106IIAZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 15-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V (3.3V, 3.4V)
- Voltage - Output (Max):
- 5.2V
- Current - Output:
- 2A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-WLCSP (1.51x2.15)
ISL91106IIAZ-T FAQ
1.How can I place an order for ISL91106IIAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91106IIAZ-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 ISL91106IIAZ-T reliable?
The price and inventory of ISL91106IIAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91106IIAZ-T is usually 5 days.
3.What payment methods are accepted for ISL91106IIAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91106IIAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91106IIAZ-T?
ISL91106IIAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91106IIAZ-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 ISL91106IIAZ-T?
For technical support, including ISL91106IIAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91106IIAZ-T requirements.
6.How does Aetrix verify that ISL91106IIAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91106IIAZ-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 ISL91106IIAZ-T meets industry standards.
7.What is the process for return or replacement of ISL91106IIAZ-T?
All ISL91106IIAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91106IIAZ-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 ISL91106IIAZ-T part is unused and in its original packaging.
Return procedure for ISL91106IIAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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