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Renesas ISL91110II2AZ-T
- Part No.:
- ISL91110II2AZ-T
- Manufacturer:
- Renesas
- Package:
- 25-UFBGA, WLCSP
- Datasheet:
-
ISL91110II2AZ-T.pdf
- Description:
- IC REG BUCK BST 3.5V 2A 25WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,615
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Product details
Overview
ISL91110II2AZ-T from Renesas Electronics (formerly Intersil) is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A continuous output at 3.5V across a 2.5V–4.35V Li-ion battery range. It features automatic buck/boost mode transition, 2.5MHz switching frequency, and 35µA quiescent current-enabling brownout-free system voltage in space-constrained mobile power rails.
For engineers reviewing the ISL91110II2AZ-T datasheet, ISL91110II2AZ-T pinout, ISL91110II2AZ-T application, or ISL91110II2AZ-T equivalent, key selection criteria include its fixed 3.5V output, WLCSP-25 package compatibility with ultra-thin PCBs, hiccup-mode overcurrent protection, and seamless operation near VIN ≈ VOUT for advanced single-cell battery systems.
Technical Context
The ISL91110II2AZ-T implements a proprietary 4-switch buck-boost topology with integrated low-RDS(ON) PFET (40mΩ) and NFET (30mΩ), enabling automatic, glitch-free transitions between buck and boost modes without external control. Its 2.5MHz oscillator minimizes inductor and capacitor size while maintaining regulation under dynamic load steps up to 2A.
It uses separate PVIN (power path) and VIN (bias supply) inputs, dual ground planes (PGND/SGND), and a MODE pin supporting auto-PFM or forced PWM operation. Thermal shutdown activates at +155°C with +30°C hysteresis, and hiccup-mode overcurrent protection triggers after 16 consecutive peak-current-limit cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.5V - eliminates external feedback resistors and simplifies layout for dedicated system rail use. |
| Continuous Output Current | 2A at VOUT = 3.5V, PVIN = 2.5V - sustains full load across depleted Li-ion battery discharge curve. |
| Switching Frequency | 2.5MHz (typ) - enables use of compact 1µH inductors and ceramic capacitors, reducing solution footprint by >40% vs 1MHz designs. |
| Quiescent Current | 35µA in PFM mode - extends battery runtime in standby or light-load states (e.g., modem sleep mode). |
| Input Voltage Range | 1.8V to 5.5V - supports wide battery chemistries (Li-ion, Li-poly, LiFePO₄) and USB-powered operation. |
| Peak Switch Current Limit | 4.5A - provides robust transient handling for RF PA burst loads without external current sensing. |
| Thermal Resistance θJB | 13°C/W - enables high-power density operation in thermally constrained smartphone/tablet PCBs. |
Pinout & Package
ISL91110II2AZ-T is housed in a 25-bump, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm, optimized for ultra-thin mobile applications with minimal board area and thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Primary power input (1.8V–5.5V); connects to 2×10µF input caps; shares internal FET source nodes. |
| B1–B4, D1–D4 | LX1 / LX2 | Inductor connection points: LX1 (input-side switch node), LX2 (output-side switch node); require low-inductance routing. |
| C1–C3 | PGND | Power ground for high di/dt switching currents; must be solid copper plane tied directly to input/output cap grounds. |
| E1–E4 | VOUT | Regulated 3.5V output; connects to 2×22µF output capacitors; fixed-output version ties FB internally to VOUT. |
| C4 | MODE | Selects auto-PFM (HIGH) or forced PWM (LOW); also accepts external sync clock (2.75–3.25MHz). |
| A5 | VIN | Bias supply input (1.8V–5.5V); powers internal reference and control circuitry independently of PVIN path. |
| B5 | EN | Active-HIGH enable; asserts soft-start sequence; pulls LOW to engage 120Ω internal VOUT discharge resistor. |
| C5, D5 | SGND | Analog ground for error amplifier and feedback; must be isolated from PGND except at single-point star ground. |
| E5 | FB | Feedback pin - internally shorted to VOUT in ISL91110II2AZ-T (fixed 3.5V), not used externally. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Zero-voltage-crossing detection ensures seamless, ripple-minimized switching when PVIN ≈ VOUT - critical for stable SoC core rail during battery sag. |
| 4-switch synchronous architecture | Integrated 40mΩ PFET / 30mΩ NFET switches eliminate external MOSFETs and gate drivers - reduces BOM count and layout complexity. |
| Hiccup-mode overcurrent protection | Shuts down for 40ms after 16 consecutive current-limit cycles - prevents thermal runaway during sustained short-circuit or overload conditions. |
| 2.5MHz constant-frequency PWM | Maintains tight regulation and predictable EMI spectrum even under heavy load - avoids audible noise and simplifies filtering. |
| Separate PVIN/VIN supplies | Decouples high-current power path from precision bias rail - improves reference stability and line regulation across wide input range. |
Applications
| Smartphone System Rail | Tablet PMIC Sub-Rail |
|---|---|
|
Use Scenario: Maintaining stable 3.5V system voltage as single-cell Li-ion discharges from 4.35V to 2.5V. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying application processor I/O or memory interface rail. Use Value: Eliminates brownouts during high-CPU-load battery sag, extending usable battery capacity by >15% versus fixed-buck solutions. |
Use Scenario: Powering LTE/5G RF power amplifiers requiring clean, ripple-free 3.5V under pulsed 3A burst loads. IC Role / Device Role / Timing Role: High-dynamic-response buck-boost converter synchronized to PA enable timing via MODE pin. Use Value: Delivers <15mV output ripple during 3A transients - meets stringent RF PA spectral mask requirements without added LC filtering. |
| Wireless Modem Baseband | Portable Medical Sensor Hub |
|
Use Scenario: Supplying baseband processor core voltage in always-on IoT modems with intermittent 2G/3G/4G transmission. IC Role / Device Role / Timing Role: Low-quiescent-current buck-boost regulator operating in auto-PFM mode during idle, PWM during transmit. Use Value: 35µA IQ extends battery life to >12 months on coin cell or small Li-ion - validated per EN 301 908-1 radiated emission limits. |
Use Scenario: Powering multi-sensor data acquisition subsystem (ECG, SpO₂, temperature) in handheld diagnostic devices. IC Role / Device Role / Timing Role: Single-rail buck-boost source with thermal shutdown and hiccup protection for patient-safe, fault-tolerant operation. Use Value: +155°C thermal shutdown and 120Ω soft-discharge prevent hazardous thermal buildup or residual voltage during device removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91110IINZ-T | Fixed 3.3V output; identical package, pinout, and electrical specs except VOUT. | Used where system requires 3.3V logic rail instead of 3.5V; no design change needed beyond output capacitor re-rating. | Select ISL91110IINZ-T if powering standard 3.3V I/O interfaces; otherwise retain ISL91110II2AZ-T for 3.5V-specific rails. |
| MP8845GQ-Z | 3A rated, 2.2MHz switching, but lacks hiccup-mode OCP and uses single GND; higher IQ (65µA). | Suitable for cost-sensitive industrial apps where thermal fault tolerance is secondary; requires layout revision for GND separation. | Choose MP8845GQ-Z only for non-critical 3A loads with relaxed thermal safety; ISL91110II2AZ-T remains preferred for medical/mobility. |
Compared with ISL91110IINZ-T, ISL91110II2AZ-T delivers +0.2V higher output for margin-sensitive analog rails; versus MP8845GQ-Z, it offers superior thermal fault containment and lower light-load IQ-critical for battery longevity in portable electronics.
Availability
ISL91110II2AZ-T is available at Aetrix Electronics and suitable for smartphone system rails, tablet PMIC sub-rails, and wireless modem baseband applications requiring stable component supply, long-lifecycle support, and RoHS-compliant WLCSP packaging.
Supply support for ISL91110II2AZ-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 is a global leader in microcontrollers, analog, power management, and SoC solutions, serving automotive, industrial, infrastructure, and consumer markets with high-reliability semiconductor products.
The ISL91110 product line was designed specifically for high-efficiency, space-constrained battery-powered systems requiring seamless buck-boost conversion-targeting next-generation smartphones, tablets, and portable medical devices.
FAQ
What is the output voltage of the ISL91110II2AZ-T?
The ISL91110II2AZ-T provides a factory-trimmed fixed output voltage of 3.5V ±2%, with no external feedback components required. This value is confirmed in the Ordering Information table (Page 3) and Analog Specifications section (Page 4) of the FN8434 Rev 4.00 datasheet. The FB pin is internally connected to VOUT, making the device a true drop-in solution for 3.5V system rails.
Does the ISL91110II2AZ-T support external synchronization?
Yes, the ISL91110II2AZ-T supports external clock synchronization via the MODE pin, which accepts an input clock signal from 2.75MHz to 3.25MHz. When driven with an external clock, the device synchronizes its internal 2.5MHz oscillator to minimize beat frequencies and EMI in multi-rail power systems. This capability is documented in the Pin Descriptions table (Page 3) and Functional Description section (Page 8).
What protection features does the ISL91110II2AZ-T include?
The ISL91110II2AZ-T integrates short-circuit protection, over-temperature shutdown (+155°C trip, +125°C recovery), undervoltage lockout (1.775V rising threshold), and hiccup-mode overcurrent protection. Hiccup mode disables switching for ~40ms after 16 consecutive current-limit cycles, then attempts soft-start-preventing thermal damage during sustained faults. These protections are detailed in the Absolute Maximum Ratings (Page 4), Functional Description (Page 8), and Applications Information (Page 9) sections.
Can the ISL91110II2AZ-T operate with input voltage below 2.5V?
Yes, the ISL91110II2AZ-T operates across a full 1.8V to 5.5V input range, as specified in the Recommended Operating Conditions (Page 4) and Absolute Maximum Ratings (Page 4). While continuous 2A output is guaranteed down to PVIN = 2.5V at VOUT = 3.5V, the device maintains regulation at lower inputs (e.g., 1.8V) at reduced load-enabling operation through deep battery discharge or backup-supply scenarios.
What is the thermal resistance of the ISL91110II2AZ-T package?
The ISL91110II2AZ-T in its 25-ball WLCSP package has a typical junction-to-board thermal resistance (θJB) of 13°C/W, as stated in the Thermal Information table (Page 4) and Table 1 (Page 3). This low value enables efficient heat transfer to the PCB, supporting 2A continuous operation in thermally constrained mobile PCB layouts without additional heatsinking.
ISL91110II2AZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 25-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 25-WLCSP (2.07x2.33)
ISL91110II2AZ-T FAQ
1.How can I place an order for ISL91110II2AZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110II2AZ-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 ISL91110II2AZ-T reliable?
The price and inventory of ISL91110II2AZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110II2AZ-T is usually 5 days.
3.What payment methods are accepted for ISL91110II2AZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110II2AZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110II2AZ-T?
ISL91110II2AZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110II2AZ-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 ISL91110II2AZ-T?
For technical support, including ISL91110II2AZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110II2AZ-T requirements.
6.How does Aetrix verify that ISL91110II2AZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91110II2AZ-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 ISL91110II2AZ-T meets industry standards.
7.What is the process for return or replacement of ISL91110II2AZ-T?
All ISL91110II2AZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110II2AZ-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 ISL91110II2AZ-T part is unused and in its original packaging.
Return procedure for ISL91110II2AZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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