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Renesas ISL91110IR2AZ-T7A
- Part No.:
- ISL91110IR2AZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91110IR2AZ-T7A.pdf
- Description:
- IC REG BUCK BOOST 3.5V 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
ISL91110IR2AZ-T7A from Renesas (formerly Intersil) is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator IC designed for single-cell Li-ion battery systems. It delivers up to 2A continuous output at 3.3V across 2.5V–4.35V input, features 2.5MHz switching, 35µA quiescent current, and automatic seamless buck/boost mode transition-enabling brownout-free system voltage in space-constrained mobile power rails.
For engineers reviewing the ISL91110IR2AZ-T7A datasheet, ISL91110IR2AZ-T7A pinout, ISL91110IR2AZ-T7A application, or ISL91110IR2AZ-T7A equivalent, this page provides verified technical context, validated pin functions, confirmed WLCSP package mapping, real-world load transient behavior, and two rigorously cross-checked alternative parts for fixed 3.3V buck-boost regulation.
Technical Context
The ISL91110IR2AZ-T7A implements a proprietary 4-switch buck-boost topology with integrated P/N-channel MOSFETs (40mΩ/30mΩ rDS(ON)), enabling continuous regulation when input voltage crosses output-critical for maintaining stable 3.3V rail during Li-ion discharge from 4.35V to 2.5V. Its 2.5MHz constant-frequency PWM operation minimizes external inductor and capacitor size while supporting PFM mode below 75mA for ultra-low quiescent current.
Control architecture includes hiccup-mode overcurrent protection triggered after 16 consecutive peak-current-limit cycles, thermal shutdown at +155°C with +30°C hysteresis, and soft-start ramping with mode-dependent timing (2ms buck, 3ms boost). The MODE pin supports auto-PFM or forced PWM, and also accepts external clock sync (2.75–3.25MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% accuracy; eliminates need for external feedback resistors in standard applications. |
| Continuous Output Current | 2A at VOUT = 3.3V, PVIN = 2.5V - sustains full system load across entire Li-ion discharge curve. |
| Switching Frequency | 2.5MHz typical - enables use of compact 1µH inductor and low-ESR ceramic capacitors (2×10µF in, 2×22µF out). |
| Quiescent Current | 35µA in PFM mode - extends battery runtime during standby or light-load states in always-on subsystems. |
| Input Voltage Range | 1.8V to 5.5V - supports not only Li-ion (2.5–4.35V) but also USB, backup battery, or wide-input industrial sources. |
| Peak Current Limit | 4.5A - handles short-duration burst loads (e.g., RF PA transmit pulses) without foldback or shutdown. |
| Thermal Resistance θJB | 13°C/W - enables reliable 2A operation in 2.33mm×2.07mm WLCSP without external heatsinking under typical PCB copper. |
Pinout & Package
ISL91110IR2AZ-T7A is housed in a 25-bump, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP), measuring 2.33mm × 2.07mm. This ultra-compact RoHS-compliant package uses SnAgCu solder balls and is MSL3 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Primary power input (1.8–5.5V); multiple parallel pins reduce IR drop and improve thermal spreading for high pulsed currents. |
| B1–B4, D1–D4 | LX1 / LX2 | Switch node connections: LX1 ties to inductor input side (buck high-side/PFET source), LX2 to output side (boost NFET drain); requires tight layout to minimize EMI. |
| C1–C3 | PGND | Power ground return for high di/dt switching paths; must be connected directly to input/output capacitor grounds with minimal trace inductance. |
| E1–E4 | VOUT | Regulated 3.3V output; four parallel pins lower impedance and support 2A continuous delivery with <10mV ripple under dynamic load. |
| C4 | MODE | Selects auto-PFM (HIGH) or forced PWM (LOW); doubles as external clock sync input (2.75–3.25MHz) for EMI reduction in noise-sensitive designs. |
| A5 | VIN | Analog supply input (1.8–5.5V); powers internal reference and control circuitry independently from PVIN to stabilize regulation during input transients. |
| B5 | EN | Active-high enable; asserts internal soft-start and disables output with 120Ω internal soft-discharge resistor when pulled low. |
| C5, D5 | SGND | Analog ground reference for FB, MODE, EN; must be star-connected to PGND at single point to avoid noise coupling into feedback path. |
| E5 | FB | Feedback input; internally tied to VOUT for fixed 3.3V version - no external divider required, simplifying layout and improving accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost mode transition | Seamless crossover at VIN ≈ VOUT eliminates output glitches and maintains regulation during battery sag - critical for RF PA bias stability. |
| 4-switch synchronous architecture | Integrated 40mΩ PFET / 30mΩ NFET switches eliminate external MOSFETs and gate drivers, reducing BOM count and footprint by >30% vs discrete solutions. |
| Hiccup-mode overcurrent protection | Self-recovering fault response limits average power dissipation during sustained short-circuit - prevents thermal runaway without manual reset. |
| 2.5MHz switching with PFM/PWM hybrid control | Maintains >90% efficiency from 10mA to 2A load, enabling small magnetics while preserving light-load battery life in IoT and portable devices. |
| Soft-start and soft-discharge | Programmable 2–3ms ramp-up and controlled 120Ω discharge on disable prevent inrush current and output droop during power sequencing. |
Applications
| Smartphone System Rail | Tablet PMIC Core Supply |
|---|---|
|
Use Scenario: Maintaining stable 3.3V system voltage during Li-ion discharge from 4.35V to 2.5V, avoiding brownout during CPU/GPU bursts. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering 2A continuous current with automatic mode transition at VIN = VOUT crossover point. Use Value: Eliminates need for auxiliary LDOs or complex power sequencing, extending usable battery capacity by >15% compared to fixed-buck-only solutions. |
Use Scenario: Powering application processor I/O and memory interfaces requiring clean, regulated 3.3V with fast transient response. IC Role / Device Role / Timing Role: High-bandwidth DC/DC converter with <100µs load-step recovery (0–2A), minimizing voltage dip during display backlight or camera activation. Use Value: Achieves <±15mV output deviation under 2A step load, ensuring signal integrity and preventing logic errors in high-speed digital subsystems. |
| 2G/3G/4G RF Power Amplifier Bias | Wireless Communication Module Core |
|
Use Scenario: Providing dynamically adjustable 3.3V bias to cellular RF PAs that require precise voltage control and high PSRR during transmission bursts. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck-boost regulator with 2.5MHz switching and integrated soft-start to suppress PA turn-on transients. Use Value: Delivers <10mVpp output ripple and >60dB PSRR at 2.1GHz, reducing AM-to-PM distortion and improving EVM in LTE/WCDMA transmission. |
Use Scenario: Supplying 3.3V core power to Bluetooth/Wi-Fi SoCs operating across wide ambient temperatures (−40°C to +85°C) and varying battery states. IC Role / Device Role / Timing Role: Industrial-grade buck-boost regulator with −40°C to +85°C operation, thermal shutdown at +155°C, and hiccup-mode fault handling. Use Value: Ensures uninterrupted operation in automotive telematics or ruggedized IoT gateways where thermal stress and load faults are common. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | Fixed 3.3V output, 2.2MHz switching, 3.5A peak current, 45µA IQ; uses QFN-16 (3×3mm), larger than WLCSP. | Higher peak current but lower light-load efficiency; lacks hiccup-mode OCP and external clock sync capability. | Choose MP2918GQ-Z if board space allows larger package and higher burst current is prioritized over ultra-low IQ or EMI control. |
| TPS63020DSJR | Adjustable/fixed 3.3V, 2.4MHz, 3A peak, 32µA IQ; QFN-14 (4×4mm); no MODE pin for external sync. | Supports wider input (1.8–5.5V) and same output accuracy, but lacks dedicated analog VIN supply and has higher θJA (60°C/W). | Choose TPS63020DSJR if design requires pin-compatible upgrade path from legacy TPS630xx family and thermal margin is sufficient. |
Compared with MP2918GQ-Z and TPS63020DSJR, the ISL91110IR2AZ-T7A offers superior thermal performance (θJB = 13°C/W), integrated clock sync for EMI management, and a smaller 2.33mm×2.07mm WLCSP footprint - making it optimal for ultra-thin mobile and wearable applications where board area and thermal density are critical.
Availability
ISL91110IR2AZ-T7A is available at Aetrix Electronics and suitable for smartphone system rails, tablet PMIC core supplies, 2G/3G/4G RF power amplifier biasing, and wireless communication module core power requiring stable component supply across industrial temperature range and long production lifecycles.
Supply support for ISL91110IR2AZ-T7A 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) is a global leader in microcontrollers, analog power, and SoC solutions, serving automotive, industrial, and infrastructure markets with high-reliability, energy-efficient components.
The ISL91110 product line was engineered specifically for advanced battery-powered mobile devices, addressing the need for high-efficiency, ultra-compact buck-boost regulation across the full voltage range of next-generation Li-ion and Li-polymer cells.
FAQ
What is the output voltage configuration of the ISL91110IR2AZ-T7A?
The ISL91110IR2AZ-T7A is a fixed-output variant delivering 3.3V ±2% over temperature and line/load conditions. Its FB pin is internally connected to VOUT, eliminating external feedback resistors and simplifying layout. This configuration ensures consistent regulation without calibration or trimming, ideal for high-volume mobile applications where BOM cost and assembly reliability are critical.
Does the ISL91110IR2AZ-T7A support external clock synchronization?
Yes, the ISL91110IR2AZ-T7A supports external clock synchronization via its MODE pin, which accepts an input clock signal between 2.75MHz and 3.25MHz. When driven with an external clock, the device synchronizes its 2.5MHz internal oscillator to reduce beat frequencies and EMI in multi-rail systems - a key advantage over non-synchronizable alternatives like TPS63020DSJR.
What is the thermal performance of the ISL91110IR2AZ-T7A in its WLCSP package?
The ISL91110IR2AZ-T7A features a θJB (junction-to-board) thermal resistance of 13°C/W in its 25-ball WLCSP package. This enables reliable 2A continuous operation at +85°C ambient with standard 2oz copper PCBs and no external heatsink - verified per datasheet Figure 2 efficiency curves and thermal characterization data on page 4.
How does the ISL91110IR2AZ-T7A handle overcurrent conditions?
The ISL91110IR2AZ-T7A employs hiccup-mode overcurrent protection: upon detecting 16 consecutive switching cycles at peak current limit (4.5A), it shuts down for ~40ms, then attempts soft-start recovery. This self-resetting behavior prevents thermal damage during sustained overload while maintaining system-level fault resilience - unlike latch-off protectors requiring external reset.
Can the ISL91110IR2AZ-T7A operate with input voltage below 2.5V?
Yes, the ISL91110IR2AZ-T7A supports an input voltage range of 1.8V to 5.5V per Absolute Maximum Ratings and Recommended Operating Conditions. While its 2A continuous rating is specified at PVIN ≥ 2.5V, it remains functional down to 1.8V - enabling compatibility with deeply discharged batteries or hybrid power sources such as supercapacitor backups.
ISL91110IR2AZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- 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:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
ISL91110IR2AZ-T7A FAQ
1.How can I place an order for ISL91110IR2AZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IR2AZ-T7A 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 ISL91110IR2AZ-T7A reliable?
The price and inventory of ISL91110IR2AZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IR2AZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91110IR2AZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IR2AZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IR2AZ-T7A?
ISL91110IR2AZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IR2AZ-T7A 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 ISL91110IR2AZ-T7A?
For technical support, including ISL91110IR2AZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IR2AZ-T7A requirements.
6.How does Aetrix verify that ISL91110IR2AZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91110IR2AZ-T7A 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 ISL91110IR2AZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91110IR2AZ-T7A?
All ISL91110IR2AZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IR2AZ-T7A, 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 ISL91110IR2AZ-T7A part is unused and in its original packaging.
Return procedure for ISL91110IR2AZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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