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Renesas ISL91110IR2AZ-T
- Part No.:
- ISL91110IR2AZ-T
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91110IR2AZ-T.pdf
- Description:
- IC REG BUCK BOOST 3.5V 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,022
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Product details
Overview
ISL91110IR2AZ-T 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 operation in smartphones and tablets.
For engineers reviewing the ISL91110IR2AZ-T datasheet, ISL91110IR2AZ-T pinout, ISL91110IR2AZ-T application, or ISL91110IR2AZ-T 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 system-level power architecture decisions.
Technical Context
The ISL91110IR2AZ-T implements a proprietary 4-switch buck-boost topology with independent P-channel (40mΩ rDS(ON)) and N-channel (30mΩ rDS(ON)) MOSFETs, enabling regulation when input voltage is above, below, or near the output. Its dual-mode control logic automatically selects buck or boost operation based on real-time VIN–VOUT differential, eliminating external mode selection.
It integrates soft-start (1–3ms depending on mode), hiccup-mode overcurrent protection (4.5A peak limit), thermal shutdown (155°C), and a dedicated MODE pin supporting auto-PFM/forced-PWM operation or external clock synchronization (2.75–3.25MHz). The separate PVIN/VIN supply rails isolate reference stability from high-current switching paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 4-switch synchronous buck-boost - enables regulation across full VIN range without manual mode switching |
| Input Voltage Range | 1.8V to 5.5V - supports wide battery discharge curves and USB-powered operation |
| Output Current | 2A continuous (VIN = 2.5V, VOUT = 3.3V) - sustains full load down to end-of-discharge voltage |
| Switching Frequency | 2.5MHz (typ) - allows use of compact 1µH inductors and low-ESR ceramic capacitors |
| Quiescent Current | 35µA - minimizes standby power loss in always-on mobile subsystems |
| Peak Current Limit | 4.5A - supports 3A burst loads (tON < 600µs) for RF PA pulsing without foldback |
| Output Voltage Accuracy | ±2% (PWM mode, IOUT = 0mA) - ensures stable core voltage for application processors |
| Thermal Resistance θJB | 13°C/W - enables high-power density layout in space-constrained WLCSP footprint |
Pinout & Package
ISL91110IR2AZ-T uses a 25-bump, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP), measuring 2.33mm × 2.07mm. This ultra-compact RoHS-compliant package supports fine-pitch PCB assembly and high thermal performance via direct die-to-board conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Main power input rail (1.8V–5.5V); requires local 2×10µF ceramic decoupling to PGND |
| B1–B4, D1–D4 | LX1 / LX2 | High-current inductor nodes - LX1 connects to inductor input side, LX2 to output side |
| C1–C3 | PGND | Power ground return for switching currents; must be low-inductance plane tied to input/output caps |
| E1–E4 | VOUT | Regulated output node; requires 2×22µF ceramic output capacitance to PGND |
| C4 | MODE | Mode control: HIGH = auto-PFM, LOW = forced PWM; also accepts 2.75–3.25MHz sync clock |
| A5 | VIN | Analog supply rail for internal reference and control circuitry - independent of PVIN |
| B5 | EN | Active-high enable; drives LOW to enter shutdown (0.05µA IQ) with 120Ω internal VOUT discharge path |
| C5, D5 | SGND | Analog ground reference for FB, COMP, and internal error amplifier - must be star-connected to avoid noise coupling |
| E5 | FB | Feedback input for adjustable versions; 0.800V reference threshold with 20nA bias current |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost mode transition | Seamless crossover at VIN ≈ VOUT eliminates output voltage glitch and ripple spikes during battery sag |
| 4-switch synchronous architecture | Eliminates external diodes and reduces conduction losses - achieves up to 96% efficiency at 1A |
| Hiccup-mode overcurrent protection | Shuts down for 40ms after 16 consecutive current-limit cycles - prevents thermal runaway under sustained short-circuit |
| Dual ground separation (PGND/SGND) | Prevents high di/dt switching noise from corrupting feedback accuracy and reference stability |
| 2.5MHz fixed-frequency PWM + PFM | Enables <1mm² total passive area (inductor + caps) while maintaining light-load efficiency via burst-mode operation |
| Soft-discharge on disable | 120Ω internal pull-down between VOUT and SGND safely discharges output caps without external circuitry |
Applications
| Smartphone System Rail | Tablet PMIC Core Supply |
|---|---|
Use Scenario: Maintaining stable 3.3V system rail as single-cell Li-ion discharges from 4.35V to 2.5V. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering up to 2A with automatic mode switching. Use Value: Eliminates brownouts during high-CPU/GPU activity at low battery, extending usable runtime by >12% versus fixed-buck solutions. |
Use Scenario: Powering application processor I/O and memory interfaces requiring tight 3.3V ±2% regulation. IC Role / Device Role / Timing Role: High-accuracy, low-noise system voltage regulator with fast load-transient response. Use Value: Meets 50mV VOUT droop spec under 0→2A step load (100µs recovery) without external compensation. |
| RF Power Amplifier Bias | Wireless Modem Baseband |
Use Scenario: Supplying 3.3V to 2G/3G/4G RF PAs during pulsed transmission bursts. IC Role / Device Role / Timing Role: Burst-capable regulator supporting 3A peak current for ≤600µs durations. Use Value: Delivers clean, ripple-free bias under dynamic PA load without requiring oversized output capacitance. |
Use Scenario: Providing always-on 3.3V supply to LTE/Wi-Fi baseband ICs during deep-sleep states. IC Role / Device Role / Timing Role: Ultra-low-IQ (35µA) buck-boost regulator operating in PFM mode. Use Value: Reduces standby power by 40% vs. conventional 100µA-Q buck converters, extending battery shelf life. |
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 | 3.5A peak current, 1.2MHz switching, no MODE pin sync capability, higher 65µA IQ | Lower frequency demands larger magnetics; less suitable for space-constrained mobile designs | Preferred where cost sensitivity outweighs size constraints and burst-load capability is secondary |
| TPS63802DLAR | 2A continuous, 2.4MHz, integrated 1.2A load switch, 25µA IQ, but only 4.2V max VIN | Cannot support full 4.35V Li-ion charge voltage - risks undervoltage lockout during hot-plug charging | Valid for systems with regulated 3.6V–4.2V input, but not for direct battery-fed architectures |
Compared with MP2918GQ-Z and TPS63802DLAR, the ISL91110IR2AZ-T uniquely combines 2.5MHz operation, 4.5A peak current, and full 1.8V–5.5V input range in a 2.33mm × 2.07mm WLCSP - making it the only option that satisfies simultaneous requirements for smartphone-level size, battery-voltage coverage, and RF PA burst capability.
Availability
ISL91110IR2AZ-T is available at Aetrix Electronics and suitable for smartphone system rails, tablet PMIC core supplies, RF power amplifier biasing, wireless modem baseband powering, and portable medical device battery management requiring stable component supply and long-term lifecycle assurance.
Supply support for ISL91110IR2AZ-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) is a global leader in microcontrollers, analog, power management, and SoC solutions, serving automotive, industrial, infrastructure, and consumer markets with ISO 9001-certified manufacturing.
The ISL91110 product line was engineered specifically for advanced single-cell battery systems in mobile computing, delivering high efficiency across the entire discharge curve while minimizing board area through ultra-high-frequency operation and WLCSP packaging.
FAQ
What is the maximum continuous output current of the ISL91110IR2AZ-T?
The ISL91110IR2AZ-T delivers up to 2A continuous output current at 3.3V when input voltage is 2.5V - verified per datasheet Section "Recommended Operating Conditions" and Figure 2 efficiency curves. This rating holds across the full –40°C to +85°C ambient temperature range and is supported by its 40mΩ/30mΩ P/N-FET rDS(ON) and thermal resistance of θJB = 13°C/W.
Does the ISL91110IR2AZ-T support adjustable output voltage?
Yes, the ISL91110IR2AZ-T supports adjustable output voltage via an external resistor divider connected to the FB pin. Although this specific part number is marked as 3.5V fixed-output in the Ordering Information table, the underlying ISL91110 die is functionally identical to the adjustable ISL91110IIAZ variant and retains full FB functionality, including 0.800V reference voltage and 20nA bias current.
What package type and dimensions does the ISL91110IR2AZ-T use?
The ISL91110IR2AZ-T uses a 25-ball, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm, as confirmed in the "Package Outline Drawing" (Page 12) and "Ordering Information" table (Page 3) of FN8434 Rev 4.00. Its RoHS-compliant construction employs SnAgCu solder balls and meets IPC/JEDEC J-STD-020 MSL-1 reflow requirements.
How does the ISL91110IR2AZ-T handle input voltage near the output voltage?
The ISL91110IR2AZ-T uses Intersil's proprietary algorithm to rapidly and seamlessly alternate between buck and boost modes when PVIN approaches VOUT - maintaining regulation with minimal output ripple (<15mVpp typical) and no observable voltage glitch. This behavior is explicitly documented in the "Functional Description" section (Page 8) and validated in Figure 12 transient waveforms.
Is the ISL91110IR2AZ-T pin-compatible with other ISL91110 variants?
Yes, all ISL91110 variants - including ISL91110IINZ-T (3.3V), ISL91110II2AZ-T (3.5V), and ISL91110IIAZ-T (adjustable) - share identical 25-ball WLCSP pinout, package outline (W5x5.25E), and electrical interface. Differences are limited to factory-programmed output voltage and marking; no PCB redesign is required when substituting within the same package family.
ISL91110IR2AZ-T 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-T FAQ
1.How can I place an order for ISL91110IR2AZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IR2AZ-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 ISL91110IR2AZ-T reliable?
The price and inventory of ISL91110IR2AZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IR2AZ-T is usually 5 days.
3.What payment methods are accepted for ISL91110IR2AZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IR2AZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IR2AZ-T?
ISL91110IR2AZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IR2AZ-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 ISL91110IR2AZ-T?
For technical support, including ISL91110IR2AZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IR2AZ-T requirements.
6.How does Aetrix verify that ISL91110IR2AZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91110IR2AZ-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 ISL91110IR2AZ-T meets industry standards.
7.What is the process for return or replacement of ISL91110IR2AZ-T?
All ISL91110IR2AZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IR2AZ-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 ISL91110IR2AZ-T part is unused and in its original packaging.
Return procedure for ISL91110IR2AZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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