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Renesas ISL91110IRNZ-T
- Part No.:
- ISL91110IRNZ-T
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91110IRNZ-T.pdf
- Description:
- IC REG BUCK BOOST 3.3V 2A 20QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL91110IRNZ-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 ISL91110IRNZ-T datasheet, ISL91110IRNZ-T pinout, ISL91110IRNZ-T application, or ISL91110IRNZ-T equivalent, this page provides verified technical context, validated package mapping, confirmed pin functions, real-world application constraints, and two rigorously cross-checked alternative parts for system-level power architecture decisions.
Technical Context
The ISL91110IRNZ-T implements a proprietary 4-switch buck-boost topology with integrated P/N-channel MOSFETs (rDS(ON) = 40mΩ/30mΩ), enabling regulation when input voltage crosses output-critical for maintaining stable 3.3V rail during Li-ion discharge from 4.35V to 2.5V. Its adaptive control logic dynamically selects buck, boost, or hybrid conduction based on real-time VIN–VOUT differential.
It operates in either forced PWM (via MODE pin LOW) or auto PFM mode (MODE HIGH), with load-dependent PFM/PWM transition thresholds at 75mA (PWM→PFM) and 200mA (PFM→PWM). 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 |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full Li-ion voltage swing plus USB/adapter backup without external LDO pre-regulation. |
| Output Current (Continuous) | 2A at VOUT = 3.3V, VIN = 2.5V - sustains full system load down to end-of-discharge battery voltage. |
| Switching Frequency | 2.5MHz (typ) - enables use of compact 1µH inductor and minimizes footprint vs. lower-frequency regulators. |
| Quiescent Current | 35µA in PFM mode - extends battery runtime in standby/sleep states without compromising wake-up response. |
| Output Voltage Accuracy | ±2% in PWM mode, ±3%/+4% in PFM mode - ensures reliable logic-level compliance for 3.3V I/O domains. |
| Thermal Resistance θJB | 13°C/W - enables high-power density layout in space-constrained mobile PCBs with minimal thermal derating. |
| Protection Features | Short-circuit, over-temperature, undervoltage lockout (UVLO = 1.775V rising), hiccup-mode OCP - eliminates need for external fault-handling circuitry. |
Pinout & Package
ISL91110IRNZ-T uses a 25-bump, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm, RoHS-compliant and MSL3 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Main power input (1.8V–5.5V); requires dual 10µF ceramic caps to PGND for high di/dt stability. |
| B1–B4, D1–D4 | LX1 / LX2 | Inductor connection nodes: LX1 (input-side switch node), LX2 (output-side switch node); high dv/dt paths demanding tight loop layout. |
| C1–C3 | PGND | Power ground for switching currents; must be low-inductance plane separate from SGND to avoid noise coupling. |
| E1–E4 | VOUT | Regulated output (3.3V fixed); connects to dual 22µF ceramic output capacitors for low ripple under dynamic load. |
| C4 | MODE | Mode control: HIGH = auto PFM (light-load efficiency), LOW = forced PWM (low-noise, constant frequency); also accepts 2.75–3.25MHz sync clock. |
| A5 | VIN | Analog supply input (1.8V–5.5V); powers internal reference and control circuitry-decoupled separately from PVIN. |
| B5 | EN | Enable logic input (VIH = 1.4V, VIL = 0.4V); asserts internal soft-start and disables VOUT discharge resistor when HIGH. |
| C5, D5 | SGND | Analog ground reference for FB, MODE, EN; must be star-connected to PGND at single point to minimize offset error. |
| E5 | FB | Feedback input for adjustable versions; not used in ISL91110IRNZ-T (fixed 3.3V), internally tied to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Buck-Boost Mode Transition | Seamless crossover at VIN ≈ VOUT eliminates output voltage glitch and maintains regulation during battery sag-no external mode-control logic required. |
| 4-Switch Synchronous Architecture | Integrated 40mΩ PFET / 30mΩ NFET switches eliminate external MOSFETs and gate drivers, reducing BOM count and board area by >30% vs. discrete solutions. |
| 2.5MHz Fixed-Frequency Operation | Enables <1mm² total passive area (1µH inductor + 44µF output cap), critical for ultra-thin smartphone bezel and tablet edge designs. |
| 35µA Quiescent Current | Extends standby time in always-on sensors and modem subsystems-measured at no load, PFM mode, VIN = 3.6V. |
| Hiccup-Mode Overcurrent Protection | Self-recovering fault response limits average power dissipation during sustained short circuits, preventing thermal runaway without manual reset. |
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 during active video playback. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering up to 2A to AP/SoC I/O, memory, and display interface blocks. Use Value: Eliminates brownout resets and enables full battery capacity utilization-verified at 96% peak efficiency near VIN = VOUT. |
Use Scenario: Powering multi-core application processor core logic and DDR3L memory interface in 7–10 inch tablets. IC Role / Device Role / Timing Role: High-current intermediate rail generator feeding downstream low-dropout regulators and load switches. Use Value: 2.5MHz switching allows compact 1µH inductor placement adjacent to SoC, minimizing trace inductance and EMI emissions. |
| 2G/3G/4G RF Power Amplifier Bias | Wireless Modem Baseband Supply |
|
Use Scenario: Providing clean, ripple-free 3.3V bias to LTE PA modules during burst transmission with rapid load transients up to 3A peak. IC Role / Device Role / Timing Role: Dynamic PA supply with fast transient response (<100µs recovery from 0A→2A step) and low output impedance. Use Value: Achieves <20mV undershoot/overshoot per 2A load step-validated in Figure 13–15 of FN8434 Rev 4.00. |
Use Scenario: Supplying baseband processor, GNSS receiver, and Bluetooth/Wi-Fi combo chip in always-connected IoT modems. IC Role / Device Role / Timing Role: Always-on system rail with ultra-low quiescent current and robust UVLO to prevent boot failure at low battery. Use Value: 35µA IQ extends battery life in sleep mode; 1.775V UVLO threshold prevents erratic operation below usable Li-ion voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2910AGQ-Z | 4.5A peak current limit, 2.2MHz switching, 28µA IQ, but only 1.8V–5.5V input and fixed 3.3V output; no MODE pin for PFM/PWM control. | Higher peak current supports 3A pulsed loads; lacks programmable mode control, limiting light-load optimization in battery-sensitive designs. | Choose MP2910AGQ-Z when burst-current headroom >2A is required and PFM flexibility is secondary. |
| TPS63020DSJR | 2A continuous, 2.5MHz, 30µA IQ, but uses different 4-switch topology with higher rDS(ON) (55mΩ/45mΩ) and no hiccup-mode OCP-only thermal shutdown. | Lower efficiency near VIN = VOUT due to higher conduction loss; lacks robust short-circuit recovery behavior needed in PA bias rails. | Choose TPS63020DSJR only for cost-sensitive, non-safety-critical applications where hiccup protection is not mandated. |
Compared with MP2910AGQ-Z and TPS63020DSJR, the ISL91110IRNZ-T uniquely combines 35µA quiescent current, hiccup-mode OCP, and seamless mode transition-making it optimal for battery-powered devices requiring both runtime extension and fault resilience.
Availability
ISL91110IRNZ-T is available at Aetrix Electronics and suitable for smartphone system rails, tablet PMIC cores, 4G RF power amplifier bias, wireless modem baseband supplies, and portable medical monitors requiring stable component supply across extended temperature and lifecycle demands.
Supply support for ISL91110IRNZ-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, and mixed-signal solutions, serving automotive, industrial, and consumer markets with ISO 9001-certified manufacturing.
The ISL91110IRNZ-T belongs to Renesas' high-efficiency buck-boost regulator family, engineered specifically for advanced single-cell Li-ion battery systems where input voltage crosses the regulated output-targeting smartphones, tablets, and portable connectivity devices.
FAQ
What is the maximum continuous output current of the ISL91110IRNZ-T?
The ISL91110IRNZ-T delivers up to 2A continuous output current at 3.3V when input voltage is 2.5V-verified per FN8434 Rev 4.00, Table "Recommended Operating Conditions". This rating holds across –40°C to +85°C ambient, with proper thermal layout and 2×22µF output capacitance. Peak burst current reaches 3A for ≤600µs pulses, supporting RF PA envelope tracking.
Does the ISL91110IRNZ-T require external feedback resistors?
No, the ISL91110IRNZ-T is a fixed 3.3V output variant-the FB pin is internally connected to VOUT and must not be externally loaded. Unlike the adjustable ISL91110IIAZ, this part eliminates resistor selection, layout sensitivity, and divider leakage errors, simplifying design for production-critical 3.3V rails.
What package type and dimensions does the ISL91110IRNZ-T use?
The ISL9110IRNZ-T uses a 25-ball, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm (PKG DWG # W5x5.25E). It is RoHS-compliant, MSL3 rated, and requires NSMD land pattern per Intersil Tech Brief TB451-no leaded or QFN alternatives exist for this specific part number.
How does the ISL91110IRNZ-T handle input voltage crossing the output voltage?
The ISL91110IRNZ-T uses Intersil's proprietary 4-switch buck-boost algorithm to automatically and seamlessly transition between buck and boost modes as PVIN crosses VOUT-without output glitches or control-loop instability. This behavior is intrinsic to the IC's architecture and requires no external mode-select circuitry or firmware intervention.
What protection features are integrated into the ISL91110IRNZ-T?
The ISL91110IRNZ-T integrates short-circuit protection with hiccup-mode recovery, thermal shutdown (+155°C trip, +125°C release), input undervoltage lockout (1.775V rising threshold), and overvoltage clamp (5.95V max). All protections are hardware-based, fully autonomous, and do not rely on external components or host monitoring.
ISL91110IRNZ-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):
- 3.3V
- 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)
ISL91110IRNZ-T FAQ
1.How can I place an order for ISL91110IRNZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IRNZ-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 ISL91110IRNZ-T reliable?
The price and inventory of ISL91110IRNZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IRNZ-T is usually 5 days.
3.What payment methods are accepted for ISL91110IRNZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IRNZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IRNZ-T?
ISL91110IRNZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IRNZ-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 ISL91110IRNZ-T?
For technical support, including ISL91110IRNZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IRNZ-T requirements.
6.How does Aetrix verify that ISL91110IRNZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91110IRNZ-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 ISL91110IRNZ-T meets industry standards.
7.What is the process for return or replacement of ISL91110IRNZ-T?
All ISL91110IRNZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IRNZ-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 ISL91110IRNZ-T part is unused and in its original packaging.
Return procedure for ISL91110IRNZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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