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Renesas ISL91110IRNZ-T7A
- Part No.:
- ISL91110IRNZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91110IRNZ-T7A.pdf
- Description:
- IC REG BUCK BOOST 3.3V 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,324
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Product details
Overview
ISL91110IRNZ-T7A from Renesas (formerly Intersil) is a fully synchronous 4-switch buck-boost DC/DC regulator IC designed for single-cell Li-ion battery systems with input voltage near output voltage. It delivers up to 2A continuous output at 3.3V across 2.5V–4.35V battery range, features 2.5MHz switching frequency, 35µA quiescent current, and automatic seamless buck/boost mode transition.
For engineers reviewing the ISL91110IRNZ-T7A datasheet, ISL91110IRNZ-T7A pinout, ISL91110IRNZ-T7A application, or ISL91110IRNZ-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 brownout-free power in portable RF and mobile SoC designs.
Technical Context
The ISL91110IRNZ-T7A implements a proprietary 4-switch buck-boost topology with integrated high-side and low-side P/N-MOSFETs (rDS(ON) = 40mΩ/30mΩ), enabling regulation when PVIN is above, below, or equal to VOUT. Its control architecture combines PWM and PFM modes, with automatic mode transition triggered by load current thresholds (75mA PWM→PFM, 200mA PFM→PWM).
It uses separate PVIN (power path) and VIN (bias supply) inputs, dual ground pins (PGND for high-current switching, SGND for analog reference), and supports external synchronization via MODE pin (2.75–3.25MHz). Thermal shutdown activates at +155°C with +30°C hysteresis, and hiccup-mode overcurrent protection responds to 16 consecutive peak-current-limit cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 4-switch synchronous buck-boost with automatic mode transition |
| Input Voltage Range | 1.8V to 5.5V - supports full Li-ion discharge curve including sub-3V brownout regions |
| Output Voltage | Fixed 3.3V - eliminates external feedback divider, reduces BOM count and layout sensitivity |
| Continuous Output Current | 2A at VOUT = 3.3V, PVIN = 2.5V - sustains system operation down to end-of-discharge battery voltage |
| Switching Frequency | 2.5MHz (typ) - enables use of compact 1µH inductor and small ceramic capacitors (2×10µF in, 2×22µF out) |
| Quiescent Current | 35µA in PFM mode - extends battery runtime during light-load standby without sacrificing regulation accuracy |
| Protection Features | Short-circuit, over-temperature (+155°C), undervoltage lockout (1.775V rising), and hiccup-mode current limiting |
Pinout & Package
ISL91110IRNZ-T7A is housed in a 25-bump, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm, RoHS-compliant with SnAgCu solder balls and MSL3 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (A1–A4, B1–B4) | Power input rail | High-current input path for DC/DC conversion; requires 2×10µF ceramic caps to PGND |
| LX1 (B1–B4) | Inductor connection (input side) | Switch node for high-side PFET and low-side NFET in buck configuration; carries pulsed high di/dt |
| PGND (C1–C3) | Power ground | Low-impedance return path for switching currents; must be connected directly to input/output cap grounds |
| LX2 (D1–D4) | Inductor connection (output side) | Switch node for low-side PFET and high-side NFET in boost configuration; critical for EMI control |
| VOUT (E1–E4) | Regulated output | Delivers stable 3.3V; requires 2×22µF ceramic caps to PGND; supports up to 3A burst current |
| MODE (C4) | Operating mode control | Logic input: HIGH = auto PFM/PWM, LOW = forced PWM; also accepts external sync clock (2.75–3.25MHz) |
| VIN (A5) | Bias supply input | Provides stable operating voltage for internal references and control circuitry; independent of PVIN path |
| EN (B5) | Enable control | Active-HIGH logic input; asserts soft-start sequence on rising edge; pulls VOUT to GND via 120Ω resistor when LOW |
| SGND (C5, D5) | Analog ground | Reference ground for FB, error amplifier, and internal VREF; must be isolated from PGND except at single point |
| FB (E5) | Feedback input | Internally shorted to VOUT for fixed 3.3V operation; not used externally in ISL91110IRNZ-T7A configuration |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost mode transition | Seamless regulation with no output glitch when PVIN crosses VOUT - essential for uninterrupted smartphone baseband operation |
| 2.5MHz constant-frequency PWM | Enables <1mm² total passive footprint (1µH inductor + 4×ceramic caps) - critical for ultra-thin mobile PCBs |
| 35µA quiescent current | Extends standby time in always-on sensors and LTE modem sleep states without compromising startup speed |
| Dual ground separation (PGND/SGND) | Prevents switching noise coupling into feedback path - maintains ±2% output accuracy across -40°C to +85°C |
| Hiccup-mode overcurrent protection | Shuts down for 40ms after 16 consecutive current-limit cycles - protects MOSFETs during sustained short-circuit events |
Applications
| Smartphone Baseband Power | Tablet PMIC Core Rail |
|---|---|
Use Scenario: Powering application processor I/O and memory interfaces during deep discharge (PVIN = 2.5V–3.0V) while maintaining 3.3V VIO. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 3.3V from declining single-cell Li-ion battery. Use Value: Prevents brownout resets by sustaining regulation down to 2.5V input - maximizes usable battery capacity by >12%. |
Use Scenario: Supplying USB PHY, display interface, and audio codec rails in tablets where input voltage fluctuates between 3.0V and 4.2V. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter supporting dynamic voltage scaling across multiple subsystems. Use Value: Achieves >94% efficiency at 1A load across full input range - reduces thermal load on dense tablet PCBs. |
| 4G LTE Power Amplifier Bias | Wireless Modem RF Front-End |
Use Scenario: Providing clean, ripple-free 3.3V bias to PA driver stages in 4G handsets operating under pulsed RF load (0–3A bursts). IC Role / Device Role / Timing Role: Low-noise, fast-transient buck-boost regulator with <50mV output deviation during 0→2A load steps. Use Value: Maintains PA linearity and ACLR performance by limiting output voltage droop to ≤35mV at 2A/µs slew rate. |
Use Scenario: Powering RF transceiver LNA, mixer, and synthesizer blocks in Bluetooth/Wi-Fi combo modules with tight EMI constraints. IC Role / Device Role / Timing Role: Compact, high-frequency DC/DC source minimizing conducted emissions through 2.5MHz fundamental and harmonics. Use Value: Enables use of ferrite-bead-filtered 2.5MHz outputs - passes CISPR-22 Class B without shielding cans. |
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 | 4-switch architecture, 2.2MHz fSW, 3.5A peak current, but higher 55µA IQ and no hiccup-mode protection | Requires larger inductor (1.5µH) and lacks thermal hysteresis - less robust in thermally constrained handheld enclosures | Preferred for cost-sensitive designs where 2.2MHz allows marginally smaller passives but thermal resilience is secondary |
| TPS63802DLVR | 4-switch buck-boost, 2.4MHz fSW, 2A continuous, 17µA IQ, but only 1.8–5.5V input and no external sync capability | Lacks MODE pin sync function - unsuitable for systems requiring EMI spread-spectrum coordination with baseband clocks | Best for space-constrained IoT nodes needing lowest IQ, where EMI coexistence is not a system-level requirement |
Compared with MP2918GQ-Z and TPS63802DLVR, the ISL91110IRNZ-T7A uniquely combines 2.5MHz operation, hiccup-mode protection, and external clock synchronization in a 2.33mm × 2.07mm WLCSP - making it the only option meeting simultaneous requirements for smartphone PA bias, EMI control, and thermal safety.
Availability
ISL91110IRNZ-T7A is available at Aetrix Electronics and suitable for smartphone baseband power, tablet core rails, 4G LTE power amplifier bias, and wireless modem RF front-end applications requiring stable component supply across extended product lifecycles.
Supply support for ISL91110IRNZ-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 mixed-signal solutions, serving automotive, industrial, and communications markets with ISO 9001-certified manufacturing.
The ISL91110 product line was engineered specifically for advanced single-cell Li-ion battery systems in mobile computing, delivering high efficiency and seamless voltage regulation when input approaches output - solving brownout challenges in smartphones and tablets.
FAQ
What is the maximum continuous output current of the ISL91110IRNZ-T7A at 3.3V output?
The ISL91110IRNZ-T7A delivers up to 2A continuous output current at VOUT = 3.3V when PVIN = 2.5V, as specified in the Recommended Operating Conditions table on page 4 of FN8434 Rev 4.00. This rating ensures reliable operation across the full Li-ion battery discharge range (2.5V–4.35V) without derating. The ISL91110IRNZ-T7A achieves this using its 40mΩ/30mΩ synchronous MOSFET pair and optimized thermal resistance (θJB = 13°C/W).
Does the ISL91110IRNZ-T7A require external feedback resistors to set the output voltage?
No, the ISL91110IRNZ-T7A is the fixed 3.3V output variant - its FB pin is internally connected to VOUT, eliminating the need for external resistors. This is confirmed in the Ordering Information table (page 3) and Applications Information section (page 9), which state that fixed-output versions connect VOUT directly to FB. Using external resistors with the ISL91110IRNZ-T7A would conflict with its internal programming and degrade regulation accuracy.
What package type and dimensions does the ISL91110IRNZ-T7A use?
The ISL91110IRNZ-T7A uses a 25-ball Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch, measuring 2.33mm × 2.07mm (page 12 Package Outline Drawing W5x5.25E). It features SnAgCu e1 solder balls, RoHS compliance, and Moisture Sensitivity Level 3 per J-STD-020. The package has non-solder-mask-defined (NSMD) pads and requires specific land pattern geometry detailed in the datasheet's bottom-view drawing.
How does the ISL91110IRNZ-T7A handle input voltage transitions near the 3.3V output level?
The ISL91110IRNZ-T7A uses Intersil's proprietary buck-boost algorithm to automatically and seamlessly transition between buck and boost modes when PVIN approaches VOUT, maintaining regulation with very low output ripple. As documented in the Functional Description (page 8), this behavior occurs without glitches or mode-hunting, enabling stable operation during battery voltage decay from 3.6V to 3.0V - a critical capability for brownout-free smartphone system voltage.
What protection features are integrated into the ISL91110IRNZ-T7A?
The ISL91110IRNZ-T7A integrates short-circuit protection via hiccup-mode current limiting (triggered after 16 consecutive peak-current cycles), thermal shutdown at +155°C with +30°C hysteresis, undervoltage lockout (1.775V rising threshold), and soft-discharge via internal 120Ω resistor when EN is deasserted. These protections are verified in the Absolute Maximum Ratings (page 4), Functional Description (pages 8–9), and Typical Performance Curves (Figure 16).
ISL91110IRNZ-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):
- 3.3V
- 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-T7A FAQ
1.How can I place an order for ISL91110IRNZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IRNZ-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 ISL91110IRNZ-T7A reliable?
The price and inventory of ISL91110IRNZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IRNZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91110IRNZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IRNZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IRNZ-T7A?
ISL91110IRNZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IRNZ-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 ISL91110IRNZ-T7A?
For technical support, including ISL91110IRNZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IRNZ-T7A requirements.
6.How does Aetrix verify that ISL91110IRNZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91110IRNZ-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 ISL91110IRNZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91110IRNZ-T7A?
All ISL91110IRNZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IRNZ-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 ISL91110IRNZ-T7A part is unused and in its original packaging.
Return procedure for ISL91110IRNZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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