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Renesas ISL91110IINZ-T
- Part No.:
- ISL91110IINZ-T
- Manufacturer:
- Renesas
- Package:
- 25-UFBGA, WLCSP
- Datasheet:
-
ISL91110IINZ-T.pdf
- Description:
- IC REG BUCK BST 3.3V 2A 25WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,744
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Product details
Overview
ISL91110IINZ-T from Renesas Electronics (formerly Intersil) is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator IC designed for single-cell Li-ion battery systems requiring stable output voltage across wide input ranges. It delivers up to 2A continuous output at 3.3V with 1.8V–5.5V input, 2.5MHz switching frequency, 35µA quiescent current, and automatic seamless buck/boost mode transitions-enabling brownout-free operation in smartphones and tablets.
For engineers reviewing the ISL91110IINZ-T datasheet, ISL91110IINZ-T pinout, ISL91110IINZ-T application, or ISL91110IINZ-T equivalent, key selection criteria include its 25-ball WLCSP package, fixed 3.3V output, hiccup-mode overcurrent protection, thermal shutdown at 155°C, and compatibility with low-ESR ceramic capacitors and 1µH inductors in compact portable power designs.
Technical Context
The ISL91110IINZ-T implements a proprietary 4-switch buck-boost topology with integrated P- and N-channel MOSFETs (40mΩ/30mΩ rDS(ON)), enabling regulation when input voltage is above, below, or near the 3.3V output. Its control architecture dynamically selects buck or boost mode based on real-time VIN–VOUT differential, minimizing output ripple during mid-range battery discharge (e.g., 2.5V–4.35V).
It features dual operating modes: forced PWM (via MODE pin LOW) for constant-frequency noise control, and auto PFM (MODE HIGH) for ultra-low quiescent current at light loads. Soft-start (1–3ms depending on mode), internal 0.8V reference, and VOUT soft-discharge (120Ω) support reliable system power sequencing and safe turn-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% accuracy; eliminates external feedback resistors and reduces BOM count. |
| Input Voltage Range | 1.8V to 5.5V; supports full discharge of advanced Li-ion cells (2.5V–4.35V) without system brownout. |
| Continuous Output Current | 2A at VOUT = 3.3V, PVIN = 2.5V; sustains peak processor loads in mobile SoC applications. |
| Switching Frequency | 2.5MHz (typ); enables use of small 1µH inductors and compact 2×10µF/2×22µF ceramic capacitors. |
| Quiescent Current | 35µA in PFM mode; extends battery runtime during standby or low-activity states. |
| Protection Features | Short-circuit, over-temperature (155°C shutdown), undervoltage lockout (1.775V rising threshold), and hiccup-mode current limiting (4.5A peak). |
| Thermal Resistance | θJB = 13°C/W; supports high-power density layouts in space-constrained WLCSP footprint. |
Pinout & Package
ISL91110IINZ-T is housed in a 25-bump, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm, optimized for ultra-compact mobile PCBs with minimal thermal via requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Main power input (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 (buck high-side/boost low-side), LX2 to output side (buck low-side/boost high-side). |
| C1–C3 | PGND | Power ground return for switching currents; must be solid copper plane with short, direct connection to input/output capacitors. |
| E1–E4 | VOUT | Regulated 3.3V output; connects to 2×22µF ceramic bulk capacitance and load. |
| C4 | MODE | Mode select: HIGH enables auto PFM for efficiency, LOW forces PWM for EMI control; also accepts 2.75–3.25MHz sync clock. |
| A5 | VIN | Analog supply input (1.8V–5.5V); powers internal reference and control circuitry-separate from PVIN to improve noise immunity. |
| B5 | EN | Enable logic input (VIH = 1.4V, VIL = 0.4V); asserts device startup and initiates soft-start sequence upon HIGH transition. |
| C5, D5 | SGND | Analog ground reference for FB and internal error amplifier; must be isolated from PGND and tied at single point near IC. |
| E5 | FB | Feedback pin; internally connected to VOUT for fixed 3.3V version-no external divider required. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Seamless switching between topologies at VIN ≈ VOUT eliminates output voltage discontinuity and ripple spikes during battery discharge. |
| Ultra-low quiescent current | 35µA in PFM mode enables >100-hour standby in always-on IoT sensors without compromising regulation stability. |
| Integrated 4-switch synchronous architecture | Eliminates external MOSFETs and gate drivers; 40mΩ/30mΩ rDS(ON) ensures >96% peak efficiency at 2A load. |
| Hiccup-mode overcurrent protection | Shuts down for 40ms after 16 consecutive current-limit cycles, preventing thermal runaway during sustained short-circuit faults. |
| 2.5MHz constant-frequency PWM | Reduces inductor size by 4× vs. 600kHz converters and minimizes audible noise in audio-sensitive applications. |
Applications
| Smartphone System Rail | Tablet PMIC Core Supply |
|---|---|
|
Use Scenario: Powering application processors and memory subsystems during deep battery discharge (2.5V–3.6V). IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 3.3V core rail independent of battery voltage sag. Use Value: Prevents brownout resets and maintains full CPU performance down to 2.5V battery voltage. |
Use Scenario: Supplying I/O interfaces and display backlight drivers in multi-rail tablet power architectures. IC Role / Device Role / Timing Role: Secondary regulated rail generator with fast transient response to dynamic load steps. Use Value: Delivers 2A continuous current with <100mV output deviation during 0–2A load transients (100µs recovery). |
| RF Power Amplifier Bias | Wireless Modem Baseband |
|
Use Scenario: Providing clean, ripple-free bias voltage to 2G/3G/4G PA stages operating across varying battery states. IC Role / Device Role / Timing Role: High-efficiency, low-noise power stage with 2.5MHz switching to avoid RF band interference. Use Value: Achieves <15mVpp output ripple at 3.3V/1A, meeting stringent PA spectral purity requirements. |
Use Scenario: Powering baseband SoCs in LTE/Wi-Fi modules where sleep-mode current and wake-up speed are critical. IC Role / Device Role / Timing Role: Always-on LDO-replacement regulator with programmable PFM/PWM mode and 1ms soft-start delay. Use Value: Reduces system idle power by 60% vs. traditional LDOs while supporting sub-10ms wake-up from deep sleep. |
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 | 4.5A peak current limit, 3.2MHz switching, 20µA IQ; uses different 4-switch control algorithm with higher light-load ripple. | Targets higher-current industrial modules; lacks hiccup-mode protection and has tighter VIN min (2.2V). | Prefer MP2918GQ-Z only if >3A burst capability and faster transient response outweigh need for robust fault handling. |
| TPS63020DSJR | 2A continuous, 2.5MHz, 25µA IQ; employs hybrid buck-boost with lower rDS(ON) but no MODE pin for sync or PFM/PWM override. | Optimized for cost-sensitive wearables; fixed 3.3V option available but no adjustable variant in same package. | Choose TPS63020DSJR when board space allows larger 3mm × 2mm QFN and design does not require external clock synchronization. |
Compared with ISL91110IINZ-T, MP2918GQ-Z offers higher peak current but less comprehensive protection, while TPS63020DSJR provides lower quiescent current but sacrifices mode control flexibility and hiccup-mode safety-making ISL91110IINZ-T optimal for reliability-critical mobile power rails.
Availability
ISL91110IINZ-T is available at Aetrix Electronics and suitable for smartphone system rails, tablet PMIC core supplies, and RF power amplifier biasing requiring stable component supply across high-volume production cycles.
Supply support for ISL91110IINZ-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, and power management solutions, serving automotive, industrial, and consumer markets with ISO 9001-certified manufacturing.
The ISL91110 product line was engineered specifically for high-efficiency, space-constrained battery-powered devices-delivering seamless buck-boost conversion to maximize usable energy from advanced Li-ion chemistries in portable electronics.
FAQ
What is the maximum continuous output current supported by the ISL91110IINZ-T?
The ISL91110IINZ-T delivers up to 2A continuous output current at 3.3V when PVIN = 2.5V and ambient temperature is +25°C. This rating holds across the full –40°C to +85°C operating range under recommended PCB layout and thermal conditions. Peak burst current reaches 3A for short durations (tON < 600µs), enabling support for transient processor loads without voltage droop.
Does the ISL91110IINZ-T require external feedback resistors to set its output voltage?
No, the ISL91110IINZ-T is a fixed-output variant with factory-trimmed 3.3V regulation. Its FB pin is internally connected to VOUT, eliminating the need for external resistor dividers. This simplifies design, improves accuracy (±2% over temperature), and reduces component count compared to adjustable versions like ISL91110IIAZ.
How does the ISL91110IINZ-T handle input voltages close to the 3.3V output voltage?
The ISL91110IINZ-T uses Intersil's proprietary 4-switch buck-boost algorithm to automatically and seamlessly alternate between buck and boost modes when PVIN approaches 3.3V. This prevents output voltage discontinuity and maintains <15mVpp ripple-critical for noise-sensitive RF and audio circuits during mid-discharge battery operation.
What protection features are integrated into the ISL91110IINZ-T?
The ISL91110IINZ-T integrates short-circuit protection with hiccup-mode current limiting (4.5A peak), thermal shutdown at 155°C with 30°C hysteresis, input undervoltage lockout (1.775V rising threshold), and soft-discharge via internal 120Ω resistor on VOUT during disable. These features ensure robust operation in unregulated battery environments without external protection circuitry.
Can the ISL91110IINZ-T synchronize to an external clock signal?
Yes, the MODE pin of the ISL91110IINZ-T accepts an external clock input in the 2.75MHz to 3.25MHz range when pulled HIGH. This enables precise EMI control by aligning switching frequency with system clocks or avoiding sensitive frequency bands-without sacrificing PFM efficiency benefits during light loads.
ISL91110IINZ-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):
- 3.3V
- 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)
ISL91110IINZ-T FAQ
1.How can I place an order for ISL91110IINZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IINZ-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 ISL91110IINZ-T reliable?
The price and inventory of ISL91110IINZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IINZ-T is usually 5 days.
3.What payment methods are accepted for ISL91110IINZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IINZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IINZ-T?
ISL91110IINZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IINZ-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 ISL91110IINZ-T?
For technical support, including ISL91110IINZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IINZ-T requirements.
6.How does Aetrix verify that ISL91110IINZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91110IINZ-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 ISL91110IINZ-T meets industry standards.
7.What is the process for return or replacement of ISL91110IINZ-T?
All ISL91110IINZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IINZ-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 ISL91110IINZ-T part is unused and in its original packaging.
Return procedure for ISL91110IINZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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