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Renesas ISL91110IRAZ-T
- Part No.:
- ISL91110IRAZ-T
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91110IRAZ-T.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,930
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Product details
Overview
ISL91110IRAZ-T from Intersil is a fully synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A continuous output at 3.3V across 2.5V–4.35V battery input, featuring 40mΩ/30mΩ P/N-FET ON-resistance, 2.5MHz switching frequency, and 35µA quiescent current. It enables brownout-free system voltage in smartphones and tablets using advanced single-cell Li-ion batteries.
For engineers reviewing the ISL91110IRAZ-T datasheet, ISL91110IRAZ-T pinout, ISL91110IRAZ-T application, or ISL91110IRAZ-T equivalent, key selection criteria include its seamless buck/boost mode transition, hiccup-mode overcurrent protection, WLCSP-25 package thermal resistance (θJB = 13°C/W), and support for adjustable (1.0V–5.2V) or fixed 3.3V/3.5V outputs.
Technical Context
The ISL91110IRAZ-T implements a proprietary 4-switch buck-boost topology with automatic mode transition logic that maintains regulation when PVIN ≈ VOUT, minimizing output ripple and maximizing efficiency across wide input/output differentials. Its control architecture integrates PWM and PFM modes, with load-dependent mode switching thresholds (75mA PWM→PFM, 200mA PFM→PWM).
Internal circuitry includes separate PVIN (power path) and VIN (bias supply) inputs, dual ground domains (PGND for high-current switching, SGND for analog reference), and integrated soft-start (1–3ms depending on mode) with programmable MODE pin for auto-PFM or forced PWM operation and external clock synchronization (2.75–3.25MHz).
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 and USB-powered operation |
| Output Current | 2A continuous (PVIN = 2.5V, VOUT = 3.3V) - sustains full load down to battery end-of-discharge |
| Switching Frequency | 2.5MHz (typ) - enables compact 1µH inductor and low-ESR ceramic capacitors |
| Quiescent Current | 35µA - extends battery runtime in standby and light-load states |
| Protection Features | Hiccup-mode overcurrent, thermal shutdown (155°C trip, 30°C hysteresis), UVLO (1.775V rising) |
| Package | 25-bump WLCSP (2.33mm × 2.07mm, 0.4mm pitch) - ultra-compact footprint for space-constrained mobile PCBs |
Pinout & Package
ISL91110IRAZ-T uses a 25-ball, 0.4mm-pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm. The package features bump-down orientation with ball A1 as pin 1 (top-left corner). Thermal performance is characterized by θJB = 13°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Main power input (1.8V–5.5V); requires 2×10µF ceramic caps to PGND for high-frequency decoupling |
| B1–B4, D1–D4 | LX1 / LX2 | Inductor connection nodes: LX1 (input-side switch node), LX2 (output-side switch node); handle peak currents up to 4.5A |
| C1–C3 | PGND | Power ground return for high di/dt switching currents; must be low-inductance plane under IC |
| E1–E4 | VOUT | Regulated output; connects to 2×22µF bulk capacitance; supports 1.0V–5.2V via FB divider or fixed 3.3V/3.5V |
| C4 | MODE | Logic-selectable operating mode: HIGH = auto-PFM, LOW = forced PWM; also accepts sync clock (2.75–3.25MHz) |
| A5 | VIN | Bias supply input (1.8V–5.5V); powers internal reference and control circuitry independently of PVIN |
| B5 | EN | Active-high enable; drives LOW to enter shutdown (ISD = 0.05–1.0µA); initiates soft-start on assertion |
| C5, D5 | SGND | Analog ground reference for FB, error amp, and internal references; must be isolated from PGND except at single point |
| E5 | FB | Feedback input (0.800V typ reference); senses output via resistor divider for adjustable versions; tied directly to VOUT for fixed-output variants |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/boost transition | Maintains regulation with <1% output ripple when PVIN ≈ VOUT - eliminates system brownouts during battery sag |
| Ultra-low quiescent current | 35µA in PFM mode - extends standby time in always-on mobile subsystems without compromising wake-up response |
| Integrated soft-discharge | 120Ω internal pull-down on VOUT during EN=LOW - safely discharges output caps without external circuitry |
| Hiccup-mode overcurrent protection | Shuts down for 40ms after 16 consecutive current-limit cycles - prevents thermal runaway during sustained short-circuit faults |
| Dual-ground architecture | Separate PGND (high-current switching return) and SGND (precision analog reference) - reduces noise coupling into feedback path |
Applications
| Smartphone System Rail | Tablet PMIC Core Supply |
|---|---|
|
Use Scenario: Powering application processor I/O or memory interface rails in smartphones operating from single-cell Li-ion (2.5V–4.35V). IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 3.3V rail despite battery voltage collapse below system requirements. Use Value: Eliminates brownout resets during high-current transmission bursts by sustaining regulated output down to 2.5V input. |
Use Scenario: Generating core logic voltage for tablet SoCs where input varies widely due to USB-C PD negotiation or battery aging. IC Role / Device Role / Timing Role: Adjustable-output (1.0V–5.2V) buck-boost converter supporting dynamic voltage scaling and multiple SoC configurations. Use Value: Enables single-BOM flexibility across product variants while maintaining >94% efficiency at 1A load across 2.8V–5.0V input range. |
| RF Power Amplifier Bias | Wireless Modem Subsystem |
|
Use Scenario: Supplying 3.3V bias to 2G/3G/4G RF power amplifiers with highly dynamic current demand (0–3A pulses). IC Role / Device Role / Timing Role: High-transient-response buck-boost regulator delivering burst current up to 3A (tON < 600µs) without output droop. Use Value: Maintains PA linearity and EVM compliance during LTE uplink bursts by limiting VOUT deviation to ±25mV at 2A step load. |
Use Scenario: Powering baseband processors and transceivers in cellular IoT modules with aggressive size and efficiency targets. IC Role / Device Role / Timing Role: Compact WLCSP-25 buck-boost regulator enabling direct battery-to-rail conversion in 10mm² PCB area budgets. Use Value: Reduces bill-of-materials count by eliminating intermediate LDO stages while achieving 96% peak efficiency at 500mA load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91110IINZ-T | Same die, identical electrical specs, but fixed 3.3V output (no FB divider required); shares same WLCSP-25 package and pinout. | Suitable for cost-sensitive designs where output voltage is invariant; eliminates two external resistors and layout area for feedback network. | Select ISL91110IINZ-T when fixed 3.3V output suffices and board space for FB divider is constrained. |
| ISL91110II2AZ-T | Same die, identical electrical specs, but fixed 3.5V output; otherwise matches ISL91110IRAZ-T in package, thermal, and transient performance. | Targeted at systems requiring higher I/O voltage margins (e.g., legacy interface standards or specific sensor interfaces). | Choose ISL91110II2AZ-T only when system-level voltage tolerance mandates 3.5V nominal rail instead of 3.3V. |
Compared with ISL91110IINZ-T and ISL91110II2AZ-T, the ISL91110IRAZ-T provides design flexibility through adjustable output (1.0V–5.2V) while retaining identical efficiency, thermal, and transient characteristics - making it optimal for multi-voltage platforms or prototyping where output voltage may evolve.
Availability
ISL91110IRAZ-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, long-term lifecycle assurance, and RoHS-compliant WLCSP packaging.
Supply support for ISL91110IRAZ-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
Intersil Corporation is a leader in precision analog and power management ICs, acquired by Renesas Electronics in 2017. Its products serve mobile computing, industrial infrastructure, and high-end consumer markets with emphasis on efficiency, integration, and reliability.
The ISL91110 family was designed specifically for advanced battery-powered devices requiring seamless voltage regulation across collapsing input ranges - targeting smartphones, tablets, and wireless communication equipment where brownout resilience is critical.
FAQ
What output voltage options does the ISL91110IRAZ-T support?
The ISL9110IRAZ-T is the adjustable-output variant of the ISL91110 family, supporting programmable output voltages from 1.0V to 5.2V using an external resistor divider connected to the FB pin. Its internal reference voltage is 0.800V (±1.7%), enabling precise regulation across the full range. Fixed-output versions (e.g., ISL91110IINZ-T at 3.3V) exist but are distinct part numbers - the ISL91110IRAZ-T itself requires external resistors for configuration.
How does the ISL91110IRAZ-T handle input voltage crossing the output voltage threshold?
The ISL91110IRAZ-T uses Intersil's proprietary 4-switch buck-boost algorithm to automatically and seamlessly transition between buck and boost modes when PVIN approaches VOUT. This avoids discontinuities in regulation, maintains output ripple below 10mVpp, and sustains >92% efficiency even when PVIN = VOUT ±0.2V - critical for stable operation during battery discharge in portable devices.
What protection features are integrated into the ISL91110IRAZ-T?
The ISL91110IRAZ-T integrates hiccup-mode overcurrent protection (triggered after 16 consecutive current-limit cycles, followed by 40ms shutdown), thermal shutdown (155°C trip with 30°C hysteresis), input undervoltage lockout (1.775V rising threshold), and short-circuit detection via FB monitoring. All protections operate without external components and restore automatically after fault clearance.
Can the ISL91110IRAZ-T synchronize to an external clock?
Yes - the MODE pin of the ISL91110IRAZ-T accepts an external clock signal in the 2.75MHz to 3.25MHz range, enabling synchronization with system timing sources to reduce EMI interference. When not used for sync, MODE sets operating mode: HIGH enables auto-PFM for light-load efficiency, LOW forces continuous PWM for predictable switching frequency and lower noise.
What is the thermal performance of the ISL91110IRAZ-T in its WLCSP package?
The ISL91110IRAZ-T in its 25-ball WLCSP (2.33mm × 2.07mm) has a junction-to-board thermal resistance (θJB) of 13°C/W, measured per JESD51-8. This enables reliable 2A continuous operation at +85°C ambient when mounted on a 4-layer PCB with adequate copper pour under the package. Its maximum junction temperature is +125°C, with thermal shutdown activating at +155°C.
ISL91110IRAZ-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.2V
- 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)
ISL91110IRAZ-T FAQ
1.How can I place an order for ISL91110IRAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IRAZ-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 ISL91110IRAZ-T reliable?
The price and inventory of ISL91110IRAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IRAZ-T is usually 5 days.
3.What payment methods are accepted for ISL91110IRAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IRAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IRAZ-T?
ISL91110IRAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IRAZ-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 ISL91110IRAZ-T?
For technical support, including ISL91110IRAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IRAZ-T requirements.
6.How does Aetrix verify that ISL91110IRAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91110IRAZ-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 ISL91110IRAZ-T meets industry standards.
7.What is the process for return or replacement of ISL91110IRAZ-T?
All ISL91110IRAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IRAZ-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 ISL91110IRAZ-T part is unused and in its original packaging.
Return procedure for ISL91110IRAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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