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Renesas ISL91110IRAZ-T7A
- Part No.:
- ISL91110IRAZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91110IRAZ-T7A.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:208
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Product details
Overview
ISL91110IRAZ-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. 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 system voltage in smartphones and tablets.
For engineers reviewing the ISL91110IRAZ-T7A datasheet, ISL91110IRAZ-T7A pinout, ISL91110IRAZ-T7A application, or ISL91110IRAZ-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 fixed 3.3V buck-boost regulation.
Technical Context
The ISL91110IRAZ-T7A implements a proprietary 4-switch buck-boost topology with integrated high-side and low-side P/N-MOSFETs (rDS(ON) = 40mΩ/30mΩ @ 3.6V), enabling regulation when input voltage crosses output. Its control architecture combines PWM and PFM modes, with automatic transition thresholds at 75mA (PWM→PFM) and 200mA (PFM→PWM).
Thermal protection activates at +155°C with +30°C hysteresis; hiccup-mode overcurrent protection triggers after 16 consecutive peak-current-limit cycles (4.5A typical), followed by 40ms shutdown and soft-start recovery. The MODE pin supports auto-PFM (HIGH) or forced PWM (LOW), and accepts external clock sync (2.75–3.25MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% accuracy; eliminates need for external feedback resistors in standard applications. |
| Input Voltage Range | 1.8V to 5.5V; supports full discharge of advanced Li-ion cells (2.5V–4.35V) while maintaining regulated 3.3V rail. |
| Continuous Output Current | 2A at VOUT = 3.3V, PVIN = 2.5V; enables sustained operation under heavy baseband or RF PA loads. |
| Switching Frequency | 2.5MHz (typ); allows use of compact 1µH inductors and minimizes EMI filtering requirements. |
| Quiescent Current | 35µA in PFM mode; extends battery runtime during idle/sleep states without sacrificing wake-up response. |
| Peak Current Limit | 4.5A (typ); sustains short-duration burst loads (e.g., 3A for 4.6ms) common in cellular transmit events. |
| Thermal Resistance θJB | 13°C/W; enables high-power density layout on thin PCBs with minimal copper area. |
Pinout & Package
ISL91110IRAZ-T7A 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 efficiency via direct die-to-board conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (A1–A4, B1–B4) | Power input supply | Accepts 1.8V–5.5V; requires dual 10µF ceramic caps to PGND for low-impedance high-frequency decoupling. |
| LX1 (B1–B4) | High-side switch node (buck input / boost output) | Connects to one end of power inductor; carries high di/dt currents in both buck and boost phases. |
| PGND (C1–C3) | Power ground return | Low-inductance path for switching currents; must be solid copper plane directly under WLCSP footprint. |
| LX2 (D1–D4) | Low-side switch node (buck output / boost input) | Connects to second inductor terminal; shares current path with PGND during synchronous rectification. |
| VOUT (E1–E4) | Regulated output | Delivers up to 2A at 3.3V; requires dual 22µF ceramic output capacitors for low ripple and transient response. |
| MODE (C4) | Operating mode control | Logic HIGH enables auto-PFM for light-load efficiency; LOW forces PWM for predictable frequency and low noise. |
| VIN (A5) | Analog supply input | Provides stable bias for internal reference and error amplifier; must be decoupled independently from PVIN. |
| EN (B5) | Enable control | Active-HIGH logic input; asserts internal startup sequence and disables soft-discharge resistor when deasserted. |
| SGND (C5, D5) | Analog ground reference | Separate ground for FB and internal analog circuitry; must be connected to PGND at single point near IC. |
| FB (E5) | Feedback input | Internally tied to VOUT for fixed 3.3V version; unused but must be left floating (not grounded) per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Seamless crossover at VIN ≈ VOUT eliminates output voltage discontinuity and audible inductor noise during battery discharge. |
| 2.5MHz constant-frequency PWM | Enables <1mm² total passive area (1µH + 2×10µF + 2×22µF), critical for space-constrained mobile PCBs. |
| 35µA quiescent current | Reduces no-load power loss to <115µW at 3.3V, extending standby time in always-on sensor or modem subsystems. |
| Hiccup-mode overcurrent protection | Prevents thermal runaway during sustained shorts by cycling 40ms off-time + soft-start, preserving MOSFET SOA. |
| Integrated soft-discharge | 120Ω internal pull-down on VOUT during disable ensures safe discharge of output capacitance without external circuitry. |
Applications
| Smartphone System Rail | Tablet Baseband Power |
|---|---|
Use Scenario: Maintaining stable 3.3V core voltage as single-cell Li-ion discharges from 4.35V to 2.5V during active screen and app usage. IC Role / Device Role / Timing Role: Primary system buck-boost regulator delivering uninterrupted power to AP/SoC I/O rails and PMIC inputs. Use Value: Eliminates brownouts and resets by sustaining regulation across full battery range, improving user experience and system reliability. | Use Scenario: Supplying clean, regulated 3.3V to LTE/Wi-Fi baseband processors during high-throughput data transfers with dynamic current demand. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter feeding downstream LDOs and DC/DCs in multi-rail power tree. Use Value: 96% peak efficiency and 2.5MHz operation minimize heat generation and enable smaller thermal pads in slim tablet form factors. |
| 2G/3G/4G RF Power Amplifier Bias | Wireless Communication Module |
Use Scenario: Providing dynamically adjustable 3.3V bias to cellular RF PAs during transmit bursts requiring up to 3A peak current for <5ms. IC Role / Device Role / Timing Role: High-current buck-boost controller with fast transient response and hiccup-mode fault containment. Use Value: 4.5A peak current limit and <2ms soft-start ensure rapid, overshoot-free voltage ramp into PA turn-on, meeting 3GPP timing specs. | Use Scenario: Powering compact IoT modules (e.g., NB-IoT, LTE-M) operating from primary Li-ion or coin-cell sources with wide input variation. IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete buck+boost combinations in size- and cost-sensitive designs. Use Value: Reduces BOM count by 7+ components (inductors, FETs, drivers, controllers) while improving efficiency over 80% across 2.5–4.2V input. |
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 | Fixed 3.3V output; 2.2MHz switching; 3.5A peak current; 28µA IQ; QFN-16 package (3mm×3mm) | Higher peak current and lower IQ, but larger footprint and no MODE pin for external clock sync | Preferred for higher burst-current apps where board area permits QFN; not drop-in due to different pinout and package. |
| TPS63020DSJR | Adjustable/fixed 3.3V; 2.4MHz; 4A peak; 25µA IQ; 12-pin WSON (3mm×2mm) | Supports wider input (1.8–5.5V) and higher output current, but lacks hiccup-mode OCP and has no MODE pin | Best for designs needing >2A continuous or tighter line/load regulation; requires redesign of feedback network for fixed-VOUT use. |
Compared with ISL91110IRAZ-T7A, MP2918GQ-Z offers lower quiescent current and higher peak current in a larger QFN, while TPS63020DSJR provides greater output flexibility and current headroom in a slightly larger WSON-but neither replicates the ISL91110's combination of 25-ball WLCSP size, hiccup-mode protection, and MODE pin sync capability.
Availability
ISL91110IRAZ-T7A is available at Aetrix Electronics and suitable for smartphone system rails, tablet baseband power, 2G/3G/4G RF power amplifier bias, and wireless communication modules requiring stable component supply across industrial temperature range (-40°C to +85°C).
Supply support for ISL91110IRAZ-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, and power management solutions, serving automotive, industrial, and consumer markets with ISO9001-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 single-cell Li-ion chemistries.
FAQ
What is the maximum continuous output current of the ISL91110IRAZ-T7A?
The ISL91110IRAZ-T7A 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 with proper PCB thermal design. Peak burst current reaches 3A for durations under 4.6ms, supporting cellular transmit events without dropout.
Does the ISL91110IRAZ-T7A require external feedback resistors?
No. The ISL91110IRAZ-T7A is the fixed 3.3V output variant; its FB pin is internally connected to VOUT, eliminating external resistor dividers. Per datasheet guidance, the FB pin must remain unconnected (floating) - not grounded or tied elsewhere - to ensure correct regulation and avoid damage.
What package type and dimensions does the ISL91110IRAZ-T7A use?
The ISL91110IRAZ-T7A uses a 25-ball Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch, measuring 2.33mm × 2.07mm. It complies with RoHS and MSL3 standards, and requires NSMD (Non-Solder-Mask-Defined) land patterns per Intersil TB451 for reliable reflow assembly.
How does the ISL91110IRAZ-T7A handle input voltage crossing the output voltage?
The ISL91110IRAZ-T7A automatically and seamlessly transitions between buck and boost modes using its proprietary 4-switch algorithm. When PVIN approaches 3.3V, it modulates duty cycle and switch pairing in real time - no external control or mode pin required - maintaining <±2% output regulation and minimizing ripple below 20mVpp.
What protection features are integrated into the ISL91110IRAZ-T7A?
The ISL91110IRAZ-T7A integrates short-circuit protection with hiccup-mode response, thermal shutdown at +155°C (with +30°C hysteresis), input undervoltage lockout (UVLO at 1.775V rising), and soft-discharge via internal 120Ω resistor on VOUT during disable. All protections operate autonomously without external components.
ISL91110IRAZ-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:
- 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-T7A FAQ
1.How can I place an order for ISL91110IRAZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IRAZ-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 ISL91110IRAZ-T7A reliable?
The price and inventory of ISL91110IRAZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IRAZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91110IRAZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IRAZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IRAZ-T7A?
ISL91110IRAZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IRAZ-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 ISL91110IRAZ-T7A?
For technical support, including ISL91110IRAZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IRAZ-T7A requirements.
6.How does Aetrix verify that ISL91110IRAZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91110IRAZ-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 ISL91110IRAZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91110IRAZ-T7A?
All ISL91110IRAZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IRAZ-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 ISL91110IRAZ-T7A part is unused and in its original packaging.
Return procedure for ISL91110IRAZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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