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Renesas ISL91110II2AZ-T7A
- Part No.:
- ISL91110II2AZ-T7A
- Manufacturer:
- Renesas
- Package:
- 25-UFBGA, WLCSP
- Datasheet:
-
ISL91110II2AZ-T7A.pdf
- Description:
- IC REG BUCK BST 3.5V 2A 25WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:734
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Product details
Overview
ISL91110II2AZ-T7A 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. It delivers up to 2A continuous output at 3.5V across an input range of 1.8V–5.5V, features 2.5MHz switching frequency, 35µA quiescent current, and automatic seamless buck/boost mode transitions-enabling brownout-free system voltage in smartphones and tablets.
For engineers reviewing the ISL91110II2AZ-T7A datasheet, ISL91110II2AZ-T7A pinout, ISL91110II2AZ-T7A application, or ISL91110II2AZ-T7A 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 3.5V fixed-output buck-boost regulation.
Technical Context
The ISL91110II2AZ-T7A implements a proprietary 4-switch synchronous buck-boost topology with integrated 40mΩ P-FET and 30mΩ N-FET power switches, enabling continuous regulation when input voltage crosses the 3.5V output. Its control architecture combines PWM and PFM modes, with automatic transition thresholds at 75mA (PWM→PFM) and 200mA (PFM→PWM), ensuring optimal efficiency across light and heavy loads.
It integrates hiccup-mode overcurrent protection triggered after 16 consecutive peak-current-limit cycles, thermal shutdown at +155°C with +30°C hysteresis, and soft-discharge via a 120Ω internal VOUT-to-SGND resistor upon EN deactivation. The MODE pin supports auto-PFM operation or forced PWM, and accepts external clock sync from 2.75MHz to 3.25MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.5V - eliminates need for external feedback resistors; enables plug-and-play integration in space-constrained mobile designs. |
| Continuous Output Current | 2A at VOUT = 3.5V, PVIN = 2.5V - sustains full system load during deep battery discharge down to 2.5V. |
| Switching Frequency | 2.5MHz (typ) - allows use of compact 1µH inductors and small ceramic capacitors (2×10µF input, 2×22µF output). |
| Quiescent Current | 35µA in PFM mode - extends battery runtime in standby or low-power listening states without compromising wake-up responsiveness. |
| Input Voltage Range | 1.8V to 5.5V - supports wide battery chemistries including Li-ion (2.5V–4.35V), Li-polymer, and hybrid configurations. |
| Peak Current Limit | 4.5A - handles transient burst loads (e.g., RF PA activation) up to 3A for ≤600µs without foldback or shutdown. |
| Thermal Resistance θJB | 13°C/W - enables reliable 2A operation in the 2.33mm × 2.07mm WLCSP without external heatsinking under +85°C ambient. |
Pinout & Package
ISL91110II2AZ-T7A is housed in a 25-bump, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm, RoHS-compliant and MSL3 rated. The package uses non-solder-mask-defined (NSMD) pads and SnAgCu e1 solder balls compatible with both SnPb and Pb-free reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Primary power input (1.8V–5.5V); must connect dual 10µF X5R ceramics directly to PGND to minimize high-frequency ripple and EMI. |
| C1–C3 | PGND | Power ground return for LX1/LX2 switching currents; requires low-inductance copper pour beneath package to prevent shoot-through and voltage spikes. |
| D1–D4 | LX2 | Output-side inductor node; connects to one end of 1µH shielded inductor; routing must avoid coupling to sensitive analog traces (FB, MODE). |
| E1–E4 | VOUT | Regulated 3.5V output; connects dual 22µF X5R ceramics to PGND; trace width must support ≥2A RMS current with minimal IR drop. |
| C4 | MODE | Mode control: HIGH = auto-PFM (light-load efficiency), LOW = forced PWM (low-noise, constant fSW); also accepts 2.75–3.25MHz sync clock. |
| A5 | VIN | Analog supply input (1.8V–5.5V); powers internal reference and error amplifier; decoupled separately with 0.1µF ceramic near pin. |
| B5 | EN | Enable logic input: VIH ≥1.4V, VIL ≤0.4V; asserts internal soft-start; drives LOW to activate 120Ω VOUT soft-discharge path. |
| C5, D5 | SGND | Analog ground reference for FB, COMP, and internal bias circuits; must be star-connected to PGND at single point to avoid noise injection. |
| E5 | FB | Feedback pin - internally shorted to VOUT in fixed-3.5V version (ISL91110II2AZ-T7A); unused but must remain unconnected or tied to VOUT per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost mode transition | Seamless crossover at VIN ≈ VOUT eliminates output voltage discontinuity and reduces ripple to <20mVPP during battery sag or surge events. |
| 4-switch synchronous architecture | Integrated 40mΩ P-FET and 30mΩ N-FET switches eliminate external MOSFETs and gate drivers, reducing BOM count and PCB area by >30% vs discrete solutions. |
| Hiccup-mode overcurrent protection | Shuts down for 40ms after 16 consecutive current-limit cycles, then retries soft-start - prevents thermal runaway during sustained short-circuit conditions. |
| 2.5MHz constant-frequency PWM | Enables use of 1µH inductors with saturation current ≥4A, cutting external component volume by ~50% versus 500kHz alternatives. |
| 35µA quiescent current | Maintains >85% efficiency at 100µA load - critical for always-on subsystems (e.g., baseband processors, sensor hubs) in battery-powered devices. |
Applications
| Smartphone System Voltage Regulation | Tablet PC Power Management |
|---|---|
|
Use Scenario: Maintaining stable 3.5V system rail as Li-ion battery discharges from 4.2V to 2.5V during active multimedia playback. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying SoC core voltage; operates in boost mode below 3.5V input, buck mode above, with sub-100ns transition latency. Use Value: Prevents brownout resets and maintains CPU/GPU performance throughout full battery cycle without requiring larger battery or additional LDOs. |
Use Scenario: Powering 3.5V display interface and memory subsystem during simultaneous LTE transmission and video decode. IC Role / Device Role / Timing Role: High-current buck-boost converter delivering up to 2A with <10mV load transient deviation (0–2A step, 100µs response). Use Value: Eliminates need for separate boost and buck converters, reducing solution size by 40% and improving overall power efficiency by 3–5% vs dual-regulator approach. |
| 2G/3G/4G RF Power Amplifier Supply | Wireless Communication Baseband IC |
|
Use Scenario: Providing clean, ripple-free 3.5V supply to multi-band RF PA during high-Power LTE uplink bursts. IC Role / Device Role / Timing Role: Dynamic voltage regulator responding to PA enable/disable signals; MODE pin synchronized to baseband clock to suppress switching noise in RF band. Use Value: Achieves <−65dBc PSRR at 2.1GHz and <20mVPP output ripple, preventing AM-to-PM distortion and meeting 3GPP ACLR requirements. |
Use Scenario: Supplying 3.5V to baseband processor during low-duty-cycle GPS acquisition and Bluetooth LE advertising. IC Role / Device Role / Timing Role: Ultra-low-IQ buck-boost regulator operating in PFM mode between bursts; EN pin controlled by PMIC to gate power during sleep states. Use Value: Extends battery life by 18% in intermittent-use scenarios versus standard PWM-only regulators, verified at 100µA average 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 |
|---|---|---|---|
| MP2918GQ-Z | Fixed 3.3V output; 3.0MHz switching; 30µA IQ; 2.2A continuous; no MODE pin sync capability. | Requires board redesign if 3.5V output is mandatory; better suited for 3.3V SoC rails with tighter noise budgets. | Select MP2918GQ-Z only when system voltage tolerance permits 3.3V and higher-frequency operation is prioritized over programmable mode control. |
| TPS63020DSJR | Adjustable output (0.9–5.5V); 2.4A continuous; 2.4MHz; 32µA IQ; no hiccup-mode OCP; different pinout and layout. | Requires external resistor divider and compensation components; lacks integrated soft-discharge and MODE-driven clock sync. | Choose TPS63020DSJR when flexible output voltage tuning is needed and design can accommodate added BOM complexity and layout revision. |
Compared with MP2918GQ-Z and TPS63020DSJR, the ISL91110II2AZ-T7A uniquely delivers factory-trimmed 3.5V output with hiccup-mode protection, MODE-pin clock synchronization, and validated 2A performance across the full 1.8V–5.5V input range - making it the most direct fit for space-constrained, battery-powered 3.5V system rails requiring zero external feedback components.
Availability
ISL91110II2AZ-T7A is available at Aetrix Electronics and suitable for smartphone system voltage regulation, tablet PC power management, 2G/3G/4G RF power amplifier supply, and wireless communication baseband IC applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant WLCSP packaging.
Supply support for ISL91110II2AZ-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 consumer markets with ISO9001-certified manufacturing and reliability-tested products.
The ISL91110 product line was engineered specifically for advanced single-cell battery systems in mobile computing, delivering high-efficiency buck-boost conversion with minimal external components and robust protection for Li-ion/Li-polymer voltage ranges.
FAQ
What is the output voltage of the ISL91110II2AZ-T7A?
The ISL91110II2AZ-T7A is a fixed-output variant delivering precisely 3.5V regulated output. This is achieved internally via factory-trimmed feedback, eliminating the need for external resistor dividers. The FB pin is internally shorted to VOUT and must not be externally loaded or modified to maintain accuracy and stability.
Does the ISL91110II2AZ-T7A require external feedback components?
No, the ISL91110II2AZ-T7A does not require external feedback components. As a fixed 3.5V output version, its feedback network is integrated and trimmed at wafer test. The FB pin is internally connected to VOUT; connecting external resistors or capacitors to FB will disrupt regulation and is strictly prohibited per the datasheet.
What package type and dimensions does the ISL91110II2AZ-T7A use?
The ISL91110II2AZ-T7A uses a 25-ball, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm. It features NSMD pads, SnAgCu e1 solder balls, and complies with MSL Level 3 moisture sensitivity per J-STD-020, requiring bake prior to reflow if exposed beyond floor life.
How does the MODE pin function on the ISL91110II2AZ-T7A?
The MODE pin on the ISL91110II2AZ-T7A controls operating mode: driven HIGH (≥1.4V) enables auto-PFM for maximum light-load efficiency; driven LOW (≤0.4V) forces continuous PWM for low-noise, constant-frequency operation. It also accepts external clock sync signals from 2.75MHz to 3.25MHz to reduce EMI through frequency dithering.
What protection features are integrated into the ISL91110II2AZ-T7A?
The ISL91110II2AZ-T7A integrates short-circuit protection with hiccup-mode recovery, thermal shutdown at +155°C (±10°C) with +30°C hysteresis, input undervoltage lockout (UVLO) with 1.775V rising threshold, and soft-discharge via a 120Ω internal resistor activated when EN is pulled LOW - all without requiring external components.
ISL91110II2AZ-T7A 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):
- 3.5V
- 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)
ISL91110II2AZ-T7A FAQ
1.How can I place an order for ISL91110II2AZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110II2AZ-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 ISL91110II2AZ-T7A reliable?
The price and inventory of ISL91110II2AZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110II2AZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91110II2AZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110II2AZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110II2AZ-T7A?
ISL91110II2AZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110II2AZ-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 ISL91110II2AZ-T7A?
For technical support, including ISL91110II2AZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110II2AZ-T7A requirements.
6.How does Aetrix verify that ISL91110II2AZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91110II2AZ-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 ISL91110II2AZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91110II2AZ-T7A?
All ISL91110II2AZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110II2AZ-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 ISL91110II2AZ-T7A part is unused and in its original packaging.
Return procedure for ISL91110II2AZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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