My Inquiry
My Account
Renesas ISL91110IINZ-T7A
- Part No.:
- ISL91110IINZ-T7A
- Manufacturer:
- Renesas
- Package:
- 25-UFBGA, WLCSP
- Datasheet:
-
ISL91110IINZ-T7A.pdf
- Description:
- IC REG BUCK BST 3.3V 2A 25WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL91110IINZ-T7A from Renesas (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 3.3V 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 space-constrained mobile power rails.
For engineers reviewing the ISL91110IINZ-T7A datasheet, ISL91110IINZ-T7A pinout, ISL91110IINZ-T7A application, or ISL91110IINZ-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 3.3V fixed-output buck-boost regulation.
Technical Context
The ISL91110IINZ-T7A implements a proprietary 4-switch buck-boost topology with integrated P- and N-channel MOSFETs (rDS(ON) = 40mΩ/30mΩ), enabling regulation when input voltage crosses output-critical for maintaining 3.3V system rail stability as Li-ion voltage drops from 4.35V to 2.5V. Its 2.5MHz oscillator supports compact 1µH inductors and low-ESR ceramic capacitors.
Operation includes auto PFM/PWM mode switching (transition thresholds: 75mA/200mA), hiccup-mode overcurrent protection (4.5A peak limit), thermal shutdown at 155°C, and soft-discharge via 120Ω internal VOUT-to-SGND resistor upon EN deassertion-ensuring safe power sequencing in portable electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% accuracy; eliminates external feedback divider and reduces BOM count. |
| Continuous Output Current | 2A at VIN = 2.5V, VOUT = 3.3V; sustains full system load down to end-of-battery discharge. |
| Switching Frequency | 2.5MHz typical; enables use of 1µH inductor and minimizes footprint of external passives. |
| Quiescent Current | 35µA in PFM mode; extends standby battery life in always-on subsystems (e.g., PMIC backup rails). |
| Input Voltage Range | 1.8V to 5.5V; supports wide battery chemistries (Li-ion, Li-poly, LiFePO4) and USB-powered operation. |
| Peak Switch Current Limit | 4.5A; handles short-duration RF PA burst loads (e.g., 3G/4G transmit pulses) without foldback. |
| Thermal Resistance θJB | 13°C/W; enables >2A operation in 2.33mm × 2.07mm WLCSP without forced airflow. |
Pinout & Package
ISL91110IINZ-T7A uses a 25-ball, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP), measuring 2.33mm × 2.07mm. The package is RoHS-compliant, Pb-free, and MSL3 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Main power input (1.8V–5.5V); requires dual 10µF X5R ceramic caps to PGND for low-impedance decoupling. |
| C1–C3 | PGND | Power ground return for high di/dt LX1/LX2 switching currents; must be solid copper plane under IC. |
| D1–D4 | LX2 | Output-side inductor node; connects to one terminal of 1µH shielded inductor in buck-boost loop. |
| E1–E4 | VOUT | Regulated 3.3V output; requires dual 22µF X5R ceramic caps to PGND for low ripple under dynamic load. |
| C4 | MODE | Selects auto PFM (HIGH) or forced PWM (LOW); also accepts external sync clock (2.75–3.25MHz). |
| A5 | VIN | Analog supply input (1.8V–5.5V); powers internal reference and control circuitry-separate from PVIN for noise isolation. |
| B5 | EN | Active-HIGH enable; asserts internal soft-start and disables VOUT discharge when HIGH; pulls VOUT low via 120Ω resistor when LOW. |
| C5, D5 | SGND | Analog ground reference for FB, MODE, EN; must be star-connected to PGND at single point near IC. |
| E5 | FB | Feedback pin; internally tied to VOUT for fixed 3.3V operation-no external resistor divider required. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost mode transition | Zero-crossing detection ensures seamless regulation when PVIN ≈ VOUT-eliminates output glitches during battery sag. |
| 4-switch synchronous architecture | Integrated 40mΩ PFET / 30mΩ NFET switches maximize efficiency (>90% at 500mA, VIN=3.3V) and reduce thermal stress. |
| Hiccup-mode overcurrent protection | Trips after 16 consecutive cycles at 4.5A peak; resets automatically after 40ms-protects against sustained shorts without latch-off. |
| 2.5MHz constant-frequency PWM | Enables <1mm² total passive area (1µH + 4×ceramic caps); critical for ultra-thin smartphone and wearable PCBs. |
| Soft-discharge on disable | 120Ω internal VOUT-to-SGND resistor safely discharges output caps in ~10ms-prevents backfeed into powered-down subsystems. |
Applications
| Smartphone System Rail | Tablet Baseband Power |
|---|---|
Use Scenario: Maintaining stable 3.3V core voltage for AP/SoC I/O while Li-ion battery discharges from 4.35V to 2.5V. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering 2A continuous, 3A burst power with <10mV line/load transient deviation. Use Value: Eliminates brownouts during high-CPU-load video playback or camera capture at low battery state. |
Use Scenario: Supplying clean 3.3V to LTE modem baseband processor in dual-SIM tablets with aggressive power cycling. IC Role / Device Role / Timing Role: Always-on system rail regulator with 35µA quiescent current and fast 2ms soft-start into boost mode. Use Value: Extends standby time by >15% versus legacy 1.5MHz regulators; enables instant wake-from-sleep response. |
| RF Power Amplifier Bias | Wireless IoT Sensor Hub |
Use Scenario: Providing 3.3V bias to 2G/3G/4G RF PA stages during high-PAPR transmission bursts. IC Role / Device Role / Timing Role: High-dV/dt capable buck-boost stage supporting 3A pulsed load (tON < 600µs) with <50mV undershoot. Use Value: Prevents PA gain compression and spectral regrowth caused by rail droop during TX ramp-up. |
Use Scenario: Powering BLE/Wi-Fi SoC, sensors, and flash memory in battery-operated industrial asset trackers. IC Role / Device Role / Timing Role: Single-chip 3.3V regulator with hiccup-mode fault recovery and -40°C to +85°C operation. Use Value: Enables 10-year field deployment on primary Li-SOCl₂ cells without manual reset or firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2910AGQ-Z | Fixed 3.3V output; 2.2MHz switching; 40mΩ/35mΩ FETs; no MODE pin; 50µA IQ | Lacks external clock sync and PFM/PWM selection; lower light-load efficiency | Choose for cost-sensitive designs where sync capability and ultra-low IQ are non-critical |
| TPS63802DLAR | Adjustable 1.8–5.5V output; 2.4MHz; 32mΩ/22mΩ FETs; 25µA IQ; integrated soft-start | Requires external resistor divider; higher max output voltage range but no fixed 3.3V variant | Choose when adjustable output or lower quiescent current outweighs need for pin-compatible drop-in replacement |
Compared with MP2910AGQ-Z and TPS63802DLAR, the ISL91110IINZ-T7A uniquely combines fixed 3.3V output, 2.5MHz operation, MODE pin flexibility, and 35µA IQ in a 2.33mm × 2.07mm WLCSP-making it optimal for space-constrained, battery-life-critical mobile applications requiring zero-design-effort integration.
Availability
ISL91110IINZ-T7A is available at Aetrix Electronics and suitable for smartphone system rails, tablet baseband power, and RF power amplifier bias requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL91110IINZ-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 ISO 9001-certified manufacturing.
The ISL91110 product line was engineered specifically for high-efficiency, small-footprint buck-boost regulation in advanced mobile devices using next-generation single-cell batteries-prioritizing seamless mode transition, ultra-low IQ, and thermal robustness.
FAQ
What is the maximum continuous output current of the ISL91110IINZ-T7A at 3.3V output?
The ISL91110IINZ-T7A delivers up to 2A continuous output current at 3.3V when input voltage is 2.5V-verified per datasheet Figure 2 and Table "Recommended Operating Conditions." This rating holds across the full -40°C to +85°C ambient range and enables full-power operation through deep battery discharge in smartphones and tablets.
Does the ISL91110IINZ-T7A require external feedback resistors to set its 3.3V output?
No. The ISL91110IINZ-T7A is a fixed 3.3V output variant-the FB pin is internally connected to VOUT, eliminating the need for external resistors. This simplifies layout, reduces component count, and improves accuracy versus adjustable versions that depend on resistor tolerance and PCB leakage.
What package type and dimensions does the ISL91110IINZ-T7A use?
The ISL91110IINZ-T7A uses a 25-ball, 0.4mm pitch Wafer-Level Chip-Scale Package (WLCSP) measuring 2.33mm × 2.07mm with 0.265mm ball diameter. Its RoHS-compliant, Pb-free construction meets MSL3 reflow requirements per J-STD-020.
How does the ISL91110IINZ-T7A handle input voltages near the 3.3V output level?
The ISL91110IINZ-T7A automatically and seamlessly transitions between buck and boost modes when PVIN approaches VOUT-maintaining regulation with <10mV ripple and no output glitch. This behavior is enabled by its proprietary control algorithm and verified in Figure 12 (VIN = 2.5V → VOUT = 3.3V, 2A load).
What protection features are integrated into the ISL91110IINZ-T7A?
The ISL91110IINZ-T7A integrates short-circuit protection with hiccup-mode recovery (4.5A peak limit), thermal shutdown at 155°C with 30°C hysteresis, input undervoltage lockout (1.775V rising threshold), and soft-discharge via 120Ω internal resistor-providing comprehensive fault resilience without external components.
ISL91110IINZ-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):
- 3.3V
- 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-T7A FAQ
1.How can I place an order for ISL91110IINZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IINZ-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 ISL91110IINZ-T7A reliable?
The price and inventory of ISL91110IINZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IINZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91110IINZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IINZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IINZ-T7A?
ISL91110IINZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IINZ-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 ISL91110IINZ-T7A?
For technical support, including ISL91110IINZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IINZ-T7A requirements.
6.How does Aetrix verify that ISL91110IINZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91110IINZ-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 ISL91110IINZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91110IINZ-T7A?
All ISL91110IINZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IINZ-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 ISL91110IINZ-T7A part is unused and in its original packaging.
Return procedure for ISL91110IINZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL91110IINZ-T7A Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
