My Inquiry
My Account
Renesas ISL91110IIAZ-T7A
- Part No.:
- ISL91110IIAZ-T7A
- Manufacturer:
- Renesas
- Package:
- 25-UFBGA, WLCSP
- Datasheet:
-
ISL91110IIAZ-T7A.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 25WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:32,934
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL91110IIAZ-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 with input voltage crossing the output rail. It delivers up to 2A continuous output at 3.3V across 2.5V–4.35V battery range, features 2.5MHz switching frequency, 35µA quiescent current, and automatic seamless buck/boost mode transition. It enables brownout-free system voltage in smartphones and tablets.
For engineers reviewing the ISL91110IIAZ-T7A datasheet, ISL91110IIAZ-T7A pinout, ISL91110IIAZ-T7A application, or ISL91110IIAZ-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 adjustable-output buck-boost regulation.
Technical Context
The ISL91110IIAZ-T7A implements a proprietary 4-switch synchronous buck-boost topology with integrated high-side and low-side PFET/NFET power switches (rDS(ON) = 40mΩ/30mΩ @ 3.6V). Its control architecture automatically selects buck, boost, or hybrid operation based on real-time PVIN–VOUT differential, enabling stable regulation when input voltage crosses the output setpoint.
It supports adjustable output via external resistor divider (FB pin reference = 0.800V ±1.7mV), operates in PFM mode below 75mA load for ultra-low IQ, and transitions to forced PWM above 200mA. Protection includes hiccup-mode overcurrent (4.5A peak limit), thermal shutdown at 155°C, and undervoltage lockout (1.775V rising threshold).
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 including sub-3V brownout regions |
| Output Voltage Range | 1.0V to 5.2V - programmable via FB resistor divider; VFB = 0.800V ±1.7mV |
| Continuous Output Current | 2A @ VOUT = 3.3V, VIN = 2.5V - sufficient for SoC core rails and RF PA biasing |
| Switching Frequency | 2.5MHz (typ) - enables use of compact 1µH inductor and small ceramic capacitors |
| Quiescent Current | 35µA in PFM mode - extends battery runtime during light-load standby states |
| Peak Current Limit | 4.5A - protects internal FETs during short-circuit or heavy transient loads |
Pinout & Package
ISL91110IIAZ-T7A uses a 25-bump, 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 2×10µF ceramic decoupling to PGND |
| B1–B4, D1–D4 | LX1 / LX2 | Inductor connection nodes - LX1 is input-side switch node, LX2 is output-side switch node |
| C1–C3 | PGND | Power ground for high di/dt switching currents; must be low-inductance plane under IC |
| E1–E4 | VOUT | Regulated output; requires 2×22µF ceramic bulk capacitance to PGND |
| C4 | MODE | Selects auto PFM (HIGH) or forced PWM (LOW); also accepts external sync clock (2.75–3.25MHz) |
| A5 | VIN | Analog supply input for internal reference generation; separate from PVIN for noise isolation |
| B5 | EN | Active-high enable; drives LOW to enter shutdown (ISD = 0.05–1.0µA) |
| C5, D5 | SGND | Analog ground reference for FB, MODE, EN; must be star-connected to PGND at single point |
| E5 | FB | Feedback input for adjustable output; 20nA bias current enables high-value resistor dividers |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost mode transition | Seamless crossover when PVIN ≈ VOUT eliminates output glitches and ripple spikes |
| Ultra-low quiescent current | 35µA enables >100-hour battery standby in always-on mobile subsystems |
| Integrated 4-switch power stage | Eliminates need for external MOSFETs and gate drivers - reduces BOM count and layout area |
| Hiccup-mode overcurrent protection | 40ms off-time + soft-start recovery prevents thermal runaway during sustained overload |
| 2.5MHz fixed-frequency operation | Permits use of 1µH inductors <3.5mm² footprint and total solution size <25mm² |
Applications
| Smartphone System Rail | Tablet PMIC Sub-Regulator |
|---|---|
Use Scenario: Maintaining stable 3.3V system rail as single-cell Li-ion discharges from 4.35V to 2.5V. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying SoC I/O, display interface, and audio codec rails. Use Value: Prevents brownout resets by regulating continuously across input voltage crossing VOUT - no system-level voltage sag. |
Use Scenario: Generating adjustable 1.8V–3.3V auxiliary rail for camera ISP or USB PHY from shared battery bus. IC Role / Device Role / Timing Role: Programmable secondary regulator supporting dynamic voltage scaling and multiple peripheral standards. Use Value: Single IC replaces discrete LDO + boost solutions - cuts PCB area by 40% and improves efficiency >15% at light loads. |
| 2G/3G/4G RF Power Amplifier Bias | Wireless Communication Module |
Use Scenario: Delivering clean, ripple-free 3.3V bias to cellular PA during burst transmission with rapid load transients. IC Role / Device Role / Timing Role: High-dynamic-response buck-boost regulator placed adjacent to PA module. Use Value: 2.5MHz switching + 4.5A peak current handles 0→2A load steps in <10µs with <50mV undershoot - meets 3GPP PA linearity specs. |
Use Scenario: Powering Bluetooth/Wi-Fi SoC in portable IoT device with wide-input battery source (2.7–4.2V). IC Role / Device Role / Timing Role: Main system regulator managing sleep/wake cycles and RF transmit bursts. Use Value: PFM mode draws only 35µA during deep-sleep - extends coin-cell or small Li-po life to >1 year in sensor nodes. |
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-switch buck-boost, 2.2MHz, 3A continuous, 45µA IQ, fixed 3.3V/5V outputs only - no adjustable version | Requires redesign if adjustable VOUT needed; lacks MODE pin sync capability | Choose for cost-sensitive fixed-output designs where external sync is unnecessary |
| TPS63802DLAR | 4-switch buck-boost, 2.1MHz, 2A continuous, 17µA IQ, supports 1.8–5.5V adjustable output with 0.8V reference | Lower IQ but higher rDS(ON) (55mΩ/45mΩ) - reduced efficiency at 2A load | Prefer when ultra-low standby power dominates over full-load efficiency |
Compared with MP2918GQ-Z and TPS63802DLAR, the ISL91110IIAZ-T7A uniquely combines adjustable output, 2.5MHz operation, and 4.5A peak current in a 2.33mm × 2.07mm WLCSP - making it optimal for space-constrained, dynamically loaded mobile SoC rails requiring precise voltage programming.
Availability
ISL91110IIAZ-T7A is available at Aetrix Electronics and suitable for smartphone system rails, tablet PMIC subsystems, and wireless communication modules requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for ISL91110IIAZ-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 ICs, serving automotive, industrial, and consumer markets with high-reliability silicon solutions.
The ISL91110 product line was engineered specifically for advanced battery-powered mobile devices needing efficient, compact, and robust buck-boost regulation across the full Li-ion voltage range - targeting smartphones, tablets, and RF front-end modules.
FAQ
What output voltage range does the ISL91110IIAZ-T7A support?
The ISL91110IIAZ-T7A supports an adjustable output voltage range of 1.0V to 5.2V using an external resistor divider on the FB pin. Its internal feedback reference is precisely 0.800V ±1.7mV, enabling accurate programming - for example, R1 = 1MΩ and R2 = 324kΩ yields 3.3V output. Fixed-output variants (e.g., ISL91110IINZ-T7A) are not interchangeable with the ISL91110IIAZ-T7A due to different FB connectivity requirements.
Does the ISL91110IIAZ-T7A require external MOSFETs?
No, the ISL91110IIAZ-T7A integrates all four power switches (two PFETs and two NFETs) with typical rDS(ON) values of 40mΩ and 30mΩ respectively. It requires only an external inductor (1µH recommended), input capacitor (2×10µF), output capacitor (2×22µF), and FB resistor divider - no external gate drivers or discrete MOSFETs are needed for standard operation.
How does the ISL91110IIAZ-T7A handle input voltage crossing the output voltage?
The ISL91110IIAZ-T7A uses Intersil's proprietary control algorithm to automatically and seamlessly transition between buck and boost modes when PVIN approaches VOUT. This avoids output voltage discontinuities or ripple spikes - critical for maintaining stable SoC operation during battery discharge. The transition occurs without user intervention or external circuitry, and is validated across temperature and load conditions per Figure 12 in FN8434 Rev 4.00.
What is the thermal performance of the ISL91110IIAZ-T7A in its WLCSP package?
The ISL91110IIAZ-T7A in its 25-bump WLCSP package has a junction-to-board thermal resistance (θJB) of 13°C/W. It incorporates thermal shutdown at +155°C (typical) with 30°C hysteresis, resuming operation at +125°C after executing full soft-start. The small 2.33mm × 2.07mm footprint requires careful PCB copper pour design on the board side to maintain safe operating temperatures at 2A continuous load.
Can the ISL91110IIAZ-T7A synchronize to an external clock?
Yes, the MODE pin of the ISL91110IIAZ-T7A accepts an external synchronization signal within 2.75MHz to 3.25MHz - enabling EMI reduction through frequency dithering or alignment with system clocks. When MODE is pulled HIGH, the device operates in auto PFM mode; when LOW, it forces continuous PWM. External sync overrides both modes and locks the oscillator to the applied clock frequency.
ISL91110IIAZ-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.25V
- 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)
ISL91110IIAZ-T7A FAQ
1.How can I place an order for ISL91110IIAZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IIAZ-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 ISL91110IIAZ-T7A reliable?
The price and inventory of ISL91110IIAZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IIAZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91110IIAZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IIAZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IIAZ-T7A?
ISL91110IIAZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IIAZ-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 ISL91110IIAZ-T7A?
For technical support, including ISL91110IIAZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IIAZ-T7A requirements.
6.How does Aetrix verify that ISL91110IIAZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91110IIAZ-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 ISL91110IIAZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91110IIAZ-T7A?
All ISL91110IIAZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IIAZ-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 ISL91110IIAZ-T7A part is unused and in its original packaging.
Return procedure for ISL91110IIAZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL91110IIAZ-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…
