My Inquiry
My Account
Renesas ISL91110IIAZ-T
- Part No.:
- ISL91110IIAZ-T
- Manufacturer:
- Renesas
- Package:
- 25-UFBGA, WLCSP
- Datasheet:
-
ISL91110IIAZ-T.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 25WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,592
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL91110IIAZ-T from Renesas Electronics (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 supports adjustable output from 1.0V to 5.2V via external resistor divider - enabling brownout-free system voltage in space-constrained mobile power rails.
For engineers reviewing the ISL91110IIAZ-T datasheet, ISL91110IIAZ-T pinout, ISL91110IIAZ-T application, or ISL91110IIAZ-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 compatibility with low-ESR ceramic capacitors and 1µH shielded inductors in high-density smartphone and tablet PMIC subsystems.
Technical Context
The ISL91110IIAZ-T implements a proprietary 4-switch synchronous buck-boost topology with automatic mode arbitration: it operates as a buck converter when PVIN > VOUT and as a boost converter when PVIN < VOUT, with smooth transitions near VOUT ≈ PVIN. Its control loop uses an internal 0.8V reference and supports both PWM and PFM operation, with load-dependent mode switching thresholds (75mA PFM→PWM, 200mA PWM→PFM).
Internal protection includes undervoltage lockout (1.725V rising threshold), thermal shutdown at 155°C (30°C hysteresis), short-circuit hiccup mode triggered after 16 consecutive peak-current-limit cycles, and soft-discharge via 120Ω internal pull-down on VOUT during EN deassertion - all integrated without requiring external components.
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 (adjustable) - set via external resistor divider on FB pin |
| Continuous Output Current | 2A at VOUT = 3.3V, PVIN = 2.5V - sufficient for RF PA bias and core logic rails |
| Switching Frequency | 2.5MHz (typ) - enables use of compact 1µH inductor and small ceramic capacitors |
| Quiescent Current | 35µA in PFM mode - extends battery runtime in standby and light-load states |
| Thermal Resistance | θJB = 13°C/W - optimized for heat transfer through package bump to PCB |
| Protection Features | Short-circuit hiccup mode, overtemperature shutdown (155°C), UVLO, and soft-discharge |
Pinout & Package
ISL91110IIAZ-T 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 requires controlled reflow per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, B1–B4 | PVIN | Main power input (1.8V–5.5V); must connect dual 10µF X5R ceramics to PGND |
| C1–C3 | PGND | Power ground return path for high di/dt switching currents; separate from SGND |
| D1–D4 | LX2 | Output-side inductor node; connects to one end of 1µH inductor and VOUT capacitor bank |
| E1–E4 | VOUT | Regulated output; connects dual 22µF X5R ceramics to PGND and feedback network |
| C4 | MODE | Selects PFM (HIGH) or forced PWM (LOW); also accepts external sync clock (2.75–3.25MHz) |
| A5 | VIN | Analog supply input for internal reference and control circuitry; decoupled separately |
| B5 | EN | Active-HIGH enable; asserts internal startup sequence and disables soft-discharge when HIGH |
| C5, D5 | SGND | Analog ground reference for FB, MODE, EN; must be star-connected to minimize noise coupling |
| E5 | FB | Feedback input for adjustable output; senses 0.8V reference point via external resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Zero-output-voltage-ripple crossover at PVIN ≈ VOUT enables stable rail generation across full battery discharge |
| Low-light-load efficiency | 35µA IQ in PFM mode minimizes standby power loss in always-on mobile subsystems |
| Hiccup-mode overcurrent protection | Auto-retry shutdown (40ms off-time) prevents thermal runaway during sustained short-circuit events |
| Integrated soft-discharge | 120Ω internal VOUT-to-SGND discharge path eliminates need for external bleeder circuitry |
| Flexible output programming | FB pin with 20nA bias current allows high-value resistor dividers (e.g., 1MΩ/324kΩ for 3.3V), reducing divider power loss |
| High-frequency operation | 2.5MHz switching enables compact 1µH inductor and avoids AM radio band interference |
Applications
| Smartphone System Rail | Tablet Core Logic Supply |
|---|---|
|
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 delivering regulated VDD_SYS to AP/SoC and peripheral interfaces. Use Value: Eliminates brownout resets by sustaining output voltage even when battery drops below nominal system voltage. |
Use Scenario: Powering multi-core application processor I/O and memory interface rails under dynamic load. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter feeding downstream LDOs and POL modules. Use Value: 96% peak efficiency and 2.5MHz operation reduce thermal footprint and enable tight layout in thin-profile tablets. |
| 2G/3G/4G RF Power Amplifier Bias | Wireless Communication Module |
|
Use Scenario: Providing clean, ripple-free 3.3V–4.5V bias to cellular RF PAs during transmit bursts. IC Role / Device Role / Timing Role: Dedicated PA supply regulator with fast transient response and low output impedance. Use Value: Seamless buck-boost mode transition prevents PA gain collapse during battery sag under high-current TX events. |
Use Scenario: Consolidating multiple voltage rails (e.g., 1.8V, 3.3V) in compact IoT modems and NB-IoT transceivers. IC Role / Device Role / Timing Role: Programmable buck-boost source supporting configurable output via firmware-controlled resistor networks. Use Value: Adjustable 1.0V–5.2V output range simplifies BOM management across multiple module variants. |
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 | 3.5A peak current limit, 400kHz–2.5MHz programmable frequency, no hiccup mode | Higher peak current but lacks integrated soft-discharge and fixed 0.8V FB reference | Preferred for higher burst-current apps where external discharge control is acceptable |
| TPS63802DLAR | 2A continuous, 2.5MHz, 15µA IQ, but only supports 1.8V–5.5V input and 2.5V–5.5V output | Narrower output range (no 1.0V support); different FB reference (0.6V) | Selected when ultra-low IQ dominates design priority and 1.0V output is not required |
Compared with MP2918GQ-Z and TPS63802DLAR, the ISL91110IIAZ-T offers broader output programmability (1.0V–5.2V), integrated soft-discharge, and proven hiccup-mode reliability in mobile battery systems - making it optimal for space-constrained, brownout-sensitive applications where rail stability across full battery discharge is critical.
Availability
ISL91110IIAZ-T is available at Aetrix Electronics and suitable for smartphone system rails, tablet core logic supplies, 2G/3G/4G RF power amplifier bias, and wireless communication modules requiring stable component supply across extended temperature ranges (-40°C to +85°C) and long production lifecycles.
Supply support for ISL91110IIAZ-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
Renesas Electronics Corporation is a global leader in microcontrollers, analog power, and SoC solutions, formed through the acquisition of Intersil in 2017. Its power management portfolio emphasizes high-efficiency, small-footprint regulators for mobile and industrial applications.
The ISL91110 product line was developed specifically for advanced single-cell Li-ion battery systems requiring uninterrupted voltage regulation across the entire discharge curve - targeting smartphones, tablets, and portable RF devices where size, efficiency, and brownout immunity are critical.
FAQ
What output voltage range does the ISL91110IIAZ-T support?
The ISL91110IIAZ-T supports an adjustable output voltage range from 1.0V to 5.2V, set using an external resistor divider connected to the FB pin. Its internal 0.8V reference and 20nA FB bias current enable precise programming with high-value resistors - for example, R1 = 1MΩ and R2 = 324kΩ yield 3.3V output. Fixed-output variants (e.g., ISL91110IINZ-T) are separate part numbers.
How does the ISL91110IIAZ-T handle input voltage crossing the output voltage?
The ISL91110IIAZ-T uses a proprietary 4-switch synchronous architecture that automatically and seamlessly transitions between buck and boost modes as PVIN approaches or crosses VOUT. This eliminates output voltage ripple and discontinuity during battery discharge, maintaining regulation without external intervention - a key advantage over 2-switch or hybrid topologies.
What protection features are integrated into the ISL91110IIAZ-T?
The ISL91110IIAZ-T integrates undervoltage lockout (UVLO), thermal shutdown at 155°C (with 30°C hysteresis), short-circuit hiccup mode (40ms off-time after 16 consecutive current-limit cycles), and soft-discharge via a 120Ω internal VOUT-to-SGND path upon EN deassertion - all without requiring external components.
What is the recommended inductor and capacitor configuration for the ISL91110IIAZ-T?
Renesas recommends a 1µH shielded ferrite inductor rated for ≥4A saturation current and low DCR (e.g., Coilcraft XFL4020-102ME). Input capacitance requires two 10µF X5R ceramics placed close to PVIN/PGND pins; output requires two 22µF X5R ceramics tied to VOUT/PGND. A 56pF NPO feed-forward capacitor across R1 improves line/load regulation.
Does the ISL91110IIAZ-T support external clock synchronization?
Yes - the MODE pin of the ISL91110IIAZ-T accepts an external clock signal in the 2.75MHz to 3.25MHz range, enabling synchronization with other switching regulators to reduce beat-frequency noise and EMI in multi-rail systems. When not used for sync, MODE sets operating mode: HIGH enables auto PFM, LOW forces PWM.
ISL91110IIAZ-T 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-T FAQ
1.How can I place an order for ISL91110IIAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91110IIAZ-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 ISL91110IIAZ-T reliable?
The price and inventory of ISL91110IIAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91110IIAZ-T is usually 5 days.
3.What payment methods are accepted for ISL91110IIAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91110IIAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91110IIAZ-T?
ISL91110IIAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91110IIAZ-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 ISL91110IIAZ-T?
For technical support, including ISL91110IIAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91110IIAZ-T requirements.
6.How does Aetrix verify that ISL91110IIAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91110IIAZ-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 ISL91110IIAZ-T meets industry standards.
7.What is the process for return or replacement of ISL91110IIAZ-T?
All ISL91110IIAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91110IIAZ-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 ISL91110IIAZ-T part is unused and in its original packaging.
Return procedure for ISL91110IIAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL91110IIAZ-T 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…
