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Renesas ISL91107IINZ-T7A
- Part No.:
- ISL91107IINZ-T7A
- Manufacturer:
- Renesas
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
ISL91107IINZ-T7A.pdf
- Description:
- IC REG BUCK BST 3.3V 2A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:714
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Product details
Overview
ISL91107IINZ-T7A from Renesas Electronics is a fully synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A output current at 3.3V fixed output, operating across 1.8V–5.5V input range with 2.5MHz switching frequency and 45µA quiescent current. It enables compact power delivery in space-constrained mobile applications where input voltage may fall below or rise above the regulated output.
For engineers reviewing the ISL91107IINZ-T7A datasheet, ISL91107IINZ-T7A pinout, ISL91107IINZ-T7A application, or ISL91107IINZ-T7A equivalent, key selection criteria include seamless buck-boost mode transition, WLCSP package integration, light-load PFM efficiency, thermal shutdown behavior, and soft-discharge functionality during disable.
Technical Context
The ISL91107IINZ-T7A implements an automatic, disturbance-free transition between buck and boost topologies using internal PWM control logic and four integrated MOSFETs (P-channel rDSON = 45mΩ, N-channel rDSON = 32mΩ at 3.6V). Its 2.5MHz oscillator enables small external passive components while maintaining stable regulation under dynamic load steps up to 2A.
It features dual power inputs (PVIN for converter power, VIN for reference bias), separate PGND/GND paths to isolate high-switching-current return from analog ground, and programmable MODE pin control for forced PWM or auto PFM operation - critical for balancing efficiency versus ripple in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (PWM mode), enabling direct replacement of LDOs in noise-sensitive RF supply rails. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/battery stacks without pre-regulation. |
| Max Output Current | 2A at PVIN = 2.8V, VOUT = 3.3V - sufficient for powering baseband processors, PMIC subsystems, or RF power amplifiers. |
| Switching Frequency | 2.5MHz (±10%) - allows use of ≤1µH inductors and low-ESR ceramic capacitors, minimizing solution footprint. |
| Quiescent Current | 45µA in PFM no-load condition - extends battery runtime in always-on sensor or standby circuits. |
| Package | 15-bump WLCSP, 2.15mm × 1.51mm, 0.4mm pitch - compatible with fine-pitch mobile PCB assembly and ultra-thin form factors. |
| Protection Features | Short-circuit hiccup mode, thermal shutdown (150°C trip, 30°C hysteresis), UVLO (1.75V rising threshold), and reverse current blocking. |
Pinout & Package
ISL91107IINZ-T7A uses a 15-bump Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch, measuring 2.15mm × 1.51mm. The package is RoHS-compliant, Pb-free, and MSL3 rated per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | PVIN | Main power input for DC/DC converter stage; connects to 22µF bulk capacitor at PGND. |
| A3 | VIN | Bias supply for internal reference and control circuitry; must be within same 1.8V–5.5V range as PVIN. |
| B1, B2 | LX1 | Inductor connection on input side; carries high di/dt switching current in both buck and boost phases. |
| B3 | EN | Active-high enable input; drives LOW to enter shutdown (0.05µA ISD) with internal 35Ω VOUT-to-GND discharge path. |
| C1, C2 | PGND | Power ground return for LX1/LX2 switching currents; must be low-inductance, short-path connection to input/output caps. |
| C3 | MODE | Selects operating mode: HIGH = auto PFM/PWM transition, LOW = forced PWM (constant frequency, higher light-load IQ). |
| D1, D2 | LX2 | Inductor connection on output side; complements LX1 to complete 4-switch buck-boost topology. |
| D3 | GND | Analog ground reference for feedback amplifier and error comparator; isolated from PGND to prevent noise coupling. |
| E1, E2 | VOUT | Regulated buck-boost output; requires 2×22µF X5R ceramic capacitors at PGND for stability and transient response. |
| E3 | FB | Feedback input for adjustable versions; unused (NC) in ISL91107IINZ-T7A since output is factory-trimmed to 3.3V. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Buck-Boost Mode Transition | Zero-output-disturbance crossover when VIN crosses VOUT, eliminating need for external mode control logic or sequencing. |
| Ultra-Low Quiescent Current | 45µA in PFM no-load state - preserves battery capacity in IoT sensors and wearable devices with long idle periods. |
| Integrated Soft Discharge | 35Ω internal resistor between VOUT and GND upon EN deassertion - prevents floating output and simplifies system power-down sequencing. |
| High-Efficiency Synchronous Architecture | Up to 96% peak efficiency at 3.3V/1A with 2.5MHz switching - reduces thermal load and eliminates external Schottky diode. |
| Robust Protection Suite | Hiccup-mode overcurrent, thermal shutdown with 30°C hysteresis, and undervoltage lockout ensure reliable operation under fault conditions. |
Applications
| Smartphone Baseband Power | Tablet PC Core Logic Supply |
|---|---|
|
Use Scenario: Powers application processor I/O and memory interface rails where battery voltage varies from 4.4V (fully charged) to 2.8V (discharged). IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 3.3V from dynamically varying Li-ion source. Use Value: Eliminates need for separate buck and boost converters, reducing BOM count and PCB area by >40% vs discrete solutions. |
Use Scenario: Supplies 3.3V to display interface ICs and touch controller in thin-profile tablets with tight height constraints. IC Role / Device Role / Timing Role: Compact, high-frequency DC/DC regulator enabling minimal inductor height (<1.2mm) and low-profile decoupling. Use Value: 2.15mm × 1.51mm WLCSP footprint allows placement directly beneath processor BGA, minimizing trace inductance and improving PSRR. |
| 2G/3G/4G RF Power Amplifier Bias | Wireless Communication SoC Core Rail |
|
Use Scenario: Provides clean, ripple-controlled 3.3V bias to cellular PA modules requiring fast load transient response during TX bursts. IC Role / Device Role / Timing Role: High-bandwidth buck-boost regulator with <2ms soft-start and <100mV undershoot during 0→2A load steps. Use Value: 2.5MHz switching and integrated MOSFETs achieve <5µs response to load transients - meets 3GPP PA spectral mask requirements. |
Use Scenario: Powers wireless SoCs (e.g., Bluetooth/Wi-Fi combo chips) in earbuds and wearables where battery life and size are critical. IC Role / Device Role / Timing Role: Ultra-low-IQ buck-boost regulator supporting deep-sleep modes with sub-50µA system standby current. Use Value: 45µA quiescent current extends single-charge battery life to >7 days in always-connected BLE beacon applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918DJ-LF-Z | Fixed 3.3V output, 2A rating, 2.2MHz switching, but uses QFN-13 package (3mm × 4mm) - 4.5× larger footprint than ISL91107IINZ-T7A WLCSP. | Suitable for industrial or non-mobile designs where board space is less constrained and thermal mass aids heat dissipation. | Choose MP2918DJ-LF-Z if QFN handling is preferred over WLCSP reflow, or if higher thermal margin is required at full 2A load. |
| TPS63020DSJR | Adjustable/fixed 3.3V output, 3A capability, 2.4MHz switching, but 12-bump WLCSP (2.5mm × 2.5mm) - 2.3× larger area and no integrated soft-discharge. | Preferred for designs needing >2A output or tighter output accuracy (±1% vs ±2%), but lacks VOUT discharge path for controlled power-down. | Choose TPS63020DSJR only if higher current headroom or tighter VOUT tolerance is mandatory; otherwise, ISL91107IINZ-T7A offers superior size and integrated discharge. |
Compared with MP2918DJ-LF-Z and TPS63020DSJR, the ISL91107IINZ-T7A delivers identical 3.3V/2A performance in the smallest available footprint with unique soft-discharge functionality - making it optimal for ultra-compact, battery-sensitive mobile endpoints where layout area and controlled shutdown are design priorities.
Availability
ISL91107IINZ-T7A is available at Aetrix Electronics and suitable for smartphones, tablet PCs, and wireless communication devices requiring stable component supply, consistent WLCSP packaging, and guaranteed long-term production continuity.
Supply support for ISL91107IINZ-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 is a global semiconductor leader specializing in microcontrollers, analog power, and timing solutions for automotive, industrial, and consumer markets.
The ISL91107 product line was designed specifically for high-efficiency, ultra-compact buck-boost regulation in portable electronics - emphasizing minimal external component count, seamless mode transition, and robust protection in space- and power-constrained environments.
FAQ
What is the output voltage tolerance of the ISL91107IINZ-T7A under full load and temperature range?
The ISL91107IINZ-T7A provides a fixed 3.3V output with ±2% accuracy over the full –40°C to +85°C operating temperature range and 0–2A load, measured in PWM mode. This specification ensures compatibility with standard 3.3V I/O interfaces without requiring external trimming or calibration. The ISL91107IINZ-T7A achieves this via factory laser-trimming of internal feedback resistors, eliminating the need for external resistor networks.
Does the ISL91107IINZ-T7A require external compensation components?
No, the ISL91107IINZ-T7A integrates full internal compensation for its voltage-mode PWM controller. Only three external components are needed: one 1µH inductor and two 22µF ceramic output capacitors (plus one 22µF input capacitor). This eliminates loop compensation design effort and improves design repeatability. The ISL91107IINZ-T7A's internal compensation is optimized for the specified 2.5MHz switching frequency and recommended LC values.
How does the MODE pin affect efficiency and ripple performance in the ISL91107IINZ-T7A?
When MODE is pulled HIGH, the ISL91107IINZ-T7A operates in auto PFM/PWM mode - switching to PFM at light loads (<300mA) to reduce quiescent current to 45µA, maximizing battery life but increasing output voltage ripple. When MODE is pulled LOW, it forces continuous PWM operation, maintaining constant 2.5MHz frequency and lower ripple (<15mVpp) at the cost of higher light-load IQ (~60µA). The ISL91107IINZ-T7A's MODE pin thus enables direct trade-off tuning between efficiency and noise.
What is the maximum allowable input voltage for the ISL91107IINZ-T7A, and what happens beyond that limit?
The absolute maximum rating for PVIN and VIN pins of the ISL91107IINZ-T7A is 6.5V. Operation above 5.5V (recommended max) risks permanent damage due to gate oxide stress or junction overheating. The device includes no overvoltage protection - external clamping or input filtering must be added if transient surges exceeding 5.5V are possible. Exceeding 6.5V voids warranty and may cause immediate failure of the internal 4-switch FET array.
Can the ISL91107IINZ-T7A be used with ceramic capacitors only, or are electrolytic types required?
The ISL91107IINZ-T7A is designed exclusively for ceramic capacitors: 22µF X5R input cap and 2×22µF X5R output caps (10V rating). Electrolytic or tantalum capacitors are not recommended - their higher ESR and ESL degrade transient response, increase ripple, and risk instability. Ceramic capacitors also enable the 2.5MHz switching frequency; using non-ceramic types would force derating or failure to regulate. The ISL91107IINZ-T7A's control loop is characterized and validated only with low-ESR ceramic components.
ISL91107IINZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 15-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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-WLCSP (1.51x2.15)
ISL91107IINZ-T7A FAQ
1.How can I place an order for ISL91107IINZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91107IINZ-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 ISL91107IINZ-T7A reliable?
The price and inventory of ISL91107IINZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91107IINZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91107IINZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91107IINZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91107IINZ-T7A?
ISL91107IINZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91107IINZ-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 ISL91107IINZ-T7A?
For technical support, including ISL91107IINZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91107IINZ-T7A requirements.
6.How does Aetrix verify that ISL91107IINZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91107IINZ-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 ISL91107IINZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91107IINZ-T7A?
All ISL91107IINZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91107IINZ-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 ISL91107IINZ-T7A part is unused and in its original packaging.
Return procedure for ISL91107IINZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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