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Renesas ISL91107IIAZ-T7A
- Part No.:
- ISL91107IIAZ-T7A
- Manufacturer:
- Renesas
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
ISL91107IIAZ-T7A.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
ISL91107IIAZ-T7A from Renesas Electronics is a fully synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A output current (at PVIN = 2.8V, VOUT = 3.3V), operating across 1.8V–5.5V input range with 2.5MHz switching frequency and 45µA no-load quiescent current. It supports adjustable output voltages from 1V to 5.2V via external resistor divider and enables seamless automatic transitions between buck and boost modes - critical for battery-powered mobile power rails.
For engineers reviewing the ISL91107IIAZ-T7A datasheet, ISL91107IIAZ-T7A pinout, ISL91107IIAZ-T7A application, or ISL91107IIAZ-T7A equivalent, this device is selected for compact, high-efficiency power conversion where input voltage may dip below or rise above regulated output - especially in smartphones, wireless transceivers, and multi-rail portable systems requiring minimal external components and ultra-low light-load power loss.
Technical Context
The ISL91107IIAZ-T7A implements a true 4-switch buck-boost topology with integrated P-channel (45mΩ) and N-channel (32mΩ) MOSFETs, enabling continuous conduction mode operation across full VIN–VOUT crossover. Its PWM controller dynamically selects buck or boost phase based on real-time VIN/VOUT ratio, avoiding discontinuous-mode instability or output disturbance during mode transitions.
It features dual supply inputs (PVIN for power path, VIN for analog reference), separate PGND/GND pins to isolate high di/dt switching currents from sensitive analog circuitry, and programmable MODE pin control for forced PWM or auto PFM operation - directly impacting efficiency vs. noise trade-offs in RF-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 4-switch synchronous buck-boost - enables regulation when VIN < VOUT or VIN > VOUT without external reconfiguration |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (2.7–4.2V), Li-poly, or USB-powered systems with wide dynamic headroom |
| Max Output Current | 2A at PVIN = 2.8V, VOUT = 3.3V - sufficient for APUs, PMIC sub-rails, or RF power amplifier biasing |
| Switching Frequency | 2.5MHz (±10%) - allows use of small 1µH inductors and ceramic capacitors, minimizing solution footprint |
| Quiescent Current | 45µA in PFM mode - extends battery runtime in standby/sleep states without sacrificing startup responsiveness |
| Output Voltage Range | 1.0V to 5.2V (adjustable) - configured via external resistor divider; FB reference = 0.8V ±2.5% |
| Protection Features | Short-circuit (hiccup mode), over-temperature (150°C shutdown, 30°C hysteresis), UVLO (1.75V rising threshold) |
Pinout & Package
ISL91107IIAZ-T7A uses a 15-bump WLCSP package measuring 2.15mm × 1.51mm with 0.4mm pitch, RoHS-compliant and MSL3 rated. The package integrates thermal pad via solder bumps and requires controlled reflow per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | PVIN | Main power input (1.8–5.5V); connects to 22µF input capacitor and high-current PGND return path |
| A3 | VIN | Analog supply input for internal reference generation; must be decoupled independently from PVIN |
| B1, B2 | LX1 | Inductor connection (input-side switch node); carries full switching current in both buck and boost phases |
| B3 | EN | Active-high enable; logic-compatible (VIH ≥1.4V); pulls internal circuitry into low-IQ shutdown when LOW |
| C1, C2 | PGND | Power ground for LX1/LX2 switching paths; must be connected to low-impedance copper pour under IC |
| C3 | MODE | Selects operating mode: HIGH = auto PFM/PWM transition, LOW = forced PWM (constant frequency, higher light-load IQ) |
| D1, D2 | LX2 | Inductor connection (output-side switch node); complements LX1 to complete 4-switch conduction path |
| D3 | GND | Analog ground reference for FB, error amp, and internal references; isolated from PGND to prevent noise coupling |
| E1, E2 | VOUT | Regulated output; connects to 2×22µF X5R ceramic output capacitors for low ripple and transient response |
| E3 | FB | Feedback input; senses output via resistor divider (R1/R2); 0.8V reference enables precise VOUT programming |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Buck/Boost Mode Transition | Zero-output-disturbance crossover ensures stable rail during battery discharge or line transients without external control logic |
| 2.5MHz Fixed Switching Frequency | Enables <2mm² total solution size using 1µH inductor and 0603-case ceramics - ideal for space-constrained mobile PCBs |
| 45µA Quiescent Current (PFM) | Reduces no-load power loss by >50% vs. typical 100–150µA buck converters, extending standby time in always-on subsystems |
| Integrated 3.3A Peak Current Limit | Provides robust short-circuit protection with hiccup-mode recovery - avoids thermal runaway during load faults |
| Soft Discharge on Disable | 35Ω internal VOUT-to-GND discharge path clears residual charge rapidly, preventing floating outputs or latch-up in sequenced systems |
Applications
| Smartphone Baseband Power | 4G LTE Power Amplifier Bias |
|---|---|
|
Use Scenario: Supplying 3.3V rail to application processor I/O or modem baseband while battery voltage drops from 4.2V to 3.0V during discharge. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining constant VOUT despite VIN crossing VOUT threshold - eliminates need for dual-regulator sequencing. Use Value: Prevents brownout resets and maintains RF link integrity during deep battery discharge without increasing BOM count or board area. |
Use Scenario: Delivering stable 3.3V or 4.5V bias to 4G LTE PA stages where input varies with battery state and load current surges exceed 1.5A. IC Role / Device Role / Timing Role: High-current, fast-transient buck-boost regulator with 2.5MHz switching and integrated soft-start to suppress PA turn-on glitches. Use Value: Enables clean PA enable timing and reduces conducted EMI vs. lower-frequency alternatives - critical for TRP/TIS compliance. |
| USB-C PD Sink Rail | Wearable Sensor Hub Supply |
|
Use Scenario: Generating 3.3V or adjustable 1.8V/2.8V rails from variable USB-C PD input (3.0–5.5V) in portable accessories. IC Role / Device Role / Timing Role: Single-inductor buck-boost converter supporting wide-input USB-C negotiation without discrete LDO post-regulation. Use Value: Eliminates need for pre-regulator + LDO cascade, reducing heat, cost, and footprint while maintaining ±2% output accuracy across full input range. |
Use Scenario: Powering ultra-low-power sensor fusion hubs (accelerometer, gyro, BLE SoC) with intermittent 2A peak loads and long sleep intervals. IC Role / Device Role / Timing Role: Adjustable-output buck-boost regulator operating in PFM mode during sleep (<100µA system IQ) and PWM during active sensing. Use Value: Achieves >90% efficiency at 10mA load and <45µA quiescent draw - directly extending coin-cell or thin-film battery life by weeks. |
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 (Monolithic Power) | Fixed 3.3V output only; 2.2MHz switching; 50µA IQ; 1.8–5.5V input; 2A max | Lacks adjustable output and MODE pin control - unsuitable for multi-voltage systems requiring VOUT reconfiguration | Choose MP2918GQ-Z only if fixed 3.3V output suffices and PFM/PWM selection is unnecessary |
| TPS63020DSJR (Texas Instruments) | 2A max; 2.5MHz; 30µA IQ; 1.8–5.5V input; adjustable 1.2–5.5V output; requires external compensation | Higher light-load efficiency but needs external loop compensation components - increases design complexity and layout sensitivity | Prefer TPS63020DSJR when absolute lowest IQ is critical and design team has expertise in compensating current-mode buck-boost controllers |
Compared with MP2918GQ-Z and TPS63020DSJR, the ISL91107IIAZ-T7A uniquely combines adjustable output, MODE-selectable PFM/PWM, and zero-compensation design in a 2.15mm × 1.51mm WLCSP - offering optimal balance of flexibility, simplicity, and miniaturization for high-volume portable electronics.
Availability
ISL91107IIAZ-T7A is available at Aetrix Electronics and suitable for smartphones, wireless communication devices, and 2G/3G/4G power amplifiers requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for ISL91107IIAZ-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 connectivity solutions for automotive, industrial, and consumer markets.
The ISL91107 product line was designed specifically for high-density, battery-operated portable electronics demanding efficient wide-input-range DC/DC conversion with minimal external components and robust protection.
FAQ
What output voltage does ISL91107IIAZ-T7A support?
The ISL91107IIAZ-T7A is the adjustable-output variant of the ISL91107 family, supporting output voltages from 1.0V to 5.2V via an external resistor divider connected to the FB pin. Its internal feedback reference is 0.8V ±2.5%, and the datasheet provides Equation 1 for calculating R1/R2 values. Unlike the fixed 3.3V ISL91107IINZ-T7A, the ISL91107IIAZ-T7A offers full programmability for multi-rail systems.
Does ISL91107IIAZ-T7A require external compensation components?
No, the ISL91107IIAZ-T7A uses an internally compensated current-mode control architecture and requires no external compensation network. This simplifies design, reduces BOM count, and improves layout robustness - particularly beneficial for high-frequency (2.5MHz) operation where compensation sensitivity increases. Only three passive components (inductor, input cap, output cap) plus optional feedback resistors are needed for full functionality.
How does ISL91107IIAZ-T7A handle input voltage crossing the output voltage?
The ISL91107IIAZ-T7A automatically and seamlessly transitions between buck and boost modes when VIN approaches or crosses VOUT, with no output disturbance or control-loop interruption. Its 4-switch topology and dedicated PWM controller ensure continuous regulation - verified in Figure 23 and functional description - making it ideal for battery-powered systems where VIN drifts across the regulated rail during discharge or charging cycles.
What is the thermal performance of ISL91107IIAZ-T7A in its WLCSP package?
The ISL91107IIAZ-T7A in 15-bump WLCSP has θJA = 78°C/W and θJB = 20°C/W (typical). It incorporates thermal shutdown at +150°C (with 30°C hysteresis) and resumes operation at +120°C after soft-start. The small 2.15mm × 1.51mm footprint relies on proper PCB copper pour under PGND and thermal vias to GND planes for effective heat dissipation - especially critical at 2A continuous load near temperature limits.
Can ISL91107IIAZ-T7A operate with only one input supply instead of separate PVIN and VIN?
Yes - though PVIN and VIN serve distinct functions (PVIN powers the power switches, VIN supplies the analog reference), the ISL91107IIAZ-T7A allows both pins to be tied together to a common 1.8–5.5V source if necessary. However, separating them improves reference stability and PSRR, especially under high di/dt load transients. The datasheet Figure 24 shows PVIN = VIN in typical application, confirming functional compatibility with single-supply operation.
ISL91107IIAZ-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 5.2V
- 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)
ISL91107IIAZ-T7A FAQ
1.How can I place an order for ISL91107IIAZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91107IIAZ-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 ISL91107IIAZ-T7A reliable?
The price and inventory of ISL91107IIAZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91107IIAZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91107IIAZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91107IIAZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91107IIAZ-T7A?
ISL91107IIAZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91107IIAZ-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 ISL91107IIAZ-T7A?
For technical support, including ISL91107IIAZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91107IIAZ-T7A requirements.
6.How does Aetrix verify that ISL91107IIAZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91107IIAZ-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 ISL91107IIAZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91107IIAZ-T7A?
All ISL91107IIAZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91107IIAZ-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 ISL91107IIAZ-T7A part is unused and in its original packaging.
Return procedure for ISL91107IIAZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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