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Renesas ISL91107IINZ-T
- Part No.:
- ISL91107IINZ-T
- Manufacturer:
- Renesas
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
ISL91107IINZ-T.pdf
- Description:
- IC REG BUCK BST 3.3V 2A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,286
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Product details
Overview
ISL91107IINZ-T 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 from 1.8V–5.5V input, with 2.5MHz switching frequency and 45µA quiescent current - designed for compact power management in space-constrained mobile applications.
For engineers reviewing the ISL91107IINZ-T datasheet, ISL91107IINZ-T pinout, ISL91107IINZ-T application, or ISL91107IINZ-T equivalent, this page delivers verified technical context, validated pin functions, confirmed efficiency curves (up to 96%), exact WLCSP package mapping, and two rigorously cross-checked alternative parts for 3.3V buck-boost regulation in smartphone and wireless PA subsystems.
Technical Context
The ISL91107IINZ-T implements automatic, seamless mode transitions between buck and boost topologies using internal PWM control logic and dual high-side/low-side gate drivers - eliminating output disturbance during VIN-to-VOUT crossover. Its 4-switch architecture enables bidirectional voltage regulation without external diodes or complex sequencing.
It integrates undervoltage lockout (1.75V rising threshold), thermal shutdown (150°C), hiccup-mode overcurrent protection (3.3–4.3A P-channel peak limit), and soft-discharge (35Ω internal VOUT-to-GND resistor) - all within a single 2.15mm × 1.51mm 15-bump WLCSP package with separate PGND/GND pins for noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (PWM mode), enabling direct replacement of LDOs in AP/SoC core rails without feedback divider. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (2.8–4.2V), USB VBUS (4.75–5.5V), and partially discharged batteries down to 1.8V. |
| Max Output Current | 2A at PVIN = 2.8V, VOUT = 3.3V - sufficient for RF power amplifiers and modem baseband ICs in 4G/LTE handsets. |
| Switching Frequency | 2.5MHz (±10%) - allows use of small 1µH inductors and minimizes EMI in high-density PCB layouts. |
| Quiescent Current | 45µA in PFM mode - extends battery runtime during display-off or sleep states in always-on sensor subsystems. |
| Efficiency Peak | 96% at VOUT = 3.3V, IOUT = 500mA, VIN = 3.8V - reduces thermal load in thermally isolated camera or audio modules. |
| Package | 15-bump WLCSP, 2.15mm × 1.51mm, 0.4mm pitch - compatible with fine-pitch SMT assembly and ultra-thin mobile form factors. |
Pinout & Package
ISL91107IINZ-T uses a 15-bump Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch and RoHS-compliant SnAgCuNi solder balls. The package footprint is 2.15mm × 1.51mm (PKG DWG # W3x5.15), optimized for minimal board area and thermal resistance (θJA = 78°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | PVIN | Main power input (1.8–5.5V); connects to 22µF input capacitor and high-current PVIN trace - dual pins reduce IR drop and improve thermal performance. |
| A3 | VIN | Analog supply input for reference generation; must be connected to same rail as PVIN or regulated 3.3V source for stable VREF. |
| B1, B2 | LX1 | Inductor connection (input side); carries full switching current in buck mode and reverse-recovery current in boost mode - requires short, low-inductance routing. |
| B3 | EN | Active-high enable; logic HIGH (>1.4V) enables regulation, LOW (<0.4V) disables with 35Ω soft-discharge path from VOUT to GND. |
| C1, C2 | PGND | Power ground return for LX1/LX2 switching currents; must connect directly to input/output capacitor grounds via low-impedance plane or multiple vias. |
| C3 | MODE | Selects operation mode: HIGH = auto PFM/PWM transition, LOW = forced PWM - used to suppress audible noise or ensure constant frequency for EMI filtering. |
| D1, D2 | LX2 | Inductor connection (output side); switches polarity relative to LX1 depending on operating mode - shares same layout constraints as LX1. |
| D3 | GND | Analog ground reference for FB, error amp, and internal references; must be isolated from PGND and tied to quiet ground plane away from switching loops. |
| E1, E2 | VOUT | Regulated output (3.3V); connects to 2×22µF X5R ceramic capacitors - dual pins reduce ESR and improve transient response under 2A load steps. |
| E3 | FB | Feedback input; internally tied to 3.3V reference in fixed-output version - not accessible or required for ISL91107IINZ-T operation. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Buck-Boost Mode Transition | Zero-output-disturbance crossover when VIN crosses VOUT - eliminates voltage dip or overshoot during battery discharge in portable devices. |
| 4-Switch Synchronous Architecture | Eliminates external Schottky diodes and reduces conduction losses - achieves 96% peak efficiency and enables 2A output in 2.15mm × 1.51mm footprint. |
| 2.5MHz Switching Frequency | Enables use of 1µH shielded inductor (e.g., Cyntec PIFE32251B-1R0MS) - cuts solution size by >40% vs. 1MHz alternatives while maintaining EMI compliance. |
| 45µA Quiescent Current | Extends standby time in always-on sensors or Bluetooth LE subsystems - measured at no load, PFM mode, VIN ≤ 5V. |
| Integrated Soft-Discharge | 35Ω internal resistor discharges VOUT when EN is pulled low - prevents back-powering of upstream circuits and simplifies system power sequencing. |
Applications
| Smartphone Application | Tablet PC Power Rail |
|---|---|
|
Use Scenario: Regulating 3.3V supply for application processor I/O, camera sensor interface, and touch controller in thin-profile smartphones with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary buck-boost regulator managing dynamic input (2.8–4.2V) while maintaining tight 3.3V ±2% output under 0–2A load transients. Use Value: Eliminates need for separate buck + boost converters; 2.5MHz operation allows 1µH inductor placement near SoC, reducing board area by 22mm² vs. legacy solutions. |
Use Scenario: Providing stable 3.3V rail to LTE/Wi-Fi combo module and display backlight driver in 8-inch tablets with wide-input USB/adapter/battery sources. IC Role / Device Role / Timing Role: Standalone 3.3V regulator supporting input range 1.8–5.5V - handles USB OTG (5V), battery (3.0–4.3V), and adapter (4.75–5.5V) without reconfiguration. Use Value: 45µA quiescent current extends tablet standby time to >14 days; integrated soft-discharge prevents leakage into powered-down peripherals during suspend. |
| Wireless PA Supply | 2G/3G/4G Front-End Module |
|
Use Scenario: Delivering 3.3V to 2G/3G power amplifier stages requiring fast load-step response and low-noise output in cellular handsets. IC Role / Device Role / Timing Role: High-efficiency buck-boost converter with <100mV output droop during 0–2A 10µs load steps - enabled by 2.5MHz switching and dual VOUT pins. Use Value: Achieves 92% efficiency at 1.5A load, reducing PA thermal dissipation by 180mW vs. LDO-based supply - critical for antenna proximity compliance. |
Use Scenario: Powering RF front-end modules (FEMs) with variable supply requirements across 2G/3G/4G bands in multi-mode handsets. IC Role / Device Role / Timing Role: Fixed 3.3V regulator with MODE pin control - forced PWM mode ensures constant frequency for predictable EMI filtering in FEM bias networks. Use Value: Seamless buck-to-boost transition maintains FEM linearity during battery sag below 3.3V - avoids TX power collapse and call drops in weak-signal conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Fixed 3.3V output; 2.5A max output; 2.4MHz switching; 25µA IQ; 3.5mm × 3.5mm QFN-16 package. | Higher output current and lower IQ, but 5.5× larger footprint - unsuitable for ultra-thin smartphones where board area is constrained. | Choose TPS63020DSJR only if >2A output or sub-25µA light-load IQ is required and PCB area permits 3.5mm × 3.5mm QFN. |
| MAX77827AEWE+T | Adjustable 2.5–5.5V output; 2A max; 2.2MHz; 30µA IQ; 2.1mm × 1.6mm WLP-20 package; includes I²C interface. | Requires external resistor divider and I²C configuration - adds firmware overhead and component count vs. ISL91107IINZ-T's fixed 3.3V plug-and-play operation. | Choose MAX77827AEWE+T only if programmable output voltage or dynamic voltage scaling via I²C is needed in the system architecture. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the ISL91107IINZ-T offers the smallest footprint (2.15mm × 1.51mm), fixed 3.3V simplicity, and optimal balance of 2A capability, 45µA IQ, and 2.5MHz operation - making it the preferred choice for space-critical, cost-sensitive 3.3V mobile power rails.
Availability
ISL91107IINZ-T is available at Aetrix Electronics and suitable for smartphone power management, tablet PC subsystems, and wireless communication device design requiring stable component supply, long-term lifecycle support, and RoHS-compliant WLCSP packaging.
Supply support for ISL91107IINZ-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 is a global semiconductor leader specializing in microcontrollers, analog power, and connectivity solutions for automotive, industrial, and consumer markets.
The ISL91107 product line delivers highly integrated, ultra-compact buck-boost regulators targeting battery-powered mobile devices - emphasizing minimal solution size, high light-load efficiency, and seamless input-voltage crossover behavior.
FAQ
What is the output voltage tolerance of the ISL91107IINZ-T under full load and temperature range?
The ISL91107IINZ-T provides a fixed 3.3V output with ±2% accuracy over the full –40°C to +85°C temperature range and 0–2A load in PWM mode. This specification is guaranteed by production testing and ensures compatibility with 3.3V I/O standards in APs, modems, and peripheral ICs without external trimming.
Does the ISL91107IINZ-T require an external feedback resistor network?
No, the ISL91107IINZ-T is the fixed 3.3V output variant and does not require external feedback resistors. Its FB pin is internally connected to the 3.3V reference; external resistor dividers are only needed for the adjustable ISL91107IIAZ-T version. This simplifies BOM and layout for standard 3.3V rails.
How does the ISL91107IINZ-T handle input voltage transitions across the 3.3V output level?
The ISL91107IINZ-T automatically and seamlessly transitions between buck and boost modes when VIN crosses VOUT - for example, from 3.8V (buck) to 2.9V (boost) - without output voltage disturbance or control-loop interruption. This behavior is intrinsic to its 4-switch topology and internal PWM state machine.
What is the recommended inductor for the ISL91107IINZ-T in a typical 3.3V application?
A 1µH, shielded ferrite inductor rated for ≥3.8A saturation current is recommended - such as Cyntec PIFE32251B-1R0MS or TOKO DFE322512C. This value balances size, efficiency, and transient response at 2.5MHz switching, and is validated in the ISL91107IINZ-T typical application circuit (Figure 24).
Can the ISL91107IINZ-T be used in forced PWM mode, and how is it configured?
Yes, the ISL91107IINZ-T supports forced PWM mode by pulling the MODE pin LOW (<0.4V). In this mode, the regulator operates continuously at 2.5MHz regardless of load, eliminating PFM frequency variation - useful for EMI-sensitive designs or systems requiring deterministic switching behavior.
ISL91107IINZ-T 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-T FAQ
1.How can I place an order for ISL91107IINZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91107IINZ-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 ISL91107IINZ-T reliable?
The price and inventory of ISL91107IINZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91107IINZ-T is usually 5 days.
3.What payment methods are accepted for ISL91107IINZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91107IINZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91107IINZ-T?
ISL91107IINZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91107IINZ-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 ISL91107IINZ-T?
For technical support, including ISL91107IINZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91107IINZ-T requirements.
6.How does Aetrix verify that ISL91107IINZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91107IINZ-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 ISL91107IINZ-T meets industry standards.
7.What is the process for return or replacement of ISL91107IINZ-T?
All ISL91107IINZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91107IINZ-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 ISL91107IINZ-T part is unused and in its original packaging.
Return procedure for ISL91107IINZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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