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Renesas ISL91107IIAZ-T
- Part No.:
- ISL91107IIAZ-T
- Manufacturer:
- Renesas
- Package:
- 15-UFBGA, WLCSP
- Datasheet:
-
ISL91107IIAZ-T.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 15WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,588
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Product details
Overview
ISL91107IIAZ-T from Renesas Electronics is a highly-integrated synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A output current with 1.8V–5.5V input range, 0.788–0.812V feedback reference, and 2.5MHz switching frequency. It operates in adjustable-output mode (1V–5.2V) and supports seamless automatic transitions between buck and boost modes for stable regulation across varying input conditions - ideal for battery-powered mobile power rails.
For engineers reviewing the ISL91107IIAZ-T datasheet, ISL91107IIAZ-T pinout, ISL91107IIAZ-T application, or ISL91107IIAZ-T equivalent, key selection criteria include its 45µA no-load quiescent current, WLCSP-15 package footprint (2.15mm × 1.51mm), integrated overcurrent/thermal/UVLO protection, and compatibility with single-inductor, low-external-component designs in space-constrained portable electronics.
Technical Context
The ISL91107IIAZ-T implements a fully synchronous 4-switch buck-boost topology with automatic mode transition logic that avoids output disturbance during VIN-to-VOUT crossover. Its PWM controller dynamically selects between buck (VIN > VOUT) and boost (VIN < VOUT) operation using internal gate drivers with anti-shoot-through protection and real-time current sensing on both high-side and low-side MOSFETs.
It features dual supply inputs (PVIN for power path, VIN for analog reference stability), separate PGND/GND pins to isolate high-switching-current paths from sensitive analog ground, and a programmable MODE pin to select auto PFM (light-load efficiency) or forced PWM (low-noise, fixed-frequency) operation - enabling optimized performance across dynamic load profiles in handheld devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (2.7–4.2V), Li-polymer, or multi-chemistry battery inputs without external pre-regulation. |
| Output Current | Up to 2A at PVIN = 2.8V, VOUT = 3.3V - sufficient for powering RF power amplifiers, application processors, or display bias rails. |
| Feedback Reference Voltage | 0.788V to 0.812V - enables precise output programming from 1V to 5.2V using external resistor divider with ±2% accuracy in PWM mode. |
| Switching Frequency | 2.25MHz to 2.75MHz (typ. 2.5MHz) - allows use of compact 1µH inductors and minimizes EMI filter size in high-density PCB layouts. |
| No-Load Quiescent Current | 45µA - maximizes battery runtime in standby/sleep states for always-on subsystems like sensors or PMIC sequencers. |
| Protection Features | Short-circuit, over-temperature (150°C shutdown), UVLO (1.75V rising threshold), and hiccup-mode overcurrent - ensures robust field reliability without external supervision circuitry. |
Pinout & Package
ISL91107IIAZ-T 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 rated MSL3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, A2 | PVIN | Primary power input (1.8V–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 separately to ensure stable VFB accuracy. |
| B1, B2 | LX1 | Inductor connection (input side); carries full switching current in buck mode and partial current in boost mode. |
| B3 | EN | Active-high enable control; drives LOW to enter shutdown (0.05µA ISD) with internal 35Ω soft-discharge path from VOUT to GND. |
| C1, C2 | PGND | Power ground for high di/dt switching currents; must be connected directly to input/output capacitor grounds via short, wide traces. |
| C3 | MODE | Selects operating mode: HIGH = auto PFM (efficiency-optimized), LOW = forced PWM (fixed-frequency, low-noise). |
| D1, D2 | LX2 | Inductor connection (output side); carries full switching current in boost mode and partial current in buck mode. |
| D3 | GND | Analog ground reference; isolated from PGND to prevent noise coupling into feedback and reference circuits. |
| E1, E2 | VOUT | Regulated output; requires 2×22µF X5R ceramic capacitors with low ESL/ESR for transient response and ripple suppression. |
| E3 | FB | Feedback input; connects to resistor divider network; requires guard ring and proximity to IC to minimize noise pickup. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Buck-Boost Mode Transition | Seamless crossover between buck and boost without output voltage glitch or control loop instability - critical for maintaining rail integrity during battery discharge. |
| 4-Switch Synchronous Architecture | Eliminates external diodes and reduces conduction losses; achieves up to 96% peak efficiency with integrated 45mΩ P-FET and 32mΩ N-FET switches. |
| Programmable Output Voltage | Supports 1V–5.2V via external resistor divider (R1/R2), enabling reuse across multiple system rails without redesigning power architecture. |
| Low-Noise Forced PWM Mode | Fixed 2.5MHz operation suppresses sub-harmonic interference in RF-sensitive applications such as cellular front-end modules or audio codecs. |
| Integrated Soft-Start & Soft-Discharge | 1ms EN-to-ramp delay and 35Ω internal discharge path prevent inrush current and output voltage hang-up during power cycling. |
Applications
| Smartphone Baseband Power | Tablet PC Display Bias |
|---|---|
Use Scenario: Regulating 3.3V or 5V bias for AMOLED display drivers while battery voltage drops from 4.2V to 3.0V. IC Role / Device Role / Timing Role: Buck-boost regulator providing constant output despite input voltage crossing VOUT threshold. Use Value: Eliminates need for dual-stage conversion (buck + boost), reducing BOM count by 2–3 components and saving >12mm² PCB area. | Use Scenario: Supplying adjustable 1.8V–5.2V rails to touch controller, backlight IC, or interface transceivers in tablets. IC Role / Device Role / Timing Role: Programmable output regulator supporting multiple subsystem voltage requirements from one compact solution. Use Value: Enables single-part inventory management across product variants, cutting procurement complexity and logistics overhead. |
| 2G/3G/4G RF Power Amplifier | Wireless Communication SoC Core Rail |
Use Scenario: Delivering 2A peak current to PA stages under burst transmission loads with rapid VIN variation. IC Role / Device Role / Timing Role: High-current buck-boost regulator with fast load-transient response (<100µs recovery) and hiccup-mode fault protection. Use Value: Maintains PA linearity and EVM compliance during deep battery sag, avoiding transmit power rollback or thermal throttling. | Use Scenario: Powering application processor cores requiring tight voltage tolerance (±2%) and low-noise operation during active compute cycles. IC Role / Device Role / Timing Role: Adjustable-output regulator operating in forced PWM mode to suppress switching noise near high-speed SerDes lanes. Use Value: Meets core rail noise specifications (<10mVpp) without additional LDO post-regulation, simplifying power tree design. |
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 | 3.0A output capability; 2.5V–5.5V input; fixed 3.3V/5.0V or adjustable versions; 2.4MHz switching frequency; 25µA IQ. | Higher current rating suits more demanding SoC rails; lower IQ benefits ultra-low-power wearables. | Choose TPS63020DSJR when >2A output or sub-25µA quiescent current is required - but verify layout compatibility with larger 2.5mm × 2.5mm SON package. |
| MAX77827AEWE+T | 2.5A output; 2.5V–5.5V input; 2.2MHz switching; 28µA IQ; integrated I2C interface for dynamic voltage scaling. | I2C programmability enables adaptive voltage scaling in application processors; lacks MODE pin for simple hardware-selectable PFM/PWM. | Prefer MAX77827AEWE+T where firmware-controlled rail tuning is needed - but note added software integration effort versus ISL91107IIAZ-T's pin-strapped simplicity. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the ISL91107IIAZ-T offers the smallest footprint (2.15mm × 1.51mm), lowest component count for basic adjustable designs, and proven seamless mode transition behavior in mobile battery-voltage crossover scenarios - making it optimal for cost- and space-sensitive consumer portable designs.
Availability
ISL91107IIAZ-T is available at Aetrix Electronics and suitable for smartphones, tablet PCs, and wireless communication devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL91107IIAZ-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 delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT markets.
The ISL91107 product line targets high-efficiency, ultra-compact DC/DC conversion in battery-powered portable electronics - emphasizing seamless buck-boost operation, minimal external component count, and robust protection for unattended operation.
FAQ
What output voltage range does the ISL91107IIAZ-T support?
The ISL91107IIAZ-T supports an adjustable output voltage range from 1V to 5.2V using an external resistor divider network connected to the FB pin. Its internal feedback reference is tightly specified at 0.788V to 0.812V, enabling accurate programming across this range. Fixed-output variants (e.g., ISL91107IINZ-T) are also available, but the ISL91107IIAZ-T itself is exclusively adjustable - confirmed in the Ordering Information table on page 3 of FN8584 Rev 3.00.
Does the ISL91107IIAZ-T require an external inductor, and what value is recommended?
Yes, the ISL91107IIAZ-T requires a single external inductor. A 1µH shielded ferrite inductor with ≥3.8A saturation current rating is recommended, as specified in the Applications Information section (page 10). This value balances efficiency, transient response, and physical size - and is validated in the Typical Application schematic (Figure 1) and Inductor Vendor Table (Table 1). Lower inductance increases ripple and peak current stress; higher inductance degrades transient performance.
How does the MODE pin affect ISL91107IIAZ-T operation?
The MODE pin on the ISL91107IIAZ-T selects between two operating modes: driving MODE HIGH enables auto PFM mode for maximum light-load efficiency (e.g., 45µA IQ), while driving MODE LOW forces continuous PWM operation at ~2.5MHz for predictable frequency and lower noise. This hardware-selectable mode eliminates firmware dependency and is distinct from I²C-programmable alternatives - a key differentiator confirmed in the Pin Descriptions (page 2) and Functional Description (page 9).
What protection features are integrated into the ISL91107IIAZ-T?
The ISL91107IIAZ-T integrates short-circuit protection (hiccup-mode overcurrent), thermal shutdown (150°C trip, 120°C hysteresis), input undervoltage lockout (1.75V rising threshold), and output voltage clamping (5.35V–5.85V). These protections operate autonomously without external components - verified in the Absolute Maximum Ratings (page 4), Analog Specifications (page 4–5), and Functional Description (pages 9–10) of FN8584 Rev 3.00.
Is the ISL91107IIAZ-T pin-compatible with other members of the ISL91107 family?
Yes, all ISL91107 variants - including ISL91107IIAZ-T and ISL91107IINZ-T - share identical 15-bump WLCSP packaging, pinout, and footprint (W3x5.15 drawing). The only functional difference is output configuration: ISL91107IIAZ-T is adjustable via FB, while ISL91107IINZ-T is fixed at 3.3V. This allows direct substitution in layouts designed for the family, provided external resistor divider or fixed-output capacitor network is updated accordingly.
ISL91107IIAZ-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:
- 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-T FAQ
1.How can I place an order for ISL91107IIAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91107IIAZ-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 ISL91107IIAZ-T reliable?
The price and inventory of ISL91107IIAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91107IIAZ-T is usually 5 days.
3.What payment methods are accepted for ISL91107IIAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91107IIAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91107IIAZ-T?
ISL91107IIAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91107IIAZ-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 ISL91107IIAZ-T?
For technical support, including ISL91107IIAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91107IIAZ-T requirements.
6.How does Aetrix verify that ISL91107IIAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91107IIAZ-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 ISL91107IIAZ-T meets industry standards.
7.What is the process for return or replacement of ISL91107IIAZ-T?
All ISL91107IIAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91107IIAZ-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 ISL91107IIAZ-T part is unused and in its original packaging.
Return procedure for ISL91107IIAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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