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Renesas ISL91107IRTAZ-T7A
- Part No.:
- ISL91107IRTAZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
ISL91107IRTAZ-T7A.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
ISL91107IRTAZ-T7A from Renesas (formerly Intersil) is a fully synchronous 4-switch buck-boost DC/DC regulator IC designed for single-inductor, wide-input voltage power conversion in space-constrained portable systems. It delivers up to 2A output current at 3.3V with 1.8V–5.5V input, achieves 96% peak efficiency, and features automatic seamless buck/boost mode transition without output disturbance. It supports adjustable output (1V–5.2V) via external resistor divider and operates at 2.5MHz switching frequency.
For engineers reviewing the ISL91107IRTAZ-T7A datasheet, ISL91107IRTAZ-T7A pinout, ISL91107IRTAZ-T7A application, or ISL91107IRTAZ-T7A equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world application mappings, and two rigorously cross-checked alternative parts for adjustable-output buck-boost regulation in battery-powered mobile and optical modules.
Technical Context
The ISL91107IRTAZ-T7A implements a true 4-switch synchronous buck-boost topology with integrated P-channel and N-channel MOSFETs (rDSON = 55mΩ / 47mΩ at 3.6V), enabling continuous conduction across input voltages both above and below VOUT. Its PWM controller dynamically selects buck or boost operation based on real-time VIN–VOUT relationship, supported by dedicated LX1/LX2 inductor terminals and separate PVIN/VIN supply rails for stable reference generation.
It integrates soft-start (1–3ms depending on mode), soft-discharge (35Ω internal VOUT-to-SGND path), undervoltage lockout (1.75V rising threshold), thermal shutdown (150°C trip, 30°C hysteresis), and overcurrent protection via FB monitoring. Mode selection (PFM auto or forced PWM) and enable control are implemented through logic-level digital inputs with defined VIH/VIL thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-poly, and USB-powered systems without pre-regulation. |
| Output Current | Up to 2A at VOUT=3.3V, PVIN=2.8V - sufficient for core logic, RF transceivers, and optical drivers in compact devices. |
| Switching Frequency | 2.5MHz (±10%) - enables use of small 1µH inductors and low-ESR ceramic capacitors, minimizing solution footprint. |
| Quiescent Current | 45µA in PFM no-load - extends battery runtime in standby and low-duty-cycle applications. |
| Feedback Reference | 0.8V ±1.25% - sets precise output voltage via external resistor divider; supports 1V–5.2V adjustment range. |
| Peak Efficiency | 96% at VOUT=3.3V, IOUT=1A - achieved via synchronous rectification and low RDS(on) integrated switches. |
| Protection Features | Short-circuit, over-temperature (150°C), UVLO, and reverse-current blocking - ensures robust operation under fault conditions. |
Pinout & Package
ISL91107IRTAZ-T7A is housed in a 3mm × 4mm, 20-lead TQFN package (RoHS-compliant, JEDEC MO-220VEGD-NJI, pkg drawing L20.3x4A) with exposed thermal pad connected to PGND for enhanced thermal performance (θJA = 41°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 7–10) | Power input rail | Supplies high-current switching path; requires 22µF ceramic capacitor to PGND; rated 1.8V–5.5V, absolute max 6.5V. |
| VIN (Pin 12) | Analog supply input | Provides stable bias for internal reference and control circuitry; shares same voltage range as PVIN but isolated ground path. |
| LX1 (Pins 5–6) | Inductor connection (input side) | Connects to one end of single external inductor; carries high di/dt switching current in both buck and boost phases. |
| LX2 (Pins 1–2) | Inductor connection (output side) | Connects to opposite end of inductor; completes 4-switch buck-boost power loop with LX1, PVIN, and VOUT. |
| VOUT (Pins 17–20) | Regulated output terminal | Delivers final regulated voltage; requires 2×22µF ceramic output capacitance; includes internal 5.35–5.85V overvoltage clamp. |
| FB (Pin 16) | Feedback input | Monitors divided output voltage; compares to 0.8V internal reference to regulate VOUT; sensitive to noise-requires SGND guard ring. |
| EN (Pin 13) | Enable control | Active-high logic input; drives HIGH ≥1.4V to enable, LOW ≤0.4V to enter shutdown (0.05µA ISD). |
| MODE (Pin 14) | Operating mode select | HIGH = auto PFM/PWM transition; LOW = forced PWM; prevents idle-mode instability in noise-sensitive systems. |
| PGND (Pins 3–4) | Power ground | High-current return path for switching nodes (LX1/LX2/VOUT); must be low-impedance copper plane tied to thermal pad. |
| SGND (Pin 15) | Analog ground | Low-noise reference for FB, reference, and control circuits; must be isolated from PGND except at single-point tie. |
| EPAD | Thermal pad | Exposed metal pad on underside; must be soldered to solid PGND plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost mode transition | Seamless switching between topologies without output voltage glitch or control-loop interruption during VIN drift across VOUT. |
| Single-inductor architecture | Reduces BOM count and PCB area vs. dual-inductor solutions; eliminates coupling and mismatch issues inherent in transformer-based topologies. |
| 2.5MHz fixed-frequency PWM | Enables use of sub-2mm height, 1µH shielded inductors (e.g., Cyntec PIFE32251B-1R0MS) and 0603-case ceramics for ultra-compact designs. |
| 45µA quiescent current | Minimizes no-load power loss in always-on subsystems such as RTC, sensors, or wake-on-LAN circuits in portable equipment. |
| Integrated soft-discharge | 35Ω internal switch discharges VOUT safely on disable, preventing back-powering of upstream sources or latch-up in multi-rail systems. |
Applications
| Smartphone Power Management | Optical Transceiver Module |
|---|---|
Use Scenario: Regulating system voltage from declining single-cell Li-ion battery (3.0–4.2V) to stable 3.3V for baseband processor and memory interface. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing uninterrupted power during battery discharge curve crossing VOUT. Use Value: Eliminates need for separate buck + boost converters; maintains >90% efficiency across full battery range without firmware intervention. | Use Scenario: Supplying 3.3V or 5V to SFP+ or QSFP optical modules where input varies between USB 5V, PoE-derived 3.3V, or backup battery. IC Role / Device Role / Timing Role: Wide-input DC/DC converter enabling plug-and-play compatibility across multiple host platforms and power sources. Use Value: Supports hot-swap insertion with controlled soft-start and fast transient response (<100µs recovery from 0→1A load step). |
| Tablet PC Display Backlight Driver | Wireless Baseband SoC Core Supply |
Use Scenario: Generating adjustable 4.5–5.2V for white LED strings from shared 3.7V battery rail in thin-profile tablets. IC Role / Device Role / Timing Role: Adjustable-output buck-boost regulator interfaced with I²C DAC or resistor network for brightness control. Use Value: Delivers 2A peak current with <±2% line/load regulation, enabling uniform LED intensity across varying battery SOC. | Use Scenario: Providing tightly regulated 1.2V core voltage to application processor under dynamic DVFS load (0–2A, 100kHz transients). IC Role / Device Role / Timing Role: High-efficiency, low-noise point-of-load regulator with forced-PWM mode for deterministic timing margins. Use Value: Achieves <15mV output ripple in PWM mode and <200µV RMS noise, meeting SoC core voltage tolerance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck-boost regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z (Monolithic Power Systems) | 4-switch architecture, 2.2MHz switching, 0.8V reference, 2.5A max IOUT; lacks integrated soft-discharge and has higher 75µA IQ. | Requires external discharge FET for safe shutdown; better suited for higher-current apps where 2.5A headroom is needed. | Select MP2918GQ-Z when output current demand exceeds 2A or when board layout allows discrete discharge circuit. |
| TPS63802DLVR (Texas Instruments) | 4-switch buck-boost, 2.5MHz, 0.8V reference, 2A max IOUT; includes I²C programmability and power-good flag; IQ = 25µA. | Offers digital configuration and status reporting; adds complexity but enables dynamic voltage scaling and telemetry. | Select TPS63802DLVR when system-level control, telemetry, or programmable VOUT sequencing is required. |
Compared with ISL91107IRTAZ-T7A, MP2918GQ-Z trades lower light-load efficiency for higher current capability, while TPS63802DLVR adds digital configurability at the cost of increased BOM and firmware dependency-making ISL91107IRTAZ-T7A optimal for analog-simple, cost-sensitive, and size-constrained designs requiring proven analog stability.
Availability
ISL91107IRTAZ-T7A is available at Aetrix Electronics and suitable for smartphone power management, optical transceiver modules, tablet display backlight drivers, and wireless baseband SoC core supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL91107IRTAZ-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 Corporation (acquired Intersil in 2017) is a global semiconductor leader specializing in microcontrollers, analog power management, and mixed-signal solutions for automotive, industrial, and infrastructure markets.
The ISL91107IRTAZ-T7A belongs to Renesas' high-efficiency DC/DC regulator product line, engineered specifically for battery-powered portable electronics requiring wide-input, single-inductor buck-boost conversion with minimal external components and industry-leading light-load efficiency.
FAQ
What is the recommended inductor value and saturation current rating for ISL91107IRTAZ-T7A?
The ISL91107IRTAZ-T7A datasheet specifies a 1µH inductor with ≥4.1A saturation current rating. Recommended part numbers include Cyntec PIFE32251B-1R0MS and TOKO DFE322512C. The inductor must use high-frequency ferrite core material, exhibit low DCR, and remain unsaturated under peak switch currents. ISL91107IRTAZ-T7A's 4.1A internal switch rating directly informs this requirement to avoid cycle-by-cycle current limiting.
Does ISL91107IRTAZ-T7A support fixed-output voltage configurations?
No-ISL91107IRTAZ-T7A is the adjustable-output variant (marked "107A") with 0.8V feedback reference. Fixed-output versions exist (e.g., ISL91107IRTNZ for 3.3V), but ISL91107IRTAZ-T7A requires an external resistor divider to set VOUT between 1V and 5.2V. Equation 1 in the datasheet defines R1/R2 selection: VOUT = 0.8V × (1 + R1/R2).
How does the MODE pin affect efficiency and noise performance of ISL91107IRTAZ-T7A?
When MODE = LOW, ISL91107IRTAZ-T7A operates in forced PWM mode-maintaining constant 2.5MHz switching regardless of load. This improves output voltage accuracy and reduces low-frequency noise but increases light-load losses. When MODE = HIGH, it enters auto PFM mode, skipping pulses at light loads to achieve 45µA quiescent current and higher partial-load efficiency at the expense of slightly higher output ripple.
What is the function of the separate PVIN and VIN pins on ISL91107IRTAZ-T7A?
PVIN supplies power to the high-current switching stage (MOSFETs, gate drivers, LX paths), while VIN powers the analog control circuitry (reference, error amplifier, oscillator). Separating these rails prevents switching noise from modulating the reference voltage and ensures stable regulation. Both accept 1.8V–5.5V, but VIN must be present for proper startup and regulation-PVIN alone is insufficient.
Can ISL91107IRTAZ-T7A be used in automotive applications?
ISL91107IRTAZ-T7A is specified for –40°C to +85°C operation and meets industrial reliability standards, but it is not AEC-Q200 qualified or rated for automotive under-hood environments. Its thermal shutdown (150°C) and UVLO (1.75V) thresholds align with extended temperature needs, yet Renesas does not certify this variant for automotive use. For automotive-grade buck-boost, consult Renesas' ISL78213 or similar AEC-Q100-compliant parts.
ISL91107IRTAZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (3x4)
ISL91107IRTAZ-T7A FAQ
1.How can I place an order for ISL91107IRTAZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91107IRTAZ-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 ISL91107IRTAZ-T7A reliable?
The price and inventory of ISL91107IRTAZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91107IRTAZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91107IRTAZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91107IRTAZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91107IRTAZ-T7A?
ISL91107IRTAZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91107IRTAZ-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 ISL91107IRTAZ-T7A?
For technical support, including ISL91107IRTAZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91107IRTAZ-T7A requirements.
6.How does Aetrix verify that ISL91107IRTAZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91107IRTAZ-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 ISL91107IRTAZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91107IRTAZ-T7A?
All ISL91107IRTAZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91107IRTAZ-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 ISL91107IRTAZ-T7A part is unused and in its original packaging.
Return procedure for ISL91107IRTAZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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