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Renesas ISL91127IINZ-T7A
- Part No.:
- ISL91127IINZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
ISL91127IINZ-T7A.pdf
- Description:
- IC REG BCK BST 3.3V 2.1A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
ISL91127IINZ-T7A from Renesas Electronics is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A continuous output current at 3.3V across 2.5V–4.35V input range. It features 2.5MHz switching frequency, 30µA quiescent current, and automatic seamless buck/boost mode transitions-designed for single-cell Li-ion battery systems in portable medical and consumer devices.
For engineers reviewing the ISL91127IINZ-T7A datasheet, ISL91127IINZ-T7A pinout, ISL91127IINZ-T7A application, or ISL91127IINZ-T7A equivalent, this device supports fixed 3.3V output with no external feedback components, integrates short-circuit/thermal/UVLO protection, and targets brownout-free system voltage regulation in space-constrained handheld platforms.
Technical Context
The ISL91127IINZ-T7A implements Renesas' proprietary buck-boost algorithm that dynamically selects between buck and boost topologies based on real-time PVIN–VOUT differential, enabling stable regulation when input voltage crosses output voltage. Its 4-switch synchronous architecture eliminates body-diode conduction losses and supports bidirectional energy transfer during mode transitions.
It operates in either forced PWM or auto PFM mode via the MODE pin, with PFM-to-PWM transition at 200mA load and PWM-to-PFM at 75mA. Internal gate drivers, low-rDS(on) MOSFETs (32mΩ P-ch / 37mΩ N-ch), and integrated soft-start (1–3ms depending on mode) ensure robust startup and transient response under varying battery voltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous at VOUT = 3.3V, PVIN = 2.5V - sufficient to power baseband processors and RF front-ends in smartphones and tablets. |
| Input Voltage Range | 1.8V to 5.5V - accommodates full discharge curve of single-cell Li-ion (2.5V–4.35V) plus headroom for USB or adapter inputs. |
| Switching Frequency | 2.5MHz (typical) - enables use of compact 1µH inductors and minimizes EMI filtering requirements. |
| Quiescent Current | 30µA - extends battery runtime in standby/sleep states without compromising light-load efficiency. |
| Output Voltage Accuracy | ±2% in PWM mode, ±4% in PFM mode - ensures reliable logic-level compliance for 3.3V I/O rails. |
| Protection Features | Short-circuit, over-temperature (155°C shutdown), UVLO (1.795V rising threshold), and soft-discharge (120Ω internal pull-down) - eliminates need for external fault-handling circuitry. |
| Efficiency Peak | 96% - achieved at mid-load in buck or boost mode, reducing thermal stress in sealed enclosures. |
Pinout & Package
ISL91127IINZ-T7A is housed in a RoHS-compliant 20-lead, 4mm × 4mm QFN package (L20.4x4C) with exposed thermal pad (EPAD) connected to PGND for enhanced thermal dissipation in high-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 6–9) | Power input supply rail | Accepts 1.8V–5.5V; requires dual 10µF X5R ceramic capacitors to PGND for low-impedance high-frequency decoupling. |
| LX1 (Pins 4–5) | Inductor connection (input side) | Drives inductor during buck-mode high-side switch operation; connects to one end of 1µH shielded inductor. |
| LX2 (Pins 1–2) | Inductor connection (output side) | Completes inductor loop during boost-mode operation; must be routed with minimal loop area to reduce EMI. |
| VOUT (Pins 17–20) | Regulated output node | Delivers up to 2A at 3.3V; requires dual 22µF X5R ceramics to PGND for low-output-ripple performance. |
| EN (Pin 11) | Enable control input | Active-high logic signal; drives HIGH to initiate soft-start sequence and LOW to engage 120Ω internal soft-discharge path. |
| MODE (Pin 12) | Operating mode selection | HIGH enables auto PFM for ultra-low IQ; LOW forces PWM for predictable frequency and reduced output ripple. |
| FB (Pin 15) | Feedback reference input | Internally tied to VOUT for fixed 3.3V version; left unconnected per datasheet for ISL91127IINZ-T7A (no external divider required). |
| PGND (Pin 3) | Power ground return | High-current return path for LX1/LX2 switching nodes; must be solid copper plane directly beneath EPAD. |
| SGND (Pins 13–14) | Analog ground reference | Low-noise reference for error amplifier and bandgap; isolated from PGND to prevent switching noise coupling into regulation loop. |
| VIN (Pin 10) | Bias supply input | Provides stable operating voltage for internal references and control logic; must be ≥1.8V and decoupled locally. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Zero-interruption regulation when PVIN crosses VOUT - maintains uninterrupted 3.3V rail during battery sag or surge events. |
| 4-switch synchronous architecture | Eliminates external diodes and reduces conduction loss by >30% vs. traditional buck-boost implementations using discrete FETs. |
| Integrated soft-discharge | 120Ω internal resistor discharges VOUT safely on disable - prevents backfeed into powered-down subsystems and simplifies sequencing. |
| 2.5MHz constant-frequency PWM | Enables <1mm² total passive footprint (1µH + 2×22µF) - critical for ultra-thin mobile PCBs with strict height constraints. |
| Thermal shutdown with hysteresis | Shuts down at 155°C and resumes at 125°C - provides safe margin for sustained 2A operation in 65°C ambient handheld environments. |
Applications
| Smartphone System Voltage Rail | Portable Medical Monitor Power |
|---|---|
|
Use Scenario: Maintaining stable 3.3V core voltage for application processor and display interface as Li-ion battery discharges from 4.2V to 2.8V. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing brownout-free system rail with seamless mode transitions. Use Value: Extends usable battery capacity by >15% compared to fixed-buck solutions, enabling longer screen-on time without voltage collapse. |
Use Scenario: Powering ECG front-end analog circuitry and Bluetooth LE radio in a Class II medical wearable with single-cell Li-ion. IC Role / Device Role / Timing Role: Single-chip regulated power source ensuring low-noise 3.3V supply across full battery life cycle. Use Value: 30µA IQ and <10mVpp output ripple meet IEC 60601-1 EMI and accuracy requirements for clinical-grade biosignal acquisition. |
| Tablet Baseband Subsystem | Wireless Earbud Charging Case |
|
Use Scenario: Delivering clean 3.3V to LTE modem and PMIC in a 7-inch tablet where board space limits discrete power stage count. IC Role / Device Role / Timing Role: High-density buck-boost converter replacing multi-stage buck + LDO solution. Use Value: Reduces BOM count by 7 components (2 inductors, 3 caps, 2 diodes) while improving full-load efficiency by 8% at 1.5A. |
Use Scenario: Regulating 3.3V output from variable 3.0–4.4V battery pack in compact TWS earbud charging case with tight thermal envelope. IC Role / Device Role / Timing Role: Efficient step-up/step-down regulator supporting both charging and case MCU operation. Use Value: 2.5MHz operation allows use of 1.0×0.6mm inductor, meeting 3.5mm max height requirement for slim form factor. |
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 | 4-switch architecture, 2.2MHz fSW, 1.8A max output, no integrated soft-discharge | Lacks internal VOUT discharge path - requires external circuitry for controlled shutdown sequencing | Preferred where cost sensitivity outweighs sequencing simplicity and 200mA lower current rating is acceptable |
| TPS63020DSJR | 4-switch topology, 2.4MHz fSW, 3A output, 25µA IQ, but larger 16-pin WQFN (3×3mm) | Higher peak current capability but 25% larger footprint and no MODE pin for PFM/PWM override | Chosen when >2A load margin is mandatory and board area permits 3×3mm package |
Compared with ISL91127IINZ-T7A, MP2918GQ-Z offers lower cost but sacrifices soft-discharge safety and current capability, while TPS63020DSJR delivers higher output current in a larger footprint without programmable mode control - making ISL91127IINZ-T7A optimal for space-constrained 2A applications requiring robust sequencing and minimal external components.
Availability
ISL91127IINZ-T7A is available at Aetrix Electronics and suitable for smartphone system rails, portable medical monitors, tablet baseband subsystems, wireless earbud charging cases, and handheld industrial scanners requiring stable component supply with guaranteed long-term sourcing.
Supply support for ISL91127IINZ-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 delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets, with deep expertise in high-efficiency power management ICs.
The ISL91127IINZ-T7A belongs to Renesas' ISL911xx family of high-current buck-boost regulators, engineered specifically for advanced single-cell Li-ion battery systems demanding seamless voltage regulation across wide input ranges.
FAQ
What output voltage does the ISL91127IINZ-T7A deliver?
The ISL91127IINZ-T7A is a fixed-output variant delivering 3.3V nominal output voltage. It achieves this without external feedback resistors - the FB pin is internally connected to VOUT. Output voltage accuracy is ±2% in PWM mode and ±4% in PFM mode across -40°C to +85°C ambient temperature and full input voltage range (1.8V–5.5V).
Does the ISL91127IINZ-T7A require external compensation components?
No, the ISL91127IINZ-T7A uses an internally compensated control loop optimized for standard 1µH inductors and 2×22µF output capacitors. No external compensation network is needed for stable operation - simplifying design and reducing bill-of-materials count in space-constrained applications.
How does the ISL91127IINZ-T7A handle input voltage crossing the output voltage?
The ISL91127IINZ-T7A automatically and seamlessly transitions between buck and boost modes using Renesas' proprietary algorithm. When PVIN approaches 3.3V, it rapidly alternates topologies to maintain regulation - resulting in <10mVpp output ripple and no dropout or glitch, even during dynamic battery discharge.
What thermal performance can be expected from the ISL91127IINZ-T7A in a 2A application?
In a typical 4-layer PCB with 1-in² 2oz copper thermal pad connected to the EPAD, the ISL91127IINZ-T7A reaches ~75°C junction temperature at 2A/3.3V with 3.6V input at +25°C ambient. Its thermal shutdown activates at 155°C with 30°C hysteresis, ensuring safe operation under sustained load in handheld enclosures.
Is the ISL91127IINZ-T7A pin-compatible with other members of the ISL911xx family?
No - the ISL91127IINZ-T7A uses a 20-pin QFN package, while ISL91127 variants in WLCSP (e.g., ISL91127) have different pin counts and layouts. Even within QFN variants, pin functions differ: ISL91127IRAZ (adjustable version) requires FB connection to external resistors, whereas ISL91127IINZ-T7A ties FB internally and leaves it unused.
ISL91127IINZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-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:
- 2.1A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLCSP (2.15x1.74)
ISL91127IINZ-T7A FAQ
1.How can I place an order for ISL91127IINZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91127IINZ-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 ISL91127IINZ-T7A reliable?
The price and inventory of ISL91127IINZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91127IINZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91127IINZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91127IINZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91127IINZ-T7A?
ISL91127IINZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91127IINZ-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 ISL91127IINZ-T7A?
For technical support, including ISL91127IINZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91127IINZ-T7A requirements.
6.How does Aetrix verify that ISL91127IINZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91127IINZ-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 ISL91127IINZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91127IINZ-T7A?
All ISL91127IINZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91127IINZ-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 ISL91127IINZ-T7A part is unused and in its original packaging.
Return procedure for ISL91127IINZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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