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Renesas ISL91127IRNZ-T
- Part No.:
- ISL91127IRNZ-T
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91127IRNZ-T.pdf
- Description:
- IC REG BUCK BOOST 3.3V 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,429
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Product details
Overview
ISL91127IRNZ-T from Renesas Electronics is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A continuous output at 3.3V across 2.5V–4.35V battery input range. It features 2.5MHz switching frequency, 30µA quiescent current, and automatic seamless buck/boost mode transitions. Designed for single-cell Li-ion systems requiring brownout-free voltage rail in smartphones and medical handhelds.
For engineers reviewing the ISL91127IRNZ-T datasheet, ISL91127IRNZ-T pinout, ISL91127IRNZ-T application, or ISL91127IRNZ-T equivalent, key selection criteria include its 4.5A internal switch capability, fixed 3.3V output (no external feedback required), 20-pin 4mm×4mm QFN package with thermal pad, and integrated short-circuit/thermal/UVLO protection - all critical for compact, battery-sensitive power designs.
Technical Context
The ISL91127IRNZ-T implements a proprietary 4-switch buck-boost topology with synchronous rectification, enabling regulation when input voltage is above, below, or near the output voltage. Its control architecture combines PWM and PFM modes, with automatic transition thresholds at 75mA (PWM→PFM) and 200mA (PFM→PWM), ensuring high efficiency across light-to-heavy loads.
It uses separate PVIN (power path) and VIN (bias supply) inputs, dual ground planes (PGND for high-current switching, SGND for analog reference), and an internal 0.8V reference with ±2% accuracy in PWM mode. The MODE pin supports forced PWM or auto-PFM operation and accepts external clock sync (2.75–3.25MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 4-switch synchronous buck-boost - enables regulation across full input range without discontinuity or dropout |
| Output Voltage | Fixed 3.3V - eliminates need for external resistor divider; FB pin internally connected to VOUT |
| Max Output Current | 2A continuous at VOUT=3.3V, PVIN=2.5V - sufficient for RF PA bias and system SoC rails in portable devices |
| Switching Frequency | 2.5MHz (typ) - allows use of small 1µH inductor and low-ESR ceramic capacitors (2×10µF in, 2×22µF out) |
| Quiescent Current | 30µA in PFM mode - extends battery runtime during standby/sleep states in always-on subsystems |
| Input Voltage Range | 1.8V to 5.5V - supports wide battery discharge curve (Li-ion 4.35V down to 2.5V) and USB-powered operation |
| Protection Features | Short-circuit, over-temperature (155°C shutdown), and undervoltage lockout (1.725V rising threshold) - ensures robust field reliability |
Pinout & Package
ISL91127IRNZ-T is housed in a 20-lead, 0.5mm pitch, 4mm×4mm QFN package (RoHS-compliant, L20.4x4C drawing) with exposed thermal pad (EPAD) that must be soldered to PGND for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pins 1,2,17–20) | Regulated output node | Four parallel pins reduce IR drop and improve current sharing; connect 2×22µF X5R ceramics directly to PGND |
| PVIN (Pins 6–9) | Main power input | Accepts 1.8–5.5V; requires 2×10µF X5R decoupling to PGND; separate from VIN to isolate high di/dt paths |
| LX1 (Pins 4,5) | Inductor connection (input side) | High-side switching node for buck operation and low-side for boost; routed with minimal loop area to reduce EMI |
| LX2 (Pins 1,2) | Inductor connection (output side) | Low-side switching node for buck and high-side for boost; shares pins with VOUT - requires careful layout partitioning |
| PGND (Pin 3) | Power ground return | Primary return path for high-frequency switching currents; must be solid copper plane under EPAD and LX pins |
| SGND (Pins 13,14) | Analog ground reference | Reference for error amplifier and FB comparator; isolated from PGND to prevent noise coupling into regulation loop |
| EN (Pin 11) | Enable logic input | Active-high TTL-compatible (VIH ≥1.4V); asserts soft-start sequence and activates internal 120Ω soft-discharge resistor when pulled low |
| MODE (Pin 12) | Operating mode control | High = auto-PFM (light-load efficiency), Low = forced PWM (fixed frequency, lower ripple); also accepts external sync clock |
| FB (Pin 15) | Feedback input | Internally tied to VOUT for fixed 3.3V version; not used externally - simplifies BOM and layout |
| NC (Pin 16) | No-connect terminal | Must remain unconnected; no internal circuitry attached - avoid routing or stitching |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost mode transition | Seamless crossover at VIN ≈ VOUT eliminates output voltage glitch and maintains regulation without user intervention |
| 2.5MHz constant-frequency PWM | Enables ultra-compact passive component selection (1µH inductor, 10–22µF ceramics), reducing solution footprint by >30% vs. 1MHz designs |
| 30µA quiescent current | Extends battery life in IoT sensors and wearable sleep modes where load current drops below 100µA |
| Integrated 4-switch power stage | Eliminates need for external MOSFETs and gate drivers - reduces BOM count, layout complexity, and failure points |
| Dual ground separation (PGND/SGND) | Prevents switching noise from corrupting feedback accuracy, enabling ±2% output regulation across temperature and line/load |
Applications
| Smartphone System Rail | Portable Medical Monitor |
|---|---|
Use Scenario: Maintaining stable 3.3V system voltage during Li-ion battery discharge from 4.35V to 2.5V while powering baseband SoC and memory. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing uninterrupted power rail independent of battery state-of-charge. Use Value: Prevents brownout resets and data corruption by sustaining regulated output even when battery voltage falls below nominal system voltage. | Use Scenario: Powering low-noise analog front-end (AFE), microcontroller, and display in handheld ECG device with single-cell Li-ion battery. IC Role / Device Role / Timing Role: High-efficiency, low-ripple DC/DC converter supplying clean 3.3V rail for precision signal acquisition and real-time processing. Use Value: 30µA IQ and <10mVpp output ripple ensure extended battery life and minimal interference on sensitive biopotential measurements. |
| 4G LTE RF Power Amplifier | Wireless Hearing Aid Transceiver |
Use Scenario: Delivering 3.3V bias to 4G PA modules operating across wide input voltage range (3.0–4.2V) with dynamic envelope tracking demands. IC Role / Device Role / Timing Role: Fast-transient-response buck-boost regulator supporting rapid PA supply modulation without droop or overshoot. Use Value: 2A peak capability and 2.5MHz switching enable tight transient response (<50µs recovery) and reduced output capacitance. | Use Scenario: Supplying ultra-low-power Bluetooth LE transceiver and DSP core in rechargeable hearing aid using 3.7V Li-poly cell. IC Role / Device Role / Timing Role: Standalone fixed-output regulator with integrated soft-start and discharge, eliminating need for external sequencing components. Use Value: Soft-discharge (120Ω) safely bleeds VOUT on shutdown, preventing latch-up in downstream CMOS circuits during battery replacement. |
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 | Lower max output current (1.8A), 2.4MHz switching, no MODE pin for external sync | Optimized for space-constrained wearables; lacks programmable PFM/PWM transition thresholds | Choose when board area is tighter than 4mm×4mm and 1.8A suffices |
| MAX77827BEWC+T | Higher IQ (50µA), 2.2MHz, integrated I2C interface for DVS, WLCSP-20 package | Supports dynamic voltage scaling in multi-rail PMIC systems; requires firmware control | Choose when system-level voltage coordination via I2C is required and WLCSP layout is acceptable |
Compared with TPS63020DSJR and MAX77827BEWC+T, the ISL91127IRNZ-T delivers higher continuous current (2A), lower quiescent current (30µA), and direct MODE pin flexibility for external clock synchronization - making it optimal for high-performance, battery-critical applications where fixed 3.3V output and minimal external components are prioritized.
Availability
ISL91127IRNZ-T is available at Aetrix Electronics and suitable for smartphone system rails, portable medical monitors, 4G RF power amplifiers, and wireless hearing aid transceivers requiring stable component supply across industrial temperature range (-40°C to +85°C).
Supply support for ISL91127IRNZ-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 SoC solutions for automotive, industrial, and enterprise applications.
The ISL91127IRNZ-T belongs to Renesas' high-efficiency buck-boost regulator family, designed specifically for advanced single-cell Li-ion battery systems demanding brownout-free operation and minimal solution size.
FAQ
What is the output voltage configuration of the ISL91127IRNZ-T?
The ISL91127IRNZ-T is a fixed-output variant set to 3.3V. Its FB pin is internally connected to VOUT, eliminating the need for an external resistor divider. This configuration simplifies design, reduces BOM cost, and improves long-term output accuracy by removing external component drift and noise susceptibility - a key advantage over adjustable versions like ISL91127IRAZ-T.
Does the ISL91127IRNZ-T require external compensation components?
No, the ISL91127IRNZ-T integrates full internal compensation. Its control loop is factory-tuned for stability with the recommended 1µH inductor and 2×22µF output capacitors. No external RC networks or feed-forward capacitors are needed - unlike the adjustable ISL91127IRAZ-T, which requires C3 across R1 for optimal transient response and regulation.
How does the ISL91127IRNZ-T handle input voltage transitions near the output voltage?
The ISL91127IRNZ-T uses Renesas' proprietary algorithm to automatically and seamlessly alternate between buck and boost modes when PVIN approaches 3.3V. This prevents output voltage discontinuity or ripple spikes, maintaining regulation with <10mVpp ripple - critical for noise-sensitive analog circuits and high-speed digital interfaces powered from the same rail.
What thermal management provisions does the ISL91127IRNZ-T include?
The ISL91127IRNZ-T incorporates thermal shutdown at +155°C (typical) with 30°C hysteresis, resuming operation at +125°C. Its 4mm×4mm QFN package features an exposed thermal pad (EPAD) that must be soldered to a dedicated PGND copper pour. With θJC = 5°C/W, proper thermal pad connection enables >2W power dissipation in still air - sufficient for 2A output at 3.3V with ≤1.2V input–output differential.
Can the ISL91127IRNZ-T be synchronized to an external clock?
Yes, the MODE pin of the ISL91127IRNZ-T accepts an external clock signal in the 2.75MHz to 3.25MHz range. When driven with a clean square wave, the device synchronizes its internal oscillator to the external source - reducing beat frequencies and EMI in multi-regulator systems. This capability is retained even in auto-PFM mode, enabling deterministic timing control without forcing continuous PWM.
ISL91127IRNZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
ISL91127IRNZ-T FAQ
1.How can I place an order for ISL91127IRNZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91127IRNZ-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 ISL91127IRNZ-T reliable?
The price and inventory of ISL91127IRNZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91127IRNZ-T is usually 5 days.
3.What payment methods are accepted for ISL91127IRNZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91127IRNZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91127IRNZ-T?
ISL91127IRNZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91127IRNZ-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 ISL91127IRNZ-T?
For technical support, including ISL91127IRNZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91127IRNZ-T requirements.
6.How does Aetrix verify that ISL91127IRNZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91127IRNZ-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 ISL91127IRNZ-T meets industry standards.
7.What is the process for return or replacement of ISL91127IRNZ-T?
All ISL91127IRNZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91127IRNZ-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 ISL91127IRNZ-T part is unused and in its original packaging.
Return procedure for ISL91127IRNZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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