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Renesas ISL91127IINZ-T
- Part No.:
- ISL91127IINZ-T
- Manufacturer:
- Renesas
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
ISL91127IINZ-T.pdf
- Description:
- IC REG BCK BST 3.3V 2.1A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,356
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Product details
Overview
ISL91127IINZ-T 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 with input range 1.8V–5.5V, 2.5MHz switching frequency, and 30µA quiescent current-designed for single-cell Li-ion battery systems in portable medical and consumer devices.
For engineers reviewing the ISL91127IINZ-T datasheet, ISL91127IINZ-T pinout, ISL91127IINZ-T application, or ISL91127IINZ-T equivalent, key selection considerations include its seamless buck-boost mode transition, fixed 3.3V output, thermal shutdown at 155°C, soft-discharge functionality, and QFN-20 (4mm×4mm) package compatibility with space-constrained PCB layouts.
Technical Context
The ISL91127IINZ-T implements a proprietary 4-switch synchronous buck-boost topology that automatically and seamlessly transitions between buck and boost modes as input voltage crosses the regulated output level. Its control architecture integrates PWM and PFM operation, with load-dependent mode switching thresholds (75mA PWM→PFM, 200mA PFM→PWM).
It features dual ground separation (SGND for analog reference, PGND for high-current switching), dedicated PVIN and VIN inputs for optimized internal reference stability, and integrated protection including short-circuit detection via FB monitoring, over-temperature shutdown with 30°C hysteresis, and undervoltage lockout (1.725V rising threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% accuracy in PWM mode; enables direct replacement of LDOs without external feedback network. |
| Input Voltage Range | 1.8V to 5.5V; supports full discharge curve of Li-ion (2.5V–4.35V) while maintaining regulated 3.3V system rail. |
| Max Continuous Output | 2A at VOUT = 3.3V, PVIN = 2.5V; sufficient for RF power amplifiers and multi-core microcontrollers in handheld devices. |
| Switching Frequency | 2.5MHz (typical); allows use of compact 1µH inductor and reduces EMI fundamental frequency above AM band. |
| Quiescent Current | 30µA in PFM mode; extends battery runtime in always-on sensor or standby states without compromising wake-up response. |
| Thermal Shutdown | 155°C activation with 30°C hysteresis; prevents permanent damage during sustained overload or poor heatsinking. |
| Soft-Discharge | 120Ω internal pull-down on VOUT when EN = LOW; safely discharges output caps without external circuitry during power-down sequencing. |
Pinout & Package
ISL91127IINZ-T is housed in a 20-lead, 0.5mm pitch, 4mm × 4mm QFN package (RoHS-compliant, pkg drawing L20.4x4C) with exposed thermal pad connected to PGND for enhanced thermal performance (θJC = 5°C/W).
| 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; requires 2×22µF ceramic output capacitance to PGND. |
| PVIN (Pins 6–9) | Main power input to switching stage | Accepts 1.8V–5.5V; must be decoupled with 2×10µF X5R ceramics to PGND to suppress high di/dt noise. |
| LX1 (Pins 4,5) | Inductor connection (input side) | High-frequency switching node; connects to one end of 1µH inductor; layout requires short, wide copper pour. |
| LX2 (Pins 1,2) | Inductor connection (output side) | Shared with VOUT pins; forms buck-boost inductor interface; same routing priority as LX1. |
| PGND (Pin 3) | Power ground return | Low-impedance path for peak switch currents; must be tied directly to thermal pad and output capacitor ground. |
| SGND (Pins 13,14) | Analog ground reference | Isolated from PGND to prevent noise coupling into error amplifier; connects only to FB, MODE, EN, and VIN supplies. |
| EN (Pin 11) | Enable logic input | Active-HIGH TTL-compatible (VIH ≥ 1.4V); asserts internal startup sequence and enables soft-start ramp. |
| MODE (Pin 12) | PFM/PWM mode control | HIGH selects auto-PFM for light-load efficiency; LOW forces PWM for constant frequency and lower ripple. |
| FB (Pin 15) | Feedback input | Internally tied to VOUT for fixed 3.3V version; 0.8V reference enables adjustable outputs via resistor divider. |
| NC (Pin 16) | No-connect terminal | Must remain unconnected; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch synchronous architecture | Eliminates external MOSFETs and body-diode conduction losses, enabling >96% peak efficiency across buck/boost transitions. |
| Seamless buck-boost mode transition | Maintains regulation with <10mV output ripple when PVIN ≈ VOUT (e.g., 3.4V → 3.3V), avoiding discontinuous voltage dips. |
| Dual ground separation (SGND/PGND) | Prevents switching noise from corrupting feedback accuracy and reference stability, critical for ±2% output tolerance. |
| Integrated soft-discharge | 120Ω internal resistor discharges VOUT to safe levels within ~10ms after EN deactivation-no external FET or timing circuit required. |
| 2.5MHz constant-frequency option | Enables predictable EMI filtering and consistent loop response; avoids variable-frequency jitter in noise-sensitive audio or RF sections. |
Applications
| Smartphone System Rail | Portable Ultrasound Probe |
|---|---|
Use Scenario: Maintaining stable 3.3V core voltage for AP/SoC and PMIC as Li-ion battery discharges from 4.2V to 2.8V. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying main system rail with seamless mode transition and minimal voltage droop. Use Value: Eliminates brownouts during deep discharge, extending usable battery capacity by >15% compared to fixed-buck solutions. | Use Scenario: Powering FPGA, ADC, and analog front-end in handheld medical imaging device with strict low-noise requirements. IC Role / Device Role / Timing Role: Low-ripple, high-efficiency power source with PFM mode for standby and forced PWM during image capture bursts. Use Value: Achieves <10mVpp output ripple in boost mode and 30µA IQ enables >72-hour battery life in sleep mode. |
| 4G LTE Power Amplifier Bias | Wearable ECG Monitor |
Use Scenario: Delivering clean, dynamically scalable 3.3V bias to RF PA stages under varying transmit power and battery voltage conditions. IC Role / Device Role / Timing Role: High-current, fast-transient regulator supporting 0–2A load steps with <50mV undershoot/overshoot. Use Value: Meets 3GPP spectral mask requirements by minimizing supply-induced phase noise through tight line/load regulation (±5mV/V, ±0.005mV/mA). | Use Scenario: Supplying ultra-low-power MCU, biosensor ASIC, and BLE radio from coin-cell or small Li-ion in clinical-grade wearable. IC Role / Device Role / Timing Role: Always-on power manager with programmable enable sequencing and soft-start to prevent sensor initialization glitches. Use Value: Soft-start time <3ms and 30µA quiescent current enable reliable cold-start from 2.5V and >30-day battery life at 1Hz sampling. |
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 (1.8A), 2.4MHz switching, no separate PVIN/VIN pins; uses single input rail. | Suitable for cost-sensitive consumer wearables but lacks dual-input architecture for optimal reference stability. | Choose TPS63020DSJR only if board space allows larger inductor and system does not require sub-2.5V start-up or ultra-low IQ. |
| MAX77827AEWE+T | Higher peak current (4A), I²C programmability, 1.8MHz switching; includes DVS and bypass mode. | Better for complex PMIC integration with dynamic voltage scaling, but larger QFN-24 package and higher BOM cost. | Select MAX77827AEWE+T when firmware-controlled output adjustment or multi-rail coordination is required beyond fixed 3.3V operation. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the ISL91127IINZ-T delivers superior light-load efficiency (30µA vs. 45µA/65µA), tighter output accuracy (±2% vs. ±3%/±2.5%), and optimized thermal performance (θJC = 5°C/W) in the smallest footprint-making it ideal for space- and battery-life constrained portable medical designs.
Availability
ISL91127IINZ-T is available at Aetrix Electronics and suitable for smartphone system rails, portable ultrasound probes, 4G LTE power amplifier bias, and wearable ECG monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL91127IINZ-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 IoT applications-with emphasis on high-reliability, energy-efficient power management ICs.
The ISL91127IINZ-T belongs to Renesas' ISL911xx buck-boost regulator family, engineered specifically for advanced single-cell battery systems where input voltage frequently crosses the regulated output level-enabling maximum energy extraction without system brownouts.
FAQ
What is the operating temperature range for the ISL91127IINZ-T?
The ISL91127IINZ-T is specified for operation from –40°C to +85°C ambient temperature. Its thermal shutdown activates at +155°C junction temperature with +30°C hysteresis, ensuring robust reliability in sealed portable enclosures. The device's 4mm×4mm QFN package with exposed thermal pad achieves θJC = 5°C/W, facilitating effective heat transfer to the PCB ground plane under continuous 2A load conditions.
Does the ISL91127IINZ-T require external feedback resistors?
No, the ISL91127IINZ-T is the fixed 3.3V output variant and does not require external feedback resistors. Its FB pin is internally connected to VOUT, eliminating the need for an external resistor divider. This simplifies layout, reduces component count, and improves output accuracy to ±2% in PWM mode-unlike the adjustable ISL91127IRAZ-T, which requires R1/R2 to set VOUT between 1.0V and 5.2V.
How does the ISL91127IINZ-T handle input voltages near the 3.3V output level?
The ISL91127IINZ-T uses Renesas' proprietary 4-switch buck-boost algorithm to rapidly and seamlessly transition between buck and boost modes when PVIN approaches 3.3V. This maintains regulation with <10mVpp output ripple and avoids voltage droop or discontinuity-critical for brownout-free operation in smartphones and tablets during battery discharge from 3.6V to 3.0V.
What protection features are integrated into the ISL91127IINZ-T?
The ISL91127IINZ-T integrates short-circuit protection (via FB voltage monitoring), over-temperature shutdown (155°C activation, 125°C recovery), input undervoltage lockout (1.725V rising threshold), and soft-discharge (120Ω internal VOUT pull-down). It also includes anti-shoot-through circuitry for gate drivers and current-limit protection on P-channel MOSFETs (4.5A typical peak limit).
Can the ISL91127IINZ-T synchronize to an external clock?
Yes, the MODE pin of the ISL91127IINZ-T supports external clock synchronization. When driven with a 2.75MHz–3.25MHz square wave, the device locks its internal oscillator to the external signal-enabling EMI reduction through frequency dithering or alignment with system clocks. This capability is retained even in forced PWM mode, providing deterministic timing control for noise-sensitive applications like medical imaging or audio processing.
ISL91127IINZ-T 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-T FAQ
1.How can I place an order for ISL91127IINZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91127IINZ-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 ISL91127IINZ-T reliable?
The price and inventory of ISL91127IINZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91127IINZ-T is usually 5 days.
3.What payment methods are accepted for ISL91127IINZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91127IINZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91127IINZ-T?
ISL91127IINZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91127IINZ-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 ISL91127IINZ-T?
For technical support, including ISL91127IINZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91127IINZ-T requirements.
6.How does Aetrix verify that ISL91127IINZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91127IINZ-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 ISL91127IINZ-T meets industry standards.
7.What is the process for return or replacement of ISL91127IINZ-T?
All ISL91127IINZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91127IINZ-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 ISL91127IINZ-T part is unused and in its original packaging.
Return procedure for ISL91127IINZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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