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Renesas ISL91127IRAZ-T
- Part No.:
- ISL91127IRAZ-T
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91127IRAZ-T.pdf
- Description:
- IC REG BUCK BST ADJ/1V 2A 20QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL91127IRAZ-T from Renesas Electronics is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator with integrated 4.5A switches, designed for single-cell Li-ion battery systems where input voltage may fall below or rise above the regulated output. It delivers up to 2A continuous output at 3.3V across 2.5V–4.35V battery range, features 2.5MHz switching, 30µA quiescent current, and automatic seamless buck/boost mode transitions-enabling brownout-free operation in smartphones and portable medical devices.
For engineers reviewing the ISL91127IRAZ-T datasheet, ISL91127IRAZ-T pinout, ISL91127IRAZ-T application, or ISL91127IRAZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters (1.8V–5.5V input, 1.0V–5.2V adjustable output, ±2% VOUT accuracy), package mapping to 20-lead 4mm×4mm QFN, and two rigorously cross-checked alternative regulators for similar buck-boost power management roles.
Technical Context
The ISL91127IRAZ-T implements a proprietary 4-switch synchronous buck-boost topology with automatic mode transition logic that avoids discontinuities during VIN ≈ VOUT crossing. Its control architecture combines PWM and PFM modes, with load-dependent thresholds (75mA PWM→PFM, 200mA PFM→PWM) and a dedicated MODE pin supporting external clock synchronization (2.75–3.25MHz).
It integrates dual low-RDS(ON) MOSFETs (32mΩ P-channel, 37mΩ N-channel), soft-start (1–3ms depending on mode), internal 0.8V reference, and comprehensive protection including thermal shutdown (155°C trip, 30°C hysteresis), short-circuit detection via FB monitoring, and undervoltage lockout (1.725V rising threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports wide battery discharge curves and system rail flexibility without external pre-regulation. |
| Output Voltage Range | 1.0V to 5.2V (adjustable) - configured via external resistor divider on FB pin; fixed versions not applicable to ISL91127IRAZ-T. |
| Max Continuous Output Current | 2A at VOUT = 3.3V, PVIN = 2.5V - validated under worst-case battery voltage for energy harvesting efficiency. |
| Switching Frequency | 2.5MHz (typical) - enables use of compact 1µH inductors and minimizes EMI filter size. |
| Quiescent Current | 30µA - sustains >90% efficiency at light loads (e.g., standby in handheld devices). |
| Output Voltage Accuracy | ±2% at 3.3V, PWM mode - ensures stable MCU core or RF PA bias under dynamic load and temperature. |
| Protection Features | Thermal shutdown, short-circuit, and UVLO - autonomous fault response without host intervention required. |
Pinout & Package
ISL91127IRAZ-T is housed in a 20-lead, 0.5mm pitch, 4mm × 4mm QFN package (RoHS-compliant, L20.4x4C drawing) with exposed thermal pad (EPAD) requiring connection to PGND for thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pins 1,2,17–20) | Regulated output node | Four parallel pins reduce IR drop and thermal resistance; connect 2×22µF ceramic capacitors directly to PGND. |
| PVIN (Pins 6–9) | Main power input | Accepts 1.8V–5.5V; requires 2×10µF decoupling to PGND; separate from VIN to isolate high di/dt paths. |
| LX1 (Pins 4,5) & LX2 (Pins 1,2) | Inductor switch nodes | LX1 connects to inductor input side (buck high-side/boost low-side); LX2 to output side (buck low-side/boost high-side). |
| PGND (Pin 3) & SGND (Pins 13,14) | Power vs. analog ground | PGND carries high-frequency switching current; SGND serves error amplifier and feedback path-must be separated and joined at single point. |
| FB (Pin 15) | Feedback input | Monitors divided output voltage; 20nA bias current allows high-value resistors (e.g., 1MΩ/324kΩ for 3.3V) minimizing divider loss. |
| MODE (Pin 12) | Operating mode control | Logic HIGH enables auto PFM; LOW forces PWM; also accepts external sync clock (2.75–3.25MHz) for EMI reduction. |
| EN (Pin 11) | Enable input | Active-HIGH logic; drives device into shutdown with 0.05µA supply current and activates 120Ω internal VOUT discharge path. |
| NC (Pin 16) | No-connect | Must remain unconnected; no internal circuitry attached. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch synchronous architecture | Eliminates body-diode conduction losses during mode transitions, enabling >96% peak efficiency and ultra-low output ripple near VIN = VOUT. |
| Automatic buck/boost mode transition | Seamless handoff without output voltage glitch or audible noise-critical for noise-sensitive RF power amplifiers. |
| 2.5MHz fixed-frequency PWM + PFM hybrid control | Reduces inductor and capacitor footprint while maintaining high light-load efficiency via adaptive mode switching. |
| Integrated 0.8V reference with ±0.5% tolerance | Ensures tight output regulation across -40°C to +85°C ambient, supporting precision analog and digital subsystems. |
| Thermal pad (EPAD) with 5°C/W θJC | Enables 2A continuous operation at +85°C ambient without external heatsink when properly soldered to PGND plane. |
Applications
| Smartphone System Rail | Portable Medical Monitor |
|---|---|
Use Scenario: Maintaining stable 3.3V system rail as Li-ion battery discharges from 4.2V to 2.8V while powering baseband processor and display driver. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated output independent of battery voltage sag. Use Value: Prevents brownout resets and extends usable battery life by extracting energy down to 2.5V, increasing runtime by ~12% versus fixed-buck solutions. | Use Scenario: Powering ECG front-end analog circuitry and Bluetooth LE radio in a handheld diagnostic device with strict low-noise and low-power requirements. IC Role / Device Role / Timing Role: Low-quiescent-current, low-ripple power source ensuring signal integrity and extended battery life between charges. Use Value: 30µA IQ and <10mVpp output ripple preserve ADC SNR and enable >72-hour continuous operation on single cell. |
| 2G/3G/4G RF Power Amplifier | Tablet PC Core Logic Supply |
Use Scenario: Delivering dynamically adjusted 3.0–4.2V bias to multi-band cellular PA modules requiring fast transient response and minimal voltage droop. IC Role / Device Role / Timing Role: High-slew-rate, current-limited buck-boost controller responding to PA envelope tracking demands. Use Value: 4.5A internal switches and 100µs load transient recovery (<50mV droop) maintain PA linearity and maximize transmit efficiency. | Use Scenario: Providing clean, scalable 1.0–1.2V core voltage to application processor during burst-mode compute tasks with rapid load changes. IC Role / Device Role / Timing Role: Adjustable-output, high-efficiency regulator supporting dynamic voltage scaling (DVS) via FB resistor network. Use Value: 1.0V–5.2V programmability enables precise DVS implementation, reducing active power by up to 35% versus fixed-VDD designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2964GQ-Z (Monolithic Power Systems) | 4-switch architecture, 2.2MHz switching, 3A output, but lacks PFM mode and has higher 55µA IQ. | Better suited for constant high-load applications; less optimal for battery standby due to higher light-load current. | Select MP2964GQ-Z only if peak current >2A is required and PFM efficiency is secondary. |
| TPS63802DLAR (Texas Instruments) | 4-switch design, 2.1MHz, 2A output, 17µA IQ, but limited 1.8–5.5V input and 1.2–5.5V output range. | Superior light-load efficiency; however, its 1.2V minimum output excludes sub-1.2V core rail applications. | Choose TPS63802DLAR when ultra-low IQ is critical and output ≥1.2V suffices. |
Compared with MP2964GQ-Z and TPS63802DLAR, the ISL91127IRAZ-T uniquely balances 2.5MHz speed, 30µA IQ, and full 1.0–5.2V adjustability-making it optimal for next-gen portable devices demanding both wide output flexibility and battery longevity.
Availability
ISL91127IRAZ-T is available at Aetrix Electronics and suitable for smartphone system rails, portable medical monitors, 2G/3G/4G RF power amplifiers, and tablet PC core logic supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL91127IRAZ-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 specializing in microcontrollers, analog power, and timing solutions for automotive, industrial, and consumer markets.
The ISL91127IR product line delivers high-efficiency, wide-input-range buck-boost regulators optimized for advanced single-cell Li-ion battery systems in space-constrained portable electronics.
FAQ
What output voltage range does the ISL91127IRAZ-T support?
The ISL91127IRAZ-T supports an adjustable output voltage range of 1.0V to 5.2V, set via an external resistor divider on the FB pin. This is confirmed in the Analog Specifications table (Page 4), where VOUT min/max is explicitly stated as 1.0V and 5.2V for the IIAZ variant (identical marking and function to ISL91127IRAZ-T). Fixed-output versions (e.g., ISL91127IRNZ-T) are separate part numbers and do not apply.
Does the ISL91127IRAZ-T require external MOSFETs?
No, the ISL91127IRAZ-T integrates all four power MOSFETs (two P-channel, two N-channel) within the IC. The datasheet confirms "fully synchronous low ON-resistance, 4-switch architecture" and lists rDSON_P = 32mΩ and rDSON_N = 37mΩ in the Analog Specifications table (Page 4). No external switches are needed-only an inductor, input/output capacitors, and FB resistors.
What is the maximum continuous output current for ISL91127IRAZ-T at 3.3V output?
The ISL91127IRAZ-T delivers up to 2A continuous output current at VOUT = 3.3V when PVIN = 2.5V, as specified in the first paragraph of the datasheet (Page 1) and confirmed in the Recommended Operating Conditions table (Page 4). This rating applies across the full -40°C to +85°C ambient temperature range with proper PCB thermal design.
How does the ISL91127IRAZ-T handle transitions between buck and boost modes?
The ISL91127IRAZ-T uses Renesas' proprietary algorithm to automatically and seamlessly transition between buck and boost modes when input voltage approaches the output voltage. As described in the Functional Description (Page 8), this avoids output glitches or ripple spikes-critical for noise-sensitive applications like RF PAs. The block diagram (Page 2) and Buck-Boost Topology figure (Page 9) confirm the 4-switch configuration enabling smooth handoff.
What package type and thermal characteristics does the ISL91127IRAZ-T use?
The ISL91127IRAZ-T uses a 20-lead, 4mm × 4mm QFN package (L20.4x4C) with exposed thermal pad. Thermal resistance is θJA = 40°C/W and θJC = 5°C/W (Page 4), and the absolute maximum junction temperature is +125°C. The EPAD must be soldered to PGND for effective heat dissipation and EMI control, as detailed in the Package Outline Drawing (Page 12) and Applications Information (Page 10).
ISL91127IRAZ-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:
- Adjustable (Fixed)
- 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-QFN (4x4)
ISL91127IRAZ-T FAQ
1.How can I place an order for ISL91127IRAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91127IRAZ-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 ISL91127IRAZ-T reliable?
The price and inventory of ISL91127IRAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91127IRAZ-T is usually 5 days.
3.What payment methods are accepted for ISL91127IRAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91127IRAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91127IRAZ-T?
ISL91127IRAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91127IRAZ-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 ISL91127IRAZ-T?
For technical support, including ISL91127IRAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91127IRAZ-T requirements.
6.How does Aetrix verify that ISL91127IRAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91127IRAZ-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 ISL91127IRAZ-T meets industry standards.
7.What is the process for return or replacement of ISL91127IRAZ-T?
All ISL91127IRAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91127IRAZ-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 ISL91127IRAZ-T part is unused and in its original packaging.
Return procedure for ISL91127IRAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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