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Renesas ISL91127IRNZ-T7A
- Part No.:
- ISL91127IRNZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91127IRNZ-T7A.pdf
- Description:
- IC REG BUCK BOOST 3.3V 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:741
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Product details
Overview
ISL91127IRNZ-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 over 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 system voltage in space-constrained portable electronics.
For engineers reviewing the ISL91127IRNZ-T7A datasheet, ISL91127IRNZ-T7A pinout, ISL91127IRNZ-T7A application, or ISL91127IRNZ-T7A equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters (including ±2% VOUT accuracy, 1.8V–5.5V input range, and 40°C/W θJA), and real-world design implications for battery-powered handheld, medical, and RF power amplifier applications.
Technical Context
The ISL91127IRNZ-T7A implements a proprietary 4-switch synchronous buck-boost topology with integrated P/N-channel MOSFETs (rDSON_P = 32mΩ, rDSON_N = 37mΩ) and dual-mode control logic that dynamically selects buck or boost operation based on real-time VIN–VOUT differential. Its 2.5MHz fixed-frequency PWM and auto PFM/PWM transition (75mA/200mA thresholds) enable low-noise, high-transient-response regulation across wide input ranges.
It uses separate PVIN (power path) and VIN (bias supply) rails with dedicated PGND and SGND pins to isolate high-switching-current paths from analog feedback circuitry. The FB pin operates at 0.800V reference with 20nA bias current, supporting precise adjustable outputs from 1.0V to 5.2V via external resistor divider-while fixed 3.3V versions tie VOUT directly to FB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full discharge of advanced Li-ion cells and accommodates USB, adapter, and battery hybrid inputs. |
| Output Current | 2A continuous at VOUT = 3.3V, PVIN = 2.5V - enables stable core rail delivery even at end-of-battery voltage. |
| Switching Frequency | 2.5MHz (typ) - reduces required inductor size (1µH typical) and output capacitance (2×22µF). |
| Quiescent Current | 30µA in PFM mode - extends battery runtime in standby or light-load states (e.g., sensor sleep cycles). |
| VOUT Accuracy | ±2% at 3.3V, PWM mode - ensures reliable logic-level compliance for microcontrollers and RF ICs. |
| Thermal Shutdown | 155°C activation with 30°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Protection Features | Short-circuit, over-temperature, and undervoltage lockout (UVLO = 1.795V rising) - eliminates need for external fault management circuitry. |
Pinout & Package
The ISL91127IRNZ-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 (θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (pins 6–9) | Power input rail | High-current input path for converter switches; requires 2×10µF ceramic capacitors to PGND for low-impedance decoupling. |
| LX1 (pins 4–5) | Inductor connection (input side) | Connects to one end of power inductor; carries bidirectional high-frequency switching current in both buck and boost modes. |
| LX2 (pins 1–2) | Inductor connection (output side) | Connects to opposite end of inductor; forms active switching node with LX1 to implement 4-switch topology. |
| VOUT (pins 17–20) | Regulated output | Delivers final regulated voltage; requires 2×22µF low-ESR ceramic capacitors to PGND for ripple suppression and transient response. |
| FB (pin 15) | Voltage feedback input | Senses output via resistor divider; 0.800V reference enables precise programmable outputs from 1.0V to 5.2V. |
| EN (pin 11) | Enable control | Logic HIGH (>1.4V) activates regulator; LOW (<0.4V) disables device and engages 120Ω internal soft-discharge path. |
| MODE (pin 12) | Operating mode select | HIGH enables auto PFM for efficiency at light loads; LOW forces PWM for consistent frequency and noise control. |
| SGND (pins 13–14) | Analog ground | Reference return for FB, MODE, EN; must be routed separately from PGND to avoid noise coupling into feedback loop. |
| PGND (pin 3) | Power ground | High-current return path for LX1/LX2 switching nodes and PVIN capacitors; connects to EPAD for thermal conduction. |
| NC (pin 16) | No-connect | Unbonded die pad; must remain unconnected on PCB to prevent parasitic coupling or reliability risk. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Seamless switching between topologies when VIN ≈ VOUT eliminates output voltage droop or overshoot during battery sag. |
| 4-switch synchronous architecture | Eliminates external diodes and reduces conduction losses-enabling 96% peak efficiency at 500mA load. |
| 2.5MHz fixed-frequency PWM | Enables use of compact 1µH inductors and minimizes EMI filter footprint in RF-sensitive designs. |
| 30µA quiescent current | Extends battery life in always-on wearable sensors by reducing no-load power draw by >50% vs. legacy buck-boost ICs. |
| Integrated soft-start and soft-discharge | 1ms startup delay + ramped reference prevents inrush current; 120Ω internal discharge path safely collapses VOUT on shutdown. |
Applications
| Smartphone System Rail | Portable Medical Monitor |
|---|---|
Use Scenario: Maintaining stable 3.3V system rail as single-cell Li-ion discharges from 4.2V to 2.8V during active display and cellular transmission. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying power to application processor, memory, and baseband ICs. Use Value: Prevents brownout resets by sustaining regulation down to 2.5V input-extending usable battery capacity by ~12% versus fixed-buck solutions. | Use Scenario: Powering low-noise analog front-end (AFE), microcontroller, and Bluetooth LE radio in a handheld ECG device. IC Role / Device Role / Timing Role: Single-chip power source delivering clean, ripple-free 3.3V from a rechargeable LiPo cell. Use Value: 2.5MHz operation avoids interference with ECG signal band (0.05–150Hz); PFM mode cuts standby current to <1µA system level. |
| 2G/3G/4G RF Power Amplifier | Handheld Barcode Scanner |
Use Scenario: Providing dynamically adjusted VCC to multi-band PA modules requiring 3.0–3.6V under varying transmit power levels. IC Role / Device Role / Timing Role: High-transient-response voltage source enabling fast PA bias modulation during TDD burst transmission. Use Value: 2A capability and <100µs load-step recovery (per Fig. 14) maintain PA linearity during 100mA–1.5A dynamic load swings. | Use Scenario: Powering laser diode driver, CMOS image sensor, and decode engine in intermittent-scan industrial barcode readers. IC Role / Device Role / Timing Role: Main DC/DC converter managing energy-efficient duty cycling between scan bursts and deep sleep. Use Value: 30µA IQ and auto PFM extend battery life to >12 hours per charge; 4mm×4mm QFN fits tight 2-layer PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2965GQ-Z (Monolithic Power) | 4.5A switch rating, 1.2MHz switching, no MODE pin for sync; requires external compensation. | Better suited for higher-current (>2.5A) or lower-EMI applications where board area allows larger inductor. | Select MP2965GQ-Z only if peak current exceeds 2A or if 1.2MHz operation better aligns with system clock domain. |
| TPS63020DSJR (Texas Instruments) | 2A rating, 2.4MHz, integrated load switch, but higher 50µA IQ and ±3% VOUT accuracy. | Preferred where integrated power-path control or tighter layout constraints outweigh efficiency trade-offs. | Choose TPS63020DSJR if system requires controlled power sequencing or if existing TI design ecosystem simplifies qualification. |
Compared with MP2965GQ-Z and TPS63020DSJR, the ISL91127IRNZ-T7A delivers superior light-load efficiency (30µA vs. ≥50µA), tighter output accuracy (±2% vs. ±3%), and dedicated MODE pin for external clock synchronization-making it optimal for battery-sensitive, noise-critical portable devices.
Availability
ISL91127IRNZ-T7A is available at Aetrix Electronics and suitable for smartphone system rails, portable medical monitors, 2G/3G/4G RF power amplifiers, and handheld barcode scanners requiring stable component supply across extended production lifecycles.
Supply support for ISL91127IRNZ-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 specializing in microcontrollers, analog power, and timing solutions for automotive, industrial, and IoT applications.
The ISL91127IR series was developed specifically for high-efficiency, single-cell Li-ion battery systems demanding seamless voltage regulation across full discharge curves-targeting portable consumer, medical, and wireless infrastructure markets.
FAQ
What is the maximum continuous output current supported by the ISL91127IRNZ-T7A?
The ISL91127IRNZ-T7A delivers up to 2A continuous output current at VOUT = 3.3V when PVIN = 2.5V, as specified in the Recommended Operating Conditions table (Page 4). This rating holds across the full –40°C to +85°C ambient temperature range and is validated with 1µH inductor and 2×22µF output capacitors. Peak current capability reaches 4.5A (P-channel limit), but sustained 2A operation requires proper thermal design using the EPAD-connected PGND plane.
Does the ISL91127IRNZ-T7A support adjustable output voltages?
Yes, the ISL91127IRNZ-T7A supports adjustable output voltages from 1.0V to 5.2V using an external resistor divider connected to the FB pin. The internal reference is 0.800V (±1.6mV), and the FB pin draws only 20nA, enabling high-value resistors (e.g., R1 = 1MΩ, R2 = 324kΩ for 3.3V). Fixed-output variants like ISL91127IRNZ-T7A have VOUT internally tied to FB and require no external divider.
How does the MODE pin function on the ISL91127IRNZ-T7A?
The MODE pin on the ISL91127IRNZ-T7A controls operating mode: logic HIGH enables automatic PFM/PWM transition for optimal light-load efficiency, while logic LOW forces continuous PWM operation for predictable frequency and reduced low-frequency noise. Additionally, MODE accepts external clock signals from 2.75MHz to 3.25MHz for synchronization with other system clocks-critical in multi-rail noise-sensitive applications like RF transceivers.
What thermal performance can be expected from the ISL91127IRNZ-T7A in a standard 4-layer PCB layout?
In a standard 4-layer PCB with 2oz copper, 100mm² EPAD thermal pad connected to internal ground planes, the ISL91127IRNZ-T7A achieves θJA ≈ 40°C/W (typical) and θJC = 5°C/W. At 2A load and 3.3V output, power dissipation is ~250mW; this results in ~10°C junction-to-ambient rise above ambient-well below the 125°C max junction limit. Thermal shutdown activates at 155°C with 30°C hysteresis to ensure safe recovery.
Is the ISL91127IRNZ-T7A pin-compatible with other members of the ISL911xx family?
No, the ISL91127IRNZ-T7A is not pin-compatible with other ISL911xx variants. Per Table 1 (Page 3), ISL91127IR uses a 20-lead QFN package, while ISL91127 (WLCSP) and ISL91128 (WLCSP with I2C/DVS) use different footprints and pinouts. Even within the QFN family, ISL91127IRAZ-T7A (adjustable version) shares the same pinout but differs in FB network configuration-requiring layout verification before substitution.
ISL91127IRNZ-T7A 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-T7A FAQ
1.How can I place an order for ISL91127IRNZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91127IRNZ-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 ISL91127IRNZ-T7A reliable?
The price and inventory of ISL91127IRNZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91127IRNZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91127IRNZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91127IRNZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91127IRNZ-T7A?
ISL91127IRNZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91127IRNZ-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 ISL91127IRNZ-T7A?
For technical support, including ISL91127IRNZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91127IRNZ-T7A requirements.
6.How does Aetrix verify that ISL91127IRNZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91127IRNZ-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 ISL91127IRNZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91127IRNZ-T7A?
All ISL91127IRNZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91127IRNZ-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 ISL91127IRNZ-T7A part is unused and in its original packaging.
Return procedure for ISL91127IRNZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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