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Renesas ISL91127IRAZ-T7A
- Part No.:
- ISL91127IRAZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL91127IRAZ-T7A.pdf
- Description:
- IC REG BUCK BST ADJ/1V 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,570
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Product details
Overview
ISL91127IRAZ-T7A from Renesas Electronics is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator with integrated 4.5A switches, supporting input voltages from 1.8V to 5.5V and adjustable output voltages from 1.0V to 5.2V. It delivers up to 2A continuous output at 3.3V across a 2.5V–4.35V battery range and features 2.5MHz switching, 30µA quiescent current, and automatic buck/boost mode transitions for Li-ion battery-powered systems.
For engineers reviewing the ISL91127IRAZ-T7A datasheet, ISL91127IRAZ-T7A pinout, ISL91127IRAZ-T7A application, or ISL91127IRAZ-T7A equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves (up to 96%), real-world load transient behavior (0A→2A), and precise thermal shutdown thresholds (155°C) - all critical for portable medical device, smartphone brownout protection, and RF PA power supply designs.
Technical Context
The ISL91127IRAZ-T7A implements a proprietary 4-switch buck-boost topology with automatic seamless mode transitions, enabling stable regulation when input voltage crosses the output setpoint. Its control architecture combines PWM and PFM operation, with programmable MODE pin selection (auto-PFM or forced PWM) and internal soft-start ramping that adapts timing based on operating mode (2ms buck vs. 3ms boost).
It integrates separate PVIN (power path) and VIN (bias supply) inputs, dual ground paths (PGND for high-current switching, SGND for analog reference), and active reverse-current blocking. Protection includes short-circuit detection via FB monitoring, thermal shutdown with 30°C hysteresis, and undervoltage lockout (1.725V rising threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full single-cell Li-ion discharge curve (2.5V–4.35V) plus USB and adapter inputs. |
| Output Voltage Range | 1.0V to 5.2V - adjustable via external resistor divider; fixed 3.3V/3.5V versions also available. |
| Max Continuous Output Current | 2A at VOUT = 3.3V, PVIN = 2.5V - enables high-power subsystems without external boost stages. |
| Switching Frequency | 2.5MHz (typ) - reduces inductor size (1µH typical) and eases EMI filtering requirements. |
| Quiescent Current | 30µA - maintains >85% efficiency at 10mA load, critical for always-on battery applications. |
| Efficiency Peak | 96% - achieved under PWM mode at mid-load; enabled by 32mΩ P-FET and 37mΩ N-FET RDS(ON). |
| Thermal Shutdown | 155°C (typ), with 30°C hysteresis - ensures safe recovery after overload without manual reset. |
Pinout & Package
ISL91127IRAZ-T7A is housed in a 20-lead, 4mm × 4mm, 0.5mm pitch QFN package (RoHS-compliant, L20.4x4C drawing) with exposed thermal pad (EPAD) connected to PGND for enhanced thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LX2 | Inductor connection (output side); carries bidirectional current during buck/boost transitions. |
| 3 | PGND | Power ground return for high di/dt switching currents; must be low-inductance plane under EPAD. |
| 4, 5 | LX1 | Inductor connection (input side); shares same inductor node as LX2 in 4-switch topology. |
| 6–9 | PVIN | Main power input (1.8V–5.5V); supplies gate drivers and power FETs; requires 2×10µF ceramic decoupling. |
| 10 | VIN | Bias supply input (1.8V–5.5V); powers internal reference and control logic; independent of PVIN path. |
| 11 | EN | Enable logic input (VIH = 1.4V min); asserts internal soft-start sequence upon HIGH transition. |
| 12 | MODE | Mode select: HIGH = auto-PFM (light-load efficiency), LOW = forced PWM (fixed frequency, low noise). |
| 13, 14 | SGND | Analog ground reference for FB, error amp, and internal VREF; must be isolated from PGND except at single point. |
| 15 | FB | Feedback input for adjustable output; 0.8V nominal reference; 20nA bias current enables high-R divider networks. |
| 16 | NC | No-connect pin; must remain unconnected per datasheet. |
| 17–20 | VOUT | Regulated output; four parallel pins reduce IR drop and improve current sharing; requires 2×22µF ceramic output capacitance. |
| EPAD | Thermal Pad | Exposed copper pad on underside; must be soldered to solid PGND plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Buck-Boost Mode Transition | Seamless crossover when PVIN ≈ VOUT eliminates output glitches and ripple spikes during battery sag. |
| 4-Switch Synchronous Architecture | Eliminates external diodes; achieves >90% efficiency down to 10mA load via ultra-low RDS(ON) FETs (32/37mΩ). |
| Programmable Operating Mode | MODE pin selects between high-efficiency PFM (30µA IQ) or low-noise forced PWM (2.5MHz fixed). |
| Integrated Soft-Discharge | 120Ω internal pull-down activated on EN LOW discharges VOUT safely without external circuitry. |
| Robust Protection Suite | Short-circuit foldback, thermal shutdown (155°C), UVLO (1.725V), and reverse-current blocking prevent system faults. |
Applications
| Smartphone Brownout Protection | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Maintains stable 3.3V system rail during Li-ion battery discharge from 4.2V to 2.8V, preventing processor resets. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying SoC, memory, and display interface. Use Value: Eliminates brownout-induced firmware crashes by sustaining regulated output even when battery drops below nominal VOUT. | Use Scenario: Powers multi-sensor acquisition module (ECG, SpO₂, temperature) in handheld diagnostic device. IC Role / Device Role / Timing Role: Central power management IC delivering clean, low-noise 1.8V and 3.3V rails from single-cell battery. Use Value: 30µA quiescent current extends battery life beyond 72 hours in standby; PFM mode minimizes sleep-state power loss. |
| 2G/3G/4G RF Power Amplifier Supply | Tablet PC Core Logic Rail |
Use Scenario: Supplies dynamic voltage to cellular PA requiring 3.0V–4.2V under varying transmit power levels. IC Role / Device Role / Timing Role: Adaptive voltage regulator responding to baseband commands via MODE pin synchronization. Use Value: 2.5MHz switching enables compact 1µH inductor; fast load transient response (<100µs) prevents PA gain droop during burst transmission. | Use Scenario: Provides main 3.3V logic rail for application processor and LPDDR interface in thin tablet design. IC Role / Device Role / Timing Role: High-current buck-boost converter supporting deep-sleep wake-up and burst compute loads. Use Value: 2A continuous capability handles CPU turbo bursts; thermal shutdown (155°C) prevents throttling during sustained video playback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GL-Z | 4-switch architecture, 2.2MHz fSW, 3A rating, but higher IQ (55µA) and no MODE pin sync capability. | Supports higher peak current but lacks programmable PFM/PWM mode; less suitable for ultra-low-power sleep states. | Choose MP2918GL-Z only if >2A peak current is required and MODE pin synchronization is unnecessary. |
| TPS63802DLAR | 4-switch buck-boost, 2.5MHz fSW, 2A rating, 17µA IQ, but fixed 3.3V output only (no adjustable version). | Optimized for fixed-output systems; cannot replace ISL91127IRAZ-T7A in designs requiring 1.0V–5.2V programmability. | Select TPS63802DLAR only for cost-sensitive 3.3V-only applications where external feedback is not needed. |
Compared with MP2918GL-Z and TPS63802DLAR, the ISL91127IRAZ-T7A uniquely balances ultra-low quiescent current (30µA), full output adjustability (1.0V–5.2V), and MODE pin flexibility - making it optimal for battery-constrained, multi-rail, and dynamically scaled systems.
Availability
ISL91127IRAZ-T7A is available at Aetrix Electronics and suitable for handheld consumer electronics, portable medical diagnostics, wireless communication modules, and tablet PC power management requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for ISL91127IRAZ-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 management, and timing solutions for automotive, industrial, and IoT applications.
The ISL91127IR product line was designed specifically for high-efficiency, wide-input-range power conversion in advanced battery-powered devices - emphasizing seamless buck-boost transitions, minimal quiescent power, and robust protection for mission-critical portable systems.
FAQ
What output voltage range does the ISL91127IRAZ-T7A support?
The ISL91127IRAZ-T7A supports an adjustable output voltage range from 1.0V to 5.2V, set using an external resistor divider on the FB pin. Its internal 0.8V reference and 20nA FB bias current allow high-value resistors (e.g., 1MΩ/324kΩ for 3.3V), minimizing divider current loss. Fixed-output variants (3.3V/3.5V) are also available, but ISL91127IRAZ-T7A is the adjustable version.
How does the ISL91127IRAZ-T7A handle input voltages near the output voltage?
The ISL91127IRAZ-T7A uses Renesas' proprietary 4-switch buck-boost algorithm to automatically and seamlessly transition between buck and boost modes when PVIN approaches VOUT. This avoids output voltage dips or spikes and maintains <±2% regulation accuracy with very low ripple - critical for maintaining stability during battery voltage sag in portable systems.
What is the purpose of the separate PVIN and VIN pins on the ISL91127IRAZ-T7A?
PVIN supplies power to the high-current switching FETs and gate drivers, while VIN powers the internal analog reference, error amplifier, and control logic. This separation prevents noise coupling from switching transients into sensitive analog circuits, improving regulation accuracy and light-load efficiency. Both accept 1.8V–5.5V, but VIN must remain stable for proper VREF operation.
Does the ISL91127IRAZ-T7A include short-circuit protection?
Yes, the ISL91127IRAZ-T7A provides short-circuit protection by continuously monitoring the FB pin voltage. When FB falls below a threshold indicating output collapse, the controller reduces switching frequency and maintains P-channel MOSFET peak current limiting (4.5A typ) to prevent thermal runaway. Recovery is automatic once the fault clears and soft-start reinitiates.
What is the thermal performance of the ISL91127IRAZ-T7A in its QFN package?
The ISL91127IRAZ-T7A in its 20-lead 4mm×4mm QFN package has θJA = 40°C/W (typ) and θJC = 5°C/W (typ). With proper PCB layout - including full EPAD soldering to a solid PGND plane and adequate copper area - it sustains 2A continuous output at +85°C ambient without derating. Thermal shutdown activates at 155°C (typ) with 30°C hysteresis for reliable recovery.
ISL91127IRAZ-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:
- 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-T7A FAQ
1.How can I place an order for ISL91127IRAZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91127IRAZ-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 ISL91127IRAZ-T7A reliable?
The price and inventory of ISL91127IRAZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91127IRAZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91127IRAZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91127IRAZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91127IRAZ-T7A?
ISL91127IRAZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91127IRAZ-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 ISL91127IRAZ-T7A?
For technical support, including ISL91127IRAZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91127IRAZ-T7A requirements.
6.How does Aetrix verify that ISL91127IRAZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91127IRAZ-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 ISL91127IRAZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91127IRAZ-T7A?
All ISL91127IRAZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91127IRAZ-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 ISL91127IRAZ-T7A part is unused and in its original packaging.
Return procedure for ISL91127IRAZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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