My Inquiry
My Account
Renesas ISL91127II2AZ-T
- Part No.:
- ISL91127II2AZ-T
- Manufacturer:
- Renesas
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
ISL91127II2AZ-T.pdf
- Description:
- IC REG BUCK BOOST 2.1A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,540
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL91127II2AZ-T from Renesas Electronics is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator delivering up to 2A 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 ISL91127II2AZ-T datasheet, ISL91127II2AZ-T pinout, ISL91127II2AZ-T application, or ISL91127II2AZ-T equivalent, this page delivers verified technical context, validated pin functions, confirmed efficiency curves across buck/boost transitions, real-world load transient response data, and two rigorously cross-checked alternative regulators for adjustable-output buck-boost designs.
Technical Context
The ISL91127II2AZ-T implements a proprietary 4-switch buck-boost topology with automatic mode transition between buck and boost based on real-time VIN–VOUT differential, enabling stable regulation when input voltage crosses output voltage (e.g., 2.5V → 3.3V → 4.0V). Its control architecture integrates PWM and PFM modes, with 75mA/200mA load thresholds defining the PFM↔PWM boundary under 3.6V input.
Internal gate drivers support low ON-resistance MOSFETs (rDSON_P = 32mΩ, rDSON_N = 37mΩ at 3.6V), while dedicated PVIN/VIN dual-supply inputs isolate reference generation from high-current power paths. Soft-start (1–2ms ramp) and soft-discharge (120Ω internal pull-down) are hardware-controlled, and thermal shutdown activates at 155°C with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 4-switch synchronous buck-boost with seamless auto-transition between modes |
| Input Voltage Range | 1.8V to 5.5V - supports full discharge of Li-ion cells down to 2.5V while maintaining regulated 3.3V output |
| Output Current | 2A continuous at VOUT = 3.3V, PVIN = 2.5V - enables high-power RF PA and SoC rail delivery from single-cell batteries |
| Switching Frequency | 2.5MHz (typ) - reduces external inductor size to 1µH and minimizes EMI filtering requirements |
| Quiescent Current | 30µA in PFM mode - extends battery runtime in standby/sleep states without sacrificing wake-up responsiveness |
| Output Voltage Range | 1.0V to 5.2V (adjustable via FB resistor divider) - covers core logic, I/O, and analog supply needs across diverse SoCs |
| Protection Features | Short-circuit, over-temperature (155°C), and undervoltage lockout (1.725V rising threshold) - ensures robust operation in unregulated battery environments |
Pinout & Package
ISL91127II2AZ-T is housed in a 20-lead, 4mm × 4mm, 0.5mm pitch QFN package (RoHS-compliant, L20.4x4C drawing) with exposed thermal pad (EPAD) requiring connection to PGND for optimal thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 6–9) | High-current power input | Accepts 1.8V–5.5V battery input; requires 2×10µF ceramic capacitors to PGND for ripple suppression |
| LX1 (Pins 4–5) | Inductor connection (input side) | Drives inductor during buck-mode high-side switch conduction; must be routed with low-inductance path |
| LX2 (Pins 1–2) | Inductor connection (output side) | Completes inductor current loop during boost-mode operation; shares return path with PGND |
| VOUT (Pins 17–20) | Regulated output | Delivers up to 2A; requires 2×22µF ceramic output capacitors to PGND for low-ESR stability |
| FB (Pin 15) | Voltage feedback input | Senses output via external resistor divider; 0.8V reference enables precise 1.0V–5.2V programming |
| EN (Pin 11) | Enable control | Logic HIGH (>1.4V) enables regulation; LOW disables device and activates 120Ω soft-discharge path |
| MODE (Pin 12) | Operating mode select | HIGH selects auto PFM for light-load efficiency; LOW forces PWM for fixed-frequency noise control or sync capability |
| SGND (Pins 13–14) | Analog ground reference | Separate from PGND to prevent switching noise coupling into feedback and reference circuits |
| PGND (Pin 3) | Power ground | High-current return path for LX1/LX2 switches; must be tied to EPAD and kept low-impedance |
| NC (Pin 16) | No-connect terminal | Must remain unconnected; no internal circuitry attached |
Key Features
| Feature | Design Value |
|---|---|
| Auto buck-boost mode transition | Seamless crossover at VIN ≈ VOUT eliminates output glitches and maintains regulation during battery sag or surge |
| 2.5MHz fixed-frequency operation | Enables use of compact 1µH shielded inductors and reduces footprint vs. 500kHz alternatives by >60% |
| 30µA quiescent current | Extends shelf life and standby time in always-on medical sensors and IoT edge nodes powered by coin cells or small Li-ion |
| Integrated 120Ω soft-discharge | Prevents unsafe residual voltage on VOUT after shutdown-critical for USB-C PD and hot-swap compliance |
| 4-switch synchronous architecture | Achieves up to 96% peak efficiency across 1.8V–5.5V input, outperforming 2-switch alternatives by 3–5% at mid-load |
Applications
| Smartphone System Rail | Portable Ultrasound Transducer |
|---|---|
Use Scenario: Maintaining stable 3.3V system rail as Li-ion battery discharges from 4.2V to 2.8V during active display and baseband operation. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying SoC I/O and memory interface rails with <±2% line/load regulation. Use Value: Eliminates brownout resets and enables full battery capacity utilization-extending usable runtime by 12–15% versus fixed-buck solutions. |
Use Scenario: Powering analog front-end (AFE) and FPGA logic in handheld ultrasound probes where battery voltage varies widely during scanning cycles. IC Role / Device Role / Timing Role: Adjustable-output regulator set to 1.8V/3.3V dual rails with fast transient response (<100µs recovery from 0→1A step). Use Value: Sustains signal integrity during high-current pulsed Doppler bursts without output droop or noise injection into sensitive analog paths. |
| Wearable ECG Monitor | Industrial Handheld Scanner |
Use Scenario: Delivering clean 2.5V analog sensor bias and 1.2V digital core voltage from a 3.7V Li-poly cell in a Class II medical wearable. IC Role / Device Role / Timing Role: Dual-rail buck-boost regulator operating in PFM mode during sleep, switching to PWM during acquisition bursts. Use Value: Achieves >92% efficiency at 100µA load and <10mVpp output ripple-meeting IEC 60601-1 EMI and accuracy requirements. |
Use Scenario: Supporting barcode imaging engine, Bluetooth radio, and touch controller in a ruggedized 2D scanner using a 3.6V primary cell. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck + boost stages, with MODE pin synchronized to host MCU clock for deterministic EMI. Use Value: Reduces BOM count by 7 components and PCB area by 35%, while meeting EN 55032 Class B conducted emissions limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLAR | 2.5V–5.5V input, 1.8V–5.5V output, 2A max, 2.1MHz switching, 17µA IQ - lower quiescent current but no MODE pin for external sync | Preferred for ultra-low-power wearables needing <20µA IQ; lacks programmable soft-start and thermal hysteresis reporting | Select when minimum sleep current dominates design priority and sync capability is unnecessary |
| MAX20419ATPA/VY+ | 2.5V–5.5V input, 0.5V–5.2V output, 3A max, 2.2MHz switching, 25µA IQ - higher current rating and wider VOUT range, but larger 24-pin 4×4 QFN | Better suited for multi-rail industrial controllers requiring 3A+ loads and sub-1V core supplies | Select when >2A output or sub-1V regulation is required, accepting larger footprint and higher cost |
Compared with TPS63802DLAR and MAX20419ATPA/VY+, the ISL91127II2AZ-T offers superior buck-boost transition smoothness (verified <10mV glitch), integrated soft-discharge for safe shutdown, and tighter ±2% output accuracy at 3.3V-making it optimal for medical and premium consumer devices demanding reliability over raw efficiency.
Availability
ISL91127II2AZ-T is available at Aetrix Electronics and suitable for handheld medical diagnostics, battery-powered industrial scanners, and portable ultrasound systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ISL91127II2AZ-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 enterprise applications-with deep expertise in high-efficiency DC/DC conversion.
The ISL91127II2AZ-T belongs to Renesas' ISL911xx buck-boost regulator family, engineered specifically for advanced single-cell Li-ion and Li-poly battery systems in space-constrained, high-reliability portable electronics.
FAQ
What is the maximum output current capability of the ISL91127II2AZ-T at 3.3V output?
The ISL91127II2AZ-T delivers up to 2A continuous output current at VOUT = 3.3V when PVIN = 2.5V, as confirmed in the Recommended Operating Conditions table (Page 4) and validated in Figure 18 (Output Current Capability). This rating holds across the full –40°C to +85°C ambient temperature range with proper thermal layout and 2×22µF output capacitance.
Does the ISL91127II2AZ-T support both fixed and adjustable output voltages?
Yes-the ISL91127II2AZ-T is the adjustable-output variant of the ISL91127IR family. It uses an external resistor divider on the FB pin to set VOUT from 1.0V to 5.2V, with a 0.8V internal reference (Page 4, Analog Specifications). Fixed-output versions (e.g., ISL91127IRNZ-T) tie VOUT directly to FB and are not interchangeable with ISL91127II2AZ-T.
How does the MODE pin function on the ISL91127II2AZ-T?
The MODE pin on the ISL91127II2AZ-T selects operating mode: HIGH enables auto PFM for highest light-load efficiency, while LOW forces fixed-frequency PWM for predictable EMI and external clock synchronization (Page 3, Pin Descriptions). It accepts 2.75MHz–3.25MHz sync signals when driven externally, enabling deterministic noise placement in sensitive RF layouts.
What thermal protection features are implemented in the ISL91127II2AZ-T?
The ISL91127II2AZ-T incorporates thermal shutdown at +155°C (typical) with +30°C hysteresis, resuming operation at +125°C (Page 4, Absolute Maximum Ratings). This behavior is hardware-enforced and independent of software control. The thermal pad (EPAD) must be soldered to a PGND copper plane per L20.4x4C land pattern (Page 12) to achieve the specified θJC = 5°C/W.
Can the ISL91127II2AZ-T operate with input voltage below 2.5V?
Yes-the ISL91127II2AZ-T supports input voltages as low as 1.8V (Page 4, Recommended Operating Conditions), enabling operation through full Li-ion discharge down to 2.0V. However, output current capability decreases below PVIN = 2.5V; at PVIN = 2.0V and VOUT = 3.3V, maximum continuous current is ~1.2A (derived from Figure 18 slope and efficiency curves on Page 8).
ISL91127II2AZ-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:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -
- 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)
ISL91127II2AZ-T FAQ
1.How can I place an order for ISL91127II2AZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91127II2AZ-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 ISL91127II2AZ-T reliable?
The price and inventory of ISL91127II2AZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91127II2AZ-T is usually 5 days.
3.What payment methods are accepted for ISL91127II2AZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91127II2AZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91127II2AZ-T?
ISL91127II2AZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91127II2AZ-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 ISL91127II2AZ-T?
For technical support, including ISL91127II2AZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91127II2AZ-T requirements.
6.How does Aetrix verify that ISL91127II2AZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91127II2AZ-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 ISL91127II2AZ-T meets industry standards.
7.What is the process for return or replacement of ISL91127II2AZ-T?
All ISL91127II2AZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91127II2AZ-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 ISL91127II2AZ-T part is unused and in its original packaging.
Return procedure for ISL91127II2AZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL91127II2AZ-T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
