My Inquiry
My Account
Renesas ISL91127IIAZ-T7A
- Part No.:
- ISL91127IIAZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
ISL91127IIAZ-T7A.pdf
- Description:
- IC REG BUCK BOOST 2.1A 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,011
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL91127IIAZ-T7A from Renesas Electronics is a high-efficiency, fully synchronous 4-switch buck-boost DC/DC regulator designed for single-cell Li-ion battery systems. It delivers up to 2A continuous output current at 3.3V across 2.5V–4.35V input, features 2.5MHz switching frequency, 30µA quiescent current, and supports adjustable output voltage from 1.0V to 5.2V via external resistor divider. It enables brownout-free system operation in smartphones and medical handhelds.
For engineers reviewing the ISL91127IIAZ-T7A datasheet, ISL91127IIAZ-T7A pinout, ISL91127IIAZ-T7A application, or ISL91127IIAZ-T7A equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, and real-world application mapping - all specific to the ISL91127IIAZ-T7A adjustable-output variant in 4×4mm QFN.
Technical Context
The ISL91127IIAZ-T7A implements a proprietary buck-boost algorithm that automatically and seamlessly transitions between buck and boost modes as input voltage crosses the regulated output level. Its 4-switch synchronous architecture uses low-RDS(ON) P-channel (32mΩ) and N-channel (37mΩ) MOSFETs to minimize conduction loss across wide VIN–VOUT differentials.
It operates in either forced PWM or auto PFM mode (controlled by MODE pin), achieving up to 96% peak efficiency and maintaining <±0.4mV/mA load regulation in PFM mode. Internal soft-start (1–3ms depending on mode), thermal shutdown (155°C), short-circuit protection, and reverse-current blocking ensure robust operation in portable power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | 4-switch synchronous buck-boost - enables regulation when VIN is above, below, or near VOUT without manual mode selection. |
| Output Voltage Range | 1.0V to 5.2V (adjustable via FB pin and external resistor divider - supports custom rail generation). |
| Max Continuous Output Current | 2A at VOUT = 3.3V with PVIN = 2.5V - sustains full load down to low battery voltages, maximizing usable cell capacity. |
| Switching Frequency | 2.5MHz (typical) - allows use of compact 1µH inductors and small ceramic capacitors (2×10µF input, 2×22µF output). |
| Quiescent Current | 30µA in PFM mode - extends battery runtime during light-load standby in always-on subsystems. |
| Input Voltage Range | 1.8V to 5.5V - accommodates single-cell Li-ion (2.5–4.35V), Li-polymer, and USB-powered inputs. |
| Protection Features | Short-circuit, over-temperature (155°C shutdown), undervoltage lockout (1.795V rising threshold), and reverse-current blocking. |
Pinout & Package
ISL91127IIAZ-T7A is housed in a thermally enhanced 20-lead, 0.5mm pitch QFN package (4mm × 4mm, RoHS-compliant, L20.4x4C footprint). The exposed thermal pad (EPAD) must be soldered to PGND for optimal thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LX2 | Inductor connection (output side) - carries high-frequency AC current during both buck and boost phases. |
| 3 | PGND | Power ground - return path for high-switching-current loops; must be low-inductance and directly connected to EPAD. |
| 4, 5 | LX1 | Inductor connection (input side) - completes the 4-switch H-bridge topology with LX2 for bidirectional energy transfer. |
| 6–9 | PVIN | Main power input (1.8–5.5V) - supplies energy to internal switches; requires 2×10µF X5R ceramic decoupling to PGND. |
| 10 | VIN | Analog supply input - powers internal reference and control circuitry; separate from PVIN to reduce noise coupling. |
| 11 | EN | Enable logic input (VIH = 1.4V, VIL = 0.4V) - asserts device startup; pulling LOW activates soft-discharge (120Ω internal pull-down to GND). |
| 12 | MODE | Mode control - HIGH selects auto PFM for light-load efficiency; LOW forces PWM for fixed-frequency stability; also accepts sync clock (2.75–3.25MHz). |
| 13, 14 | SGND | Analog ground - reference for FB, error amplifier, and internal references; must be star-connected to PGND at single point. |
| 15 | FB | Feedback input - senses divided output voltage; 0.800V nominal reference; 20nA bias current enables high-value resistor dividers (e.g., 1MΩ/324kΩ for 3.3V). |
| 16 | NC | No-connect - must remain unconnected per datasheet; no internal connection or function. |
| 17–20 | VOUT | Regulated output - delivers up to 2A; requires 2×22µF X5R ceramic output capacitance tied to PGND for low ripple and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Seamless crossover at VIN ≈ VOUT eliminates output glitches and maintains regulation without external control logic. |
| Low-quiescent-current PFM mode | 30µA IQ enables >100-hour standby in battery-powered devices with 100µA system loads. |
| Integrated soft-discharge | 120Ω internal discharge path on EN deassertion prevents floating VOUT and simplifies sequencing in multi-rail systems. |
| High-accuracy feedback reference | 0.800V ±1.5% reference with 20nA input bias allows precise output programming using 1% resistors and minimal board area. |
| Thermal and fault protection | 155°C thermal shutdown with 30°C hysteresis and cycle-by-cycle current limiting prevent damage under overload or PCB thermal stress. |
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. IC Role / Device Role / Timing Role: Primary buck-boost regulator supplying SoC I/O, memory, and interface peripherals. Use Value: Eliminates brownouts during deep discharge, extending usable battery life by >15% versus fixed-buck solutions. |
Use Scenario: Powering analog front-end, display driver, and Bluetooth LE radio from a compact 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Single-chip power solution delivering 1.8V, 3.3V, and 5.0V rails via cascaded configurations. Use Value: Reduces BOM count by replacing three LDOs or discrete converters while sustaining >92% efficiency at 100mA–1.5A loads. |
| Tablet PC Core Logic Supply | Wireless Earbud Charging Case |
Use Scenario: Providing clean 1.1V core voltage to application processor across wide input range (3.0–4.4V). IC Role / Device Role / Timing Role: High-efficiency intermediate regulator feeding downstream point-of-load converters. Use Value: Achieves <15mVpp output ripple at 2.5MHz, avoiding interference with sensitive RF and audio subsystems. |
Use Scenario: Regulating 3.3V output from variable 3.4–4.2V battery during charging and playback cycles. IC Role / Device Role / Timing Role: Bidirectional-capable regulator supporting both battery-to-system and system-to-battery charge paths. Use Value: Enables reverse-current blocking and seamless transition between charge and discharge states without external MOSFETs. |
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) | 4-switch topology, 2A rating, but fixed 3.3V/5V outputs only; no adjustable version; 1.2MHz max fSW. | Not suitable for designs requiring programmable VOUT < 3.3V or > 5.0V; lower switching frequency increases inductor size. | Select MP2964GQ-Z only if fixed output and cost sensitivity outweigh flexibility needs. |
| TPS63802DLAR (Texas Instruments) | Adjustable 1.2–5.5V output, 2A capability, 2.4MHz fSW, but lacks integrated soft-discharge and has higher 50µA IQ. | Acceptable for general-purpose buck-boost, but less optimal for ultra-low-power standby or strict sequencing requirements. | Choose TPS63802DLAR when TI ecosystem alignment or dual-phase support is prioritized over lowest IQ and integrated discharge. |
Compared with MP2964GQ-Z and TPS63802DLAR, the ISL91127IIAZ-T7A uniquely combines adjustable output (1.0–5.2V), 30µA quiescent current, integrated soft-discharge, and seamless mode transition - making it optimal for space-constrained, battery-sensitive applications demanding design flexibility and long standby life.
Availability
ISL91127IIAZ-T7A is available at Aetrix Electronics and suitable for smartphone system rails, portable medical monitors, tablet PC core logic supplies, and wireless earbud charging cases requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for ISL91127IIAZ-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 consumer applications.
The ISL91127 family was engineered specifically for advanced single-cell battery systems requiring high efficiency across wide VIN–VOUT differentials - targeting next-generation mobile, medical, and IoT edge devices where energy density and reliability are critical.
FAQ
What output voltage range does the ISL91127IIAZ-T7A support?
The ISL91127IIAZ-T7A supports an adjustable output voltage range from 1.0V to 5.2V, set via an external resistor divider connected to the FB pin. Its internal 0.800V reference enables precise programming - for example, 3.3V output using R1 = 1MΩ and R2 = 324kΩ. This range covers common logic, interface, and analog supply requirements in portable electronics.
How does the ISL91127IIAZ-T7A handle input voltages near the output voltage?
The ISL91127IIAZ-T7A uses Renesas' proprietary buck-boost algorithm to automatically and seamlessly alternate between buck and boost modes when PVIN approaches VOUT. This ensures continuous regulation with minimal output voltage ripple (<15mVpp typical) and avoids discontinuities or dropout - critical for maintaining stable operation in Li-ion battery systems discharging from 4.2V to 2.8V.
What is the purpose of the MODE pin on the ISL91127IIAZ-T7A?
The MODE pin on the ISL91127IIAZ-T7A controls operating mode: driven HIGH for auto PFM (maximizing light-load efficiency), LOW for forced PWM (ensuring fixed-frequency stability), or used as a synchronization input for external clocks (2.75–3.25MHz). This flexibility allows designers to optimize for battery life, EMI, or system-level timing coordination without changing hardware.
Does the ISL91127IIAZ-T7A include reverse-current protection?
Yes, the ISL91127IIAZ-T7A includes integrated reverse-current blocking - preventing current flow from VOUT back to PVIN when the input is removed or falls below the output voltage. This eliminates the need for external Schottky diodes or MOSFETs in battery backup or multi-source power architectures, reducing BOM cost and PCB area.
What thermal management features does the ISL91127IIAZ-T7A provide?
The ISL91127IIAZ-T7A incorporates thermal shutdown at 155°C (typical) with 30°C hysteresis, allowing automatic recovery at 125°C. Its 4×4mm QFN package features an exposed thermal pad (EPAD) that must be soldered to PGND for effective heat dissipation. With θJA = 40°C/W and θJC = 5°C/W, it sustains 2A output in ambient temperatures up to +85°C when properly laid out.
ISL91127IIAZ-T7A 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)
ISL91127IIAZ-T7A FAQ
1.How can I place an order for ISL91127IIAZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91127IIAZ-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 ISL91127IIAZ-T7A reliable?
The price and inventory of ISL91127IIAZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91127IIAZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL91127IIAZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91127IIAZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91127IIAZ-T7A?
ISL91127IIAZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91127IIAZ-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 ISL91127IIAZ-T7A?
For technical support, including ISL91127IIAZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91127IIAZ-T7A requirements.
6.How does Aetrix verify that ISL91127IIAZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL91127IIAZ-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 ISL91127IIAZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL91127IIAZ-T7A?
All ISL91127IIAZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL91127IIAZ-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 ISL91127IIAZ-T7A part is unused and in its original packaging.
Return procedure for ISL91127IIAZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL91127IIAZ-T7A 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…
