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Renesas ISL9122AIRNZ-T7A
- Part No.:
- ISL9122AIRNZ-T7A
- Manufacturer:
- Renesas
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL9122AIRNZ-T7A.pdf
- Description:
- IC REG BUCK BOOST ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:327
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Product details
Overview
ISL9122AIRNZ-T7A from Renesas Electronics is a non-inverting buck-boost switching regulator with adaptive hysteretic control, delivering up to 500mA output current (VIN > VOUT > 2.5V), 1300nA quiescent current in regulation mode, and I²C-adjustable output voltage from 1.8V to 5.375V. It operates across 1.8V–5.5V input and supports seamless buck/boost/bypass transitions for wearable power management.
For engineers reviewing the ISL9122AIRNZ-T7A datasheet, ISL9122AIRNZ-T7A pinout, ISL9122AIRNZ-T7A application, or ISL9122AIRNZ-T7A equivalent, key selection criteria include ultra-low IQ operation, automatic bypass near VIN ≈ VOUT, forced bypass via I²C, hysteretic PWM/PFM modulation, and WLCSP package compatibility with space-constrained IoT and medical devices.
Technical Context
The ISL9122AIRNZ-T7A implements a dual-phase buck-boost topology with integrated P/N-channel MOSFETs (rDSON_A ≤ 52mΩ, rDSON_C ≤ 51mΩ) and zero-crossing detection to enable smooth mode transitions without output disturbance. Its hysteretic controller dynamically adjusts switching frequency (up to 2.5MHz in forced PWM) based on load and input conditions.
I²C interface (Fast Mode, 400kHz) enables real-time VOUT adjustment, soft-discharge activation (160Ω internal resistor), and forced bypass mode selection-while EN pin controls full enable/disable with 50µs minimum assertion time. Thermal shutdown triggers at 130°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-poly, or multi-cell alkaline battery inputs without external pre-regulation. |
| Output Voltage Range | 1.8V to 5.375V - programmable in 12.5mV steps via I²C, enabling precise rail matching for mixed-voltage SoCs. |
| Max Output Current | 500mA (VIN > VOUT > 2.5V) - sufficient for RF transceivers, sensors, and low-power microcontrollers in compact wearables. |
| Quiescent Current | 1300nA in regulation - extends battery life in always-on monitoring applications like smart watches and hearing aids. |
| Efficiency | 97% peak (VIN=3.6V, VOUT=3.3V) and 84% at 10µA load - maintains high efficiency across 5-decade load range. |
| Switching Control | Hysteretic PWM/PFM - eliminates external compensation, reduces component count, and ensures fast transient response. |
| Protection Features | Overcurrent (2.5A peak limit), thermal shutdown (130°C), undervoltage lockout (1.79V), and hiccup-mode fault recovery. |
Pinout & Package
ISL9122AIRNZ-T7A uses an 8-bump WLCSP package (1.8mm × 1.0mm, 0.4mm pitch) with exposed pad for thermal dissipation. Pin assignments are validated per Renesas FN8947 Rev.1.03, Page 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 1.8V–5.5V; connects to input capacitor (min 5µF) and battery or source rail. |
| VOUT | Buck-boost regulated output | Delivers stable output; requires ≥6µF effective capacitance (e.g., 22µF/0603 ceramic). |
| LX1 | Inductor connection (input side) | Switch node for buck phase; connects to one end of 1µH/0603 inductor. |
| LX2 | Inductor connection (output side) | Switch node for boost phase; connects to second end of same inductor. |
| GND | Ground reference | Common return path; must be connected to PCB ground plane and EPAD. |
| EN | Enable logic input | Active-high; drive ≥1.6V to enable; must not float; disables I²C when LOW. |
| SCL | I²C clock input | Fast Mode (400kHz); requires pull-up to VDD_I2C (≤3.6V); max 400pF bus loading. |
| SDA | I²C data input/output | Open-drain; requires pull-up; supports read/write of VSET, CONV_CFG, and INTFLG registers. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ regulation | 1300nA enables >1-year battery life in 10µA-average IoT endpoints (e.g., gas meters). |
| Auto & forced bypass modes | Eliminates switching losses when |VIN − VOUT| < ±1%×VOUT; forced bypass reduces IQ to 120nA. |
| Single-inductor architecture | Uses one 0603-size inductor (1µH) - cuts BOM cost and board area vs. dual-inductor buck-boost solutions. |
| I²C-configurable soft-start | Ramp rate adjustable from 0.78 to 6.25 mV/µs - prevents inrush current during cold boot or dynamic voltage scaling. |
| Integrated soft-discharge | 160Ω internal resistor discharges VOUT safely when disabled via I²C - avoids external discharge circuitry. |
| Hiccup-mode OCP | 100ms fault wait time after overcurrent - protects against short circuits while allowing auto-recovery. |
Applications
| Smart Wearables | Wireless Audio |
|---|---|
|
Use Scenario: Powering ultra-thin smartwatches with variable battery voltage (3.0–4.2V) and multiple rails (1.8V sensor, 3.3V MCU, 5.0V display backlight). IC Role / Device Role / Timing Role: Primary buck-boost regulator managing dynamic load shifts between sleep and active states. Use Value: Seamless buck/boost/bypass transitions prevent output droop during battery sag, extending usable runtime by 18% vs. fixed-topology regulators. |
Use Scenario: Supplying Bluetooth LE earbuds with 3.7V Li-ion cells and 1.2V DSP + 3.3V radio requirements. IC Role / Device Role / Timing Role: Single-rail converter delivering 3.3V at up to 500mA peak during RF transmission bursts. Use Value: 97% peak efficiency and 1300nA IQ reduce thermal rise and extend playback time to 8+ hours per charge. |
| IoT Sensor Nodes | Portable Medical Devices |
|
Use Scenario: Powering NB-IoT water/gas meter modules operating from 2xAA alkaline (1.8–3.2V) with 3.3V MCU and 1.8V sensor interface. IC Role / Device Role / Timing Role: Input-flexible regulator maintaining stable 3.3V output as battery depletes below nominal voltage. Use Value: Auto-bypass near end-of-life (VIN ≈ 1.8V) sustains regulation down to 1.79V UVLO threshold, adding 20% usable battery capacity. |
Use Scenario: Driving low-noise analog front-ends and BLE radios in hearing aids powered by zinc-air batteries (1.4–1.5V nominal). IC Role / Device Role / Timing Role: High-efficiency step-up converter generating 1.8V and 3.3V rails from sub-1.5V input. Use Value: 84% efficiency at 10µA load preserves battery energy during long standby periods, enabling 14-day operation on single cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLCT | Higher IQ (2.5µA), fixed 3.3V/5.0V options only; no I²C interface; 2.5mm × 2.5mm DFN package. | Best for cost-sensitive, fixed-output designs where programmability and ultra-low IQ are secondary. | Select TPS63802DLCT if I²C control and sub-2µA IQ are unnecessary and board space allows larger DFN. |
| MAX77654EWL+T | Triple-output PMIC (buck + 2 boost); 1.2µA IQ; I²C-programmable; 2.1mm × 1.6mm WLP package. | Suitable for multi-rail SoC systems needing coordinated power sequencing and tighter integration. | Choose MAX77654EWL+T when powering complex MCUs with independent core/I/O/peripheral rails in same footprint. |
Compared with TPS63802DLCT and MAX77654EWL+T, the ISL9122AIRNZ-T7A uniquely balances ultra-low IQ (1300nA), full I²C configurability, and minimal 1.8mm × 1.0mm WLCSP size-making it optimal for single-rail, space-constrained, battery-critical applications where dynamic voltage scaling and extended shelf life matter.
Availability
ISL9122AIRNZ-T7A is available at Aetrix Electronics and suitable for smart wearables, wireless audio devices, and portable medical equipment requiring stable component supply and long-term lifecycle support.
Supply support for ISL9122AIRNZ-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 connectivity solutions for automotive, industrial, and IoT markets.
The ISL9122A belongs to Renesas' ultra-low-power DC/DC regulator product line, engineered specifically for battery-powered edge devices demanding nanoscale quiescent current and adaptive conversion efficiency.
FAQ
What is the minimum input voltage required for ISL9122AIRNZ-T7A to start regulation?
The ISL9122AIRNZ-T7A has an undervoltage lockout (UVLO) threshold of 1.79V with 40mV hysteresis. Regulation begins when VIN rises above 1.79V and the EN pin is asserted high. Below this, the device remains disabled regardless of EN state. This ensures reliable startup from partially discharged single-cell batteries.
Can ISL9122AIRNZ-T7A operate with only two external components?
Yes - the ISL9122AIRNZ-T7A requires only one 0603 inductor (1µH) and two capacitors (≥5µF input, ≥6µF output) for full operation. No external compensation network, feedback resistors, or diodes are needed due to its integrated hysteretic controller and internal voltage reference.
How does the forced bypass mode affect ISL9122AIRNZ-T7A's output regulation?
In forced bypass mode (enabled via I²C register FMODE = 0x3), the ISL9122AIRNZ-T7A disconnects switching elements and passes VIN directly to VOUT through internal MOSFETs. Output voltage equals VIN minus small conduction drop (typically <50mV at 100mA), so regulation is lost - this mode is intended for temporary power saving when precise VOUT is not required.
What is the maximum supported I²C clock frequency for ISL9122AIRNZ-T7A?
The ISL9122AIRNZ-T7A supports Fast Mode I²C up to 400kHz, as specified in Section 3.5 of the datasheet. SCL/SDA timing parameters (e.g., tLOW ≥1300ns, tHIGH ≥600ns) are guaranteed across -40°C to +85°C ambient temperature and require ≤400pF total bus capacitance.
Does ISL9122AIRNZ-T7A provide output discharge capability when disabled?
Yes - when disabled via I²C (not EN pin), the ISL9122AIRNZ-T7A activates an internal 160Ω discharge resistor between VOUT and GND. This soft-discharge function prevents floating outputs and residual voltage hazards in safety-critical medical or industrial systems.
ISL9122AIRNZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.375V
- Current - Output:
- 500mA
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
ISL9122AIRNZ-T7A FAQ
1.How can I place an order for ISL9122AIRNZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9122AIRNZ-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 ISL9122AIRNZ-T7A reliable?
The price and inventory of ISL9122AIRNZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9122AIRNZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9122AIRNZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9122AIRNZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9122AIRNZ-T7A?
ISL9122AIRNZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9122AIRNZ-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 ISL9122AIRNZ-T7A?
For technical support, including ISL9122AIRNZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9122AIRNZ-T7A requirements.
6.How does Aetrix verify that ISL9122AIRNZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9122AIRNZ-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 ISL9122AIRNZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9122AIRNZ-T7A?
All ISL9122AIRNZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9122AIRNZ-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 ISL9122AIRNZ-T7A part is unused and in its original packaging.
Return procedure for ISL9122AIRNZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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