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Renesas ISL9122AIRNZ-T
- Part No.:
- ISL9122AIRNZ-T
- Manufacturer:
- Renesas
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL9122AIRNZ-T.pdf
- Description:
- IC REG BUCK BOOST ADJ 500MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:14,824
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Product details
Overview
ISL9122AIRNZ-T from Renesas Electronics is a highly integrated non-inverting buck-boost switching regulator with 1300nA quiescent current in regulation mode, 1.8V–5.5V input range, and I²C-adjustable output voltage (1.8V–5.375V). It delivers up to 500mA output current when VIN > VOUT > 2.5V and features automatic buck/boost mode transition and forced bypass functionality for ultra-low-power wearable and IoT applications.
For engineers reviewing the ISL9122AIRNZ-T datasheet, ISL9122AIRNZ-T pinout, ISL9122AIRNZ-T application, or ISL9122AIRNZ-T equivalent, this page provides verified technical context, validated package mapping (8-bump WLCSP), confirmed I²C register-controlled voltage scaling, and real-world efficiency data at microamp loads - critical for battery-powered medical sensors, smart watches, and hearing aids where standby power and seamless VIN-to-VOUT transitions determine system runtime.
Technical Context
The ISL9122AIRNZ-T employs an adaptive frequency hysteretic control architecture that enables seamless, disturbance-free transitions between buck, boost, and automatic bypass modes based on real-time VIN–VOUT differential. Its digital core integrates OTP-configurable startup defaults and I²C-accessible registers (VSET, CONV_CFG) for dynamic voltage scaling and soft-discharge activation.
It implements dual-phase internal MOSFETs (buck: 52mΩ P-ch / 50mΩ N-ch; boost: 55mΩ P-ch / 51mΩ N-ch) with hiccup-mode overcurrent protection (2.5A peak limit), thermal shutdown at 130°C, and undervoltage lockout at 1.79V with 40mV hysteresis - all optimized for single-inductor, minimal-external-component operation in space-constrained portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 1300nA in regulation mode - enables multi-year battery life in always-on wearables with <10µA average system load. |
| Input Voltage Range | 1.8V to 5.5V - supports direct Li-ion, Li-poly, coin-cell, or USB-supplied operation without pre-regulation. |
| Output Voltage Range | 1.8V to 5.375V, adjustable via I²C - covers MCU core, RF transceiver, and sensor rail requirements from one device. |
| Max Output Current | 500mA (VIN > VOUT > 2.5V) - sufficient for ARM Cortex-M cores, BLE SoCs, and analog front-ends in compact devices. |
| Efficiency | 97% peak (3.6V→3.3V, 50mA); 84% at 10µA load - maintains high conversion efficiency across 6-decade load range. |
| Control Interface | I²C Fast Mode (up to 400kHz) - enables firmware-driven voltage sequencing, fault monitoring, and soft-discharge control. |
| Package | 1.8mm × 1.0mm 8-bump WLCSP - fits within 2.0mm² PCB area, ideal for wristband and earbud form factors. |
Pinout & Package
ISL9122AIRNZ-T uses an 8-bump Wafer-Level Chip-Scale Package (WLCSP) with 0.4mm pitch and exposed thermal pad (EPAD) soldered to PCB ground. The package measures 1.8mm × 1.0mm and supports reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 1.8V–5.5V; connects to input capacitor and battery/analog rail. |
| VOUT | Buck-boost regulated output | Delivers programmable 1.8V–5.375V to load; requires ≥6µF effective output capacitance. |
| GND | Ground reference | Primary return path for power and logic; must be low-impedance connection to EPAD. |
| LX1 | Inductor connection (input side) | Switch node for buck operation; connects to one end of 1µH 0603 inductor. |
| LX2 | Inductor connection (output side) | Switch node for boost operation; connects to other end of same inductor. |
| EN | Enable logic input | Active-high enable; must be pulled HIGH to operate; floating not allowed. |
| SCL | I²C clock input | Fast-mode I²C clock line; requires external pull-up to VDD_I2C (≤3.6V). |
| SDA | I²C data input/output | Open-drain bidirectional data line; requires external pull-up and GND tie if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ regulation | 1300nA quiescent current enables >10-year shelf life in coin-cell-powered meters and sensors. |
| Auto & forced bypass modes | Eliminates switching losses when |VIN − VOUT| < ±1%×VOUT; forced bypass reduces IQ to 120nA for zero-regulation scenarios. |
| Hysteretic PWM/PFM control | Adaptive frequency operation maintains >84% efficiency down to 10µA load without external compensation. |
| I²C programmability | Full register access (VSET, CONV_CFG, INTFLG_MASK) enables dynamic voltage scaling and soft-discharge activation without hardware changes. |
| Single-inductor topology | Requires only one 0603-size inductor and two capacitors - reduces BOM count and PCB footprint by >40% vs dual-inductor solutions. |
Applications
| Smart Wearables | IoT Edge Sensors |
|---|---|
Use Scenario: Powering ultra-thin smart watches with variable battery voltage (2.8V–4.2V) while maintaining stable 3.3V MCU and display rails. IC Role / Device Role: Non-inverting buck-boost regulator with auto-bypass and I²C voltage scaling for dynamic power management. Use Value: Eliminates need for separate LDO or boost converter; extends battery life by 30% vs fixed-frequency alternatives at light loads. |
Use Scenario: Supplying 1.8V logic and 3.3V RF sections in battery-operated water/gas meter nodes with 10+ year deployment life. IC Role / Device Role: Ultra-low-IQ power manager enabling wake-on-event operation with sub-µA sleep current. Use Value: Achieves 84% efficiency at 10µA load, directly supporting 10-year coin-cell operation per ISO 4064 certification. |
| Hearing Aids | Wireless Earbuds |
Use Scenario: Regulating power for miniature Class-D amplifiers and DSPs in rechargeable hearing aids with tight thermal and size constraints. IC Role / Device Role: Compact 1.8mm×1.0mm WLCSP buck-boost IC with soft-start and hiccup-mode OCP. Use Value: Prevents audio pop during startup; thermal shutdown at 130°C avoids skin-contact overheating risks. |
Use Scenario: Delivering 500mA peak current to Bluetooth LE audio SoCs during streaming while minimizing heat in sealed earbud cavities. IC Role / Device Role: High-current-capable buck-boost with seamless buck/boost transition and 97% peak efficiency. Use Value: Sustains full audio performance across full battery discharge curve (4.2V→3.0V) without brownouts or mode-switching artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS63802DLAR | Higher IQ (2.5µA), fixed 3.3V/5V options only, no I²C interface, 2.5mm×2.5mm DFN package. | Lacks programmable output and forced bypass; suited for cost-sensitive, fixed-voltage designs with less stringent size constraints. | Select when I²C control and sub-2µA IQ are unnecessary and board space allows larger package. |
| Analog Devices ADP5070ACPZ-R7 | Requires external MOSFETs, higher minimum input (2.85V), no auto-bypass, 3mm×3mm LFCSP package. | Designed for precision analog rails; lacks integrated switches and ultra-low-IQ optimization for battery longevity. | Select only for high-accuracy, low-noise bias supplies where external component count is acceptable. |
Compared with TPS63802DLAR and ADP5070ACPZ-R7, the ISL9122AIRNZ-T uniquely combines 1300nA IQ, I²C-programmable output, auto/forced bypass, and 1.8mm×1.0mm WLCSP - making it the only option meeting simultaneous requirements for multi-year coin-cell life, dynamic voltage scaling, and sub-2mm² footprint in next-gen wearables.
Availability
ISL9122AIRNZ-T is available at Aetrix Electronics and suitable for smart watches, hearing aids, and IoT edge sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for ISL9122AIRNZ-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 management, and embedded solutions for automotive, industrial, and consumer markets.
The ISL9122A product line targets ultra-low-power portable electronics, delivering integrated buck-boost regulation with industry-leading quiescent current and minimal external component count for space- and energy-constrained applications.
FAQ
What is the minimum input voltage required for ISL9122AIRNZ-T to regulate a 3.3V output?
The ISL9122AIRNZ-T supports input voltages from 1.8V to 5.5V and can regulate 3.3V output across this entire range. At VIN = 1.8V, it operates in boost mode; at VIN = 3.6V, it transitions seamlessly between buck and boost; and at VIN = 4.2V, it operates in buck mode. The device's auto-bypass threshold activates when |VIN − VOUT| < ±1%×VOUT, ensuring stability without mode-switching artifacts. ISL9122AIRNZ-T maintains regulation down to 1.8V input without external circuitry.
How does the ISL9122AIRNZ-T achieve 1300nA quiescent current while maintaining regulation?
The ISL9122AIRNZ-T achieves 1300nA quiescent current through a combination of ultra-low-leakage internal circuitry, adaptive hysteretic control that disables switching during light loads, and optimized gate drive for its integrated MOSFETs. In regulation mode, only essential bias and reference circuits remain active; the controller enters burst-mode PFM operation below ~100µA load, minimizing switching losses. ISL9122AIRNZ-T's architecture eliminates the need for external compensation networks or high-current bias sources - directly enabling multi-year battery life in always-on devices.
Can the ISL9122AIRNZ-T be used without I²C communication?
Yes, the ISL9122AIRNZ-T operates as a stand-alone regulator with a factory-programmed default output voltage at power-on reset (POR). I²C is optional and used only for post-POR voltage adjustment, forced bypass activation, soft-discharge control, or fault flag reading. If I²C is unused, SDA and SCL pins must be pulled down to GND per datasheet guidance; leaving them floating is prohibited. ISL9122AIRNZ-T retains full buck-boost functionality, auto-bypass, and regulation without any I²C connection.
What is the maximum continuous output current for ISL9122AIRNZ-T at 2.5V input and 3.3V output?
At VIN = 2.5V and VOUT = 3.3V, the ISL9122AIRNZ-T operates in boost mode and delivers up to 300mA continuous output current, as specified in Figure 16 of the datasheet. This limitation arises from reduced duty cycle headroom and increased conduction losses at low input voltage. For 500mA output, VIN must exceed VOUT (i.e., buck operation) and remain above 2.5V - specifically, the condition "VIN > VOUT > 2.5V" must hold. ISL9122AIRNZ-T's peak current limit remains 2.5A regardless of operating mode.
Does the ISL9122AIRNZ-T require external compensation components?
No, the ISL9122AIRNZ-T uses a hysteretic PWM control architecture that requires no external compensation components. Its adaptive frequency control and internal error amplifier eliminate the need for external RC networks or type-II/III compensation. Only two ceramic capacitors (≥5µF CIN, ≥6µF COUT) and one 1µH 0603 inductor are required for full operation - reducing total solution size to under 4mm². This simplifies design validation and improves reliability versus voltage-mode controllers requiring precise loop compensation. ISL9122AIRNZ-T's architecture is inherently stable across all load and input conditions.
ISL9122AIRNZ-T 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-T FAQ
1.How can I place an order for ISL9122AIRNZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9122AIRNZ-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 ISL9122AIRNZ-T reliable?
The price and inventory of ISL9122AIRNZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9122AIRNZ-T is usually 5 days.
3.What payment methods are accepted for ISL9122AIRNZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9122AIRNZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9122AIRNZ-T?
ISL9122AIRNZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9122AIRNZ-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 ISL9122AIRNZ-T?
For technical support, including ISL9122AIRNZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9122AIRNZ-T requirements.
6.How does Aetrix verify that ISL9122AIRNZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9122AIRNZ-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 ISL9122AIRNZ-T meets industry standards.
7.What is the process for return or replacement of ISL9122AIRNZ-T?
All ISL9122AIRNZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9122AIRNZ-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 ISL9122AIRNZ-T part is unused and in its original packaging.
Return procedure for ISL9122AIRNZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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