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Renesas ISL9122AIIN-EVZ
- Part No.:
- ISL9122AIIN-EVZ
- Manufacturer:
- Renesas
- Package:
- Datasheet:
-
ISL9122AIIN-EVZ.pdf
- Description:
- EVAL BOARD FOR ISL9122A
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Product details
Overview
ISL9122AIIN-EVZ from Renesas Electronics is a non-inverting buck-boost switching regulator with 1300nA quiescent current in regulation mode, 1.8V–5.5V input range, and I²C-adjustable output (1.8V–5.375V). It delivers up to 500mA output current and supports seamless buck/boost transitions for battery-powered wearables and IoT edge nodes.
For engineers reviewing the ISL9122AIIN-EVZ datasheet, ISL9122AIIN-EVZ pinout, ISL9122AIIN-EVZ application, or ISL9122AIIN-EVZ equivalent, key selection criteria include ultra-low IQ operation, automatic bypass functionality near VIN ≈ VOUT, hysteretic PWM/PFM control architecture, and compatibility with 0603-size inductors and minimal external components.
Technical Context
The ISL9122AIIN-EVZ implements an adaptive-frequency hysteretic controller that dynamically selects buck, boost, or bypass modes based on real-time VIN–VOUT differential. Its digital core manages I²C register access for voltage scaling, forced mode selection, and soft-discharge activation without requiring external microcontroller intervention.
It integrates dual P/N-channel MOSFETs per phase (rDSON_A ≤ 52mΩ, rDSON_C ≤ 51mΩ), supports hiccup-mode overcurrent protection with 100ms fault wait time, and features thermal shutdown at 130°C with 25°C hysteresis - all within a single-chip solution requiring only one inductor and two capacitors.
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 stacks without pre-regulation. |
| Output Voltage Range | 1.8V to 5.375V - digitally adjustable via I²C; default set at POR for stand-alone use. |
| Max Output Current | 500mA (VIN > VOUT > 2.5V) - sufficient for RF transceivers, sensors, and low-power MCUs in compact devices. |
| Quiescent Current | 1300nA in regulation, 120nA in forced bypass, 8nA in shutdown - enables multi-year battery life in always-on IoT endpoints. |
| Efficiency | 97% peak (3.6V→3.3V @ 50mA), 84% at 10µA load - maintains high conversion efficiency across ultra-light to medium loads. |
| Switching Control | Hysteretic PWM/PFM - eliminates external compensation, reduces component count, and ensures fast transient response. |
| I²C Interface | Fast-mode (up to 400kHz) - enables dynamic voltage scaling and power-state coordination in system-level firmware. |
Pinout & Package
ISL9122AIIN-EVZ uses an 8-pin WLCSP package (1.8mm × 1.0mm) with exposed pad for thermal management. Pin assignments are validated per Renesas FN8947 Rev.1.03 datasheet Page 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 1.8V–5.5V; includes undervoltage lockout (1.79V threshold, 40mV hysteresis). |
| VOUT | Buck-boost regulated output | Delivers programmable 1.8V–5.375V; connects to load and output capacitor (min 6µF). |
| EN | Enable logic input | Active-high; must be driven ≥1.6V to enable; disables I²C when LOW. |
| SCL | I²C clock input | Fast-mode compatible (≤400kHz); requires pull-down if unused. |
| SDA | I²C data input/output | Open-drain; requires pull-down if unused; supports read/write of VSET and CONV_CFG registers. |
| LX1 | Inductor connection (input side) | Swings between VIN and GND during buck operation; connects to 1µH 0603 inductor. |
| LX2 | Inductor connection (output side) | Swings between VOUT and GND during boost operation; shares same inductor as LX1. |
| GND | Ground reference | Common return path for power and logic; EPAD must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ regulation | 1300nA enables >10-year battery life in coin-cell-powered meters and wearables. |
| Auto & forced bypass modes | Eliminates switching losses when |VIN − VOUT| < ±1%×VOUT, improving light-load efficiency. |
| Seamless buck/boost transition | No output disturbance during mode switching - critical for stable MCU/Sensor rail in varying battery states. |
| I²C programmability | Adjusts VOUT, selects operating mode (PWM/PFM/bypass), and activates soft-discharge without hardware changes. |
| Minimal BOM footprint | Requires only one 0603 inductor and two MLCCs - reduces PCB area and bill-of-materials cost. |
Applications
| Smart Wearables | IoT Edge Sensors |
|---|---|
Use Scenario: Powering display, BLE radio, and motion sensor in wrist-worn health monitors with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary system regulator maintaining stable 3.3V rail while battery discharges from 4.2V to 2.8V. Use Value: Auto-bypass extends usable battery range by 18% compared to fixed-mode regulators at light loads. | Use Scenario: Supplying ultra-low-power environmental sensor node with intermittent wake-up and wireless transmission. IC Role / Device Role / Timing Role: System power manager enabling dynamic voltage scaling to match processing load and radio transmit power. Use Value: 120nA forced bypass mode cuts standby current by 91% versus regulation mode, extending field deployment life. |
| Portable Medical Devices | Utility Meters |
Use Scenario: Regulating power for hearing aid DSP and audio amplifier with tight noise and ripple requirements. IC Role / Device Role / Timing Role: Low-noise buck-boost converter delivering clean 1.8V core voltage with <20mVpp ripple under dynamic load. Use Value: Hysteretic control provides sub-10µs transient response to audio burst loads, preventing audible artifacts. | Use Scenario: Long-life water/gas meter powered by primary lithium battery with 15+ year service life target. IC Role / Device Role / Timing Role: Primary energy-harvesting interface and battery regulator supporting pulse-mode ultrasonic flow sensing. Use Value: 8nA shutdown current minimizes annual self-discharge, preserving >95% battery capacity after 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLAR | Higher IQ (2.5µA), no I²C interface, fixed or resistor-programmed VOUT only. | Lacks dynamic voltage scaling; suitable for static-rail designs where firmware control is unnecessary. | Select when lowest possible BOM count and absence of digital control simplify certification. |
| MAX77654EWJ+T | Integrated charger + fuel gauge; IQ = 4µA; supports USB input but larger 20-pin WLP package. | Targets rechargeable systems with battery management; adds complexity for primary-cell-only use cases. | Choose only if simultaneous charging, telemetry, and buck-boost regulation are required in same footprint. |
Compared with TPS63802DLAR and MAX77654EWJ+T, the ISL9122AIIN-EVZ uniquely combines sub-µA quiescent current, I²C programmability, and minimal 1.8mm×1.0mm WLCSP packaging - making it optimal for space-constrained, long-life, firmware-controlled battery systems.
Availability
ISL9122AIIN-EVZ is available at Aetrix Electronics and suitable for smart wearables, IoT edge sensors, and portable medical devices requiring stable component supply, long-lifecycle support, and verified performance across -40°C to +85°C ambient conditions.
Supply support for ISL9122AIIN-EVZ 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 delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets, with deep expertise in power management ICs.
The ISL9122A product line targets ultra-low-power, size-constrained battery-operated devices - designed specifically to extend operational lifetime while enabling intelligent power-state control via standard digital interfaces.
FAQ
What is the minimum input voltage required for ISL9122AIIN-EVZ to start regulation?
The ISL9122AIIN-EVZ 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 weak or aging batteries commonly used in IoT and wearable applications.
How does ISL9122AIIN-EVZ handle transitions between buck and boost modes?
The ISL9122AIIN-EVZ uses a hysteretic control architecture that automatically and seamlessly transitions between buck and boost modes without output disturbance. When VIN crosses VOUT ±1%×VOUT, the controller reconfigures internal switch states in real time - confirmed by transient waveforms in Figures 35–44 of the FN8947 datasheet - ensuring stable rail delivery during battery discharge cycles.
Can ISL9122AIIN-EVZ operate without an I²C host controller?
Yes. The ISL9122AIIN-EVZ supports stand-alone operation with a factory-programmed default output voltage at power-on reset (POR). I²C is optional for post-POR voltage adjustment, mode selection, or soft-discharge activation - making it viable for simple systems lacking firmware control.
What is the maximum output current capability of ISL9122AIIN-EVZ across its input voltage range?
The ISL9122AIIN-EVZ delivers up to 500mA when VIN > VOUT > 2.5V. At lower VIN (1.8V–2.5V), max current scales linearly down to 2.5×(VIN/2.5) A per Figure 16. For example, at VIN = 2.0V and VOUT = 1.8V, maximum continuous output is ~400mA - verified across temperature and load conditions in the datasheet's recommended operating range.
Does ISL9122AIIN-EVZ include overtemperature protection?
Yes. The ISL9122AIIN-EVZ incorporates thermal shutdown at 130°C with 25°C hysteresis. When junction temperature exceeds 130°C, the device halts switching and enters thermal shutdown until temperature falls below 105°C. This protection is independent of EN or I²C state and is implemented in analog circuitry for fail-safe reliability.
ISL9122AIIN-EVZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Up or Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 3.3V
- Voltage - Input:
- 500mA
- Regulator Topology:
- 1.8V ~ 5.5V
- Frequency - Switching:
- Buck-Boost
- Contents:
- 2.5MHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- ISL9122A
ISL9122AIIN-EVZ FAQ
1.How can I place an order for ISL9122AIIN-EVZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9122AIIN-EVZ 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 ISL9122AIIN-EVZ reliable?
The price and inventory of ISL9122AIIN-EVZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9122AIIN-EVZ is usually 5 days.
3.What payment methods are accepted for ISL9122AIIN-EVZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9122AIIN-EVZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9122AIIN-EVZ?
ISL9122AIIN-EVZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9122AIIN-EVZ 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 ISL9122AIIN-EVZ?
For technical support, including ISL9122AIIN-EVZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9122AIIN-EVZ requirements.
6.How does Aetrix verify that ISL9122AIIN-EVZ is sourced from the original manufacturer or authorized distributors?
All ISL9122AIIN-EVZ 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 ISL9122AIIN-EVZ meets industry standards.
7.What is the process for return or replacement of ISL9122AIIN-EVZ?
All ISL9122AIIN-EVZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL9122AIIN-EVZ, 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 ISL9122AIIN-EVZ part is unused and in its original packaging.
Return procedure for ISL9122AIIN-EVZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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