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Renesas ISL9122AIINZ-T
- Part No.:
- ISL9122AIINZ-T
- Manufacturer:
- Renesas
- Package:
- 8-UFBGA, WLCSP
- Datasheet:
-
ISL9122AIINZ-T.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 8WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:10,125
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Product details
Overview
ISL9122AIINZ-T 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 when VIN > VOUT > 2.5V and features automatic buck/boost mode transition and forced bypass operation for ultra-low-power wearable power management.
For engineers reviewing the ISL9122AIINZ-T datasheet, ISL9122AIINZ-T pinout, ISL9122AIINZ-T application, or ISL9122AIINZ-T equivalent, key selection criteria include its hysteretic PWM/ PFM adaptive control, seamless mode transitions under line/load transients, 8-bump WLCSP package footprint, and I²C register-based voltage scaling and soft-discharge control.
Technical Context
The ISL9122AIINZ-T implements a dual-phase hysteretic controller architecture that dynamically selects buck, boost, or automatic bypass operation based on real-time VIN–VOUT differential. Its zero-crossing detection enables sub-µs mode transitions without output voltage disturbance.
Internal power MOSFETs (52mΩ P-ch / 50mΩ N-ch in buck; 55mΩ P-ch / 51mΩ N-ch in boost) are optimized for low RDS(on) across temperature, while the I²C interface (400kHz Fast Mode) supports full configuration of VSET, CONV_CFG, and INTFLG registers - including forced bypass enable, soft-discharge activation, and dynamic voltage scaling ramp rate (0.78–6.25 mV/µs).
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 - programmable in 12.5mV steps via I²C VSET register for precise rail matching. |
| Max Output Current | 500mA (VIN > VOUT > 2.5V) - sufficient for RF transceivers, sensors, and low-power MCUs in compact wearables. |
| Quiescent Current | 1300nA in regulation - enables multi-year battery life in always-on IoT endpoints like water/gas meters. |
| Efficiency | 97% peak (3.6V→3.3V, 50mA); 84% at 10µA load - maintains high efficiency across 7-decade load range. |
| Switching Control | Hysteretic PWM/PFM with adaptive frequency - eliminates external compensation, reduces BOM count to 1 inductor + 2 caps. |
| I²C Interface | Fast Mode (400kHz), 7-bit address 0x60 - enables runtime voltage scaling and fault flag polling without host CPU overhead. |
Pinout & Package
ISL9122AIINZ-T 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 1.8–5.5V; includes 1.79V UVLO with 40mV hysteresis for stable startup across battery discharge curves. |
| VOUT | Regulated output | Delivers configured output voltage; supports soft-start ramp (3.125 mV/µs default) and soft-discharge (160Ω internal resistor). |
| LX1 | Buck-phase switch node | Connects to inductor input side; drives internal P/N-channel buck FETs (52mΩ/50mΩ typical RDS(on)). |
| LX2 | Boost-phase switch node | Connects to inductor output side; drives internal P/N-channel boost FETs (55mΩ/51mΩ typical RDS(on)). |
| EN | Enable logic input | Active-high; requires ≥1.6V HIGH to enable; disables I²C interface and forces shutdown when pulled LOW. |
| SCL | I²C clock input | Fast Mode (400kHz); 0.36V–1.45V logic thresholds; 400pF max bus capacitance supported. |
| SDA | I²C data input/output | Open-drain; supports read/write of VSET, CONV_CFG, and INTFLG registers for full runtime control. |
| GND | Ground reference | Primary return path; EPAD must be soldered to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ regulation | 1300nA enables >10-year battery life in coin-cell-powered hearing aids and smart wristbands. |
| Auto buck/boost transition | Zero-crossing detection ensures <100ns mode switching with <±10mV output perturbation during VIN drift. |
| Forced bypass mode | 120nA IQ bypass (I²C-controlled) eliminates switching loss when VIN ≈ VOUT - critical for energy harvesting systems. |
| Dynamic voltage scaling | I²C-programmable ramp rate (0.78–6.25 mV/µs) allows safe MCU core voltage sequencing during sleep/wake transitions. |
| Integrated soft-discharge | 160Ω internal resistor discharges VOUT safely after I²C disable - prevents floating rails in multi-rail systems. |
Applications
| Smart Wearables | IoT Edge Sensors |
|---|---|
|
Use Scenario: Powering ultra-thin smart watches with variable battery voltage (2.8–4.2V) and multiple low-voltage subsystems (1.8V display, 3.3V BLE, 5.0V haptic). IC Role / Device Role / Timing Role: Single-chip buck-boost regulator providing stable, I²C-adjustable rails independent of battery state-of-charge. Use Value: Eliminates need for separate LDOs or discrete buck/boost stages, reducing solution size by >40% vs. legacy PMICs. |
Use Scenario: Supplying wireless sensor nodes in utility metering (water/gas/oil) operating from primary lithium batteries for 10+ years. IC Role / Device Role / Timing Role: Primary power converter delivering regulated 3.3V to MCU and RF transceiver with nanoamp-level standby IQ. Use Value: 1300nA regulation IQ extends battery lifetime beyond 12 years at 10µA average system load. |
| Hearing Aids | Wireless Earbuds |
|
Use Scenario: Powering Class-H audio amplifiers and low-power DSP in rechargeable hearing aids with tight space constraints. IC Role / Device Role / Timing Role: High-efficiency buck-boost supplying 1.8V digital core and 3.3V analog front-end from 3.6V Li-ion cell. Use Value: 97% peak efficiency minimizes heat generation in sealed ear canal enclosures; 1.8×1.0mm WLCSP fits behind-the-ear form factors. |
Use Scenario: Managing dual-rail power (1.2V SoC, 3.3V Bluetooth radio) in true wireless stereo (TWS) earbuds with rapid charge/discharge cycles. IC Role / Device Role / Timing Role: I²C-configurable regulator enabling dynamic voltage scaling during codec processing and RF transmission bursts. Use Value: Programmable soft-start and soft-discharge prevent pop/click artifacts during power-up/down; 8nA shutdown IQ preserves charge between use sessions. |
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), fixed 3.3V/5.0V options only; no I²C interface; 2.5V–5.5V input. | Lacks dynamic voltage scaling and soft-discharge; suited for cost-sensitive, fixed-rail designs without runtime reconfiguration. | Select TPS63802DLAR only if I²C control and sub-µA IQ are not required and fixed output simplifies firmware. |
| MAX77654EWL+ | Multi-rail PMIC (3 buck + 1 LDO); 1.2µA IQ; I²C interface; 2.5V–5.5V input; larger 2.1mm×1.6mm WLP. | Provides integrated power sequencing and battery charging - over-specified if only single-buck-boost rail is needed. | Choose MAX77654EWL+ only when additional rails, charger, or system-level power management justify added complexity and footprint. |
Compared with TPS63802DLAR and MAX77654EWL+, the ISL9122AIINZ-T uniquely balances ultra-low IQ (1300nA), full I²C configurability, and minimal 1.8mm×1.0mm footprint - making it optimal for space-constrained, long-life, single-rail wearable and sensor applications where runtime reconfiguration matters.
Availability
ISL9122AIINZ-T is available at Aetrix Electronics and suitable for smart wearables, IoT edge sensors, and portable medical devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for ISL9122AIINZ-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 connectivity solutions for automotive, industrial, and IoT markets.
The ISL9122A product line targets ultra-low-power, space-constrained battery-operated devices - designed specifically for wearables, hearing aids, and remote sensors demanding nanoscale IQ and I²C-based power rail agility.
FAQ
What is the minimum input voltage required for ISL9122AIINZ-T to start regulation?
The ISL9122AIINZ-T has a 1.79V undervoltage lockout (UVLO) threshold with 40mV hysteresis. Regulation begins when VIN rises above 1.79V and EN is asserted high. This allows reliable startup from partially discharged single-cell Li-ion (≥2.8V) or alkaline (≥1.8V) sources. The device remains operational down to 1.8V input, supporting deep battery discharge profiles common in wearables.
Does ISL9122AIINZ-T support true I²C-controlled shutdown with soft-discharge?
Yes. The ISL9122AIINZ-T supports I²C-controlled shutdown via the CONV_CFG register: setting DISCH = 1 and EN_AND = 0 activates the internal 160Ω soft-discharge path between VOUT and GND while keeping EN high. This safely drains output capacitance without requiring external circuitry - essential for preventing latch-up in multi-rail systems powered by ISL9122AIINZ-T.
What is the maximum output current capability of ISL9122AIINZ-T at 1.8V input?
At VIN = 1.8V, the ISL9122AIINZ-T delivers up to 250mA output current when VOUT = 1.8V (buck-only operation), per Figure 16 in the datasheet. Current capability scales with input voltage: 500mA is achievable only when VIN > VOUT > 2.5V (e.g., 3.6V → 3.3V). Below 2.5V input, peak current is derated to maintain stability and thermal safety.
Can ISL9122AIINZ-T operate in forced PWM mode across all load conditions?
Yes. The ISL9122AIINZ-T supports forced PWM mode via the CONV_CFG register (FMODE bits), disabling PFM and maintaining constant switching frequency (up to 2.5MHz at VOUT = 1.8V). This ensures predictable EMI behavior and eliminates low-frequency ripple in noise-sensitive analog circuits - critical for audio amplifiers and precision ADCs powered by ISL9122AIINZ-T.
Is the 8-bump WLCSP package of ISL9122AIINZ-T compatible with standard reflow profiles?
Yes. The ISL9122AIINZ-T's 8-bump WLCSP (1.8mm × 1.0mm) is qualified for JEDEC J-STD-020D moisture sensitivity level 1 and supports standard Pb-free reflow profiles (peak 260°C). The exposed pad must be fully soldered to a thermally robust PCB ground plane to achieve θJA = 110°C/W and ensure reliable operation at 500mA loads.
ISL9122AIINZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UFBGA, WLCSP
- 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-WLCSP (1.8x1)
ISL9122AIINZ-T FAQ
1.How can I place an order for ISL9122AIINZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9122AIINZ-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 ISL9122AIINZ-T reliable?
The price and inventory of ISL9122AIINZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9122AIINZ-T is usually 5 days.
3.What payment methods are accepted for ISL9122AIINZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9122AIINZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9122AIINZ-T?
ISL9122AIINZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9122AIINZ-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 ISL9122AIINZ-T?
For technical support, including ISL9122AIINZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9122AIINZ-T requirements.
6.How does Aetrix verify that ISL9122AIINZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9122AIINZ-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 ISL9122AIINZ-T meets industry standards.
7.What is the process for return or replacement of ISL9122AIINZ-T?
All ISL9122AIINZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9122AIINZ-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 ISL9122AIINZ-T part is unused and in its original packaging.
Return procedure for ISL9122AIINZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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