My Inquiry
My Account
Renesas ISL9122AIINZ-T7A
- Part No.:
- ISL9122AIINZ-T7A
- Manufacturer:
- Renesas
- Package:
- 8-UFBGA, WLCSP
- Datasheet:
-
ISL9122AIINZ-T7A.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 8WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,107
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL9122AIINZ-T7A 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 supports seamless buck/boost transitions and automatic bypass for ultra-low-power wearable power rails.
For engineers reviewing the ISL9122AIINZ-T7A datasheet, ISL9122AIINZ-T7A pinout, ISL9122AIINZ-T7A application, or ISL9122AIINZ-T7A equivalent, key selection criteria include ultra-low IQ operation, hysteretic adaptive-frequency control, forced bypass mode accessibility via I²C, and compatibility with single 0603 inductor + two external capacitors in space-constrained IoT and medical devices.
Technical Context
The ISL9122AIINZ-T7A implements a hysteretic PWM controller with integrated P/N-channel MOSFETs for buck and boost phases, enabling automatic topology switching without output disturbance. Its digital core manages I²C register access (VSET, CONV_CFG), soft-start ramp rate (0.78–6.25 mV/µs), and soft-discharge activation (160Ω internal resistor).
It operates across –40°C to +85°C ambient, supports Fast-mode I²C (up to 400kHz), and features undervoltage lockout (1.79V, 40mV hysteresis), thermal shutdown (130°C), and hiccup-mode overcurrent protection (2.5A peak limit). The device enters Forced Bypass mode via I²C register write (FMODE = 0x3), reducing supply current to 120nA.
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, enabling precise rail matching for mixed-voltage SoCs. |
| Quiescent Current | 1300nA in regulation - enables >1-year battery life in always-on sensor nodes drawing <10µA average load. |
| Peak Efficiency | 97% at 50mA (VIN=3.7V, VOUT=3.3V) - minimizes thermal rise in sealed enclosures like hearing aids. |
| Output Current | 500mA max (VIN > VOUT > 2.5V) - sufficient for RF transceivers, BLE SoCs, and low-power microcontrollers. |
| Switching Architecture | Hysteretic adaptive-frequency control - eliminates external compensation, reduces component count, and ensures stable light-load PFM operation. |
| I²C Interface | Fast-mode (400kHz), 7-bit address - enables dynamic voltage scaling and real-time fault flag monitoring (INTFLG_REG). |
Pinout & Package
ISL9122AIINZ-T7A uses an 8-bump WLCSP package (1.8mm × 1.0mm, 0.4mm pitch) with exposed pad (EPAD) soldered to PCB ground for thermal performance. 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; connects to input capacitor (min. 5µF) and battery or source rail. |
| VOUT | Buck-boost regulated output | Delivers programmable 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 other end of same inductor. |
| GND | Ground reference | Primary return path; must be tied to EPAD and system ground plane for EMI and thermal integrity. |
| EN | Enable logic input | Active-high enable; must be pulled high (>1.6V) to operate; floating prohibited. |
| SDA | I²C data line | Open-drain bidirectional interface; requires external pull-up (3.6V typical); disabled when EN = LOW. |
| SCL | I²C clock line | Input-only clock; requires external pull-up; synchronizes register reads/writes per Fast-mode timing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ regulation | 1300nA enables multi-year battery life in maintenance-free IoT endpoints and wearables. |
| Auto & forced bypass modes | Eliminates switching loss when VIN ≈ VOUT; forced bypass (120nA) extends runtime during standby. |
| Single-inductor buck-boost topology | Reduces solution size by 30% vs dual-inductor alternatives; compatible with 0603 footprint inductors. |
| I²C-programmable VOUT | Adjusts output in 12.5mV increments post-POR, supporting dynamic DVFS in resource-constrained MCUs. |
| Hiccup-mode OCP | 2.5A peak current limit with 100ms restart delay prevents thermal runaway during sustained short-circuit events. |
| Soft discharge on I²C disable | 160Ω internal resistor safely discharges VOUT without external circuitry when disabling via register. |
Applications
| Smart Wearables | Wireless Audio |
|---|---|
|
Use Scenario: Power management in compact smartwatches with variable battery voltage (3.0–4.2V) and fixed 3.3V MCU/radio rails. IC Role / Device Role / Timing Role: Non-inverting buck-boost regulator maintaining stable 3.3V output as battery discharges below nominal voltage. Use Value: Eliminates need for separate LDO or boost converter; 1300nA IQ extends battery life beyond 7 days in always-on display mode. |
Use Scenario: Supplying 1.8V DSP core and 3.3V Bluetooth radio in true wireless stereo earbuds. IC Role / Device Role / Timing Role: Single-chip power solution delivering dual regulated rails via I²C sequencing and dynamic voltage scaling. Use Value: Reduces BOM count by replacing discrete regulators; 97% peak efficiency minimizes heat in sealed earbud housing. |
| IoT Sensor Nodes | Portable Medical Devices |
|
Use Scenario: Long-life water/gas meter with coin-cell battery and sub-10µA sleep current requirement. IC Role / Device Role / Timing Role: Primary DC-DC converter enabling ultra-low-power wake-up cycles and sensor measurement bursts. Use Value: 8nA shutdown current and 120nA forced bypass mode allow >10-year battery lifetime under typical usage profiles. |
Use Scenario: Powering glucose monitor or pulse oximeter with single AAA battery and strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, high-efficiency regulator meeting Class B EMC requirements without added filtering. Use Value: Hysteretic control avoids audible switching noise; 1.8mm×1.0mm WLCSP fits within tight mechanical envelopes. |
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 (1.5µA), fixed 3.3V/5V options only, no I²C interface, 2.5V–5.5V input. | Best for cost-sensitive, static-rail designs where dynamic adjustment is unnecessary. | Select when I²C control is not required and board space allows larger 2.0mm×2.0mm DFN package. |
| MAX77654AEWJ+T | Integrated fuel gauge and charger; 2.5µA IQ; I²C but limited VOUT range (0.6V–3.775V); 2.5V–5.5V input. | Suitable for battery-powered systems needing charge management alongside regulation. | Choose only if fuel gauging and charging functionality are required; not drop-in for pure regulation use cases. |
Compared with TPS63802DLAR and MAX77654AEWJ+T, the ISL9122AIINZ-T7A uniquely combines sub-µA quiescent current, full I²C programmability across 1.8V–5.375V, and single-inductor buck-boost operation in a 1.8mm×1.0mm WLCSP-making it optimal for ultra-miniaturized, dynamically managed power rails.
Availability
ISL9122AIINZ-T7A is available at Aetrix Electronics and suitable for smart wearables, wireless audio devices, and portable medical equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9122AIINZ-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 management, and embedded solutions for automotive, industrial, and IoT markets.
The ISL9122A product line targets ultra-low-power, space-constrained battery-operated devices-designed to replace multiple discrete regulators with a single highly integrated buck-boost IC featuring intelligent power-saving modes.
FAQ
What is the minimum input voltage required for ISL9122AIINZ-T7A to regulate a 3.3V output?
The ISL9122AIINZ-T7A regulates down to 1.8V input, so it can maintain 3.3V output even when VIN drops to 1.8V using boost mode. However, maximum output current is reduced below 2.5V input; at VIN = 1.8V, the device delivers ~100mA into 3.3V (per Figure 16). For full 500mA capability, VIN must exceed VOUT (3.3V) and remain above 2.5V.
Does ISL9122AIINZ-T7A support dynamic voltage scaling (DVS) during operation?
Yes, ISL9122AIINZ-T7A supports real-time DVS via its I²C interface. The VSET register allows output voltage adjustment in 12.5mV steps while operating, and the DVSRATE field in CONV_CFG controls ramp rate (0.78–6.25 mV/µs). This enables adaptive power management for processors or radios that change voltage requirements mid-operation.
Can ISL9122AIINZ-T7A be used without I²C communication?
Yes. ISL9122AIINZ-T7A powers up with a factory-default output voltage (configurable at order time) and operates autonomously. SDA and SCL pins must be pulled down to GND if unused. All regulation, bypass, and protection functions remain fully active without I²C-only programmability and status monitoring require the bus.
What is the thermal performance difference between the WLCSP and DFN packages of ISL9122A?
The ISL9122AIINZ-T7A uses the 8-bump WLCSP package (θJA = 110°C/W). In contrast, the 8-lead DFN variant has θJA = 72°C/W due to larger copper area and exposed pad thermal path. For high-current or high-ambient applications (>60°C), the DFN offers better thermal margin-but the WLCSP's 1.8mm×1.0mm footprint remains optimal for ultra-dense layouts where thermal mass is managed via PCB copper.
How does ISL9122AIINZ-T7A handle input voltage transitions near the output voltage?
ISL9122AIINZ-T7A uses zero-crossing detection and seamless PWM/PFM modulation to transition between buck, boost, and auto-bypass modes without output glitch. When |VIN − VOUT| falls within ±1% of VOUT, it enters auto-bypass-connecting VIN directly to VOUT through internal MOSFETs-reducing quiescent current to 120nA and eliminating switching noise.
ISL9122AIINZ-T7A 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-T7A FAQ
1.How can I place an order for ISL9122AIINZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9122AIINZ-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 ISL9122AIINZ-T7A reliable?
The price and inventory of ISL9122AIINZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9122AIINZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9122AIINZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9122AIINZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9122AIINZ-T7A?
ISL9122AIINZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9122AIINZ-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 ISL9122AIINZ-T7A?
For technical support, including ISL9122AIINZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9122AIINZ-T7A requirements.
6.How does Aetrix verify that ISL9122AIINZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9122AIINZ-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 ISL9122AIINZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9122AIINZ-T7A?
All ISL9122AIINZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9122AIINZ-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 ISL9122AIINZ-T7A part is unused and in its original packaging.
Return procedure for ISL9122AIINZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL9122AIINZ-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…
