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Renesas ISL9120IIAZ-T7A
- Part No.:
- ISL9120IIAZ-T7A
- Manufacturer:
- Renesas
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
ISL9120IIAZ-T7A.pdf
- Description:
- IC REG BUCK BST ADJ 800MA 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,340
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Product details
Overview
ISL9120IIAZ-T7A from Renesas Electronics is a compact, high-efficiency buck-boost switching regulator with adjustable output voltage (1.00V–5.20V), 1.8V–5.5V input range, and up to 800mA output current at VIN=2.5V/VOUT=3.3V. It features automatic buck/boost mode transition, forced bypass mode (≤3.5µA quiescent current), and operates in a 1.41mm×1.41mm WLCSP package for space-constrained portable power rails.
For engineers reviewing the ISL9120IIAZ-T7A datasheet, ISL9120IIAZ-T7A pinout, ISL9120IIAZ-T7A application, or ISL9120IIAZ-T7A equivalent, this device serves as a critical low-power, wide-input-range DC/DC solution for battery-powered wearables, smartphones, and always-on subsystems requiring seamless regulation across varying battery states.
Technical Context
The ISL9120IIAZ-T7A implements an adaptive PFM control architecture with a multilevel current limit scheme (32 levels, 350mA–2A) that dynamically adjusts peak inductor current to maximize efficiency across light and heavy loads. Its internal dual-MOSFET topology (50mΩ P-ch and 50mΩ N-ch) enables bidirectional energy transfer without external controllers.
It integrates separate analog (GND) and power (PGND) ground pins, a dedicated BYP pin for forced bypass activation, and soft-discharge (110Ω) on EN deassertion. Thermal shutdown triggers at +150°C with +35°C hysteresis, and UVLO activates at 1.725V (rising) to ensure stable startup under weak battery conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (2.7–4.2V), Li-poly, or 3x alkaline batteries without pre-regulation. |
| Output Voltage Range | 1.00V to 5.20V - programmable via external resistor divider (FB pin reference = 0.80V). |
| Max Output Current | 800mA at VIN=2.5V/VOUT=3.3V - sufficient for PMIC sub-rails, RF transceivers, or sensor hubs. |
| Quiescent Current | 41µA in PFM operation - enables >10-year battery life in ultra-low-power wake-up circuits. |
| Bypass Mode IQ | ≤3.5µA - reduces system standby power when downstream LDOs are inactive. |
| Package | 1.41mm × 1.41mm 9-bump WLCSP - minimizes PCB area and thermal resistance (θJA = 95°C/W). |
| Protection Features | UVLO, thermal shutdown (+150°C), reverse-current blocking, and overtemperature hysteresis (+35°C). |
Pinout & Package
ISL9120IIAZ-T7A uses a 9-bump Wafer-Level Chip-Scale Package (WLCSP), RoHS-compliant, with 0.4mm pitch and dimensions of 1.41mm × 1.41mm × 0.20mm (height). Land pattern follows NSMD pad design per TB451.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1 (LX2) | Inductor output-side switch node | Connects to output side of 1µH inductor; carries high-frequency AC current during boost/buck transitions. |
| C2 (VOUT) | Regulated output terminal | Delivers final buck-boost output; requires 22µF–47µF ceramic capacitor to PGND for stability and ripple suppression. |
| C3 (FB) | Voltage feedback input | Senses output via external resistor divider; internal 0.80V reference enables precise adjustable VOUT programming. |
| B1 (PGND) | Power ground return | Low-impedance path for high-switching-current return; must be isolated from analog GND to prevent noise coupling. |
| B2 (EN) | Enable logic input | Active-high control (VIH ≥1.4V); asserts soft-start sequence and disables internal regulators when pulled low. |
| B3 (GND) | Analog ground reference | Reference for FB, BYP, and internal references; must be connected to clean analog ground plane. |
| A1 (LX1) | Inductor input-side switch node | Connects to input side of 1µH inductor; switches between VIN and VOUT paths depending on operating mode. |
| A2 (VIN) | Main power input | Accepts 1.8V–5.5V supply; requires 10µF X5R ceramic capacitor to PGND near package for EMI filtering and decoupling. |
| A3 (BYP) | Forced bypass mode enable | Logic-high signal (≥1.4V) engages direct VIN-to-VOUT conduction path, disabling regulation and reducing IQ to ≤3.5µA. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive PFM control | Automatically selects optimal switching frequency and peak current limit (350mA–2A, 32 steps) to maintain >90% efficiency from 10µA to 800mA load. |
| Automatic bypass mode | Engages seamlessly when |VIN − VOUT| ≤1–2%, eliminating switching losses and reducing output ripple to <10mVpp without external intervention. |
| Forced bypass functionality | Reduces total device current draw to ≤3.5µA when regulation is unnecessary-ideal for powering idle LDOs or memory retention rails. |
| Integrated dual MOSFETs | 50mΩ P-channel and 50mΩ N-channel power switches eliminate need for external FETs, saving board space and BOM cost. |
| Soft-discharge circuit | 110Ω internal discharge path from VOUT to GND upon EN deassertion ensures safe, controlled output voltage decay (<10ms to 10% VOUT). |
Applications
| Smartphone Power Management | Wearable Sensor Hub |
|---|---|
|
Use Scenario: Supplying 1.8V rail to image signal processor (ISP) and camera module while battery voltage drops from 4.2V to 3.0V. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 1.8V output across full battery discharge curve without manual mode switching. Use Value: Eliminates need for discrete buck + boost combo; achieves >95% efficiency at 200mA load even at VIN=3.2V, extending usable battery capacity by ~12%. |
Use Scenario: Powering ultra-low-power motion sensor (accelerometer + gyroscope) and BLE radio in fitness tracker during active and sleep modes. IC Role / Device Role / Timing Role: Adjustable-output regulator delivering 2.8V to sensors and 3.3V to radio, with forced bypass during BLE sleep intervals. Use Value: Reduces system standby current from 41µA to ≤3.5µA during 90% of sleep time, enabling multi-week operation on 100mAh coin cell. |
| Tablet Display Bias Rail | Industrial IoT Edge Node |
|
Use Scenario: Generating 5.0V bias voltage for OLED display driver IC from shared 3.7V Li-ion battery rail. IC Role / Device Role / Timing Role: Boost-mode regulator when VIN < VOUT; transitions to buck mode if auxiliary 5V USB input is present. Use Value: Single-chip solution replaces discrete boost converter + OR-ing diode; maintains ±1.5% output accuracy across temperature (-40°C to +85°C). |
Use Scenario: Providing 3.3V main rail to microcontroller, LoRa transceiver, and environmental sensors in battery-operated remote monitoring node. IC Role / Device Role / Timing Role: Primary DC/DC regulator supporting intermittent 500mA transmit bursts and 10µA deep-sleep state. Use Value: Adaptive current limiting prevents output droop during 500mA pulses while sustaining >92% efficiency at 100µA, optimizing energy-per-transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Fixed 3.3V output only; no adjustable version; higher quiescent current (25µA vs 41µA in PFM, but no bypass mode). | Lacks forced bypass mode and adjustable VOUT - unsuitable for multi-rail or ultra-low-IQ standby scenarios. | Choose TPS63020DSJR only if fixed 3.3V output suffices and bypass functionality is unnecessary. |
| MAX77827AEWI+T | Higher max output current (1.2A); includes I²C interface for dynamic voltage scaling; larger 2.1mm×1.6mm WLP package. | Requires firmware control and additional PCB routing; over-spec'd for simple always-on rails where size and simplicity dominate. | Select MAX77827AEWI+T when programmable output voltage via I²C and >800mA capability are required. |
Compared with TPS63020DSJR and MAX77827AEWI+T, the ISL9120IIAZ-T7A uniquely balances ultra-small footprint (1.41mm²), true adjustability (1.0–5.2V), and sub-4µA forced bypass - making it optimal for miniaturized, multi-rail, battery-sensitive designs where integration and IQ are primary constraints.
Availability
ISL9120IIAZ-T7A is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, and industrial IoT edge nodes requiring stable component supply across long-lifecycle consumer and embedded programs.
Supply support for ISL9120IIAZ-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 timing solutions for automotive, industrial, and consumer markets.
The ISL9120 product line delivers highly integrated, ultra-compact buck-boost regulators targeting space- and power-constrained portable electronics, with emphasis on seamless mode transition and minimal external component count.
FAQ
What is the output voltage range supported by the ISL9120IIAZ-T7A?
The ISL9120IIAZ-T7A supports an adjustable output voltage range of 1.00V to 5.20V, set using an external resistor divider connected to the FB pin. Its internal feedback reference is precisely 0.80V, enabling accurate programming with standard 1% resistors. This range accommodates diverse subsystems including MCU cores, sensors, RF ICs, and display drivers without requiring multiple fixed-output variants. The ISL9120IIAZ-T7A does not support fixed-output configurations - those are implemented in the ISL9120IINZ series.
How does the forced bypass mode function in the ISL9120IIAZ-T7A?
In forced bypass mode, the ISL9120IIAZ-T7A establishes a low-resistance conduction path between VIN and VOUT by turning on both internal power MOSFETs, effectively disabling regulation and reducing quiescent current to ≤3.5µA. This mode is activated by driving the BYP pin logic-high (≥1.4V) and is intended for scenarios where voltage regulation is unnecessary - such as powering an idle LDO or memory retention rail. The ISL9120IIAZ-T7A provides no overcurrent protection in this mode, so external current limiting must be considered.
What package type and dimensions does the ISL9120IIAZ-T7A use?
The ISL9120IIAZ-T7A uses a 9-bump Wafer-Level Chip-Scale Package (WLCSP) with dimensions of 1.41mm × 1.41mm × 0.20mm and a 0.4mm ball pitch. Its package drawing is W3x3.9E, compliant with RoHS and MSL3 handling requirements. The small footprint minimizes PCB area and thermal resistance (θJA = 95°C/W), making it ideal for thin, space-constrained mobile and wearable devices. No leaded or QFN alternatives exist for this exact part number.
Can the ISL9120IIAZ-T7A operate with input voltages below 2.0V?
Yes, the ISL9120IIAZ-T7A supports an input voltage range of 1.8V to 5.5V, and its undervoltage lockout (UVLO) rising threshold is specified at 1.725V. It reliably starts and regulates down to 1.8V, making it suitable for deeply discharged single-cell Li-ion or Li-poly batteries. At VIN = 1.8V and VOUT = 2.8V, the device delivers up to 500mA while maintaining >85% efficiency - confirmed in Figure 4 of the FN8659 datasheet. Operation below 1.8V is outside specification and not guaranteed.
What external components are required for basic operation of the ISL9120IIAZ-T7A?
The ISL9120IIAZ-T7A requires only four essential external components for functional operation: a 1µH power inductor (with ≥2A saturation current), a 10µF X5R ceramic input capacitor (rated ≥10V), a 22µF–47µF X5R ceramic output capacitor (rated ≥6.3V), and two resistors (e.g., 187kΩ and 60.4kΩ) forming the FB voltage divider for output programming. A 22pF feed-forward capacitor across the upper FB resistor is recommended for optimal line/load regulation, per Figure 17 in the datasheet.
ISL9120IIAZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 9-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):
- 1V
- Voltage - Output (Max):
- 5.2V
- Current - Output:
- 800mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-WLCSP (1.41x1.41)
ISL9120IIAZ-T7A FAQ
1.How can I place an order for ISL9120IIAZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IIAZ-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 ISL9120IIAZ-T7A reliable?
The price and inventory of ISL9120IIAZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IIAZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9120IIAZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IIAZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IIAZ-T7A?
ISL9120IIAZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IIAZ-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 ISL9120IIAZ-T7A?
For technical support, including ISL9120IIAZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IIAZ-T7A requirements.
6.How does Aetrix verify that ISL9120IIAZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9120IIAZ-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 ISL9120IIAZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9120IIAZ-T7A?
All ISL9120IIAZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IIAZ-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 ISL9120IIAZ-T7A part is unused and in its original packaging.
Return procedure for ISL9120IIAZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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