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Renesas ISL9120IIAZ-T
- Part No.:
- ISL9120IIAZ-T
- Manufacturer:
- Renesas
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
ISL9120IIAZ-T.pdf
- Description:
- IC REG BUCK BST ADJ 800MA 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,149
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Product details
Overview
ISL9120IIAZ-T from Renesas Electronics is a compact, high-efficiency buck-boost switching regulator with adjustable output voltage (1.00–5.20 V), 1.8–5.5 V input range, and up to 800 mA output current at VIN = 2.5 V / VOUT = 3.3 V. It features automatic and forced bypass modes, adaptive PFM control, and operates in a 1.41 mm × 1.41 mm WLCSP package for space-constrained portable power rails.
For engineers reviewing the ISL9120IIAZ-T datasheet, ISL9120IIAZ-T pinout, ISL9120IIAZ-T application, or ISL9120IIAZ-T equivalent, this device serves as a low-quiescent-current (41 µA typ), thermally protected, single-inductor solution for dynamically varying input sources in battery-powered systems requiring stable regulated output across buck/boost transitions.
Technical Context
The ISL9120IIAZ-T implements a synchronous 4-switch buck-boost topology with integrated P-channel and N-channel MOSFETs (rDSON = 50 mΩ each), enabling seamless mode transitions without output disturbance. Its adaptive multilevel current limit scheme (32 levels, 350 mA–2 A) dynamically optimizes efficiency across load conditions.
It uses separate analog (GND) and power (PGND) ground pins to isolate sensitive reference circuitry from high di/dt switching currents, and supports both automatic bypass (VIN within 1–2% of VOUT) and logic-controlled forced bypass via the BYP pin - reducing quiescent current to ≤3.5 µA when regulation is unnecessary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion, Li-poly, or multi-cell alkaline/NiMH inputs without external pre-regulation. |
| Output Voltage Range | 1.00 V to 5.20 V - programmable via external resistor divider on FB pin for system-level voltage flexibility. |
| Max Output Current | 800 mA at VIN = 2.5 V / VOUT = 3.3 V - sufficient for powering PMIC rails, RF modules, or sensor subsystems. |
| Quiescent Current | 41 µA typical - enables >10-year battery life in always-on wearable or IoT standby modes. |
| Package | 1.41 mm × 1.41 mm, 9-bump WLCSP - ultra-small footprint compatible with high-density mobile PCB layouts. |
| Thermal Shutdown | 150 °C with 35 °C hysteresis - protects against sustained overload or poor thermal design without latch-up. |
| Bypass Mode IQ | ≤3.5 µA - reduces system idle power by >90% vs. active regulation, critical for LDO pre-regulator staging. |
Pinout & Package
ISL9120IIAZ-T is housed in a 9-bump Wafer-Level Chip-Scale Package (WLCSP), RoHS-compliant, with 0.4 mm pitch and bottom-side solder balls. The package outline is designated W3x3.9E per Renesas drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1 | Inductor input-side connection | Connects to one end of the single external inductor; carries full switching current during buck and boost phases. |
| LX2 | Inductor output-side connection | Connects to other end of inductor; forms part of 4-switch H-bridge topology enabling bidirectional energy transfer. |
| VOUT | Regulated output node | Delivers final output voltage; requires 22–47 µF ceramic capacitor to PGND for stability and ripple suppression. |
| FB | Feedback reference input | Accepts voltage divider from VOUT to set adjustable output; internal 0.80 V reference enables precise programming. |
| PGND | Power ground return | Low-impedance path for high-frequency inductor and switch currents; must be routed separately from analog GND. |
| EN | Enable control input | Logic-high active enable; drives device into shutdown (≤1 µA IQ) when pulled low; must not float. |
| GND | Analog ground reference | Reference for internal VREF, comparators, and bias circuits; isolated from PGND to prevent noise coupling. |
| VIN | Main power input | Supplies both converter power path and internal bias; requires 10 µF ceramic capacitor to PGND near pin. |
| BYP | Forced bypass mode control | Logic-high activates direct VIN-to-VOUT conduction path (no regulation); logic-low enables normal buck-boost operation. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive PFM control | Automatically adjusts switching frequency and peak current limit (32 levels) to maintain >90% efficiency from 10 µA to 800 mA loads. |
| Automatic bypass mode | Engages when |VIN − VOUT| ≤ 1–2%, eliminating switching losses and reducing output ripple to <10 mVPP. |
| Forced bypass functionality | Reduces total device IQ to ≤3.5 µA via BYP pin - ideal for powering downstream LDOs in deep-sleep states. |
| Integrated protection | Includes undervoltage lockout (1.725 V rising threshold), thermal shutdown (150 °C), and reverse-current blocking. |
| Single-inductor architecture | Eliminates need for separate buck and boost inductors - cuts BOM count, board area, and EMI sources in portable designs. |
Applications
| Smartphone Power Management | Wearable Sensor Hub |
|---|---|
Use Scenario: Regulating battery voltage (2.8–4.4 V) to supply 3.3 V or 1.8 V rails for baseband processors and memory during dynamic load transients. IC Role / Device Role / Timing Role: Primary buck-boost DC/DC converter providing stable, low-noise power independent of battery SOC. Use Value: Seamless buck/boost transition prevents brownouts during RF transmission bursts; 98% peak efficiency extends talk time. | Use Scenario: Powering an ultra-low-power MCU + environmental sensor cluster (accelerometer, temperature, humidity) from a coin-cell or thin-film battery. IC Role / Device Role / Timing Role: Adjustable-output regulator delivering 1.2 V or 2.8 V while supporting forced bypass during MCU sleep cycles. Use Value: ≤3.5 µA bypass IQ enables multi-year operation; small WLCSP footprint fits inside wristband form factor. |
| Portable Medical Monitor | Bluetooth LE Audio Earbud |
Use Scenario: Supplying regulated 3.0 V to analog front-end (AFE) and ADC in a handheld pulse oximeter with variable battery voltage. IC Role / Device Role / Timing Role: High-accuracy buck-boost regulator maintaining ±3% output tolerance over temperature and line/load variations. Use Value: 0.80 V internal reference and <±0.05 mV/mA load regulation ensure consistent AFE biasing for clinical-grade measurements. | Use Scenario: Delivering 1.2 V to Bluetooth SoC and 3.3 V to MEMS microphone in a dual-battery earbud with tight thermal constraints. IC Role / Device Role / Timing Role: Dual-rail capable regulator using FB divider to generate multiple outputs from single inductor. Use Value: 1.41 mm × 1.41 mm WLCSP allows placement under battery; soft-start prevents pop-noise during audio codec power-up. |
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 3.3 V output only; no adjustable version; higher 25 µA quiescent current in PFM mode. | Not suitable for systems requiring programmable output voltage or sub-10 µA standby IQ. | Select ISL9120IIAZ-T when adjustable VOUT, lower IQ, or forced bypass is required. |
| MAX77827BEWL+T | Supports I2C programmability and dynamic voltage scaling; larger 2.1 mm × 1.6 mm WLP package. | Preferred for systems needing runtime VOUT reconfiguration or tighter load transient response. | Choose ISL9120IIAZ-T for minimal footprint, lowest cost, and fixed-function simplicity. |
Compared with TPS63020DSJR and MAX77827BEWL+T, the ISL9120IIAZ-T delivers superior size efficiency (1.41 mm² vs ≥3.3 mm²), lowest forced-bypass IQ (≤3.5 µA), and seamless buck/boost handoff - making it optimal for space- and battery-limited consumer wearables.
Availability
ISL9120IIAZ-T is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, portable medical monitors, and Bluetooth LE audio earbuds requiring stable component supply with guaranteed long-term sourcing.
Supply support for ISL9120IIAZ-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 delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and consumer markets.
The ISL9120 product line was designed specifically for ultra-compact, high-efficiency power conversion in battery-powered portable electronics where input voltage varies widely and board space is severely constrained.
FAQ
What output voltage range does the ISL9120IIAZ-T support?
The ISL9120IIAZ-T supports an adjustable output voltage range of 1.00 V to 5.20 V, set via an external resistor divider on the FB pin. Its internal 0.80 V reference enables precise programming, and output accuracy is specified at ±3% to +4% over temperature and line/load conditions per the FN8659 datasheet.
How does the forced bypass mode function in the ISL9120IIAZ-T?
In forced bypass mode, the ISL9120IIAZ-T establishes a direct conduction path between VIN and VOUT using internal power switches, disabling regulation and reducing quiescent current to ≤3.5 µA. This mode is activated by driving the BYP pin logic-high and is intended for system sleep states where voltage regulation is unnecessary - such as when powering an LDO in standby.
What is the recommended inductor value for the ISL9120IIAZ-T?
The ISL9120IIAZ-T is optimized for use with a 1 µH shielded ferrite inductor rated for ≥2 A saturation current. Recommended parts include TDK TFM201610GHM-1R0MTAA (DCR = 50 mΩ, ISAT = 3.8 A) and Cyntec PIFE20161T-1R0MS (DCR = 65 mΩ, ISAT = 2.8 A), both in 2.0 mm × 1.6 mm × 1.0 mm packages.
Does the ISL9120IIAZ-T require separate input and output capacitors?
Yes - the ISL9120IIAZ-T requires a 10 µF X5R ceramic input capacitor (10 V rating, 0603 case) placed close to the VIN and PGND pins, and a 22–47 µF X5R ceramic output capacitor (6.3–10 V rating, 0603 case) connected between VOUT and PGND. These values are validated in the FN8659 datasheet for stability and ripple performance.
What protection features are integrated into the ISL9120IIAZ-T?
The ISL9120IIAZ-T integrates undervoltage lockout (UVLO, 1.725 V rising threshold), thermal shutdown (150 °C with 35 °C hysteresis), reverse-current blocking, and overtemperature detection. It also features soft-discharge (110 Ω internal pull-down on VOUT during shutdown) and robust ESD ratings (2.5 kV HBM).
ISL9120IIAZ-T 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-T FAQ
1.How can I place an order for ISL9120IIAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IIAZ-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 ISL9120IIAZ-T reliable?
The price and inventory of ISL9120IIAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IIAZ-T is usually 5 days.
3.What payment methods are accepted for ISL9120IIAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IIAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IIAZ-T?
ISL9120IIAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IIAZ-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 ISL9120IIAZ-T?
For technical support, including ISL9120IIAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IIAZ-T requirements.
6.How does Aetrix verify that ISL9120IIAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9120IIAZ-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 ISL9120IIAZ-T meets industry standards.
7.What is the process for return or replacement of ISL9120IIAZ-T?
All ISL9120IIAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IIAZ-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 ISL9120IIAZ-T part is unused and in its original packaging.
Return procedure for ISL9120IIAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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