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Renesas ISL9120IINZ-T7A
- Part No.:
- ISL9120IINZ-T7A
- Manufacturer:
- Renesas
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
ISL9120IINZ-T7A.pdf
- Description:
- IC REG BCK BST 3.3V 800MA 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
ISL9120IINZ-T7A from Renesas Electronics is a compact, high-efficiency buck-boost switching regulator with fixed 3.3V output, 1.8V–5.5V input range, up to 800mA output current (at VIN=2.5V), 98% peak efficiency, and automatic bypass mode for ultra-low quiescent current. It delivers regulated power in space-constrained portable devices where input voltage may dip below or rise above the output rail.
For engineers reviewing the ISL9120IINZ-T7A datasheet, ISL9120IINZ-T7A pinout, ISL9120IINZ-T7A application, or ISL9120IINZ-T7A equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world use cases, and two rigorously cross-checked alternative parts for design flexibility.
Technical Context
The ISL9120IINZ-T7A implements an adaptive PFM-controlled buck-boost topology that seamlessly transitions between buck, boost, and automatic bypass modes without output disturbance. Its dual internal MOSFETs (50mΩ P-channel and 50mΩ N-channel) enable bidirectional regulation while supporting forced bypass via the BYP pin.
It features a multilevel current limit scheme (32 levels, 350mA–2A), soft-start timing (1ms typical), thermal shutdown at +150°C with +35°C hysteresis, and undervoltage lockout (UVLO) with rising threshold of 1.725V–1.790V. The device uses separate GND and PGND pins to isolate analog and power return paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% to ±4% accuracy - eliminates external feedback resistors and simplifies layout. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-poly, and multi-cell alkaline/NiMH battery inputs. |
| Max Output Current | 800mA at VIN=2.5V, VOUT=3.3V - sufficient for core logic, RF transceivers, and sensor subsystems. |
| Quiescent Current | 41µA in PFM operation - maximizes light-load efficiency in always-on subsystems. |
| Bypass Mode IQ | ≤3.5µA (typical 0.8µA) - enables ultra-low-power standby when regulation is unnecessary. |
| Package | 1.41mm × 1.41mm, 9-bump WLCSP - smallest footprint among Renesas buck-boost regulators for wearables. |
| Protection Features | Thermal shutdown (+150°C), UVLO, reverse-current blocking, and overtemperature hysteresis (+35°C). |
Pinout & Package
ISL9120IINZ-T7A is housed in a RoHS-compliant 9-bump Wafer-Level Chip-Scale Package (WLCSP), outline W3x3.9E, with 0.4mm pitch and 1.41mm × 1.41mm body size. The package uses SnAgCu-e1 solder balls and is MSL3 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX2 (C1) | Inductor output-side connection | Switch node for boost-mode energy transfer; connects to output-side of 1µH inductor. |
| VOUT (C2) | Regulated output terminal | Delivers fixed 3.3V; requires 22µF–47µF ceramic capacitor to PGND for stability. |
| FB (C3) | Feedback reference point | Internally tied to VOUT in fixed-output version; no external divider needed. |
| PGND (B1) | Power ground | Low-impedance return path for high-switching-current loops; must be connected near LX1/LX2. |
| EN (B2) | Enable control input | Logic HIGH (>1.4V) enables regulation; logic LOW disables device and activates 110Ω soft-discharge resistor. |
| GND (B3) | Analog ground | Reference for internal comparators and references; isolated from PGND to prevent noise coupling. |
| LX1 (A1) | Inductor input-side connection | Switch node for buck-mode energy transfer; connects to input-side of 1µH inductor. |
| VIN (A2) | Main power input | Accepts 1.8V–5.5V; requires 10µF ceramic capacitor to PGND for input filtering. |
| BYP (A3) | Forced bypass mode control | Logic HIGH enables direct VIN-to-VOUT conduction (no regulation); logic LOW enables full buck-boost operation. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck/boost/bypass transition | Seamless mode switching within 1%–2% VIN–VOUT delta - eliminates output glitches during battery discharge. |
| Adaptive multilevel current limiting | 32 programmable peak current steps (350mA–2A) - optimizes efficiency across 0–800mA load range. |
| Forced bypass functionality | Reduces IQ to ≤3.5µA by shorting VIN to VOUT via internal FETs - ideal for LDO pre-regulator standby. |
| Integrated soft-start and soft-discharge | 1ms startup delay + controlled ramp; 110Ω internal discharge path on EN deassertion - prevents output hang-up. |
| Dual ground architecture | Separate GND (analog reference) and PGND (high-current return) - suppresses switching noise in sensitive analog circuits. |
Applications
| Smartphone Power Management | Wearable Health Sensor Hub |
|---|---|
|
Use Scenario: Powers baseband processor and PMIC rails from a single-cell Li-ion battery whose voltage sags from 4.2V to 2.8V during discharge. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 3.3V to I/O and memory interfaces. Use Value: Maintains regulation across full battery range without requiring multiple discrete converters or LDO post-regulation. |
Use Scenario: Supplies 3.3V to optical heart-rate sensor, accelerometer, and BLE radio in a wrist-worn fitness tracker. IC Role / Device Role / Timing Role: Compact, low-IQ power source enabling multi-day battery life in ultra-thin form factor. Use Value: 41µA quiescent current and forced bypass mode (<3.5µA) extend runtime during sleep cycles without sacrificing wake-up responsiveness. |
| Tablet Display Backlight Bias | Portable Medical Diagnostic Device |
|
Use Scenario: Provides bias voltage to white LED strings in a 7-inch tablet display, where input varies with USB or battery source. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter driving constant-current LED driver ICs. Use Value: 98% peak efficiency minimizes thermal dissipation in sealed enclosure; automatic bypass reduces ripple during steady-state operation. |
Use Scenario: Powers microcontroller, ADC, and wireless telemetry module in a handheld ECG monitor running on coin-cell or rechargeable battery. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck + boost + LDO chain in Class II medical electronics. Use Value: Small 1.41mm × 1.41mm WLCSP meets strict PCB area constraints; thermal shutdown ensures safe operation under fault conditions. |
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; 2A max output; 1.8V–5.5V input; 2.5mm × 2.5mm QFN-10 package; 22µA IQ. | Higher current capability and larger footprint; lacks forced bypass mode and automatic bypass window. | Choose when >800mA load or lower IQ is critical, and board space allows larger QFN. |
| MAX77827BEWL+T | Adjustable 2.5V–5.2V output; 1.8V–5.5V input; 1.2A max; 1.94mm × 1.44mm WLP-20; 25µA IQ. | Requires external feedback resistors; no forced bypass pin; includes I²C interface for dynamic voltage scaling. | Choose when programmable output or digital control is required, and fixed 3.3V is not mandatory. |
Compared with TPS63020DSJR and MAX77827BEWL+T, the ISL9120IINZ-T7A uniquely combines fixed 3.3V output, sub-4µA forced bypass IQ, automatic 1%–2% bypass window, and the industry's smallest 1.41mm × 1.41mm WLCSP - making it optimal for ultra-compact, battery-sensitive consumer wearables.
Availability
ISL9120IINZ-T7A is available at Aetrix Electronics and suitable for smartphone power management, wearable health sensor hubs, tablet display backlight bias, and portable medical diagnostic devices requiring stable component supply and long-term lifecycle support.
Supply support for ISL9120IINZ-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 mixed-signal solutions for automotive, industrial, and consumer markets.
The ISL9120 product line delivers highly integrated, ultra-compact buck-boost regulators targeting battery-powered portable electronics where input voltage fluctuates across the output rail and board space is severely constrained.
FAQ
What is the output voltage setting of the ISL9120IINZ-T7A?
The ISL9120IINZ-T7A is a fixed-output variant configured for 3.3V regulation. Unlike the adjustable ISL9120IIAZ, it internally connects the FB pin to VOUT, eliminating the need for external resistors. Output accuracy is specified as –3% to +4% over temperature and load, per the FN8659 Rev.3.00 datasheet.
Does the ISL9120IINZ-T7A support automatic bypass mode?
Yes, the ISL9120IINZ-T7A engages automatic bypass mode when VIN is within 1%–2% of VOUT (i.e., ~3.267V–3.366V), establishing a direct conduction path between VIN and VOUT to minimize losses and ripple. This behavior is inherent to the IC's control architecture and requires no external signal.
What is the minimum time required in forced bypass mode for the ISL9120IINZ-T7A?
The ISL9120IINZ-T7A requires a minimum of 800µs in forced bypass mode (BYP = HIGH) before transitioning back to buck-boost regulation. Additionally, after exiting forced bypass, a 1ms delay is required before re-entering forced bypass - both timing constraints are enforced by internal logic to ensure stability.
Can the ISL9120IINZ-T7A operate with a 1.8V input voltage?
Yes, the ISL9120IINZ-T7A supports input voltages as low as 1.8V, enabling operation down to the end-of-discharge voltage of single-cell Li-ion batteries. At VIN = 1.8V and VOUT = 3.3V, it operates exclusively in boost mode and delivers up to 800mA, subject to thermal limits and inductor saturation rating.
What package type and dimensions does the ISL9120IINZ-T7A use?
The ISL9120IINZ-T7A uses a 9-bump Wafer-Level Chip-Scale Package (WLCSP) with outline W3x3.9E, measuring 1.41mm × 1.41mm × 0.29mm (height). It features 0.4mm ball pitch, SnAgCu-e1 solder balls, and complies with RoHS and MSL3 reflow standards per Renesas documentation.
ISL9120IINZ-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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 800mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-WLCSP (1.41x1.41)
ISL9120IINZ-T7A FAQ
1.How can I place an order for ISL9120IINZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IINZ-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 ISL9120IINZ-T7A reliable?
The price and inventory of ISL9120IINZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IINZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9120IINZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IINZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IINZ-T7A?
ISL9120IINZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IINZ-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 ISL9120IINZ-T7A?
For technical support, including ISL9120IINZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IINZ-T7A requirements.
6.How does Aetrix verify that ISL9120IINZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9120IINZ-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 ISL9120IINZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9120IINZ-T7A?
All ISL9120IINZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IINZ-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 ISL9120IINZ-T7A part is unused and in its original packaging.
Return procedure for ISL9120IINZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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