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Renesas ISL9120IRTAZ-T7A
- Part No.:
- ISL9120IRTAZ-T7A
- Manufacturer:
- Renesas
- Package:
- 12-WFQFN Exposed Pad
- Datasheet:
-
ISL9120IRTAZ-T7A.pdf
- Description:
- IC REG BUCK BST ADJ 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,049
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Product details
Overview
ISL9120IRTAZ-T7A from Intersil is a compact, high-efficiency buck-boost switching regulator that delivers up to 800mA output current with input voltage range of 1.8V–5.5V and fixed 3.3V output. It automatically transitions between buck and boost modes and supports forced bypass mode via BYPS pin for ultra-low 3.5µA quiescent current. This device is used in portable power rails for smartphones and wearables where input voltage may dip below or rise above the regulated output.
For engineers reviewing the ISL9120IRTAZ-T7A datasheet, ISL9120IRTAZ-T7A pinout, ISL9120IRTAZ-T7A application, or ISL9120IRTAZ-T7A equivalent, key selection criteria include its adaptive PFM control architecture, 12-pin 3×3mm TQFN package, automatic bypass functionality within ±1–2% VIN–VOUT tolerance, and integrated thermal/UVLO protection for robust battery-powered operation.
Technical Context
The ISL9120IRTAZ-T7A implements a four-switch buck-boost topology with internal P-channel and N-channel MOSFETs (rDSON = 63mΩ each), enabling seamless mode transitions without output disturbance. Its adaptive multilevel current limit scheme dynamically adjusts peak inductor current from 350mA to 2A across 32 levels based on pulse count in PFM bursts.
It features dual ground pins (GND and PGND) to isolate analog reference paths from high-switching-current return paths, and includes soft-start (1ms delay + ramp), soft-discharge (110Ω internal VOUT-to-GND resistor), and precise undervoltage lockout (1.725V–1.790V rising threshold) for reliable startup under varying battery conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH battery inputs without external pre-regulation. |
| Output Voltage | Fixed 3.3V - eliminates need for external feedback resistors; FB pin internally tied to VOUT in this variant. |
| Max Output Current | 800mA at VIN=2.5V, VOUT=3.3V - sufficient for powering PMICs, RF modules, or sensor subsystems in portable devices. |
| Quiescent Current | 41µA in regulation mode; ≤3.5µA in forced bypass - extends battery life during low-power or standby states. |
| Efficiency | Up to 98% - achieved via adaptive PFM control and low rDSON MOSFETs, minimizing thermal load in space-constrained layouts. |
| Protection Features | Thermal shutdown (150°C), UVLO (1.725V rising), overtemperature hysteresis (35°C), reverse-current blocking - ensures safe operation under fault or brownout conditions. |
| Package | 12-lead 3mm × 3mm TQFN (RoHS-compliant, L12.3x3A) - enables ultra-compact DC/DC solution with minimal PCB footprint and thermal resistance (θJC = 5°C/W). |
Pinout & Package
ISL9120IRTAZ-T7A is housed in a 3mm × 3mm, 12-lead thin quad flat no-lead (TQFN) package with exposed thermal pad (EPAD). The package supports reflow soldering per Pb-free profile (TB493) and has θJA = 55°C/W in standard JEDEC test board conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1 (Pins 3,4) | Inductor input-side connection | Connects to one end of the 1µH inductor; carries high di/dt switching current during both buck and boost phases. |
| LX2 (Pins 1,12) | Inductor output-side connection | Connects to other end of inductor; interfaces with internal H-bridge switches to enable bidirectional energy transfer. |
| VIN (Pins 5,6) | Main power input | Accepts 1.8V–5.5V supply; requires 10µF ceramic capacitor to PGND for stable input filtering and EMI suppression. |
| VOUT (Pin 11) | Regulated output | Delivers fixed 3.3V; requires 22µF or 47µF X5R ceramic capacitor to PGND for low-noise, high-transient-performance output. |
| BYPS (Pin 7) | Bypass mode control | Logic HIGH enables direct VIN-to-VOUT conduction path (no regulation); used to minimize quiescent current when downstream load is inactive. |
| EN (Pin 9) | Enable input | Active-HIGH logic signal; drives device into full shutdown (≤1µA) when pulled LOW, activating soft-discharge resistor (110Ω) on VOUT. |
| FB (Pin 10) | Feedback reference | Internally connected to VOUT in ISL9120IRTAZ-T7A (fixed-output variant); not externally accessible for adjustment. |
| GND (Pin 8) | Analog ground | Reference node for internal voltage reference and comparators; must be routed separately from PGND to avoid noise coupling. |
| PGND (Pin 2) | Power ground | High-current return path for LX1/LX2 switching nodes and input/output capacitors; connects directly to EPAD for optimal thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch buck-boost topology | Enables continuous regulation across VIN < VOUT and VIN > VOUT without external mode control or complex sequencing. |
| Adaptive PFM control | Dynamically optimizes switching frequency and peak current limit (350mA–2A, 32 levels) to maintain >90% efficiency from 10µA to 800mA load. |
| Automatic bypass mode | Engages when |VIN − VOUT| ≤ 1–2%, reducing output ripple and improving efficiency by eliminating switching losses entirely. |
| Forced bypass mode | Reduces total input current to ≤3.5µA via BYPS pin, ideal for powering LDOs or MCUs in deep-sleep states without compromising system wake-up latency. |
| Integrated protection suite | Includes thermal shutdown (150°C), UVLO (1.725V rising), and reverse-current blocking - eliminates need for external fault management circuitry. |
Applications
| Smartphone Power Management | Wearable Sensor Hub |
|---|---|
Use Scenario: Regulating battery voltage (2.8V–4.4V) to stable 3.3V rail for baseband processor, display interface, and audio codec. IC Role / Device Role / Timing Role: Primary buck-boost DC/DC converter providing uninterrupted power during battery discharge and USB charging transitions. Use Value: Maintains 3.3V output with <±1.5% load regulation across 0–800mA, enabling consistent digital logic timing and analog sensor accuracy despite wide VIN swing. | Use Scenario: Supplying 3.3V to motion sensors, BLE radio, and microcontroller in fitness tracker with coin-cell or thin-film battery. IC Role / Device Role / Timing Role: System-level power source managing dynamic load steps (e.g., BLE transmit burst) while minimizing quiescent consumption during sleep. Use Value: Delivers 98% peak efficiency and 41µA IQ in active mode, extending runtime; forced bypass mode cuts IQ to ≤3.5µA during MCU deep-sleep intervals. |
| Portable Medical Monitor | Industrial Handheld Terminal |
Use Scenario: Powering ECG front-end, OLED display, and wireless transceiver in battery-operated patient monitor with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete buck+boost stages, reducing BOM count and layout complexity. Use Value: Four-switch architecture eliminates mode-transition glitches (<10mV output disturbance), ensuring clean analog acquisition and real-time data transmission integrity. | Use Scenario: Providing regulated 3.3V for barcode scanner engine, touchscreen controller, and secure element in ruggedized field terminal. IC Role / Device Role / Timing Role: Robust power conditioner handling wide-input industrial batteries (2.5V–5.5V) and transient loads from motor-driven scanners. Use Value: Integrated thermal shutdown (150°C) and UVLO prevent malfunction during cold-start or hot ambient operation; 3×3mm TQFN eases thermal design in sealed enclosures. |
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 current; 2.5V–5.5V input; 10-pin 3×3mm VSON package; no forced bypass pin. | Higher current capability but lacks dedicated BYPS pin for ultra-low-IQ bypass mode; uses different soft-start implementation. | Select when higher output current (>800mA) is required and forced bypass is not needed; verify compatibility with existing PCB layout due to different pinout. |
| MAX77827BEWC+T | Adjustable output (0.6V–5.2V); 1.2A max output; 2.5V–5.5V input; 16-pin 3×3mm WLP; includes I²C interface for dynamic voltage scaling. | Programmable output and digital control add flexibility but increase firmware complexity; no forced bypass mode. | Choose when system requires dynamic output voltage adjustment or telemetry; not suitable as drop-in replacement due to different control interface and pin configuration. |
Compared with TPS63020DSJR and MAX77827BEWC+T, the ISL9120IRTAZ-T7A offers unique forced bypass functionality with sub-4µA quiescent current and seamless buck-boost transitions-critical for battery-sensitive portable designs where lowest possible standby power and glitch-free regulation are prioritized over programmability or higher current headroom.
Availability
ISL9120IRTAZ-T7A is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, portable medical monitors, and industrial handheld terminals requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9120IRTAZ-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
Intersil Corporation is a leading provider of precision analog and power management ICs, now part of Renesas Electronics, with expertise in high-efficiency DC/DC conversion and battery-powered system solutions.
The ISL9120IRTAZ-T7A belongs to Intersil's compact buck-boost regulator family designed specifically for space-constrained, battery-operated consumer and medical devices requiring wide-input regulation without external mode control or complex compensation networks.
FAQ
What is the output voltage configuration of the ISL9120IRTAZ-T7A?
The ISL9120IRTAZ-T7A is the fixed-output variant delivering 3.3V. Unlike the adjustable ISL9120IRAZ, it internally connects the FB pin to VOUT, eliminating the need for external resistors. This simplifies design, reduces BOM count, and improves accuracy by removing resistor tolerance and layout-induced errors. The 3.3V output is factory-trimmed to ±4% over temperature and line/load conditions.
How does the forced bypass mode function in the ISL9120IRTAZ-T7A?
In forced bypass mode, the ISL9120IRTAZ-T7A establishes a direct conduction path from VIN to VOUT using internal power transistors, disabling regulation and switching. Activated by driving the BYPS pin HIGH, this mode reduces input current to ≤3.5µA - ideal for powering downstream LDOs or MCUs during deep-sleep states. Note: overcurrent protection is disabled in bypass mode, so external current limiting is recommended if short-circuit risk exists.
What are the minimum external components required for the ISL9120IRTAZ-T7A?
The ISL9120IRTAZ-T7A requires only three external components: a 1µH shielded inductor (≥2A saturation current), a 10µF X5R ceramic input capacitor (rated ≥10V), and a 22µF or 47µF X5R ceramic output capacitor (rated ≥6.3V or ≥10V respectively). No feedback resistors, compensation networks, or feed-forward capacitors are needed due to its fixed-output architecture and internal compensation.
Does the ISL9120IRTAZ-T7A support automatic mode transition between buck and boost?
Yes, the ISL9120IRTAZ-T7A automatically and seamlessly transitions between buck and boost modes based on real-time VIN–VOUT relationship, without control pin intervention or output disturbance. When VIN approaches VOUT (within ~1–2%), it enters automatic bypass mode. These transitions are managed entirely by the internal PFM controller and voltage comparators, ensuring stable 3.3V output across the full 1.8V–5.5V input range.
What thermal management considerations apply to the ISL9120IRTAZ-T7A?
The ISL9120IRTAZ-T7A uses a 3mm×3mm TQFN package with an exposed thermal pad (EPAD) that must be soldered to a large copper pour for effective heat dissipation. With θJC = 5°C/W, proper thermal vias under the EPAD significantly reduce junction-to-board resistance. Thermal shutdown activates at +150°C (typical) with 35°C hysteresis, and the device resumes operation only after die temperature falls to +115°C - ensuring safe recovery without oscillation.
ISL9120IRTAZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-WFQFN Exposed Pad
- 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:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (3x3)
ISL9120IRTAZ-T7A FAQ
1.How can I place an order for ISL9120IRTAZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IRTAZ-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 ISL9120IRTAZ-T7A reliable?
The price and inventory of ISL9120IRTAZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IRTAZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL9120IRTAZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IRTAZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IRTAZ-T7A?
ISL9120IRTAZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IRTAZ-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 ISL9120IRTAZ-T7A?
For technical support, including ISL9120IRTAZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IRTAZ-T7A requirements.
6.How does Aetrix verify that ISL9120IRTAZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL9120IRTAZ-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 ISL9120IRTAZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL9120IRTAZ-T7A?
All ISL9120IRTAZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IRTAZ-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 ISL9120IRTAZ-T7A part is unused and in its original packaging.
Return procedure for ISL9120IRTAZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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