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Renesas ISL9120IRTNZ-T
- Part No.:
- ISL9120IRTNZ-T
- Manufacturer:
- Renesas
- Package:
- 12-WFQFN Exposed Pad
- Datasheet:
-
ISL9120IRTNZ-T.pdf
- Description:
- IC REG BCK BST 3.3V 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
ISL9120IRTNZ-T from Intersil is a compact, high-efficiency buck-boost switching regulator IC that delivers up to 800mA output current with fixed 3.3V output, operates across 1.8V–5.5V input range, and features automatic buck/boost mode transition and dual bypass functionality (automatic and forced). It serves as a single-inductor power supply for battery-powered portable electronics requiring stable voltage under varying input conditions.
For engineers reviewing the ISL9120IRTNZ-T datasheet, ISL9120IRTNZ-T pinout, ISL9120IRTNZ-T application, or ISL9120IRTNZ-T equivalent, key selection considerations include its 3mm×3mm 12-lead TQFN package, 41µA quiescent current in PFM mode, 3.5µA forced-bypass current draw, integrated adaptive multilevel current limit, and thermal shutdown at 150°C with 35°C hysteresis.
Technical Context
The ISL9120IRTNZ-T implements a pulse-frequency modulation (PFM) control architecture with adaptive multilevel peak current limiting (32 levels from 350mA to 2A), enabling optimized efficiency across light-to-heavy load conditions. Its topology uses four internal MOSFETs (P- and N-channel) controlled by anti-shoot-through logic to execute seamless transitions between buck, boost, and bypass modes.
It employs separate analog (GND) and power (PGND) ground pins, a dedicated BYPS pin for forced bypass activation, and an EN pin with 1.4V VIH threshold. Soft-start initiates 1ms after EN assertion, and soft-discharge engages via a 110Ω internal resistor when EN is low.
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 batteries without external pre-regulation. |
| Output Voltage | Fixed 3.3V - eliminates need for external feedback resistors; VOUT pin internally connected to FB in this variant. |
| Max Output Current | 800mA at VIN=2.5V, VOUT=3.3V - sufficient for powering baseband processors, RF transceivers, and sensor hubs in portable devices. |
| Quiescent Current | 41µA in PFM mode - maximizes battery runtime during light-load operation such as system standby. |
| Bypass Mode Current | ≤3.5µA (typical 0.8µA) - enables ultra-low-power state when regulation is unnecessary, e.g., feeding an LDO in sleep mode. |
| Efficiency | Up to 98% - achieved via adaptive current limit and low RDS(ON) (63mΩ P- and N-channel FETs) minimizing conduction losses. |
| Thermal Shutdown | 150°C with 35°C hysteresis - protects against sustained overload or poor PCB thermal design while ensuring safe auto-recovery. |
Pinout & Package
Package: 3mm × 3mm, 12-lead Thin Quad Flat No-Lead (TQFN) with exposed thermal pad (RoHS-compliant, moisture sensitivity level per TB363).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1 (pins 3,4) | Inductor input-side connection | Carries high-current switching node for buck-mode operation; requires low-impedance routing to minimize EMI and voltage spikes. |
| LX2 (pins 1,12) | Inductor output-side connection | Switching node for boost-mode operation; shares inductor with LX1, enabling single-inductor buck-boost topology. |
| VIN (pins 5,6) | Main power input | Accepts 1.8V–5.5V; must be decoupled with ≥10µF ceramic capacitor to PGND to suppress ripple and support transient response. |
| VOUT (pin 11) | Regulated output | Delivers fixed 3.3V; requires 22µF or 47µF X5R ceramic capacitor to PGND for stability and low output ripple. |
| BYPS (pin 7) | Bypass mode enable | Logic HIGH activates direct VIN-to-VOUT path; no overcurrent protection active in this mode-external current limiting required. |
| EN (pin 9) | Enable control | Active-HIGH logic input (VIH = 1.4V); drives device into full shutdown (<1µA) when pulled LOW. |
| FB (pin 10) | Feedback reference | Internally tied to VOUT in ISL9120IRTNZ-T; not used externally-no resistor divider needed for fixed-output configuration. |
| GND (pin 8) | Analog ground | Reference for internal comparators and references; must be isolated from high-switching PGND to prevent noise coupling. |
| PGND (pin 2) | Power ground | Return path for high di/dt switching currents; requires low-inductance connection to input/output capacitors' ground pads. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Reduces BOM count and PCB area vs. dual-converter solutions-only one 1µH inductor, one 10µF input cap, and one 22–47µF output cap required. |
| Adaptive multilevel current limit | 32 programmable peak current thresholds (350mA–2A) dynamically adjusted via PFM burst count-maintains >90% efficiency from 1mA to 800mA loads. |
| Automatic bypass mode | Engages when |VIN − VOUT| ≤ 1–2%, delivering near-zero dropout and <10mVpp output ripple-ideal for battery voltage tracking applications. |
| Forced bypass mode | Enables sub-4µA total supply current by disabling regulation circuitry-used to power downstream LDOs or PMIC rails during deep-sleep states. |
| Integrated thermal protection | Shuts down at 150°C junction temperature and resumes at 115°C-prevents permanent damage without requiring external thermal sensors or firmware intervention. |
Applications
| Smartphone Power Management | Wearable Health Monitor |
|---|---|
Use Scenario: Powers application processor I/O and memory 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: Buck-boost regulator maintaining stable 3.3V supply regardless of battery state, eliminating need for separate buck and boost converters. Use Value: Extends usable battery capacity by 12–15% compared to fixed-input regulators, while reducing solution size by 35% versus dual-stage designs. | Use Scenario: Supplies sensor hub and BLE radio in a wrist-worn fitness tracker operating intermittently with long standby periods. IC Role / Device Role / Timing Role: Primary power source with forced bypass mode activated during 95% of sleep time to minimize quiescent draw. Use Value: Achieves 3.5µA system standby current, enabling >30-day battery life on a 120mAh coin cell without compromising active-mode performance. |
| Tablet Baseband Subsystem | Portable Medical Diagnostic Device |
Use Scenario: Delivers 3.3V to cellular modem and GPS receiver in a ruggedized tablet exposed to wide ambient temperature ranges. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter with thermal shutdown and UVLO protection ensuring reliable operation from −40°C to +85°C. Use Value: Maintains >92% efficiency across −20°C to +70°C, reducing thermal stress on adjacent components and avoiding derating in sealed enclosures. | Use Scenario: Powers ECG front-end amplifier and microcontroller in a handheld cardiac monitor powered by two AA alkaline cells (1.8V–3.2V range). IC Role / Device Role / Timing Role: Input-flexible regulator compensating for battery voltage drop during high-current pulse measurements. Use Value: Enables consistent 3.3V rail accuracy (±3%) across full input range, preserving ADC reference integrity and signal-to-noise ratio. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS63020DSJR | Fixed 3.3V output, 2A max current, 2.5V–5.5V input, 2.5mm×2.5mm 11-pin WSON package, 25µA quiescent current in PFM mode. | Higher current capability but larger inductor requirement (2.2µH); lacks forced bypass mode-uses only automatic bypass. | Select when >800mA load or smaller footprint is critical; verify thermal performance with higher peak current. |
| Analog Devices ADP5070ACPZ-R7 | Adjustable output (1.2V–5.5V), 250mA max, 2.85V–15V input, 3mm×3mm 16-pin LFCSP, includes integrated LDO post-regulator. | Lower output current and wider input range; designed for precision analog biasing, not high-efficiency portable power. | Select only for low-noise, low-current applications requiring post-regulation; not suitable as direct replacement for ISL9120IRTNZ-T's 800mA capability. |
Compared with TPS63020DSJR and ADP5070ACPZ-R7, the ISL9120IRTNZ-T offers superior light-load efficiency (41µA vs. 25µA/120µA), dedicated forced bypass for ultra-low-power states, and tighter output accuracy (±3% vs. ±5%/±1.5% typical), making it optimal for space-constrained, battery-sensitive portable systems.
Availability
ISL9120IRTNZ-T is available at Aetrix Electronics and suitable for smartphones, tablets, and wearable health monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9120IRTNZ-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
Intersil Corporation is a leading provider of power management and precision analog ICs, now part of Renesas Electronics, with expertise in high-efficiency DC/DC conversion and battery-aware power architectures.
The ISL9120IR product line was designed specifically for ultra-compact, high-efficiency power delivery in portable consumer electronics where input voltage varies widely and quiescent current directly impacts battery life.
FAQ
What is the maximum continuous output current supported by the ISL9120IRTNZ-T?
The ISL9120IRTNZ-T delivers up to 800mA of continuous output current under specified conditions: VIN = 2.5V, VOUT = 3.3V, TA = +25°C, using a 1µH inductor and recommended ceramic capacitors. At higher input voltages (e.g., VIN = 4V), output current capability remains robust but is thermally limited by PCB layout and ambient conditions. The device incorporates overtemperature protection that disables switching if junction temperature exceeds 150°C.
Does the ISL9120IRTNZ-T require external feedback resistors to set the output voltage?
No, the ISL9120IRTNZ-T is the fixed-output variant with VOUT internally connected to the FB pin, delivering a precise 3.3V output without external resistors. This simplifies design and improves accuracy by eliminating resistor tolerance and layout-induced errors. In contrast, the adjustable version ISL9120IRAZ requires an external resistor divider (e.g., 187kΩ and 60.4kΩ) to set VOUT.
How does the forced bypass mode function in the ISL9120IRTNZ-T, and what are its limitations?
Forced bypass mode in the ISL9120IRTNZ-T is activated by driving the BYPS pin HIGH, creating a direct conductive path from VIN to VOUT through internal MOSFETs. This mode draws ≤3.5µA total supply current but provides no voltage regulation or overcurrent protection. It is intended for use cases like powering an LDO in standby-never for direct load connection without external current limiting or fault protection.
What package type and thermal characteristics does the ISL9120IRTNZ-T use?
The ISL9120IRTNZ-T uses a 3mm × 3mm, 12-lead TQFN package (PKG DWG # L12.3x3A) with an exposed thermal pad. Its thermal resistance is θJA = 55°C/W (free-air) and θJC = 5°C/W (junction-to-case), enabling efficient heat transfer to the PCB. The device includes thermal shutdown at 150°C with 35°C hysteresis, ensuring safe recovery without manual reset.
Can the ISL9120IRTNZ-T operate with input voltages below 2.0V, and what protections apply?
Yes, the ISL9120IRTNZ-T supports input voltages as low as 1.8V, making it compatible with deeply discharged Li-ion or multi-cell alkaline sources. It includes undervoltage lockout (UVLO) with rising threshold of 1.725–1.790V and falling threshold of 1.550–1.650V, preventing erratic operation during brown-out conditions. Below UVLO, the device remains disabled until VIN rises above the hysteresis band.
ISL9120IRTNZ-T 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:
- 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:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (3x3)
ISL9120IRTNZ-T FAQ
1.How can I place an order for ISL9120IRTNZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IRTNZ-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 ISL9120IRTNZ-T reliable?
The price and inventory of ISL9120IRTNZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IRTNZ-T is usually 5 days.
3.What payment methods are accepted for ISL9120IRTNZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IRTNZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IRTNZ-T?
ISL9120IRTNZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IRTNZ-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 ISL9120IRTNZ-T?
For technical support, including ISL9120IRTNZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IRTNZ-T requirements.
6.How does Aetrix verify that ISL9120IRTNZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9120IRTNZ-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 ISL9120IRTNZ-T meets industry standards.
7.What is the process for return or replacement of ISL9120IRTNZ-T?
All ISL9120IRTNZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IRTNZ-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 ISL9120IRTNZ-T part is unused and in its original packaging.
Return procedure for ISL9120IRTNZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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