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Renesas ISL9120IRTAZ-T
- Part No.:
- ISL9120IRTAZ-T
- Manufacturer:
- Renesas
- Package:
- 12-WFQFN Exposed Pad
- Datasheet:
-
ISL9120IRTAZ-T.pdf
- Description:
- IC REG BUCK BST ADJ 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ISL9120IRTAZ-T from Renesas (formerly Intersil) is a compact, high-efficiency buck-boost switching regulator IC designed for single-inductor voltage regulation where input may fall above or below the output. It delivers up to 800mA at 3.3V with 1.8V–5.5V input range, features automatic buck/boost mode transition, and supports both fixed (3.3V) and adjustable output configurations in portable power management.
For engineers reviewing the ISL9120IRTAZ-T datasheet, ISL9120IRTAZ-T pinout, ISL9120IRTAZ-T application, or ISL9120IRTAZ-T equivalent, key selection considerations include its adaptive PFM control architecture, forced bypass functionality via BYPS pin, 41µA quiescent current in regulation mode, thermal shutdown at 150°C, and compatibility with low-ESR ceramic capacitors and 1µH shielded inductors.
Technical Context
The ISL9120IRTAZ-T implements a synchronous four-switch buck-boost topology with integrated P-channel and N-channel MOSFETs (rDSON = 63mΩ each), enabling seamless transitions between buck, boost, and automatic bypass modes without output disturbance. Its adaptive multilevel current limit scheme dynamically adjusts peak inductor current from 350mA to 2A across 32 levels based on load demand.
It uses separate analog (GND) and power (PGND) ground pins to isolate sensitive reference circuitry from high di/dt switching currents, and incorporates soft-start (1ms typical), soft-discharge (110Ω internal VOUT-to-GND resistor), UVLO (1.725V rising threshold), and thermal shutdown with 35°C hysteresis for robust system-level protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-poly, or dual-cell alkaline/battery-backed systems without pre-regulation. |
| Output Current | Up to 800mA at VOUT = 3.3V, VIN = 2.5V - sufficient for powering PMIC rails, RF transceivers, or application processors in portable devices. |
| Quiescent Current | 41µA in regulation mode - maximizes battery runtime during light-load operation in always-on subsystems. |
| Efficiency | Up to 98% - achieved via adaptive PFM control and low RDS(ON) internal switches, reducing thermal stress in space-constrained layouts. |
| Package | 3mm × 3mm, 12-lead TQFN (L12.3x3A) - enables ultra-compact DC/DC solutions with minimal PCB footprint and thermal resistance (θJA = 55°C/W). |
| Bypass Mode Current | <3.5µA when BYPS = HIGH - enables ultra-low-power state for auxiliary rails during system sleep without external LDO. |
| FB Pin Voltage | 0.80V - sets output voltage in adjustable configuration using external resistor divider; enables precise VOUT programming from 1.0V to 5.2V. |
Pinout & Package
ISL9120IRTAZ-T is housed in a RoHS-compliant 3mm × 3mm, 12-lead Thin Quad Flat No-lead (TQFN) package with exposed thermal pad (EPAD). The package supports reflow soldering per IPC/JEDEC J-STD-020 and has θJC = 5°C/W for efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1 (Pins 3,4) | Inductor input-side connection | Connects to one end of the single external inductor; carries high di/dt switching current in 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 transient response. |
| VOUT (Pin 11) | Regulated output | Delivers regulated voltage; requires 22µF or 47µF X5R ceramic capacitor to PGND for low ripple and fast load transient recovery. |
| BYPS (Pin 7) | Forced bypass enable | Logic HIGH activates direct VIN-to-VOUT conduction path, disabling regulation and reducing IQ to <3.5µA. |
| EN (Pin 9) | Enable control | Active-HIGH logic input; drives LOW to enter shutdown with <1µA supply current and activate soft-discharge resistor. |
| FB (Pin 10) | Feedback reference node | Senses output voltage via external resistor divider (adjustable version) or connects directly to VOUT (fixed 3.3V version). |
| GND (Pin 8) | Analog ground | Reference return for internal bandgap, error amplifier, and comparators; must be isolated from high-current PGND paths. |
| PGND (Pin 2) | Power ground | High-current return path for LX1/LX2 switching nodes and input/output capacitors; minimizes ground bounce and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Seamless switching between topologies maintains ±1.5% output regulation without glitch during VIN crossing VOUT - critical for battery-powered systems with decaying voltage. |
| Adaptive multilevel current limit | 32-step peak current limit (350mA–2A) optimized via PFM pulse counting - improves light-load efficiency while sustaining full 800mA output capability. |
| Forced bypass functionality | Direct VIN-to-VOUT path activated by BYPS pin reduces quiescent current to <3.5µA - ideal for powering standby LDOs or MCU retention rails. |
| Integrated thermal protection | Thermal shutdown at 150°C with 35°C hysteresis ensures safe operation under overload or poor heatsinking - eliminates need for external thermal monitoring. |
| Low-noise soft-start | 1ms delay + controlled reference ramp limits inrush current and output overshoot - prevents brownout in shared input rails and simplifies system power sequencing. |
Applications
| Smartphone Power Management | Wearable Device Core Rail |
|---|---|
Use Scenario: Regulating battery voltage (2.8V–4.2V) to stable 3.3V for baseband processor, memory, and sensors during dynamic load changes. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing continuous voltage stabilization across full battery discharge curve. Use Value: Eliminates need for separate buck and boost converters, reducing BOM count and PCB area while maintaining >95% efficiency at 100mA–500mA loads. |
Use Scenario: Supplying 1.8V core voltage to ultra-low-power MCU in fitness tracker with intermittent sensor activation and long sleep cycles. IC Role / Device Role / Timing Role: Adjustable-output buck-boost converter operating in forced bypass during deep-sleep mode to minimize system IQ. Use Value: Achieves sub-5µA total system sleep current by combining 3.5µA bypass mode with MCU's own retention state. |
| Tablet Display Backlight Driver Support | Portable Medical Sensor Hub |
Use Scenario: Generating 5.0V bias rail from 3.7V Li-ion battery for white LED backlight driver IC requiring stable input despite battery sag. IC Role / Device Role / Timing Role: Fixed-output buck-boost stage delivering regulated 5.0V (via external resistor divider) to LED driver input. Use Value: Maintains constant LED brightness over full battery range without audible coil whine due to PFM operation and low EMI layout compatibility. |
Use Scenario: Powering analog front-end (AFE), ADC, and Bluetooth LE radio in handheld ECG monitor with strict EMC and battery life requirements. IC Role / Device Role / Timing Role: Dual-rail generator producing 3.3V digital and 2.5V analog supplies from single battery source using two ISL9120IRTAZ-T instances. Use Value: Enables clean, low-noise analog performance via separate GND/PGND routing and <1% load regulation (0.0072 mV/mA) at 100mA. |
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 | Higher max output current (1.2A), wider input range (1.8V–5.5V), but higher quiescent current (25µA vs 41µA in regulation mode) and no forced bypass pin. | Preferred for higher-current loads like USB OTG ports; lacks dedicated bypass control for ultra-low-IQ sleep states. | Select when peak load exceeds 800mA and forced bypass is not required; verify thermal performance with 2.1W dissipation at full load. |
| MAX77827AEWE+T | Integrated I2C interface, programmable VOUT (0.6V–5.2V), lower IQ (12µA), but larger 16-pin WLP package and no automatic bypass mode. | Suitable for software-configurable power trees in smart IoT devices; requires firmware integration and adds communication overhead. | Choose when dynamic voltage scaling or telemetry is needed; avoid if board space is constrained or analog-only control is preferred. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the ISL9120IRTAZ-T offers superior integration of automatic bypass, dedicated BYPS pin for hardware-controlled ultra-low-power states, and smallest footprint among 800mA-class buck-boost regulators - making it optimal for size- and IQ-sensitive portable designs.
Availability
ISL9120IRTAZ-T is available at Aetrix Electronics and suitable for smartphone power management, wearable device core rails, and portable medical sensor hubs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for ISL9120IRTAZ-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 Corporation (formerly Intersil) is a global leader in microcontrollers, analog power, and SoC solutions, serving automotive, industrial, and consumer markets with ISO9001-certified manufacturing and reliability-tested products.
The ISL9120IRTAZ-T belongs to Renesas' high-efficiency portable power management portfolio, engineered specifically for space-constrained, battery-operated devices demanding wide-input regulation, ultra-low quiescent current, and seamless topology transitions.
FAQ
What is the maximum output current capability of the ISL9120IRTAZ-T?
The ISL9120IRTAZ-T delivers up to 800mA of continuous output current when configured for 3.3V output with 2.5V input, as validated in the FN8743 datasheet. This rating assumes proper thermal management using the 3mm×3mm TQFN package's exposed pad and recommended PCB copper area. Peak inductor current limit is internally set to 2A, but sustained output is limited by thermal constraints and efficiency derating at higher loads.
Does the ISL9120IRTAZ-T support adjustable output voltage?
Yes, the ISL9120IRTAZ-T supports adjustable output voltage via the FB pin using an external resistor divider. The internal reference is 0.80V, so VOUT = 0.8V × (1 + R1/R2). For example, R1 = 187kΩ and R2 = 60.4kΩ yields 3.3V. The fixed-output variant (ISL9120IRTNZ) connects VOUT directly to FB, but ISL9120IRTAZ-T is the adjustable version and requires the divider per Figure 17 in FN8743 Rev 1.00.
How does the forced bypass mode function in the ISL9120IRTAZ-T?
In forced bypass mode, asserted HIGH on the BYPS pin enables a direct conduction path from VIN to VOUT through internal power transistors and the external inductor, disabling regulation and reducing quiescent current to less than 3.5µA. This mode is intended for scenarios where voltage regulation is unnecessary - such as powering an LDO in standby - and requires minimum 800µs duration per FN8743 Section "Functional Description".
What are the recommended external components for the ISL9120IRTAZ-T?
The ISL9120IRTAZ-T requires only three external components for basic operation: a 1µH shielded inductor rated ≥2A saturation current (e.g., TDK TFM201610GHM-1R0MTAA), a 10µF X5R ceramic input capacitor (0603, 10V), and a 22µF or 47µF X5R ceramic output capacitor (0603, 6.3V or 10V). For adjustable versions, add R1/R2 divider and optional 22pF feed-forward capacitor per Equation 1 in the datasheet.
Is the ISL9120IRTAZ-T RoHS compliant and what is its moisture sensitivity level?
Yes, the ISL9120IRTAZ-T is RoHS compliant with 100% matte tin (e3) termination finish and meets IPC/JEDEC J-STD-020 reflow requirements. Its Moisture Sensitivity Level (MSL) is Level 3 per JEDEC standards, requiring floor life management and bake-out per TB363 if exposed beyond 168 hours at ≤30°C/60% RH. Full MSL details are published on the Renesas product information page for ISL9120.
ISL9120IRTAZ-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:
- 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-T FAQ
1.How can I place an order for ISL9120IRTAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IRTAZ-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 ISL9120IRTAZ-T reliable?
The price and inventory of ISL9120IRTAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IRTAZ-T is usually 5 days.
3.What payment methods are accepted for ISL9120IRTAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IRTAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IRTAZ-T?
ISL9120IRTAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IRTAZ-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 ISL9120IRTAZ-T?
For technical support, including ISL9120IRTAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IRTAZ-T requirements.
6.How does Aetrix verify that ISL9120IRTAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9120IRTAZ-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 ISL9120IRTAZ-T meets industry standards.
7.What is the process for return or replacement of ISL9120IRTAZ-T?
All ISL9120IRTAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IRTAZ-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 ISL9120IRTAZ-T part is unused and in its original packaging.
Return procedure for ISL9120IRTAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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