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Renesas ISL9120IRTNZ
- Part No.:
- ISL9120IRTNZ
- Manufacturer:
- Renesas
- Package:
- 12-WFQFN Exposed Pad
- Datasheet:
-
ISL9120IRTNZ.pdf
- Description:
- IC REG BCK BST 3.3V 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,258
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Product details
Overview
ISL9120IRTNZ from Intersil is a compact, high-efficiency buck-boost switching regulator IC designed for single-inductor voltage regulation where input may be above or below the 3.3V fixed output. It delivers up to 800mA output current (VIN = 2.5V, VOUT = 3.3V), features automatic and forced bypass modes, and operates across 1.8V–5.5V input with <3.5µA quiescent current in forced bypass-ideal for battery-powered portable devices requiring seamless mode transitions.
For engineers reviewing the ISL9120IRTNZ datasheet, ISL9120IRTNZ pinout, ISL9120IRTNZ application, or ISL9120IRTNZ equivalent, key selection considerations include its 3mm×3mm 12-lead TQFN package, adaptive PFM control architecture, dual-mode (buck/boost) operation without output disturbance, and support for both fixed 3.3V output and external feedback configuration.
Technical Context
The ISL9120IRTNZ implements a synchronous four-switch buck-boost topology with integrated P-channel and N-channel MOSFETs (rDSON_P = rDSON_N = 63mΩ), enabling automatic, seamless transitions between buck and boost modes based on VIN–VOUT differential. Its adaptive multilevel current limit scheme dynamically adjusts peak inductor current from 350mA to 2A across 32 levels to optimize efficiency at light and heavy loads.
It integrates undervoltage lockout (UVLO rising threshold: 1.725V–1.790V), thermal shutdown (+150°C trip, +115°C hysteresis), soft-start (1ms typical delay + ramp), and soft-discharge (110Ω internal resistor activated on EN low). The device uses separate GND and PGND pins to isolate analog reference and high-current switching paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports wide battery voltage range including single-cell Li-ion (3.0–4.2V) and dual-cell alkaline (2.4–3.2V). |
| Output Voltage | Fixed 3.3V - no external resistor divider required; VOUT pin internally connected to FB for factory-trimmed regulation. |
| Max Output Current | 800mA at VIN = 2.5V, VOUT = 3.3V - sufficient for powering baseband processors, PMIC rails, or RF front-ends in portable systems. |
| Quiescent Current | 41µA in PFM mode; ≤3.5µA in forced bypass - extends battery life during system sleep or standby states. |
| Efficiency | Up to 98% - achieved via adaptive PFM control and low RDS(on) internal switches, minimizing power loss across load range. |
| Package | 3mm × 3mm, 12-lead TQFN (RoHS-compliant, L12.3x3A) - enables ultra-compact PCB layout with minimal external components (1 inductor, 2 capacitors). |
| Protection Features | Thermal shutdown (+150°C), UVLO, reverse current blocking, and overtemperature hysteresis (35°C) - ensures robust operation under fault conditions without external circuitry. |
Pinout & Package
ISL9120IRTNZ is housed in a 3mm × 3mm, 12-lead thin quad flat no-lead (TQFN) package with exposed thermal pad (EPAD) for enhanced heat dissipation. Pin numbering follows standard top-view orientation with pin 1 located at the index corner.
| 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-frequency switching current during both buck and boost phases. |
| LX2 (Pins 1, 12) | Inductor output-side connection | Connects to the other end of the 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 fixed 3.3V; must connect 22µF or 47µF X5R ceramic capacitor to PGND for ripple suppression and load step stability. |
| BYPS (Pin 7) | Bypass mode control | Logic HIGH enables direct VIN-to-VOUT conduction path (no regulation); used for ultra-low-power standby with <3.5µA IQ. |
| EN (Pin 9) | Enable input | Active-HIGH logic control; drives LOW to disable regulator and activate soft-discharge (110Ω pull-down to GND). |
| FB (Pin 10) | Feedback reference | Internally tied to VOUT for fixed-output operation; left unconnected externally per datasheet Figure 18. |
| GND (Pin 8) | Analog ground | Reference node for internal voltage references 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; connects directly to input/output capacitor grounds and EPAD. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic buck-boost mode transition | Seamlessly shifts between buck and boost topologies as VIN crosses VOUT, eliminating output voltage glitch or dropout during battery discharge. |
| Forced bypass functionality | Enables direct VIN-to-VOUT conduction via internal switches when regulation is unnecessary-reducing IQ to ≤3.5µA for extended system sleep. |
| Adaptive multilevel current limit | 32-step peak current limit (350mA–2A) adjusted in real time by PFM pulse count, maximizing efficiency across 0–800mA load range. |
| Integrated protection suite | Includes thermal shutdown with 35°C hysteresis, UVLO with 1.725V rising threshold, and reverse current blocking-no external protection components needed. |
| Single-inductor architecture | Reduces BOM count and board area vs. dual-converter solutions; supports 1µH inductor with ≥2A saturation rating and low DCR for optimal performance. |
Applications
| Smartphones | Wearable Health Monitors |
|---|---|
Use Scenario: Powering application processor I/O rails and sensor hubs during dynamic battery voltage sag (e.g., 4.2V → 3.0V). IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 3.3V supply regardless of input voltage drift. Use Value: Eliminates need for separate buck and boost converters, reducing solution size by >40% and simplifying power tree design. | Use Scenario: Supplying ultra-low-power MCU and optical heart-rate sensor during multi-day battery operation. IC Role / Device Role / Timing Role: System-level voltage regulator with forced bypass mode engaged during sensor idle periods. Use Value: Cuts system quiescent current by 37µA (vs. active PFM mode), extending battery life from 5 to 7+ days. |
| Tablets | Wireless Earbuds |
Use Scenario: Delivering consistent 3.3V to display interface and touch controller across full Li-ion discharge curve. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter supporting 800mA peak loads during screen refresh and audio playback. Use Value: Achieves >95% efficiency at 500mA load, minimizing thermal rise in thermally constrained tablet chassis. | Use Scenario: Regulating charging case output to earbud battery management IC during intermittent charging cycles. IC Role / Device Role / Timing Role: Compact, low-noise buck-boost stage interfacing between USB-C PD input and embedded LDO. Use Value: Enables use of single 1µH inductor and two 0603 capacitors, fitting within <8mm² PCB area in charging case. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS63020DSJR | Fixed 3.3V output; 2A max output current; 2.5V–5.5V input; 1.7mm × 2.2mm 12-pin WSON package. | Higher current capability and smaller footprint, but lacks forced bypass mode and has higher 25µA quiescent current in deep sleep. | Preferred for space-constrained designs needing >1A load support; not suitable where sub-4µA bypass IQ is mandatory. |
| Analog Devices ADP5070ACPZ-R7 | Adjustable output (±1.2V to ±15V); 150mA max per rail; requires external resistors and compensation; 3mm × 3mm 16-lead LFCSP. | Designed for precision dual-rail generation, not single-rail fixed-output portable power; no bypass functionality. | Only appropriate for bipolar or programmable output requirements; incompatible for drop-in replacement in ISL9120IRTNZ's 3.3V fixed-role applications. |
Compared with TPS63020DSJR and ADP5070ACPZ-R7, the ISL9120IRTNZ uniquely balances ultra-low bypass IQ (<3.5µA), seamless buck-boost transition, and minimal external component count in a production-qualified 3mm×3mm TQFN-making it optimal for cost-sensitive, battery-life-critical consumer portables.
Availability
ISL9120IRTNZ 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 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 (now part of Renesas Electronics) is a leader in precision analog and power management ICs, serving mobile computing, industrial infrastructure, and high-end consumer markets with high-reliability, energy-efficient solutions.
The ISL9120IRTNZ belongs to Intersil's compact buck-boost regulator product line, engineered specifically for battery-powered portable electronics where input voltage varies widely and board space is severely constrained.
FAQ
What is the recommended inductor value and saturation current rating for ISL9120IRTNZ?
The ISL9120IRTNZ datasheet specifies a 1µH inductor with ≥2A saturation current rating. Recommended part series include Toko DFE201610R-H-1R0M (2.0×1.6×1.0mm, 2.7A Isat), Cyntec PIFE20161T-1R0MS (2.8A Isat), and TDK TFM201610GHM-1R0MTAA (3.8A Isat). Low DCR and ferrite core material are critical for efficiency and thermal performance in the ISL9120IRTNZ application.
Does ISL9120IRTNZ require external feedback resistors for 3.3V output?
No. The ISL9120IRTNZ is the fixed-output variant with factory-trimmed 3.3V regulation. Per datasheet Figure 18, the FB pin is internally connected to VOUT; no external resistors or capacitors are needed on the FB node. External feedback is only required for the adjustable version (ISL9120IRAZ).
How does the forced bypass mode function in ISL9120IRTNZ, and what are its limitations?
In ISL9120IRTNZ, forced bypass mode is activated by driving the BYPS pin HIGH, creating a direct conduction path from VIN to VOUT through internal switches and the external inductor. This mode draws ≤3.5µA quiescent current but provides no voltage regulation or overcurrent protection. It must not be used during power-up and requires ≥800µs minimum duration and ≥1ms recovery time before re-entry.
What are the thermal characteristics and PCB layout recommendations for ISL9120IRTNZ?
The ISL9120IRTNZ has θJA = 55°C/W and θJC = 5°C/W (3×3mm TQFN). Key layout practices include: placing input (10µF) and output (22µF/47µF) capacitors adjacent to respective pins; routing PGND connections directly to the EPAD and capacitor grounds on the component layer (no vias); separating GND and PGND traces; and using a solid copper pour under the EPAD for thermal dissipation.
Can ISL9120IRTNZ operate with input voltages below 2.0V, and what is its UVLO behavior?
Yes, ISL9120IRTNZ supports input down to 1.8V. Its undervoltage lockout (UVLO) has a rising threshold of 1.725V–1.790V and falling threshold of 1.550V–1.650V. When VIN drops below the falling threshold, the regulator disables; it remains off until VIN rises above the rising threshold, ensuring clean startup and preventing erratic operation near battery depletion.
ISL9120IRTNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-WFQFN Exposed Pad
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for ISL9120IRTNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IRTNZ 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 reliable?
The price and inventory of ISL9120IRTNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IRTNZ is usually 5 days.
3.What payment methods are accepted for ISL9120IRTNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IRTNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IRTNZ?
ISL9120IRTNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IRTNZ 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?
For technical support, including ISL9120IRTNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IRTNZ requirements.
6.How does Aetrix verify that ISL9120IRTNZ is sourced from the original manufacturer or authorized distributors?
All ISL9120IRTNZ 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 meets industry standards.
7.What is the process for return or replacement of ISL9120IRTNZ?
All ISL9120IRTNZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IRTNZ, 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 part is unused and in its original packaging.
Return procedure for ISL9120IRTNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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