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Renesas ISL9120IINZ-T
- Part No.:
- ISL9120IINZ-T
- Manufacturer:
- Renesas
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
ISL9120IINZ-T.pdf
- Description:
- IC REG BCK BST 3.3V 800MA 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,732
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Product details
Overview
ISL9120IINZ-T from Renesas (formerly Intersil) is a compact, high-efficiency buck-boost switching regulator IC designed for single-inductor DC/DC conversion in space-constrained portable systems. It delivers up to 800mA output current at 3.3V with input range 1.8V–5.5V, supports automatic and forced bypass modes, and achieves up to 98% peak efficiency using adaptive PFM control.
For engineers reviewing the ISL9120IINZ-T datasheet, ISL9120IINZ-T pinout, ISL9120IINZ-T application, or ISL9120IINZ-T equivalent, key selection criteria include its 3mm×3mm 12-lead TQFN package, 41µA quiescent current in regulation mode, 3.5µA in forced bypass, seamless buck/boost transition behavior, and fixed 3.3V output configuration.
Technical Context
The ISL9120IINZ-T implements a synchronous four-switch buck-boost topology with integrated P-channel and N-channel MOSFETs (rDSON = 63mΩ each), enabling operation when input voltage is above, below, or near the regulated 3.3V output. Its adaptive multilevel current limit scheme dynamically adjusts peak inductor current from 350mA to 2A across 32 levels based on load demand.
Control logic includes dual ground separation (GND and PGND), undervoltage lockout (UVLO rising threshold 1.725V–1.790V), thermal shutdown at +150°C with +35°C hysteresis, and soft-start with 1ms delay before ramp initiation. The BYPS pin enables forced bypass mode, while EN provides full enable/disable control with <1µA shutdown current.
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; VOUT pin internally connected to FB. |
| Max Output Current | 800mA at VIN=2.5V, VOUT=3.3V - sufficient for powering PMIC rails, RF modules, or sensor subsystems in portable devices. |
| Quiescent Current | 41µA in regulation mode - maintains high light-load efficiency critical for always-on system functions. |
| Bypass Mode IQ | ≤3.5µA - enables ultra-low-power state when regulation is unnecessary (e.g., LDO standby). |
| Peak Efficiency | Up to 98% - minimizes thermal dissipation and extends battery runtime in high-current bursts. |
| Switching Architecture | Adaptive PFM with 32-level variable peak current limit - optimizes efficiency across 0–800mA load range without fixed-frequency EMI concerns. |
Pinout & Package
ISL9120IINZ-T is housed in a RoHS-compliant 3mm×3mm, 12-lead thin quad flat no-lead (TQFN) package with exposed thermal pad (PKG DWG # L12.3x3A). Pin numbering follows standard top-view orientation with pin 1 index area marked.
| 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 during both buck and boost phases. |
| LX2 (Pins 1,12) | Inductor output-side connection | Connects to opposite 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 stability and transient response. |
| VOUT (Pin 11) | Regulated output | Delivers fixed 3.3V; requires 22µF or 47µF low-ESR ceramic capacitor to PGND for ripple suppression and load step response. |
| BYPS (Pin 7) | Bypass mode control | Logic HIGH enables direct VIN-to-VOUT conduction path (no regulation); LOW enables full buck-boost regulation. |
| EN (Pin 9) | Enable input | Logic HIGH activates regulator; logic LOW disables device and engages 110Ω internal soft-discharge resistor between VOUT and GND. |
| FB (Pin 10) | Feedback reference | Internally tied to VOUT for fixed 3.3V operation; not externally accessible in ISL9120IINZ-T variant. |
| GND (Pin 8) | Analog ground | Reference for internal comparators and references; must be isolated from high-current PGND paths to avoid noise coupling. |
| PGND (Pin 2) | Power ground | Return path for LX1/LX2 switching currents; connects directly to input/output capacitor grounds and thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Reduces BOM count and PCB area vs. separate buck + boost solutions; eliminates need for dual inductors or complex controller ICs. |
| Automatic buck/boost mode transition | Seamlessly shifts operating mode without output voltage disturbance-critical for stable power delivery during battery discharge. |
| Forced bypass functionality | Enables sub-4µA quiescent current state when regulation is unnecessary, extending shelf life and standby time in IoT/wearable applications. |
| Integrated 63mΩ MOSFETs | Eliminates external switch losses and gate drive complexity; ensures consistent performance across temperature and process variation. |
| Separate GND and PGND pins | Prevents switching noise from corrupting analog reference accuracy-essential for maintaining ±3% output voltage regulation over temperature. |
Applications
| Smartphone Power Management | Wearable Health Monitor |
|---|---|
Use Scenario: Powers baseband processor core rail during dynamic voltage scaling as battery voltage drops from 4.2V to 3.0V. IC Role / Device Role / Timing Role: Primary system buck-boost regulator delivering stable 3.3V from declining single-cell Li-ion source. Use Value: Maintains uninterrupted operation without brownouts by automatically transitioning between buck and boost modes as VIN crosses VOUT. | Use Scenario: Supplies 3.3V to optical heart-rate sensor and BLE radio during intermittent active periods. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator feeding low-noise LDOs; enters forced bypass during sensor sleep cycles. Use Value: Achieves <3.5µA total system quiescent current in sleep mode while retaining fast wake-up capability via EN control. |
| Tablet USB-C PD Interface | Industrial Handheld Scanner |
Use Scenario: Provides 3.3V bias to USB-C port controller and level shifters when powered from variable 3.3–5.5V PD source. IC Role / Device Role / Timing Role: Input-flexible post-regulator ensuring stable 3.3V regardless of negotiated PD voltage (3.3V, 5V, 9V, 12V, 15V, 20V). Use Value: Eliminates need for multiple discrete regulators or complex voltage translation circuitry across wide input range. | Use Scenario: Powers barcode imaging sensor and microcontroller in battery-operated handheld scanner with 1.8–5.5V alkaline pack. IC Role / Device Role / Timing Role: Main DC/DC converter supporting deep discharge down to 1.8V while maintaining 3.3V output for digital logic and analog front-end. Use Value: Extends usable battery capacity by >25% compared to fixed-buck-only solutions that drop out below 3.3V input. |
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; 96% max efficiency; 2.5µA quiescent current in bypass; 2.5V–5.5V input range. | Lower IQ in bypass but narrower input range excludes 1.8–2.4V battery states; lacks automatic bypass hysteresis window. | Preferred where lowest possible standby current is critical and input never falls below 2.5V. |
| MAX77827AEWE+T | Adjustable output (0.6V–5.2V); 95% max efficiency; 3.5µA IQ in bypass; 2.5V–5.5V input range; I²C programmable. | Requires external resistors or I²C interface; no fixed 3.3V option; higher BOM cost and layout complexity. | Selected when output voltage flexibility or dynamic reconfiguration is required beyond fixed 3.3V. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the ISL9120IINZ-T uniquely supports full 1.8V–5.5V operation with automatic 1–2% bypass hysteresis, making it optimal for deep-discharge battery systems where input voltage spans both sides of the regulated output.
Availability
ISL9120IINZ-T is available at Aetrix Electronics and suitable for smartphone power management, wearable health monitors, tablet USB-C PD interfaces, and industrial handheld scanners requiring stable component supply with guaranteed long-term manufacturability.
Supply support for ISL9120IINZ-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 (acquired Intersil in 2017) is a global leader in microcontrollers, analog, power management, and SoC solutions, serving automotive, industrial, infrastructure, and consumer markets with ISO9001-certified manufacturing.
The ISL9120 product line was developed specifically for ultra-compact, high-efficiency power conversion in battery-powered portable electronics, emphasizing minimal external components, low quiescent current, and seamless input-voltage transitions.
FAQ
What is the maximum continuous output current supported by the ISL9120IINZ-T?
The ISL9120IINZ-T delivers up to 800mA of continuous output current under typical conditions (VIN = 2.5V, VOUT = 3.3V, TA = +25°C). This rating assumes proper thermal management using the exposed pad and recommended PCB copper area per the L12.3x3A package outline. At higher ambient temperatures or lower input voltages, derating applies per thermal resistance θJA = 55°C/W.
Does the ISL9120IINZ-T require external feedback resistors to set the output voltage?
No, the ISL9120IINZ-T is the fixed-output version with VOUT internally connected to FB, providing a factory-trimmed 3.3V output. External resistors are only required for the adjustable variant (ISL9120IRAZ). Attempting to add external resistors to ISL9120IINZ-T will disrupt regulation and is not supported.
How does the automatic bypass mode function in the ISL9120IINZ-T?
The ISL9120IINZ-T engages automatic bypass mode when VIN is within approximately 1% to 2% of VOUT (i.e., ~3.27–3.33V for 3.3V output), establishing a low-resistance path between VIN and VOUT through internal switches and the external inductor. This reduces quiescent current to ~3.5µA and minimizes output ripple without regulation overhead.
Can the ISL9120IINZ-T operate with an input voltage below 2.0V?
Yes, the ISL9120IINZ-T supports input voltages as low as 1.8V, enabling operation down to the end-of-discharge voltage of single-cell Li-ion or alkaline batteries. At 1.8V input, it operates exclusively in boost mode to maintain 3.3V output, with efficiency dropping predictably per Figure 2 in the datasheet.
What protection features are integrated into the ISL9120IINZ-T?
The ISL9120IINZ-T integrates undervoltage lockout (UVLO), overtemperature shutdown (+150°C trip with +35°C hysteresis), reverse current blocking, and internal current limiting. It does not include output overvoltage protection (OVP) or short-circuit foldback-external clamping or supervision may be needed in safety-critical applications.
ISL9120IINZ-T 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-T FAQ
1.How can I place an order for ISL9120IINZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IINZ-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 ISL9120IINZ-T reliable?
The price and inventory of ISL9120IINZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IINZ-T is usually 5 days.
3.What payment methods are accepted for ISL9120IINZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IINZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IINZ-T?
ISL9120IINZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IINZ-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 ISL9120IINZ-T?
For technical support, including ISL9120IINZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IINZ-T requirements.
6.How does Aetrix verify that ISL9120IINZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9120IINZ-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 ISL9120IINZ-T meets industry standards.
7.What is the process for return or replacement of ISL9120IINZ-T?
All ISL9120IINZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IINZ-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 ISL9120IINZ-T part is unused and in its original packaging.
Return procedure for ISL9120IINZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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