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Analog Devices Inc. LT8333RDD#PBF
- Part No.:
- LT8333RDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8333RDD#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:327
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Product details
Overview
LT8333RDD#PBF from Analog Devices is a current-mode DC/DC converter IC with a 40V, 3A internal power switch, supporting boost, SEPIC, and inverting topologies from 2.8V to 40V input. It delivers ultralow 9μA quiescent current in Burst Mode, maintains <15mV output ripple, and features programmable 300kHz–2MHz switching frequency-ideal for battery-powered industrial sensors and automotive auxiliary rails.
For engineers reviewing the LT8333RDD#PBF datasheet, LT8333RDD#PBF pinout, LT8333RDD#PBF application, or LT8333RDD#PBF equivalent, key selection considerations include its single FBX pin enabling both positive/negative output programming, BIAS pin for efficiency optimization, SYNC/MODE pin for EMI-reducing spread-spectrum modulation, and thermal performance in the 3mm × 3mm DFN package with exposed PGND pad.
Technical Context
The LT8333RDD#PBF implements fixed-frequency current-mode control with external RT resistor programming and dual error amplifiers-one optimized for +1.6V FBX regulation (boost/SEPIC), the other for –0.8V FBX regulation (inverting). Its Burst Mode architecture uses sleep cycles with 9μA VIN current to sustain regulation at microamp loads while limiting output ripple via controlled pulse delivery.
Switching behavior is governed by minimum on-time (70ns typical) and off-time (50ns typical), enabling stable operation across wide duty-cycle ranges. The SYNC/MODE pin supports five distinct configurations: Burst Mode, Pulse-Skip, external clock synchronization, Spread Spectrum Modulation (SSFM), or combinations thereof-each with defined voltage thresholds and functional trade-offs verified per Analog Devices' Rev. A datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 40V - supports direct connection to 12V/24V automotive batteries and wide-range industrial supplies without pre-regulation. |
| Switch Rating | 40V VSW, 3A peak current - enables 24V boost outputs up to ~1.8A at 19V input, validated in typical application circuits. |
| Quiescent Current | 9μA in Burst Mode - sustains regulation at light loads while minimizing battery drain in always-on portable systems. |
| Feedback Reference | +1.6V (boost/SEPIC) or –0.8V (inverting) - single FBX pin simplifies design across polarity-flexible applications without external level-shifting. |
| Switching Frequency | 300kHz to 2MHz (RT-programmable) - allows EMI-sensitive designs to avoid critical bands and optimize inductor size/cost. |
| Protection Features | Overcurrent (5.6A fault threshold), overtemperature (>170°C shutdown), UVLO with 80mV hysteresis - ensures robust operation under fault conditions without external circuitry. |
| Package Thermal Resistance | θJA = 43°C/W - exposed PGND pad requires PCB copper area for thermal management in high-power-density layouts. |
Pinout & Package
The LT8333RDD#PBF is housed in a thermally enhanced 10-lead 3mm × 3mm plastic DFN package (DD) with an exposed PGND pad (Pin 11) that must be soldered to a continuous PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | Logic-controlled shutdown; 1.6V rising threshold with 80mV hysteresis enables precise input voltage turn-on/turn-off programming. |
| VIN (2) | Main Input Supply | Primary power source for switch and internal circuitry; requires local low-ESR ceramic bypassing near EN/UVLO and SW pins. |
| INTVCC (3) | Internal 3.2V Regulator Output | Supplies gate drivers and logic; must be bypassed with ≥1µF ceramic capacitor; not externally loaded. |
| BIAS (4) | Secondary Input for INTVCC | Accepts 4.4V–VIN supply to divert INTVCC current from VIN, improving full-load efficiency in SEPIC or inverting configurations. |
| VC (5) | Error Amplifier Output | Connects to external compensation network (RC/CC); controls peak switch current via servo loop to FBX reference. |
| FBX (6) | Feedback Input | Single pin accepts resistor divider from output; selects +1.6V or –0.8V internal reference based on topology-no external components needed for polarity selection. |
| RT (7) | Frequency Programming | Resistor to PGND sets switching frequency from 300kHz to 2MHz; value calculated via RT = 51.2/fOSC – 5.6 (kΩ, fOSC in MHz). |
| SS (8) | Soft-Start Control | Capacitor to PGND programs inrush current ramp; 2μA charge current and 220Ω pull-down enable controlled start-up and fault recovery. |
| SYNC/MODE (9) | Mode Selection / Clock Input | Five modes: GND = Burst; float = Pulse-Skip; 100k-to-GND = Burst+SSFM; INTVCC = Pulse-Skip+SSFM; external clock = Sync+Pulse-Skip. |
| SW (10) | Power Switch Output | Drives external inductor/diode; trace minimization required to reduce EMI; connects directly to inductor in all topologies. |
| PGND/GND (11) | Power & Signal Ground | Exposed pad serves as primary thermal path and low-impedance return for switch current and signal grounds; must be soldered to PCB plane. |
Key Features
| Feature | Design Value |
|---|---|
| Single-FB Topology Flexibility | One feedback pin supports boost, SEPIC, and inverting configurations via automatic selection of +1.6V or –0.8V internal reference-eliminates topology-specific IC variants. |
| Burst Mode Efficiency | 9μA quiescent current maintains regulation at microamp loads while holding output ripple below 15mV-critical for battery longevity in IoT edge nodes. |
| EMI Reduction Architecture | Spread spectrum frequency modulation (±20% deviation at fOSC/256) and selectable sync/pulse-skip modes enable compliance with CISPR 25 Class 5 in automotive subsystems. |
| BIAS-Pin Efficiency Boost | Diverts INTVCC current from VIN when BIAS = 4.4V–VIN, reducing input supply burden and increasing full-load efficiency by up to 3% in SEPIC applications. |
| Robust Fault Protection | Integrated overcurrent (5.6A), overtemperature (>170°C), and UVLO with hysteresis prevent latch-up and component stress during transient faults-no external protection IC required. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Generating isolated 5V/3.3V rails from 12V vehicle battery for display controllers and CAN transceivers in infotainment head units. IC Role / Device Role / Timing Role: Primary DC/DC controller implementing SEPIC topology to maintain regulation during cold-crank (4.5V) and load-dump (40V) events. Use Value: 40V switch rating and 2.8V–40V input range eliminate need for front-end protection; Burst Mode extends battery runtime during standby. |
Use Scenario: Powering low-power wireless sensor nodes (LoRaWAN, NB-IoT) operating from single LiSOCl₂ cells or energy harvesters. IC Role / Device Role / Timing Role: Ultralow-IQ boost converter delivering regulated 3.3V from 2.8V–3.6V input with programmable soft-start to prevent brownout during RF transmission bursts. Use Value: 9μA quiescent current enables multi-year battery life; SSFM reduces conducted emissions to meet FCC Part 15 limits in compact enclosures. |
| Medical Portable Diagnostic Imaging | Telecom Remote Radio Unit Bias |
Use Scenario: Providing negative bias voltage (–12V) for CCD/CMOS image sensor analog front-ends in handheld ultrasound devices. IC Role / Device Role / Timing Role: Inverting converter using single FBX pin to generate stable –12V from 3.6V lithium polymer battery with minimal external components. Use Value: –0.8V FBX reference enables precise negative output programming; thermal DFN package fits space-constrained handheld form factors. |
Use Scenario: Generating 5V/12V auxiliary rails from 48V telecom bus for remote radio unit (RRU) FPGA configuration and bias sequencing. IC Role / Device Role / Timing Role: High-efficiency boost converter synchronized to system clock via SYNC pin to suppress switching noise coupling into sensitive RF receive paths. Use Value: External clock sync eliminates beat frequencies; 3A switch handles peak RRU startup currents without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8330EDD#PBF | Lacks BIAS pin and SSFM capability; max 2.5A switch current; identical 10-lead DFN package and FBX topology flexibility. | Suitable for cost-sensitive, lower-current (<1.5A) boost applications where EMI reduction and BIAS-driven efficiency are not required. | Select LT8330EDD#PBF only if BIAS pin functionality and spread-spectrum modulation are unnecessary for the target design. |
| TPS61088RHLR | 5.5V max input; 12A switch; no inverting/SEPIC support; integrated compensation; no SYNC/MODE pin for SSFM or external sync. | Optimized for high-current, single-cell Li-ion boost (e.g., USB PD power banks), not wide-input industrial or automotive use cases. | Choose TPS61088RHLR only for ≤5.5V input, >3A output applications where topology flexibility and ultra-low IQ are secondary to peak current capability. |
Compared with LT8330EDD#PBF and TPS61088RHLR, the LT8333RDD#PBF uniquely combines 40V input tolerance, 3A switch, single-FBX topology agility, and SSFM-making it the only option among the three for 24V automotive boost with EMI-critical timing constraints.
Availability
LT8333RDD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor networks, and portable medical diagnostics requiring stable component supply across extended temperature ranges (–40°C to 150°C).
Supply support for LT8333RDD#PBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.
The LT8333RDD#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters engineered for wide-input industrial and automotive power conversion where reliability, low IQ, and topology flexibility are mandatory.
FAQ
What is the maximum input voltage supported by the LT8333RDD#PBF?
The LT8333RDD#PBF supports an absolute maximum input voltage of 40V on the VIN and EN/UVLO pins, with guaranteed operation across 2.8V to 40V. This range accommodates automotive cold-crank (down to ~4.5V) and load-dump (up to 40V) transients without external clamping, making the LT8333RDD#PBF suitable for direct battery connection in 12V and 24V vehicle systems.
How does the LT8333RDD#PBF achieve ultralow quiescent current in Burst Mode?
The LT8333RDD#PBF achieves 9μA quiescent current in Burst Mode by entering deep sleep cycles between short current pulses delivered to the output capacitor. During sleep, internal circuitry-including the oscillator and gate driver-is powered down, while the FBX feedback loop remains active to monitor output voltage. This architecture sustains regulation at microamp loads while minimizing battery drain, a core capability confirmed in the LT8333RDD#PBF datasheet's Typical Performance Characteristics.
Can the LT8333RDD#PBF generate both positive and negative output voltages?
Yes-the LT8333RDD#PBF uses a single FBX pin with dual internal references (+1.6V for boost/SEPIC and –0.8V for inverting topologies) to support both polarities without external level shifters. When configured as an inverter, the FBX divider pulls the pin toward –0.8V, activating the second error amplifier; in boost mode, it pulls toward +1.6V. This topology flexibility is intrinsic to the LT8333RDD#PBF's architecture and verified in its Applications Information section.
What is the function of the BIAS pin on the LT8333RDD#PBF?
The BIAS pin on the LT8333RDD#PBF supplies the INTVCC regulator when biased between 4.4V and VIN, diverting up to ~10mA of internal regulator current away from the main VIN rail. This improves full-load efficiency-especially in SEPIC configurations where VOUT may exceed VIN-and reduces thermal stress on the input path. If unused, the BIAS pin must be tied to GND, as specified in the LT8333RDD#PBF Pin Functions documentation.
How is switching frequency programmed on the LT8333RDD#PBF?
Switching frequency on the LT8333RDD#PBF is set by an external resistor (RT) connected from Pin 7 (RT) to PGND. Values range from 20kΩ (2MHz) to 165kΩ (300kHz), with exact values tabulated in the datasheet. The relationship follows RT = 51.2/fOSC – 5.6 (kΩ, fOSC in MHz). This resistor-based programming enables precise EMI band avoidance and inductor optimization without requiring digital interfaces or configuration registers in the LT8333RDD#PBF.
LT8333RDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V, 1.6V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT8333RDD#PBF FAQ
1.How can I place an order for LT8333RDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8333RDD#PBF 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 LT8333RDD#PBF reliable?
The price and inventory of LT8333RDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8333RDD#PBF is usually 5 days.
3.What payment methods are accepted for LT8333RDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8333RDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8333RDD#PBF?
LT8333RDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8333RDD#PBF 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 LT8333RDD#PBF?
For technical support, including LT8333RDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8333RDD#PBF requirements.
6.How does Aetrix verify that LT8333RDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT8333RDD#PBF 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 LT8333RDD#PBF meets industry standards.
7.What is the process for return or replacement of LT8333RDD#PBF?
All LT8333RDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8333RDD#PBF, 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 LT8333RDD#PBF part is unused and in its original packaging.
Return procedure for LT8333RDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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