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Analog Devices Inc. LT8333RDD#TRPBF
- Part No.:
- LT8333RDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8333RDD#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,527
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Product details
Overview
LT8333RDD#TRPBF 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 requiring long runtime and stable rail generation.
For engineers reviewing the LT8333RDD#TRPBF datasheet, LT8333RDD#TRPBF pinout, LT8333RDD#TRPBF application, or LT8333RDD#TRPBF equivalent, key selection criteria include its single-feedback-pin topology flexibility, BIAS pin efficiency optimization, SYNC/MODE pin multi-mode control (Burst/Pulse-Skip/SSFM), and thermal performance in the 3mm × 3mm DFN package with exposed PGND pad.
Technical Context
The LT8333RDD#TRPBF employs fixed-frequency current-mode control with external RT-resistor-programmable oscillator (300kHz–2MHz) and dual error amplifiers enabling ±1.6V/±0.8V FBX regulation for both positive and negative output configurations. Its unique single FBX pin supports topology reconfiguration without hardware change.
It integrates programmable soft-start (2μA charge current), frequency foldback, overcurrent protection (5.6A switch limit), and thermal shutdown (>170°C). The BIAS pin supplies INTVCC from an auxiliary source (4.4V ≤ BIAS ≤ VIN), reducing VIN load and improving full-load efficiency by diverting ~1.2mA regulator current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 40V - supports wide-range industrial and automotive inputs including 12V/24V bus with brownout margin. |
| Quiescent Current (Burst Mode) | 9μA typical - enables >10-year battery life in always-on IoT sensor nodes at light loads. |
| Switch Rating | 40V VSW, 3A continuous - handles 24V boost to 48V or 12V inverting to –24V with margin for transients. |
| Feedback Regulation | +1.60V or –0.80V - single FBX pin supports both boost/SEPIC (+VOUT) and inverting (–VOUT) with no external logic. |
| Switching Frequency Range | 300kHz to 2MHz - adjustable via RT resistor; higher frequencies enable smaller magnetics and EMI filtering. |
| Package Thermal Resistance | θJA = 43°C/W - 10-lead 3mm × 3mm DFN with exposed PGND pad supports ≥2W dissipation at TA = 85°C. |
| Protection Features | Overcurrent (5.6A), overtemperature (>170°C), UVLO (1.6V rising threshold), and INTVCC UVLO - ensures robust operation under fault conditions. |
Pinout & Package
LT8333RDD#TRPBF is housed in a thermally enhanced 10-lead 3mm × 3mm plastic DFN package (DD) with exposed PGND pad (Pin 11) that must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 10) | Power Switch Drain | Connects to inductor/diode node; high dv/dt path requiring minimized trace area to reduce EMI. |
| FBX (Pin 6) | Feedback Input | Single pin accepts voltage divider from +VOUT (to 1.6V ref) or –VOUT (to –0.8V ref); enables topology reconfiguration. |
| SYNC/MODE (Pin 9) | Multi-function Control | Selects Burst Mode (GND), Pulse-Skip (float), SSFM (INTVCC), or external sync (square wave 0.4–6V). |
| BIAS (Pin 4) | Auxiliary Supply Input | Supplies INTVCC when 4.4V ≤ BIAS ≤ VIN - reduces VIN current draw and improves efficiency up to 3% at full load. |
| EN/UVLO (Pin 1) | Enable & UVLO Input | 1.6V rising threshold with 80mV hysteresis; <0.2V disables IC and reduces IVIN to <1μA for zero-power shutdown. |
| RT (Pin 7) | Oscillator Programming | Resistor to GND sets fSW: 165kΩ = 300kHz, 20kΩ = 2MHz - enables precise EMI band placement. |
| SS (Pin 8) | Soft-Start Control | 2μA constant-current charge; capacitor value sets ramp time - prevents inrush current and output overshoot. |
| VC (Pin 5) | Error Amplifier Output | Connects to external compensation network (R-C across VC–GND); sets loop bandwidth and phase margin. |
| VIN (Pin 2) | Main Input Supply | Must be locally bypassed with low-ESR ceramic cap; negative terminal tied to exposed PGND pad near EN/UVLO. |
| GND/PGND (Pin 11) | Power & Signal Ground | Exposed pad serves as primary thermal path and low-impedance return for SW, VIN, and FBX circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Single FBX Pin Topology Flexibility | Enables boost, SEPIC, or inverting configuration with identical layout - eliminates redesign for polarity change. |
| Burst Mode with 9μA IQ | Maintains regulation while drawing <10μA from battery - extends shelf life of portable medical diagnostics. |
| Spread Spectrum Frequency Modulation | ±20% fSW modulation at fSW/256 rate - reduces peak EMI by >10dB without added filtering components. |
| BIAS Pin Efficiency Boost | Diverts INTVCC current from VIN to auxiliary supply - improves full-load efficiency by up to 3% in SEPIC with VOUT > VIN. |
| Programmable UVLO with Hysteresis | 1.6V turn-on / 1.55V turn-off thresholds set via resistor divider - prevents oscillation during input brownout. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Remote temperature/humidity sensor powered by 3.6V LiSOCl₂ battery with 10-year lifetime requirement. IC Role / Device Role / Timing Role: Boost converter generating stable 5V rail from declining battery (2.8–3.6V), operating in Burst Mode at μA-level loads. Use Value: 9μA quiescent current enables >10-year operation; single FBX simplifies firmware-driven rail polarity switching for analog front-end calibration. |
Use Scenario: Powering CAN transceiver and microcontroller in door module from 9–16V vehicle battery with cold-crank immunity. IC Role / Device Role / Timing Role: SEPIC regulator delivering regulated 5V/3.3V rails during 4.5V cranking dips; BIAS pin supplied from 12V pre-regulator. Use Value: 40V switch rating withstands load-dump transients; programmable UVLO prevents reset during cranking; thermal DFN package sustains 85°C ambient. |
| Portable Medical Imaging Probe | Telecom Remote Radio Unit |
Use Scenario: Handheld ultrasound probe requiring ±15V analog rails from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Inverting converter generating –15V rail; boost converter generating +15V rail - both using same LT8333RDD#TRPBF layout. Use Value: Single FBX pin enables identical PCB for both rails; 15mV ripple meets ADC reference noise specs; soft-start prevents piezo transducer pop. |
Use Scenario: Outdoor small cell base station needing 24V bias for PA from 48V telecom rectifier with EMI compliance. IC Role / Device Role / Timing Role: Boost converter operating at 1.5MHz with SSFM; SYNC pin driven by system clock to align switching harmonics. Use Value: Spread spectrum + external sync meets EN55022 Class B limits; 2MHz capability allows compact 2.2μH inductor; thermal DFN survives 70°C enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8330EDD#TRPBF | Lower 2.5A switch rating, 28V max VSW, same 10-lead DFN package and pinout. | Suitable for ≤24V output boost or ≤12V inverting; lacks 40V margin for load-dump survival. | Select when cost sensitivity outweighs 40V/3A headroom; verify switch SOA for peak currents. |
| TPS61088RHLR | 5.5V max input, 12V max VSW, 8A switch, no BIAS pin or SSFM; 20-pin QFN package. | Limited to USB-powered or low-voltage systems; no negative output support; higher IQ (25μA). | Choose only for high-current, low-input-voltage apps where topology flexibility and EMI control are secondary. |
Compared with LT8333RDD#TRPBF, LT8330EDD#TRPBF offers lower cost but reduced voltage/current headroom, while TPS61088RHLR provides higher current at the expense of input range, topology flexibility, and EMI features - making LT8333RDD#TRPBF optimal for wide-input, multi-topology, low-EMI industrial designs.
Availability
LT8333RDD#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, portable medical imaging probes, and telecom remote radio units requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LT8333RDD#TRPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LT8333RDD#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters designed for high-efficiency, wide-input industrial and automotive power conversion with minimal external components.
FAQ
What is the maximum output voltage achievable with LT8333RDD#TRPBF in boost configuration?
The LT8333RDD#TRPBF does not impose a hard limit on output voltage in boost mode-the practical maximum is determined by external component ratings (diode, capacitor, inductor) and layout parasitics. With a 40V-rated internal switch and proper 63V+ output capacitor selection, LT8333RDD#TRPBF reliably generates 48V outputs from 12V input in validated reference designs. Always verify switch duty cycle constraints per Equation 4 in the datasheet.
Can LT8333RDD#TRPBF generate a negative output voltage, and how is it configured?
Yes, LT8333RDD#TRPBF supports inverting configuration for negative outputs via the same FBX pin. Connect the feedback divider from VOUT (negative rail) to FBX and from FBX to PGND; the internal –0.80V reference enables regulation. The block diagram (page 7) and Equation 6 confirm this topology. No external level-shifting or additional ICs are required-only resistor value adjustment.
Does LT8333RDD#TRPBF require external compensation, and what is the recommended network?
Yes, LT8333RDD#TRPBF requires external compensation connected between VC (Pin 5) and PGND. A standard Type II network-capacitor (CC) from VC to PGND and series RC–CC from VC to FBX-is recommended. Values depend on fSW, L, COUT, and VIN/VOUT; Analog Devices' LTpowerCAD tool generates optimized values. The VC pin's 75μA/V transconductance and 185V/V gain define loop response.
How does the BIAS pin improve efficiency in LT8333RDD#TRPBF, and what supply voltage range is valid?
The BIAS pin supplies the 3.2V INTVCC regulator, diverting ~1.2mA from VIN-reducing input current and improving full-load efficiency by up to 3%. Valid BIAS voltage is 4.4V ≤ VBIAS ≤ VVIN; below 4.4V, BIAS is ignored; above VIN, it's clamped. In SEPIC with VOUT > VIN, connecting BIAS to VOUT is common and effective.
What protection features are integrated into LT8333RDD#TRPBF, and how do they respond to faults?
LT8333RDD#TRPBF integrates overcurrent (5.6A switch limit), overtemperature (>170°C junction), input UVLO (1.6V rising), and INTVCC UVLO (2.5V falling). On fault detection, switching halts immediately, the SS pin is discharged via 220Ω MOSFET, and restart occurs only after fault clearance and soft-start ramp. No latch-up-auto-recovery design ensures robustness in transient-heavy environments.
LT8333RDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT8333RDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8333RDD#TRPBF 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#TRPBF reliable?
The price and inventory of LT8333RDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8333RDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8333RDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8333RDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8333RDD#TRPBF?
LT8333RDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8333RDD#TRPBF 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#TRPBF?
For technical support, including LT8333RDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8333RDD#TRPBF requirements.
6.How does Aetrix verify that LT8333RDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8333RDD#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8333RDD#TRPBF?
All LT8333RDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8333RDD#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT8333RDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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