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Analog Devices Inc. LT8334RDE#TRPBF
- Part No.:
- LT8334RDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT8334RDE#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,366
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Product details
Overview
LT8334RDE#TRPBF from Analog Devices is a current-mode DC/DC converter IC with a 40V, 5A 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 for industrial power supplies requiring high efficiency at light loads.
For engineers reviewing the LT8334RDE#TRPBF datasheet, LT8334RDE#TRPBF pinout, LT8334RDE#TRPBF application, or LT8334RDE#TRPBF equivalent, key selection criteria include its single-feedback-pin topology flexibility, BIAS pin for INTVCC efficiency optimization, SYNC/MODE pin for EMI-reducing spread-spectrum modulation, and thermal performance in the 4mm × 3mm DFN package.
Technical Context
The LT8334RDE#TRPBF implements fixed-frequency current-mode control with dual error amplifiers-one optimized for positive FBX regulation (1.60V reference) and another for negative outputs (–0.80V reference)-enabling topology-agnostic feedback via a single pin. Its oscillator supports precise frequency programming via RT resistor and external synchronization across 300kHz–2MHz.
Burst Mode operation uses sleep cycles with 9μA VIN current while delivering micro-pulses to sustain regulation; pulse-skipping mode maintains clock alignment for tighter transient response. Overcurrent protection triggers at 9.4A (SS pin discharge), and thermal shutdown activates above 170°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 40V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Switch Rating | 40V VSW, 5A peak current - enables high-power density designs with single-switch topologies up to 24V output. |
| Quiescent Current | 9μA in Burst Mode - extends battery life in always-on portable medical or sensor nodes. |
| Switching Frequency | 300kHz to 2MHz (programmable) - allows EMI-sensitive designs to avoid critical bands or optimize inductor size. |
| FBX Regulation Voltage | +1.60V or –0.80V - selects boost/SEPIC (+) or inverting (–) configuration without external op-amps. |
| BIAS Pin Threshold | 4.4V to VIN - enables efficient INTVCC sourcing from VOUT in SEPIC, reducing VIN load and improving full-load efficiency. |
| Soft-Start Charge Current | 2μA - sets controlled ramp rate with external SS capacitor, limiting inrush into output capacitors. |
Pinout & Package
The LT8334RDE#TRPBF is housed in a thermally enhanced 12-lead 4mm × 3mm plastic DFN package with exposed PGND pad (Pin 13) requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 2) | Enable and undervoltage lockout input | 1.6V rising threshold with 80mV hysteresis - enables system-level brownout protection and controlled startup sequencing. |
| VIN (Pin 3) | Main input supply | Accepts 2.8V–40V; local bypassing mandatory near pin and exposed pad - minimizes input loop inductance for stable high-current switching. |
| INTVCC (Pin 4) | Internal 3.2V regulator output | Must be bypassed with 1μF ceramic to GND - powers gate drivers and logic; not externally loaded. |
| BIAS (Pin 5) | Secondary supply for INTVCC | Enables >4.4V supply to reduce VIN current draw - improves efficiency in SEPIC where VOUT ≥ VIN. |
| VC (Pin 6) | Error amplifier output | Connects to external compensation network - sets loop bandwidth and phase margin for stability across operating conditions. |
| FBX (Pin 7) | Topology-selectable feedback input | Regulates to +1.60V (boost/SEPIC) or –0.80V (inverting) - eliminates need for separate reference or polarity-reversal circuitry. |
| RT (Pin 8) | Frequency programming input | Resistor-to-GND sets fSW from 300kHz–2MHz - enables EMI tuning and inductor size optimization. |
| SS (Pin 9) | Soft-start timing node | 2μA constant current charges external capacitor - controls inductor current slew rate during startup and fault recovery. |
| SYNC/MODE (Pin 10) | Mode selection and clock sync | Selects Burst/Pulse-Skip/SSFM/SYNC via voltage or resistor - provides EMI reduction, efficiency trade-off control, and system clock alignment. |
| SW1/SW2 (Pins 11,12) | Power switch drain terminals | Parallel 40V/5A MOSFET outputs - low RDS(ON) (70mΩ) reduces conduction loss; minimize trace area to limit EMI. |
| PGND/GND (Pin 13) | Power and signal ground | Exposed thermal pad - must be soldered to large copper area for θJA = 43°C/W and reliable 150°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| Single FBX pin topology selection | Eliminates external level-shifting or dual-reference circuits when designing both positive and negative output supplies. |
| Ultralow 9μA Burst Mode IQ | Maintains regulation in battery-powered devices for months without recharge while holding output ripple below 15mV. |
| Spread-spectrum frequency modulation | Reduces peak EMI by ±10% around fSW - meets CISPR 22 Class B limits without added shielding or filtering components. |
| Programmable soft-start | Prevents inductor saturation and output overshoot during cold start or fault recovery using user-defined SS capacitor value. |
| Thermally enhanced DFN package | 4mm × 3mm footprint with exposed PGND pad achieves 5.5°C/W junction-to-case thermal resistance - sustains 5A continuous operation at 125°C ambient. |
Applications
| Industrial Power Supplies | Automotive Infotainment |
|---|---|
Use Scenario: 12V vehicle battery powering 24V camera module with strict standby current budget. IC Role / Device Role / Timing Role: Boost converter delivering regulated 24V at up to 820mA from 4–20V input range, entering 9μA Burst Mode during camera sleep. Use Value: Extends vehicle battery life during parking mode while maintaining fast wake-up response via programmable soft-start. | Use Scenario: In-dash head unit requiring isolated –5V rail for audio codec biasing. IC Role / Device Role / Timing Role: Inverting converter generating –5V from 12V supply using single FBX pin configured for –0.80V reference. Use Value: Eliminates need for separate inverting controller or charge-pump IC, reducing BOM count and PCB area in space-constrained enclosures. |
| Portable Medical Diagnostics | Telecom Remote Radio Units |
Use Scenario: Handheld ultrasound device powered by Li-ion battery needing stable 15V analog supply. IC Role / Device Role / Timing Role: SEPIC converter providing 15V output across full battery discharge (3.0–4.2V), using BIAS pin connected to VOUT for >90% efficiency at full load. Use Value: Maintains consistent analog performance across battery life while minimizing heat generation in handheld enclosure. | Use Scenario: Outdoor small-cell base station requiring 48V intermediate bus from 24V backup battery. IC Role / Device Role / Timing Role: Boost converter operating at 1MHz with SSFM enabled on SYNC/MODE pin to meet FCC Part 15 radiated emissions limits. Use Value: Achieves compliance without ferrite beads or metal shielding, lowering system cost and weight in pole-mounted deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#TRPBF | Requires external MOSFETs; no integrated 5A switch; supports wider 4–36V input; higher 12V typical IQ. | Used in high-efficiency synchronous buck-boost designs where layout flexibility and thermal separation are prioritized over integration. | Select LTC3789EFE#TRPBF when discrete FET selection, higher output power (>30W), or multi-phase capability is required. |
| TPS61088RHLR | Integrated 10A switch but limited to 12V max VSW; fixed 500kHz/1MHz options; no negative output support; 25μA IQ. | Targeted at consumer USB-PD power banks and display backlighting where cost and compactness outweigh wide-VIN and topology flexibility. | Select TPS61088RHLR for cost-sensitive, low-voltage (<12V) boost applications with minimal external component count. |
Compared with LTC3789EFE#TRPBF and TPS61088RHLR, the LT8334RDE#TRPBF uniquely combines 40V switch rating, single-pin topology selection, and 9μA Burst Mode IQ in a 4mm × 3mm DFN-making it optimal for space-constrained, wide-input industrial and automotive converters needing both positive and negative outputs.
Availability
LT8334RDE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive infotainment systems, portable medical diagnostics, and telecom remote radio units requiring stable component supply with guaranteed long-term availability.
Supply support for LT8334RDE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LT8334RDE#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters, designed specifically for high-efficiency, wide-input industrial and automotive power conversion with minimal external components.
FAQ
What is the maximum output current capability of the LT8334RDE#TRPBF in boost configuration?
The LT8334RDE#TRPBF supports up to 2.75A output current at VIN = 16V and VOUT = 24V in boost configuration, as verified in the Typical Application circuit (TA01a). This assumes proper thermal management via the exposed PGND pad and use of recommended external components including a 2.2µH inductor and low-ESR output capacitors. Peak switch current is internally limited to 7.75A, but practical output current depends on duty cycle, thermal design, and efficiency losses.
How does the LT8334RDE#TRPBF achieve ultralow 9μA quiescent current?
The LT8334RDE#TRPBF achieves 9μA quiescent current in Burst Mode by entering deep sleep cycles between micro-pulse energy deliveries to the output capacitor. During sleep, most internal circuitry-including the oscillator and gate driver-is disabled, leaving only essential bias currents active. The FBX pin's regulation accuracy and minimum on-time control ensure stable output voltage maintenance while minimizing average input current across light-load conditions.
Can the LT8334RDE#TRPBF generate a negative output voltage, and how is it configured?
Yes, the LT8334RDE#TRPBF can generate a negative output voltage using inverting topology. Configuration requires connecting the FBX pin to a resistor divider between VOUT (negative rail) and PGND, which pulls FBX to –0.80V. The internal error amplifier A2 then regulates based on this negative reference, eliminating need for external inverting op-amps or level shifters. Full details are provided in the Applications Information section of the LT8334RDE#TRPBF datasheet.
What is the purpose of the BIAS pin on the LT8334RDE#TRPBF, and when should it be used?
The BIAS pin on the LT8334RDE#TRPBF supplies the INTVCC regulator when 4.4V ≤ BIAS ≤ VIN, diverting INTVCC current away from VIN to improve full-load efficiency. It is especially beneficial in SEPIC configurations where VOUT is close to or exceeds VIN-such as powering a 12V rail from a 9–36V input-allowing BIAS to be tied directly to VOUT. If unused, the BIAS pin must be tied to GND to prevent floating.
Does the LT8334RDE#TRPBF support external clock synchronization, and what are the voltage requirements?
Yes, the LT8334RDE#TRPBF supports external clock synchronization via the SYNC/MODE pin. The input square wave must have 20–80% duty cycle, valley voltage <0.4V, and peak voltage >1.7V (up to 6V). Synchronization is supported across 300kHz–2MHz, and the internal oscillator will lock to the external clock while maintaining pulse-skipping regulation. When synchronized, Burst Mode is disabled to ensure clock-aligned operation.
LT8334RDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-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):
- -
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 5A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LT8334RDE#TRPBF FAQ
1.How can I place an order for LT8334RDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8334RDE#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 LT8334RDE#TRPBF reliable?
The price and inventory of LT8334RDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8334RDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8334RDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8334RDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8334RDE#TRPBF?
LT8334RDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8334RDE#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 LT8334RDE#TRPBF?
For technical support, including LT8334RDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8334RDE#TRPBF requirements.
6.How does Aetrix verify that LT8334RDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8334RDE#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 LT8334RDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8334RDE#TRPBF?
All LT8334RDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8334RDE#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 LT8334RDE#TRPBF part is unused and in its original packaging.
Return procedure for LT8334RDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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