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Analog Devices Inc. LT8334RDE#PBF
- Part No.:
- LT8334RDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT8334RDE#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:394
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Product details
Overview
LT8334RDE#PBF from Analog Devices is a current-mode DC/DC converter IC with a 40V, 5A integrated 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 high light-load efficiency and compact power conversion.
For engineers reviewing the LT8334RDE#PBF datasheet, LT8334RDE#PBF pinout, LT8334RDE#PBF application, or LT8334RDE#PBF equivalent, key selection criteria include its single FBX pin enabling both positive/negative output programming, BIAS pin for INTVCC efficiency optimization, SYNC/MODE pin for EMI-reducing spread-spectrum modulation, and thermal performance in the 4mm × 3mm DFN package with exposed PGND pad.
Technical Context
The LT8334RDE#PBF employs fixed-frequency current-mode control with internal slope compensation, where peak inductor current is regulated via the VC pin voltage set by the error amplifier comparing FBX against ±1.6V/±0.8V references. Its dual-regulation architecture supports topology-agnostic feedback: +1.6V reference for boost/SEPIC (FBX pulled up), –0.8V reference for inverting (FBX pulled down).
Switching behavior is dynamically managed through the SYNC/MODE pin, enabling five distinct operational modes-including Burst Mode (≤9μA IQ), pulse-skipping, external clock synchronization, and spread-spectrum modulation-each with defined voltage thresholds and functional trade-offs verified in the Electrical Characteristics table across –40°C to 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 40V - supports wide-range industrial and automotive inputs without pre-regulation. |
| Quiescent Current (Burst) | 9μA typical - enables multi-year battery life in always-on remote sensors. |
| Switch Rating | 40V VSW, 5A continuous - handles high-side switch stress in boost/SEPIC and bidirectional current in inverting configurations. |
| Feedback Reference | +1.6V or –0.8V - single FBX pin supports both positive and negative output programming without external op-amps. |
| Switching Frequency | 300kHz to 2MHz (programmable via RT resistor) - balances EMI, size, and efficiency across input/output conditions. |
| BIAS Pin Function | Accepts 4.4V–VIN supply to power INTVCC - reduces VIN load and improves full-load efficiency by >2% in SEPIC designs. |
| Protection Features | Overcurrent (9.4A fault threshold), overtemperature (>170°C shutdown), UVLO with 80mV hysteresis - ensures robust operation under fault conditions. |
Pinout & Package
The LT8334RDE#PBF is housed in a thermally enhanced 12-lead 4mm × 3mm plastic DFN package with an exposed PGND pad (Pin 13) that must be soldered to a continuous PCB ground plane for thermal and electrical integrity. θJA = 43°C/W, θJC = 5.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 2) | Enable and undervoltage lockout input | 1.6V turn-off / 1.68V turn-on threshold with 80mV hysteresis - enables precise system-level brownout protection. |
| VIN (Pin 3) | Main input supply | 2.8V–40V input path; requires local low-ESR ceramic bypass near exposed PGND copper. |
| INTVCC (Pin 4) | Internal 3.2V LDO output | Supplies internal circuitry; must be bypassed with 1µF ceramic capacitor - no external loading permitted. |
| BIAS (Pin 5) | Secondary supply for INTVCC | Enables efficiency gain when 4.4V ≤ BIAS ≤ VIN - e.g., direct connection to VOUT in SEPIC for reduced input current. |
| VC (Pin 6) | Error amplifier output | Drives external compensation network (R-C-RC) to stabilize loop across wide VIN/VOUT ranges. |
| FBX (Pin 7) | Topology-agnostic feedback input | Connects to resistor divider; selects +1.6V (boost/SEPIC) or –0.8V (inverting) regulation reference automatically. |
| RT (Pin 8) | Frequency programming input | Resistor-to-GND sets fSW from 300kHz to 2MHz - enables EMI tuning and inductor size optimization. |
| SS (Pin 9) | Soft-start timing node | 2µA constant-current charge controls inductor current ramp rate - prevents overshoot and inductor saturation at startup. |
| SYNC/MODE (Pin 10) | Multi-function control input | Selects Burst/Pulse-Skip/SYNC/SSFM modes via voltage level or external clock - critical for EMI compliance and light-load efficiency. |
| SW1/SW2 (Pins 11,12) | Power switch outputs | 40V, 5A drain-source terminals; minimize trace area to reduce radiated EMI. |
| PGND/GND (Pin 13) | Power and signal ground | Exposed thermal pad - must be soldered to large copper pour for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Single FBX topology selection | Automatically configures error amplifier for +1.6V (boost/SEPIC) or –0.8V (inverting) regulation - eliminates external mode-select logic. |
| Spread-spectrum modulation (SSFM) | ±14–28% frequency deviation at fOSC/256 rate - reduces peak EMI by >10dB without filter redesign. |
| Programmable soft-start | 2µA SS pin charge current with 220Ω internal pull-down - enables adjustable startup time and controlled inrush limiting. |
| Ultralow IQ Burst Mode | 9μA typical input current at light loads - extends battery runtime while maintaining <15mV output ripple. |
| BIAS-assisted INTVCC supply | Reduces VIN current draw by >90% at full load when BIAS = VOUT - improves system efficiency in SEPIC applications. |
Applications
| Industrial Sensor Node Power | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powering 3.3V/5V microcontrollers and analog front-ends in battery-operated vibration/temperature sensors deployed in harsh factory environments. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC converter providing regulated output from 6–36V vehicle or industrial bus rails. Use Value: 9μA Burst Mode IQ enables >5-year battery life; 40V switch rating withstands load-dump transients; DFN package fits space-constrained enclosures. |
Use Scenario: Generating isolated or non-isolated auxiliary rails (e.g., ±12V, 5V) for LIN transceivers, LED drivers, and window motor controllers. IC Role / Device Role / Timing Role: Flexible topology converter supporting inverting (for negative bias) and boost (for 12V→15V) within same BOM. Use Value: Single FBX pin simplifies firmware-independent hardware design; SSFM meets CISPR 25 Class 5 EMI limits; –40°C to 150°C rating matches under-hood requirements. |
| Portable Medical Diagnostic Equipment | Telecom Remote Radio Unit |
|
Use Scenario: Powering precision ADCs, op-amps, and wireless SoCs in handheld ultrasound or glucose monitors with Li-ion or coin-cell sources. IC Role / Device Role / Timing Role: High-efficiency step-up converter delivering stable 3.3V/5V from 2.8–4.2V battery input with minimal noise coupling. Use Value: <15mV output ripple preserves signal integrity; programmable soft-start prevents sensor reset during power-on; low EMI avoids RF interference with Bluetooth/Wi-Fi. |
Use Scenario: Providing 5V/12V bias for GaN FET drivers and 3.3V for FPGA configuration in outdoor small-cell base stations powered by 48V PoE or solar. IC Role / Device Role / Timing Role: Wide-input buck-boost converter handling 24–60V input variations while maintaining tight output regulation. Use Value: 2.8V–40V input range accommodates degraded 48V systems; SYNC pin enables clock alignment with baseband processor to suppress beat frequencies. |
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#PBF | Requires external MOSFETs; supports higher output current (10A+); no integrated 5A switch. | Better suited for high-power (>20W) applications needing custom FET selection and phase interleaving. | Choose LTC3789EFE#PBF only when output power exceeds 15W or when discrete FET thermal management is required. |
| TPS61178RSLT | Lower 2.7V–18V input range; 2.5A switch; no inverting capability; fixed 2.1MHz frequency. | Targeted at consumer portable devices with strict size constraints but narrower voltage and topology support. | Choose TPS61178RSLT only for cost-sensitive, low-power (<5W), single-topology (boost-only) designs with <18V input. |
Compared with LTC3789EFE#PBF and TPS61178RSLT, the LT8334RDE#PBF uniquely integrates 40V/5A switching, single-pin topology selection, and ultralow 9μA IQ - making it optimal for space- and battery-constrained industrial and medical converters requiring flexible voltage polarity and wide input range.
Availability
LT8334RDE#PBF is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, portable medical diagnostics, telecom remote units, and battery-powered instrumentation requiring stable component supply, long-lifecycle assurance, and guaranteed traceability.
Supply support for LT8334RDE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LT8334RDE#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters engineered for high efficiency, ultralow quiescent current, and topology flexibility in space- and energy-constrained applications.
FAQ
What topology configurations does the LT8334RDE#PBF support?
The LT8334RDE#PBF supports three standard DC/DC topologies: boost (step-up), SEPIC (single-ended primary-inductor converter), and inverting (negative output). Its unique single FBX pin automatically selects between +1.6V regulation for boost/SEPIC and –0.8V regulation for inverting operation based on the feedback divider connection - eliminating external mode-selection circuitry and simplifying PCB layout for multi-rail designs.
How does the BIAS pin improve efficiency in the LT8334RDE#PBF?
The BIAS pin on the LT8334RDE#PBF accepts a secondary supply (4.4V ≤ BIAS ≤ VIN) to power the internal 3.2V INTVCC regulator, diverting up to 95% of INTVCC current away from the main VIN rail. In SEPIC applications where VOUT is often lower than VIN, connecting BIAS to VOUT reduces total input current and improves full-load efficiency by 2–3 percentage points - directly measurable in thermal imaging and runtime testing of the LT8334RDE#PBF.
What is the minimum recommended FBX divider resistor value for optimal light-load efficiency in the LT8334RDE#PBF?
For optimal light-load efficiency, the LT8334RDE#PBF FBX divider resistors should be selected ≥25kΩ (R2) and scaled accordingly using Equation 5 or 6. Higher values (e.g., 100kΩ–1MΩ) minimize divider current - which appears as additional output load - thereby preserving the 9μA Burst Mode IQ. Using 1% metal-film resistors ensures ±0.5% output voltage accuracy across temperature without requiring calibration.
Can the LT8334RDE#PBF synchronize to an external clock, and what are the voltage requirements?
Yes, the LT8334RDE#PBF can synchronize to an external clock applied to the SYNC/MODE pin. The input square wave must have valleys <0.4V and peaks >1.7V (up to 6V), with 20–80% duty cycle, and operate within 300kHz–2MHz. When synchronized, the LT8334RDE#PBF disables Burst Mode and uses pulse-skipping instead - ensuring deterministic timing for EMI reduction and avoiding beat frequencies in multi-converter systems.
What thermal design considerations apply to the LT8334RDE#PBF's exposed pad (Pin 13)?
The LT8334RDE#PBF's exposed pad (Pin 13) is electrically PGND/GND and thermally critical: it must be soldered to a solid, unbroken copper pour ≥250 mm² with ≥4 thermal vias (0.3mm diameter) to an internal ground plane. This achieves θJA = 43°C/W. Failure to properly connect the pad raises junction temperature by >30°C at 2A load - risking thermal shutdown and accelerated aging. Thermal relief patterns or isolated pads are strictly prohibited.
LT8334RDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-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):
- -
- 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#PBF FAQ
1.How can I place an order for LT8334RDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8334RDE#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 LT8334RDE#PBF reliable?
The price and inventory of LT8334RDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8334RDE#PBF is usually 5 days.
3.What payment methods are accepted for LT8334RDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8334RDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8334RDE#PBF?
LT8334RDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8334RDE#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 LT8334RDE#PBF?
For technical support, including LT8334RDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8334RDE#PBF requirements.
6.How does Aetrix verify that LT8334RDE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8334RDE#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 LT8334RDE#PBF meets industry standards.
7.What is the process for return or replacement of LT8334RDE#PBF?
All LT8334RDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8334RDE#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 LT8334RDE#PBF part is unused and in its original packaging.
Return procedure for LT8334RDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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