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Analog Devices Inc. LT8335EDDB#TRPBF
- Part No.:
- LT8335EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8335EDDB#TRPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
LT8335EDDB#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode DC/DC converter IC capable of boost, SEPIC, or inverting configurations with a 2A/28V internal power switch, 6µA quiescent current in Burst Mode, fixed 2MHz switching frequency, and single-pin programmable positive/negative output voltage regulation - used in low-power industrial sensors and portable medical diagnostics.
For engineers reviewing the LT8335EDDB#TRPBF datasheet, LT8335EDDB#TRPBF pinout, LT8335EDDB#TRPBF application, or LT8335EDDB#TRPBF equivalent, key selection criteria include ultralow IQ operation, integrated soft-start and frequency foldback, ±0.8V/1.6V FBX reference accuracy, DFN-8 (3mm × 2mm) thermal performance, and EN/UVLO programmability for input voltage supervision.
Technical Context
The LT8335EDDB#TRPBF implements fixed-frequency (2MHz) current-mode control with dual error amplifiers enabling topology-agnostic feedback: A1 active for boost/SEPIC (FBX referenced to +1.60V), A2 active for inverting (FBX referenced to –0.80V). Internal compensation eliminates external loop components.
It integrates frequency foldback triggered by low FBX voltage (<100mV), preventing inductor current runaway during start-up or fault conditions, and thermal lockout at 170°C with automatic soft-start recovery. INTVCC is a regulated 3V LDO powering gate drivers and internal circuitry, requiring ≥1µF ceramic bypassing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 25V - supports wide-input industrial and automotive supply rails without pre-regulation. |
| Quiescent Current (Burst Mode) | 6µA - enables multi-year battery life in always-on sensor nodes and portable diagnostics. |
| Switch Rating | 2A continuous, 28V max - handles peak loads up to 520mA at 6V input in boost mode without external FET. |
| FBX Regulation Voltage | +1.60V (positive VOUT) or –0.80V (negative VOUT) - single-pin topology selection simplifies PCB layout and BOM. |
| Switching Frequency | Fixed 2MHz (±10%) - allows use of sub-1µH inductors and compact ceramic output capacitors. |
| EN/UVLO Threshold | Rising: 1.68V, Falling: 1.60V (80mV hysteresis) - enables precise system-level brown-out protection via resistor divider. |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed thermal pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for θJA = 80.5°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | Primary power input; must be locally bypassed with ≥4.7µF X7R/X5R ceramic capacitor placed adjacent to pin. |
| SW | Switch Node | Drain of internal 2A/28V MOSFET; high di/dt node requiring minimal trace area and direct connection to inductor/diode. |
| FBX | Feedback Input | Single pin accepting either positive (1.60V ref) or negative (–0.80V ref) voltage divider - determines topology and regulates VOUT. |
| GND | Ground Reference | Signal and power return; Pin 4 and exposed pad (Pin 9) must both connect to low-impedance ground plane. |
| EN/UVLO | Enable & UVLO Control | Logic-level enable with accurate 1.60V/1.68V thresholds; <0.2V reduces VIN current to <1µA for ultra-low-power shutdown. |
| INTVCC | Internal 3V Regulator Output | Supplies gate drivers and internal logic; requires ≥1µF ceramic capacitor to GND; no external loading permitted. |
| NC | No Connection | Internally unconnected; must be tied to local GND for mechanical stability and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 6µA input current with <15mV output ripple - extends battery life while maintaining tight regulation at microamp loads. |
| Topology Flexibility | Single FBX pin configures boost, SEPIC, or inverting outputs - reduces design iterations and inventory SKUs. |
| Integrated Protection | Frequency foldback (low FBX), thermal lockout (170°C), and soft-start - prevents inductor saturation and output overshoot during startup/faults. |
| Programmable UVLO | Resistor-divider on EN/UVLO sets precise turn-on/off thresholds - replaces discrete supervisor ICs in power sequencing. |
| Internal Compensation | No external compensation components required - simplifies layout, improves reliability, and accelerates time-to-market. |
Applications
| Industrial Sensor Nodes | Portable Medical Diagnostics |
|---|---|
Use Scenario: Battery-powered gas sensor module operating continuously for >5 years on two AA cells. IC Role / Device Role / Timing Role: LT8335EDDB#TRPBF acts as primary boost regulator generating stable 3.3V rail from declining 1.8–3.0V battery input. Use Value: 6µA quiescent current minimizes standby drain; 2MHz operation enables tiny 1µH inductor and 4.7µF ceramic output cap for space-constrained PCB. | Use Scenario: Handheld ultrasound probe requiring isolated negative bias for transducer front-end. IC Role / Device Role / Timing Role: LT8335EDDB#TRPBF configured as inverting converter to generate –5V from 3.3V system rail using FBX referenced to –0.80V. Use Value: Single-feedback topology eliminates extra op-amps or charge pumps; low ripple Burst Mode ensures clean analog supply for sensitive ADCs. |
| Automotive Telematics | Telecom Remote Units |
Use Scenario: CAN-based vehicle tracker mounted in engine bay with wide-temp (-40°C to +125°C) requirements. IC Role / Device Role / Timing Role: LT8335EDDB#TRPBF serves as input-supervised boost converter delivering 5V to MCU and RF module from 6–16V battery. Use Value: EN/UVLO pin programmed for 9V turn-on/7.5V turn-off prevents brown-out resets; DFN package withstands thermal cycling per AEC-Q200. | Use Scenario: Outdoor small-cell base station powered by PoE+ with strict efficiency and size constraints. IC Role / Device Role / Timing Role: LT8335EDDB#TRPBF operates in SEPIC mode to regulate 12V output from 44–57V PoE input, providing isolation and hold-up capability. Use Value: Fixed 2MHz frequency enables compact magnetics; internal soft-start prevents inrush into downstream DC/DC converters during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8330EDDB#TRPBF | Lower switch current (1.2A), same 2MHz, identical pinout and FBX architecture. | Suitable only for ≤300mA output loads; lacks margin for transient peaks in industrial sensors. | Select when load current is consistently <250mA and cost optimization is prioritized over headroom. |
| TPS61088RHLR | Higher IQ (25µA), 2.2A switch, 2.5MHz, but only supports boost (no SEPIC/inverting) and requires external compensation. | Cannot replace LT8335EDDB#TRPBF in negative-rail or input-wide-range SEPIC designs without topology redesign. | Choose only for simple boost applications where 19µA higher IQ is acceptable and layout area permits compensation network. |
Compared with LT8335EDDB#TRPBF, LT8330EDDB#TRPBF trades current capability for lower cost in light-load boost-only systems, while TPS61088RHLR offers higher frequency and current but sacrifices topology flexibility and adds design complexity through external compensation.
Availability
LT8335EDDB#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical diagnostics, and automotive telematics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8335EDDB#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification standards.
The LT8335EDDB#TRPBF belongs to the LT® monolithic DC/DC converter family, designed specifically for ultralow-power, wide-input industrial and portable applications demanding topology flexibility and robust thermal performance.
FAQ
What is the maximum output current achievable with LT8335EDDB#TRPBF in boost configuration?
The LT8335EDDB#TRPBF delivers up to 520mA at 6V input and 12V output in boost mode, limited by its 2A internal switch, thermal dissipation in the DFN package, and inductor saturation current. Peak output current decreases at lower input voltages (e.g., 275mA at 3V input) due to duty-cycle constraints and higher switch conduction losses. Designers must verify inductor RMS/peak ratings and PCB copper area for thermal management per application.
Can LT8335EDDB#TRPBF generate both positive and negative output voltages on the same PCB?
Yes, the LT8335EDDB#TRPBF can generate either polarity using the same FBX pin: connect a resistor divider from positive VOUT to GND for +1.60V regulation, or from negative VOUT to GND for –0.80V regulation. However, each instance of LT8335EDDB#TRPBF supports only one topology at a time - dual-rail designs require two separate LT8335EDDB#TRPBF ICs or a different controller.
How does the LT8335EDDB#TRPBF achieve 6µA quiescent current in Burst Mode?
The LT8335EDDB#TRPBF achieves 6µA quiescent current by fully disabling non-essential circuitry between bursts - including oscillator, gate driver, and error amplifier - while retaining regulation via periodic sampling of FBX voltage. During sleep periods, only the bandgap reference and burst comparator remain active. This architecture minimizes static current while keeping output ripple below 15mV in typical applications.
Is external compensation required for stable operation of LT8335EDDB#TRPBF?
No, the LT8335EDDB#TRPBF features fully internal compensation optimized for ceramic output capacitors. Its control loop is factory-tuned to ensure stability across all supported topologies (boost, SEPIC, inverting) and standard component values. External compensation components are neither recommended nor required - adding them may destabilize the regulator or degrade transient response.
What thermal design guidelines apply to the LT8335EDDB#TRPBF DFN package?
The LT8335EDDB#TRPBF requires soldering of its exposed thermal pad (Pin 9) to a dedicated PCB ground plane with ≥4 thermal vias (0.3mm diameter) connecting to inner-layer copper pours. Pin 4 (GND) must also connect to the same ground plane. Total thermal resistance θJA is 80.5°C/W with this layout; insufficient copper area or missing vias will cause junction temperatures to exceed 125°C under full load, triggering thermal lockout.
LT8335EDDB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 3V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 1.6V, -0.8V
- Voltage - Output (Max):
- 28V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LT8335EDDB#TRPBF FAQ
1.How can I place an order for LT8335EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8335EDDB#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 LT8335EDDB#TRPBF reliable?
The price and inventory of LT8335EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8335EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8335EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8335EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8335EDDB#TRPBF?
LT8335EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8335EDDB#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 LT8335EDDB#TRPBF?
For technical support, including LT8335EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8335EDDB#TRPBF requirements.
6.How does Aetrix verify that LT8335EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8335EDDB#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 LT8335EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8335EDDB#TRPBF?
All LT8335EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8335EDDB#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 LT8335EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT8335EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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