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Analog Devices Inc. LT8335IDDB#PBF
- Part No.:
- LT8335IDDB#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8335IDDB#PBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,280
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Product details
Overview
LT8335IDDB#PBF from Analog Devices (formerly Linear Technology) is a current-mode DC/DC converter IC supporting boost, SEPIC, and inverting topologies with a single FBX feedback pin. It integrates a 2A/28V power switch, operates from 3V to 25V input, delivers ultralow 6µA quiescent current in Burst Mode, and maintains <15mV output ripple-ideal for battery-powered medical diagnostics and portable electronics requiring long standby life.
For engineers reviewing the LT8335IDDB#PBF datasheet, LT8335IDDB#PBF pinout, LT8335IDDB#PBF application, or LT8335IDDB#PBF equivalent, key selection criteria include its fixed 2MHz switching frequency, programmable UVLO via EN/UVLO pin, internal compensation, ±0.8V/1.6V dual FBX reference, and thermal lockout at 170°C-critical for reliable operation in automotive and industrial environments.
Technical Context
The LT8335IDDB#PBF employs fixed-frequency current-mode control with internal slope compensation, enabling stable regulation across wide VIN (3–25V) and VOUT ranges. Its dual-reference FBX pin (1.6V for positive outputs, –0.8V for negative) selects error amplifier A1 or A2, eliminating external topology-specific components.
It features integrated frequency foldback during low-VOUT conditions and soft-start controlled by VC-node ramping, preventing inductor saturation and output overshoot. The 2MHz oscillator enables compact 0.68–10µH inductors, while INTVCC's 3V LDO powers internal circuitry with mandatory 1µF bypass.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 25V - supports wide-input industrial and automotive supplies without pre-regulation |
| IQ in Burst Mode | 6µA - enables multi-year battery life in always-on sensor nodes and portable diagnostics |
| Switch Rating | 2A, 28V - handles peak loads up to 2A while blocking up to 28V, suitable for 12V boost and –12V inverting rails |
| Switching Frequency | Fixed 2MHz (±10%) - allows use of sub-1µH inductors and reduces EMI filter size |
| FBX Reference | +1.60V or –0.80V - single-pin configuration for boost/SEPIC (+) or inverting (–) topologies |
| UVLO Threshold | Rising: 1.68V, Falling: 1.60V (80mV hysteresis) - enables precise system-level brown-out protection |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
Pinout & Package
LT8335IDDB#PBF uses an 8-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (Pin 9 = GND). The package height is 0.75mm, enabling ultra-thin portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Input supply connection | Must be locally bypassed with ≥4.7µF X7R ceramic capacitor; trace inductance affects input ringing risk |
| 2: SW | Drain of internal 2A/28V MOSFET | High di/dt node; minimize trace area to reduce EMI and gate drive loop inductance |
| 3: FBX | Feedback input for output regulation | Accepts +1.6V (boost/SEPIC) or –0.8V (inverting); sets output via resistor divider; controls frequency foldback near GND |
| 4: GND | Analog and power ground reference | Pin 4 and exposed pad (Pin 9) must connect to large copper ground plane for thermal and noise performance |
| 5: NC | No internal connection | Must be tied to local ground per layout guidelines; not floating |
| 6: EN/UVLO | Enable and undervoltage lockout input | Logic-high (>1.68V) enables operation; <0.2V reduces IQ to <1µA; resistive divider programs system UVLO |
| 7: INTVCC | Internally regulated 3V supply | Requires ≥1µF low-ESR ceramic bypass to GND; no external loading permitted |
| 8: GND | Secondary ground connection | Electrically tied to Pin 4 and exposed pad; improves grounding integrity in high-current paths |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 6µA quiescent current with <15mV output ripple preserves battery energy without sacrificing regulation stability |
| Single-Pin Topology Selection | FBX pin automatically configures error amplifier (A1/A2) for boost, SEPIC, or inverting-reducing BOM count and PCB footprint |
| Integrated Soft-Start & Foldback | VC-ramped soft-start prevents inrush current; FBX-triggered frequency foldback avoids minimum-on-time violation during startup/faults |
| Thermal Lockout Protection | Halts switching at 170°C junction temperature and resumes with soft-start after 5°C cooldown-prevents thermal runaway |
| Internal Compensation | Eliminates external compensation network, simplifying design for ceramic or tantalum output capacitors |
Applications
| Portable Medical Diagnostics | Automotive Body Control Modules |
|---|---|
Use Scenario: Powering handheld ultrasound probes and glucose meters from single-cell Li-ion batteries (3.0–4.2V). IC Role / Device Role / Timing Role: LT8335IDDB#PBF acts as a 12V boost converter delivering regulated rail for analog front-end and display drivers. Use Value: 6µA IQ extends battery runtime beyond 3 years in standby; 2MHz operation minimizes inductor size for compact probe housing. |
Use Scenario: Generating isolated –5V rail for CAN transceiver bias and sensor signal conditioning in door modules. IC Role / Device Role / Timing Role: LT8335IDDB#PBF configured as inverting converter using FBX = –0.8V reference to generate stable negative voltage. Use Value: Single-chip solution replaces discrete charge-pump + LDO; –40°C to +125°C rating ensures reliability in under-dash environments. |
| Industrial IoT Sensor Nodes | Telecom Remote Radio Units |
Use Scenario: Supplying 5V/3.3V rails from 4–24V DC field bus in wireless vibration sensors with 10-year battery life targets. IC Role / Device Role / Timing Role: LT8335IDDB#PBF operates in SEPIC mode to maintain regulation during input dips below output voltage. Use Value: Wide 3–25V input range accommodates unregulated field power; UVLO programming prevents brownout resets during transient sags. |
Use Scenario: Providing auxiliary 3.3V bias for RF front-end ICs in outdoor small cells powered by 12V PoE injectors. IC Role / Device Role / Timing Role: LT8335IDDB#PBF functions as high-efficiency boost converter with 2MHz switching to minimize EMI near sensitive RF sections. Use Value: Low-ripple Burst Mode ensures clean supply for low-noise amplifiers; DFN package enables dense RF board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8330IDDB#PBF | Lower 1.2A switch current, same 2MHz frequency and FBX architecture | Suitable only for ≤1.2A output loads; lacks thermal lockout and has higher IQ (12µA) | Select when load current is <1.2A and cost sensitivity outweighs thermal safety requirements |
| TPS61088RHLR | 2.5A/20V switch, 2.5MHz, no negative output support, external compensation required | Cannot implement inverting topology; requires additional compensation components and larger solution size | Choose only for pure boost applications needing >2A output where negative rail generation is unnecessary |
Compared with LT8335IDDB#PBF, LT8330IDDB#PBF offers lower cost but reduced current capability and safety features, while TPS61088RHLR provides higher current but sacrifices topology flexibility and increases design complexity-making LT8335IDDB#PBF optimal for multi-rail, space-constrained, and thermally demanding applications.
Availability
LT8335IDDB#PBF is available at Aetrix Electronics and suitable for portable electronics, automotive body control modules, and industrial IoT sensor nodes requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8335IDDB#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LT8335IDDB#PBF belongs to the LT83xx family of ultralow-IQ DC/DC converters designed specifically for battery-critical applications where multi-year standby life, small solution size, and robust fault protection are mandatory.
FAQ
What is the maximum output current achievable with LT8335IDDB#PBF in boost configuration?
The LT8335IDDB#PBF supports up to 2A peak switch current, but practical continuous output current depends on input/output voltage ratio, inductor selection, and thermal management. At VIN = 5V, VOUT = 12V, typical continuous output is 440mA; at VIN = 6V, it reaches 520mA. Exceeding these values risks thermal shutdown due to power dissipation limits in the 3mm × 2mm DFN package.
Can LT8335IDDB#PBF generate a negative output voltage?
Yes, the LT8335IDDB#PBF can generate negative output voltages when configured as an inverting converter. This is achieved by connecting the FBX pin to a resistor divider between VOUT and GND, which pulls FBX to –0.80V-activating internal amplifier A2. The datasheet confirms –0.80V regulation accuracy over temperature and load, enabling stable –5V or –12V rails.
How does the EN/UVLO pin function on LT8335IDDB#PBF?
The EN/UVLO pin on LT8335IDDB#PBF serves dual roles: logic enable (high >1.68V) and programmable undervoltage lockout. With an internal 1.60V reference and 80mV hysteresis, it stops switching when voltage falls below 1.60V and resumes above 1.68V. At <0.2V, VIN current drops below 1µA-enabling ultra-low-power shutdown in battery systems.
Is external compensation required for LT8335IDDB#PBF?
No, the LT8335IDDB#PBF features fully internal compensation, eliminating the need for external Type-II or Type-III networks. This simplifies design for both ceramic (low-ESR) and tantalum (higher-ESR) output capacitors. Stability is maintained across topologies-boost, SEPIC, and inverting-without component changes.
What thermal considerations apply to LT8335IDDB#PBF layout?
LT8335IDDB#PBF requires soldering its exposed thermal pad (Pin 9) to a large copper ground plane, with multiple vias to inner layers. Pin 5 (GND) must also connect to the same plane. Thermal resistance θJA is 80.5°C/W; exceeding 125°C junction temperature derates lifetime, and thermal lockout activates at 170°C. Layout must prioritize heat spreading-not just conduction-to avoid localized hot spots.
LT8335IDDB#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Bulk
- 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)
LT8335IDDB#PBF FAQ
1.How can I place an order for LT8335IDDB#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8335IDDB#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 LT8335IDDB#PBF reliable?
The price and inventory of LT8335IDDB#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8335IDDB#PBF is usually 5 days.
3.What payment methods are accepted for LT8335IDDB#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8335IDDB#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8335IDDB#PBF?
LT8335IDDB#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8335IDDB#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 LT8335IDDB#PBF?
For technical support, including LT8335IDDB#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8335IDDB#PBF requirements.
6.How does Aetrix verify that LT8335IDDB#PBF is sourced from the original manufacturer or authorized distributors?
All LT8335IDDB#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 LT8335IDDB#PBF meets industry standards.
7.What is the process for return or replacement of LT8335IDDB#PBF?
All LT8335IDDB#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8335IDDB#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 LT8335IDDB#PBF part is unused and in its original packaging.
Return procedure for LT8335IDDB#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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