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Analog Devices Inc. LT8335EDDB#PBF
- Part No.:
- LT8335EDDB#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8335EDDB#PBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,133
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Product details
Overview
LT8335EDDB#PBF from Analog Devices (formerly Linear Technology) is a current-mode DC/DC converter IC configured as a boost, SEPIC, or inverting regulator with a 2A/28V internal power switch, 6µA quiescent current, fixed 2MHz switching frequency, and single-feedback-pin polarity selection-used in portable medical diagnostics and low-power industrial sensors requiring stable negative or positive rail generation from 3V–25V input.
For engineers reviewing the LT8335EDDB#PBF datasheet, LT8335EDDB#PBF pinout, LT8335EDDB#PBF application, or LT8335EDDB#PBF equivalent, key selection criteria include ultralow IQ operation, programmable UVLO via EN/UVLO pin, internal compensation, soft-start/frequency foldback for startup robustness, and DFN-8 (3mm × 2mm) thermal performance with exposed GND pad.
Technical Context
The LT8335EDDB#PBF employs fixed-frequency current-mode control with dual error amplifiers-one active for positive output (FBX = +1.60V reference), the other for negative output (FBX = –0.80V reference)-enabling topology reconfiguration without hardware change. Its 2MHz oscillator, minimum on-time (115ns typ) and off-time (65ns typ), and integrated frequency foldback during low-VOUT conditions ensure stable regulation across wide VIN/VOUT ranges.
Internal 3V INTVCC LDO powers gate drivers and analog circuitry; EN/UVLO pin provides 1.60V rising threshold (80mV hysteresis) for precise system-level undervoltage lockout; FBX pin serves as unified feedback node with ±4V absolute max rating and ±10nA bias current, supporting both resistive divider configurations per output polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3V to 25V - supports single-cell Li-ion up to 24V industrial rails without external pre-regulation |
| IQ (Sleep Mode) | 6µA typical - enables >1-year battery life in always-on sensor nodes drawing <10µA average load |
| Switch Rating | 2A, 28V - handles peak inductor currents up to 2.5A (min limit) while sustaining 28V drain-source blocking |
| fSW | 2MHz fixed - allows use of sub-1µH inductors (e.g., 0.68µH–2.2µH), reducing solution size by >40% vs 500kHz converters |
| FBX Reference | +1.60V or –0.80V - single pin selects output polarity; eliminates need for external op-amps or dual-reference ICs |
| UVLO Threshold | 1.60V (rising), 1.60V ±40mV (falling) - enables accurate input brownout protection with resistor-divider programming |
| Package | 8-Lead DFN (3mm × 2mm, 0.75mm height) - exposes thermal pad (Pin 9) soldered to PCB ground for θJA = 80.5°C/W |
Pinout & Package
LT8335EDDB#PBF uses an 8-lead plastic DFN package (3mm × 2mm, 0.75mm profile) with exposed GND pad (Pin 9) requiring solder connection to PCB ground plane for thermal and electrical integrity. Pin 5 is also GND and must be tied to the same ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 3V–25V; requires local 4.7µF ceramic bypass placed adjacent to pin to minimize high-frequency noise injection |
| SW | Drain of internal N-channel MOSFET | High dv/dt node; trace length must be minimized to reduce EMI and parasitic ringing |
| FBX | Feedback input for output regulation | Configures polarity: +1.60V ref for boost/SEPIC, –0.80V ref for inverting; bias current <±10nA enables high-value dividers for low IQ |
| GND | Power and signal ground reference | Pins 5 and 9 (exposed pad) must connect to solid ground plane; insufficient grounding causes thermal runaway or instability |
| EN/UVLO | Enable and undervoltage lockout control | Logic-high (>1.68V) enables operation; <0.2V reduces VIN current to <1µA; resistor divider sets system-level UVLO point |
| INTVCC | Internally regulated 3V supply | Must be bypassed with ≥1µF low-ESR ceramic to GND; no external loading permitted-failure causes gate drive collapse |
| NC | No internal connection | Must be tied to local GND to prevent floating node coupling noise into sensitive analog sections |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 6µA sleep current with <15mV output ripple-enables multi-year operation from coin cells in remote IoT endpoints |
| Topology Flexibility | Single FBX pin supports boost (positive VOUT), SEPIC (VIN > VOUT or VIN < VOUT), and inverting (negative VOUT) without component changes |
| Startup Robustness | Integrated soft-start and frequency foldback prevent inductor saturation and VC node overshoot during cold start or fault recovery |
| Thermal Protection | Thermal lockout at 170°C (typ) with 5°C hysteresis-resets soft-start on cooldown, avoiding latch-up in enclosed enclosures |
| Internal Compensation | Eliminates external compensation network-reduces BOM count and layout sensitivity while maintaining stability with ceramic or tantalum output caps |
Applications
| Portable Medical Sensors | Industrial Process Transmitters |
|---|---|
Use Scenario: Battery-powered handheld ultrasound probe generating ±5V rails from single 3.7V Li-ion cell for analog front-end and ADC biasing. IC Role / Device Role / Timing Role: LT8335EDDB#PBF operates in inverting mode to produce –5V and boost mode for +5V, using shared FBX and SW pins to minimize footprint. Use Value: 6µA IQ extends battery life beyond 18 months; 2MHz switching enables compact 1.5mm-height inductor placement under display module. | Use Scenario: 4–20mA loop-powered temperature transmitter operating from 12–24V supply with isolated analog sensing circuitry requiring ±12V rails. IC Role / Device Role / Timing Role: LT8335EDDB#PBF configured as SEPIC to maintain regulation during input dips to 12V while delivering stable ±12V outputs. Use Value: Programmable UVLO prevents erratic behavior during brownouts; internal compensation ensures immunity to capacitor aging in harsh factory environments. |
| Automotive Cabin Monitoring | Low-Power Telecom Interface |
Use Scenario: Occupant detection system using capacitive sensing ICs requiring clean ±3.3V supplies from vehicle's 9–16V battery rail. IC Role / Device Role / Timing Role: LT8335EDDB#PBF in boost configuration generates +3.3V; inverting path creates –3.3V-all from one IC with shared feedback network. Use Value: 28V switch rating tolerates load-dump transients up to 25V; DFN package withstands automotive thermal cycling (–40°C to +125°C junction). | Use Scenario: Optical line terminal (OLT) management microcontroller needing isolated +5V and –5V for RS-485 transceiver bias in space-constrained pluggable module. IC Role / Device Role / Timing Role: LT8335EDDB#PBF replaces discrete charge-pump + LDO combo, delivering regulated rails with lower noise and higher PSRR than switched-capacitor solutions. Use Value: Low ripple Burst Mode maintains <15mV p-p noise-critical for jitter-sensitive clock distribution; 3mm × 2mm DFN fits within 8mm² board area budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17552ATP+T | 4.5V–42V input, 2.5A switch, 100µA IQ, requires external compensation | Better suited for high-input-voltage industrial power supplies; lacks ultralow IQ and polarity-flexible FBX | Select when input exceeds 25V or when higher output current (>2A) is required; not drop-in due to different pinout and compensation scheme |
| TPS61088RHLR | 2.7V–12V input, 4.8A switch, 300µA IQ, fixed +1.22V FB reference only | Optimized for single-output boost in portable electronics; no inverting/SEPIC capability or negative rail support | Choose for cost-sensitive consumer applications needing >2A output but no bipolar rail generation; incompatible FB architecture prevents direct replacement |
Compared with MAX17552ATP+T and TPS61088RHLR, the LT8335EDDB#PBF uniquely delivers sub-10µA quiescent current with topology flexibility and unified feedback-making it irreplaceable in battery-critical, space-constrained systems requiring both positive and negative regulated outputs from a single IC.
Availability
LT8335EDDB#PBF is available at Aetrix Electronics and suitable for portable medical diagnostics, industrial process transmitters, and automotive cabin monitoring systems requiring stable component supply with guaranteed long-term availability and full RoHS compliance.
Supply support for LT8335EDDB#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and conversion technologies.
The LT8335EDDB#PBF belongs to ADI's Power by Linear™ family of monolithic DC/DC converters designed specifically for ultralow-power, high-density applications where battery life, thermal constraints, and board area are critical-emphasizing IQ optimization, integrated protection, and flexible topology support.
FAQ
What is the maximum input voltage rating for LT8335EDDB#PBF?
The LT8335EDDB#PBF has an absolute maximum VIN rating of 25V. Exceeding this voltage-even momentarily-may cause permanent damage. In practice, designs should limit steady-state VIN to ≤24V with margin for transients. The internal 28V-rated switch supports output voltages up to 28V, but input must remain within 25V per Absolute Maximum Ratings table.
Can LT8335EDDB#PBF generate both positive and negative outputs simultaneously?
No-LT8335EDDB#PBF cannot generate positive and negative outputs simultaneously from a single device. It supports either boost/SEPIC (positive VOUT) or inverting (negative VOUT) configuration per design, selected by FBX divider connection. Dual-rail systems require two separate LT8335EDDB#PBF units or a different controller architecture.
What is the purpose of the NC pin on LT8335EDDB#PBF?
The NC (No Connection) pin on LT8335EDDB#PBF has no internal circuitry attached. Per datasheet guidance, it must be tied directly to local ground to prevent floating-node noise coupling into the FBX or EN/UVLO pins-especially critical in high-EMI environments like automotive or industrial settings where ungrounded pins can act as antennas.
How does LT8335EDDB#PBF achieve 6µA quiescent current?
The LT8335EDDB#PBF achieves 6µA IQ through patented low-ripple Burst Mode operation: during light loads, it delivers brief current pulses to the output capacitor, then enters deep sleep where all switching and most bias circuitry are disabled. This reduces VIN current to 6µA while maintaining regulation and keeping output ripple below 15mV-verified in typical 3V-to-12V boost applications.
Is LT8335EDDB#PBF pin-compatible with other members of the LT833x family?
No-LT8335EDDB#PBF is not pin-compatible with LT8330, LT8331, or LT8336. While sharing functional similarities, each variant has distinct pin assignments (e.g., LT8336 includes SYNC pin; LT8330 lacks EN/UVLO). The LT8335EDDB#PBF's DFN-8 layout with specific SW/FBX/EN/UVLO placement is unique to this part number and must be laid out per its dedicated footprint.
LT8335EDDB#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)
LT8335EDDB#PBF FAQ
1.How can I place an order for LT8335EDDB#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8335EDDB#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 LT8335EDDB#PBF reliable?
The price and inventory of LT8335EDDB#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8335EDDB#PBF is usually 5 days.
3.What payment methods are accepted for LT8335EDDB#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8335EDDB#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8335EDDB#PBF?
LT8335EDDB#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8335EDDB#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 LT8335EDDB#PBF?
For technical support, including LT8335EDDB#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8335EDDB#PBF requirements.
6.How does Aetrix verify that LT8335EDDB#PBF is sourced from the original manufacturer or authorized distributors?
All LT8335EDDB#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 LT8335EDDB#PBF meets industry standards.
7.What is the process for return or replacement of LT8335EDDB#PBF?
All LT8335EDDB#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8335EDDB#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 LT8335EDDB#PBF part is unused and in its original packaging.
Return procedure for LT8335EDDB#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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