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Analog Devices Inc. LT3483AEDC#TRMPBF
- Part No.:
- LT3483AEDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3483AEDC#TRMPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 340MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:939
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Product details
Overview
LT3483AEDC#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower inverting DC/DC converter with integrated 40V Schottky diode and one-resistor feedback, delivering regulated negative outputs up to –38V from 2.5V–16V input. It features 40µA quiescent current, 300ns fixed off-time control, and a 400mA internal power switch in an 8-lead 2mm × 2mm DFN package. Used in OLED bias, handheld computers, and LCD bias circuits.
For engineers reviewing the LT3483AEDC#TRMPBF datasheet, LT3483AEDC#TRMPBF pinout, LT3483AEDC#TRMPBF application, or LT3483AEDC#TRMPBF equivalent, key selection criteria include output voltage range (–38V max), shutdown current (<1µA), switch current limit (400mA), thermal performance (θJA = 88.5°C/W), and compatibility with low-profile inductors and ceramic capacitors in space-constrained portable designs.
Technical Context
The LT3483AEDC#TRMPBF employs a constant off-time control architecture with internal 10µA feedback current reference, enabling precise one-resistor output programming (R1 = –VOUT/10µA). Its 300ns minimum off-time supports high-frequency operation with small passive components.
It integrates a 40V/400mA NPN power switch and on-chip Schottky diode, eliminating external rectification. Output short-circuit protection is implemented via proprietary current limiting that remains functional even at 16V input during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 16V - supports single-cell Li+ to multi-cell battery inputs without external regulators. |
| Output Voltage Range | Up to –38V - enables high-voltage bias for OLED and LCD panels without transformers. |
| Switch Current Limit | 400mA - higher than LT3483 (200mA), allowing greater output current in charge-pump or flyback topologies. |
| Quiescent Current | 40µA active / <1µA shutdown - extends battery life in always-on portable systems. |
| Switch VCE(SAT) | 200mV at 150mA - minimizes conduction loss and improves efficiency at medium loads. |
| Fixed Off-Time | 300ns - enables use of sub-10µH inductors and reduces footprint in compact layouts. |
| Feedback Current | 10µA (trimmed) - eliminates loading error and simplifies resistor-based output setting. |
Pinout & Package
LT3483AEDC#TRMPBF is housed in an 8-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed GND pad (Pin 9) for thermal management. Pin 6 is NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback input | Connects to single resistor R1; sets output via IFB = 10µA sink - enables accurate, load-independent regulation. |
| GND (Pins 2 & 3) | Ground reference | Pins 2 and 3 both tied to PCB ground plane; exposed pad (Pin 9) must be soldered to GND for θJA = 88.5°C/W. |
| SW (Pin 1) | Switch node | Drives external inductor L1; carries high dI/dt - requires minimized trace length and solid ground return. |
| VIN (Pin 6) | Input supply | Accepts 2.5V–16V; requires ≥1µF local ceramic bypass capacitor near pin. |
| D (Pin 5) | Diode anode | Internal Schottky anode; connects to flying capacitor (charge pump) or coupled inductor (flyback). |
| SHDN (Pin 4) | Shutdown control | Active-high logic: >1.5V enables, <0.4V disables; draws only 6–10µA when active. |
| NC (Pin 6) | No connection | Not bonded internally - must be left unconnected or tied to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V Schottky diode | Eliminates external diode, reduces BOM count and board area in inverting charge-pump configurations. |
| One-resistor feedback | Uses internal 10µA current source - removes need for resistor divider, avoids output loading error and improves regulation accuracy. |
| Output short-circuit protection | Proprietary current limiting sustains safe operation at full input voltage (16V) during output faults - no external current-sense circuitry required. |
| Low 300ns off-time | Enables use of 4.7µH–10µH low-profile inductors and 0.1µF–4.7µF ceramic capacitors - ideal for ultra-thin portable devices. |
| Thermally enhanced DFN | Exposed GND pad delivers θJA = 88.5°C/W - supports continuous operation at 25mA load in 40mm² solution size without heatsinking. |
Applications
| LCD Bias | OLED Bias |
|---|---|
Use Scenario: Generating stable –10V to –22V bias for TFT-LCD gate drivers and source drivers in handheld tablets. IC Role / Device Role / Timing Role: Primary inverting DC/DC regulator providing negative rail; operates in constant off-time mode with 300ns timing resolution. Use Value: Enables compact 40mm² solution using 10µH inductor and 4.7µF ceramic output cap - meets EMI and thickness constraints of consumer displays. | Use Scenario: Supplying programmable –5V to –38V cathode bias for AMOLED pixel circuits in smartwatches and foldables. IC Role / Device Role / Timing Role: High-voltage inverting converter with 400mA switch - delivers fast transient response needed for dynamic display content. Use Value: 40µA quiescent current preserves battery runtime during screen-off periods; integrated Schottky avoids reverse recovery losses. |
| Battery Backup | Handheld Computers |
Use Scenario: Maintaining –5V or –8V SRAM retention voltage during main power loss in industrial data loggers. IC Role / Device Role / Timing Role: Always-on micropower inverter - activated by SHDN pin during brown-out events. Use Value: <1µA shutdown current ensures multi-year backup from coin cell; wide 2.5V–16V input accommodates aging battery profiles. | Use Scenario: Powering analog front-end ICs requiring negative rails in ruggedized PDAs and barcode scanners. IC Role / Device Role / Timing Role: Primary negative supply generator - interfaces directly with low-ESR ceramic caps and miniature inductors. Use Value: 8-lead DFN package (2mm × 2mm) fits within tight mechanical envelopes; robust 125°C junction rating supports extended field operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3463EDD#PBF | Dual-output (boost + inverter); 250mA switch; integrated Schottkys; DFN-10 package. | Supports simultaneous positive and negative rails - suitable where system requires ±VOUT from single input. | Choose LT3463EDD#PBF if dual-rail generation is needed; LT3483AEDC#TRMPBF is preferred for single-rail, higher-current (400mA) negative-only applications. |
| LT1931ES5#TRMPBF | 1A switch; 2.2MHz switching; 5.8mA quiescent current; TSOT-23-5 package. | Higher switching frequency allows smaller inductors but consumes more idle power - better for high-load, low-size applications than ultra-low-power ones. | Choose LT1931ES5#TRMPBF when >100mA output current and minimal inductor size are critical; LT3483AEDC#TRMPBF excels in micropower (<40µA) and high-voltage (–38V) scenarios. |
Compared with LT3463EDD#PBF and LT1931ES5#TRMPBF, the LT3483AEDC#TRMPBF offers the lowest quiescent current (40µA) and highest negative output capability (–38V) in the smallest footprint (2mm × 2mm), making it optimal for battery-sensitive, high-voltage portable biasing where only a single negative rail is required.
Availability
LT3483AEDC#TRMPBF is available at Aetrix Electronics and suitable for OLED bias, LCD bias, and battery backup systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3483AEDC#TRMPBF 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 precision analog and power management portfolio with rigorous reliability testing and automotive-grade qualification pathways.
The LT3483AEDC#TRMPBF belongs to Linear's micropower inverting DC/DC converter family, designed specifically for space- and power-constrained portable electronics needing high-voltage negative rails without transformers or external diodes.
FAQ
What is the maximum negative output voltage achievable with the LT3483AEDC#TRMPBF?
The LT3483AEDC#TRMPBF supports regulated negative outputs up to –38V, enabled by its 40V internal power switch and integrated Schottky diode. This capability is confirmed in the Absolute Maximum Ratings (D pin = –40V) and Applications section, and is achievable in inverting charge-pump topology with appropriate external components - no transformer required.
How does the LT3483AEDC#TRMPBF differ from the standard LT3483 version?
The LT3483AEDC#TRMPBF features a higher switch current limit (400mA vs. 200mA for LT3483), enabling greater output current in both charge-pump and flyback configurations. Electrical Characteristics tables explicitly list separate min/typ/max values for LT3483 and LT3483A across switch current limit, and the Order Information table confirms distinct part markings (LFXD for LT3483A vs. LCYT for LT3483).
Can the LT3483AEDC#TRMPBF operate from a single 3.6V Li+ battery?
Yes - the LT3483AEDC#TRMPBF operates from 2.5V to 16V input, fully covering the 3.0V–4.2V discharge curve of a single Li+ cell. Typical applications shown in the datasheet (e.g., 3.6V to –8V and 3.6V to –22V converters) validate reliable startup and regulation across this range, including under light-load and shutdown conditions.
What is the purpose of the NC pin (Pin 6) on the LT3483AEDC#TRMPBF DFN package?
Pin 6 on the LT3483AEDC#TRMPBF is designated NC (No Connection) per the Pin Functions section and Package Description - it is not internally bonded and serves no electrical function. The datasheet recommends leaving it unconnected; however, grounding it is acceptable per standard DFN layout practice to improve mechanical stability and reduce floating node risk.
Does the LT3483AEDC#TRMPBF require an external compensation network?
No - the LT3483AEDC#TRMPBF uses a constant off-time control scheme with internal compensation and does not require external compensation components. The one-resistor feedback architecture (R1 = –VOUT/10µA) and fixed 300ns off-time eliminate loop stability concerns associated with traditional voltage-mode controllers, simplifying design and reducing component count.
LT3483AEDC#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Buck, Boost, Charge Pump, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- -2.5V
- Voltage - Output (Max):
- -38V
- Current - Output:
- 340mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3483AEDC#TRMPBF FAQ
1.How can I place an order for LT3483AEDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3483AEDC#TRMPBF 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 LT3483AEDC#TRMPBF reliable?
The price and inventory of LT3483AEDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3483AEDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3483AEDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3483AEDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3483AEDC#TRMPBF?
LT3483AEDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3483AEDC#TRMPBF 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 LT3483AEDC#TRMPBF?
For technical support, including LT3483AEDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3483AEDC#TRMPBF requirements.
6.How does Aetrix verify that LT3483AEDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3483AEDC#TRMPBF 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 LT3483AEDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3483AEDC#TRMPBF?
All LT3483AEDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3483AEDC#TRMPBF, 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 LT3483AEDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT3483AEDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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