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Analog Devices Inc. LT3483AEDC#TRPBF
- Part No.:
- LT3483AEDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3483AEDC#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 340MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,499
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Product details
Overview
LT3483AEDC#TRPBF 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. It is used in OLED bias generation for portable displays.
For engineers reviewing the LT3483AEDC#TRPBF datasheet, LT3483AEDC#TRPBF pinout, LT3483AEDC#TRPBF application, or LT3483AEDC#TRPBF 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 designs.
Technical Context
The LT3483AEDC#TRPBF employs a constant off-time (COT) control architecture with precise 10µA feedback current reference, enabling single-resistor output programming and eliminating feedback loading. Its internal 40V/400mA NPN switch and integrated Schottky diode support high-efficiency inverting charge pump and flyback topologies.
Operation relies on FB pin hysteresis (10mV) and comparator-driven latch control: when FB falls below ~0V, the switch activates for a fixed 300ns off-time, ramping inductor current until reaching the 400mA current limit, after which energy transfers via the integrated Schottky to charge the flying capacitor and regulate VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single-cell Li+ (3.0–4.2V), dual-cell alkaline, and industrial 12V rails without external regulators. |
| Output Voltage Range | Up to –38V - enables high-voltage OLED and LCD bias without transformers or external diodes. |
| Switch Current Limit | 400mA - higher than LT3483 (200mA), allowing greater output current or improved short-circuit robustness in flyback configurations. |
| Quiescent Current | 40µA active / <1µA shutdown - extends battery life in always-on portable systems like handheld medical devices. |
| Fixed Off-Time | 300ns - permits use of sub-10µH inductors (e.g., 4.7µH) and low-ESR ceramic capacitors, minimizing PCB area to ~40mm². |
| Feedback Reference | 10µA sink - enables precise output setting with one resistor (RFB = –VOUT/10µA), removing need for divider networks or op-amp compensation. |
| Thermal Resistance | θJA = 88.5°C/W - requires exposed pad soldered to PCB ground plane to sustain 25mA continuous load at 85°C ambient. |
Pinout & Package
LT3483AEDC#TRPBF is housed in an 8-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed thermal pad (Pin 9, GND). The package supports reflow-compatible assembly and achieves θJA = 88.5°C/W when the exposed pad is properly soldered to a PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback Input | Sinks precisely trimmed 10µA; connects to output via single resistor to set VOUT = –10µA × RFB. |
| GND (Pins 2 & 3) | Ground Reference | Pins 2 and 3 must be tied together and connected to system ground; exposed pad (Pin 9) is also GND and critical for thermal performance. |
| SW (Pin 1) | Switch Node | Connects to inductor L1A and flying capacitor; carries high dv/dt switching waveform - trace length must be minimized. |
| VIN (Pin 6) | Input Supply | Accepts 2.5V–16V; requires ≥1µF local ceramic bypass (4.7µF recommended if >2" from source). |
| D (Pin 5) | Diode Anode | Internal Schottky anode; connects to flying capacitor cathode and inductor L1B (flyback) or external diode (charge pump). |
| SHDN (Pin 4) | Shutdown Control | Active-high logic input; <0.4V disables device (<1µA IQ); >1.5V enables operation. |
| NC (Pin 7) | No Connection | Not internally bonded - must remain unconnected and unstubbed on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V Schottky Diode | Eliminates external diode, reduces BOM count and footprint, and avoids reverse recovery losses in high-frequency operation. |
| One-Resistor Feedback | Uses internal 10µA current sink to set output voltage - simplifies layout, removes divider ratio errors, and improves regulation accuracy over temperature. |
| 300ns Fixed Off-Time Control | Enables stable operation across wide load range without loop compensation; supports ultra-small inductors (4.7µH) and fast transient response. |
| Output Short-Circuit Protection | Proprietary current limiting prevents damage during sustained output shorts, even at 16V input - no external foldback circuitry required. |
| Low 200mV VCE(SAT) | Reduces conduction loss at 150mA, improving efficiency in medium-load conditions typical of display bias applications. |
Applications
| LCD Bias Generation | OLED Display Power |
|---|---|
Use Scenario: Generating –15V to –22V bias for TFT-LCD gate drivers in handheld computers and industrial HMIs. IC Role / Device Role / Timing Role: Inverting flyback DC/DC controller providing regulated negative rail with tight line/load regulation and low ripple. Use Value: Enables compact, transformerless bias solution with <1% output drift over 2.5V–6V input range and 0–10mA load variation. | Use Scenario: Supplying –8V to –12V cathode bias for AMOLED panels in smartphones and wearables. IC Role / Device Role / Timing Role: Micropower inverting charge pump regulator operating in discontinuous conduction mode for ultra-low standby current. Use Value: Achieves 40µA quiescent current and <1µA shutdown, extending battery runtime in always-on display modes without compromising startup time. |
| Battery Backup Systems | Digital Camera CCD/OLED Bias |
Use Scenario: Providing –5V auxiliary rail for real-time clock (RTC) and SRAM backup during main power failure in industrial controllers. IC Role / Device Role / Timing Role: Low-noise, high-reliability inverting converter with output short-circuit protection and thermal shutdown. Use Value: Delivers stable –5V at 1mA with <20mV ripple using 0.22µF ceramic output capacitor - eliminates need for linear post-regulation. | Use Scenario: Generating –10V to –30V bias for CCD sensor substrates or OLED anode/cathode separation in compact digital cameras. IC Role / Device Role / Timing Role: High-voltage inverting DC/DC controller supporting up to –38V output with integrated 40V switch and Schottky. Use Value: Replaces discrete boost-inverter stages, reducing component count by 7 parts and PCB area by >60% versus discrete solutions. |
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 |
|---|---|---|---|
| LT3483EDC#TRPBF | Same package and pinout; lower 200mA switch current limit and 200mV VCE(SAT); identical 40µA IQ and 300ns off-time. | Rated for ≤15mA loads at –22V; unsuitable for >20mA OLED bias or high-current flyback designs. | Select LT3483EDC#TRPBF only when output current demand is ≤15mA and cost sensitivity outweighs headroom requirements. |
| LT3463EDE#TRPBF | Dual-output (boost + inverter); 250mA switch; integrated Schottkys; DFN-10 package; 40µA IQ; supports ±40V outputs. | Provides simultaneous positive and negative rails; larger footprint (3mm × 3mm); higher complexity for single-rail needs. | Choose LT3463EDE#TRPBF only when dual-rail (e.g., ±12V) generation is required - not a drop-in replacement for single inverting function. |
Compared with LT3483EDC#TRPBF, the LT3483AEDC#TRPBF offers double the switch current (400mA vs 200mA) for higher output capability and better short-circuit margin, while maintaining identical quiescent current, package, and feedback architecture; versus LT3463EDE#TRPBF, it trades dual-rail flexibility for smaller size, lower cost, and simpler design in single-negative-rail applications.
Availability
LT3483AEDC#TRPBF is available at Aetrix Electronics and suitable for OLED display bias, LCD panel power, and battery-backed memory systems requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for LT3483AEDC#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3483/LT3483A product line was designed specifically for space-constrained, battery-powered applications needing efficient, transformerless negative voltage generation - targeting portable displays, imaging sensors, and low-power instrumentation.
FAQ
What is the maximum output voltage achievable with the LT3483AEDC#TRPBF?
The LT3483AEDC#TRPBF supports regulated negative output voltages up to –38V, enabled by its internal 40V-rated power switch and integrated Schottky diode. This capability is confirmed in the Absolute Maximum Ratings and Typical Applications sections of the official datasheet, and applies across the full –40°C to 85°C operating temperature range for the E-grade part.
Does the LT3483AEDC#TRPBF require external compensation components?
No, the LT3483AEDC#TRPBF does not require external compensation components. Its constant off-time control architecture and precisely trimmed 10µA feedback current reference eliminate the need for loop compensation networks. Output voltage is set with a single resistor from FB to VOUT, and stability is inherent across load and input voltage variations per the datasheet's application circuits and performance curves.
How does the LT3483AEDC#TRPBF differ from the standard LT3483EDC#TRPBF?
The LT3483AEDC#TRPBF features a higher 400mA switch current limit (vs 200mA in LT3483EDC#TRPBF), identical 40µA quiescent current, same 8-lead DFN package and pinout, and shares all electrical specifications except switch rating. This makes the LT3483AEDC#TRPBF suitable for higher-output-current applications such as –22V at 8mA or –8V at 25mA, where the base LT3483 may approach current limit.
Can the LT3483AEDC#TRPBF be used in inverting charge pump and flyback topologies?
Yes, the LT3483AEDC#TRPBF supports both inverting charge pump and inverting flyback topologies. The datasheet provides distinct application schematics, component recommendations, and performance data for each: charge pump for |VOUT| > VIN (e.g., 3.6V → –22V), and flyback for |VOUT| ≤ VIN (e.g., 3.6V → –5V). Pin connections and external component values differ between configurations per the Applications Information section.
What is the role of the NC pin (Pin 7) on the LT3483AEDC#TRPBF?
The NC pin (Pin 7) on the LT3483AEDC#TRPBF is not internally connected and must remain unconnected on the PCB. It is not a no-connect by oversight but a deliberate design choice to maintain pin compatibility with other variants in the family. Routing traces to or placing copper near Pin 7 is discouraged, as it may introduce parasitic coupling or violate the recommended layout guidelines in the datasheet.
LT3483AEDC#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3483AEDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3483AEDC#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 LT3483AEDC#TRPBF reliable?
The price and inventory of LT3483AEDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3483AEDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3483AEDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3483AEDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3483AEDC#TRPBF?
LT3483AEDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3483AEDC#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 LT3483AEDC#TRPBF?
For technical support, including LT3483AEDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3483AEDC#TRPBF requirements.
6.How does Aetrix verify that LT3483AEDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3483AEDC#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 LT3483AEDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3483AEDC#TRPBF?
All LT3483AEDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3483AEDC#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 LT3483AEDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3483AEDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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