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Analog Devices Inc. LT3483EDC
- Part No.:
- LT3483EDC
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3483EDC.pdf
- Description:
- IC REG BUCK BOOST ADJ 170MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,154
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Product details
Overview
LT3483EDC 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 200mA switch current limit in an 8-lead 2mm × 2mm DFN package. Used in OLED bias, handheld computers, and digital camera power rails.
For engineers reviewing the LT3483EDC datasheet, LT3483EDC pinout, LT3483EDC application, or LT3483EDC equivalent, key selection criteria include its 200mV VCE(SAT) at 150mA, –40°C to +85°C operating range, integrated Schottky anode terminal (D pin), and precise 10µA feedback current enabling single-resistor output programming.
Technical Context
The LT3483EDC employs a constant off-time, current-limited switching architecture with internal 40V/200mA NPN power switch and integrated Schottky diode anode (D pin). Its feedback comparator trips at 0V with 10mV hysteresis and draws precisely trimmed –10µA, enabling direct R1 = –VOUT/10µA output setting without loading error.
Operation relies on external inductor and flying capacitor in either inverting charge pump (for |VOUT| > VIN) or inverting flyback (for |VOUT| ≤ VIN) topologies. Shutdown reduces quiescent current to <1µA, and short-circuit protection limits peak switch current 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 and industrial rails. |
| Output Voltage Range | Up to –38V - enables high-voltage negative bias for OLED, LCD, and CCD without transformers. |
| Switch Current Limit | 200mA - sets maximum deliverable load current and defines inductor sizing for stable operation. |
| Quiescent Current | 40µA active / <1µA shutdown - extends battery life in portable devices with low standby drain. |
| Feedback Current | –10µA (trimmed) - allows single-resistor output programming with negligible loading error on VOUT. |
| Switch Off-Time | 300ns - enables use of small, low-profile inductors (e.g., 10µH) and ceramic capacitors for compact layouts. |
| VCE(SAT) | 200mV at 150mA - minimizes conduction loss and improves efficiency at medium loads. |
Pinout & Package
LT3483EDC is housed in an 8-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed thermal pad (Pin 9, GND). The package supports high-density PCB layouts and requires soldering the exposed pad to PCB ground for rated thermal performance (θJA = 88.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback input | Connects to output via single resistor; draws –10µA to set VOUT = –10µA × R1. |
| GND (Pins 2 & 3) | Ground reference | Both pins must be tied to system ground; Pin 2 is primary GND, Pin 3 shared with FB node. |
| SW (Pin 1) | Switch collector | Drives external inductor; carries high dI/dt; requires short, low-inductance routing. |
| VIN (Pin 6) | Input supply | Accepts 2.5V–16V; requires ≥1µF local ceramic bypass capacitance. |
| D (Pin 5) | Schottky anode terminal | Internal Schottky anode; connects to flying capacitor and inductor in charge pump or flyback topology. |
| SHDN (Pin 4) | Shutdown control | Logic-high (≥1.5V) enables operation; logic-low (≤0.4V) disables switch and reduces IQ to <1µA. |
| NC (Pin 7) | No internal connection | Not bonded; must be left unconnected or grounded per layout best practice. |
| Exposed Pad (Pin 9) | Thermal & electrical GND | Must be soldered to PCB ground plane to achieve specified θJA and prevent thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V Schottky diode anode | Eliminates external diode, reducing BOM count and board area in inverting topologies. |
| One-resistor feedback network | Uses precise –10µA internal current source to set output voltage without divider loading error. |
| Fixed 300ns off-time control | Enables predictable frequency scaling with load and input voltage, simplifying EMI filtering. |
| Output short-circuit protection | Proprietary current limiting prevents damage during sustained output faults, even at 16V input. |
| Low 200mV VCE(SAT) | Reduces conduction loss at 150mA, improving efficiency in medium-current portable applications. |
Applications
| LCD Bias | OLED Bias |
|---|---|
Use Scenario: Generating –10V to –22V bias for segment drivers in monochrome or color STN/TFT LCD panels. IC Role / Device Role / Timing Role: Inverting DC/DC converter providing regulated negative rail from 3.3V or 5V system supply. Use Value: Enables compact, transformerless bias generation with <65% efficiency at 8mA load and <30mV ripple using 0.22µF output capacitor. | Use Scenario: Supplying –8V to –15V cathode bias for passive-matrix or active-matrix OLED displays. IC Role / Device Role / Timing Role: Micropower inverting regulator delivering stable negative voltage with ultra-low quiescent current. Use Value: Extends battery runtime in handheld devices via 40µA no-load IQ and efficient operation down to 2.5V input. |
| Digital Camera Power | Handheld Computer Core Logic |
Use Scenario: Providing –5V or –8V for CCD sensor bias, flash memory interface, or analog front-end circuitry. IC Role / Device Role / Timing Role: Compact inverting converter supporting fast transient response and short-circuit robustness. Use Value: Delivers up to –38V output with integrated 40V switch and Schottky, eliminating need for discrete high-voltage components. | Use Scenario: Generating –3.3V or –5V auxiliary rails for level-shifting, RS-232 transceivers, or analog subsystems. IC Role / Device Role / Timing Role: Low-noise, space-constrained inverter powering isolated logic domains from main battery. Use Value: Achieves 40mm² total solution size using 2mm × 2mm DFN, 10µH inductor, and 0.22µF ceramic output capacitor. |
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 |
|---|---|---|---|
| LT3483AEDC | Higher 400mA switch current limit, same package and pinout. | Supports higher output current (e.g., >25mA at –8V) without redesigning magnetics or layout. | Select when load exceeds 200mA or higher short-circuit robustness is required. |
| LT1617ES6 | 6-lead TSOT-23 package, 350mA ISW, 20µA IQ, 1.2V–15V VIN. | Lower minimum input voltage enables single alkaline or NiMH cell operation. | Choose for ultra-low-VIN systems where LT3483EDC's 2.5V minimum is insufficient. |
Compared with LT3483AEDC, the LT3483EDC offers lower cost and sufficient current for sub-20mA bias rails; versus LT1617ES6, it provides higher output voltage capability (–38V vs –34V) and integrated Schottky but requires higher minimum input voltage.
Availability
LT3483EDC is available at Aetrix Electronics and suitable for LCD bias, OLED bias, and digital camera power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3483EDC 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 full technical and manufacturing continuity for legacy Linear power products.
The LT3483EDC belongs to Linear's micropower inverting DC/DC converter family, designed specifically for space-constrained portable electronics needing high-voltage negative rails without transformers or external diodes.
FAQ
What is the maximum negative output voltage achievable with the LT3483EDC?
The LT3483EDC supports regulated negative outputs up to –38V, enabled by its internal 40V-rated power switch and integrated Schottky diode. This capability eliminates the need for external high-voltage components or transformers in applications such as OLED and LCD panel bias. The actual achievable output depends on input voltage, inductor selection, and load current, but –38V remains the absolute upper limit specified in the Absolute Maximum Ratings table.
Can the LT3483EDC operate from a single 3.6V Li+ battery?
Yes, the LT3483EDC operates from 2.5V to 16V input, making it fully compatible with standard 3.6V Li+ batteries across their discharge curve (3.0V–4.2V). At 3.6V input, typical applications like the 3.6V-to–8V converter achieve >65% efficiency at 25mA load, with quiescent current held to 40µA to maximize battery life in standby mode.
How is the output voltage set on the LT3483EDC?
The LT3483EDC uses a single feedback resistor (R1) connected between the output and the FB pin to set VOUT, per the formula R1 = –VOUT / 10µA. For example, a –8V output requires R1 = 800kΩ. This one-resistor method is made possible by the device's precisely trimmed –10µA internal feedback current source, which avoids loading errors common with resistive dividers.
Does the LT3483EDC require an external Schottky diode?
No, the LT3483EDC integrates the Schottky diode anode (D pin); only the cathode must be connected externally-either to the flying capacitor (charge pump) or to a coupled inductor (flyback). This integration reduces component count, PCB area, and cost compared to controllers requiring discrete diodes, while maintaining 0.64V forward drop at 150mA.
What package type and thermal considerations apply to the LT3483EDC?
The LT3483EDC is supplied in an 8-lead 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 9, GND). To achieve the specified θJA of 88.5°C/W, the exposed pad must be soldered to a PCB ground plane with adequate copper area. Thermal performance degrades significantly if the pad is left unconnected or improperly soldered, potentially triggering thermal shutdown under sustained load.
LT3483EDC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 170mA (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)
LT3483EDC FAQ
1.How can I place an order for LT3483EDC through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3483EDC 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 LT3483EDC reliable?
The price and inventory of LT3483EDC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3483EDC is usually 5 days.
3.What payment methods are accepted for LT3483EDC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3483EDC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3483EDC?
LT3483EDC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3483EDC 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 LT3483EDC?
For technical support, including LT3483EDC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3483EDC requirements.
6.How does Aetrix verify that LT3483EDC is sourced from the original manufacturer or authorized distributors?
All LT3483EDC 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 LT3483EDC meets industry standards.
7.What is the process for return or replacement of LT3483EDC?
All LT3483EDC units undergo pre-shipment inspection (PSI). If there is an issue with LT3483EDC, 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 LT3483EDC part is unused and in its original packaging.
Return procedure for LT3483EDC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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