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Analog Devices Inc. LT3483EDC#PBF
- Part No.:
- LT3483EDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3483EDC#PBF.pdf
- Description:
- IC REG INV ADJ 0.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,543
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Product details
Overview
LT3483EDC#PBF 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 generation for portable displays.
For engineers reviewing the LT3483EDC#PBF datasheet, LT3483EDC#PBF pinout, LT3483EDC#PBF application, or LT3483EDC#PBF equivalent, key selection criteria include its 200mV VCE(SAT) at 150mA, –40°C to +85°C operating range, integrated Schottky, and compatibility with low-profile inductors for space-constrained battery-powered systems.
Technical Context
The LT3483EDC#PBF employs a constant off-time (COT) control architecture with internal 300ns off-time delay and hysteresis-based FB comparator (10mV trip hysteresis). Its 200mA current-limited NPN switch operates with 200mV saturation voltage at 150mA, enabling high efficiency across light-to-moderate loads.
Feedback uses a precision 10µA sink current referenced to GND, allowing single-resistor output programming (R1 = –VOUT/10µA). The device supports both inverting charge pump and inverting flyback topologies, with D-pin configured as Schottky anode and SW-pin driving external inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single-cell Li+ up to multi-cell battery inputs without external regulators. |
| Output Voltage Range | Up to –38V - enables high-voltage negative bias for OLED, LCD, and CCD applications without transformers. |
| Quiescent Current | 40µA active / <1µA shutdown - extends battery life in always-on portable instrumentation and backup systems. |
| Switch Current Limit | 200mA - limits peak inductor current to protect internal transistor during startup or short-circuit events. |
| Switch VCE(SAT) | 200mV at 150mA - minimizes conduction loss and thermal rise in compact DFN package. |
| FB Reference Current | 10µA sink - enables precise, resistor-only output setting with negligible loading error on VOUT. |
| Off-Time | 300ns - permits use of small-value inductors (e.g., 4.7µH–10µH) and ceramic capacitors for minimal PCB footprint. |
Pinout & Package
LT3483EDC#PBF is housed in an 8-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed pad (Pin 9) tied to GND for thermal management. Pin 6 is NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback Input | Sinks 10µA reference current; connects to output via R1 to set VOUT = –10µA × R1. |
| GND (Pins 2 & 3) | Ground Reference | Dual ground pins reduce impedance; exposed pad must be soldered to PCB ground plane for θJA = 88.5°C/W. |
| SW (Pin 1) | Switch Node | Drives external inductor L1; carries high di/dt switching current - requires short, low-inductance routing. |
| VIN (Pin 6) | Input Supply | Accepts 2.5V–16V; requires ≥1µF local ceramic bypass capacitor near pin. |
| D (Pin 5) | Schottky Anode | Internal 40V Schottky diode anode; connects to flying capacitor cathode in charge pump or inductor in flyback. |
| SHDN (Pin 4) | Shutdown Control | Active-high logic input; <0.4V disables device (<1µA IQ), >1.5V enables operation. |
| 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 while supporting –38V output capability. |
| One-Resistor Feedback | Uses internal 10µA sink to set output voltage precisely without divider network errors or loading effects. |
| Low 300ns Off-Time | Enables use of sub-10µH inductors and 0.22µF–4.7µF ceramic output capacitors for ultra-compact designs. |
| Output Short-Circuit Protection | Proprietary current limiting prevents damage during sustained output shorts, even at 16V input. |
| Thermally Enhanced DFN | Exposed pad and dual GND pins achieve 88.5°C/W junction-to-ambient thermal resistance for reliable 200mA operation. |
Applications
| LCD Bias Generation | OLED Display Power |
|---|---|
Use Scenario: Generating stable –10V to –22V bias rails for TFT-LCD gate drivers and source drivers in handheld computers and industrial HMIs. IC Role / Device Role / Timing Role: Inverting DC/DC controller providing regulated negative supply with low ripple and fast transient response. Use Value: Enables single-supply battery operation without external transformers; 40µA IQ preserves battery runtime during display standby. | Use Scenario: Supplying programmable negative bias (–5V to –15V) for OLED pixel anode/cathode control in smartwatches and AR glasses. IC Role / Device Role / Timing Role: Micropower inverting converter operating in discontinuous conduction mode to minimize EMI in RF-sensitive wearable systems. Use Value: 300ns off-time and 2mm × 2mm DFN allow integration into <5mm² PCB area; integrated Schottky avoids diode placement errors. |
| Battery Backup Systems | Digital Camera CCD Bias |
Use Scenario: Providing –3V to –8V auxiliary supply for real-time clocks and SRAM retention during main power failure in IoT edge nodes. IC Role / Device Role / Timing Role: Always-on inverter with <1µA shutdown current, activated only when primary rail drops below UVLO threshold. Use Value: 2.5V minimum VIN allows operation directly from depleted Li+ cells; no external enable circuitry required. | Use Scenario: Generating –12V to –20V bias for CCD image sensor substrate depletion in compact digital cameras and medical endoscopes. IC Role / Device Role / Timing Role: High-voltage inverting regulator supporting fast polarity reversal and low-noise output for analog signal integrity. Use Value: 40V switch rating and –38V max output eliminate need for discrete high-voltage transistors or transformer-based 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 |
|---|---|---|---|
| LT3483ES6#PBF | Same core IC but in 6-lead TSOT-23 package; no exposed thermal pad; higher θJA (192°C/W); identical electrical specs. | Preferred for ultra-thin assemblies where 0.75mm DFN height is unacceptable; lower thermal capacity limits continuous 200mA use. | Select LT3483ES6#PBF only when board thickness constraints override thermal performance requirements. |
| LT1617ES5#PBF | Lower IQ (20µA), wider VIN (1.2V–15V), same –34V max output; uses external Schottky; different pinout and control scheme. | Better for ultra-low-power coin-cell applications; requires external diode and feedback divider; not drop-in compatible. | Choose LT1617ES5#PBF when sub-20µA quiescent current is mandatory and board space allows external components. |
Compared with LT3483EDC#PBF, the LT3483ES6#PBF offers identical functionality in a thinner but thermally limited package, while the LT1617ES5#PBF trades integration for lower IQ and broader input range - neither is pin-compatible, requiring layout revision and recalibration of feedback and magnetics.
Availability
LT3483EDC#PBF is available at Aetrix Electronics and suitable for OLED bias generation, LCD panel power, and battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LT3483EDC#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 full technical and manufacturing continuity for legacy Linear power products.
The LT3483 series belongs to Linear's micropower inverting DC/DC converter product line, designed specifically for space- and power-constrained portable electronics requiring high-voltage negative rails without transformers.
FAQ
What is the maximum output voltage achievable with the LT3483EDC#PBF?
The LT3483EDC#PBF 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 transistors or transformer-based topologies in applications such as OLED and LCD bias generation. Output voltage is set by a single feedback resistor using the formula R1 = –VOUT/10µA.
Does the LT3483EDC#PBF require an external Schottky diode?
No, the LT3483EDC#PBF integrates a 40V Schottky diode with anode accessible at the D pin. This eliminates the need for an external diode in standard inverting charge pump or flyback configurations, reducing component count, board area, and potential layout errors. The internal diode supports up to 350mA peak current and exhibits 0.64V forward drop at 150mA.
What is the purpose of the NC pin on the LT3483EDC#PBF DFN package?
Pin 6 on the LT3483EDC#PBF is marked NC (No Connection) and is not internally bonded. It must remain unconnected in the PCB layout. While some designs tie NC pins to GND for mechanical stability, Linear's datasheet specifies no internal connection - grounding it provides no functional benefit and may risk unintended coupling in high-frequency switching paths near the SW and D pins.
How does the LT3483EDC#PBF achieve low quiescent current in shutdown mode?
The LT3483EDC#PBF draws less than 1µA in shutdown mode when the SHDN pin is pulled below 0.4V. Internal circuitry - including the reference, comparators, and driver - is fully disabled, leaving only leakage paths active. This ultra-low shutdown current makes the LT3483EDC#PBF ideal for battery-backed systems where months of standby time are required without significant self-discharge.
Can the LT3483EDC#PBF be used in inverting flyback topology?
Yes, the LT3483EDC#PBF supports inverting flyback configuration using a coupled inductor. In this mode, the D pin connects to the secondary winding, and the SW pin drives the primary. The device's 200mA switch current limit and 40V rating accommodate typical flyback designs generating –5V to –15V outputs. Layout must minimize SW/D node loop area, and a 0.47µF capacitor between SW and D is recommended to suppress ringing.
LT3483EDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3483EDC#PBF FAQ
1.How can I place an order for LT3483EDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3483EDC#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 LT3483EDC#PBF reliable?
The price and inventory of LT3483EDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3483EDC#PBF is usually 5 days.
3.What payment methods are accepted for LT3483EDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3483EDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3483EDC#PBF?
LT3483EDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3483EDC#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 LT3483EDC#PBF?
For technical support, including LT3483EDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3483EDC#PBF requirements.
6.How does Aetrix verify that LT3483EDC#PBF is sourced from the original manufacturer or authorized distributors?
All LT3483EDC#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 LT3483EDC#PBF meets industry standards.
7.What is the process for return or replacement of LT3483EDC#PBF?
All LT3483EDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3483EDC#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 LT3483EDC#PBF part is unused and in its original packaging.
Return procedure for LT3483EDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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