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Analog Devices Inc. LT3483AIDC#TRMPBF
- Part No.:
- LT3483AIDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3483AIDC#TRMPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 340MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
LT3483AIDC#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. It is used in OLED bias generation for portable displays.
For engineers reviewing the LT3483AIDC#TRMPBF datasheet, LT3483AIDC#TRMPBF pinout, LT3483AIDC#TRMPBF application, or LT3483AIDC#TRMPBF equivalent, key selection criteria include output voltage range (–38V max), shutdown current (<1µA), thermal performance (θJA = 88.5°C/W), and compatibility with low-profile inductors and ceramic capacitors in space-constrained designs.
Technical Context
The LT3483AIDC#TRMPBF employs a constant off-time (COT) control scheme with internal 300ns off-time delay and hysteresis-based FB comparator (10mV trip hysteresis) to regulate output voltage via single resistor feedback (R1 = –VOUT / 10µA). Its architecture integrates a 40V/400mA NPN switch and on-chip Schottky diode, enabling inverting charge pump or flyback topologies without external diodes.
It supports two primary configurations: inverting charge pump (for |VOUT| > VIN, e.g., 3.6V → –22V) and inverting flyback (for |VOUT| ≤ VIN, e.g., 2.5V–6V → –5V), both leveraging internal current limiting (400mA typical), short-circuit protection, and low VCESAT (200mV at 150mA) to maintain efficiency across load currents from 0.1mA to 25mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single-cell Li+ (3.6V), dual-cell alkaline (3V), 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. |
| Quiescent Current | 40µA active / <1µA shutdown - extends battery life in always-on portable instrumentation and backup systems. |
| Switch Current Limit | 400mA (typ) - provides robust short-circuit tolerance while allowing use of compact 4.7µH–10µH inductors. |
| Switch Off-Time | 300ns (fixed) - permits high-frequency operation with small passive components, minimizing footprint to ~40mm². |
| Feedback Current | 10µA (precisely trimmed) - eliminates loading error and enables accurate one-resistor output programming (R1 = –VOUT / 10µA). |
| Thermal Resistance | θJA = 88.5°C/W - requires exposed pad soldered to PCB ground plane for full 125°C junction rating. |
Pinout & Package
LT3483AIDC#TRMPBF is housed in an 8-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed thermal pad (Pin 9, GND). The package supports reflow soldering and requires PCB ground plane connection to the exposed pad for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback Input | Connects to output via single resistor R1; 10µA sink current sets VOUT = –10µA × R1; 10mV hysteresis enables stable hysteretic regulation. |
| GND (Pins 2 & 3) | Ground Reference | Pins 2 and 3 are internally tied to GND; both must be connected to PCB ground plane for signal integrity and thermal conduction. |
| SW (Pin 1) | Switch Node | Drives external inductor L1; carries high di/dt switching current; requires minimal trace length and tight loop area with D and CFLY. |
| VIN (Pin 6) | Input Supply | Accepts 2.5V–16V; requires ≥1µF local ceramic bypass (4.7µF recommended if >2" from source) to suppress input ripple. |
| D (Pin 5) | Diode Anode | Internal Schottky anode; connects to cathode of external diode (flyback) or flying capacitor (charge pump); rated –40V reverse. |
| SHDN (Pin 4) | Shutdown Control | Logic-level enable: <0.4V = shutdown (<1µA IQ), >1.5V = active; 6–10µA input bias allows direct MCU GPIO drive. |
| NC (Pin 7) | No Connection | Not bonded; must be left unconnected or grounded per layout best practice (no electrical function). |
| Exposed Pad (Pin 9) | Thermal/Ground Plane | Internally connected to GND; must be soldered to large PCB copper area for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V Schottky Diode | Eliminates external diode, reduces BOM count and board area, and improves reliability in portable OLED/LCD bias supplies. |
| One-Resistor Feedback Architecture | Uses precisely trimmed 10µA FB current to set output voltage (R1 = –VOUT / 10µA), removing feedback divider errors and loading effects. |
| 300ns Fixed Off-Time Control | Enables high-frequency switching (>1MHz) with tiny inductors (4.7µH–10µH) and ceramics (0.22µF–4.7µF), achieving solution size as small as 40mm². |
| 400mA Internal Switch with 200mV VCESAT | Delivers high peak current into load transients while minimizing conduction loss and thermal rise in space-constrained DFN package. |
| Output Short-Circuit Protection | Proprietary current-limiting and latch-off behavior prevents damage during sustained output shorts, even at 16V VIN. |
Applications
| OLED Display Bias | LCD Panel Voltage Generation |
|---|---|
Use Scenario: Generating –15V to –22V bias for organic LED pixel drivers in handheld medical monitors and wearables. IC Role / Device Role / Timing Role: Inverting charge pump DC/DC converter providing regulated negative rail with <30mV ripple using 0.22µF–4.7µF ceramic output caps. Use Value: Enables ultra-thin display modules by eliminating transformers and discrete diodes while maintaining >65% efficiency at 8–25mA loads. | Use Scenario: Supplying –5V to –8V gate drive and common electrode voltages for segment-based automotive LCD dashboards. IC Role / Device Role / Timing Role: Inverting flyback regulator using coupled inductor (SDQ12 or LPD3015) to generate stable negative rail from 5V or 12V vehicle supply. Use Value: Achieves <1µA shutdown current and 88.5°C/W thermal resistance, supporting extended temperature operation (–40°C to 125°C) without derating. |
| Portable Digital Camera Backlight | Battery Backup Power Conversion |
Use Scenario: Driving white LED strings requiring –12V bias in compact point-and-shoot cameras powered by single Li+ cell. IC Role / Device Role / Timing Role: Micropower inverting converter operating in discontinuous conduction mode with 40µA quiescent current and 300ns off-time. Use Value: Extends standby time between shots by reducing no-load power draw to <0.1µW and enabling fast wake-up from shutdown. | Use Scenario: Providing –3.3V or –5V auxiliary rail for real-time clock (RTC) and SRAM retention during main system power loss. IC Role / Device Role / Timing Role: Low-IQ inverting regulator accepting wide-input (2.5V–16V) from backup supercapacitor or coin cell to sustain critical logic. Use Value: Maintains regulation down to 2.5V input and draws only 40µA active current, maximizing backup runtime in industrial data loggers. |
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, 40µA IQ. | Supports simultaneous positive and negative rails; larger footprint; higher complexity for single-rail needs. | Choose LT3463EDD#PBF only when dual-rail generation is required; LT3483AIDC#TRMPBF offers smaller size and simpler design for dedicated negative bias. |
| LT1931ES5#TRMPBF | 1A switch, 1.2MHz/2.2MHz switching, 5.8mA IQ, TSOT-23-5 package, no integrated Schottky. | Higher output current capability but requires external diode; less suitable for ultra-low-power portable bias. | Choose LT1931ES5#TRMPBF for higher-current applications (>50mA); LT3483AIDC#TRMPBF is preferred for micropower (<25mA), transformerless designs. |
Compared with LT3463EDD#PBF and LT1931ES5#TRMPBF, the LT3483AIDC#TRMPBF delivers optimal trade-off of ultra-low quiescent current (40µA), integrated Schottky, and minimal 40mm² solution size-making it uniquely suited for space- and power-constrained negative bias generation where single-rail simplicity is critical.
Availability
LT3483AIDC#TRMPBF is available at Aetrix Electronics and suitable for OLED bias, LCD panel voltage generation, and battery backup power conversion requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LT3483AIDC#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LT3483A series belongs to Linear's micropower DC/DC converter product line, designed specifically for space-constrained, battery-operated applications requiring high-efficiency negative voltage generation without transformers or external diodes.
FAQ
What is the maximum negative output voltage achievable with the LT3483AIDC#TRMPBF?
The LT3483AIDC#TRMPBF supports regulated negative output voltages up to –38V, enabled by its 40V internal switch and integrated Schottky diode. This capability is realized in inverting charge pump configuration with appropriate inductor and capacitor selection, and is validated across the full –40°C to 125°C operating temperature range for the LT3483AIDC#TRMPBF variant.
How does the LT3483AIDC#TRMPBF achieve regulation with only one external resistor?
The LT3483AIDC#TRMPBF uses a precisely trimmed 10µA internal current sink at the FB pin, so output voltage is set by R1 = –VOUT / 10µA. This one-resistor method eliminates feedback divider errors and loading effects. The FB comparator has 10mV hysteresis, enabling stable hysteretic control without external compensation components in the LT3483AIDC#TRMPBF design.
Can the LT3483AIDC#TRMPBF operate from a 2.5V input supply?
Yes, the LT3483AIDC#TRMPBF operates over an input voltage range of 2.5V to 16V, including 2.5V. At 2.5V input, it maintains regulation for outputs such as –5V (in flyback mode) or –8V (in charge pump mode), with verified performance down to the minimum VIN specification. Undervoltage lockout activates below 2.0V to prevent unstable operation.
What is the thermal performance of the LT3483AIDC#TRMPBF in its DFN package?
The LT3483AIDC#TRMPBF in the 8-lead 2mm × 2mm DFN package has θJA = 88.5°C/W when the exposed pad (Pin 9) is properly soldered to a PCB ground plane. This allows continuous operation at full load up to 125°C junction temperature. Thermal derating begins above 85°C ambient unless additional copper area or airflow is provided.
Is the LT3483AIDC#TRMPBF pin-compatible with the standard LT3483IDC#TRMPBF?
Yes, the LT3483AIDC#TRMPBF is pin-compatible with the LT3483IDC#TRMPBF - both use identical 8-lead DFN (2mm × 2mm) packages and share the same pinout, electrical interface, and footprint. The key difference is the higher 400mA switch current limit (vs. 200mA) and tighter FB current tolerance in the 'A' version, making LT3483AIDC#TRMPBF a direct performance upgrade without layout changes.
LT3483AIDC#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3483AIDC#TRMPBF FAQ
1.How can I place an order for LT3483AIDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3483AIDC#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 LT3483AIDC#TRMPBF reliable?
The price and inventory of LT3483AIDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3483AIDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3483AIDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3483AIDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3483AIDC#TRMPBF?
LT3483AIDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3483AIDC#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 LT3483AIDC#TRMPBF?
For technical support, including LT3483AIDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3483AIDC#TRMPBF requirements.
6.How does Aetrix verify that LT3483AIDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3483AIDC#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 LT3483AIDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3483AIDC#TRMPBF?
All LT3483AIDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3483AIDC#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 LT3483AIDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT3483AIDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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