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Analog Devices Inc. LT3483AIDC#TRPBF
- Part No.:
- LT3483AIDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3483AIDC#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 340MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,668
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Product details
Overview
LT3483AIDC#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 switch, optimized for space-constrained portable bias applications including OLED and LCD displays.
For engineers reviewing the LT3483AIDC#TRPBF datasheet, LT3483AIDC#TRPBF pinout, LT3483AIDC#TRPBF application, or LT3483AIDC#TRPBF equivalent, key selection criteria include output voltage range (–38V max), shutdown current (<1µA), thermal performance in DFN-8 (θJA = 88.5°C/W), and compatibility with low-profile inductors (e.g., 10µH) for minimal footprint designs.
Technical Context
The LT3483AIDC#TRPBF employs a constant off-time (COT) control architecture with internal 300ns off-time delay and hysteresis-based FB comparator (10mV trip hysteresis) to maintain regulation across wide load ranges. Its internal 400mA/40V power switch and integrated Schottky diode eliminate external rectification needs in inverting charge pump topologies.
Operation relies on precise 10µA feedback current sourcing from the FB pin-enabling single-resistor output programming (R1 = –VOUT / 10µA)-and proprietary short-circuit protection that limits switch current without external sensing. The device supports both inverting flyback and inverting charge pump configurations, with D-pin current limit of 350mA and SW leakage <1µA at 40V.
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 pre-regulation. |
| Output Voltage Range | Up to –38V - enables high-voltage bias for OLED anodes and LCD VCOM without transformers. |
| Switch Current Limit | 400mA - higher than LT3483 (200mA), allowing greater output current or improved short-circuit robustness. |
| Quiescent Current | 40µA active / <1µA shutdown - extends battery life in always-on portable systems like handheld medical devices. |
| Switch Off-Time | 300ns - permits use of small inductors (e.g., 4.7µH–10µH) and ceramic capacitors for sub-40mm² solution size. |
| FB Feedback Current | –10µA (sourced) - enables single-resistor programming with negligible loading error on high-value R1 networks. |
| Thermal Resistance | θJA = 88.5°C/W (DFN-8) - requires exposed pad soldered to PCB ground plane for full 125°C operation. |
Pinout & Package
LT3483AIDC#TRPBF is housed in an 8-lead 2mm × 2mm × 0.75mm plastic DFN package with exposed thermal pad (Pin 9, GND). The package supports reflow soldering per JEDEC J-STD-020 and requires controlled thermal relief for the exposed pad to achieve rated θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback Input | Sinks precisely trimmed 10µA; connects to resistor divider from VOUT to set output voltage via R1 = –VOUT / 10µA. |
| GND (Pins 2 & 3) | Ground Reference | Pins 2 and 3 must be tied together and connected to low-impedance PCB ground plane; exposed pad (Pin 9) is also GND and mandatory for thermal performance. |
| SW (Pin 1) | Switch Node | Drives external inductor; carries high di/dt switching current-requires short, low-inductance trace routing to minimize EMI. |
| VIN (Pin 6) | Input Supply | Accepts 2.5V–16V; requires ≥1µF local ceramic bypass capacitor placed adjacent to pin. |
| D (Pin 5) | Diode Anode | Connects to cathode of external Schottky (charge pump) or flying capacitor (flyback); internal 40V Schottky handles reverse recovery. |
| SHDN (Pin 4) | Shutdown Control | Logic-level input: <0.4V = shutdown (<1µA IQ), >1.5V = active; no pull-up required. |
| NC (Pin 7) | No Connection | Not internally bonded-must remain unconnected and un-routed on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V Schottky Diode | Eliminates external diode, reducing BOM count and board area while enabling –38V output without transformer isolation. |
| One-Resistor Feedback | Uses internal 10µA current source to set VOUT with single resistor-removes feedback divider error and simplifies layout. |
| 300ns Fixed Off-Time Control | Enables stable operation with tiny inductors (4.7µH–10µH) and ceramic capacitors, achieving <40mm² total solution size. |
| Output Short-Circuit Protection | Proprietary current limiting prevents damage during sustained output shorts-even at 16V VIN-without external sensing. |
| Low Shutdown Current | <1µA shutdown IQ allows integration into always-on backup rails (e.g., RTC, SRAM) without measurable battery drain. |
Applications
| OLED Display Bias | LCD VCOM Driver |
|---|---|
Use Scenario: Generating –15V to –30V bias for OLED display anode drive in smartwatches and AR glasses. IC Role / Device Role / Timing Role: Inverting charge pump DC/DC converter providing regulated negative rail with low ripple and fast transient response. Use Value: Enables high-contrast OLED imaging using only one external inductor and two ceramics-reducing solution size by >50% vs. transformer-based alternatives. | Use Scenario: Supplying precision –5V to –10V VCOM voltage for automotive-grade TFT-LCD panels. IC Role / Device Role / Timing Role: Micropower inverting regulator maintaining tight output tolerance (±1.5%) over temperature and load variation. Use Value: Achieves <10mV output ripple with 5pF FB capacitor and 4.7µF X5R ceramic output cap-critical for flicker-free display operation. |
| Handheld Medical Instrumentation | Digital Camera CCD Bias |
Use Scenario: Powering analog front-end op-amps requiring dual ±5V rails from a single 3.6V Li+ cell. IC Role / Device Role / Timing Role: Primary negative rail generator in compact, battery-operated diagnostic tools with strict power budget constraints. Use Value: 40µA quiescent current extends usable battery life beyond 12 months in intermittent-use devices like portable pulse oximeters. | Use Scenario: Providing –12V to –22V bias for CCD image sensor substrate depletion in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency inverting flyback converter supporting fast frame rates with minimal thermal rise. Use Value: 400mA switch current limit ensures reliable startup and regulation under cold-start conditions down to –40°C ambient. |
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; larger footprint but eliminates second converter IC. | Select when system requires both +VOUT and –VOUT from same input-LT3483AIDC#TRPBF is preferred for dedicated negative rail only. |
| LT1931AIS5#TRPBF | 1A switch, 2.2MHz switching, TSOT-23-5 package, 5.8mA quiescent current. | Better suited for higher-current, higher-frequency designs where efficiency >85% at 100mA is critical. | Choose when output current exceeds 50mA and board space allows TSOT-23; LT3483AIDC#TRPBF excels in ultra-low-IQ, space-constrained roles. |
Compared with LT3463EDD#PBF and LT1931AIS5#TRPBF, the LT3483AIDC#TRPBF delivers superior micropower performance (40µA IQ vs. 5.8mA or 40µA with lower switch current), smaller DFN-8 footprint (4mm² vs. 6.2mm² or 2.5mm²), and simpler one-resistor feedback-making it optimal for cost-sensitive, battery-limited portable bias applications.
Availability
LT3483AIDC#TRPBF is available at Aetrix Electronics and suitable for OLED display bias, LCD VCOM driver, and handheld medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3483AIDC#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 acquired Linear Technology in 2017 and maintains its legacy high-performance analog and power management portfolio with rigorous reliability testing and automotive-grade qualification paths.
The LT3483A series belongs to Linear's micropower inverting DC/DC converter product line, designed specifically for space- and power-constrained portable electronics needing compact, transformerless negative voltage generation.
FAQ
What is the maximum output voltage achievable with the LT3483AIDC#TRPBF?
The LT3483AIDC#TRPBF supports regulated negative outputs 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 datasheet, and applies across the full –40°C to 125°C operating temperature range for the 'I' grade device. Output voltage is set solely by the feedback resistor value using R1 = –VOUT / 10µA.
Does the LT3483AIDC#TRPBF require an external Schottky diode?
No, the LT3483AIDC#TRPBF integrates a 40V Schottky diode internally-no external diode is needed in standard inverting charge pump or flyback configurations. The D pin connects directly to the cathode of the internal diode, and the datasheet explicitly states "Internal 40V Schottky Diode" under FEATURES. External diodes are only used in optional configurations (e.g., replacing the internal diode for higher voltage or current handling).
How does the LT3483AIDC#TRPBF differ from the standard LT3483 version?
The LT3483AIDC#TRPBF features a higher switch current limit (400mA vs. 200mA for LT3483), identical 300ns off-time, same 10µA FB current, and shares the same DFN-8 package and –40°C to 125°C temperature rating. Electrical Characteristics tables confirm the LT3483A has doubled current limit across all test conditions, enabling higher output power or improved short-circuit margin without changing layout or external components.
What is the recommended input bypass capacitor for the LT3483AIDC#TRPBF?
A 4.7µF X5R or X7R ceramic capacitor is recommended for the VIN pin when the power source is more than a few inches away (e.g., remote battery); otherwise, a minimum 1µF ceramic capacitor is sufficient. This requirement is specified in the Applications Information section and validated in all Typical Application circuits (e.g., TA01a, TA02a, TA04a), where 4.7µF is consistently used with Li+-based inputs to suppress input ripple and support peak switch current demands.
Can the LT3483AIDC#TRPBF operate from a 2.5V input supply?
Yes, the LT3483AIDC#TRPBF is fully specified to operate from 2.5V to 16V input, as stated in the Electrical Characteristics table under "VIN Operating Range". This enables direct use with single-cell NiMH (1.2V×2=2.4V), LiFePO₄ (3.2V), or low-voltage logic rails. Startup behavior at 2.5V is verified in Typical Performance Characteristics, and the device maintains regulation down to this minimum with no derating.
LT3483AIDC#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3483AIDC#TRPBF FAQ
1.How can I place an order for LT3483AIDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3483AIDC#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 LT3483AIDC#TRPBF reliable?
The price and inventory of LT3483AIDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3483AIDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3483AIDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3483AIDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3483AIDC#TRPBF?
LT3483AIDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3483AIDC#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 LT3483AIDC#TRPBF?
For technical support, including LT3483AIDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3483AIDC#TRPBF requirements.
6.How does Aetrix verify that LT3483AIDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3483AIDC#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 LT3483AIDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3483AIDC#TRPBF?
All LT3483AIDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3483AIDC#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 LT3483AIDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3483AIDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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