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Analog Devices Inc. LT3483IDC#TRPBF
- Part No.:
- LT3483IDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3483IDC#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 170MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,437
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Product details
Overview
LT3483IDC#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 200mA internal power switch in an 8-lead 2mm × 2mm DFN package. Used in OLED bias generation for portable displays.
For engineers reviewing the LT3483IDC#TRPBF datasheet, LT3483IDC#TRPBF pinout, LT3483IDC#TRPBF application, or LT3483IDC#TRPBF equivalent, key selection criteria include its –40°C to 125°C operating temperature range, 200mV VCE(SAT) at 150mA, shutdown current <1µA, and compatibility with low-profile 10µH inductors and ceramic flying/output capacitors in space-constrained designs.
Technical Context
The LT3483IDC#TRPBF employs a constant off-time (COT) control architecture with internal 300ns off-time delay and hysteresis-based FB comparator (10mV trip hysteresis), enabling high efficiency across load currents from 0.1mA to 25mA. Its integrated 40V/200mA NPN switch and on-chip Schottky diode eliminate external rectification in inverting charge pump topologies.
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 (for |VOUT| > VIN) and inverting flyback (for |VOUT| ≤ VIN) configurations, with short-circuit protection limiting peak switch current to 230mA.
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 (2.5–3.2V), and industrial 12V rails without external regulation. |
| Output Voltage Range | Up to –38V - enables high-voltage OLED and LCD bias without transformers or external high-voltage diodes. |
| Quiescent Current | 40µA active / <1µA shutdown - extends battery life in always-on portable instrumentation and backup systems. |
| Switch Current Limit | 200mA (typ), 230mA (max) - sets maximum deliverable output current and provides inherent short-circuit protection. |
| Switch VCE(SAT) | 200mV at 150mA - minimizes conduction loss and thermal rise in compact DFN package. |
| FB Reference Current | 10µA (sourced from output) - enables precise, low-loading one-resistor feedback with negligible error contribution. |
| Off-Time | 300ns (fixed) - permits use of small 10µH inductors and reduces switching node ringing in high-density layouts. |
Pinout & Package
LT3483IDC#TRPBF is housed in an 8-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed thermal pad (Pin 9, GND). The package supports high-power density PCB layouts and requires soldering the exposed pad to a solid ground plane for thermal performance (θJA = 88.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback Input | Sinks precisely trimmed 10µA current; connects to output via single resistor R1 to set VOUT = –10µA × R1. |
| GND (Pins 2 & 3) | Ground Reference | Two dedicated ground pins reduce ground impedance; exposed pad (Pin 9) must be connected to PCB ground plane. |
| SW (Pin 1) | Switch Node | Connects to inductor L1 and flying capacitor; carries high dv/dt switching waveform - minimize trace length. |
| VIN (Pin 6) | Input Supply | Accepts 2.5V–16V; requires ≥1µF local ceramic bypass capacitor near pin. |
| D (Pin 5) | Diode Anode | Internal Schottky anode; connects to flying capacitor cathode and inductor L2 in flyback, or external diode in charge pump. |
| SHDN (Pin 4) | Shutdown Control | Active-high logic input; drives <10µA; pulls to GND to disable regulator and reduce IQ to <1µA. |
| NC (Pin 7) | No Connection | Not internally bonded - leave unconnected or tie to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V Schottky Diode | Eliminates external diode, reducing BOM count and board area in inverting charge pump designs. |
| One-Resistor Feedback Architecture | Uses internal 10µA current source to set output voltage - simplifies design and avoids resistor-divider loading errors. |
| 300ns Fixed Off-Time Control | Enables stable operation with tiny 10µH inductors and low-ESR ceramic capacitors, minimizing footprint to ~40mm². |
| Output Short-Circuit Protection | Proprietary current-limiting limits peak switch current to 230mA even under sustained output shorts at 16V input. |
| Low 0.1µA Shutdown Current | Extends shelf life and standby time in battery-backed memory, real-time clocks, and sensor nodes. |
Applications
| OLED Display Bias | LCD Panel Gate Driver Supply |
|---|---|
Use Scenario: Generating –15V to –22V bias for OLED pixel anode/cathode control 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 compact, transformerless high-voltage bias using only one inductor and two ceramic capacitors - critical for sub-10mm-thick wearable form factors. | Use Scenario: Supplying –10V gate-off voltage for TFT-LCD source/gate drivers in handheld tablets and medical monitors. IC Role / Device Role / Timing Role: Micropower inverting regulator delivering stable negative rail during display idle and active modes. Use Value: 40µA quiescent current preserves battery runtime during screen-off periods; 200mV VCE(SAT) ensures minimal dropout at full load. |
| Portable Instrumentation Backup Supply | Digital Camera CCD/OIS Bias |
Use Scenario: Providing –5V auxiliary supply for SRAM retention and RTC backup during main power loss in handheld test equipment. IC Role / Device Role / Timing Role: Always-on inverting converter maintaining regulated negative rail from primary battery or supercapacitor. Use Value: <1µA shutdown current prevents measurable drain on backup energy storage over months of standby. | Use Scenario: Generating –8V to –12V bias for CCD vertical/horizontal shift registers and optical image stabilization actuators. IC Role / Device Role / Timing Role: High-efficiency inverting DC/DC converter synchronized to imaging frame timing to minimize noise coupling. Use Value: 300ns off-time and low EMI layout support clean analog signal paths - essential for low-noise image capture. |
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 |
|---|---|---|---|
| LT3483AIDC#TRPBF | Higher 400mA switch current limit, same package and pinout. | Supports higher output current (up to ~40mA at –8V) and wider input-output differentials. | Select when >25mA output current or improved short-circuit robustness is required; otherwise LT3483IDC#TRPBF offers optimal cost/performance for ≤25mA loads. |
| LT1931AEDD#TRPBF | 1A switch, 2.2MHz switching frequency, no integrated Schottky, requires external diode. | Better suited for higher-current, lower-ripple applications where board area allows external diode placement. | Choose when output current exceeds 30mA or when higher switching frequency enables smaller LC components - but adds BOM complexity and layout sensitivity. |
Compared with LT3483AIDC#TRPBF and LT1931AEDD#TRPBF, the LT3483IDC#TRPBF delivers the best balance of ultra-low quiescent current (40µA), integrated Schottky diode, and compact 2mm × 2mm DFN footprint for space- and power-constrained portable bias applications requiring up to 25mA.
Availability
LT3483IDC#TRPBF is available at Aetrix Electronics and suitable for OLED bias, LCD panel supply, and portable instrumentation backup requiring stable component supply across extended temperature ranges.
Supply support for LT3483IDC#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT3483 series.
The LT3483 family was designed specifically for micropower inverting DC/DC conversion in portable and battery-operated systems, emphasizing minimal solution size, ultra-low IQ, and integration of critical power train components.
FAQ
What is the maximum output voltage achievable with the LT3483IDC#TRPBF?
The LT3483IDC#TRPBF supports regulated negative outputs up to –38V, enabled by its 40V internal switch rating and integrated Schottky diode. This capability eliminates the need for external high-voltage transformers or discrete diodes in applications such as OLED display bias and high-voltage sensor interfaces. Output voltage is set by a single feedback resistor (R1 = –VOUT/10µA), and stability is maintained across the full –40°C to 125°C operating range of the LT3483IDC#TRPBF.
Does the LT3483IDC#TRPBF require an external Schottky diode?
No, the LT3483IDC#TRPBF integrates a 40V Schottky diode internally, eliminating the need for an external diode in standard inverting charge pump and flyback configurations. This integration reduces bill-of-materials count, PCB area, and layout complexity. The D pin serves as the anode terminal of the internal diode and connects directly to the flying capacitor or external inductor, depending on topology. The LT3483IDC#TRPBF datasheet confirms this feature in both the Features list and Block Diagram.
What is the recommended inductor value for a 3.6V to –8V application using the LT3483IDC#TRPBF?
For a 3.6V to –8V inverting charge pump application, the LT3483IDC#TRPBF datasheet recommends a 10µH inductor - such as Murata LQH2MCN100K02L - based on optimal trade-offs between output current capability, voltage ripple, and physical size. Smaller values (4.7µH or 6.8µH) are suggested only for input/output voltages below 7V. The 10µH value ensures stable operation at 25mA load while maintaining low profile and compatibility with the LT3483IDC#TRPBF's 300ns off-time control scheme.
How does the LT3483IDC#TRPBF achieve its 40µA quiescent current?
The LT3483IDC#TRPBF achieves 40µA quiescent current through a combination of optimized internal biasing, hysteresis-based feedback comparator activation (only enabling circuitry when FB voltage rises above 10mV), and low-leakage process technology. During light-load conditions, the device enters burst-mode-like operation where the internal switch remains off until output capacitor discharge lowers FB voltage sufficiently to trigger a switching cycle. This behavior is confirmed in the Electrical Characteristics table and Typical Performance plots for quiescent current vs. temperature in the LT3483IDC#TRPBF datasheet.
Can the LT3483IDC#TRPBF be used in an inverting flyback configuration?
Yes, the LT3483IDC#TRPBF supports inverting flyback topology using a coupled inductor, as documented in the Applications Information section and Typical Application TA03. In this configuration, it delivers up to –5V at 8mA from 2.5V–6V input, with efficiency peaking near 70%. The flyback mode is preferred when |VOUT| ≤ VIN, whereas the charge pump is optimal for |VOUT| > VIN. Both topologies are fully supported by the LT3483IDC#TRPBF's pinout, internal switch, and control architecture.
LT3483IDC#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:
- 170mA (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)
LT3483IDC#TRPBF FAQ
1.How can I place an order for LT3483IDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3483IDC#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 LT3483IDC#TRPBF reliable?
The price and inventory of LT3483IDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3483IDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3483IDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3483IDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3483IDC#TRPBF?
LT3483IDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3483IDC#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 LT3483IDC#TRPBF?
For technical support, including LT3483IDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3483IDC#TRPBF requirements.
6.How does Aetrix verify that LT3483IDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3483IDC#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 LT3483IDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3483IDC#TRPBF?
All LT3483IDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3483IDC#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 LT3483IDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3483IDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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