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Analog Devices Inc. LT3483EDC#TRPBF
- Part No.:
- LT3483EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3483EDC#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 170MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,676
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Product details
Overview
LT3483EDC#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, handheld computers, and digital camera power rails.
For engineers reviewing the LT3483EDC#TRPBF datasheet, LT3483EDC#TRPBF pinout, LT3483EDC#TRPBF application, or LT3483EDC#TRPBF equivalent, key selection criteria include its 200mA switch current limit, –38V output capability, 40µA no-load IQ, shutdown leakage <1µA, and compatibility with low-profile 10µH inductors and ceramic flying capacitors in space-constrained portable designs.
Technical Context
The LT3483EDC#TRPBF employs a constant off-time (COT) control architecture with internal 300ns off-time delay and hysteresis-based FB comparator (10mV trip, 10mV hysteresis) to maintain regulation without external compensation. Its 200mA current-limited NPN switch operates with 200mV VCE(SAT) at 150mA, enabling high efficiency across load currents from 0.1mA to 25mA.
Feedback is implemented via precise 10µA sink current into the FB pin, allowing single-resistor output programming (R1 = –VOUT/10µA). The integrated 40V Schottky diode supports flyback and inverting charge pump topologies, with D-pin current limit of 350mA and rectifier forward drop of 0.64V at 150mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 16V - supports single-cell Li+ (3.0–4.2V), dual-cell alkaline, and industrial 12V rails without pre-regulation. |
| Output Voltage Range | Up to –38V - enables high-voltage OLED and LCD bias generation without transformers or external diodes. |
| Switch Current Limit | 200mA - sets maximum inductor ramp current; determines peak output current capability in flyback mode. |
| Quiescent Current | 40µA active / <1µA shutdown - extends battery life in always-on portable devices with infrequent wake cycles. |
| FB Reference Current | 10µA sink - enables accurate, temperature-stable output setting with one resistor; eliminates feedback divider loading error. |
| Switch Off-Time | 300ns - permits use of small 10µH inductors and low-ESR ceramic capacitors for minimal PCB footprint. |
| Package | 8-Lead DFN (2mm × 2mm × 0.75mm) - thermally enhanced with exposed GND pad; compatible with automated reflow and space-constrained layouts. |
Pinout & Package
LT3483EDC#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-density layout and efficient heat dissipation when soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 3) | Feedback input | Sinks precisely trimmed 10µA; connects to output via single resistor R1 to set VOUT = –10µA × R1. |
| GND (Pins 2 & 3) | Ground reference | Two dedicated GND pins reduce ground impedance; exposed pad (Pin 9) must be soldered to PCB ground for thermal and electrical performance. |
| SW (Pin 1) | Switch collector | Connects to inductor L1 and flying capacitor; 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 to suppress input ripple and supply noise. |
| 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; <0.4V disables device (<1µA IQ); >1.5V enables operation; 6–10µA input bias. |
| NC (Pin 7) | No connection | Internally unconnected; must remain floating or tied to GND per layout best practice (no functional impact). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40V Schottky diode | Eliminates external diode BOM cost and board area; reduces forward drop to 0.64V at 150mA, improving light-load efficiency. |
| One-resistor feedback | Uses internal 10µA sink to set output voltage; removes need for resistor divider, reducing component count and feedback error. |
| 300ns fixed off-time control | Enables stable operation with tiny 10µH inductors and 0.22µF–4.7µF ceramic output capacitors; minimizes solution size to ~40mm². |
| Output short-circuit protection | Proprietary current limiting prevents damage during sustained output shorts, even at 16V VIN - no external foldback circuitry required. |
| Low 40µA quiescent current | Extends battery runtime in standby mode for handheld instruments and portable medical devices operating on coin cells or Li+ batteries. |
Applications
| Application 1 | Application 2 |
|---|---|
Use Scenario: Biasing active-matrix OLED display panels requiring –15V to –22V at 5–10mA in smartphones and wearables. IC Role / Device Role / Timing Role: Inverting charge pump DC/DC converter generating stable negative rail from 3.6V battery input. Use Value: Enables compact, transformerless OLED bias with <3% efficiency loss from optional 10Ω series resistor on D pin, supporting ultra-thin form factors. | Use Scenario: Powering CCD/CMOS image sensor analog front-ends needing –5V to –8V at 20–25mA in digital cameras and machine vision modules. IC Role / Device Role / Timing Role: Regulated negative supply source with fast transient response for sensor bias and ADC reference circuits. Use Value: Delivers 25mA at –8V with 20mV output ripple using 0.22µF ceramic output cap and 5pF FB compensation, meeting low-noise imaging requirements. |
| Application 3 | Application 4 |
Use Scenario: Providing backup memory bias (–3V to –5V) for SRAM or FRAM in industrial controllers during main power failure. IC Role / Device Role / Timing Role: Low-IQ inverting converter activated by brown-out detector to sustain memory retention from supercapacitor or backup battery. Use Value: Draws only 40µA in active mode and <1µA in shutdown, extending hold-up time from microfarad-range backup caps without compromising reliability. | Use Scenario: Generating gate drive voltage for high-side NMOS switches or op-amp dual supplies in portable test equipment. IC Role / Device Role / Timing Role: Compact negative rail generator supporting ±5V or ±12V split supplies from single-ended input. Use Value: Achieves –38V output with 10µH inductor and 0.47µF flying capacitor, enabling wide-range programmable bias without custom magnetics. |
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#TRPBF | Dual-output (boost + inverter), 250mA switch, integrated Schottkys, DFN-10 package; higher IQ (40µA same), wider VIN (2.3–15V). | Supports simultaneous positive and negative rails; better for systems needing ±VOUT from single input. | Select when dual-rail generation is required; not pin-compatible - requires new layout and feedback network redesign. |
| LT1617ES6#TRPBF | TSOT-23-6, 350mA switch, 20µA IQ, 1.2V–15V VIN; no integrated Schottky - external diode required. | Lower IQ and higher switch current suit longer battery life and higher load demands; larger solution size due to external diode. | Choose for ultra-low-power applications where 20µA IQ outweighs added BOM and layout complexity of external diode. |
Compared with LT3483EDC#TRPBF, LT3463EDD#TRPBF adds dual-rail flexibility at the cost of larger package and non-drop-in replacement, while LT1617ES6#TRPBF trades integrated diode convenience for lower IQ and higher output current - both require schematic and layout revision.
Availability
LT3483EDC#TRPBF is available at Aetrix Electronics and suitable for OLED bias, digital camera power management, and battery-backed memory systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3483EDC#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, 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 LT3483EDC#TRPBF 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 negative output voltage achievable with the LT3483EDC#TRPBF?
The LT3483EDC#TRPBF supports regulated negative outputs up to –38V, enabled by its 40V internal switch rating and robust flyback/charge pump topology. This capability is confirmed across the full –40°C to 85°C operating range and does not require external components beyond standard inductors and capacitors. Output stability at –38V depends on proper layout, inductor saturation current margin, and input voltage headroom per the datasheet's application guidelines.
Does the LT3483EDC#TRPBF require an external Schottky diode?
No, the LT3483EDC#TRPBF integrates a 40V Schottky diode internally, eliminating the need for an external diode in standard inverting flyback and charge pump configurations. The D pin connects directly to the internal diode anode, simplifying design and reducing BOM count. External diodes are only used in specialized configurations such as synchronous rectification or hybrid topologies not supported by the LT3483EDC#TRPBF's architecture.
How is the output voltage programmed on the LT3483EDC#TRPBF?
The LT3483EDC#TRPBF uses one-resistor feedback: connect a resistor R1 between the FB pin and the negative output rail. The output voltage is calculated as VOUT = –10µA × R1. For example, an 806kΩ resistor sets VOUT = –8.06V. This method leverages the device's precisely trimmed 10µA FB sink current, ensuring accuracy without divider ratio errors or loading effects common in two-resistor networks.
What is the shutdown current specification for the LT3483EDC#TRPBF?
The LT3483EDC#TRPBF draws less than 1µA of supply current in shutdown mode when the SHDN pin is pulled to GND. This value is guaranteed over the full –40°C to 85°C temperature range and is measured with VIN applied and no load. The ultra-low shutdown current makes the LT3483EDC#TRPBF suitable for battery-powered systems requiring multi-year shelf life or extended sleep intervals between active periods.
Can the LT3483EDC#TRPBF drive a 25mA load at –8V from a 3.6V input?
Yes, the LT3483EDC#TRPBF can reliably deliver 25mA at –8V from a 3.6V input, as demonstrated in the datasheet's Typical Application TA01a. Efficiency exceeds 65% at this operating point, with power loss under 15mW. Successful implementation requires a 10µH inductor rated for ≥300mA saturation current, 4.7µF input capacitor, 0.22µF output capacitor, and proper PCB layout minimizing SW/D node loop area and grounding the exposed pad.
LT3483EDC#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3483EDC#TRPBF FAQ
1.How can I place an order for LT3483EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3483EDC#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 LT3483EDC#TRPBF reliable?
The price and inventory of LT3483EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3483EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3483EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3483EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3483EDC#TRPBF?
LT3483EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3483EDC#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 LT3483EDC#TRPBF?
For technical support, including LT3483EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3483EDC#TRPBF requirements.
6.How does Aetrix verify that LT3483EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3483EDC#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 LT3483EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3483EDC#TRPBF?
All LT3483EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3483EDC#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 LT3483EDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3483EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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