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Analog Devices Inc. LT3462AEDC#TRMPBF
- Part No.:
- LT3462AEDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3462AEDC#TRMPBF.pdf
- Description:
- IC REG CUK ADJ 250MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:551
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Product details
Overview
LT3462AEDC#TRMPBF from Analog Devices is a fixed-frequency current-mode inverting DC/DC converter with integrated Schottky diode and 270mV VCE(SAT) switch, operating at 2.7MHz switching frequency, supporting input voltages from 2.5V to 16V and output voltages down to –38V, used in LCD bias, CCD bias, and GaAs FET bias supplies.
For engineers reviewing the LT3462AEDC#TRMPBF datasheet, LT3462AEDC#TRMPBF pinout, LT3462AEDC#TRMPBF application, or LT3462AEDC#TRMPBF equivalent, key selection criteria include its 2.7MHz operation enabling compact 10µH inductors and ceramic capacitors, dual-inductor topology delivering <1mVP–P output ripple, and DFN-8 (2mm × 2mm) package with exposed GND pad for thermal management.
Technical Context
The LT3462AEDC#TRMPBF implements constant-frequency current-mode control with internal ramp compensation, where peak switch current is regulated via PWM comparator feedback from a sense resistor and stabilizing ramp. Its dual-inductor inverting topology inherently filters both input and output currents, reducing conducted EMI versus charge-pump alternatives.
SDREF serves as dual-function pin: pulled low to enable shutdown (<10µA quiescent current), and sourcing up to 180µA at 1.265V to bias the external feedback divider; FB is ground-referenced with only 15nA typical bias current, enabling high-value resistors without accuracy loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.7MHz typical - enables use of 10µH inductors and sub-2mm ceramic capacitors, minimizing board area. |
| Input Voltage Range | 2.5V to 16V - supports single-cell Li+ (2.7–4.2V), 3.3V, and 5V rails without pre-regulation. |
| Output Voltage Range | Up to –38V - allows high negative bias generation for CCD, LCD, and RF amplifier applications. |
| Switch VCE(SAT) | 270mV at 250mA - reduces conduction loss and improves efficiency at medium load currents. |
| Reference Voltage | 1.265V ±20mV - stable, low-impedance (40Ω) reference for precise output regulation via external resistor divider. |
| Shutdown Current | <10µA - ensures ultra-low power-off leakage in battery-powered portable systems. |
| Output Ripple | <1mVP–P with ceramic caps - meets noise-sensitive analog supply requirements without post-filtering. |
Pinout & Package
LT3462AEDC#TRMPBF uses an 8-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed GND pad (Pin 9) soldered to PCB ground plane for thermal performance (θJA = 88.5°C/W). Pin numbering follows standard DFN top-view orientation with Pin 1 marked by bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 5) | Input Supply | Accepts 2.5V–16V; requires local 1µF ceramic bypass capacitor placed adjacent to pin. |
| D (Pin 7) | Schottky Anode | Connects to negative terminal of flying capacitor and L2; integrates 800mV forward drop Schottky. |
| SDREF (Pin 8) | Shutdown / Reference | Drives low to enter shutdown (<10µA IQ); sources 180µA at 1.265V to bias R2 in feedback network. |
| GND (Pins 2,3) | Power Ground | Primary return path for switch, Schottky, and internal circuits; tied directly to local ground plane. |
| FB (Pin 1) | Feedback Input | Ground-referenced node; regulates when voltage equals 0V, setting VOUT = –1.265V × (R1/R2). |
| SW (Pin 4) | Switch Node | Connects to positive terminal of flying capacitor and L1; switches at 2.7MHz with 270mV saturation. |
| NC (Pin 6) | No Connect | Internally unused; must be left floating or tied to GND per layout guidelines. |
| Exposed Pad (Pin 9) | Thermal GND | Electrically and thermally connected to internal GND; must be soldered to PCB ground for rated θJA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diode | Eliminates external diode, saving 1.5mm² board area and reducing BOM count while maintaining 800mV forward drop at 250mA. |
| 2.7MHz Fixed Switching | Enables 10µH inductors and 1µF ceramic capacitors-reducing solution size by >40% vs. 1.2MHz LT3462 variant. |
| Dual-Inductor Inverting Topology | Filters both input and output currents, achieving <1mVP–P ripple with X7R/X5R ceramics-critical for analog bias rails. |
| Low-Impedance 1.265V Reference | 40Ω output impedance allows direct biasing of high-value feedback resistors (e.g., 267kΩ/68.1kΩ), minimizing divider current error. |
| Ground-Referenced FB Input | 15nA max bias current enables >1MΩ feedback networks without compromising regulation accuracy or temperature drift. |
Applications
| CCD Bias Supply | LCD Panel Bias |
|---|---|
Use Scenario: Generating –8V to –12V at 30–35mA for charge-coupled device sensor bias in portable imaging systems. IC Role / Device Role / Timing Role: Inverting DC/DC converter providing regulated negative rail with ultra-low ripple to minimize image noise and dark current. Use Value: 2.7MHz operation allows 10µH coupled inductors and 4.7µF ceramic output cap-enabling <3mm² total passive footprint on space-constrained camera modules. |
Use Scenario: Supplying –5V at 100mA for TFT-LCD source driver ICs in handheld displays. IC Role / Device Role / Timing Role: High-efficiency inverting regulator delivering stable negative gate drive voltage with minimal EMI coupling into display data lines. Use Value: Dual-inductor topology suppresses input current ripple, reducing conducted noise into shared 3.3V system rail and eliminating need for additional LC filtering. |
| GaAs FET Bias | General Purpose Negative Supply |
Use Scenario: Providing –12V at 30mA from 3.3V input for GaAs pHEMT amplifier bias in 5GHz wireless front-ends. IC Role / Device Role / Timing Role: Compact, high-frequency inverter delivering low-noise negative bias to maintain amplifier linearity and gain stability. Use Value: 270mV VCE(SAT) minimizes dropout loss at 30mA, sustaining >75% efficiency across temperature-critical for thermal-limited RF modules. |
Use Scenario: Creating –36V at 36mA from 12V input for op-amp dual-rail supplies in industrial test equipment. IC Role / Device Role / Timing Role: General-purpose inverting converter supporting wide output range (–5V to –38V) with fixed 2.7MHz clock for predictable EMI profile. Use Value: 40V-rated switch and 77% max duty cycle allow full –36V output with margin, while DFN-8 package simplifies thermal design in multi-rail power subsystems. |
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 |
|---|---|---|---|
| LT1931AEDD#TRMPBF | 2.2MHz switching, 1A switch current limit, no integrated Schottky, requires external diode. | Higher output current capability but larger solution size due to external diode and 47µH inductor. | Select when >100mA output current or higher efficiency at heavy loads is required; avoid if board area is constrained. |
| LT3463EDE#TRMPBF | Dual-output (boost + inverter), 250mA switch, integrated Schottky, 1.2MHz switching, DFN-10 package. | Supports simultaneous positive and negative rails but lower switching frequency increases inductor size. | Select when dual-rail generation is needed; avoid for single-rail, space-critical designs requiring 2.7MHz optimization. |
Compared with LT3462AEDC#TRMPBF, LT1931AEDD#TRMPBF delivers higher current but demands more board area and external components, while LT3463EDE#TRMPBF offers dual-rail flexibility at the cost of reduced switching speed and larger magnetics-making LT3462AEDC#TRMPBF optimal for compact, single-negative-rail, medium-current applications.
Availability
LT3462AEDC#TRMPBF is available at Aetrix Electronics and suitable for CCD bias, LCD panel bias, and GaAs FET bias applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LT3462AEDC#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
LT3462AEDC#TRMPBF belongs to the Linear Technology (now part of Analog Devices) µPower inverting DC/DC converter family, designed specifically for compact, low-noise negative voltage generation in portable and space-constrained analog systems.
FAQ
What is the maximum output voltage achievable with LT3462AEDC#TRMPBF?
The LT3462AEDC#TRMPBF supports a VIN-to-VOUT differential of up to 38V in dual-inductor inverting topology. With a 16V input, it can generate up to –38V output; with a 5V input, it delivers up to –36V. The absolute minimum output is limited by the 1.265V reference and feedback resistor ratio, not by internal circuitry.
Does LT3462AEDC#TRMPBF require an external Schottky diode?
No, LT3462AEDC#TRMPBF integrates a Schottky diode with 800mV forward drop at 250mA and 4µA leakage at –40V. This eliminates the need for an external diode, reducing component count, board area, and potential failure points in the power path.
What is the recommended inductor value for LT3462AEDC#TRMPBF in a dual-inductor configuration?
For LT3462AEDC#TRMPBF, a 22µH inductor is recommended for each leg in dual-inductor topology. Coupled inductors (e.g., Würth 50310057-100) may use 10µH per winding. Inductors must have ≥0.25A saturation current rating and <1Ω DCR to maintain regulation and efficiency.
How does the SDREF pin function in LT3462AEDC#TRMPBF?
In LT3462AEDC#TRMPBF, SDREF is a dual-function pin: pulling it low disables the regulator (quiescent current <10µA), while leaving it open enables operation and sources up to 180µA at 1.265V to bias the feedback resistor R2. It also supports optional soft-start via capacitor to VOUT.
Is LT3462AEDC#TRMPBF pin-compatible with the LT3462ES6 series?
No, LT3462AEDC#TRMPBF uses an 8-lead DFN package with different pinout and functionality (e.g., NC pin, exposed pad), while LT3462ES6 uses a 6-lead TSOT-23. They are not pin-compatible; PCB layout and schematic must be redesigned for migration between packages.
LT3462AEDC#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
- Output Configuration:
- Negative
- Topology:
- Cuk
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- -1.265V
- Voltage - Output (Max):
- -38V
- Current - Output:
- 250mA
- Frequency - Switching:
- 2.7MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT3462AEDC#TRMPBF FAQ
1.How can I place an order for LT3462AEDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3462AEDC#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 LT3462AEDC#TRMPBF reliable?
The price and inventory of LT3462AEDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3462AEDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3462AEDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3462AEDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3462AEDC#TRMPBF?
LT3462AEDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3462AEDC#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 LT3462AEDC#TRMPBF?
For technical support, including LT3462AEDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3462AEDC#TRMPBF requirements.
6.How does Aetrix verify that LT3462AEDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3462AEDC#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 LT3462AEDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3462AEDC#TRMPBF?
All LT3462AEDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3462AEDC#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 LT3462AEDC#TRMPBF part is unused and in its original packaging.
Return procedure for LT3462AEDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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