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Analog Devices Inc. LT3462AEDC#TRPBF
- Part No.:
- LT3462AEDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3462AEDC#TRPBF.pdf
- Description:
- IC REG CUK ADJ 250MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,781
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Product details
Overview
LT3462AEDC#TRPBF 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 2.5V–16V input and up to –38V output, used in CCD bias, LCD bias, and GaAs FET bias supplies.
For engineers reviewing the LT3462AEDC#TRPBF datasheet, LT3462AEDC#TRPBF pinout, LT3462AEDC#TRPBF application, or LT3462AEDC#TRPBF equivalent, key selection criteria include dual-inductor topology support, 1.265V reference accuracy, shutdown current <10µA, and DFN-8 package thermal performance with exposed GND pad.
Technical Context
The LT3462AEDC#TRPBF implements constant-frequency current-mode control with internal ramp compensation, enabling stable regulation across wide input/output differentials. Its dual-inductor inverting topology inherently filters both input and output currents, achieving ≤1mVP-P ripple with ceramic capacitors.
Switching at 2.7MHz allows use of sub-22µH inductors (e.g., 10µH coupled or 22µH discrete) and low-profile 1µF+ flying/output ceramics. The SDREF pin provides dual functionality: 1.265V reference sourcing up to 180µA and active-low shutdown with 2µA pull-up for turn-on sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.7MHz typical - enables compact magnetics and low-profile layout |
| Input Voltage Range | 2.5V to 16V - supports single-cell Li+ to industrial 12V rails |
| Output Voltage Range | Up to –38V - accommodates high-voltage bias for CCDs and RF FETs |
| Reference Voltage | 1.265V ±20mV - sets feedback divider ratio for precise negative output regulation |
| Switch VCE(SAT) | 270mV at 250mA - minimizes conduction loss in high-current inverting topologies |
| Shutdown Current | <10µA - preserves battery life in portable bias applications |
| Package | 8-Lead DFN (2mm × 2mm × 0.75mm) with exposed GND pad - achieves θJA = 88.5°C/W |
Pinout & Package
LT3462AEDC#TRPBF uses an 8-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed thermal pad soldered to PCB ground. Pin 9 (exposed pad) is electrically GND and required for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 5) | Input supply connection | Must be locally bypassed with ≥1µF ceramic capacitor; max 16V rating |
| D (Pin 7) | Anode of integrated Schottky diode | Connects to flying capacitor negative terminal and L2; max reverse voltage –40V |
| SDREF (Pin 8) | Shutdown control + 1.265V reference | Pull to GND to disable; sources up to 180µA at 1.265V when enabled |
| SW (Pin 4) | Switch node | Connects to L1 and flying capacitor positive terminal; max 40V swing |
| GND (Pins 2,3) | Power and signal ground | Low-impedance local ground plane tie; exposed pad (Pin 9) must be soldered to GND |
| FB (Pin 1) | Feedback input | High-impedance (≤50nA bias), referenced to GND; regulates VOUT = –1.265V × R1/R2 |
| NC (Pin 6) | No connect | Not internally bonded; leave unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky rectifier | Eliminates external diode, reducing BOM count and footprint in dual-inductor inverter designs |
| 2.7MHz fixed-frequency operation | Enables use of 10µH coupled or 22µH discrete inductors and 1µF ceramic flying caps |
| 1mVP-P output ripple (ceramic caps) | Meets low-noise requirements for analog sensor bias without post-regulation filtering |
| Ground-referenced FB pin | Allows high-value feedback resistors without accuracy degradation from input bias current |
| Low VCE(SAT) switch (270mV @ 250mA) | Improves efficiency at moderate loads versus competitive PNP-based inverters |
Applications
| CCD Bias Supply | LCD Bias Supply |
|---|---|
Use Scenario: Providing –8V to –12V bias for charge-coupled device image sensors in medical endoscopes and industrial cameras. IC Role / Device Role / Timing Role: Inverting DC/DC converter generating stable negative rail from 3.3V or 5V logic supply. Use Value: 2.7MHz operation minimizes EMI in sensitive imaging circuits; 1mVP-P ripple prevents pixel noise corruption. | Use Scenario: Generating –5V to –15V gate drive voltages for TFT-LCD source driver ICs in handheld displays. IC Role / Device Role / Timing Role: Compact inverting regulator delivering regulated negative voltage from single-cell Li+ (2.7–4.2V). Use Value: DFN-8 package fits tight board space; shutdown current <10µA extends battery runtime during display sleep mode. |
| GaAs FET Bias Supply | General Purpose Negative Supply |
Use Scenario: Supplying –5V to –12V gate bias for GaAs power amplifiers in 5G small-cell RF front-ends. IC Role / Device Role / Timing Role: High-efficiency inverter converting 3.3V system rail to negative gate control voltage. Use Value: 2.7MHz switching avoids interference with RF bands; 40V switch rating supports >30V differential headroom. | Use Scenario: Creating isolated –5V or –12V rails for op-amp dual supplies, data acquisition references, or interface level-shifting. IC Role / Device Role / Timing Role: General-purpose inverting converter replacing discrete transistor/diode solutions. Use Value: Integrated Schottky and 1.265V reference simplify design; DFN-8 package enables high-density mixed-signal layouts. |
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 |
|---|---|---|---|
| LT3462AES6#TRPBF | Same core architecture but in 6-lead TSOT-23; 1.2MHz switching; lower thermal performance (θJA = 192°C/W) | Suitable where board area is constrained but thermal load is light; not viable for >60mA continuous loads | Select LT3462AES6#TRPBF only if DFN-8 layout space is unavailable and power dissipation remains below 150mW. |
| LT1931AEDD#TRPBF | 2.2MHz switching; 1A switch current limit; no integrated Schottky; requires external diode | Better for higher-output-current applications (up to 300mA); adds BOM cost and footprint for external diode | Choose LT1931AEDD#TRPBF when output current exceeds 100mA or when external diode selection is needed for specialized reverse recovery behavior. |
Compared with LT3462AES6#TRPBF, the LT3462AEDC#TRPBF delivers 127% higher switching frequency and 54% lower thermal resistance, enabling smaller passives and higher power density; versus LT1931AEDD#TRPBF, it trades higher peak current capability for integrated diode simplicity and lower quiescent current.
Availability
LT3462AEDC#TRPBF is available at Aetrix Electronics and suitable for CCD bias, LCD bias, and GaAs FET bias applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for medical, industrial, and telecom equipment.
Supply support for LT3462AEDC#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 (now part of Analog Devices, Inc., following merger with Linear Technology) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and signal integrity.
The LT3462A product line delivers compact, high-frequency inverting DC/DC converters optimized for low-noise negative bias generation in imaging, display, and RF systems.
FAQ
What is the maximum input-to-output differential voltage supported by the LT3462AEDC#TRPBF?
The LT3462AEDC#TRPBF supports up to 38V differential between VIN and VOUT in dual-inductor inverting topologies, enabled by its 40V-rated internal switch. This allows configurations such as 12V input to –36V output or 5V input to –5V output while maintaining safe SOA margins. The absolute maximum SW pin voltage is 40V, and D pin withstands –40V reverse bias.
How does the SDREF pin function in the LT3462AEDC#TRPBF?
The SDREF pin on the LT3462AEDC#TRPBF serves two roles: it acts as an active-low shutdown input and as a 1.265V reference output. When pulled to GND, it disables the converter, reducing supply current to <10µA. When left floating or pulled high via external circuitry, it sources up to 180µA at 1.265V to bias the feedback resistor divider, enabling precise output regulation in the LT3462AEDC#TRPBF.
Can the LT3462AEDC#TRPBF operate with ceramic output capacitors only?
Yes, the LT3462AEDC#TRPBF is fully compatible with ceramic output capacitors and achieves ≤1mVP-P output ripple when using X5R or X7R dielectrics. The datasheet specifies 1µF minimum for high-VOUT (e.g., –36V) and up to 10µF for low-VOUT (e.g., –5V) applications. Ceramic caps are mandatory for stable 2.7MHz operation and low ESR performance in the LT3462AEDC#TRPBF.
What is the recommended inductor value for the LT3462AEDC#TRPBF in a 5V-to–5V application?
For a 5V-to–5V inverting application, the LT3462AEDC#TRPBF recommends 22µH discrete inductors (e.g., Murata LQH32CN220) or a 10µH coupled inductor (e.g., Wurth 50310057-100). These values balance ripple current, size, and efficiency per the datasheet's Table 3 and Typical Application TA05a. Inductor saturation current must exceed 250mA to avoid core saturation under peak load in the LT3462AEDC#TRPBF.
Does the LT3462AEDC#TRPBF require an external Schottky diode?
No, the LT3462AEDC#TRPBF integrates a Schottky diode with 800–1100mV forward drop at 250mA and <4µA leakage at –40V, eliminating the need for external rectification. This integration reduces component count, PCB area, and assembly cost-confirmed in the "Integrated Schottky Rectifier" feature and PIN FUNCTIONS section of the LT3462AEDC#TRPBF datasheet.
LT3462AEDC#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
- 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#TRPBF FAQ
1.How can I place an order for LT3462AEDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3462AEDC#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 LT3462AEDC#TRPBF reliable?
The price and inventory of LT3462AEDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3462AEDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3462AEDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3462AEDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3462AEDC#TRPBF?
LT3462AEDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3462AEDC#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 LT3462AEDC#TRPBF?
For technical support, including LT3462AEDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3462AEDC#TRPBF requirements.
6.How does Aetrix verify that LT3462AEDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3462AEDC#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 LT3462AEDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3462AEDC#TRPBF?
All LT3462AEDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3462AEDC#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 LT3462AEDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3462AEDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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