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Analog Devices Inc. LT3460EDC-1#TRMPBF
- Part No.:
- LT3460EDC-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT3460EDC-1#TRMPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 180MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,499
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Product details
Overview
LT3460EDC-1#TRMPBF from Analog Devices (formerly Linear Technology) is a 650kHz fixed-frequency step-up DC/DC converter with integrated 180mA switch, designed for low-current bias supply generation in space-constrained applications. It operates from 2.5V to 16V input, delivers up to 36V output, and features 1.255V feedback reference, <1μA shutdown current, and 1mA quiescent current. It is used in CCD bias supplies and TFT-LCD panel bias rails.
For engineers reviewing the LT3460EDC-1#TRMPBF datasheet, LT3460EDC-1#TRMPBF pinout, LT3460EDC-1#TRMPBF application, or LT3460EDC-1#TRMPBF equivalent, key selection criteria include switching frequency (650kHz), integrated switch current rating (180mA), feedback voltage accuracy (±20mV), thermal performance in DFN package (θJA = 102°C/W), and compatibility with small ceramic output capacitors.
Technical Context
The LT3460EDC-1#TRMPBF employs constant-frequency peak current mode control with internal 1.255V reference and ramp compensation. Its 650kHz oscillator enables use of compact 22μH inductors and low-ESR ceramic capacitors while maintaining predictable EMI profiles.
It integrates a 38V-rated NPN switch with 350mV typical VCE(SAT) at 100mA, supports soft-start via RC filter on SHDN, and uses external resistor divider for output regulation. The feedback loop includes internal RC/CC compensation but requires optional feed-forward capacitor (CF) for stable operation across load and input variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 650kHz - Enables use of sub-3mm inductors and 1μF ceramic output caps; reduces filtering complexity vs lower-frequency boosters. |
| Max Output Voltage | 36V - Supports high-voltage bias rails for CCDs, LCD gate drivers, and medical sensor interfaces. |
| Integrated Switch Current | 180mA - Sufficient for 70mA @ 12V (typical 5V→12V conversion) with margin; limits max continuous output power to ~2.5W. |
| Feedback Reference | 1.255V ±20mV - Sets output via R1/R2 divider; tolerance directly impacts output accuracy (e.g., ±1.6% error at VOUT=12V). |
| Quiescent Current | 1mA - Enables battery-backed systems to maintain >100-hour runtime at light loads without compromising startup speed. |
| Shutdown Current | <1μA - Allows true off-state power isolation in always-on subsystems like sensor wake-up circuits. |
| Input Voltage Range | 2.5V to 16V - Accepts single Li-ion (2.7–4.2V), 5V rail, or 12V industrial bus without pre-regulation. |
Pinout & Package
LT3460EDC-1#TRMPBF is housed in a 6-lead, 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 7 = GND). The package provides low thermal resistance (θJA = 102°C/W) and supports reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 3) | Switch Node | Connects to inductor and Schottky diode anode; high dv/dt node requiring minimal trace area to limit EMI radiation. |
| GND (Exposed Pad, Pin 7) | Power Ground | Primary thermal and electrical return path; must be soldered to large PCB ground plane for thermal dissipation and noise control. |
| FB (Pin 1) | Feedback Input | Senses output via resistor divider; high-impedance (5–80nA bias) node sensitive to noise-requires short, shielded routing. |
| SHDN (Pin 6) | Enable/Soft-Start | Active-high logic input; 1.5V threshold enables device; RC network here controls output voltage ramp rate during startup. |
| VIN (Pin 4) | Input Supply | Accepts 2.5–16V; requires local 4.7μF ceramic bypass capacitor placed within 2mm of pin to suppress high-frequency ripple. |
| NC (Pins 2 & 5) | No-Connect | Internally unconnected; recommended to tie to GND for improved thermal conduction and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| 650kHz Fixed Switching | Enables consistent EMI filtering design and predictable noise spectrum; avoids variable-frequency jitter in timing-critical analog bias rails. |
| 180mA Integrated Switch | Eliminates external transistor and drive circuitry; reduces BOM count and layout area in compact DFN footprint. |
| 1.255V Precision Feedback | Supports ±1.2% output regulation over temperature and line; critical for stable CCD pixel charge transfer and LCD VCOM stability. |
| <1μA Shutdown Current | Permits zero-power standby in battery-powered diagnostic equipment between measurement cycles. |
| DFN Thermal Performance | θJA = 102°C/W enables 180mA continuous operation at 70°C ambient without derating when exposed pad is properly soldered. |
Applications
| CCD Bias Supply | TFT-LCD Gate Driver Bias |
|---|---|
Use Scenario: Generating +15V to +36V bias for CCD image sensor vertical/horizontal shift registers in portable medical endoscopes. IC Role / Device Role / Timing Role: Primary high-voltage DC/DC regulator providing stable, low-noise bias under dynamic load steps during frame readout. Use Value: 650kHz switching minimizes interference with CCD analog signal chain; 1.255V reference ensures <±20mV bias drift across –40°C to 85°C operating range. | Use Scenario: Supplying VGH (20–30V) and VGL (–10V) gate driver rails in automotive-grade TFT-LCD instrument clusters. IC Role / Device Role / Timing Role: Positive rail generator in dual-rail bias architecture; paired with inverting charge pump for negative rail. Use Value: 38V switch rating accommodates 30V VGH with 20% margin; DFN package fits tight bezel space behind display module. |
| XDSL Line Driver Power | Portable Medical Diagnostic Equipment |
Use Scenario: Providing +12V bias to DSL line driver amplifiers in customer-premises equipment (CPE) modems. IC Role / Device Role / Timing Role: Local point-of-load booster converting 3.3V or 5V system rail to higher analog supply for line interface ICs. Use Value: Low 1mA quiescent current extends standby time in energy-efficient CPE designs; SC70/DFN variants support automated placement. | Use Scenario: Powering photomultiplier tube (PMT) high-voltage bias stages in handheld blood analyzers. IC Role / Device Role / Timing Role: Isolated high-voltage source feeding PMT dynode chain; operated in burst mode synchronized with optical sampling. Use Value: <1μA shutdown current prevents battery drain during idle periods; 650kHz frequency avoids aliasing with optical sampling clock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3461ESC6#TRMPBF | 1.3MHz switching, 300mA switch, integrated Schottky, same SC70/DFN footprint options | Higher efficiency at >50mA loads; eliminates external diode; not pin-compatible due to different pinout (SW/FB swapped) | Select when higher output current or reduced component count is required; verify layout revision for pin mapping. |
| LTC3400EDC#TRMPBF | Synchronous rectification, 1.2MHz, 600mA switch, 0.85V min VIN, no integrated diode | Better light-load efficiency (19μA IQ); requires external diode; incompatible feedback reference (0.6V) | Choose for ultra-low IQ battery apps below 10mA; redesign feedback divider and output diode; not drop-in. |
Compared with LT3460EDC-1#TRMPBF, LT3460EDC-1#TRMPBF offers optimized 650kHz operation for low-noise bias rails, while LT3461ESC6#TRMPBF trades noise for higher current and integration, and LTC3400EDC#TRMPBF sacrifices simplicity for superior light-load efficiency and wider input range.
Availability
LT3460EDC-1#TRMPBF is available at Aetrix Electronics and suitable for CCD bias supply, TFT-LCD gate driver bias, and portable medical diagnostic equipment requiring stable component supply across industrial temperature range (–40°C to 85°C).
Supply support for LT3460EDC-1#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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio. Linear's legacy design ethos emphasizes robustness, accuracy, and ease of use in demanding applications.
The LT3460/LT3460-1 product line was engineered specifically for compact, high-voltage bias generation in imaging, display, and telecom infrastructure-prioritizing low EMI, thermal efficiency in tiny packages, and stable regulation under dynamic loads.
FAQ
What is the maximum output voltage achievable with LT3460EDC-1#TRMPBF?
The LT3460EDC-1#TRMPBF supports up to 36V output voltage, limited by its 38V-rated internal switch. This allows reliable generation of common high-voltage rails such as +24V for industrial sensors or +30V for LCD gate drivers. Operation beyond 36V risks exceeding switch breakdown voltage and is not characterized or guaranteed.
Does LT3460EDC-1#TRMPBF require an external Schottky diode?
Yes, LT3460EDC-1#TRMPBF requires an external Schottky diode connected between SW and VOUT. Unlike later-generation parts (e.g., LT3461), it does not integrate the diode. A low-VF, fast-recovery Schottky such as CMDSH2-3 is recommended to minimize conduction loss and ensure stable regulation at full load.
Can LT3460EDC-1#TRMPBF operate from a single-cell Li-ion battery?
Yes, LT3460EDC-1#TRMPBF operates from 2.5V minimum input, making it compatible with discharged single-cell Li-ion (2.7V–4.2V). At 2.7V input, it can deliver 12V/40mA with >70% efficiency using standard 22μH inductor and ceramic caps, as verified in Typical Application TA07.
What is the purpose of the NC pins on LT3460EDC-1#TRMPBF?
The NC pins (Pins 2 and 5) on LT3460EDC-1#TRMPBF are not connected to internal circuitry. Per the datasheet, they should be tied to GND to improve thermal conduction through the package and reduce EMI susceptibility. Leaving them floating may degrade thermal performance and increase radiated emissions.
How does the feedback compensation work in LT3460EDC-1#TRMPBF?
LT3460EDC-1#TRMPBF includes internal RC/CC compensation components, but external feed-forward capacitor CF (e.g., 22pF) from VOUT to FB is required for stable loop response across operating conditions. Without CF, phase margin drops to ~20°; with CF = 22pF, it improves to ~60°, as shown in Figure 4 of the LT3460 datasheet.
LT3460EDC-1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.255V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 180mA (Switch)
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LT3460EDC-1#TRMPBF FAQ
1.How can I place an order for LT3460EDC-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3460EDC-1#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 LT3460EDC-1#TRMPBF reliable?
The price and inventory of LT3460EDC-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3460EDC-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3460EDC-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3460EDC-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3460EDC-1#TRMPBF?
LT3460EDC-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3460EDC-1#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 LT3460EDC-1#TRMPBF?
For technical support, including LT3460EDC-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3460EDC-1#TRMPBF requirements.
6.How does Aetrix verify that LT3460EDC-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3460EDC-1#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 LT3460EDC-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3460EDC-1#TRMPBF?
All LT3460EDC-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3460EDC-1#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 LT3460EDC-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT3460EDC-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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