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Analog Devices Inc. LT3462AES6#TRMPBF
- Part No.:
- LT3462AES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3462AES6#TRMPBF.pdf
- Description:
- IC REG CUK ADJ 250MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,120
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Product details
Overview
LT3462AES6#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 2.5V–16V input and delivering up to –38V output in dual-inductor topology, used for LCD bias and GaAs FET bias supplies.
For engineers reviewing the LT3462AES6#TRMPBF datasheet, LT3462AES6#TRMPBF pinout, LT3462AES6#TRMPBF application, or LT3462AES6#TRMPBF equivalent, key selection criteria include 2.7MHz operation enabling compact magnetics, 1.265V reference accuracy (±20mV), low-noise 1mVP-P output ripple with ceramic capacitors, and shutdown current <10µA.
Technical Context
The LT3462AES6#TRMPBF implements constant-frequency current-mode control with internal ramp compensation, where peak switch current is regulated via PWM comparator feedback from a sensed current ramp. Its dual-inductor inverting topology inherently filters both input and output currents, reducing conducted EMI.
It features a dual-function SDREF pin that serves as both shutdown control input and 1.265V reference output (180µA source capability), with proprietary bias-current cancellation during shutdown to minimize residual loading on the feedback network.
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 external regulation. |
| Output Voltage Range | Up to –38V - determined by VIN–VOUT differential limit of 40V switch rating minus 2V headroom. |
| Reference Voltage | 1.265V ±20mV - sets output via FB divider; low impedance (40Ω) ensures stable regulation under high-resistor-divider conditions. |
| Quiescent Current | 3.6mA typical at VIN=5V - defines no-load power loss in active mode; drops to <10µA in shutdown. |
| Switch VCE(SAT) | 270mV at 250mA - reduces conduction loss in high-current phase, improving efficiency at >50mA loads. |
| Output Ripple | ~1mVP-P with ceramic caps - achieved via fixed-frequency operation and dual-inductor filtering, avoiding low-frequency noise of charge pumps. |
Pinout & Package
LT3462AES6#TRMPBF is housed in a 6-lead TSOT-23 (S6) package, 2.9mm × 1.6mm × 1mm profile, with exposed pad not present in this variant (only DFN variants feature exposed GND pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.5V–16V; requires local 1µF ceramic bypass placed adjacent to pin. |
| D | Anode of integrated Schottky diode | Connects to negative terminal of flying capacitor and L2; reverse leakage <4µA at –40V. |
| SDREF | Shutdown control / 1.265V reference output | Pull to GND to disable; sources up to 180µA at 1.265V for FB divider bias; includes soft-start capacitor node. |
| SW | Switch node | Drives external inductor L1; rated for 40V max; connects to positive terminal of flying capacitor. |
| GND | Power and signal ground | Common return for internal circuitry, switch, and reference; must tie directly to local ground plane. |
| FB | Feedback input | High-impedance (≤50nA bias), ground-referenced node; regulates VOUT = –1.265V × (R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky rectifier | Eliminates external diode, reducing BOM count and footprint; forward drop 800–1100mV at 250mA. |
| 2.7MHz fixed-frequency operation | Enables use of 10µH coupled inductors or 22µH discrete inductors, cutting solution size vs. 1.2MHz LT3462. |
| Dual-inductor inverting topology | Provides inherent input/output current filtering, achieving <1mVP-P ripple without additional LC stages. |
| Low shutdown current | <10µA quiescent draw in shutdown - critical for battery-powered LCD/GaAs bias where standby power must be minimized. |
| 1.265V reference with 40Ω output impedance | Supports high-value feedback resistors (e.g., 267k/68.1k for –5V) without degrading regulation accuracy. |
Applications
| LCD Bias Supply | GaAs FET Bias Supply |
|---|---|
|
Use Scenario: Generating stable –5V to –12V for TFT-LCD gate drivers and source drivers in portable displays. IC Role / Device Role / Timing Role: Inverting DC/DC converter providing negative rail with ultra-low ripple to prevent display flicker and ghosting. Use Value: 1mVP-P output ripple and 2.7MHz switching eliminate low-frequency beat notes with display scanning clocks. |
Use Scenario: Delivering –8V to –12V bias for GaAs pHEMT amplifiers in RF front-ends of wireless infrastructure and test equipment. IC Role / Device Role / Timing Role: High-efficiency negative voltage generator with fast transient response for amplifier gate control. Use Value: 270mV VCE(SAT) and 2.7MHz operation maintain >70% efficiency at 30mA load while minimizing thermal rise in compact RF modules. |
| CCD Bias Supply | General Purpose Negative Rail |
|
Use Scenario: Providing –12V to –15V for CCD image sensor substrate bias in medical and industrial cameras. IC Role / Device Role / Timing Role: Low-noise inverting converter supplying clean, stable negative voltage to reduce dark current and fixed-pattern noise. Use Value: Dual-inductor topology suppresses input current harmonics that could couple into sensitive analog pixel readout circuits. |
Use Scenario: Creating isolated negative rails for op-amp dual supplies, data acquisition front-ends, and sensor signal conditioning. IC Role / Device Role / Timing Role: General-purpose inverting regulator supporting wide VIN (2.5V–16V) and programmable VOUT via resistor divider. Use Value: Pin-compatible upgrade path from LT3462 with higher frequency and improved light-load efficiency for legacy designs. |
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 |
|---|---|---|---|
| LT3462ES6#TRMPBF | 1.2MHz switching frequency; lower max duty cycle (90% vs. 77%); identical pinout and package. | Better suited for cost-sensitive, lower-frequency designs where larger inductors are acceptable. | Select when board space allows 22µH inductors and EMI requirements permit lower switching frequency. |
| LT1931AEDC#TRMPBF | 2.2MHz operation; 1A switch current limit (vs. 420mA); 8-lead DFN only; no integrated Schottky. | Requires external diode but supports higher output current and wider VOUT range (up to –34V). | Choose when >100mA output current or –34V output is required, accepting added component count. |
Compared with LT3462ES6#TRMPBF, the LT3462AES6#TRMPBF delivers 2.7MHz operation for smaller passives and lower ripple, while LT1931AEDC#TRMPBF trades integrated diode for higher current capability and different package-neither is pin-compatible, but all three serve distinct points in the inverting converter design space.
Availability
LT3462AES6#TRMPBF is available at Aetrix Electronics and suitable for LCD bias, GaAs FET bias, and CCD bias applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LT3462AES6#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 (now part of Analog Devices, Inc. following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs.
The LT3462A product line was designed specifically for compact, low-noise negative voltage generation in space-constrained portable and RF systems, emphasizing integration, efficiency, and ease of layout.
FAQ
What is the maximum achievable output voltage magnitude for LT3462AES6#TRMPBF?
The LT3462AES6#TRMPBF supports output voltages down to –38V, constrained by its 40V-rated internal switch and the requirement that |VIN – VOUT| ≤ 40V. For example, with 3.3V input, the most negative output is –36.7V. This makes LT3462AES6#TRMPBF suitable for high-voltage bias applications such as CCD sensors and RF amplifier substrates.
Does LT3462AES6#TRMPBF require an external Schottky diode?
No, the LT3462AES6#TRMPBF integrates a Schottky diode with 800–1100mV forward drop at 250mA and <4µA reverse leakage at –40V. This eliminates the need for an external diode, reducing bill-of-materials count and PCB area-critical for compact LCD and RF bias designs using LT3462AES6#TRMPBF.
How does the SDREF pin function in LT3462AES6#TRMPBF?
The SDREF pin on LT3462AES6#TRMPBF serves two roles: pulling it low disables the device (shutdown current <10µA), and when left floating or pulled up, it sources up to 180µA at 1.265V to bias the FB divider. An optional soft-start capacitor from SDREF to VOUT controls output slew rate. This dual functionality simplifies system-level power sequencing in designs using LT3462AES6#TRMPBF.
What inductor values are recommended for LT3462AES6#TRMPBF in dual-inductor topology?
For LT3462AES6#TRMPBF in dual-inductor inverting configuration, 22µH discrete inductors or 10µH coupled inductors (e.g., Wurth 50310057-100) are recommended. Inductors must have ≥0.25A saturation current rating and <1Ω DCR. These values balance ripple current, efficiency, and size-enabling compact layouts where LT3462AES6#TRMPBF is deployed for LCD or GaAs bias.
Can LT3462AES6#TRMPBF operate from a 2.5V input supply?
Yes, LT3462AES6#TRMPBF specifies a minimum operating voltage of 2.5V and functions reliably across the full 2.5V–16V input range. At 2.5V input, it can generate –5V at 50mA with >65% efficiency (per typical curves), making LT3462AES6#TRMPBF suitable for single-cell Li+ and low-voltage industrial systems requiring negative rails.
LT3462AES6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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:
- TSOT-23-6
LT3462AES6#TRMPBF FAQ
1.How can I place an order for LT3462AES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3462AES6#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 LT3462AES6#TRMPBF reliable?
The price and inventory of LT3462AES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3462AES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3462AES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3462AES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3462AES6#TRMPBF?
LT3462AES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3462AES6#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 LT3462AES6#TRMPBF?
For technical support, including LT3462AES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3462AES6#TRMPBF requirements.
6.How does Aetrix verify that LT3462AES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3462AES6#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 LT3462AES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3462AES6#TRMPBF?
All LT3462AES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3462AES6#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 LT3462AES6#TRMPBF part is unused and in its original packaging.
Return procedure for LT3462AES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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