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Analog Devices Inc. LTC3459EDCB#TRPBF
- Part No.:
- LTC3459EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3459EDCB#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 60MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,277
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Product details
Overview
LTC3459EDCB#TRPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous boost converter IC designed for low-current, size-constrained portable systems. It operates from 1.5V to 5.5V input, delivers programmable output voltage from 2.5V to 10V, achieves >85% efficiency across wide load range (0.01–100mA), and features ultralow quiescent current (10μA) and shutdown current (<1μA). It is used in LCD bias generation and supercapacitor charging where compact footprint and battery longevity are critical.
For engineers reviewing the LTC3459EDCB#TRPBF datasheet, LTC3459EDCB#TRPBF pinout, LTC3459EDCB#TRPBF application, or LTC3459EDCB#TRPBF equivalent, key selection criteria include its 2mm × 3mm DFN package with exposed pad, Burst Mode® operation for light-load efficiency, internal N- and P-channel MOSFETs (RDS(ON) = 2.8Ω / 4.2Ω at VOUT = 5V), inrush current limiting during startup, and output disconnect in shutdown.
Technical Context
The LTC3459EDCB#TRPBF employs a fixed-frequency Burst Mode® control architecture with peak current sensing (75mA typical) and zero-current detection to maintain regulation while minimizing switching losses at light loads. Its tOFF timer dynamically adjusts based on (VOUT – VIN) to sustain continuous inductor current during burst packets, improving output current capability.
It integrates both main NMOS and PMOS power switches with verified RDS(ON) values, uses a 1.22V internal reference for feedback accuracy (±2.5%), and supports operation with VOUT < VIN via synchronous rectifier body-diode conduction-enabling regulated buck-like behavior during supercap charging from fresh batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 5.5V - supports single Li-ion, 2–3 alkaline/NiMH cells, or low-impedance sources without external regulators. |
| Output Voltage Range | 2.5V to 10V - set externally via resistor divider; enables flexible biasing for OLED, LCD, or sensor rails. |
| Peak Switch Current | 75mA typical - limits inductor stress and thermal rise; enables use of small 15–33μH ferrite inductors. |
| Quiescent Current | 10μA - minimizes battery drain in always-on portable devices with intermittent load demand. |
| Shutdown Current | <1μA - ensures near-zero standby leakage; critical for long-term backup power applications. |
| Feedback Reference | 1.22V ±2.5% - defines output accuracy; allows precise VOUT setting with standard 1% resistors. |
| Switching Frequency | ~2MHz - enables compact passive components (e.g., 22μH inductor, 4.7μF ceramic output cap). |
Pinout & Package
The LTC3459EDCB#TRPBF is housed in a 6-pin, 2mm × 3mm plastic DFN package with exposed thermal pad (Pin 7) soldered to PCB ground for enhanced thermal performance (θJA = 64°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 6) | Input supply connection | Battery or source input; requires ≥1μF low-ESR ceramic bypass capacitor close to pin. |
| VOUT (Pin 5) | Regulated output node | Delivers programmed boost voltage; must be bypassed with 2.2–10μF X5R ceramic capacitor. |
| SHDN (Pin 1) | Enable/disable control | Logic-high (>1V) enables operation; logic-low disables all functions and reduces IQ to <1μA. |
| FB (Pin 3) | Feedback input | Connects to resistor divider; sets VOUT = 1.22V × (1 + R1/R2); input leakage ≤50nA preserves accuracy. |
| GND (Pin 2) | Signal and power ground | Common return for VIN, VOUT, and internal circuitry; must tie directly to exposed pad and filter caps. |
| SW (Pin 4) | Power switch node | Drives external inductor; high dv/dt requires short, wide PCB trace to minimize EMI and overshoot. |
| Exposed Pad (Pin 7) | Thermal and electrical ground | Must be soldered to large PCB copper area; improves thermal dissipation and reduces θJA. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N- and P-channel MOSFETs eliminate external Schottky diode, reducing component count and improving efficiency at medium loads. |
| Burst Mode® operation | Reduces switching activity at light loads, maintaining >85% efficiency down to 10μA output current without audible noise. |
| Inrush current limiting | Controls inductor current during startup to prevent surge into output capacitors-critical for reliable supercap charging. |
| Output disconnect in shutdown | Isolates VOUT from VIN when disabled, preventing backfeed and preserving input source integrity. |
| Wide input-to-output regulation | Maintains regulation even when VOUT < VIN (e.g., 3.3V out from 5V input), enabling hybrid buck-boost functionality in one IC. |
Applications
| LCD Bias Generation | OLED Display Power |
|---|---|
Use Scenario: Generating stable 8–10V bias rails for segment drivers in monochrome or color STN/TFT LCD modules powered by 3.3V or dual-AA supplies. IC Role / Device Role / Timing Role: Primary DC/DC boost regulator providing regulated high-voltage rail with minimal ripple and fast transient response. Use Value: Enables compact, low-noise display power with <10μA quiescent draw-extending battery life in handheld medical or industrial displays. | Use Scenario: Supplying 3.3V or 5V anode/cathode rails for small-format OLED panels in wearables or smart sensors operating from coin-cell or Li-ion sources. IC Role / Device Role / Timing Role: Micropower boost controller delivering precise, low-ripple output with programmable voltage and soft-start behavior. Use Value: Supports true black-level contrast and uniform pixel brightness while consuming <10μA in standby-critical for always-on UI elements. |
| Supercapacitor Charging | Digital Camera Backlight |
Use Scenario: Charging 1–2F 5V supercapacitors from 3.3V system rails to provide backup power for real-time clocks or SRAM retention during main power loss. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger using peak current control and VOUT regulation below VIN during initial charge phase. Use Value: Prevents damaging inrush by limiting peak inductor current to 75mA; maintains safe die temperature (<125°C) during 100–200mW dissipation. | Use Scenario: Driving white LED backlight strings requiring 5V–8V from 3.3V logic rails in compact digital cameras or camcorders with alkaline battery inputs. IC Role / Device Role / Timing Role: High-efficiency boost converter supplying regulated LED driver input with tight line/load regulation. Use Value: Delivers >85% efficiency at 20–30mA loads while occupying <12mm² PCB area-enabling slim form factors without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3400EDC#TRPBF | Higher peak current (600mA), fixed 5V output, no programmable VOUT, higher IQ (19μA), same 2mm × 2mm DFN package. | Best for fixed 5V loads needing higher current; unsuitable for adjustable bias or supercap charging above 5V. | Select LTC3459EDCB#TRPBF when programmable output up to 10V, ultralow IQ (10μA), or VOUT < VIN regulation is required. |
| LT1613CS6#TRMPBF | Higher ISW (550mA), wider VIN (0.9–10V), no integrated PMOS, requires external Schottky, higher IQ (3mA), SOT-23-6 package. | Preferred for ultra-low-VIN applications (e.g., single NiMH cell); lacks output disconnect and synchronous rectification. | Choose LTC3459EDCB#TRPBF for integrated synchronous design, output isolation, and sub-1μA shutdown in space-constrained layouts. |
Compared with LTC3400EDC#TRPBF and LT1613CS6#TRMPBF, the LTC3459EDCB#TRPBF uniquely combines programmable 2.5–10V output, ultralow 10μA quiescent current, integrated synchronous switches, and regulated operation below VIN-making it optimal for precision bias and energy-harvesting-adjacent backup power designs.
Availability
LTC3459EDCB#TRPBF is available at Aetrix Electronics and suitable for LCD bias generation, OLED display power, supercapacitor charging, and digital camera backlight applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3459EDCB#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3459 belongs to Linear's micropower DC/DC converter product line, engineered specifically for ultra-low-power portable electronics where battery life, solution size, and regulated output flexibility outweigh raw current capability.
FAQ
What is the maximum output voltage supported by the LTC3459EDCB#TRPBF?
The LTC3459EDCB#TRPBF supports a programmable output voltage range from 2.5V to 10V, set externally via a resistor divider connected to the FB pin. The internal 1.22V reference and ±2.5% accuracy ensure stable regulation across this full range under specified load and temperature conditions.
Does the LTC3459EDCB#TRPBF support operation when VOUT is less than VIN?
Yes, the LTC3459EDCB#TRPBF maintains regulation even when VOUT is less than VIN (e.g., 3.3V output from a 5V input) by leveraging the body diode of its internal P-channel MOSFET. In this mode, efficiency decreases but controlled current delivery remains intact-enabling use in supercapacitor charging and hybrid buck-boost scenarios.
What package type does the LTC3459EDCB#TRPBF use, and is thermal pad connection mandatory?
The LTC3459EDCB#TRPBF uses a 6-pin, 2mm × 3mm plastic DFN package (DCB) with an exposed thermal pad (Pin 7). This pad must be soldered to a PCB ground plane to achieve the specified θJA of 64°C/W and prevent thermal shutdown during sustained 75mA peak current operation.
How does Burst Mode® operation improve efficiency at light loads in the LTC3459EDCB#TRPBF?
Burst Mode® operation in the LTC3459EDCB#TRPBF reduces switching frequency and gate drive activity during light loads, drawing only 10μA quiescent current while maintaining output regulation. This eliminates switching losses dominant at low currents, sustaining >85% efficiency from 10μA to 100mA-unlike fixed-frequency converters that suffer steep efficiency roll-off.
Can the LTC3459EDCB#TRPBF safely charge a 2F supercapacitor from a 3.3V source?
Yes, the LTC3459EDCB#TRPBF is explicitly validated for supercapacitor charging, including 2F units at 5V. Its inrush current limiting, peak current control (75mA typical), and VOUT regulation below VIN enable safe, controlled charging. Proper thermal design-including exposed pad soldering-is required to manage up to 200mW dissipation during initial charge phases.
LTC3459EDCB#TRPBF 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
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 10V (Switch)
- Current - Output:
- 60mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3459EDCB#TRPBF FAQ
1.How can I place an order for LTC3459EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3459EDCB#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 LTC3459EDCB#TRPBF reliable?
The price and inventory of LTC3459EDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3459EDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3459EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3459EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3459EDCB#TRPBF?
LTC3459EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3459EDCB#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 LTC3459EDCB#TRPBF?
For technical support, including LTC3459EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3459EDCB#TRPBF requirements.
6.How does Aetrix verify that LTC3459EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3459EDCB#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 LTC3459EDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3459EDCB#TRPBF?
All LTC3459EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3459EDCB#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 LTC3459EDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3459EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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