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Analog Devices Inc. LTC3459EDCB#TRMPBF
- Part No.:
- LTC3459EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3459EDCB#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 60MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC3459EDCB#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous boost converter IC designed for low-current, size-constrained portable power rails. It operates from 1.5V to 5.5V input, delivers programmable output from 2.5V to 10V, achieves >85% efficiency across load currents from 0.01mA to 30mA, and features Burst Mode® operation with <1μA shutdown current. It is used in LCD bias generation and supercapacitor charging circuits.
For engineers reviewing the LTC3459EDCB#TRMPBF datasheet, LTC3459EDCB#TRMPBF pinout, LTC3459EDCB#TRMPBF application, or LTC3459EDCB#TRMPBF equivalent, key selection criteria include ultralow quiescent current (10μA), internal synchronous N- and P-channel MOSFETs, inrush-limited start-up, output disconnect in shutdown, and compatibility with 2mm × 3mm DFN packaging for compact battery-powered designs.
Technical Context
The LTC3459EDCB#TRMPBF employs a fixed-peak-current Burst Mode® control architecture with zero-current detection and a voltage-proportional tOFF timer (225–550ns), enabling high efficiency down to microamp loads. Its dual-MOSFET synchronous rectification eliminates external diode requirements and supports regulated output even when VOUT < VIN, albeit at reduced efficiency.
It integrates a 1.22V reference with ±2.5% accuracy, FB input leakage ≤50nA, and logic-level SHDN with 0.3V–1V rising-edge threshold and 80mV hysteresis. Thermal protection activates above 125°C junction temperature, and the exposed pad must be soldered to PCB ground for thermal and electrical integrity.
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 regulation. |
| Output Voltage Range | 2.5V to 10V - set externally via resistor divider; enables flexible biasing for OLED, LCD, or memory backup rails. |
| Quiescent Current | 10μA - minimizes battery drain in always-on sensor or real-time clock subsystems. |
| Shutdown Current | <1μA - ensures negligible standby loss during system sleep or storage modes. |
| Peak Switch Current | 60–90mA - defines maximum deliverable output current with 22μH inductor and typical layout. |
| Feedback Reference | 1.22V ±2.5% - sets output accuracy; determines R1/R2 ratio for precise VOUT programming. |
| Switching Frequency | ~2MHz - allows use of small, low-profile 15–33μH inductors and ceramic capacitors. |
| Package | 6-pin 2mm × 3mm plastic DFN with exposed GND pad - provides low θJA = 64°C/W and minimal PCB footprint. |
Pinout & Package
Package: 6-lead plastic DFN (2mm × 3mm), exposed pad (Pin 7) tied to GND. Requires soldering of exposed pad for thermal performance and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 6) | Input supply connection | Bypass with ≥1μF low-ESR ceramic capacitor; supplies power to internal circuitry and switch driver. |
| VOUT (Pin 5) | Regulated output node | Delivers programmed boost voltage; requires 2.2–10μF ceramic output capacitor for ripple control and stability. |
| SHDN (Pin 1) | Enable/disable control input | Pulled high (>1V) to enable; driven low to reduce total current draw to <1μA and disconnect VOUT from VIN. |
| FB (Pin 3) | Feedback input to error amplifier | Connects to resistor divider from VOUT to GND; sets output as VOUT = 1.22V × (1 + R1/R2). |
| GND (Pin 2) | Signal and power ground reference | Must have short, low-inductance PCB path to both input and output capacitor negatives. |
| SW (Pin 4) | Internal switch node | Drives external inductor; connects to internal N- and P-channel MOSFETs; requires short, wide trace to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N- and P-channel MOSFETs eliminate external Schottky diode, reducing component count and improving light-load efficiency. |
| Burst Mode® operation | Enables >85% efficiency from 10μA to 30mA load by pulsing switching only when output droops below regulation threshold. |
| Inrush current limiting | Peak inductor current is controlled during start-up, preventing surge currents that could brown-out weak batteries or trip protection circuits. |
| Output disconnect in shutdown | VOUT is actively isolated from VIN during SHDN assertion, eliminating reverse leakage paths and preserving source battery life. |
| Ultralow quiescent current | 10μA operating current allows multi-year operation from coin cells in maintenance-free IoT sensors or RTC backup systems. |
Applications
| LCD Bias Generation | OLED Display Power |
|---|---|
Use Scenario: Generating stable 8V–10V bias for TFT-LCD gate drivers in handheld medical monitors. IC Role / Device Role / Timing Role: Primary boost regulator delivering regulated high-voltage rail from 3.3V system bus. Use Value: Eliminates need for discrete diode-based charge pumps; achieves 89% efficiency at 10mA load with <50mVPP ripple using 4.7μF output cap. |
Use Scenario: Supplying 5V anode bias to small monochrome OLED modules in wearable fitness trackers. IC Role / Device Role / Timing Role: Micropower DC/DC converter powering display subsystem during intermittent wake cycles. Use Value: Draws only 10μA quiescent current between updates, extending CR2032 battery life beyond 18 months at 1Hz refresh rate. |
| Supercapacitor Charging | Digital Camera Flash Support |
Use Scenario: Charging a 2F/5V Maxwell Ultracap PC5-5 from 3.3V MCU rail for backup power in data loggers. IC Role / Device Role / Timing Role: Constant-current charger with peak current control and VOUT regulation below VIN during initial ramp. Use Value: Limits inrush to ~50mA average, prevents thermal stress on IC and supercap; completes 0–5V charge in <120 seconds. |
Use Scenario: Providing 5V auxiliary rail for white LED flash drivers in compact digital cameras powered by AA alkaline cells. IC Role / Device Role / Timing Role: Boost converter supplying burst-mode flash current while maintaining main system voltage stability. Use Value: Delivers 30mA at 5V from 1.8V–3V input with >82% efficiency; output disconnect prevents flash circuit from loading battery during idle. |
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#TRMPBF | Higher peak switch current (600mA), wider input range (0.5V–5V), but higher quiescent current (19μA) and no VOUT < VIN regulation. | Targeted at higher-current 3.3V/5V boost needs (e.g., USB peripherals); unsuitable for sub-100mA ultra-low-power or supercap charging roles. | Select LTC3459EDCB#TRMPBF when ultralow IQ (<10μA), inrush limiting, and VOUT regulation below VIN are required. |
| LT1613CS6#TRMPBF | 550mA ISW, 1.4MHz switching, 3mA quiescent current, but lacks output disconnect and synchronous rectification. | Used where higher output current is needed and external Schottky diode is acceptable; less efficient below 1mA load due to diode drop. | Choose LTC3459EDCB#TRMPBF for battery-sensitive applications requiring <1μA shutdown and integrated MOSFETs. |
Compared with LTC3400EDC#TRMPBF and LT1613CS6#TRMPBF, the LTC3459EDCB#TRMPBF offers uniquely low quiescent current, inrush-limited start-up, and true output disconnect-making it optimal for long-life, low-duty-cycle portable devices where every microamp counts.
Availability
LTC3459EDCB#TRMPBF is available at Aetrix Electronics and suitable for LCD bias generation, OLED display power, supercapacitor charging, and digital camera flash support requiring stable component supply and long-term manufacturability.
Supply support for LTC3459EDCB#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 pioneered high-efficiency, low-quiescent-current DC/DC converters for portable electronics.
The LTC3459EDCB#TRMPBF belongs to Linear's micropower synchronous boost converter family, engineered specifically for battery-powered applications demanding minimal standby loss, compact solution size, and reliable start-up under weak-source conditions.
FAQ
What is the minimum input voltage required for LTC3459EDCB#TRMPBF to regulate a 5V output?
The LTC3459EDCB#TRMPBF can regulate 5V output down to 1.5V input, as specified in its absolute input voltage range. However, practical regulation with adequate headroom and efficiency begins at ~2.0V input; below this, duty cycle approaches 100% and efficiency drops significantly. The device remains functional and maintains regulation even when VOUT exceeds VIN, which is intrinsic to boost topology.
Does LTC3459EDCB#TRMPBF require an external Schottky diode?
No, the LTC3459EDCB#TRMPBF does not require an external Schottky diode. It integrates both N-channel and P-channel MOSFETs for synchronous rectification, eliminating conduction losses and thermal concerns associated with discrete diodes. This integration reduces bill-of-materials cost and improves light-load efficiency compared to diode-based boost solutions.
How is output voltage programmed on LTC3459EDCB#TRMPBF?
Output voltage on the LTC3459EDCB#TRMPBF is programmed using an external resistor divider connected between VOUT, FB, and GND. The formula is VOUT = 1.22V × (1 + R1/R2), where R1 connects VOUT to FB and R2 connects FB to GND. The feedback reference voltage is trimmed to ±2.5% accuracy over temperature, ensuring stable output across operating conditions.
What thermal considerations apply to LTC3459EDCB#TRMPBF in supercapacitor charging applications?
In supercapacitor charging, the LTC3459EDCB#TRMPBF may dissipate 100–200mW during initial constant-current phase, especially when VOUT < VIN. Its 2mm × 3mm DFN package has θJA = 64°C/W; therefore, adequate copper area on the exposed pad and surrounding GND plane is essential to maintain junction temperature below 125°C. Thermal derating is recommended above 60°C ambient.
Can LTC3459EDCB#TRMPBF operate with input voltages above 5.5V?
No, LTC3459EDCB#TRMPBF must not be operated with input voltages exceeding 5.5V. Its absolute maximum VIN rating is 7V, but continuous operation above 5.5V violates the specified operating range and risks parametric shift or premature failure. For inputs up to 12V, consider alternatives like LT1613 or LT1949, which are rated for higher VIN.
LTC3459EDCB#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
- 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#TRMPBF FAQ
1.How can I place an order for LTC3459EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3459EDCB#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 LTC3459EDCB#TRMPBF reliable?
The price and inventory of LTC3459EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3459EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3459EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3459EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3459EDCB#TRMPBF?
LTC3459EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3459EDCB#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 LTC3459EDCB#TRMPBF?
For technical support, including LTC3459EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3459EDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC3459EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3459EDCB#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 LTC3459EDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3459EDCB#TRMPBF?
All LTC3459EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3459EDCB#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 LTC3459EDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3459EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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