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Analog Devices Inc. LTC3539EDCB-2#TRPBF
- Part No.:
- LTC3539EDCB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3539EDCB-2#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,433
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Product details
Overview
LTC3539EDCB-2#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous 2A step-up DC/DC converter with output disconnect, fixed 2MHz switching frequency, 700mV start-up voltage, and operation down to 500mV after startup. It delivers up to 900mA at 5V from a single Li-Po cell and supports adjustable output from 1.5V to 5.25V in a low-profile 2mm × 3mm DFN package.
For engineers reviewing the LTC3539EDCB-2#TRPBF datasheet, LTC3539EDCB-2#TRPBF pinout, LTC3539EDCB-2#TRPBF application, or LTC3539EDCB-2#TRPBF equivalent, key selection criteria include ultra-low-voltage start-up capability, Burst Mode® efficiency optimization at light loads, output disconnect for true shutdown isolation, and compatibility with compact 2MHz magnetics.
Technical Context
The LTC3539EDCB-2#TRPBF employs current-mode PWM control with internal slope compensation and adaptive peak-current limiting (2.6A typical), enabling stable regulation across wide input/output differentials. Its architecture integrates an N-channel MOSFET switch (90mΩ RDS(ON)) and P-channel synchronous rectifier (125mΩ RDS(ON)), supporting VIN > VOUT operation while maintaining ≥94% peak efficiency.
Startup is managed by a dedicated oscillator that initiates switching at 700mV input, after which the IC self-powers from VOUT once VOUT exceeds VIN by 240mV. The 2MHz fixed-frequency operation minimizes external component size, and anti-ringing circuitry damps SW-pin oscillation during discontinuous conduction mode to reduce EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2MHz fixed - enables use of sub-2.5µH inductors and 0603/0805 ceramic capacitors, reducing solution footprint. |
| Input Voltage Range | 0.5V to 5V - supports single-cell alkaline/NiMH (0.5V operational), Li-Po (2.7–4.2V), and VIN > VOUT configurations. |
| Output Voltage Range | 1.5V to 5.25V - programmable via resistor divider on FB pin; feedback reference is 1.200V ±1.5%. |
| Peak Switch Current Limit | 2.6A typical - provides robust overload protection; reduced to 1.4A under short-circuit conditions. |
| Quiescent Current (Burst Mode) | 10µA - sustains battery life in always-on portable devices with intermittent load demand. |
| Shutdown Current | <1µA - ensures near-zero drain during system sleep; SHDN pin has internal 4MΩ pull-down. |
| Start-Up Voltage | 700mV typical - allows operation from deeply discharged batteries or energy-harvesting sources. |
Pinout & Package
The LTC3539EDCB-2#TRPBF is housed in an 8-lead, 2mm × 3mm × 0.75mm plastic DFN package (DCB) with exposed thermal pad (Pin 9) that must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internal N-MOSFET drain; anti-ring resistor engages during DCM to suppress EMI. |
| PGND (Pin 2) | Power ground | Low-impedance return path for high di/dt switch current; must tie directly to input/output capacitor negatives. |
| GND (Pin 3) | Signal ground | Reference for FB, MODE, SHDN; requires short, low-inductance trace to PGND and exposed pad. |
| VIN (Pin 4) | Battery input | Accepts 0.5–5V; requires ≥2.2µF ceramic decoupling close to pin; powers IC until VOUT > VIN + 240mV. |
| SHDN (Pin 5) | Logic shutdown control | Active-high; >0.88V = enable, <0.3V = shutdown (<1µA IQ); tolerates voltage above VIN/VOUT. |
| FB (Pin 6) | Feedback input | Senses resistor divider output; regulates VOUT = 1.2V × (1 + R2/R1); input bias current ≤50nA. |
| MODE (Pin 7) | Operation mode select | High = automatic Burst Mode®, Low = forced PWM; controls light-load efficiency vs. ripple trade-off. |
| VOUT (Pin 8) | Regulated output / sync rectifier drain | Delivers regulated output; internal P-MOSFET source; short, wide trace required to output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Output Disconnect | Eliminates body-diode conduction in shutdown - VOUT drops fully to 0V with zero reverse current into VIN source. |
| 2MHz Fixed-Frequency Operation | Reduces inductor size to ≤2.5µH and enables compact 0603/0805 ceramic capacitors without compromising stability. |
| 700mV Start-Up Voltage | Enables power-up from single-cell alkaline/NiMH at end-of-life or ultra-low-power energy harvesting systems. |
| Internal Compensation | Removes need for external loop compensation components - only 6 external parts required for full implementation. |
| Burst Mode® Efficiency Optimization | Maintains ≥85% efficiency at 100µA load via periodic energy bursts and 10µA sleep-state quiescent current. |
Applications
| Portable Bar Code Scanners | Noise Canceling Headphones |
|---|---|
Use Scenario: Battery-powered handheld scanner requiring 5V rail for laser diode and imager, operating from single Li-Po cell (2.7–4.2V). IC Role / Device Role / Timing Role: Primary 5V step-up regulator with output disconnect to prevent battery drain during idle. Use Value: 2MHz switching enables miniature 2.2µH inductor and 22µF ceramic output cap; 700mV start-up extends usable battery range by ~15%. |
Use Scenario: Active noise cancellation circuitry in premium headphones needing clean, low-noise 3.3V supply from 1.5V alkaline cells. IC Role / Device Role / Timing Role: Synchronous boost converter delivering regulated 3.3V with Burst Mode® to minimize standby current. Use Value: 10µA Burst Mode quiescent current extends shelf life; output disconnect prevents battery leakage when powered off. |
| Portable GPS Navigation | Handheld PCs |
Use Scenario: GPS module requiring stable 3.3V supply from two NiMH cells (1.2–2.4V), with cold-start capability at low temperature. IC Role / Device Role / Timing Role: High-efficiency step-up regulator supporting wide input range and low-temperature start-up. Use Value: 700mV start-up voltage ensures reliable cold-boot down to –40°C; 94% peak efficiency preserves runtime during signal acquisition bursts. |
Use Scenario: Embedded computing platform needing 5V rail for USB peripherals and display backlight, powered by single Li-Po cell. IC Role / Device Role / Timing Role: Compact, high-current boost converter with thermal shutdown and short-circuit protection. Use Value: 2A current limit and thermal shutdown (160°C) protect against sustained overloads; 2mm × 3mm DFN saves board space in thin form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3422EDE#TRPBF | 3MHz switching, 1.5A output, 3mm × 3mm DFN, 500mV start-up | Higher frequency but lower current; no output disconnect; less suitable for 5V@900mA Li-Po apps | Select LTC3539EDCB-2#TRPBF for higher output current and guaranteed output disconnect in battery-isolation-critical designs. |
| LTC3424EDD#TRPBF | 3MHz switching, 2A output, 10-lead MSOP, 500mV start-up, no output disconnect | Same current rating but larger package; lacks output disconnect and 2MHz option; higher EMI risk without anti-ring circuitry | Choose LTC3539EDCB-2#TRPBF when board space is constrained and true output isolation is required for system-level power sequencing. |
Compared with LTC3422EDE#TRPBF and LTC3424EDD#TRPBF, the LTC3539EDCB-2#TRPBF uniquely combines 2A capability, 2MHz operation, output disconnect, and 700mV start-up in a 2mm × 3mm DFN-enabling smaller total solution size and superior battery management in portable Li-Po and multi-cell alkaline systems.
Availability
LTC3539EDCB-2#TRPBF is available at Aetrix Electronics and suitable for portable bar code scanners, noise-canceling headphones, portable GPS navigation, and handheld PCs requiring stable component supply with long-term lifecycle support.
Supply support for LTC3539EDCB-2#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 and maintains its precision analog and power management product lines with full technical documentation and long-term manufacturing commitment.
The LTC3539 series was designed specifically for ultra-low-voltage, high-efficiency boost conversion in space-constrained portable electronics - emphasizing start-up reliability, light-load efficiency, and seamless integration with single-cell battery sources.
FAQ
What is the minimum input voltage required to start up the LTC3539EDCB-2#TRPBF?
The LTC3539EDCB-2#TRPBF starts up at a typical input voltage of 700mV, with guaranteed operation down to 0.7V across temperature. Once started, it continues operating down to 500mV input. This capability is enabled by a dedicated start-up oscillator and internal charge pump, making LTC3539EDCB-2#TRPBF suitable for deeply discharged batteries and energy-harvesting applications where input voltage may dip below 1V.
Does the LTC3539EDCB-2#TRPBF support output voltages higher than 5V?
No, the LTC3539EDCB-2#TRPBF supports an adjustable output voltage range of 1.5V to 5.25V only, as defined by its internal 1.200V ±1.5% feedback reference and maximum duty cycle limit (~90%). Attempting to set VOUT above 5.25V violates the device's electrical specifications and may result in regulation failure or instability. For higher output voltages, consider alternatives like LTC3421 or LTC3423.
How does the output disconnect feature work in the LTC3539EDCB-2#TRPBF?
The LTC3539EDCB-2#TRPBF achieves true output disconnect by actively controlling its internal P-channel synchronous rectifier to prevent body-diode conduction during shutdown. When SHDN is pulled low, VOUT discharges to 0V with no reverse current flow into VIN - eliminating battery drain and enabling safe hot-swap or power sequencing. This behavior requires no external Schottky diode; adding one defeats the disconnect function.
Can the LTC3539EDCB-2#TRPBF operate with input voltage greater than output voltage?
Yes, the LTC3539EDCB-2#TRPBF supports VIN > VOUT operation, maintaining regulation even when input exceeds programmed output (e.g., 4.2V Li-Po feeding 3.3V rail). However, efficiency and maximum output current decrease in this mode due to reduced duty cycle headroom and increased conduction losses. The device remains functional and protected, but optimal performance occurs when VIN < VOUT.
What is the difference between the LTC3539EDCB-2#TRPBF and the standard LTC3539EDCB#TRPBF?
The LTC3539EDCB-2#TRPBF is identical to the LTC3539EDCB#TRPBF in pinout, package, features, and electrical specifications except for switching frequency: LTC3539EDCB-2#TRPBF operates at a fixed 2MHz, whereas LTC3539EDCB#TRPBF runs at 1MHz. This difference dictates inductor selection (1.5–2.5µH for -2 vs. 3.3–4.7µH for base part) and impacts EMI profile, solution size, and light-load Burst Mode threshold behavior.
LTC3539EDCB-2#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
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.5V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
LTC3539EDCB-2#TRPBF FAQ
1.How can I place an order for LTC3539EDCB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3539EDCB-2#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 LTC3539EDCB-2#TRPBF reliable?
The price and inventory of LTC3539EDCB-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3539EDCB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3539EDCB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3539EDCB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3539EDCB-2#TRPBF?
LTC3539EDCB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3539EDCB-2#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 LTC3539EDCB-2#TRPBF?
For technical support, including LTC3539EDCB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3539EDCB-2#TRPBF requirements.
6.How does Aetrix verify that LTC3539EDCB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3539EDCB-2#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 LTC3539EDCB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3539EDCB-2#TRPBF?
All LTC3539EDCB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3539EDCB-2#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 LTC3539EDCB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3539EDCB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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