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Analog Devices Inc. LTC3539EDCB-2#TRMPBF
- Part No.:
- LTC3539EDCB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3539EDCB-2#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,184
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Product details
Overview
LTC3539EDCB-2#TRMPBF from Analog Devices (formerly Linear Technology) is a 2A, 2MHz synchronous step-up DC/DC converter with output disconnect, designed for ultra-low-voltage battery-powered systems. It starts up from 700mV, operates down to 500mV after startup, delivers up to 5.25V output across 1.5–5.25V range, and achieves up to 94% efficiency in a 2mm × 3mm DFN package - enabling compact 3.3V/5V regulation from single-cell alkaline, NiMH, or Li-Po sources.
For engineers reviewing the LTC3539EDCB-2#TRMPBF datasheet, LTC3539EDCB-2#TRMPBF pinout, LTC3539EDCB-2#TRMPBF application, or LTC3539EDCB-2#TRMPBF equivalent, key selection criteria include its 2MHz fixed-frequency operation (vs. 1MHz LTC3539), 10µA Burst Mode quiescent current, ±1.5% feedback voltage tolerance, output disconnect capability, and compatibility with low-profile 2.2µH inductors for space-constrained portable designs.
Technical Context
The LTC3539EDCB-2#TRMPBF implements current-mode PWM control with internal slope compensation and adaptive peak-current limiting (2.6A typical), enabling fast transient response and stable regulation across wide input/output ratios. Its architecture integrates an N-channel main switch (90mΩ RDS(ON)) and P-channel synchronous rectifier (125mΩ RDS(ON)), both optimized for high efficiency at light and heavy loads.
Burst Mode® operation is enabled via the MODE pin and reduces quiescent current to 10µA while maintaining regulation; anti-ringing circuitry damps SW-pin oscillation during discontinuous conduction mode to suppress EMI. The device features true output disconnect, thermal shutdown (160°C), and internal soft-start (0.5ms ramp), all implemented without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2MHz fixed - enables use of sub-3µH inductors and 0402/0603 ceramic capacitors, minimizing solution footprint. |
| Input Voltage Range | 0.5V to 5V after startup; 0.7V minimum start-up - supports single-cell alkaline/NiMH (0.9–1.6V) and Li-Po (3.0–4.5V) inputs. |
| Output Voltage Range | 1.5V to 5.25V adjustable via resistor divider - covers standard logic rails (1.8V, 3.3V, 5V) with ±1.5% FB voltage tolerance. |
| Peak Switch Current Limit | 2.6A typical - sustains 900mA output at 3.3V from 2× alkaline cells or 750mA at 5V from Li-Po with margin. |
| Quiescent Current (Burst Mode) | 10µA - extends battery life in standby or sensor-monitoring modes where load averages <1mA. |
| Output Disconnect | True VOUT = 0V shutdown - eliminates reverse leakage through body diode, prevents battery drain, and enables VIN > VOUT operation. |
| Package | 8-lead 2mm × 3mm × 0.75mm DFN with exposed pad - requires soldered GND pad for thermal management (θJA = 64°C/W). |
Pinout & Package
Package: 8-lead plastic DFN (2mm × 3mm × 0.75mm), exposed pad (Pin 9) must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace to minimize EMI and voltage spikes. |
| PGND (Pin 2) | Power ground | Low-impedance return path for inductor current and internal N-MOSFET source - must tie directly to input/output capacitor (–) terminals. |
| GND (Pin 3) | Signal ground | Reference for FB, MODE, SHDN comparators - routed separately from PGND but joined at single point near exposed pad. |
| VIN (Pin 4) | Input supply | Accepts 0.5–5V; requires ≥2.2µF ceramic decoupling close to pin to stabilize low-VIN start-up and reduce ripple. |
| SHDN (Pin 5) | Shutdown control | Logic-high (>0.88V) enables operation; logic-low (<0.3V) disables switching and reduces IQ to <1µA - internal 4MΩ pull-down. |
| FB (Pin 6) | Feedback input | Senses resistive divider output; regulates VOUT = 1.2V × (1 + R2/R1); input bias current ≤50nA minimizes divider error. |
| MODE (Pin 7) | Operating mode select | High (>0.88V): automatic Burst Mode; Low (<0.3V): forced PWM - no external pull-up/down required. |
| VOUT (Pin 8) | Regulated output / sync rectifier drain | Delivers regulated voltage; connects to output capacitor - trace must be short/wide to minimize ESR-induced ripple and noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| 2MHz fixed-frequency operation | Enables use of 1.5–2.5µH inductors and 0603/0805 ceramic capacitors, reducing total solution size by >30% vs. 1MHz alternatives. |
| 700mV start-up voltage | Allows reliable boot from nearly-dead single-cell batteries (e.g., 0.9V alkaline under load), extending usable battery life. |
| Output disconnect with zero reverse current | Eliminates VOUT hold-up and battery drain during shutdown - critical for medical sensors and always-on IoT endpoints. |
| Internal loop compensation | Reduces BOM count to only 6 external components (inductor, 2× caps, 2× resistors, feedforward cap) - accelerates design validation. |
| Anti-ringing circuitry | Damps SW-node resonance in discontinuous mode, lowering radiated EMI without adding snubbers or ferrite beads. |
Applications
| Medical Instruments | Portable Bar Code Scanners |
|---|---|
Use Scenario: Powering low-noise analog front-ends and microcontrollers in handheld glucose meters or pulse oximeters from single AA/AAA cells. IC Role / Device Role / Timing Role: Primary 3.3V/5V regulator with output disconnect ensuring zero standby current between measurements. Use Value: Extends battery life beyond 6 months per set using 0.7V start-up and 10µA Burst Mode current. |
Use Scenario: Supplying 5V to laser diodes and image sensors in pocket-sized barcode readers powered by two NiMH cells. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 750mA at 5V with minimal thermal rise in sealed plastic housing. Use Value: 2MHz switching allows compact 2.2µH inductor placement adjacent to sensor module, reducing board area by 25%. |
| Noise Canceling Headphones | Portable GPS Navigation |
Use Scenario: Generating clean 3.3V rail for DSP and ADC in battery-operated active noise cancellation earbuds. IC Role / Device Role / Timing Role: Low-EMI 2MHz boost stage with anti-ringing control preventing RF interference with Bluetooth audio link. Use Value: Achieves <1% peak-to-peak output ripple with 47µF X5R ceramic cap, eliminating audible switching artifacts. |
Use Scenario: Providing regulated 3.3V to GPS receiver ICs and RF front-ends in compact outdoor navigation devices using Li-Po battery. IC Role / Device Role / Timing Role: Wide-input (3.0–4.5V) boost converter supporting full battery voltage range without intermediate LDO loss. Use Value: Maintains >90% efficiency from 3.3V to 4.2V input, preserving runtime during extended satellite acquisition phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3539EDCB#TRMPBF | 1MHz switching frequency; higher inductor value (3.3–4.7µH) required; slightly lower light-load efficiency at 2.5V output | Better suited for 5V output from Li-Po where Burst Mode entry threshold is more predictable below 1.8V input | Select when 1MHz operation simplifies EMI filtering or when legacy layout uses larger inductors. |
| LTC3422EDE#TRMPBF | 3MHz switching; 1.5A current limit; 3mm × 3mm DFN; no output disconnect; 25µA Burst Mode IQ | Higher frequency enables smaller passives but lacks true output disconnect and has lower max current | Choose for ultra-compact 3.3V supplies where output disconnect is unnecessary and 1.5A suffices. |
Compared with LTC3539EDCB#TRMPBF and LTC3422EDE#TRMPBF, the LTC3539EDCB-2#TRMPBF uniquely balances 2MHz size reduction, 2A capability, and output disconnect - making it optimal for new portable designs requiring both high density and battery isolation.
Availability
LTC3539EDCB-2#TRMPBF is available at Aetrix Electronics and suitable for portable medical instruments, barcode scanners, noise-canceling headphones, and GPS navigation devices requiring stable component supply across long production lifecycles.
Supply support for LTC3539EDCB-2#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 with rigorous automotive and industrial qualification standards.
The LTC3539 family targets ultra-low-voltage, high-efficiency boost conversion in space- and battery-constrained portable electronics - emphasizing start-up reliability, EMI control, and seamless integration with single-cell chemistries.
FAQ
What is the minimum input voltage required for LTC3539EDCB-2#TRMPBF to start up?
The LTC3539EDCB-2#TRMPBF starts up from a minimum input voltage of 700mV (typical) with 1mA load and 0V output. Once started, it continues operating down to 500mV input. This capability enables reliable operation from nearly depleted single-cell alkaline or NiMH batteries, and is verified across –40°C to 85°C ambient temperature per the datasheet's Absolute Maximum Ratings table.
Does LTC3539EDCB-2#TRMPBF support output voltages above the input voltage (VIN > VOUT)?
Yes, the LTC3539EDCB-2#TRMPBF supports VIN > VOUT operation while maintaining regulation, as confirmed in the Applications Information section. However, efficiency and maximum output current decrease in this mode - for example, at VIN = 4.2V and VOUT = 3.3V, efficiency drops to ~85% at 500mA load per Typical Performance Characteristics Figure G03.
How does the MODE pin affect LTC3539EDCB-2#TRMPBF operation?
The MODE pin on LTC3539EDCB-2#TRMPBF selects between Burst Mode (MODE > 0.88V) and forced PWM (MODE < 0.3V). In Burst Mode, the device cycles between active switching and sleep (10µA IQ) to maximize light-load efficiency; in PWM mode, it pulses-skips at very low loads. The pin draws <1µA and requires no external bias.
What is the purpose of the exposed pad (Pin 9) on LTC3539EDCB-2#TRMPBF?
The exposed pad (Pin 9) on LTC3539EDCB-2#TRMPBF is electrically and thermally connected to GND. It must be soldered to the PCB ground plane to achieve the specified θJA = 64°C/W thermal resistance; failure to do so raises junction temperature significantly, risking thermal shutdown during 2A continuous operation per Package Description Note 6.
Can LTC3539EDCB-2#TRMPBF be used with ceramic output capacitors?
Yes, LTC3539EDCB-2#TRMPBF is optimized for ceramic output capacitors ≥22µF, as stated in the Output Capacitor Selection section. X5R or X7R dielectrics are recommended for stable capacitance across voltage and temperature; Y5V types are explicitly discouraged due to severe capacitance loss at bias.
LTC3539EDCB-2#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3539EDCB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3539EDCB-2#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 LTC3539EDCB-2#TRMPBF reliable?
The price and inventory of LTC3539EDCB-2#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3539EDCB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3539EDCB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3539EDCB-2#TRMPBF?
LTC3539EDCB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3539EDCB-2#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 LTC3539EDCB-2#TRMPBF?
For technical support, including LTC3539EDCB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3539EDCB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3539EDCB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3539EDCB-2#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 LTC3539EDCB-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3539EDCB-2#TRMPBF?
All LTC3539EDCB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3539EDCB-2#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 LTC3539EDCB-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3539EDCB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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