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Analog Devices Inc. LTC3539EDCB#TRPBF
- Part No.:
- LTC3539EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3539EDCB#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,489
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Product details
Overview
LTC3539EDCB#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous 2A step-up DC/DC converter with output disconnect, fixed 1MHz switching frequency, 700mV start-up voltage, and operation down to 500mV after startup. It delivers up to 900mA at 3.3V from two alkaline/NiMH cells and supports adjustable output from 1.5V to 5.25V - used in portable medical instruments and noise-canceling headphones.
For engineers reviewing the LTC3539EDCB#TRPBF datasheet, LTC3539EDCB#TRPBF pinout, LTC3539EDCB#TRPBF application, or LTC3539EDCB#TRPBF equivalent, key selection criteria include ultra-low-voltage start-up capability, integrated output disconnect for true shutdown isolation, Burst Mode® operation enabling 10µA quiescent current, and compatibility with tiny 2.2µH inductors due to 1MHz fixed-frequency PWM control.
Technical Context
The LTC3539EDCB#TRPBF employs current-mode PWM control with internal slope compensation and adaptive loop compensation, enabling stable regulation across wide input (0.5V–5V) and output (1.5V–5.25V) ranges without external compensation components. Its dual-MOSFET synchronous rectifier architecture integrates an N-channel switch (90mΩ RDS(ON)) and P-channel rectifier (125mΩ RDS(ON)) to minimize conduction loss.
Start-up is managed by a dedicated oscillator that initiates operation at 700mV input, then transitions to VOUT-powered operation once VOUT exceeds VIN by 240mV - eliminating dependency on large input capacitors. Anti-ringing circuitry actively damps SW-pin resonance during discontinuous conduction mode to suppress EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 1MHz - enables use of compact 2.2µH inductors and ceramic output capacitors ≥22µF. |
| Input Voltage Range | 0.5V to 5V after startup; 700mV minimum start-up voltage - supports single-cell alkaline, NiMH, and LiFePO₄ sources. |
| Output Voltage Range | Adjustable 1.5V to 5.25V via resistor divider - set by VOUT = 1.20V × (1 + R2/R1), with ±1.5% feedback reference tolerance. |
| Peak Switch Current Limit | 2.6A typical - provides robust overcurrent protection independent of input/output voltage under normal conditions. |
| Quiescent Current (Burst Mode) | 10µA - sustains ultra-low-power standby in battery-critical applications like handheld GPS and bar code scanners. |
| Efficiency | Up to 94% at 3.3V/600mA (VIN = 2.4V) - achieved via synchronous rectification and low RDS(ON) MOSFETs. |
| Shutdown Current | <1µA - ensures minimal battery drain during system sleep states. |
Pinout & Package
Package: 8-lead (2mm × 3mm × 0.75mm) DFN with exposed thermal pad (Pin 9), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internal anti-ring resistor engages during DCM to suppress EMI; must be routed short/wide. |
| PGND (Pin 2) & GND (Pin 3) | Power and signal ground | Separate ground paths reduce noise coupling; both require low-impedance connection to PCB ground plane and capacitor negatives. |
| VIN (Pin 4) | Battery input | Accepts 0.5V–5V; requires ≥2.2µF ceramic decoupling capacitor placed adjacent to pin. |
| SHDN (Pin 5) | Logic-controlled shutdown | Pulled low (<0.3V) to enter <1µA shutdown; internal 4MΩ pull-down enables default-off behavior. |
| FB (Pin 6) | Feedback input | Monitors resistive divider output; sets regulated VOUT; input bias current ≤50nA minimizes divider error. |
| MODE (Pin 7) | Burst Mode control | High (>0.88V) enables automatic light-load Burst Mode; low (<0.3V) forces continuous PWM operation. |
| VOUT (Pin 8) | Regulated output / rectifier drain | Serves as output sense point and synchronous rectifier drain; requires short/wide trace to output capacitor. |
| Exposed Pad (Pin 9) | Thermal and electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation (θJA = 64°C/W) and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Output disconnect | Eliminates body-diode conduction path - enables true zero-VOUT shutdown and prevents reverse current into VIN source. |
| Ultra-low start-up voltage | 700mV typical - allows operation from deeply discharged single-cell batteries without external charge pumps. |
| Integrated soft-start | Ramps peak inductor current from 0 to 2.6A in ~0.5ms - prevents inrush surges when powering heavy loads at turn-on. |
| Anti-ringing control | Active damping of SW-node resonance during DCM - reduces high-frequency EMI without external snubbers. |
| Thermal shutdown | Activates at 160°C junction temperature with 15°C hysteresis - protects against sustained overload or poor heatsinking. |
Applications
| Medical Instruments | Portable Bar Code Scanners |
|---|---|
|
Use Scenario: Powering low-noise analog front-ends and microcontrollers in handheld glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Primary 3.3V/5V boost regulator delivering regulated power from single AA/AAA cells. Use Value: 700mV start-up extends usable battery life by >25% compared to conventional boost ICs; output disconnect prevents battery leakage during device sleep. |
Use Scenario: Supplying laser diode drivers and decode processors in battery-operated retail scanners. IC Role / Device Role / Timing Role: High-efficiency 5V rail generator supporting intermittent high-current bursts during scan cycles. Use Value: 94% peak efficiency and 10µA Burst Mode current minimize average power draw - extending scan session duration per charge. |
| Noise Canceling Headphones | Portable GPS Navigation |
|
Use Scenario: Generating clean 3.3V supply for active noise cancellation (ANC) DSPs and analog audio circuits. IC Role / Device Role / Timing Role: Low-EMI boost converter operating in fixed-frequency PWM mode to avoid audible switching noise. Use Value: Anti-ringing control and 1MHz fixed frequency suppress sub-audible harmonics; 22µF ceramic output cap ensures <10mV ripple. |
Use Scenario: Providing stable 3.3V for GPS RF modules and baseband processors in compact outdoor navigation devices. IC Role / Device Role / Timing Role: Wide-input boost regulator supporting operation across lithium-polymer discharge curve (4.2V → 3.0V). Use Value: VIN > VOUT pass-through capability maintains regulation even when battery voltage exceeds 3.3V - simplifying power architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3402EDD#TRPBF | 3MHz switching, 2A rating, 0.5V min start-up, but no output disconnect or Burst Mode® | Lacks true output disconnect and low-noise Burst Mode - unsuitable where zero-VOUT shutdown or ultra-low IQ is required | Select LTC3539EDCB#TRPBF when output isolation, 10µA quiescent current, or 1MHz EMI profile are mandatory. |
| LTC3422EDD#TRPBF | 3MHz switching, 1.5A rating, 0.5V min start-up, includes output disconnect and Burst Mode®, 3mm×3mm DFN | Lower current capability (1.5A vs 2A) and higher minimum input (0.5V vs 0.7V start-up) - less suitable for marginal single-cell cases | Choose LTC3539EDCB#TRPBF for higher output current headroom and proven 700mV start-up margin in space-constrained designs. |
Compared with LTC3402EDD#TRPBF and LTC3422EDD#TRPBF, the LTC3539EDCB#TRPBF uniquely combines 2A capability, 700mV start-up, output disconnect, and 1MHz EMI control in a 2mm×3mm footprint - making it optimal for ultra-low-voltage, high-reliability portable systems requiring minimal board area.
Availability
LTC3539EDCB#TRPBF is available at Aetrix Electronics and suitable for portable medical instruments, noise-canceling headphones, handheld GPS navigation, and barcode scanning equipment requiring stable component supply across extended product lifecycles.
Supply support for LTC3539EDCB#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 portfolio with rigorous automotive-grade reliability testing and long-term product support.
The LTC3539EDCB#TRPBF belongs to Linear's high-efficiency synchronous boost converter family, designed specifically for space-constrained, battery-powered applications demanding ultra-low-voltage start-up, output isolation, and minimal quiescent power.
FAQ
What is the minimum input voltage required for LTC3539EDCB#TRPBF to start up?
The LTC3539EDCB#TRPBF has a guaranteed minimum start-up voltage of 700mV (typical), enabling reliable operation from nearly depleted single-cell alkaline or NiMH batteries. Once started, it continues regulating down to 500mV input. This specification is validated over –40°C to 85°C and is critical for maximizing battery utilization in portable medical and consumer devices using the LTC3539EDCB#TRPBF.
Does LTC3539EDCB#TRPBF support output voltages above the input voltage?
Yes, the LTC3539EDCB#TRPBF supports VIN > VOUT operation - maintaining regulation even when input voltage exceeds the programmed output (e.g., 4.2V Li-ion feeding a 3.3V rail). However, efficiency and maximum output current decrease in this mode. The LTC3539EDCB#TRPBF achieves this via internal power routing that switches from VIN to VOUT once VOUT exceeds VIN by 240mV, ensuring stable performance across the full battery discharge curve.
How does the MODE pin affect LTC3539EDCB#TRPBF operation?
The MODE pin on the LTC3539EDCB#TRPBF selects between two distinct operating modes: logic-high (>0.88V) enables automatic Burst Mode® for light loads (reducing IQ to 10µA), while logic-low (<0.3V) forces continuous fixed-frequency PWM operation. This pin directly controls the converter's efficiency-vs-noise trade-off - making the LTC3539EDCB#TRPBF adaptable to both ultra-low-power standby and low-EMI active modes without changing external components.
What is the purpose of the exposed pad (Pin 9) on LTC3539EDCB#TRPBF?
The exposed pad (Pin 9) on the LTC3539EDCB#TRPBF serves as both a thermal dissipation path and an additional ground connection. It must be soldered to the PCB ground plane to achieve the specified θJA of 64°C/W; failure to do so raises thermal resistance significantly, risking thermal shutdown under load. This pad also lowers EMI by providing a low-inductance return path - a requirement explicitly stated in the LTC3539EDCB#TRPBF datasheet layout guidelines.
Can LTC3539EDCB#TRPBF be used with ceramic output capacitors?
Yes, the LTC3539EDCB#TRPBF is internally compensated for stability with ceramic output capacitors ≥22µF, as confirmed in the datasheet's "Output and Input Capacitor Selection" section. X5R or X7R dielectrics are recommended for stable capacitance across voltage and temperature. Using smaller values or non-ceramic types (e.g., standard tantalum) may cause instability or excessive ripple - a design constraint directly tied to the LTC3539EDCB#TRPBF's fixed compensation architecture.
LTC3539EDCB#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
LTC3539EDCB#TRPBF FAQ
1.How can I place an order for LTC3539EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3539EDCB#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#TRPBF reliable?
The price and inventory of LTC3539EDCB#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3539EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3539EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3539EDCB#TRPBF?
LTC3539EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3539EDCB#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#TRPBF?
For technical support, including LTC3539EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3539EDCB#TRPBF requirements.
6.How does Aetrix verify that LTC3539EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3539EDCB#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3539EDCB#TRPBF?
All LTC3539EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3539EDCB#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3539EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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