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Analog Devices Inc. LTC3526LEDC-2#TRPBF
- Part No.:
- LTC3526LEDC-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526LEDC-2#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,839
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Product details
Overview
LTC3526LEDC-2#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous, fixed-frequency step-up DC/DC converter with output disconnect, housed in a 6-lead 2mm × 2mm × 0.75mm DFN package. It delivers up to 550mA output current at 2MHz switching frequency, starts up from as low as 680mV input, and regulates output voltages from 1.5V to 5.25V - enabling single-cell alkaline/NiMH or Li-ion powered portable electronics requiring compact, high-efficiency boost conversion.
For engineers reviewing the LTC3526LEDC-2#TRPBF datasheet, LTC3526LEDC-2#TRPBF pinout, LTC3526LEDC-2#TRPBF application, or LTC3526LEDC-2#TRPBF equivalent, this page provides verified technical context, real-world performance boundaries, validated pin functions, confirmed alternative options for burst-mode boost applications, and supply-chain-ready availability details - all grounded in the official LTC3526L-2/LTC3526LB-2 datasheet (3526lb2fa).
Technical Context
The LTC3526LEDC-2#TRPBF implements current-mode PWM control with internal slope compensation and fully integrated N-channel switch (0.4Ω RDS(ON)) and P-channel synchronous rectifier (0.6Ω RDS(ON)). Its 2MHz oscillator enables use of sub-3mm inductors and ceramic capacitors, while adaptive zero-current detection disables the rectifier below ~30mA to prevent reverse conduction and improve light-load efficiency.
Burst Mode® operation (exclusive to LTC3526L-2 variants) reduces quiescent current to 9µA at light loads by entering sleep cycles between energy bursts, maintaining regulation with <1% peak-to-peak ripple when paired with ≥10µF output capacitance. Output disconnect is achieved via controlled gate drive that eliminates body-diode conduction during shutdown, ensuring true VOUT = 0V and no reverse current into VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2MHz typical - enables use of 2.2µH inductors <3mm height and 4.7µF ceramic output caps, minimizing solution footprint. |
| Start-Up Input Voltage | 680mV typical - supports operation from near-dead single-cell batteries (e.g., 0.9V alkaline), extending usable battery life. |
| Output Voltage Range | 1.5V to 5.25V - programmable via external resistor divider on FB pin; supports 1.8V, 2.85V, 3.3V, and 5V rails from low-input sources. |
| Peak Switch Current Limit | 750mA typical - sets maximum inductor current independent of VIN/VOUT (except when VOUT < 0.7V, then halved). |
| Quiescent Current (Burst Mode) | 9µA typical - measured on VOUT during sleep cycles, critical for always-on sensor nodes and hearing aids. |
| Efficiency | Up to 94% - achieved at mid-load (e.g., 100mA @ 3.3V from 1.2V), enabled by synchronous rectification and low RDS(ON) switches. |
| Shutdown Current | <1µA - ensures negligible battery drain during system sleep; SHDN pin has internal 4MΩ pull-down. |
Pinout & Package
Package: 6-lead (2mm × 2mm × 0.75mm) plastic DFN with exposed thermal pad (Pin 7, GND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 102°C/W) and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internal N-MOSFET drain. Must be routed short/wide to minimize EMI; anti-ring circuit connects SW to VIN in discontinuous mode. |
| GND (Pin 2 + Exposed Pad Pin 7) | Signal & power ground | Primary return path for input/output caps and IC core; exposed pad is mandatory GND connection for thermal dissipation and noise control. |
| VIN (Pin 3) | Input supply | Accepts 0.5V–5V after start-up; requires ≥1µF ceramic decoupling cap placed adjacent to pin with short traces. |
| SHDN (Pin 4) | Logic-controlled enable | Active-high shutdown control; internal 4MΩ pull-down; must stay <(VIN + 0.4V) if driven above VIN to avoid test-mode activation. |
| FB (Pin 5) | Feedback input | Connects to resistor divider midpoint; senses 1.195V reference; input bias current ≤50nA enables high-impedance dividers. |
| VOUT (Pin 6) | Regulated output / rectifier drain | Output voltage sense point and P-MOSFET source; requires short/wide trace to ≥4.7µF output capacitor; enables true output disconnect. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated soft-start | Ramps peak inductor current from 0 to 750mA in ~0.5ms - prevents inrush surges into heavy loads at turn-on. |
| Output disconnect | Eliminates P-MOSFET body diode conduction - ensures VOUT = 0V and zero reverse current into battery during shutdown. |
| Anti-ring control | Internal switch damps SW-node ringing in discontinuous mode - reduces radiated EMI without external snubbers. |
| Thermal shutdown | Activates at TJ > 160°C and auto-recovers at ~145°C - protects against sustained overload or poor PCB thermal design. |
| Low-noise PWM option | LTC3526LB-2 variant uses fixed-frequency operation only; LTC3526L-2 (this part) adds Burst Mode for ultra-low IQ. |
Applications
| Noise-Canceling Headphones | Wireless Mice |
|---|---|
Use Scenario: Powering analog audio circuitry and MEMS microphones from a single AA/AAA cell while maintaining low-noise 3.3V rail. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated 3.3V output with Burst Mode to extend battery life during standby. Use Value: 94% efficiency at 100mA and 9µA quiescent current in Burst Mode enable >6-month battery life in always-listening mode. | Use Scenario: Generating stable 2.85V or 3.3V from one or two alkaline cells for RF transceiver and MCU in ultra-low-power wireless mice. IC Role / Device Role / Timing Role: Step-up regulator with output disconnect preventing battery drain when mouse is idle or off. Use Value: 680mV start-up voltage allows full functionality down to 0.9V cell voltage, maximizing usable battery capacity. |
| Bluetooth Headsets | Medical Instruments |
Use Scenario: Supplying clean 3.3V to Bluetooth SoC and audio codec in compact earbud form factor with strict height constraints (<1mm). IC Role / Device Role / Timing Role: High-frequency (2MHz) boost converter enabling use of 2.2µH shielded inductor and 4.7µF ceramic cap for minimal profile. Use Value: 2MHz operation shrinks passive size; synchronous rectification avoids Schottky losses, improving thermal margin in sealed enclosure. | Use Scenario: Powering precision analog front-ends and low-power microcontrollers in handheld diagnostic tools powered by coin cells or single alkaline. IC Role / Device Role / Timing Role: Ultra-low-voltage boost converter delivering regulated 1.8V or 3.3V with guaranteed start-up below 1V. Use Value: 0.68V start-up and 500mV operational minimum ensure reliable function even as battery depletes to end-of-life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 500mA max output, 1.2MHz switching, 0.9V start-up, no output disconnect, 20µA IQ in PFM mode | Lacks true output disconnect and Burst Mode's 9µA IQ; higher minimum start-up voltage limits single-cell alkaline use. | Select when cost sensitivity outweighs ultra-low IQ and output isolation requirements. |
| MAX17222ETA+T | 400mA max output, 2.5MHz switching, 0.7V start-up, 1.5µA IQ in shutdown, no Burst Mode | Higher switching frequency but lower current capability and no light-load burst optimization; no integrated anti-ring control. | Select for space-constrained designs needing >2MHz operation where 400mA output suffices and EMI mitigation is handled externally. |
Compared with TPS61200DRCT and MAX17222ETA+T, the LTC3526LEDC-2#TRPBF uniquely combines 550mA output, 680mV start-up, 9µA Burst Mode IQ, and true output disconnect - making it optimal for battery-critical, single-cell portable devices demanding both longevity and system-level power control.
Availability
LTC3526LEDC-2#TRPBF is available at Aetrix Electronics and suitable for noise-canceling headphones, wireless mice, Bluetooth headsets, and medical instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for LTC3526LEDC-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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3526L-2 product line was designed specifically for ultra-low-voltage, high-efficiency boost conversion in space-constrained portable electronics - emphasizing start-up from near-dead batteries, minimal external components, and robust light-load efficiency via Burst Mode®.
FAQ
What is the minimum input voltage required for LTC3526LEDC-2#TRPBF to start up and regulate?
The LTC3526LEDC-2#TRPBF guarantees start-up at 680mV (typical) input voltage with 1mA load, per the Absolute Maximum Ratings table and Typical Performance Characteristics (Figure G07). Once started, it continues regulating down to 500mV input - provided the load is light enough to stay within the 90% maximum duty cycle limit. This makes LTC3526LEDC-2#TRPBF ideal for deeply depleted single-cell alkaline or NiMH applications.
Does LTC3526LEDC-2#TRPBF support output voltages other than 3.3V?
Yes - LTC3526LEDC-2#TRPBF supports adjustable output voltages from 1.5V to 5.25V using an external resistor divider on the FB pin, based on the formula VOUT = 1.195V × (1 + R1/R2). The datasheet confirms this range in Electrical Characteristics (Table, "Output Voltage Adjust Range") and shows working examples for 1.8V, 2.85V, 3.3V, and 5V in Typical Applications (Figures TA02a–TA08a). LTC3526LEDC-2#TRPBF does not have a factory-trimmed fixed output; all configurations require external resistors.
How does the Burst Mode® operation in LTC3526LEDC-2#TRPBF reduce power consumption?
Burst Mode® in LTC3526LEDC-2#TRPBF reduces quiescent current to 9µA (typical) by cycling between active 2MHz switching bursts and deep-sleep periods where all internal circuitry except the wake comparator is disabled. During sleep, LTC3526LEDC-2#TRPBF draws current only from VOUT to sustain the error amplifier reference - eliminating switching losses and most bias currents. This is confirmed in Electrical Characteristics (IQ-Burst row) and Figure G15, and differentiates LTC3526LEDC-2#TRPBF from fixed-frequency-only variants like LTC3526LB-2.
What is the purpose of the exposed thermal pad (Pin 7) on the LTC3526LEDC-2#TRPBF DFN package?
The exposed thermal pad (Pin 7) on the LTC3526LEDC-2#TRPBF is electrically and thermally connected to GND and must be soldered to the PCB ground plane. As stated in the Pin Configuration diagram and Note 6, failure to do so raises thermal resistance far above the specified 102°C/W, risking thermal shutdown under moderate load. It also serves as a low-inductance ground return path critical for EMI control and stable current-mode loop operation - not merely a mechanical heatsink.
Can LTC3526LEDC-2#TRPBF be used in applications where VIN exceeds VOUT?
Yes - LTC3526LEDC-2#TRPBF supports VIN > VOUT operation (buck-boost-like behavior) per the "VIN > VOUT Operation" section (page 10). In this mode, regulation is maintained but efficiency drops significantly and maximum output current is reduced due to increased conduction losses and duty-cycle limitations. The datasheet explicitly warns that "efficiency is much lower in this mode", and recommends verifying performance in actual conditions using Figures G01–G04. LTC3526LEDC-2#TRPBF remains functional but is optimized for step-up (VIN < VOUT) use cases.
LTC3526LEDC-2#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):
- 0.5V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 550mA (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3526LEDC-2#TRPBF FAQ
1.How can I place an order for LTC3526LEDC-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526LEDC-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 LTC3526LEDC-2#TRPBF reliable?
The price and inventory of LTC3526LEDC-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 LTC3526LEDC-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3526LEDC-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526LEDC-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526LEDC-2#TRPBF?
LTC3526LEDC-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526LEDC-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 LTC3526LEDC-2#TRPBF?
For technical support, including LTC3526LEDC-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526LEDC-2#TRPBF requirements.
6.How does Aetrix verify that LTC3526LEDC-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526LEDC-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 LTC3526LEDC-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3526LEDC-2#TRPBF?
All LTC3526LEDC-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526LEDC-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 LTC3526LEDC-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3526LEDC-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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