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Analog Devices Inc. LTC3526LBEDC-2#TRPBF
- Part No.:
- LTC3526LBEDC-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526LBEDC-2#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3526LBEDC-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, supports input start-up down to 680mV, operates with VIN as low as 500mV after start-up, and regulates VOUT from 1.5V to 5.25V - enabling single-cell alkaline/NiMH or Li-ion powered portable electronics.
For engineers reviewing the LTC3526LBEDC-2#TRPBF datasheet, LTC3526LBEDC-2#TRPBF pinout, LTC3526LBEDC-2#TRPBF application, or LTC3526LBEDC-2#TRPBF equivalent, key selection criteria include its low-noise fixed-frequency PWM operation (vs. Burst Mode), anti-ring control for EMI reduction, integrated soft-start, internal synchronous rectification, and logic-controlled shutdown with <1µA quiescent current.
Technical Context
The LTC3526LBEDC-2#TRPBF implements current-mode PWM control with internal compensation and a 2MHz oscillator, eliminating need for external loop components. Its architecture includes adaptive slope compensation, zero-current detection for synchronous rectifier turn-off, and anti-ringing circuitry that connects SW to VIN during discontinuous conduction mode to suppress high-frequency ringing.
Unlike the LTC3526L-2 variant, the LTC3526LB-2 (including LTC3526LBEDC-2#TRPBF) operates exclusively in fixed-frequency PWM mode - avoiding Burst Mode transitions - making it suitable for noise-sensitive applications such as audio amplifiers and RF subsystems where spectral purity and predictable EMI are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2MHz (typical); enables use of tiny 2.2µH inductors and compact ceramic capacitors, minimizing solution footprint. |
| Input Voltage Range | 0.5V to 5V post-start-up; supports ultra-low-voltage battery operation after initial 680mV start-up. |
| Output Voltage Range | 1.5V to 5.25V; programmable via external resistor divider on FB pin, supporting common rails like 1.8V, 2.85V, 3.3V, and 5V. |
| Peak Switch Current Limit | 550mA (min), 750mA (typ); ensures robust overcurrent protection while maintaining high efficiency across load range. |
| Quiescent Current (Active) | 250–500µA; low operating IQ extends battery life in always-on or intermittently active portable devices. |
| Shutdown Current | <1µA; enables deep power-down for extended standby periods without significant battery drain. |
| Feedback Reference Voltage | 1.195V (typ); precise internal reference enables accurate output regulation with minimal external component tolerance impact. |
Pinout & Package
The LTC3526LBEDC-2#TRPBF is supplied in a 6-lead (2mm × 2mm × 0.75mm) plastic DFN package with exposed thermal pad (Pin 7, GND). The exposed pad must be soldered to PCB ground plane for thermal performance (θJA = 102°C/W) 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 PCB trace to minimize EMI and voltage spikes. |
| GND (Pin 2 + Exposed Pad Pin 7) | Signal and power ground | Primary return path for input/output capacitors and internal switches; exposed pad is mandatory for thermal dissipation and low-impedance grounding. |
| VIN (Pin 3) | Input supply | Accepts 0.5–5V input; requires ≥2.2µF ceramic decoupling capacitor placed adjacent to pin with low-inductance layout. |
| SHDN (Pin 4) | Logic-controlled enable | Active-high input with 4MΩ internal pull-down; drives low (<0.3V) to enter shutdown with <1µA IQ; avoid 0.5–1V above VIN to prevent test mode activation. |
| FB (Pin 5) | Feedback input | Senses output voltage via resistive divider; internal 1.195V reference sets regulation point; sensitive node requiring minimized trace length and guard ring. |
| VOUT (Pin 6) | Regulated output / rectifier drain | Output voltage sense point and drain of internal P-channel synchronous rectifier; connects directly to output capacitor with short/wide trace. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency 2MHz PWM operation | Ensures consistent switching spectrum for easier EMI filtering and avoids audible noise in audio applications. |
| Anti-ring control circuitry | Damps SW-node ringing during discontinuous conduction mode, reducing high-frequency radiated emissions without external components. |
| True output disconnect | Eliminates body-diode conduction path; allows VOUT to fall to 0V during shutdown and prevents reverse current into VIN source (e.g., battery). |
| Integrated soft-start | Ramps peak inductor current from 0 to 750mA over ~0.5ms, preventing inrush surges into large output capacitors or heavy loads. |
| Low 680mV start-up voltage | Enables operation from nearly depleted single-cell batteries (alkaline/NiMH), extending usable battery life in energy-constrained devices. |
Applications
| Noise-Canceling Headphones | Wireless Mice |
|---|---|
Use Scenario: Powering analog front-end and DSP in battery-operated headphones requiring ultra-low EMI and stable 3.3V rail. IC Role / Device Role / Timing Role: Step-up regulator generating clean 3.3V from 1.2V–1.6V single alkaline cell, using fixed-frequency PWM to avoid interference with audio band. Use Value: Anti-ring control and fixed-frequency operation reduce conducted/radiated noise near sensitive audio circuits, preserving SNR and cancellation fidelity. | Use Scenario: Supplying 2.85V to RF transceiver and MCU in compact USB wireless mice powered by single AA/AAA cell. IC Role / Device Role / Timing Role: Synchronous boost converter delivering regulated 2.85V at up to 100mA with <1µA shutdown current for multi-month standby life. Use Value: 680mV start-up and 500mV operating minimum extend usable battery capacity; output disconnect prevents battery drain when device is off. |
| Bluetooth Headsets | Medical Instruments |
Use Scenario: Providing low-noise 3.3V supply to Bluetooth radio IC and voice codec in hearing-aid-sized headsets. IC Role / Device Role / Timing Role: Fixed-frequency 2MHz boost converter with integrated soft-start and output disconnect, ensuring glitch-free power sequencing and zero reverse current. Use Value: Predictable 2MHz spectrum simplifies EMI compliance; true output disconnect eliminates battery leakage through headset's VOUT path during storage. | Use Scenario: Powering precision analog sensors and low-power microcontrollers in handheld medical monitors (e.g., pulse oximeters) running from one or two cells. IC Role / Device Role / Timing Role: High-efficiency synchronous boost delivering 5V at 150mA from 1.8V–3.2V input, with thermal shutdown for safety-critical reliability. Use Value: Up to 94% efficiency at mid-load preserves battery runtime; thermal shutdown (160°C) protects against fault conditions in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 500mA max output, 1.2MHz switching, no output disconnect, higher 900mV start-up voltage | Lacks true output disconnect and ultra-low start-up; less suitable for battery-leakage-sensitive designs | Select when cost sensitivity outweighs need for sub-1V start-up or output isolation |
| MAX17222ETA+T | 500mA, 2MHz, 700mV start-up, no anti-ring control, no thermal shutdown | Missing anti-ring circuitry increases EMI risk; no thermal protection limits use in enclosed medical or industrial housings | Prefer for space-constrained consumer wearables where thermal margin is sufficient and EMI filtering is added externally |
Compared with TPS61200DRCT and MAX17222ETA+T, the LTC3526LBEDC-2#TRPBF offers superior ultra-low-voltage start-up (680mV), guaranteed output disconnect, integrated anti-ring control, and thermal shutdown - making it uniquely suited for high-reliability, low-noise, battery-isolated portable systems.
Availability
LTC3526LBEDC-2#TRPBF is available at Aetrix Electronics and suitable for noise-canceling headphones, wireless mice, Bluetooth headsets, and handheld medical instruments requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3526LBEDC-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 full product support, documentation, and manufacturing continuity for all Linear-branded power management ICs.
The LTC3526L/LB-2 series was designed specifically for ultra-low-voltage, high-efficiency boost conversion in space-constrained portable electronics - emphasizing minimal bill-of-materials, low EMI, and extended battery life from single-cell sources.
FAQ
What is the minimum input voltage required for LTC3526LBEDC-2#TRPBF to start up?
The LTC3526LBEDC-2#TRPBF has a guaranteed minimum start-up input voltage of 680mV (typical), enabled by an independent start-up oscillator. Once started, it continues operating down to 500mV input voltage, provided load current remains within capability limits defined by duty cycle and switch current rating. This makes LTC3526LBEDC-2#TRPBF ideal for deeply discharged alkaline or NiMH cells.
Does LTC3526LBEDC-2#TRPBF support output voltages other than 3.3V?
Yes, LTC3526LBEDC-2#TRPBF supports adjustable output voltages from 1.5V to 5.25V using an external resistor divider on the FB pin. The internal 1.195V reference allows precise programming - for example, 1.8V (using 511k/1M divider), 2.85V (1.4M/1M), or 5V (3.24M/1.02M). All configurations retain full functionality including output disconnect and anti-ring control.
How does LTC3526LBEDC-2#TRPBF differ from LTC3526LEDCC-2#TRPBF?
The LTC3526LBEDC-2#TRPBF uses fixed-frequency PWM operation only, while the LTC3526LEDCC-2#TRPBF employs Burst Mode® at light loads to achieve 9µA quiescent current. LTC3526LBEDC-2#TRPBF avoids mode transitions entirely, delivering lower EMI and predictable switching spectra - critical for audio and RF applications where Burst Mode ripple and frequency modulation are undesirable.
Is thermal management required for LTC3526LBEDC-2#TRPBF in continuous 200mA operation?
Yes - the LTC3526LBEDC-2#TRPBF includes thermal shutdown at 160°C and requires proper thermal design. The exposed pad (Pin 7) must be soldered to a PCB ground plane; failure to do so raises θJA significantly above the rated 102°C/W. At 200mA output with 3.3V out from 1.2V in, typical power dissipation is ~120mW - adequate copper area and airflow ensure safe junction temperature below 125°C under continuous load.
Can LTC3526LBEDC-2#TRPBF be used in VIN > VOUT configurations?
Yes, LTC3526LBEDC-2#TRPBF maintains regulation even when VIN exceeds VOUT (e.g., 4.2V Li-ion input to 3.3V output), though efficiency drops and maximum output current is reduced due to increased conduction losses and duty-cycle constraints. In this mode, the internal P-channel rectifier remains active only when VOUT > (VIN + 0.24V); otherwise, regulation relies on N-MOSFET switching alone.
LTC3526LBEDC-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)
LTC3526LBEDC-2#TRPBF FAQ
1.How can I place an order for LTC3526LBEDC-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526LBEDC-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 LTC3526LBEDC-2#TRPBF reliable?
The price and inventory of LTC3526LBEDC-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 LTC3526LBEDC-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3526LBEDC-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526LBEDC-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526LBEDC-2#TRPBF?
LTC3526LBEDC-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526LBEDC-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 LTC3526LBEDC-2#TRPBF?
For technical support, including LTC3526LBEDC-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526LBEDC-2#TRPBF requirements.
6.How does Aetrix verify that LTC3526LBEDC-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526LBEDC-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 LTC3526LBEDC-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3526LBEDC-2#TRPBF?
All LTC3526LBEDC-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526LBEDC-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 LTC3526LBEDC-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3526LBEDC-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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