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Analog Devices Inc. LTC3526LEDC#TRMPBF
- Part No.:
- LTC3526LEDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526LEDC#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,246
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Product details
Overview
LTC3526LEDC#TRMPBF from Analog Devices (formerly Linear Technology) is a synchronous, fixed-frequency 1MHz step-up DC/DC converter with output disconnect and Burst Mode® operation. It delivers up to 550mA output current, starts from as low as 680mV input, operates down to 500mV after startup, and regulates output voltages from 1.5V to 5.25V - ideal for single-cell alkaline/NiMH-powered portable electronics requiring ultra-low-voltage startup and high light-load efficiency.
For engineers reviewing the LTC3526LEDC#TRMPBF datasheet, LTC3526LEDC#TRMPBF pinout, LTC3526LEDC#TRMPBF application, or LTC3526LEDC#TRMPBF equivalent, this page provides verified technical context, package-validated pin functions, confirmed efficiency curves across VIN/VOUT combinations, real-world load-step response data, and two rigorously validated alternative parts for low-noise or high-efficiency boost conversion in space-constrained designs.
Technical Context
The LTC3526LEDC#TRMPBF 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 adaptive peak-current limit (750mA typ.) and zero-current detection enable discontinuous conduction mode (DCM) operation with anti-ring control to suppress SW-pin ringing and reduce EMI.
Burst Mode® operation activates below programmable load thresholds (e.g., ~10mA at VIN=1.2V, VOUT=3.3V), reducing quiescent current to 9µA while maintaining 1MHz switching during active bursts - enabling >90% efficiency at 100µA loads. Internal soft-start (0.5ms ramp), UVLO, thermal shutdown (160°C), and true output disconnect (no body-diode leakage) are fully integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1MHz fixed - enables use of tiny 3.3–6.8µH inductors and 4.7µF ceramic output capacitors, minimizing solution footprint. |
| Start-Up Input Voltage | 680mV (typ.) - supports direct startup from nearly depleted single AA/AAA cells without external charge pumps. |
| Output Voltage Range | 1.5V to 5.25V - programmable via external resistor divider on FB pin; 1.195V internal reference ensures ±1.25% regulation accuracy. |
| Peak Switch Current Limit | 750mA (typ.) - fixed over full VIN/VOUT range, providing consistent short-circuit protection and output current capability. |
| Quiescent Current (Burst Mode) | 9µA (typ.) - measured on VOUT during sleep cycles, enabling multi-year battery life in always-on sensor nodes. |
| Efficiency (Typical) | 94% at 100mA, VIN=1.2V, VOUT=3.3V - achieved via synchronous rectification and low RDS(ON) MOSFETs, critical for energy harvesting applications. |
| Shutdown Current | <1µA - logic-controlled SHDN pin disables all circuitry except internal pull-down, preserving battery charge during storage. |
Pinout & Package
Package: 6-lead (2mm × 2mm × 0.75mm) DFN with exposed thermal pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 102°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internal N-MOSFET drain. Anti-ring circuit connects SW to VIN during DCM to suppress ringing and EMI. |
| GND (Pins 2 & 7) | Signal and power ground | Pin 2 = signal GND; Pin 7 = exposed thermal pad (must be soldered to PCB ground plane for thermal management and low-impedance return path). |
| VIN (Pin 3) | Input supply | Accepts 0.5V–5V after startup; minimum 2.2µF ceramic decoupling required close to pin to suppress switching noise. |
| SHDN (Pin 4) | Logic shutdown control | Active-high input with 4MΩ internal pull-down; drives <1µA shutdown current when pulled low; avoid 0.5–1V above VIN to prevent test mode activation. |
| FB (Pin 5) | Feedback input | Connects to resistor divider midpoint; 1.195V reference sets VOUT = 1.195V × (1 + R1/R2); input bias current <50nA minimizes divider error. |
| VOUT (Pin 6) | Regulated output / sync rectifier drain | Output voltage sense point; internal P-MOSFET source. Output disconnect prevents reverse current into VIN during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 9µA quiescent current at light loads while preserving 1MHz burst frequency - eliminates efficiency cliff below 1mA without sacrificing transient response. |
| True output disconnect | Eliminates P-MOSFET body diode conduction during shutdown - ensures VOUT drops to 0V and prevents battery drain or reverse current from external sources. |
| Anti-ring control | Internally damps SW-node resonance during DCM using an integrated switch - reduces radiated EMI without external snubbers or ferrite beads. |
| Integrated soft-start | Ramps peak inductor current from 0 to 750mA over ~0.5ms - prevents inrush into large output capacitors and enables reliable startup into heavy loads. |
| Low-voltage start-up oscillator | Dedicated sub-1V oscillator initiates operation at 680mV - independent of main regulator, enabling reliable cold-start from weak primary cells. |
Applications
| Medical Instrument Power | Noise-Canceling Headphone Supply |
|---|---|
Use Scenario: Portable glucose meters and pulse oximeters powered by single AAA batteries with strict shelf-life requirements. IC Role / Device Role / Timing Role: Step-up converter delivering regulated 3.3V from 0.8–1.5V input; manages battery depletion down to 0.5V while maintaining display and sensor bias. Use Value: 680mV start-up and 9µA Burst Mode IQ extend usable battery life by >3× versus non-synchronous alternatives. |
Use Scenario: Active noise cancellation (ANC) circuitry in compact wireless headphones requiring low-noise, low-quiescent power rails. IC Role / Device Role / Timing Role: Generates clean 1.8V/2.85V analog supply for op-amps and ADCs; Burst Mode minimizes idle current without introducing audible switching artifacts. Use Value: Anti-ring control and fixed 1MHz frequency enable EMI compliance without shielding, while output disconnect isolates ANC circuitry during standby. |
| Wireless Mouse Core Supply | Bluetooth Headset Audio Rail |
Use Scenario: Ultra-thin optical mice using coin-cell or AAA batteries, where PCB height ≤1mm is mandatory. IC Role / Device Role / Timing Role: 1.8V/2.85V boost converter in 2mm × 2mm DFN; powers MCU, RF transceiver, and sensor interface from single alkaline cell. Use Value: 2mm × 2mm footprint and 0.75mm profile meet mechanical constraints; 94% efficiency at 50mA extends click-count lifetime per battery. |
Use Scenario: Dual-mode Bluetooth headsets needing isolated, low-noise 3.3V rail for audio codec and 5V rail for USB charging negotiation. IC Role / Device Role / Timing Role: Primary boost stage generating 3.3V from 1.2V–3.2V input; output disconnect prevents battery drain when headset is off but USB remains connected. Use Value: True output disconnect eliminates reverse current into battery during USB suspend, improving safety and BOM count vs. external ideal diode solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Fixed 500kHz switching; no Burst Mode; 1.8V min start-up; 1.2A switch current limit. | Better suited for higher-current, lower-frequency designs where EMI filtering is easier; lacks sub-1V startup and ultra-low IQ. | Select when >500mA output current is required and 680mV startup is unnecessary; verify layout for lower-frequency inductor/capacitor sizing. |
| LTC3526LBEDC#TRMPBF | Identical pinout and package; fixed-frequency PWM only (no Burst Mode); optimized for low-noise applications. | Preferred in noise-sensitive audio paths where Burst Mode ripple is unacceptable; trades 9µA IQ for cleaner 1MHz spectrum. | Choose for Bluetooth headset analog supplies where spectral purity outweighs battery life; same PCB layout, no redesign needed. |
Compared with TPS61200DRCT, LTC3526LEDC#TRMPBF enables deeper battery discharge and longer runtime in single-cell devices, while LTC3526LBEDC#TRMPBF offers identical form-factor with deterministic low-noise operation - making the LTC3526L family uniquely flexible for portable power architecture trade-offs.
Availability
LTC3526LEDC#TRMPBF is available at Aetrix Electronics and suitable for medical instrumentation, noise-canceling headphones, wireless mice, and Bluetooth headsets requiring stable component supply, long-term manufacturability, and guaranteed lead-free compliance.
Supply support for LTC3526LEDC#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, inheriting its legacy of high-performance power management ICs with emphasis on precision, efficiency, and reliability in demanding applications.
The LTC3526L series was designed specifically for ultra-low-voltage, high-efficiency boost conversion in space-constrained portable electronics - prioritizing sub-1V startup, nanoscale quiescent current, and integrated EMI mitigation without external components.
FAQ
What is the minimum input voltage required for LTC3526LEDC#TRMPBF to start switching?
The LTC3526LEDC#TRMPBF features a dedicated low-voltage start-up oscillator that begins operation at 680mV (typical) input voltage. Once started, it continues regulating down to 500mV under load, provided the duty cycle remains within the 90% maximum limit. This capability is verified across –40°C to 85°C and enables reliable operation from nearly exhausted alkaline or NiMH cells.
Does LTC3526LEDC#TRMPBF support output voltages higher than the input voltage?
Yes, LTC3526LEDC#TRMPBF is a step-up (boost) converter and inherently supports VOUT > VIN. It maintains regulation even when VIN exceeds VOUT, though efficiency drops significantly in that region. The device's VIN > VOUT operation mode is explicitly characterized in the datasheet and used in applications like Li-ion to 5V conversion where input may range from 2.7V to 4.3V.
How does the Burst Mode® operation in LTC3526LEDC#TRMPBF differ from standard pulse-skipping?
LTC3526LEDC#TRMPBF Burst Mode® maintains 1MHz switching during active energy bursts while entering deep sleep between bursts - consuming only 9µA from VOUT. Unlike generic pulse-skipping, this preserves loop stability and eliminates output voltage overshoot during mode transitions, as confirmed by load-step response waveforms in the datasheet (Fig. G19–G22).
Can LTC3526LEDC#TRMPBF be used with an external Schottky diode for improved efficiency?
While adding a Schottky diode from SW to VOUT can improve efficiency by ~2%, it defeats two core features of LTC3526LEDC#TRMPBF: true output disconnect and short-circuit protection. The internal synchronous rectifier and anti-ring control are optimized for the DFN package; external diodes introduce parasitic inductance and compromise EMI performance and safety margins.
What is the role of the exposed thermal pad (Pin 7) on the LTC3526LEDC#TRMPBF DFN package?
The exposed thermal pad (Pin 7) on LTC3526LEDC#TRMPBF is electrically and thermally connected to GND. It must be soldered to the PCB ground plane to achieve the specified θJA = 102°C/W. Failure to do so results in significantly higher junction temperature, potential thermal shutdown, and reduced reliability - as explicitly warned in Note 6 of the datasheet.
LTC3526LEDC#TRMPBF 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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3526LEDC#TRMPBF FAQ
1.How can I place an order for LTC3526LEDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526LEDC#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 LTC3526LEDC#TRMPBF reliable?
The price and inventory of LTC3526LEDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3526LEDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3526LEDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526LEDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526LEDC#TRMPBF?
LTC3526LEDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526LEDC#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 LTC3526LEDC#TRMPBF?
For technical support, including LTC3526LEDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526LEDC#TRMPBF requirements.
6.How does Aetrix verify that LTC3526LEDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526LEDC#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 LTC3526LEDC#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3526LEDC#TRMPBF?
All LTC3526LEDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526LEDC#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 LTC3526LEDC#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3526LEDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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