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Analog Devices Inc. LTC3526LBEDC#TRPBF
- Part No.:
- LTC3526LBEDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526LBEDC#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,315
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Product details
Overview
LTC3526LBEDC#TRPBF from Analog Devices (formerly Linear Technology) is a 1MHz fixed-frequency synchronous step-up DC/DC converter with output disconnect, designed for ultra-low-voltage battery-powered systems. It starts up from 680mV, operates down to 500mV after startup, delivers up to 5.25V output from single-cell alkaline/NiMH or Li-ion sources, and achieves up to 94% efficiency in a 2mm × 2mm DFN-6 package - enabling compact, long-life power in noise-sensitive portable electronics.
For engineers reviewing the LTC3526LBEDC#TRPBF datasheet, LTC3526LBEDC#TRPBF pinout, LTC3526LBEDC#TRPBF application, or LTC3526LBEDC#TRPBF equivalent, key selection criteria include its fixed-frequency low-noise PWM operation (vs. Burst Mode), anti-ring control for EMI reduction, integrated soft-start, 1.195V feedback reference, and guaranteed 550mA switch current limit - all critical for stable, quiet boost conversion in medical instruments and wireless audio devices.
Technical Context
The LTC3526LBEDC#TRPBF employs current-mode PWM control with internal slope compensation and fully integrated N-channel MOSFET switch (0.4Ω RDS(ON)) and P-channel synchronous rectifier (0.6Ω RDS(ON)). Its fixed 1MHz switching frequency enables use of miniature 4.7µH inductors and ceramic capacitors while maintaining tight line/load regulation.
Unlike the LTC3526L variant, the LTC3526LB operates continuously in PWM mode - not Burst Mode - ensuring consistent 1MHz switching and minimal output voltage ripple for low-noise applications. Anti-ring circuitry actively damps inductor ringing in discontinuous conduction mode, and output disconnect eliminates body-diode conduction to enable true zero-VOUT shutdown and reverse-current blocking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 1MHz - enables use of tiny, low-profile inductors (e.g., 4.7µH) and reduces filter capacitor size. |
| Start-Up Input Voltage | 680mV (typ) - allows reliable startup from nearly depleted single-cell batteries. |
| Output Voltage Range | 1.5V to 5.25V - programmable via external resistor divider on FB pin (1.195V reference). |
| Peak Switch Current Limit | 550mA (min), 750mA (typ) - protects internal MOSFETs under overload or short-circuit conditions. |
| Quiescent Current (Active) | 250–500µA - supports extended runtime in always-on, low-duty-cycle portable devices. |
| Shutdown Current | <1µA - minimizes battery drain during system sleep or standby modes. |
| Efficiency | Up to 94% - achieved via synchronous rectification and low RDS(ON) switches, critical for thermal management in sealed enclosures. |
Pinout & Package
The LTC3526LBEDC#TRPBF is housed in a 6-lead, 2mm × 2mm × 0.75mm plastic DFN package with exposed pad (Pin 7) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects internal N-MOSFET drain to inductor; requires short, wide PCB trace to minimize EMI and switching losses. |
| GND (Pin 2 + Exposed Pad Pin 7) | Signal and power ground | Primary return path for input/output currents; exposed pad must be soldered to ground plane for thermal dissipation (θJA = 102°C/W). |
| VIN (Pin 3) | Input supply | Accepts 0.5V–5V input; requires ≥2.2µF ceramic decoupling capacitor placed adjacent to pin. |
| SHDN (Pin 4) | Logic-controlled shutdown | Active-high enable; internal 4MΩ pull-down; drives <1µA quiescent current when pulled low. |
| FB (Pin 5) | Feedback input | Monitors output via resistive divider; 1.195V reference sets VOUT = 1.195V × (1 + R1/R2); high-impedance (≤50nA bias). |
| VOUT (Pin 6) | Output voltage sense / sync rectifier drain | Connects to output capacitor (≥4.7µF); serves as source of internal P-MOSFET; enables output disconnect during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-frequency low-noise PWM | Eliminates Burst Mode switching artifacts - essential for Bluetooth headsets and noise-canceling headphones where audible switching noise must be avoided. |
| Anti-ring control | Internally damps SW-node ringing during discontinuous conduction, reducing radiated EMI without external snubbers. |
| True output disconnect | Blocks reverse current flow and pulls VOUT to 0V during shutdown - prevents battery drain and enables safe hot-swap or multi-rail sequencing. |
| Integrated soft-start | Ramps peak inductor current over ~0.5ms to limit inrush, enabling reliable startup into heavy capacitive loads (e.g., RF modules). |
| Low 680mV start-up voltage | Extends usable battery life in single-cell AA/AAA systems by harvesting energy down to near-dead battery voltage. |
Applications
| Medical Instruments | Noise-Canceling Headphones |
|---|---|
Use Scenario: Portable blood glucose meters and handheld ultrasound probes powered by single alkaline cells. IC Role / Device Role / Timing Role: Primary boost regulator generating stable 3.3V rail from 0.8–1.6V input, enabling MCU, sensor, and display operation across full battery discharge curve. Use Value: 680mV start-up and 94% efficiency extend clinical device runtime by >25% versus legacy charge pumps, while output disconnect prevents battery self-discharge during storage. | Use Scenario: Battery-powered active noise cancellation (ANC) earbuds requiring ultra-low EMI and clean analog supply rails. IC Role / Device Role / Timing Role: Low-noise 3.3V/5V power source for ANC DSP and MEMS microphones, operating continuously at 1MHz without burst-induced ripple. Use Value: Fixed-frequency PWM + anti-ring control reduces conducted/radiated noise by >15dB vs. Burst Mode variants, preventing audible artifacts in sensitive audio paths. |
| Wireless Mice | Bluetooth Headsets |
Use Scenario: Ultra-thin optical mice using coin-cell or AAA batteries with aggressive power cycling. IC Role / Device Role / Timing Role: Compact 2mm × 2mm boost converter delivering 3.3V at 100mA, activated only during motion sensing or BLE transmission bursts. Use Value: <1µA shutdown current and integrated soft-start enable sub-100ms wake-up with no output overshoot - critical for responsive user interface and multi-year battery life. | Use Scenario: Dual-mode Bluetooth 5.0 headsets supporting voice calls and music streaming on single Li-ion cell. IC Role / Device Role / Timing Role: Primary 5V rail generator for USB-C charging circuitry and Class-D amplifier, operating from 2.7–4.3V input with VIN > VOUT capability. Use Value: VIN > VOUT operation allows direct 5V pass-through when battery is above 4.3V, improving system efficiency by bypassing unnecessary conversion during high-SOC charging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3526LEDC#TRPBF | Features Burst Mode operation (9µA IQ) instead of fixed-frequency PWM; identical pinout, package, and core specs. | Better suited for intermittent-load applications (e.g., remote controls) where ultra-low light-load IQ outweighs EMI concerns. | Select LTC3526LEDC#TRPBF only if system load profile is highly duty-cycled and EMI sensitivity is low. |
| TPS610992DRCR | Lower 0.7V start-up (vs. 0.68V), 1.2MHz switching, but lacks output disconnect and anti-ring control; 6-pin WSON package. | Acceptable for cost-sensitive consumer audio where reverse-current blocking is not required and layout allows EMI filtering. | Choose TPS610992DRCR only if board space permits external reverse-blocking diode and EMI mitigation components. |
Compared with LTC3526LEDC#TRPBF, the LTC3526LBEDC#TRPBF trades lower light-load efficiency for superior EMI performance and predictable timing - making it preferable in real-time audio and medical sensing. Versus TPS610992DRCR, it offers integrated output disconnect and anti-ring control, eliminating two external components and simplifying compliance testing.
Availability
LTC3526LBEDC#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, wireless audio peripherals, and Bluetooth-enabled wearables requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3526LBEDC#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 the LTC portfolio.
The LTC3526L/LTC3526LB series was designed specifically for ultra-low-voltage, high-efficiency boost conversion in space-constrained portable electronics - emphasizing startup reliability, low-noise operation, and true output isolation.
FAQ
What is the minimum input voltage required for the LTC3526LBEDC#TRPBF to start up?
The LTC3526LBEDC#TRPBF has a guaranteed minimum start-up input voltage of 680mV (typical), allowing it to initiate regulation from nearly depleted single-cell alkaline or NiMH batteries. Once started, it continues operating down to 500mV input under light loads, leveraging its high 90% maximum duty cycle to sustain output voltage.
How does the LTC3526LBEDC#TRPBF differ from the LTC3526LEDC#TRPBF?
The LTC3526LBEDC#TRPBF uses fixed-frequency PWM operation for low-noise performance, while the LTC3526LEDC#TRPBF employs Burst Mode to achieve 9µA quiescent current at light loads. Both share identical pinout, package, and core specifications (680mV start-up, 1MHz switching, output disconnect), but the LTC3526LBEDC#TRPBF is optimized for EMI-sensitive applications like audio and medical devices.
Does the LTC3526LBEDC#TRPBF support output voltages higher than the input voltage?
Yes, the LTC3526LBEDC#TRPBF supports VIN > VOUT operation - for example, delivering 5V output from a 4.2V Li-ion cell. In this mode, it functions as a regulated pass-through with reduced efficiency and lower maximum output current, but enables seamless transition between battery and USB power without external OR-ing circuitry.
What is the purpose of the exposed pad (Pin 7) on the LTC3526LBEDC#TRPBF DFN package?
Pin 7 is the exposed thermal pad, electrically connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 102°C/W and ensure reliable thermal performance. Failure to solder the pad results in significantly higher junction temperatures and potential thermal shutdown under sustained 200mA+ loads.
Can the LTC3526LBEDC#TRPBF be used without an external Schottky diode?
Yes - and it is recommended. The LTC3526LBEDC#TRPBF integrates a synchronous P-channel rectifier and features true output disconnect, eliminating the need for an external Schottky diode. Adding one defeats output disconnect, increases reverse leakage, and compromises short-circuit protection - though it may marginally improve efficiency in some cases.
LTC3526LBEDC#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3526LBEDC#TRPBF FAQ
1.How can I place an order for LTC3526LBEDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526LBEDC#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#TRPBF reliable?
The price and inventory of LTC3526LBEDC#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3526LBEDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526LBEDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526LBEDC#TRPBF?
LTC3526LBEDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526LBEDC#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#TRPBF?
For technical support, including LTC3526LBEDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526LBEDC#TRPBF requirements.
6.How does Aetrix verify that LTC3526LBEDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526LBEDC#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3526LBEDC#TRPBF?
All LTC3526LBEDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526LBEDC#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3526LBEDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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