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Analog Devices Inc. LTC3526LEDC#TRPBF
- Part No.:
- LTC3526LEDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526LEDC#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,759
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Product details
Overview
LTC3526LEDC#TRPBF 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 680mV input, regulates 1.5V–5.25V outputs, and operates down to 500mV after startup-enabling single AA/AAA battery operation in portable medical instruments and noise-canceling headphones.
For engineers reviewing the LTC3526LEDC#TRPBF datasheet, LTC3526LEDC#TRPBF pinout, LTC3526LEDC#TRPBF application, or LTC3526LEDC#TRPBF equivalent, key selection criteria include its 680mV start-up voltage, integrated soft-start, 9µA quiescent current in Burst Mode, internal synchronous rectifier, and 2mm × 2mm DFN-6 package with exposed thermal pad.
Technical Context
The LTC3526LEDC#TRPBF employs current-mode PWM control with internal slope compensation and adaptive zero-current detection to enable fast transient response and high efficiency across wide load ranges. Its architecture integrates an N-channel MOSFET switch (RDS(ON) = 0.4Ω) and P-channel synchronous rectifier (RDS(ON) = 0.6Ω), enabling true output disconnect and VIN > VOUT regulation.
Burst Mode® operation activates below programmable load thresholds (e.g., ~15mA at VIN = 1.2V, VOUT = 3.3V), reducing quiescent current to 9µA while maintaining 1MHz switching during active bursts. Anti-ring control damps SW-pin ringing in discontinuous conduction mode to suppress EMI without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1MHz fixed-enables use of compact 3.3–6.8µH inductors and ceramic capacitors, minimizing solution footprint. |
| Start-Up Input Voltage | 680mV typical-allows reliable startup from nearly depleted alkaline/NiMH cells, extending usable battery life. |
| Output Voltage Range | 1.5V to 5.25V-programmable via external resistor divider on FB pin, supporting common logic rails and sensor supplies. |
| Peak Switch Current Limit | 750mA typical-provides robust overcurrent protection while sustaining high output current into low-VIN conditions. |
| Quiescent Current (Burst Mode) | 9µA-minimizes standby power loss in always-on portable devices such as wireless mice and Bluetooth headsets. |
| Efficiency | Up to 94%-achieved via synchronous rectification and low RDS(ON) switches, critical for thermal management in 2mm × 2mm DFN. |
| Shutdown Current | <1µA-ensures near-zero battery drain during system sleep, preserving shelf life in medical instrumentation. |
Pinout & Package
The LTC3526LEDC#TRPBF is housed in a 6-lead, 2mm × 2mm × 0.75mm plastic DFN package with exposed thermal pad (Pin 7), which must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internal N-MOSFET drain-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 capacitors and thermal dissipation-exposed pad must be soldered to ground plane. |
| VIN (Pin 3) | Input supply | Accepts 0.5V–5V after startup; supports single-cell alkaline/NiMH (0.68V start) and Li-ion sources. |
| SHDN (Pin 4) | Logic-controlled shutdown | Active-high enable; internal 4MΩ pull-down-driving low reduces IQ to <1µA; avoid 0.5–1V above VIN/VOUT to prevent test mode activation. |
| FB (Pin 5) | Feedback input | Monitors output via resistor divider; reference voltage = 1.195V-sets VOUT = 1.195V × (1 + R1/R2). |
| VOUT (Pin 6) | Output voltage sense / rectifier drain | Drain of internal P-MOSFET synchronous rectifier-enables output disconnect and prevents reverse current into battery. |
Key Features
| Feature | Design Value |
|---|---|
| Output Disconnect | Eliminates body-diode conduction-ensures VOUT = 0V during shutdown and prevents reverse current into VIN, critical for battery-backed systems. |
| Burst Mode® Operation | Reduces IQ to 9µA at light loads while retaining 1MHz burst frequency-maintains regulation accuracy without output voltage droop during mode transitions. |
| Integrated Soft-Start | Ramps peak inductor current from 0 to 750mA over ~0.5ms-prevents inrush surges when powering capacitive loads like LED drivers or RF modules. |
| Anti-Ringing Control | Internally connects SW to VIN during discontinuous mode-suppresses high-frequency ringing without external snubbers, lowering EMI in noise-sensitive audio applications. |
| Low-Voltage Start-Up | Independent oscillator starts at 680mV-enables operation from deeply discharged cells where conventional boost converters fail to initialize. |
Applications
| Medical Instrument Power | Noise-Canceling Headphone Supply |
|---|---|
Use Scenario: Powering low-noise analog front-ends and DSPs in handheld glucose meters and pulse oximeters from a single AA cell. IC Role / Device Role / Timing Role: Primary step-up regulator delivering stable 3.3V rail with ultra-low quiescent current and true output disconnect during sleep cycles. Use Value: Extends battery life beyond 6 months by minimizing no-load power loss and enabling deep-sleep modes without leakage paths. |
Use Scenario: Generating clean 3.3V supply for ANC ASICs and MEMS microphones in compact over-ear headphones. IC Role / Device Role / Timing Role: Synchronous boost converter with anti-ring control and fixed 1MHz switching-reducing conducted EMI that could interfere with audio signal integrity. Use Value: Achieves <10mVPP output ripple with 10µF ceramic capacitor, eliminating audible switching noise in sensitive audio paths. |
| Wireless Mouse Core Supply | Bluetooth Headset Transceiver Power |
Use Scenario: Providing regulated 2.85V for MCU and optical sensor in ultra-thin USB wireless mice powered by AAA batteries. IC Role / Device Role / Timing Role: High-efficiency boost converter operating down to 500mV input-supporting full functionality even at end-of-battery voltage. Use Value: Delivers 100mA at 92% efficiency from 0.9V input, enabling 12+ months of operation per battery set. |
Use Scenario: Supplying 3.3V to Bluetooth 5.0 radio ICs and voice codecs in earbud-style headsets with tight height constraints. IC Role / Device Role / Timing Role: Compact 2mm × 2mm DFN-6 regulator with integrated soft-start-preventing brown-out during rapid radio wake-up events. Use Value: 0.5ms soft-start avoids voltage sag on shared battery rail, ensuring reliable BLE connection establishment within 100ms. |
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 | Lower start-up voltage (0.3V), but no output disconnect; uses external diode; 0.95MHz switching. | Lacks true output disconnect-unsuitable for battery-reverse-protection-critical designs. | Select only if lowest possible start-up voltage outweighs need for reverse-current blocking. |
| MAX17222ATA+ | Higher IQ in shutdown (1.5µA vs <1µA); same 680mV start-up; includes power-good flag. | Power-good output enables sequencing in multi-rail systems; slightly larger 2mm × 2mm WLP package. | Prefer when system-level power sequencing or status monitoring is required alongside low-IQ operation. |
Compared with TPS61200DRCT and MAX17222ATA+, the LTC3526LEDC#TRPBF uniquely combines true output disconnect, 9µA Burst Mode IQ, and anti-ring EMI suppression in a thermally optimized 2mm × 2mm DFN-making it optimal for space-constrained, battery-sensitive audio and medical applications.
Availability
LTC3526LEDC#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, noise-canceling headphone design, and wireless peripheral development requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3526LEDC#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 legacy of high-performance power management ICs for precision, portable, and industrial applications.
The LTC3526L series was designed specifically for ultra-low-voltage, high-efficiency boost conversion in single-cell battery-powered devices-emphasizing start-up reliability, light-load efficiency, and minimal solution size.
FAQ
What is the minimum input voltage required for the LTC3526LEDC#TRPBF to start up?
The LTC3526LEDC#TRPBF has a guaranteed minimum start-up input voltage of 680mV (typical), enabling reliable operation from nearly depleted alkaline or NiMH cells. Once started, it continues regulating down to 500mV input under light loads, provided the maximum duty cycle (90%) is not exceeded. This capability is critical for maximizing battery utilization in devices like wireless mice and medical sensors.
Does the LTC3526LEDC#TRPBF support output voltages higher than the input voltage?
Yes, the LTC3526LEDC#TRPBF is a step-up (boost) converter and inherently supports VOUT > VIN. It also supports VIN > VOUT operation-maintaining regulation even when input exceeds output-but with reduced efficiency and lower maximum output current. This dual-mode capability allows flexible use across varying battery states, such as transitioning from fresh to depleted Li-ion cells.
How does the Burst Mode® operation in the LTC3526LEDC#TRPBF improve efficiency at light loads?
In Burst Mode®, the LTC3526LEDC#TRPBF delivers energy in short 1MHz bursts until VOUT reaches regulation, then enters sleep mode drawing only 9µA from VOUT. When VOUT droops, it resumes bursting-eliminating continuous switching and gate-drive losses. This achieves up to 85% efficiency at 100µA load, far exceeding fixed-frequency operation, which is essential for always-on portable electronics.
What is the purpose of the exposed thermal pad (Pin 7) on the LTC3526LEDC#TRPBF DFN package?
The exposed thermal pad (Pin 7) on the LTC3526LEDC#TRPBF serves as both an additional GND connection and primary thermal conduction path. It must be soldered to the PCB ground plane to achieve the specified θJA = 102°C/W. Failure to do so increases junction temperature significantly-risking thermal shutdown and long-term reliability degradation, especially under sustained 550mA output conditions.
Can the LTC3526LEDC#TRPBF be used with an external Schottky diode?
While an external Schottky diode from SW to VOUT can improve efficiency by ~2%, it defeats two core features of the LTC3526LEDC#TRPBF: true output disconnect and short-circuit protection. The internal synchronous rectifier relies on controlled gate drive; adding a diode creates a parallel conduction path that prevents VOUT from discharging to zero during shutdown and disables the 400mA short-circuit current limit. Therefore, external diodes are not recommended unless those features are intentionally sacrificed.
LTC3526LEDC#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)
LTC3526LEDC#TRPBF FAQ
1.How can I place an order for LTC3526LEDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526LEDC#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#TRPBF reliable?
The price and inventory of LTC3526LEDC#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3526LEDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526LEDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526LEDC#TRPBF?
LTC3526LEDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526LEDC#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#TRPBF?
For technical support, including LTC3526LEDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526LEDC#TRPBF requirements.
6.How does Aetrix verify that LTC3526LEDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526LEDC#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3526LEDC#TRPBF?
All LTC3526LEDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526LEDC#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3526LEDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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