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Analog Devices Inc. LTC3526LEDC-2#TRMPBF
- Part No.:
- LTC3526LEDC-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526LEDC-2#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 550MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,067
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Product details
Overview
LTC3526LEDC-2#TRMPBF from Analog Devices (formerly Linear Technology) is a synchronous, fixed-frequency 2MHz 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-powered devices like wireless mice and Bluetooth headsets.
For engineers reviewing the LTC3526LEDC-2#TRMPBF datasheet, LTC3526LEDC-2#TRMPBF pinout, LTC3526LEDC-2#TRMPBF application, or LTC3526LEDC-2#TRMPBF equivalent, key selection criteria include ultra-low start-up voltage, integrated soft-start, internal synchronous rectification, anti-ring control for EMI reduction, and guaranteed 94% peak efficiency at 200mA into 3.3V from two alkaline cells.
Technical Context
The LTC3526LEDC-2#TRMPBF uses current-mode PWM control with internal slope compensation and fully integrated loop compensation-eliminating external compensation components. Its adaptive peak-current sensing architecture enables fast transient response and stable regulation across wide input (0.5V–5V) and output (1.5V–5.25V) ranges.
Burst Mode® operation reduces quiescent current to 9µA at light loads while maintaining fixed 2MHz switching during active bursts; shutdown draws <1µA. The device features zero-current detection for synchronous rectifier turn-off, anti-ringing circuitry to damp SW-pin oscillation in discontinuous mode, and true output disconnect via controlled P-channel MOSFET gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2MHz (±20%) - enables use of sub-3mm ceramic inductors and compact 4.7µF output capacitors |
| Start-Up Input Voltage | 680mV (typ) - supports direct startup from single depleted alkaline/NiMH cells |
| Output Voltage Range | 1.5V to 5.25V - programmable via external resistor divider on FB pin |
| Peak Switch Current Limit | 750mA (typ) - limits inductor current regardless of VIN/VOUT, clamped at 90% max duty cycle |
| Quiescent Current (Burst) | 9µA (typ) - sustains >100-hour runtime in always-on sensor nodes powered by coin cells |
| Efficiency (Peak) | 94% at 200mA, VOUT=3.3V, VIN=2.4V - minimizes thermal rise in sealed 2mm×2mm DFN package |
| Output Disconnect | True - eliminates body-diode leakage; VOUT drops to 0V in shutdown with no reverse current into VIN |
Pinout & Package
Package: 6-lead (2mm × 2mm × 0.75mm) plastic DFN with exposed pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance (θJA = 102°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; internal N-MOSFET drain and P-MOSFET source - must be routed short/wide to minimize EMI and switching losses |
| GND (Pins 2 & 7) | Signal and power ground | Pin 2 = signal GND; Pin 7 = exposed thermal pad - both must connect to low-impedance PCB ground plane |
| VIN (Pin 3) | Input supply | Accepts 0.5V–5V; requires ≥2.2µF ceramic decoupling capacitor placed adjacent to pin |
| SHDN (Pin 4) | Logic-controlled enable | Active-high; internal 4MΩ pull-down; drives <1µA shutdown current when pulled ≤0.3V |
| FB (Pin 5) | Feedback input | Senses resistive divider output; 1.195V reference sets VOUT = 1.195V × (1 + R1/R2); input bias <50nA |
| VOUT (Pin 6) | Regulated output / sync rectifier drain | Drain of internal P-MOSFET; connects to output capacitor (≥4.7µF); provides output disconnect capability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 680mV enables direct operation from single exhausted alkaline/NiMH cells without pre-bias circuits |
| Integrated soft-start | Ramps peak inductor current from 0 to 750mA over ~0.5ms - prevents inrush into heavy capacitive loads |
| Anti-ring control | Internal switch damps SW-node ringing during discontinuous conduction - reduces radiated EMI without external snubbers |
| True output disconnect | Eliminates reverse current path through P-MOSFET body diode - allows VOUT to fall to 0V and supports battery isolation |
| Thermal shutdown | Activates at TJ > 160°C; auto-restarts after ~15°C cooldown - protects against sustained overload or poor heatsinking |
Applications
| Wireless Peripherals | Noise-Sensitive Audio |
|---|---|
Use Scenario: Compact wireless mouse powered by single AAA cell with sleep-mode current <10µA. IC Role / Device Role / Timing Role: Step-up regulator providing stable 3.3V rail for RF transceiver and MCU during burst transmissions. Use Value: 680mV start-up extends usable battery life by >30% versus 0.9V-start competitors; Burst Mode maintains 9µA IQ during idle. | Use Scenario: Active noise-canceling (ANC) headphone requiring ultra-low-noise 2.85V supply for analog audio path. IC Role / Device Role / Timing Role: Fixed-frequency 2MHz boost converter powering op-amps and ADCs without introducing switching artifacts into audio band. Use Value: Low-noise PWM operation (LTC3526LB variant) avoids beat frequencies with audio clocks; 2MHz frequency places switching harmonics beyond 20kHz. |
| Portable Medical Sensors | Low-Power IoT Nodes |
Use Scenario: Disposable glucose monitor using single CR2032 coin cell with multi-year shelf life and 5-second measurement bursts. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 5V to optical sensor and BLE radio only during active measurement cycles. Use Value: Output disconnect prevents battery drain during storage; 94% peak efficiency minimizes voltage sag during 150mA pulse loads. | Use Scenario: Battery-powered environmental sensor node transmitting temperature/humidity data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Primary power supply generating 3.3V from 1.2–1.5V NiMH stack, supporting deep-sleep MCU and RF IC wake-up sequences. Use Value: 500mV operating floor enables full utilization of cell capacity; 9µA Burst Mode IQ extends 10-year battery life target. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 500mA max output, 0.3V start-up, no output disconnect, 0.9V–5.5V VOUT range | Lacks true output disconnect and anti-ring control; lower max current limits high-pulse applications | Select when lowest possible start-up voltage is critical and output isolation is not required |
| MAX17222ETA+T | 400mA max output, 0.4V start-up, integrated LDO post-regulator, no Burst Mode | Includes LDO for ultra-low-noise output but adds complexity and reduces efficiency at high load | Select when post-regulation ripple <10µV RMS is mandatory and 400mA peak suffices |
Compared with TPS61200DRCT and MAX17222ETA+T, the LTC3526LEDC-2#TRMPBF uniquely combines 680mV start-up, true output disconnect, and Burst Mode efficiency below 10µA - making it optimal for space-constrained, single-cell devices requiring long shelf life and clean shutdown behavior.
Availability
LTC3526LEDC-2#TRMPBF is available at Aetrix Electronics and suitable for wireless peripherals, portable medical sensors, noise-sensitive audio systems, and low-power IoT nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3526LEDC-2#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 and maintains its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LTC3526L-2 product line was designed specifically for ultra-low-voltage, battery-critical applications where start-up margin, shutdown isolation, and light-load efficiency determine system runtime and reliability.
FAQ
What is the minimum input voltage required for the LTC3526LEDC-2#TRMPBF to start up?
The LTC3526LEDC-2#TRMPBF has a guaranteed minimum start-up input voltage of 680mV (typical), enabling reliable operation from nearly depleted single-cell alkaline or NiMH batteries. Once started, it continues regulating down to 500mV input under light load conditions. This specification is verified across –40°C to 85°C and is enabled by an independent start-up oscillator circuit separate from the main 2MHz PWM engine.
Does the LTC3526LEDC-2#TRMPBF support true output disconnect, and how does it work?
Yes, the LTC3526LEDC-2#TRMPBF provides true output disconnect by actively controlling the gate of its internal P-channel synchronous rectifier to prevent body-diode conduction. During shutdown, VOUT falls to 0V with no reverse current into VIN - critical for battery isolation and zero-quiescent-storage designs. This feature requires no external components but is disabled if an external Schottky diode is added between SW and VOUT.
How does Burst Mode® operation improve efficiency in the LTC3526LEDC-2#TRMPBF?
Burst Mode® operation in the LTC3526LEDC-2#TRMPBF reduces quiescent current to 9µA (typical) at light loads by entering sleep cycles where all switches are off and only essential bias circuitry remains active. Energy is delivered in short 2MHz bursts until VOUT reaches regulation, then the IC sleeps until VOUT droops. This eliminates switching and gate-drive losses dominant at microamp loads - extending battery life in always-on sensor nodes far beyond fixed-frequency alternatives.
What is the function of the exposed pad (Pin 7) on the LTC3526LEDC-2#TRMPBF DFN package?
The exposed pad (Pin 7) on the LTC3526LEDC-2#TRMPBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB ground plane area using multiple thermal vias to achieve the specified θJA of 102°C/W. Failure to do so results in significantly higher junction temperatures, potential thermal shutdown activation, and reduced reliability - especially under continuous 550mA output conditions.
Can the LTC3526LEDC-2#TRMPBF regulate output voltages above the input voltage, and what are the limitations?
Yes, the LTC3526LEDC-2#TRMPBF supports VIN > VOUT operation (buck-boost mode) by reducing duty cycle, but efficiency drops sharply and maximum output current is limited by the 90% max duty cycle clamp and internal switch RDS(ON). For example, at VIN = 4.2V and VOUT = 3.3V, peak efficiency falls to ~82% and max sustainable current is ~300mA - making this mode suitable only for transient or backup scenarios, not primary regulation.
LTC3526LEDC-2#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:
- 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#TRMPBF FAQ
1.How can I place an order for LTC3526LEDC-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526LEDC-2#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-2#TRMPBF reliable?
The price and inventory of LTC3526LEDC-2#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-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3526LEDC-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526LEDC-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526LEDC-2#TRMPBF?
LTC3526LEDC-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526LEDC-2#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-2#TRMPBF?
For technical support, including LTC3526LEDC-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526LEDC-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3526LEDC-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526LEDC-2#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-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3526LEDC-2#TRMPBF?
All LTC3526LEDC-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526LEDC-2#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-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3526LEDC-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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