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Analog Devices Inc. LTC3526EDC-2#TRMPBF
- Part No.:
- LTC3526EDC-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3526EDC-2#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 500MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:266
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Product details
Overview
LTC3526EDC-2#TRMPBF from Analog Devices (formerly Linear Technology) is a synchronous, fixed-frequency step-up DC/DC converter with output disconnect, designed for ultra-low-voltage battery-powered systems. It delivers up to 200mA at 3.3V from two alkaline/NiMH cells, features 850mV start-up voltage, 2MHz switching, and operates down to 500mV input once started - enabling extended runtime in compact portable electronics.
For engineers reviewing the LTC3526EDC-2#TRMPBF datasheet, LTC3526EDC-2#TRMPBF pinout, LTC3526EDC-2#TRMPBF application, or LTC3526EDC-2#TRMPBF equivalent, key selection criteria include its Burst Mode® operation (9µA quiescent current), internal synchronous rectification, true output disconnect, anti-ringing control, and compatibility with tiny 2.2µH inductors and ceramic capacitors in space-constrained designs.
Technical Context
The LTC3526EDC-2#TRMPBF implements current-mode PWM control with internal slope compensation and adaptive loop response, enabling stable regulation across wide input (0.5V–5V) and output (1.6V–5.25V) ranges. Its 2MHz oscillator minimizes external passive size while maintaining tight line/load regulation without external compensation.
Burst Mode® operation dynamically toggles between full 2MHz switching and sleep mode (9µA IQ) based on load demand, preserving efficiency below ~5mA. Output disconnect is achieved via controlled P-channel MOSFET gate drive that eliminates body diode conduction during shutdown, ensuring zero reverse current and true VOUT collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to 5V - supports single-cell alkaline/NiMH (0.85V start-up) and Li-ion inputs without external boost assist |
| Output Voltage Range | 1.6V to 5.25V - programmable via external resistor divider; 3.3V typical for USB-peripheral rail generation |
| Switching Frequency | 2MHz ±20% - enables use of sub-3mm × 3mm inductors and 0402/0603 ceramic capacitors |
| Peak Switch Current Limit | 700mA typical - sets maximum deliverable power under low-VIN conditions; clamped at 90% duty cycle |
| Quiescent Current (Burst Mode) | 9µA - sustains >1-year shelf life in always-on sensor nodes powered by coin cells |
| Efficiency (Typical) | Up to 94% at 100mA - achieved via integrated N/P-channel MOSFETs with RDS(ON) of 0.4Ω/0.6Ω |
| Shutdown Current | <1µA - ensures zero-load battery drain during system sleep states |
Pinout & Package
The LTC3526EDC-2#TRMPBF is housed in a thermally enhanced 6-pin 2mm × 2mm × 0.75mm DFN package with exposed pad (Pin 7) requiring solder connection to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to inductor; internal N-MOSFET drain - must be routed short/wide to minimize EMI and switching losses |
| GND (Pin 2) | Signal & Power Ground | Primary reference for error amplifier and current sense; requires low-impedance path to input/output capacitor negatives |
| VIN (Pin 3) | Input Supply | Accepts 0.5V–5V source; requires ≥1µF ceramic decoupling placed adjacent to pin |
| SHDN (Pin 4) | Logic-Controlled Enable | Active-high input with 4MΩ internal pull-down; drives <1µA shutdown current when pulled low |
| FB (Pin 5) | Feedback Input | Monitors resistive divider output; regulates VOUT to 1.195V reference - sets output voltage per VOUT = 1.195V × (1 + R1/R2) |
| VOUT (Pin 6) | Output Sense & Rectifier Drain | Drain of internal P-MOSFET synchronous rectifier; connects directly to output capacitor anode |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains 9µA quiescent current at light loads while retaining 2MHz regulation accuracy - critical for battery longevity in intermittent-sensing devices |
| True Output Disconnect | Eliminates reverse current flow through internal P-MOSFET body diode during shutdown - prevents battery discharge and enables safe hot-swap of power rails |
| Anti-Ringing Control | Internally damps SW-node resonance in discontinuous conduction mode - reduces radiated EMI without external snubbers |
| Integrated Soft-Start | Ramps peak inductor current from 0 to 700mA over ~0.5ms - prevents inrush into large output capacitance or heavy loads |
| Low-VIN Start-Up | Independent oscillator initiates regulation at 0.85V VIN - enables operation from nearly-dead primary cells where other boosters fail |
Applications
| Medical Instrument Power | Noise-Canceling Headphone Supply |
|---|---|
Use Scenario: Portable glucose meters and handheld pulse oximeters powered by single AAA batteries requiring regulated 3.3V for MCU and analog front-end. IC Role / Device Role / Timing Role: Primary step-up regulator delivering 150mA at 3.3V with <1µA shutdown leakage to maximize battery shelf life. Use Value: 850mV start-up allows full functionality until cell voltage drops below 0.8V - extending usable battery life by >25% vs. competing boosters. | Use Scenario: Active noise-canceling (ANC) headphones using dual alkaline cells to power DSP, op-amps, and Bluetooth radio. IC Role / Device Role / Timing Role: Generates clean 1.8V/3.3V rails with low ripple and minimal conducted EMI to avoid audible artifacts in audio path. Use Value: 2MHz fixed-frequency operation and anti-ringing circuitry suppress switching noise above 20kHz - eliminating beat frequencies in sensitive audio circuits. |
| Wireless Mouse Core Supply | Bluetooth Headset Voltage Booster |
Use Scenario: Ultra-thin optical mice with space-limited PCBs and coin-cell or AA power, needing 3.3V for RF transceiver and sensor IC. IC Role / Device Role / Timing Role: Compact 2mm × 2mm DFN regulator delivering 100mA with integrated soft-start to prevent brownout during wake-from-sleep transitions. Use Value: Internal compensation and 2.2µH inductor support enable complete solution footprint under 12mm² - meeting strict mechanical height constraints. | Use Scenario: Miniature Bluetooth headsets powered by single NiMH cell (0.9–1.4V), requiring stable 3.3V for BT SoC and microphone bias. IC Role / Device Role / Timing Role: High-efficiency boost converter operating down to 0.5V input after startup, with output disconnect to isolate battery during charging. Use Value: True output disconnect prevents reverse current into charging circuitry - enabling safe simultaneous charge-and-use operation without external isolation FETs. |
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 |
|---|---|---|---|
| LTC3526BEDC-2#TRMPBF | Continuous 2MHz PWM (no Burst Mode); lower light-load IQ (~250µA active) but no 9µA sleep state | Better suited for constant-load audio codecs or sensors requiring ultra-low output ripple | Select when low-noise fixed-frequency operation outweighs battery life optimization |
| TPS61200DRCT | 0.3V start-up; 0.9V–5.5V input; 1.8V–5.5V output; 600mA limit; no output disconnect | Lacks true output disconnect and anti-ringing - requires external Schottky for higher efficiency but sacrifices reverse-current blocking | Choose for wider VIN range and higher current, accepting trade-offs in shutdown leakage and EMI control |
Compared with LTC3526BEDC-2#TRMPBF and TPS61200DRCT, the LTC3526EDC-2#TRMPBF uniquely balances ultra-low start-up voltage, Burst Mode efficiency, and output disconnect in a 2mm × 2mm footprint - making it optimal for intermittent-duty, battery-critical portable devices where every microamp and millimeter matters.
Availability
LTC3526EDC-2#TRMPBF is available at Aetrix Electronics and suitable for medical instrumentation, wireless peripherals, audio accessories, and Bluetooth wearables requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC3526EDC-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 high-performance analog and power management portfolio with rigorous automotive-grade qualification and long-term product support.
The LTC3526EDC-2#TRMPBF belongs to Linear's ultra-low-voltage DC/DC converter family, engineered specifically for energy-constrained portable electronics where start-up from near-dead batteries and micropower shutdown are mandatory design requirements.
FAQ
What is the minimum input voltage required to start up the LTC3526EDC-2#TRMPBF?
The LTC3526EDC-2#TRMPBF starts up at a guaranteed 0.85V (typical 0.85V, max 1.0V) with 1mA load, enabled by an independent start-up oscillator. Once running, it continues operation down to 0.5V input - a capability critical for extracting maximum energy from aging alkaline or NiMH cells. This start-up threshold is verified across –40°C to 85°C.
Does the LTC3526EDC-2#TRMPBF support output voltages other than 3.3V?
Yes, the LTC3526EDC-2#TRMPBF supports adjustable output from 1.6V to 5.25V using an external resistor divider on the FB pin. The feedback reference is precisely 1.195V (±30mV), allowing accurate programming - for example, 1.8V for low-power logic or 5V for USB-peripheral interfaces. The formula is VOUT = 1.195V × (1 + R1/R2).
How does Burst Mode® operation affect output voltage ripple on the LTC3526EDC-2#TRMPBF?
In Burst Mode®, the LTC3526EDC-2#TRMPBF delivers energy in discrete packets, causing typical 1% peak-to-peak output ripple. This can be reduced by increasing output capacitance (≥10µF ceramic) or adding a 10pF–50pF capacitor from VOUT to FB. Unlike pulse-skipping converters, it retains 2MHz regulation accuracy during bursts - eliminating mode-transition transients.
Can the LTC3526EDC-2#TRMPBF operate with input voltage higher than the programmed output voltage?
Yes, the LTC3526EDC-2#TRMPBF maintains regulation even when VIN exceeds VOUT (e.g., 4.2V Li-ion input to 3.3V output). In this mode, efficiency drops significantly and maximum output current is reduced due to increased duty-cycle limitations and conduction losses - refer to the "VIN > VOUT Operation" section of the datasheet for derating curves.
What is the role of the exposed pad (Pin 7) on the LTC3526EDC-2#TRMPBF DFN package?
The exposed pad (Pin 7) on the LTC3526EDC-2#TRMPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 102°C/W; failure to do so raises thermal resistance substantially, risking thermal shutdown under sustained 200mA loads. It also serves as a low-inductance return path for high-frequency switch currents.
LTC3526EDC-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):
- 1.6V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 500mA (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)
LTC3526EDC-2#TRMPBF FAQ
1.How can I place an order for LTC3526EDC-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3526EDC-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 LTC3526EDC-2#TRMPBF reliable?
The price and inventory of LTC3526EDC-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 LTC3526EDC-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3526EDC-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3526EDC-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3526EDC-2#TRMPBF?
LTC3526EDC-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3526EDC-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 LTC3526EDC-2#TRMPBF?
For technical support, including LTC3526EDC-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3526EDC-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3526EDC-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3526EDC-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 LTC3526EDC-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3526EDC-2#TRMPBF?
All LTC3526EDC-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3526EDC-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 LTC3526EDC-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3526EDC-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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