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Analog Devices Inc. LTC3525DISC6-3.3
- Part No.:
- LTC3525DISC6-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525DISC6-3.3.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,274
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Product details
Overview
LTC3525DISC6-3.3 from Analog Devices (formerly Linear Technology) is a micropower synchronous step-up DC/DC converter optimized for single-cell alkaline/NiMH or Li-Ion battery-powered systems. It starts up from as low as 0.85V input, delivers fixed 3.3V output with pass-through mode in shutdown, and achieves up to 95% efficiency while drawing only 7µA quiescent current - enabling multi-year battery life in glucose meters and portable instrumentation.
For engineers reviewing the LTC3525DISC6-3.3 datasheet, LTC3525DISC6-3.3 pinout, LTC3525DISC6-3.3 application, or LTC3525DISC6-3.3 equivalent, key selection criteria include its 0.85V start-up voltage, SC70-6 package footprint, pass-through mode behavior, 400mA peak switch current capability, and Burst Mode® operation for ultra-low-light-load efficiency.
Technical Context
The LTC3525DISC6-3.3 employs a hysteretic burst-mode control architecture with adaptive peak/valley inductor current regulation. Its internal 0.5Ω N-channel MOSFET and 0.8Ω P-channel synchronous rectifier enable high-efficiency boost conversion without external diodes, while anti-ringing circuitry minimizes EMI at the SW node.
During startup, it uses a dedicated oscillator to bootstrap from sub-1V inputs; once VOUT exceeds VIN by ≥0.2V and either rail reaches ≥1.8V, it transitions to normal synchronous operation. In shutdown, the P-channel switch closes to connect VIN to VOUT through the inductor - a true pass-through mode distinct from output disconnect variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Start-Up Voltage | 0.85V minimum - enables reliable startup from single alkaline or NiMH cells at end-of-life. |
| Fixed Output Voltage | 3.3V ±3% (3.20–3.40V) - tightly regulated for powering 3.3V microcontrollers and sensors. |
| Quiescent Current | 7µA typical in Burst Mode® - extends battery life in always-on portable devices like glucose meters. |
| Peak Switch Current | 400mA - supports up to 140mA output at 3.3V from 1.8V input, enabling compact inductor selection. |
| Operating Junction Temp | –40°C to 125°C - qualified for industrial and automotive-adjacent embedded applications. |
| Package | 6-Lead SC70 (1.8 × 1.2 mm, 1.0 mm height) - ultra-small footprint for space-constrained PCBs. |
| Shutdown Threshold | 0.4V to 0.6V (SHDN pin) - provides clean, low-voltage logic-compatible enable/disable control. |
Pinout & Package
Package: 6-Lead Plastic SC70 (SC6), 1.8 mm × 1.2 mm × 1.0 mm profile, lead-free, –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pull below 0.4V to enable pass-through mode; pull above 1V to activate converter; avoids test mode when held < (VIN + 0.4V). |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins reduce ground impedance and improve thermal dissipation in high-current switching paths. |
| VIN (Pin 3) | Main Input Power Supply | Accepts 0.5V–4.5V; powers IC until VOUT > VIN + 0.2V, then switches to VOUT supply - enabling efficient VIN ≥ VOUT operation. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers fixed 3.3V; connects directly to output capacitor (min. 10µF ceramic); enables pass-through via internal P-FET when SHDN is low. |
| SW (Pin 6) | Switch Node | Drives external inductor; integrates antiringing resistor to suppress LC ringing and reduce EMI without external snubbers. |
Key Features
| Feature | Design Value |
|---|---|
| Pass-Through Mode in Shutdown | VIN connected directly to VOUT through inductor - maintains system power rail continuity during sleep without external FETs. |
| Adaptive Peak Inductor Current | Automatically scales from 150mA (light load) to 400mA (full load) - maximizes efficiency across dynamic load ranges. |
| Burst Mode® Operation | 7µA IQ with zero-load regulation - eliminates switching losses at light loads while maintaining tight output voltage accuracy. |
| Integrated Synchronous Rectification | 0.5Ω NMOS + 0.8Ω PMOS switches - replaces lossy Schottky diode, enabling >90% efficiency even at 10mA loads. |
| Anti-Ringing Control | Internal resistor across SW–VIN - damps switch-node oscillation at zero-current crossing, reducing conducted EMI and layout sensitivity. |
Applications
| Glucose Meters | Portable Instrumentation |
|---|---|
|
Use Scenario: Battery-powered handheld medical device requiring stable 3.3V rail from single AA/AAA alkaline cell with multi-year shelf life. IC Role / Device Role / Timing Role: Primary voltage booster delivering regulated 3.3V to MCU, sensor interface, and LCD driver during active measurement cycles. Use Value: 0.85V start-up ensures operation down to 0.9V cell voltage; 7µA quiescent current enables >5-year battery life in standby. |
Use Scenario: Handheld test equipment powered by dual NiMH cells, needing low-noise 3.3V supply for precision ADCs and RF front-ends. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter supplying clean 3.3V rail with minimal ripple (<60mVpp at full load) and no audible switching noise. Use Value: Burst Mode® eliminates sub-audible switching tones; SC70-6 package allows integration into <10 cm² PCB area. |
| MP3 Players | Digital Cameras |
|
Use Scenario: Portable audio player using single Li-Ion cell (2.7–4.2V) to power 3.3V DSP, flash memory, and audio codec. IC Role / Device Role / Timing Role: Step-up converter maintaining constant 3.3V output across full battery discharge curve, including VIN ≥ VOUT regions. Use Value: Pass-through mode preserves VOUT during deep sleep; synchronous rectification sustains >92% efficiency even at 1.8V input. |
Use Scenario: Compact digital camera requiring fast wake-up from shutdown with immediate 3.3V rail availability for image sensor and processor. IC Role / Device Role / Timing Role: Boost converter with <120µs startup delay after SHDN release - enables rapid system boot from ultra-low-power state. Use Value: 20–120µs enable delay ensures deterministic timing; SC70 package fits within tight camera module height constraints (≤1mm). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3429EDC-3.3#TRMPBF | Same SC70-6 package, 600mA peak current, output disconnect (not pass-through), 20µA IQ. | Requires external path for VIN-to-VOUT continuity in shutdown; better suited for systems needing true output isolation. | Select LTC3429 when output disconnect is mandatory and higher peak current justifies 13µA higher quiescent current. |
| LTC3528EDC-3.3#TRMPBF | 2mm × 3mm DFN-8, 1A peak current, 700mV start-up, output disconnect, 12µA IQ. | Larger footprint and no pass-through mode; optimized for higher output current and lower input voltage than LTC3525DISC6-3.3. | Choose LTC3528 for designs needing >140mA continuous output or sub-0.85V startup - but only if SC70 size constraint is relaxed. |
Compared with LTC3429 and LTC3528, the LTC3525DISC6-3.3 uniquely combines SC70-6 size, 0.85V start-up, 7µA IQ, and integrated pass-through mode - making it optimal for ultra-compact, long-life battery systems where VIN-to-VOUT continuity during sleep is critical.
Availability
LTC3525DISC6-3.3 is available at Aetrix Electronics and suitable for glucose meters, portable instrumentation, MP3 players, and digital cameras requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3525DISC6-3.3 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, manufacturing, and documentation for all Linear legacy parts including the LTC3525 series.
The LTC3525 family was designed specifically for micropower, space-constrained battery-powered applications - emphasizing ultra-low IQ, minimal external components, and robust startup from depleted primary cells.
FAQ
What is the minimum input voltage required for the LTC3525DISC6-3.3 to start switching?
The LTC3525DISC6-3.3 requires a minimum input voltage of 0.85V to initiate startup. Once operational, it can sustain regulation down to 0.5V input depending on load current. This capability enables reliable use with single alkaline or NiMH cells throughout their full discharge cycle. The LTC3525DISC6-3.3 achieves this via an internal start-up oscillator and specialized low-voltage bias circuitry.
Does the LTC3525DISC6-3.3 support input voltages higher than its 3.3V output?
Yes, the LTC3525DISC6-3.3 supports VIN ≥ VOUT operation - for example, delivering 3.3V output from a 3.6V Li-Ion cell. In this mode, the synchronous rectifier is disabled, resulting in reduced efficiency and lower maximum output current compared to boost operation. The LTC3525DISC6-3.3 remains functional and regulated, but designers should verify load requirements under VIN ≥ VOUT conditions using the efficiency curves in the datasheet.
How does the pass-through mode function in the LTC3525DISC6-3.3 during shutdown?
When the SHDN pin is pulled below 0.4V, the LTC3525DISC6-3.3 disables switching and turns on its internal P-channel MOSFET, connecting VIN directly to VOUT through the external inductor. This pass-through mode maintains power continuity to downstream circuitry without requiring additional components. Unlike output disconnect variants, the LTC3525DISC6-3.3 does not isolate VOUT from VIN in shutdown - a key differentiator confirmed in the "List of LTC3525 Options" table.
What is the recommended output capacitor value for the LTC3525DISC6-3.3?
The minimum recommended output capacitor for the LTC3525DISC6-3.3 is 10µF ceramic (X5R or X7R dielectric). Using 22µF reduces output ripple from ~60mVpp to ~20mVpp at full load. Capacitors larger than 47µF increase light-load peak inductor current unnecessarily, degrading Burst Mode® efficiency. The LTC3525DISC6-3.3 datasheet explicitly warns against exceeding 47µF for optimal IQ performance.
Is the LTC3525DISC6-3.3 pin-compatible with other variants in the LTC3525 family?
No - the LTC3525DISC6-3.3 is not pin-compatible with LTC3525-3.3 or LTC3525L-3.3. While all share the SC70-6 package, the LTC3525D variant implements pass-through mode, whereas the standard and L-grade variants provide output disconnect. Their SHDN behavior, internal switch configuration, and functional pin definitions differ. Substituting them without circuit review risks incorrect shutdown behavior or failure to regulate.
LTC3525DISC6-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.5V
- Voltage - Input (Max):
- 4.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 140mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
LTC3525DISC6-3.3 FAQ
1.How can I place an order for LTC3525DISC6-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525DISC6-3.3 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 LTC3525DISC6-3.3 reliable?
The price and inventory of LTC3525DISC6-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525DISC6-3.3 is usually 5 days.
3.What payment methods are accepted for LTC3525DISC6-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525DISC6-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525DISC6-3.3?
LTC3525DISC6-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525DISC6-3.3 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 LTC3525DISC6-3.3?
For technical support, including LTC3525DISC6-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525DISC6-3.3 requirements.
6.How does Aetrix verify that LTC3525DISC6-3.3 is sourced from the original manufacturer or authorized distributors?
All LTC3525DISC6-3.3 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 LTC3525DISC6-3.3 meets industry standards.
7.What is the process for return or replacement of LTC3525DISC6-3.3?
All LTC3525DISC6-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525DISC6-3.3, 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 LTC3525DISC6-3.3 part is unused and in its original packaging.
Return procedure for LTC3525DISC6-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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