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Analog Devices Inc. LTC3525DESC6-3.3
- Part No.:
- LTC3525DESC6-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525DESC6-3.3.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,944
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Product details
Overview
LTC3525DESC6-3.3 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 systems. It starts up from 0.85V input, delivers fixed 3.3V output with pass-through mode in shutdown, and achieves up to 95% efficiency delivering 140mA at 3.3V from 1.8V input - ideal for glucose meters and portable instrumentation.
For engineers reviewing the LTC3525DESC6-3.3 datasheet, LTC3525DESC6-3.3 pinout, LTC3525DESC6-3.3 application, or LTC3525DESC6-3.3 equivalent, key selection criteria include ultralow 7µA quiescent current, SC70-6 package footprint, pass-through mode behavior, 400mA peak switch current capability, and guaranteed operation from –40°C to 85°C junction temperature.
Technical Context
The LTC3525DESC6-3.3 employs Burst Mode® operation with hysteretic control to maintain regulation at light loads while minimizing quiescent current. Its internal architecture integrates a 0.5Ω N-channel MOSFET switch and 0.8Ω P-channel synchronous rectifier, enabling high-efficiency boost conversion without external diodes.
During shutdown, the P-channel MOSFET turns on, connecting VIN to VOUT through the inductor - a true pass-through mode distinct from output disconnect variants. Startup requires only three external components (inductor, input capacitor, output capacitor), and the device supports VIN ≥ VOUT operation with reduced efficiency due to disabled synchronous rectification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Start-Up Voltage | 0.85V minimum - enables operation from single alkaline or NiMH cell at end-of-life voltage. |
| Fixed Output Voltage | 3.3V ±3% - internally trimmed, eliminating external feedback resistors and saving board space. |
| Quiescent Current | 7µA typical - 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 with >90% efficiency. |
| Operating Junction Temp | –40°C to 85°C - qualified for industrial and medical portable equipment environments. |
| Package | 6-Lead SC70 (SC6) - 2.0mm × 1.25mm footprint, 1.0mm max height, compatible with automated SMT assembly. |
| Shutdown Threshold | 0.4V to 0.6V - logic-compatible low-voltage shutdown with <1µA input leakage. |
Pinout & Package
Package: 6-Lead Plastic SC70 (SC6), 2.0mm × 1.25mm body, 1.0mm maximum height, JEDEC MO-203 AB, EIAJ SC-70.
| 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 switching; avoids test mode when kept ≤ (VIN + 0.4V). |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins reduce PCB trace inductance and improve thermal dissipation in compact layouts. |
| VIN (Pin 3) | Main Power Input | Accepts 0.5V–4.5V; powers IC until VOUT exceeds VIN by 0.2V, then switches to VOUT supply path. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers fixed 3.3V; connects directly to output capacitor; enables pass-through via internal P-MOSFET during shutdown. |
| SW (Pin 6) | Switch Node | Drives external inductor; includes integrated anti-ringing resistor to suppress EMI at zero-current crossing. |
Key Features
| Feature | Design Value |
|---|---|
| Pass-Through Mode in Shutdown | VIN connected directly to VOUT via internal P-channel MOSFET - maintains system rail continuity without external bypass path. |
| Burst Mode® Operation | 7µA quiescent current with automatic burst frequency scaling - eliminates audible noise while preserving light-load efficiency. |
| Adaptive Peak Current Control | Inductor peak current scales from 150mA (light load) to 400mA (heavy load) - optimizes conduction loss vs. ripple trade-off. |
| Integrated Anti-Ringing Circuit | Internal resistor across SW and VIN at zero-current - reduces EMI without requiring external snubber components. |
| Thermal Shutdown Protection | Activates at 125°C junction temperature - prevents damage during sustained overload or poor heatsinking. |
Applications
| Glucose Meters | Portable Instrumentation |
|---|---|
Use Scenario: Battery-powered handheld medical device requiring stable 3.3V rail from single AA/AAA alkaline cell with >5-year shelf life. IC Role / Device Role / Timing Role: Primary voltage booster maintaining regulated 3.3V for microcontroller, sensor interface, and LCD driver during full discharge curve (0.85V–1.6V input). Use Value: 7µA quiescent current minimizes standby drain; pass-through mode preserves real-time clock backup during shutdown. | Use Scenario: Field-deployable data logger powered by dual NiMH cells, operating intermittently over multi-week cycles. IC Role / Device Role / Timing Role: Efficient step-up converter supplying 3.3V to RF transceiver and ADC during active bursts, then entering ultra-low-power sleep. Use Value: 95% peak efficiency at 100mA load extends operational time; SC70-6 package enables compact 2-layer PCB design. |
| Digital Cameras (Low-Power Mode) | MP3 Players (Battery Backup Rail) |
Use Scenario: Compact digital camera using single Li-Ion cell where display backlight and image sensor require clean 3.3V during preview mode. IC Role / Device Role / Timing Role: Synchronous boost regulator powering CMOS image sensor interface and SD card controller with low output ripple. Use Value: 20mVpp ripple at light load ensures signal integrity; anti-ringing control prevents EMI interference with image capture circuitry. | Use Scenario: Portable audio player with flash memory requiring uninterrupted 3.3V supply during battery swap or deep discharge. IC Role / Device Role / Timing Role: Pass-through enabled voltage translator maintaining VOUT = VIN during shutdown to preserve SRAM contents and real-time clock. Use Value: Eliminates need for external diode-or or LDO backup path - reduces BOM count and PCB area by 30%. |
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 |
|---|---|---|---|
| LTC3525-3.3 | Output disconnect in shutdown (not pass-through); same 3.3V output, 0.85V start-up, and SC70-6 package. | Requires external diode for rail continuity during shutdown; unsuitable where VIN-to-VOUT continuity is mandatory. | Select LTC3525DESC6-3.3 when pass-through functionality is required; choose LTC3525-3.3 only if output isolation during shutdown is preferred. |
| LTC3429 | Same SC70-6 package and 3.3V option; includes output disconnect, higher 500kHz switching frequency, but no pass-through mode. | Higher IQ (20µA) and lower peak current (600mA) - less suitable for 140mA continuous loads at low input voltages. | LTC3429 offers better transient response for pulsed loads but cannot replace LTC3525DESC6-3.3 in pass-through-critical designs. |
Compared with LTC3525-3.3 and LTC3429, the LTC3525DESC6-3.3 uniquely provides VIN-to-VOUT continuity during shutdown - a critical requirement for systems needing uninterrupted backup power, whereas alternatives prioritize output isolation or higher-frequency operation at the expense of pass-through capability.
Availability
LTC3525DESC6-3.3 is available at Aetrix Electronics and suitable for glucose meters, portable instrumentation, digital cameras, and MP3 players requiring stable component supply with long-term industrial temperature support.
Supply support for LTC3525DESC6-3.3 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 technical and manufacturing continuity for all Linear power management products.
The LTC3525D family was designed specifically for ultra-low-power, space-constrained portable electronics requiring high-efficiency boost conversion from single- or dual-cell batteries - emphasizing micropower operation, minimal external components, and robust startup capability.
FAQ
What is the shutdown behavior of the LTC3525DESC6-3.3?
The LTC3525DESC6-3.3 enters pass-through mode when SHDN is pulled below 0.4V: its internal P-channel MOSFET turns on, connecting VIN directly to VOUT through the inductor. This maintains output voltage continuity without external components. Unlike LTC3525-3.3, it does not disconnect VOUT in shutdown - a key differentiator confirmed in the "List of LTC3525 Options" table and Pin Functions section.
Does the LTC3525DESC6-3.3 require an external Schottky diode?
No, the LTC3525DESC6-3.3 does not require an external Schottky diode. It integrates both an N-channel MOSFET switch and a P-channel synchronous rectifier, enabling high-efficiency boost conversion without external diode losses. This is explicitly stated in the "Description" section and confirmed by the block diagram showing internal gate drivers and synchronous rectification logic.
What is the minimum recommended output capacitor for the LTC3525DESC6-3.3?
The minimum recommended output capacitor for the LTC3525DESC6-3.3 is 10µF ceramic (X5R or X7R dielectric), placed close to the VOUT and GND pins. Using 22µF reduces output ripple further, but values above 47µF degrade light-load efficiency by forcing higher-than-necessary peak inductor current. This guidance is specified in the "Component Selection" section and validated in ripple performance curves.
Can the LTC3525DESC6-3.3 operate with input voltage equal to or greater than output voltage?
Yes, the LTC3525DESC6-3.3 can operate with VIN ≥ VOUT (e.g., 3.3V input to 3.3V output), but in this mode the synchronous rectifier is disabled, reducing efficiency and output current capability. The device remains functional and regulated, as confirmed in the "Operation" section under "VIN ≥ VOUT Operation", though peak current drops and conduction losses increase.
What is the thermal resistance (θJA) of the LTC3525DESC6-3.3 in standard layout?
The LTC3525DESC6-3.3 has θJA = 150°C/W when mounted on a PCB with a ground plane, per the Absolute Maximum Ratings table. In free air, θJA is 256°C/W. These values are measured per JEDEC standards and define the thermal derating needed to maintain junction temperature ≤125°C under load - critical for reliability in sealed portable enclosures.
LTC3525DESC6-3.3 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
LTC3525DESC6-3.3 FAQ
1.How can I place an order for LTC3525DESC6-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525DESC6-3.3 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 LTC3525DESC6-3.3 reliable?
The price and inventory of LTC3525DESC6-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525DESC6-3.3 is usually 5 days.
3.What payment methods are accepted for LTC3525DESC6-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525DESC6-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525DESC6-3.3?
LTC3525DESC6-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525DESC6-3.3 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 LTC3525DESC6-3.3?
For technical support, including LTC3525DESC6-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525DESC6-3.3 requirements.
6.How does Aetrix verify that LTC3525DESC6-3.3 is sourced from the original manufacturer or authorized distributors?
All LTC3525DESC6-3.3 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 LTC3525DESC6-3.3 meets industry standards.
7.What is the process for return or replacement of LTC3525DESC6-3.3?
All LTC3525DESC6-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525DESC6-3.3, 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 LTC3525DESC6-3.3 part is unused and in its original packaging.
Return procedure for LTC3525DESC6-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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