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Analog Devices Inc. LTC3525ISC6-3#TRMPBF
- Part No.:
- LTC3525ISC6-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525ISC6-3#TRMPBF.pdf
- Description:
- IC REG BOOST 3V 65MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:477
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Product details
Overview
LTC3525ISC6-3#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower synchronous step-up DC/DC converter with output disconnect, designed for single-cell alkaline/NiMH or Li-Ion battery-powered systems. It delivers up to 65mA at 3V from a 1V input, features 7µA quiescent current, 0.85V minimum start-up voltage, and operates in Burst Mode® for ultra-low-power regulation.
For engineers reviewing the LTC3525ISC6-3#TRMPBF datasheet, LTC3525ISC6-3#TRMPBF pinout, LTC3525ISC6-3#TRMPBF application, or LTC3525ISC6-3#TRMPBF equivalent, key selection criteria include input start-up capability below 1V, true output disconnect during shutdown, thermal shutdown protection, SC70-6 package compatibility, and fixed 3V output with ±3% tolerance over temperature.
Technical Context
The LTC3525ISC6-3#TRMPBF uses a hysteretic burst-mode control architecture with adaptive peak/valley inductor current modulation - reducing peak current to 150mA at light loads and scaling up to 400mA under full load to optimize efficiency across operating conditions. Its internal 0.5Ω N-channel MOSFET switch and 0.8Ω P-channel synchronous rectifier enable high-efficiency boost conversion without external diodes.
Startup is managed by a dedicated oscillator enabling operation from 0.85V input; once VOUT exceeds VIN by ≥0.2V and either rail reaches ≥1.8V, it transitions to normal synchronous operation. Output disconnect is implemented via gate control of the P-channel rectifier, ensuring zero-load leakage and eliminating inrush current during power-up or shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.00V ±3% (2.91V–3.09V) over –40°C to 125°C junction range - ensures stable rail for low-voltage microcontrollers and sensors. |
| Input Start-Up Voltage | 0.85V minimum - enables reliable startup from single alkaline/NiMH cells even at end-of-life discharge. |
| Quiescent Current (VIN) | 7µA typical - maximizes battery runtime in always-on portable instrumentation and glucose meters. |
| Peak Switch Current | 400mA maximum - supports ≥65mA output at 3V from 1V input while maintaining regulation under load transients. |
| Shutdown Current | <1µA - guarantees near-zero system standby drain when powered off, critical for medical and IoT edge devices. |
| Package | 6-Lead SC70 (1.8mm × 1.3mm × 1.0mm) - enables ultra-compact PCB layouts in space-constrained wearables and handhelds. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and automotive cabin applications requiring extended thermal robustness. |
Pinout & Package
Package: 6-Lead Plastic SC70 (JEDEC MO-203 AB, EIAJ SC-70), 1.0mm max height, lead-free finish, –40°C to +125°C operating junction temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pulled high (>1V) to enable; pulled low (<0.4V) to disable with true output disconnect and <1µA shutdown current. |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins reduce ground impedance and improve noise immunity in high-frequency switching operation. |
| VIN (Pin 3) | Main Input Power Supply | Accepts 0.85V–6V; powers IC until VOUT > VIN + 0.2V, then switches to VOUT supply path for higher efficiency. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers fixed 3V output; connects directly to output capacitor; provides feedback for regulation and enables output disconnect. |
| SW (Pin 6) | Switch Node | Connects to inductor; integrates antiringing circuit to damp oscillation at zero-current crossing and reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | 7µA quiescent current enables >90% efficiency at 100µA load - extends battery life in intermittent-sensing applications. |
| True Output Disconnect | Zero-load leakage from VOUT to VIN during shutdown - eliminates parasitic discharge paths in multi-rail systems. |
| Adaptive Peak Current Limit | 150mA to 400mA dynamic scaling - balances conduction loss vs. switching loss across 100nA–65mA load range. |
| Integrated Antiringing Control | Internal resistor across SW–VIN damps LC ringing at switch turn-off - reduces radiated emissions without external snubbers. |
| Thermal Shutdown Protection | Activates above 125°C junction temperature - prevents damage during sustained overload or poor heatsinking. |
Applications
| Portable Medical Sensors | Low-Power Wearables |
|---|---|
Use Scenario: Glucose meter or pulse oximeter powered by a single AAA alkaline cell. IC Role / Device Role / Timing Role: Step-up converter generating stable 3V rail for analog front-end and MCU from decaying 0.9–1.5V battery. Use Value: 0.85V start-up and 7µA IQ ensure full device functionality down to battery end-of-life, extending usable runtime by >30%. |
Use Scenario: Fitness tracker with OLED display and BLE radio operating on coin-cell or thin-film battery. IC Role / Device Role / Timing Role: Primary 3V power source enabling simultaneous sensor acquisition and wireless transmission bursts. Use Value: Output disconnect prevents battery drain during sleep mode; 65mA output supports brief display backlight activation without brownout. |
| Industrial Handheld Instruments | Smart Remote Controls |
Use Scenario: Ruggedized multimeter or environmental sensor logger using dual NiMH cells. IC Role / Device Role / Timing Role: Regulated 3V supply for precision ADC, op-amps, and flash memory across wide temperature range. Use Value: –40°C to +125°C qualification ensures accuracy retention in cold storage or hot factory environments; SC70 footprint saves board area. |
Use Scenario: IR/RF universal remote with touch interface and motion sensing, powered by two AA cells. IC Role / Device Role / Timing Role: Efficient 3V generation for capacitive touch controller and low-power MCU during button press events. Use Value: Burst Mode® delivers instantaneous current for wake-up without voltage sag; <1µA shutdown current preserves shelf life >1 year. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3529EDD#TRMPBF | Higher 1.5A peak current, 1.5MHz fixed-frequency PWM, no Burst Mode®, requires external compensation. | Designed for higher-output-current applications (e.g., 3.3V/300mA); less suitable for µA-level standby power budgets. | Select LTC3529EDD#TRMPBF only if >100mA continuous output and tighter output ripple are required - not for ultra-low-IQ designs. |
| LTC3429ESC6#TRMPBF | Same SC70-6 package, 600mA peak current, 500kHz switching, fixed 3.3V/5V options only - no 3V variant. | Supports dual-cell alkaline inputs up to 3.2V; lacks 0.85V start-up - cannot operate from deeply discharged single-cell sources. | Choose LTC3429ESC6#TRMPBF for higher current needs where input stays >1.2V; avoid when 3V output or sub-1V start-up is mandatory. |
Compared with LTC3525ISC6-3#TRMPBF, LTC3529EDD#TRMPBF trades ultra-low IQ for higher output capability and lower ripple, while LTC3429ESC6#TRMPBF offers greater current headroom but sacrifices deep-discharge compatibility and fixed-3V output.
Availability
LTC3525ISC6-3#TRMPBF is available at Aetrix Electronics and suitable for portable medical sensors, low-power wearables, industrial handheld instruments, and smart remote controls requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3525ISC6-3#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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC3525 family.
The LTC3525 series was designed specifically for ultra-low-power, single-cell battery-powered applications demanding high efficiency at microamp loads and true output isolation - targeting portable instrumentation, medical diagnostics, and energy-harvesting interfaces.
FAQ
What is the minimum input voltage required for LTC3525ISC6-3#TRMPBF to start switching?
The LTC3525ISC6-3#TRMPBF starts switching with an input voltage as low as 0.85V, enabled by its dedicated start-up oscillator. This allows reliable operation from a single alkaline or NiMH cell even at end-of-life voltage. Once started, it can maintain regulation down to ~0.5V depending on load current, per the datasheet's "Maximum Startup Load vs VIN" curve.
Does LTC3525ISC6-3#TRMPBF provide true output disconnect during shutdown?
Yes, LTC3525ISC6-3#TRMPBF provides true output disconnect: when SHDN is pulled below 0.4V, the internal P-channel synchronous rectifier is fully turned off, isolating VOUT from VIN. This results in <1µA shutdown current and prevents battery drain through downstream circuitry - confirmed in the "Output Disconnect and Inrush Current Limit" feature list and Pin Functions section.
What is the maximum continuous output current achievable with LTC3525ISC6-3#TRMPBF at 3V output?
The LTC3525ISC6-3#TRMPBF delivers up to 65mA continuously at 3V output when supplied from a 1V input, as specified in the "Features" section. At higher input voltages (e.g., 1.8V), output current increases - up to 140mA at 3.3V output (LTC3525-3.3 variant). The 400mA peak switch current limit and thermal design constrain practical continuous output based on ambient temperature and PCB layout.
Can LTC3525ISC6-3#TRMPBF operate with VIN ≥ VOUT, and what is the impact on efficiency?
Yes, LTC3525ISC6-3#TRMPBF can regulate with VIN ≥ VOUT (e.g., 3.3V input to 3V output), but the synchronous rectifier is disabled in this mode. Efficiency drops significantly because the P-channel device operates as a pass transistor rather than a low-RDS(on) switch - resulting in higher conduction loss and reduced output current capability compared to boost operation.
What external components are required for basic operation of LTC3525ISC6-3#TRMPBF?
LTC3525ISC6-3#TRMPBF requires only three external components: a 10µH inductor (e.g., Murata LQH32CN100K53), a 10µF ceramic output capacitor (X5R/X7R), and a 1µF ceramic input bypass capacitor. No feedback resistors or compensation networks are needed - the 3V output is internally fixed, and regulation is achieved via integrated hysteresis control.
LTC3525ISC6-3#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 4.5V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 65mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
LTC3525ISC6-3#TRMPBF FAQ
1.How can I place an order for LTC3525ISC6-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525ISC6-3#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 LTC3525ISC6-3#TRMPBF reliable?
The price and inventory of LTC3525ISC6-3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525ISC6-3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3525ISC6-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525ISC6-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525ISC6-3#TRMPBF?
LTC3525ISC6-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525ISC6-3#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 LTC3525ISC6-3#TRMPBF?
For technical support, including LTC3525ISC6-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525ISC6-3#TRMPBF requirements.
6.How does Aetrix verify that LTC3525ISC6-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525ISC6-3#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 LTC3525ISC6-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3525ISC6-3#TRMPBF?
All LTC3525ISC6-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525ISC6-3#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 LTC3525ISC6-3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3525ISC6-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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