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Analog Devices Inc. LTC3525ISC6-3.3#TRMPBF
- Part No.:
- LTC3525ISC6-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525ISC6-3.3#TRMPBF.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,299
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Product details
Overview
LTC3525ISC6-3.3#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 starts up from as low as 0.85V input, delivers fixed 3.3V output, achieves up to 95% efficiency at 60mA load from 1.8V input, and operates with only three external components. It serves in portable medical devices and low-power instrumentation where ultralow quiescent current and true output isolation are critical.
For engineers reviewing the LTC3525ISC6-3.3#TRMPBF datasheet, LTC3525ISC6-3.3#TRMPBF pinout, LTC3525ISC6-3.3#TRMPBF application, or LTC3525ISC6-3.3#TRMPBF equivalent, key selection criteria include input start-up voltage (0.85V), burst-mode quiescent current (7µA), output disconnect capability, SC70-6 package thermal performance (θJA = 150°C/W), and compatibility with 10µH inductors and 10–22µF ceramic output capacitors.
Technical Context
The LTC3525ISC6-3.3#TRMPBF employs a hysteretic Burst Mode® control architecture with adaptive peak/valley inductor current regulation-reducing peak current to 150mA at light loads and scaling up to 400mA under heavy load. Its internal 0.5Ω NMOS switch and 0.8Ω PMOS synchronous rectifier enable high efficiency without an external Schottky diode.
True output disconnect is implemented via controlled gate drive sequencing during shutdown, isolating VOUT from VIN and limiting inrush current. The device supports VIN ≥ VOUT operation but disables synchronous rectification in that mode, reducing efficiency and output current capability while maintaining regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over –40°C to 125°C junction temperature-ensures stable rail for 3.3V logic and sensors without external feedback. |
| Input Start-Up Voltage | 0.85V minimum-enables operation from partially discharged single alkaline/NiMH cells (e.g., down to ~0.9V under load). |
| Quiescent Current | 7µA typical in Burst Mode®-maximizes battery runtime in always-on, low-duty-cycle applications like glucose meters. |
| Shutdown Current | <1µA-achieves near-zero system standby power when disconnected by SHDN pin. |
| Peak Switch Current | 400mA maximum-supports up to 140mA output at 3.3V from 1.8V input (η ≈ 90%), enabling compact inductor selection. |
| Switch On-Resistance | NMOS: 0.5Ω, PMOS: 0.8Ω-minimizes conduction loss and thermal rise in the 6-lead SC70 package. |
| Operating Junction Temp | –40°C to +125°C-qualified for industrial and automotive-adjacent embedded environments without derating. |
Pinout & Package
Package: 6-Lead Plastic SC70 (SC6), 1.0mm max height, 2.2mm × 1.35mm footprint-optimized for space-constrained portable PCBs with ground-plane thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Enable/Disable Input | Pulled high (>1V) to activate; pulled low (<0.4V) to disable with full output disconnect and <1µA shutdown current. |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins reduce impedance path for both input and output return currents-critical for noise-sensitive analog loads. |
| VIN (Pin 3) | Main Input Power Supply | Accepts 0.85V–6V; powers IC until VOUT exceeds VIN+0.2V, then switches to VOUT supply-enabling ultra-low-input operation. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers fixed 3.3V; connects directly to output capacitor; internally disconnected from VIN during shutdown to prevent backfeed. |
| SW (Pin 6) | Internal Switch Node | Drives external 10µH inductor; includes integrated antiringing resistor to suppress EMI at zero-current crossing. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | 7µA quiescent current enables >1-year battery life in 10µA average-load applications (e.g., wireless sensor nodes). |
| Output Disconnect | Zero backfeed and inrush current during startup/shutdown-protects downstream circuitry and preserves battery charge. |
| Synchronous Rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by 5–10% vs. diode-based boosters. |
| Adaptive Peak Current Limit | Automatically scales from 150mA (light load) to 400mA (heavy load)-optimizing efficiency across dynamic load profiles. |
| Antiringing Control | Integrated resistor across SW–VIN damps LC ringing at switch turn-off-reducing EMI without external snubbers. |
Applications
| Portable Medical Sensors | Low-Power Instrumentation |
|---|---|
Use Scenario: Glucose meter operating from a single AA alkaline cell with intermittent 3.3V sensor and ADC activation. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator with cold-start capability and zero-shutdown leakage. Use Value: Enables 2000+ measurements per battery by sustaining regulation down to 0.85V input and drawing only 7µA between readings. |
Use Scenario: Handheld multimeter requiring stable 3.3V supply for precision analog front-end and LCD driver. IC Role / Device Role / Timing Role: Efficient voltage booster replacing charge pump to avoid noise coupling into measurement circuits. Use Value: Delivers 65mA at 3.3V from 1V input with <60mVpp ripple (22µF COUT), ensuring ADC reference stability and display clarity. |
| Wearable Health Monitors | Industrial Remote Sensors |
Use Scenario: Pulse oximeter powered by coin-cell battery, needing regulated 3.3V for optical drivers and BLE radio. IC Role / Device Role / Timing Role: Micropower DC/DC converter with fast wake-up (<120µs startup delay) and output disconnect during sleep. Use Value: Supports 30-day runtime on CR2032 by combining 7µA quiescent current, <1µA shutdown, and efficient 140mA burst delivery. |
Use Scenario: Wireless temperature node in factory environment, operating from two NiMH cells with wide-temp requirements. IC Role / Device Role / Timing Role: Industrial-grade boost regulator qualified to –40°C to +125°C junction temperature. Use Value: Maintains 3.3V output across full temperature range and input decay (0.85V–3.2V), eliminating brownouts in unregulated battery stacks. |
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#TRMPBF | Same SC70-6 package, 600mA ISW, 500kHz fixed frequency, 20µA IQ, no output disconnect. | Lacks true output disconnect-unsuitable where backfeed or inrush must be eliminated. | Choose for higher output current (up to 100mA at 3.3V) and predictable EMI profile; accept higher IQ and no VOUT isolation. |
| LTC3528EDC#TRMPBF | 2mm × 3mm DFN-8, 1A ISW, 700mV start-up, 12µA IQ, output disconnect, 1MHz switching. | Higher current capability and lower start-up voltage-but larger footprint and different pinout. | Choose when >140mA continuous load or sub-0.85V start-up is required; redesign PCB layout and verify thermal margin. |
Compared with LTC3525ISC6-3.3#TRMPBF, LTC3429EDC#TRMPBF trades output disconnect and ultralow IQ for higher current and fixed-frequency operation, while LTC3528EDC#TRMPBF offers greater power and lower start-up voltage at the cost of package size and layout compatibility.
Availability
LTC3525ISC6-3.3#TRMPBF is available at Aetrix Electronics and suitable for portable medical devices, low-power instrumentation, wearable health monitors, and industrial remote sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3525ISC6-3.3#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 its legacy of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LTC3525 family was designed specifically for micropower, battery-critical applications demanding cold-start capability, output isolation, and minimal external components-targeting portable healthcare, instrumentation, and energy-harvesting edge nodes.
FAQ
What is the minimum input voltage required for the LTC3525ISC6-3.3#TRMPBF to start up?
The LTC3525ISC6-3.3#TRMPBF starts up from a minimum input voltage of 0.85V, verified across the full –40°C to +125°C junction temperature range. This allows reliable operation from nearly depleted single-cell alkaline or NiMH batteries. Startup requires both this voltage threshold and sufficient load capacitance (≥10µF) on VOUT to sustain oscillation until regulation is achieved.
Does the LTC3525ISC6-3.3#TRMPBF provide true output disconnect during shutdown?
Yes, the LTC3525ISC6-3.3#TRMPBF provides true output disconnect: when SHDN is pulled below 0.4V, the internal PMOS switch opens, fully isolating VOUT from VIN. This prevents backfeed, eliminates inrush current at startup, and ensures VOUT decays only through the load-critical for systems with multiple power domains or safety-critical shutdown sequences.
What is the typical quiescent current of the LTC3525ISC6-3.3#TRMPBF in active operation?
The LTC3525ISC6-3.3#TRMPBF draws a typical quiescent current of 7µA in Burst Mode® operation at 25°C, with a maximum of 15µA over temperature. This ultralow IQ is measured with SHDN = VIN and no switching activity, enabling multi-year battery life in intermittently active applications such as wireless sensors and portable diagnostics.
Can the LTC3525ISC6-3.3#TRMPBF operate with input voltage higher than its 3.3V output?
Yes, the LTC3525ISC6-3.3#TRMPBF supports VIN ≥ VOUT operation (e.g., 3.6V input to 3.3V output), but in this mode the synchronous rectifier is disabled. The device regulates using body-diode conduction, resulting in reduced efficiency (~60–70%) and lower maximum output current-intended only for transient conditions, not continuous operation.
What external components are required for basic operation of the LTC3525ISC6-3.3#TRMPBF?
The LTC3525ISC6-3.3#TRMPBF requires only three external components: a 10µH power inductor (e.g., Murata LQH32CN100K53), a 1µF ceramic input capacitor placed near VIN/GND, and a 10µF (minimum) ceramic output capacitor on VOUT/GND. A 22µF output capacitor is recommended to reduce ripple to ≤20mVpp at light load.
LTC3525ISC6-3.3#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):
- 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
LTC3525ISC6-3.3#TRMPBF FAQ
1.How can I place an order for LTC3525ISC6-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525ISC6-3.3#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 LTC3525ISC6-3.3#TRMPBF reliable?
The price and inventory of LTC3525ISC6-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525ISC6-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3525ISC6-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525ISC6-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525ISC6-3.3#TRMPBF?
LTC3525ISC6-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525ISC6-3.3#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 LTC3525ISC6-3.3#TRMPBF?
For technical support, including LTC3525ISC6-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525ISC6-3.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3525ISC6-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525ISC6-3.3#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 LTC3525ISC6-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3525ISC6-3.3#TRMPBF?
All LTC3525ISC6-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525ISC6-3.3#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 LTC3525ISC6-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3525ISC6-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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