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Analog Devices Inc. LTC3525DISC6-3.3#TRPBF
- Part No.:
- LTC3525DISC6-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525DISC6-3.3#TRPBF.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,461
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Product details
Overview
LTC3525DISC6-3.3#TRPBF 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 while drawing only 7µA quiescent current - enabling multi-year battery life in glucose meters and portable instrumentation.
For engineers reviewing the LTC3525DISC6-3.3#TRPBF datasheet, LTC3525DISC6-3.3#TRPBF pinout, LTC3525DISC6-3.3#TRPBF application, or LTC3525DISC6-3.3#TRPBF 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#TRPBF uses a hysteretic burst-mode control architecture with adaptive peak/valley inductor current regulation. Its internal 0.5Ω N-channel MOSFET switch and 0.8Ω P-channel synchronous rectifier enable high-efficiency boost conversion without external diodes.
In shutdown, the P-channel switch turns on, connecting VIN to VOUT through the external inductor - a true pass-through mode distinct from output disconnect variants. Startup begins at 0.85V using an internal oscillator, and normal regulation requires VOUT > VIN + 0.2V and either VIN or VOUT > 1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Start-Up Voltage | 0.85V minimum - enables operation from single alkaline or NiMH cells at end-of-life. |
| Fixed Output Voltage | 3.30V ±3% - internally trimmed; no feedback resistors required. |
| Quiescent Current | 7µA typical in Burst Mode® - extends battery runtime in always-on sensor nodes. |
| Peak Switch Current | 400mA maximum - supports up to 140mA output at 3.3V from 1.8V input. |
| Efficiency | Up to 95% at medium load - exceeds charge-pump alternatives in low-input-voltage applications. |
| Operating Junction Temp | –40°C to 125°C - qualified for industrial and automotive-adjacent portable equipment. |
| Package | 6-Lead SC70 (1.8mm × 1.3mm × 1.0mm) - ultra-compact footprint for space-constrained PCBs. |
Pinout & Package
Supplied in a 6-lead plastic SC70 package (JEDEC MO-203 AB, EIAJ SC-70), measuring 1.8mm × 1.3mm × 1.0mm with 0.65mm pitch. The package features exposed pad thermal enhancement and is RoHS-compliant with lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pull <0.4V to enable pass-through mode; pull >1V to activate regulation; avoid 0.5–1V above VIN/VOUT to prevent test mode activation. |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins reduce ground bounce and improve thermal dissipation; connect both to low-impedance ground plane. |
| VIN (Pin 3) | Main Input Power Supply | Accepts 0.5V–4.5V; powers IC until VOUT exceeds VIN + 0.2V, then switches to VOUT supply path. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers fixed 3.3V; connects directly to output capacitor (min. 10µF ceramic); serves as pass-through path during shutdown. |
| SW (Pin 6) | Switch Node | Drives external inductor; integrates anti-ringing circuit to suppress EMI when inductor current reaches zero. |
Key Features
| Feature | Design Value |
|---|---|
| Pass-Through Mode | Connects VIN to VOUT via inductor in shutdown - maintains system power rail continuity without external FETs or diodes. |
| Burst Mode® Operation | 7µA quiescent current with automatic burst frequency scaling - eliminates audible noise while preserving light-load efficiency. |
| Adaptive Peak Current Limit | Adjusts from 150mA to 400mA based on load - minimizes conduction loss at light loads and sustains output current at heavy loads. |
| Integrated Synchronous Rectification | 0.5Ω NMOS + 0.8Ω PMOS switches - eliminates Schottky diode losses and reduces BOM count by one component. |
| Anti-Ringing Control | Internal resistor across SW–VIN at zero-current crossing - suppresses LC ringing, lowering EMI and improving EMC compliance. |
Applications
| Glucose Monitoring Systems | Portable Medical Instruments |
|---|---|
Use Scenario: Battery-powered handheld glucose meter operating from single AA alkaline cell over full discharge curve (1.5V → 0.9V). IC Role / Device Role / Timing Role: Primary 3.3V power rail generator with pass-through mode enabling MCU wake-up from deep sleep without brownout. Use Value: 0.85V start-up and 7µA IQ allow >2-year shelf life and >5000 test cycles per battery set. | Use Scenario: Pocket-sized pulse oximeter requiring stable 3.3V for analog front-end and BLE radio under variable load. IC Role / Device Role / Timing Role: Synchronous boost converter supplying regulated rail while minimizing ripple-induced noise in ADC reference path. Use Value: 20mVpp ripple at light load and 60mVpp at full load (140mA) ensure <1 LSB error in 12-bit medical-grade ADCs. |
| Digital Camera Backlight Drivers | Low-Power IoT Sensor Nodes |
Use Scenario: Compact digital camera with white LED backlight powered from dual NiMH cells (2.4V nominal). IC Role / Device Role / Timing Role: Boost converter feeding constant-current LED driver IC; must support rapid on/off cycling without voltage sag. Use Value: 20µs–120µs startup delay and pass-through mode enable instant backlight reactivation after brief sleep intervals. | Use Scenario: Wireless environmental sensor node harvesting energy from small solar cell or thermoelectric generator (0.8–2.0V input range). IC Role / Device Role / Timing Role: Primary voltage regulator converting irregular low-voltage source into stable 3.3V for microcontroller and RF transceiver. Use Value: 95% peak efficiency and 0.5V minimum operating input extend usable harvest window by >30% compared to charge pumps. |
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#TRPBF | Output disconnect in shutdown (not pass-through); same 3.3V output, 0.85V start-up, and SC70-6 package. | Requires external path for VIN-to-VOUT continuity during shutdown; unsuitable where rail retention is mandatory. | Select LTC3525DISC6-3.3#TRPBF when pass-through functionality is required; choose LTC3525-3.3#TRPBF if output isolation during shutdown is preferred. |
| LTC3429#TRMPBF | Same SC70-6 package and 3.3V option; includes output disconnect, higher 600mA peak current, but no pass-through mode. | Higher output current capability (up to 200mA at 3.3V from 1.8V), yet lacks VIN–VOUT continuity in shutdown. | LTC3429#TRMPBF suits higher-current apps needing disconnect; LTC3525DISC6-3.3#TRPBF remains optimal for ultra-low-IQ + pass-through combo. |
Compared with LTC3525-3.3#TRPBF and LTC3429#TRMPBF, the LTC3525DISC6-3.3#TRPBF uniquely combines sub-1V start-up, 7µA IQ, and true pass-through mode in the same 6-pin SC70 footprint - making it the only choice when system-level power rail continuity during shutdown is non-negotiable.
Availability
LTC3525DISC6-3.3#TRPBF is available at Aetrix Electronics and suitable for glucose meters, portable medical instruments, digital cameras, and low-power IoT sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3525DISC6-3.3#TRPBF 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, datasheet documentation, and manufacturing continuity for all Linear-branded power management ICs.
The LTC3525D family was designed specifically for ultra-low-power, single-cell battery-powered applications demanding high efficiency below 1V input - targeting portable healthcare, instrumentation, and energy-harvesting systems.
FAQ
What is the minimum input voltage required for the LTC3525DISC6-3.3#TRPBF to start switching?
The LTC3525DISC6-3.3#TRPBF starts switching with an input voltage as low as 0.85V. This is enabled by an internal start-up oscillator that operates independently of the main regulation loop. Once VOUT exceeds VIN by at least 0.2V and either VIN or VOUT rises above 1.8V, the device transitions to normal synchronous boost operation. Below 0.85V, the part remains inactive.
How does the pass-through mode function in the LTC3525DISC6-3.3#TRPBF during shutdown?
When SHDN is pulled below 0.4V, the LTC3525DISC6-3.3#TRPBF disables switching and turns on its internal 0.8Ω P-channel MOSFET. This creates a low-resistance path from VIN to VOUT through the external inductor, allowing the input source to directly power downstream circuitry. Unlike output disconnect variants, this preserves system rail continuity without requiring additional external components.
What is the maximum continuous output current the LTC3525DISC6-3.3#TRPBF can deliver at 3.3V?
The LTC3525DISC6-3.3#TRPBF delivers up to 140mA at 3.3V when supplied from a 1.8V input, and up to 60mA at 3.3V from a 1.0V input - values measured before VOUT drops 2.5% from regulation. These limits depend on input voltage, ambient temperature, PCB layout, and output capacitor value. Peak switch current is rated at 400mA, but average output current is constrained by thermal and efficiency trade-offs.
Does the LTC3525DISC6-3.3#TRPBF require external compensation components?
No, the LTC3525DISC6-3.3#TRPBF is fully self-contained and requires no external compensation components. Its hysteretic burst-mode control architecture eliminates the need for loop compensation networks. Only three external components are needed: an inductor (typically 10µH), an input bypass capacitor (≥1µF ceramic), and an output filter capacitor (≥10µF ceramic). This simplifies design and reduces bill-of-materials cost.
What package variant does the LTC3525DISC6-3.3#TRPBF use, and what are its thermal characteristics?
The LTC3525DISC6-3.3#TRPBF uses a 6-lead plastic SC70 package (JEDEC MO-203 AB) with dimensions 1.8mm × 1.3mm × 1.0mm. Its thermal resistance is θJA = 150°C/W on a PCB with ground plane, and θJA = 256°C/W in free air. The junction-to-case thermal resistance is not specified, but the package supports continuous operation up to 125°C junction temperature with proper board layout and copper area.
LTC3525DISC6-3.3#TRPBF 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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3525DISC6-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525DISC6-3.3#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3525DISC6-3.3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3525DISC6-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525DISC6-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525DISC6-3.3#TRPBF?
LTC3525DISC6-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525DISC6-3.3#TRPBF 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#TRPBF?
For technical support, including LTC3525DISC6-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525DISC6-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3525DISC6-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525DISC6-3.3#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3525DISC6-3.3#TRPBF?
All LTC3525DISC6-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525DISC6-3.3#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3525DISC6-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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