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Analog Devices Inc. LTC3525DESC6-3.3#TRPBF
- Part No.:
- LTC3525DESC6-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525DESC6-3.3#TRPBF.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,982
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Product details
Overview
LTC3525DESC6-3.3#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-powered systems. It starts up from 0.85V, delivers fixed 3.3V output, supports pass-through mode in shutdown, and achieves up to 95% efficiency with only three external components. It powers portable medical devices, digital cameras, and glucose meters.
For engineers reviewing the LTC3525DESC6-3.3#TRPBF datasheet, LTC3525DESC6-3.3#TRPBF pinout, LTC3525DESC6-3.3#TRPBF application, or LTC3525DESC6-3.3#TRPBF equivalent, key selection criteria include ultralow 7µA quiescent current, 400mA peak switch current, SC70-6 package footprint, pass-through mode behavior, and input voltage range down to 0.5V during regulation.
Technical Context
The LTC3525DESC6-3.3#TRPBF uses Burst Mode® operation to maintain high efficiency at light loads, with dynamically adjusted peak inductor current (150mA–400mA) and valley current control to stabilize switching frequency. Its internal N-channel MOSFET (0.5Ω) and P-channel synchronous rectifier (0.8Ω) enable high-efficiency boost conversion without an external diode.
During shutdown, the P-channel switch turns on, connecting VIN to VOUT through the inductor-enabling true pass-through functionality. Startup requires VIN ≥ 0.85V, and regulation is sustained down to VIN = 0.5V depending on load, with output disconnect not implemented (unlike LTC3525-3.3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.20V–3.40V), internally trimmed for stable rail generation |
| Input Start-Up Voltage | 0.85V min - enables operation from single alkaline/NiMH cell at end-of-life |
| Quiescent Current | 7µA typical - maximizes battery runtime in always-on portable instrumentation |
| Peak Switch Current | 400mA max - supports up to 140mA output at 3.3V from 1.8V input (with 95% efficiency) |
| Operating Input Range | 0.5V to 4.5V - sustains regulation below startup voltage under light load |
| Efficiency | Up to 95% - exceeds charge pump alternatives while eliminating Schottky loss |
| Shutdown Current | 3µA max (including switch leakage) - preserves battery during storage or standby |
| Package | 6-Lead SC70 (SC6), 1mm profile - fits ultra-thin handheld and wearable designs |
Pinout & Package
6-Lead Plastic SC70 (SC6) package, 1.8mm × 1.15mm footprint, 1.0mm max height, JEDEC MO-203 AB / EIAJ SC-70 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pull <0.4V to disable and engage pass-through mode; pull >1V to enable; avoid 0.5V–1V above VIN/VOUT to prevent test mode activation |
| 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 Input Power Supply | Accepts 0.5V–4.5V; powers IC until VOUT > 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); enables pass-through when SHDN active |
| SW (Pin 6) | Switch Node | Drives external inductor; integrates anti-ringing resistor to suppress EMI at zero-current crossing |
Key Features
| Feature | Design Value |
|---|---|
| Pass-Through Mode | Direct VIN-to-VOUT connection via internal P-MOSFET during shutdown - eliminates need for external bypass FET in battery backup paths |
| Burst Mode® Operation | 7µA quiescent current with automatic burst frequency adjustment - maintains >85% efficiency down to 10µA load without audible noise |
| Dynamic Peak Current Scaling | Inductor peak current auto-scales from 150mA (light load) to 400mA (heavy load) - balances conduction loss vs. switching loss across operating range |
| Integrated Synchronous Rectification | 0.5Ω N-MOSFET + 0.8Ω P-MOSFET - replaces external Schottky diode, enabling >90% efficiency even at 1V input |
| Anti-Ringing Control | Internal resistor across SW–VIN at zero-current - reduces EMI and improves EMC compliance without extra components |
| Thermal & Short-Circuit Protection | Automatic shutdown above 125°C junction temperature and under output short - prevents damage during fault conditions |
Applications
| Glucose Meters | Digital Cameras |
|---|---|
Use Scenario: Battery-powered handheld device requiring stable 3.3V rail for microcontroller, sensor interface, and LCD backlight driver. IC Role / Device Role / Timing Role: Primary voltage booster converting single alkaline cell (0.9–1.6V) to regulated 3.3V output with pass-through during sleep mode. Use Value: 7µA quiescent current extends shelf life; 0.85V startup ensures full battery utilization; SC70-6 footprint enables compact PCB layout. | Use Scenario: Compact digital still camera using dual NiMH cells (1.8–3.2V) to power image sensor, flash controller, and SD card interface. IC Role / Device Role / Timing Role: High-efficiency step-up converter delivering 140mA at 3.3V with minimal heat rise in sealed enclosure. Use Value: 95% efficiency at 1.8V input minimizes thermal stress; pass-through mode maintains memory retention during power-off. |
| MP3 Players | Portable Instruments |
Use Scenario: Flash-based audio player powered by single Li-Ion cell (2.7–4.2V) needing clean 3.3V for DAC, codec, and display. IC Role / Device Role / Timing Role: Synchronous boost regulator with low-noise Burst Mode® operation to avoid interference with analog audio path. Use Value: 20mVpp ripple at light load ensures low THD; 1mm profile allows placement under battery or display module. | Use Scenario: Handheld multimeter or environmental sensor logger operating from one or two AA batteries over wide temperature range. IC Role / Device Role / Timing Role: Micropower DC/DC converter sustaining 3.3V rail during measurement bursts and long idle periods. Use Value: –40°C to 85°C operating range matches industrial requirements; 0.5V minimum input supports deep discharge detection. |
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 |
|---|---|---|---|
| LTC3429#TRMPBF | Same SC70-6 package; 600mA peak current; includes output disconnect (not pass-through); 20µA IQ | Requires external bypass path for VIN–VOUT continuity during shutdown; better for load-switching than battery passthrough | Select LTC3429#TRMPBF when output disconnect is needed and higher peak current justifies higher quiescent draw |
| LTC3525-3.3#TRMPBF | Same family, same pinout; output disconnect instead of pass-through; identical 7µA IQ and 0.85V startup | No VIN–VOUT continuity in shutdown - unsuitable where backup power path must remain active | Select LTC3525-3.3#TRMPBF only if output isolation during shutdown is required and pass-through is unnecessary |
Compared with LTC3525DESC6-3.3#TRPBF, LTC3429#TRMPBF offers higher current but sacrifices micropower efficiency and pass-through capability, while LTC3525-3.3#TRMPBF provides identical efficiency and startup performance but lacks the critical pass-through function required for battery-backed systems.
Availability
LTC3525DESC6-3.3#TRPBF is available at Aetrix Electronics and suitable for portable medical devices, digital imaging systems, battery-powered instrumentation, and consumer audio equipment requiring stable component supply with lead-free, RoHS-compliant packaging.
Supply support for LTC3525DESC6-3.3#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 continues its legacy of high-performance power management ICs for precision, portable, and industrial applications.
The LTC3525D product line was designed specifically for ultra-low-voltage, micropower boost conversion in space-constrained battery-powered systems - emphasizing startup from near-dead cells and minimal quiescent consumption.
FAQ
What is the minimum input voltage required for the LTC3525DESC6-3.3#TRPBF to start switching?
The LTC3525DESC6-3.3#TRPBF requires a minimum input voltage of 0.85V to initiate startup oscillation and begin regulation. Once started, it sustains regulation down to 0.5V depending on load current. This capability enables reliable operation from single alkaline or NiMH cells nearing end-of-life, which is critical for long-duration portable instrumentation where battery replacement is infrequent.
How does the pass-through mode function in the LTC3525DESC6-3.3#TRPBF during shutdown?
In shutdown mode (SHDN < 0.4V), the LTC3525DESC6-3.3#TRPBF turns on its internal P-channel MOSFET, creating a low-impedance path from VIN to VOUT through the external inductor. This pass-through mode maintains power continuity to downstream circuitry - essential for preserving SRAM contents or RTC operation in battery-powered systems without adding discrete FETs or diodes.
What is the maximum output current the LTC3525DESC6-3.3#TRPBF can deliver at 3.3V from a 1.2V input?
From a 1.2V input, the LTC3525DESC6-3.3#TRPBF delivers up to 60mA at 3.3V while maintaining regulation and ≤2.5% output droop. This value is confirmed in the "Maximum Output Current vs VIN" graph (Figure G01) and reflects the device's ability to sustain usable power under ultra-low-input conditions common in single-cell alkaline applications.
Does the LTC3525DESC6-3.3#TRPBF require an external Schottky diode?
No, the LTC3525DESC6-3.3#TRPBF does not require an external Schottky diode because it integrates both an N-channel MOSFET switch and a P-channel synchronous rectifier. This synchronous architecture eliminates forward-voltage drop losses associated with discrete diodes, enabling efficiencies up to 95% and simplifying bill-of-materials for space-constrained designs.
What package type and dimensions does the LTC3525DESC6-3.3#TRPBF use?
The LTC3525DESC6-3.3#TRPBF uses a 6-Lead Plastic SC70 (SC6) package measuring 1.8mm × 1.15mm with a maximum height of 1.0mm. Its JEDEC MO-203 AB and EIAJ SC-70 compliance ensures compatibility with standard pick-and-place equipment and reflow profiles, making it suitable for high-density portable PCB assemblies.
LTC3525DESC6-3.3#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
LTC3525DESC6-3.3#TRPBF FAQ
1.How can I place an order for LTC3525DESC6-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525DESC6-3.3#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 LTC3525DESC6-3.3#TRPBF reliable?
The price and inventory of LTC3525DESC6-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525DESC6-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3525DESC6-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525DESC6-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525DESC6-3.3#TRPBF?
LTC3525DESC6-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525DESC6-3.3#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 LTC3525DESC6-3.3#TRPBF?
For technical support, including LTC3525DESC6-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525DESC6-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3525DESC6-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525DESC6-3.3#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 LTC3525DESC6-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3525DESC6-3.3#TRPBF?
All LTC3525DESC6-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525DESC6-3.3#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 LTC3525DESC6-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3525DESC6-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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