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Analog Devices Inc. LTC3525DESC6-3.3#TRMPBF
- Part No.:
- LTC3525DESC6-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525DESC6-3.3#TRMPBF.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,686
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Product details
Overview
LTC3525DESC6-3.3#TRMPBF 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 as low as 0.85V input, delivers fixed 3.3V output with up to 140mA at 1.8V input, features pass-through mode in shutdown, and achieves up to 95% efficiency. It serves as a compact, high-efficiency replacement for charge pumps in portable medical and instrumentation devices.
For engineers reviewing the LTC3525DESC6-3.3#TRMPBF datasheet, LTC3525DESC6-3.3#TRMPBF pinout, LTC3525DESC6-3.3#TRMPBF application, or LTC3525DESC6-3.3#TRMPBF equivalent, key selection considerations include ultralow 7µA quiescent current, SC70-6 package footprint, pass-through mode behavior, 0.5Ω NMOS/0.8Ω PMOS switch RDS(on), and compatibility with minimal external components (1 inductor, 2 capacitors).
Technical Context
The LTC3525DESC6-3.3#TRMPBF employs 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 proprietary start-up oscillator enables operation from 0.85V, and internal UVLO ensures reliable turn-on only when VIN exceeds threshold.
During normal regulation, synchronous rectification is active with NMOS switch (SW–GND) and PMOS rectifier (VOUT–SW); in pass-through mode (SHDN < 0.4V), the PMOS connects VIN to VOUT via the inductor. Anti-ringing control suppresses SW node oscillation at zero-current crossing, reducing EMI without external snubbers.
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. |
| Fixed Output Voltage | 3.30V ±3% - internally trimmed, eliminates external feedback resistors and saves board space. |
| Quiescent Current | 7µA typical - maximizes battery runtime in always-on or infrequently active portable devices. |
| Peak Switch Current | 400mA - supports ≥140mA output at 1.8V input while maintaining regulation and thermal safety. |
| Switch RDS(on) | 0.5Ω (NMOS), 0.8Ω (PMOS) - reduces conduction loss and improves efficiency vs. diode-based boosters. |
| Shutdown Pass-Through | VIN connected to VOUT via inductor - maintains system rail continuity during sleep, simplifying power sequencing. |
| Operating Temp Range | –40°C to 85°C junction - validated for industrial and portable consumer environments. |
| Package | 6-Lead SC70 (SC6), 1mm profile - ultra-compact footprint compatible with space-constrained PCB layouts. |
Pinout & Package
Package: 6-Lead Plastic SC70 (SC6), 1.8mm × 1.2mm × 1.0mm height, 0.65mm pitch, 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 enable pass-through mode; pull >1V to activate converter; avoid 0.5–1.0V above VIN/VOUT to prevent test mode activation. |
| GND (Pins 2, 5) | Power and Signal Ground Reference | Dual ground pins reduce impedance and improve thermal dissipation; must be tied to common low-impedance ground plane. |
| VIN (Pin 3) | Main Input Power Supply | Accepts 0.5V–4.5V; powers IC until VOUT > VIN + 0.2V, then switches to VOUT supply; requires ≥1µF ceramic bypass. |
| VOUT (Pin 4) | Regulated Output & Synchronous Rectifier Source | Delivers 3.3V output; connects to output capacitor (≥10µF ceramic); enables pass-through when SHDN is low. |
| SW (Pin 6) | Internal NMOS Switch Drain Node | Connects to inductor; internal anti-ringing resistor minimizes EMI at zero-current crossover; voltage swing up to 6V absolute max. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | 7µA quiescent current enables >1-year battery life in low-duty-cycle glucose meters and remote sensors. |
| Pass-Through Mode | VIN-to-VOUT connection in shutdown eliminates need for external back-to-back MOSFETs in rail-keeping applications. |
| Integrated Power Switches | 0.5Ω NMOS + 0.8Ω PMOS reduce BOM count and PCB area vs. discrete FET + Schottky solutions. |
| Anti-Ringing Control | On-chip resistor across SW–VIN damps LC ringing without external snubber, lowering EMI and layout sensitivity. |
| Low-Profile SC70 Package | 1mm height allows use in slim handhelds and wearable electronics where Z-height is constrained. |
| Start-Up from 0.85V | Enables full functionality down to single-cell alkaline discharge voltage (~0.9V), extending usable battery capacity. |
Applications
| Glucose Monitoring Systems | Portable Digital Audio Players |
|---|---|
|
Use Scenario: Battery-powered handheld glucometer operating from single AAA alkaline cell with variable load (sensor bias, display backlight, MCU). IC Role / Device Role / Timing Role: Primary 3.3V rail generator enabling ADC, LCD controller, and Bluetooth LE transceiver from declining 0.8–1.5V input. Use Value: 7µA quiescent current extends shelf life; pass-through mode preserves memory state during button-wake transitions without auxiliary LDO. |
Use Scenario: MP3 player using dual NiMH cells (2.4V nominal) powering 3.3V audio DAC, flash memory, and OLED display. IC Role / Device Role / Timing Role: Efficient step-up converter delivering stable 3.3V under dynamic load (10–140mA), supporting burst-mode playback and standby. Use Value: Up to 95% efficiency at 100mA reduces heat rise in sealed enclosure; SC70 size fits tight layout near codec IC. |
| Handheld Test Instruments | Wireless Sensor Nodes |
|
Use Scenario: Pocket-sized multimeter powered by single AA cell, requiring precise 3.3V reference and analog front-end biasing. IC Role / Device Role / Timing Role: Low-noise, low-ripple 3.3V source for precision op-amps and SAR ADC, with fast transient response to measurement bursts. Use Value: 20mVPP ripple at light load ensures <0.01% reference error; 20–120µs startup delay meets instant-on user expectation. |
Use Scenario: LoRaWAN node powered by CR2032 coin cell, transmitting sensor data every 5 minutes with 100ms active window. IC Role / Device Role / Timing Role: Micropower boost converter supplying 3.3V to MCU and RF transceiver only during transmit, then entering ultra-low-IQ sleep. Use Value: 7µA IQ enables >2-year battery life; pass-through mode allows MCU to monitor VIN directly during deep sleep without wake-up overhead. |
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 (not pass-through) in shutdown; same 3.3V output, 0.85V start-up, and SC70 package. | Requires external circuitry to maintain VOUT during shutdown; unsuitable where rail continuity is mandatory. | Select LTC3525DESC6-3.3#TRMPBF when pass-through is required; choose LTC3525-3.3 only if output isolation suffices. |
| LTC3429 | Same SC70 package, 95% efficiency, but includes output disconnect and higher 1V min start-up; IQ = 20µA. | Cannot provide VIN-to-VOUT continuity; better suited for applications needing strict output isolation during sleep. | LTC3525DESC6-3.3#TRMPBF is preferred for rail-keeping; LTC3429 fits where low-noise shutdown isolation matters more than pass-through. |
Compared with LTC3525-3.3 and LTC3429, the LTC3525DESC6-3.3#TRMPBF uniquely delivers verified pass-through functionality in shutdown-enabling seamless power-state transitions without auxiliary components-while maintaining identical footprint, start-up voltage, and quiescent current advantages.
Availability
LTC3525DESC6-3.3#TRMPBF is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, wireless sensor nodes, and handheld consumer electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3525DESC6-3.3#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 power management ICs with rigorous characterization and long-term product support.
The LTC3525D family was designed specifically for ultra-low-power, single-cell battery applications demanding high efficiency at microamp quiescent currents and minimal external components-targeting portable health, sensing, and audio markets.
FAQ
What is the minimum input voltage required for the LTC3525DESC6-3.3#TRMPBF to start switching?
The LTC3525DESC6-3.3#TRMPBF starts switching with an input voltage as low as 0.85V, enabled by its dedicated start-up oscillator. Once regulation begins, it can sustain operation down to 0.5V depending on load current. This capability allows full functionality across the entire discharge curve of a single alkaline or NiMH cell, making the LTC3525DESC6-3.3#TRMPBF ideal for long-life portable devices.
How does the pass-through mode function in the LTC3525DESC6-3.3#TRMPBF during shutdown?
In shutdown (SHDN < 0.4V), the LTC3525DESC6-3.3#TRMPBF turns on its internal P-channel MOSFET, connecting VIN to VOUT through the external inductor. This creates a low-impedance path (<1Ω typical) that maintains the output rail without additional components. Unlike output disconnect variants, the LTC3525DESC6-3.3#TRMPBF ensures uninterrupted power to downstream circuitry during sleep states-critical for memory retention and fast wake-up in portable instruments.
What external components are required to operate the LTC3525DESC6-3.3#TRMPBF?
The LTC3525DESC6-3.3#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, compensation networks, or Schottky diodes are needed due to its fixed 3.3V output and integrated synchronous rectification-reducing BOM cost and PCB area versus competing boost solutions.
What is the typical quiescent current of the LTC3525DESC6-3.3#TRMPBF, and how does it impact battery life?
The LTC3525DESC6-3.3#TRMPBF draws just 7µA typical quiescent current in Burst Mode® operation, measured at VOUT with SHDN high and no load. In a typical glucose meter using a 200mAh alkaline cell, this enables over 1,000 days of standby time before depletion. The ultralow IQ directly extends usable battery capacity-especially critical in always-on or infrequent-use portable medical devices where the LTC3525DESC6-3.3#TRMPBF is commonly deployed.
Does the LTC3525DESC6-3.3#TRMPBF require special layout considerations for EMI reduction?
Yes-the LTC3525DESC6-3.3#TRMPBF integrates anti-ringing control to damp SW node oscillation at zero-current crossing, significantly reducing high-frequency EMI. To maximize this benefit, place the input capacitor within 2mm of VIN–GND pins, route the inductor directly between SW and VIN with short traces, and use a solid ground plane beneath the IC. These practices-combined with the internal anti-ringing feature-allow the LTC3525DESC6-3.3#TRMPBF to meet Class B emissions without added ferrites or shielding in most portable designs.
LTC3525DESC6-3.3#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):
- 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#TRMPBF FAQ
1.How can I place an order for LTC3525DESC6-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525DESC6-3.3#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 LTC3525DESC6-3.3#TRMPBF reliable?
The price and inventory of LTC3525DESC6-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525DESC6-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3525DESC6-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525DESC6-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525DESC6-3.3#TRMPBF?
LTC3525DESC6-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525DESC6-3.3#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 LTC3525DESC6-3.3#TRMPBF?
For technical support, including LTC3525DESC6-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525DESC6-3.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3525DESC6-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525DESC6-3.3#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 LTC3525DESC6-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3525DESC6-3.3#TRMPBF?
All LTC3525DESC6-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525DESC6-3.3#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 LTC3525DESC6-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3525DESC6-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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