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Analog Devices Inc. LTC3525ESC6-3.3#TRPBF
- Part No.:
- LTC3525ESC6-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525ESC6-3.3#TRPBF.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:828
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Product details
Overview
LTC3525ESC6-3.3#TRPBF 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 1.2V input, and features ultralow 7µA quiescent current-enabling extended runtime in glucose meters and portable instrumentation.
For engineers reviewing the LTC3525ESC6-3.3#TRPBF datasheet, LTC3525ESC6-3.3#TRPBF pinout, LTC3525ESC6-3.3#TRPBF application, or LTC3525ESC6-3.3#TRPBF equivalent, key selection criteria include input start-up voltage (0.85V), output disconnect capability, SC70-6 package footprint, burst-mode operation, and thermal shutdown behavior under sustained 125°C junction conditions.
Technical Context
The LTC3525ESC6-3.3#TRPBF implements a hysteretic burst-mode control architecture with integrated 0.5Ω N-channel MOSFET and 0.8Ω P-channel synchronous rectifier. It operates in three distinct phases: startup oscillator mode (enabled below 1.8V), normal synchronous boost mode (VOUT > VIN + 0.2V), and sleep mode (output capacitor supplies load between bursts).
Its antiringing circuit actively damps switch-node oscillation at zero inductor current, reducing EMI. The power-adjust feature dynamically scales peak inductor current from 150mA (light load) to 400mA (heavy load), maintaining high efficiency across 0.01–60mA output range while limiting output ripple to 20mVPP (light load) and 60mVPP (full load with 10µF ceramic output capacitor).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.20V–3.40V) over –40°C to 85°C junction range |
| Input Start-Up Voltage | 0.85V minimum-enables operation from single NiMH/alkaline cell at end-of-life |
| Quiescent Current | 7µA typical at VOUT-maximizes battery life in always-on sensor nodes |
| Peak Switch Current | 400mA maximum-supports ≥140mA output at 1.8V input with 3.3V output |
| Shutdown Current | <1µA-ensures zero-load battery drain during system sleep |
| Efficiency | Up to 95% at 60mA load from 1.2V input-exceeds charge-pump alternatives |
| Package | 6-Lead SC70 (2.2mm × 1.35mm × 1.0mm)-fits ultra-thin portable designs |
Pinout & Package
6-Lead Plastic SC70 package (JEDEC MO-203 AB, EIAJ SC-70), 1.0mm max height, 0.65mm pitch, lead-free finish. Pin 1 marked with index area; thermal resistance θJA = 150°C/W on PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pulled <0.4V to disconnect VOUT from VIN and reduce IQ to <1µA; must stay <(VIN + 0.4V) to avoid test mode activation |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins minimize ground bounce; both must be connected to low-impedance PCB ground plane |
| VIN (Pin 3) | Main Input Power Supply | Accepts 0.85V–6V; powers IC until VOUT exceeds VIN by 0.2V, then switches to VOUT supply |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers fixed 3.3V; internal feedback connects here; output disconnect isolates load during shutdown |
| SW (Pin 6) | Switch Node | Connects to inductor; internal antiring resistor clamps ringing when inductor current reaches zero |
Key Features
| Feature | Design Value |
|---|---|
| Output Disconnect | True mechanical disconnect of VOUT from VIN during shutdown-eliminates inrush current and enables zero-current standby |
| Burst Mode® Operation | 7µA quiescent current with automatic burst frequency scaling-maintains high efficiency down to 10µA load without audible noise |
| Integrated Power Switches | 0.5Ω NMOS switch + 0.8Ω PMOS synchronous rectifier-replaces external Schottky diode and reduces conduction loss |
| Antiringing Control | Internal resistor across SW–VIN at zero-current crossing-suppresses EMI without external snubber components |
| Thermal Shutdown | Activates above 125°C junction temperature-protects device during overload or poor heatsinking |
Applications
| Glucose Meters | Portable Instrumentation |
|---|---|
Use Scenario: Battery-powered handheld medical device requiring stable 3.3V rail from single alkaline cell (0.9–1.6V). IC Role / Device Role / Timing Role: Primary 3.3V power supply with output disconnect to isolate sensor circuitry during measurement intervals. Use Value: 0.85V start-up enables full battery utilization; 7µA IQ extends shelf life beyond 2 years in standby. | Use Scenario: Handheld multimeter or data logger powered by two NiMH cells (1.8–2.8V). IC Role / Device Role / Timing Role: Efficient 3.3V generation for microcontroller, ADC, and LCD bias rails. Use Value: 95% efficiency at 60mA reduces heat rise in sealed enclosure; SC70-6 footprint saves board space. |
| MP3 Players | Digital Cameras |
Use Scenario: Low-power audio playback device using single Li-Ion cell (3.0–4.2V) but requiring regulated 3.3V for DAC and codec. IC Role / Device Role / Timing Role: Step-down-capable boost converter that maintains regulation even when VIN ≥ VOUT via output disconnect. Use Value: Enables direct Li-Ion connection without pre-regulator; <1µA shutdown current prevents battery drain during pause mode. | Use Scenario: Compact digital camera with flash LED requiring clean 3.3V for image sensor and processor. IC Role / Device Role / Timing Role: Primary 3.3V supply with low output ripple (20mVPP) to prevent sensor noise and image artifacts. Use Value: Integrated antiringing control eliminates need for external RC snubber-reducing BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3429ESC6#TRPBF | Same SC70-6 package; 5V output option only; 20µA IQ; lower 1V min input start-up | Requires external resistor divider for 3.3V output; less efficient below 1.2V input | Select when 5V output is needed or when higher IQ is acceptable for simplified design |
| LTC3528EDDB-3.3#TRPBF | 2mm × 3mm DFN-8; 700mV start-up; 12µA IQ; 1A output capability | Larger footprint; supports higher load currents but requires more external components | Select when >140mA output current or sub-0.85V start-up is required |
Compared with LTC3429ESC6#TRPBF and LTC3528EDDB-3.3#TRPBF, the LTC3525ESC6-3.3#TRPBF offers the lowest quiescent current (7µA) and tightest output voltage tolerance (±3%) in the smallest SC70-6 package-making it optimal for space-constrained, ultra-low-power 3.3V applications where 140mA peak load suffices.
Availability
LTC3525ESC6-3.3#TRPBF is available at Aetrix Electronics and suitable for glucose meters, portable instrumentation, MP3 players, and digital cameras requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LTC3525ESC6-3.3#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 application engineering for legacy Linear parts including the LTC3525 family.
The LTC3525 product line was designed specifically for ultra-low-power, single-cell battery-powered applications requiring high-efficiency step-up conversion with true output disconnect-targeting medical, portable, and energy-harvesting systems.
FAQ
What is the minimum input voltage required for LTC3525ESC6-3.3#TRPBF to start switching?
The LTC3525ESC6-3.3#TRPBF requires a minimum input voltage of 0.85V to initiate startup oscillation and begin regulation. It sustains operation down to 0.5V input under light loads once started. This enables reliable operation from aging single-cell alkaline or NiMH batteries where voltage drops below 1.0V.
Does LTC3525ESC6-3.3#TRPBF support input voltages higher than its 3.3V output?
Yes, the LTC3525ESC6-3.3#TRPBF supports VIN ≥ VOUT operation with output disconnect enabled. When VIN exceeds VOUT, the synchronous rectifier disables, resulting in reduced efficiency and lower output current capability-but regulation is maintained without damage or latch-up.
What is the purpose of the dual GND pins (Pins 2 and 5) on LTC3525ESC6-3.3#TRPBF?
The dual GND pins on LTC3525ESC6-3.3#TRPBF provide separate return paths for power ground (Pin 2) and output ground (Pin 5), minimizing ground loop interference and improving stability. Both pins must be connected to the same low-impedance PCB ground plane to ensure accurate regulation and thermal performance.
How does the antiringing control in LTC3525ESC6-3.3#TRPBF reduce EMI?
The LTC3525ESC6-3.3#TRPBF integrates an internal resistor between SW and VIN that activates when inductor current falls to zero. This damps high-frequency ringing at the switch node without requiring external snubber components-reducing radiated EMI and simplifying layout while maintaining high efficiency.
Can LTC3525ESC6-3.3#TRPBF be used with ceramic output capacitors smaller than 10µF?
No-LTC3525ESC6-3.3#TRPBF requires a minimum 10µF X5R/X7R ceramic output capacitor connected close to VOUT and GND pins. Using smaller values risks instability, excessive output ripple (>100mVPP), and failure to maintain regulation under load transients per the datasheet design requirements.
LTC3525ESC6-3.3#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):
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
LTC3525ESC6-3.3#TRPBF FAQ
1.How can I place an order for LTC3525ESC6-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525ESC6-3.3#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 LTC3525ESC6-3.3#TRPBF reliable?
The price and inventory of LTC3525ESC6-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525ESC6-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3525ESC6-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525ESC6-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525ESC6-3.3#TRPBF?
LTC3525ESC6-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525ESC6-3.3#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 LTC3525ESC6-3.3#TRPBF?
For technical support, including LTC3525ESC6-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525ESC6-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3525ESC6-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525ESC6-3.3#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 LTC3525ESC6-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3525ESC6-3.3#TRPBF?
All LTC3525ESC6-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525ESC6-3.3#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 LTC3525ESC6-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3525ESC6-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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