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Analog Devices Inc. LTC3525ESC6-3.3#TRMPBF
- Part No.:
- LTC3525ESC6-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525ESC6-3.3#TRMPBF.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,512
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Product details
Overview
LTC3525ESC6-3.3#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.
For engineers reviewing the LTC3525ESC6-3.3#TRMPBF datasheet, LTC3525ESC6-3.3#TRMPBF pinout, LTC3525ESC6-3.3#TRMPBF application, or LTC3525ESC6-3.3#TRMPBF equivalent, key selection criteria include ultralow 7µA quiescent current, 0.5Ω NMOS/0.8Ω PMOS switch RDS(on), SC70-6 package footprint, output disconnect capability, and Burst Mode® operation for light-load efficiency.
Technical Context
The LTC3525ESC6-3.3#TRMPBF implements 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 N-channel switch and 0.8Ω P-channel synchronous rectifier eliminate external diode requirements while enabling true output disconnect during shutdown.
Startup uses a dedicated oscillator to bootstrap operation below 1V; once VOUT exceeds VIN by ≥0.2V and either rail surpasses 1.8V, it transitions to normal synchronous mode. Antiringing circuitry across SW–VIN minimizes EMI, and thermal shutdown protects against sustained overloads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.20V–3.40V), internally trimmed-no feedback resistor required. |
| Input Start-Up Voltage | 0.85V minimum-enables operation directly from single alkaline/NiMH cells at end-of-life. |
| Quiescent Current | 7µA typical (VOUT supply path)-maximizes battery runtime in always-on portable devices. |
| Shutdown Current | <1µA-ensures zero-load battery drain during system sleep modes. |
| Peak Switch Current | 400mA maximum-supports up to 140mA output at 3.3V from 1.8V input with proper inductor selection. |
| Efficiency | Up to 95% at 60mA load (VIN = 1.8V) - exceeds charge pump alternatives in low-input-voltage applications. |
| Package | 6-Lead SC70 (2.2mm × 1.35mm × 1.0mm)-ultra-compact footprint for space-constrained wearables and medical sensors. |
Pinout & Package
Package: 6-Lead Plastic SC70 (JEDEC MO-203 AB, EIAJ SC-70), 1.0mm max height, −40°C to +85°C operating junction temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pulled high (>1V) to enable; pulled low (<0.4V) to disable with true output disconnect and <1µA shutdown current. |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins reduce PCB trace inductance and improve thermal dissipation in high-frequency switching. |
| VIN (Pin 3) | Main Input Power Supply | Accepts 0.85V–6V; powers IC until VOUT > VIN + 0.2V, then auto-switches to VOUT supply path. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers fixed 3.3V; connects to output capacitor (min. 10µF ceramic); disconnected from VIN during shutdown. |
| SW (Pin 6) | Switch Node | Drives external inductor; integrates antiringing resistor between SW and VIN to suppress ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains 7µA quiescent current across load range-critical for multi-year battery life in glucose meters and remote sensors. |
| True Output Disconnect | Isolates VOUT from VIN during shutdown-prevents backfeed, eliminates inrush current, and enables safe hot-swap of power sources. |
| Synchronous Rectification | Integrated 0.5Ω NMOS and 0.8Ω PMOS switches replace Schottky diode-eliminates 0.3V forward drop loss and improves efficiency by ~10% vs. diode-based boosters. |
| Antiringing Control | Internal resistor across SW–VIN damps LC oscillation at zero-current crossing-reduces EMI without external snubbers. |
| Low-Profile SC70 Package | 1.0mm max height-fits beneath 1.2mm stacked PCB assemblies in ultra-thin MP3 players and hearing aids. |
Applications
| Glucose Meters | Digital Cameras |
|---|---|
Use Scenario: Portable handheld device powered by single AAA alkaline cell requiring stable 3.3V rail for microcontroller, LCD, and sensor interface. IC Role / Device Role / Timing Role: Primary voltage booster enabling operation down to 0.85V input-extends usable battery life beyond conventional charge pumps. Use Value: Delivers 60mA at 3.3V from 1V input with 95% efficiency, reducing battery replacement frequency by 30% versus legacy solutions. | Use Scenario: Compact digital camera with flash LED requiring regulated 3.3V for image sensor and memory interface during burst capture. IC Role / Device Role / Timing Role: Synchronous step-up converter supplying clean, ripple-controlled 3.3V during high-current sensor readout phases. Use Value: 20mVPP output ripple (light load) and 60mVPP (full load) prevent image noise artifacts in CMOS sensor analog front-end. |
| MP3 Players | Portable Instruments |
Use Scenario: Battery-powered audio player using single Li-Ion cell (2.7–4.2V) needing regulated 3.3V for DAC, codec, and display driver. IC Role / Device Role / Timing Role: Efficient boost converter supporting VIN ≥ VOUT operation-maintains regulation even when battery drops below 3.3V. Use Value: Output disconnect prevents reverse current flow into depleted battery, preserving remaining capacity and preventing thermal stress. | Use Scenario: Handheld test equipment powered by dual NiMH cells (1.2–2.4V) requiring precise 3.3V reference for ADC and signal conditioning. IC Role / Device Role / Timing Role: Micropower DC/DC regulator delivering low-noise, tightly regulated 3.3V with minimal load transient deviation. Use Value: Load regulation ≤±2.5% across 0–140mA ensures ADC reference stability within 0.1% full-scale error over entire operating range. |
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 |
|---|---|---|---|
| LTC3429ESC6#TRMPBF | Same SC70-6 package; 5V output option; higher 600mA peak switch current; 500kHz fixed frequency vs. burst mode. | Optimized for higher-output-voltage systems (e.g., 5V logic rails); less suitable for ultra-low-IQ applications due to 20µA quiescent current. | Select LTC3429ESC6#TRMPBF when fixed 5V output and higher current capability outweigh 3× higher IQ. |
| LTC3528EDD#TRMPBF | 2mm × 3mm DFN-8 package; 700mV start-up; 1A peak current; 12µA IQ; supports adjustable output via feedback resistors. | Requires external feedback network; larger footprint; better suited for industrial designs needing flexibility and higher output current. | Select LTC3528EDD#TRMPBF when adjustable output voltage, higher current (≥100mA), or extended temperature range (−40°C to +125°C) is required. |
Compared with LTC3429ESC6#TRMPBF and LTC3528EDD#TRMPBF, the LTC3525ESC6-3.3#TRMPBF offers the lowest quiescent current (7µA) and smallest footprint (SC70-6), making it optimal for space- and battery-limited consumer medical and audio devices where fixed 3.3V output suffices.
Availability
LTC3525ESC6-3.3#TRMPBF is available at Aetrix Electronics and suitable for glucose meters, portable instruments, MP3 players, digital cameras, and other battery-powered electronics requiring stable component supply with long-term manufacturability.
Supply support for LTC3525ESC6-3.3#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; Linear pioneered high-performance analog ICs including precision DC/DC converters, references, and signal conditioning products.
The LTC3525ESC6-3.3#TRMPBF belongs to Linear's micropower synchronous boost converter family, engineered specifically for ultra-low-power, single-cell battery applications where minimal board area and maximum runtime are critical design constraints.
FAQ
What is the minimum input voltage required for the LTC3525ESC6-3.3#TRMPBF to start switching?
The LTC3525ESC6-3.3#TRMPBF starts switching with an input voltage as low as 0.85V-verified across temperature and process corners. This allows reliable operation from a single alkaline or NiMH cell near end-of-life. Startup requires both VIN ≥ 0.85V and sufficient load capacitance (≥10µF) on VOUT to sustain initial charge transfer.
Does the LTC3525ESC6-3.3#TRMPBF support operation when input voltage exceeds the 3.3V output?
Yes, the LTC3525ESC6-3.3#TRMPBF supports VIN ≥ VOUT operation. When VIN ≥ VOUT, the internal P-channel synchronous rectifier is disabled, and the device regulates using only the N-channel switch-resulting in lower efficiency and reduced output current capability but maintaining voltage regulation without damage.
How does the output disconnect feature function in the LTC3525ESC6-3.3#TRMPBF during shutdown?
When SHDN is pulled below 0.4V, the LTC3525ESC6-3.3#TRMPBF disables both internal switches and physically disconnects VOUT from VIN using integrated MOSFET isolation. This prevents backfeed, eliminates inrush current on power-up, and reduces shutdown current to <1µA-critical for battery-backed systems requiring zero standby drain.
What external components are mandatory for basic operation of the LTC3525ESC6-3.3#TRMPBF?
The LTC3525ESC6-3.3#TRMPBF requires exactly three external components: a 10µH inductor (e.g., Murata LQH32CN100K53), a 10µF ceramic output capacitor (X5R/X7R dielectric), and a 1µF ceramic input bypass capacitor. No feedback resistors, compensation networks, or Schottky diodes are needed due to its fixed-output, synchronous architecture.
What is the typical output voltage ripple of the LTC3525ESC6-3.3#TRMPBF under full load?
The LTC3525ESC6-3.3#TRMPBF delivers 60mVPP output voltage ripple at full load (60mA) using the recommended 10µF ceramic output capacitor. With a 22µF capacitor, ripple drops to ~40mVPP. Ripple is measured differentially across VOUT–GND with 20MHz bandwidth limit and reflects combined switching and load-transient effects.
LTC3525ESC6-3.3#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
LTC3525ESC6-3.3#TRMPBF FAQ
1.How can I place an order for LTC3525ESC6-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525ESC6-3.3#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 LTC3525ESC6-3.3#TRMPBF reliable?
The price and inventory of LTC3525ESC6-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525ESC6-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3525ESC6-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525ESC6-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525ESC6-3.3#TRMPBF?
LTC3525ESC6-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525ESC6-3.3#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 LTC3525ESC6-3.3#TRMPBF?
For technical support, including LTC3525ESC6-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525ESC6-3.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3525ESC6-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525ESC6-3.3#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 LTC3525ESC6-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3525ESC6-3.3#TRMPBF?
All LTC3525ESC6-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525ESC6-3.3#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 LTC3525ESC6-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3525ESC6-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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