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Analog Devices Inc. LTC3525ESC6-3
- Part No.:
- LTC3525ESC6-3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525ESC6-3.pdf
- Description:
- IC REG BOOST 3V 65MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,538
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Product details
Overview
LTC3525ESC6-3 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 delivers up to 60mA at 3.3V from a 1V input, features 7µA quiescent current, 0.85V start-up voltage, and fixed 3.3V output in a 6-lead SC70 package-ideal for glucose meters and portable instrumentation.
For engineers reviewing the LTC3525ESC6-3 datasheet, LTC3525ESC6-3 pinout, LTC3525ESC6-3 application, or LTC3525ESC6-3 equivalent, key selection criteria include ultralow IQ, true output disconnect, burst-mode efficiency at light loads, and compatibility with 10µH inductors and ceramic capacitors in space-constrained designs.
Technical Context
The LTC3525ESC6-3 implements a hysteretic burst-mode control architecture with adaptive peak/valley inductor current regulation (150–400mA range), enabling high efficiency across load currents from 10µA to 140mA. Its internal 0.5Ω NMOS switch and 0.8Ω PMOS synchronous rectifier eliminate external diode losses.
Startup uses a dedicated oscillator to bootstrap operation from ≤0.85V input; once VOUT exceeds VIN by ≥0.2V and either rail reaches ≥1.8V, it transitions to normal synchronous operation. Output disconnect is enforced during shutdown via internal PMOS gate control, yielding <1µA shutdown current and zero inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.20V–3.40V) - ensures stable rail for 3.3V logic without external feedback. |
| Input Start-Up Voltage | 0.85V min - enables operation from single alkaline/NiMH cells at end-of-life. |
| Quiescent Current | 7µA typical - maximizes battery runtime in always-on sensor nodes. |
| Peak Switch Current | 400mA max - supports 140mA output at 1.8V input while maintaining regulation. |
| Shutdown Current | <1µA - eliminates standby drain in power-gated subsystems. |
| Package | 6-Lead SC70 (1.8mm × 1.3mm × 1.0mm) - fits ultra-thin portable devices with 1mm profile constraint. |
| Operating Junction Temp | –40°C to 85°C - qualified for industrial and medical handheld environments. |
Pinout & Package
6-Lead Plastic SC70 package (JEDEC MO-203 AB, EIAJ SC-70), 1.0mm max height, 0.65mm pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pull <0.4V to disable; pull >1V to enable - prevents inadvertent test mode activation when driven above VIN. |
| 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 0.85V–6V; powers IC until VOUT > VIN + 0.2V, then switches to VOUT supply path. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Internal feedback reference tied to this pin; output disconnect isolates load during shutdown. |
| SW (Pin 6) | Switch Node | Connects to inductor; integrates antiringing resistor to suppress EMI at zero-current crossing. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | Zero inrush current and complete isolation of VOUT from VIN during shutdown - critical for system-level power sequencing. |
| Burst Mode® Operation | 7µA IQ maintained across full load range - preserves efficiency down to µA-level loads without pulse-skipping artifacts. |
| Adaptive Peak Current Limit | 150mA at light loads → 400mA at heavy loads - balances conduction loss vs. switching loss automatically. |
| Antiringing Control | Integrated resistor across SW–VIN - reduces EMI without external snubbers or layout compromises. |
| Start-Up Oscillator | Enables boot from 0.85V input using only internal circuitry - eliminates need for external charge pumps or boost assist. |
Applications
| Portable Medical Sensors | Low-Power Instrumentation |
|---|---|
Use Scenario: Glucose meter operating from single AAA alkaline cell with intermittent 3.3V MCU and sensor bias rails. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator with output disconnect to prevent battery drain during sleep. Use Value: 7µA quiescent current extends battery life to >1 year; 0.85V start-up ensures operation until cell voltage drops below 1V. | Use Scenario: Handheld multimeter requiring stable 3.3V supply for ADC and display, powered by two NiMH cells. IC Role / Device Role / Timing Role: Synchronous boost converter delivering regulated 3.3V with minimal ripple during measurement bursts. Use Value: 95% peak efficiency and 60mVpp output ripple (with 22µF cap) ensure accurate low-noise analog measurements. |
| Wearable Audio Devices | IoT Edge Nodes |
Use Scenario: MP3 player with flash memory and audio codec, powered by single Li-Ion cell (2.8–4.2V). IC Role / Device Role / Timing Role: Generates clean 3.3V rail for digital logic and memory interface, active only during playback. Use Value: Output disconnect prevents backfeed into boost circuit during shutdown; 140mA capability supports bursty memory access. | Use Scenario: Wireless sensor node (BLE + MCU + environmental sensors) powered by coin cell or energy harvester. IC Role / Device Role / Timing Role: Micropower voltage booster enabling 3.3V operation from sub-1V sources like thermoelectric or piezoelectric harvesters. Use Value: 0.85V start-up and 7µA IQ allow direct integration with ultra-low-power energy harvesting front-ends. |
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#TRMPBF | Same SC70 package; 5V output option; 20µA IQ; no output disconnect | Lacks true output disconnect - unsuitable where zero shutdown leakage is required | Select LTC3525ESC6-3 when output isolation and sub-1µA shutdown are mandatory |
| LTC3528EDD#TRMPBF | 2mm × 3mm DFN; 700mV start-up; 12µA IQ; 1A output capability | Higher pin count (8-pin), larger footprint, higher IQ - trades size for higher current | Choose LTC3525ESC6-3 for minimal footprint and lowest IQ in ≤140mA applications |
Compared with LTC3429ESC6#TRMPBF and LTC3528EDD#TRMPBF, the LTC3525ESC6-3 uniquely combines SC70 packaging, true output disconnect, and 7µA IQ - making it optimal for space- and battery-limited medical and portable instrumentation where zero standby drain is non-negotiable.
Availability
LTC3525ESC6-3 is available at Aetrix Electronics and suitable for portable medical devices, low-power instrumentation, wearable audio systems, and IoT edge nodes requiring stable component supply with long-term lifecycle support.
Supply support for LTC3525ESC6-3 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 precision analog and power management portfolio. Linear pioneered high-efficiency micropower DC/DC conversion for battery-operated systems.
The LTC3525 family was designed specifically for ultra-low-power, single-cell battery applications demanding minimal board area, true output disconnect, and extended runtime - targeting medical, portable, and energy-harvesting use cases.
FAQ
What is the minimum input voltage required for LTC3525ESC6-3 to start switching?
The LTC3525ESC6-3 starts switching with an input voltage as low as 0.85V, enabled by its dedicated start-up oscillator. This allows reliable operation from nearly depleted single alkaline or NiMH cells. Once started, it can maintain regulation down to ~0.5V depending on load, though full output current capability requires higher VIN.
Does LTC3525ESC6-3 provide true output disconnect, and how does it behave during shutdown?
Yes, LTC3525ESC6-3 provides true output disconnect: when SHDN is pulled below 0.4V, the internal PMOS switch opens, completely isolating VOUT from VIN. This results in zero inrush current at startup and <1µA shutdown current, preventing battery drain in unpowered states - a key differentiator versus basic boost converters.
What inductor value is recommended for optimal performance with LTC3525ESC6-3?
A 10µH inductor is recommended for LTC3525ESC6-3 as the best compromise between size and efficiency. Ferrite-based types rated for ≥400mA peak current (e.g., Murata LQH32CN100K53 or Coilcraft LPO3310-682MXD) are validated. Values between 4.7µH and 15µH are acceptable, but lower values increase switching frequency without reducing output ripple.
Can LTC3525ESC6-3 operate with input voltage higher than its 3.3V output?
Yes, LTC3525ESC6-3 supports VIN ≥ VOUT operation (e.g., 3.6V input to 3.3V output), but in this mode the synchronous rectifier is disabled. The device relies on body-diode conduction, resulting in reduced efficiency and lower maximum output current - intended only for transient conditions, not continuous operation.
What is the typical output voltage ripple of LTC3525ESC6-3 under full load?
With a 22µF X5R/X7R ceramic output capacitor, LTC3525ESC6-3 delivers ≤60mV peak-to-peak output ripple at full load (140mA @ 1.8V input). Using the minimum 10µF capacitor yields ~60mVpp at 60mA, but ripple increases at higher currents - hence 22µF is recommended for noise-sensitive analog circuits.
LTC3525ESC6-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 65mA
- 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 FAQ
1.How can I place an order for LTC3525ESC6-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525ESC6-3 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 reliable?
The price and inventory of LTC3525ESC6-3 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 is usually 5 days.
3.What payment methods are accepted for LTC3525ESC6-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525ESC6-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525ESC6-3?
LTC3525ESC6-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525ESC6-3 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?
For technical support, including LTC3525ESC6-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525ESC6-3 requirements.
6.How does Aetrix verify that LTC3525ESC6-3 is sourced from the original manufacturer or authorized distributors?
All LTC3525ESC6-3 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 meets industry standards.
7.What is the process for return or replacement of LTC3525ESC6-3?
All LTC3525ESC6-3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525ESC6-3, 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 part is unused and in its original packaging.
Return procedure for LTC3525ESC6-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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