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Analog Devices Inc. LTC3525ESC6-3.3
- Part No.:
- LTC3525ESC6-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525ESC6-3.3.pdf
- Description:
- IC REG BOOST 3.3V 140MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,872
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Product details
Overview
LTC3525ESC6-3.3 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 minimum start-up voltage, and operates in Burst Mode® for ultra-low-power regulation.
For engineers reviewing the LTC3525ESC6-3.3 datasheet, LTC3525ESC6-3.3 pinout, LTC3525ESC6-3.3 application, or LTC3525ESC6-3.3 equivalent, key selection criteria include input start-up capability below 1V, fixed 3.3V output with true output disconnect, SC70-6 package constraints, and efficiency optimization across light-to-moderate loads in portable medical and instrumentation designs.
Technical Context
The LTC3525ESC6-3.3 uses a hysteretic burst-mode control architecture with adaptive peak/valley inductor current modulation-reducing peak current to 150mA at light loads and scaling up to 400mA under heavier loads. Its internal 0.5Ω NMOS switch and 0.8Ω PMOS synchronous rectifier enable high efficiency without external diodes.
Startup begins via an internal oscillator when VIN ≥ 0.85V; normal operation engages only after VOUT exceeds VIN by ≥0.2V and either voltage reaches ≥1.8V. Output disconnect is active during shutdown, limiting inrush and enabling zero-load shutdown current (<1µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.20V–3.40V), internally trimmed for stable rail generation without feedback resistors. |
| Input Start-Up Voltage | 0.85V min-enables direct operation from single alkaline/NiMH cells at end-of-life. |
| Quiescent Current | 7µA typical-maximizes battery runtime in always-on sensor or metering applications. |
| Peak Switch Current | 400mA max-supports up to 140mA output at 3.3V from 1.8V input with proper inductor selection. |
| Shutdown Current | <1µA-ensures negligible battery drain during system sleep or standby modes. |
| Switch On-Resistance | NMOS: 0.5Ω, PMOS: 0.8Ω-minimizes conduction loss and enables >90% efficiency at moderate loads. |
| Operating Junction Temp | –40°C to 125°C-qualified for industrial and extended-temperature embedded environments. |
Pinout & Package
Package: 6-Lead Plastic SC70 (SC6), 1.0mm max height, footprint compatible with IPC-7351 standard solder pad layout.
| 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 compact layouts. |
| VIN (Pin 3) | Main Input 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 | Delivers fixed 3.3V; connects directly to output capacitor (≥10µF ceramic); disconnected from VIN during shutdown. |
| SW (Pin 6) | Internal NMOS Switch Drain | Connects to inductor; integrates antiringing resistor to damp ringing and reduce EMI at switch node. |
Key Features
| Feature | Design Value |
|---|---|
| Output Disconnect | Physically isolates VOUT from VIN during shutdown-eliminates inrush current and enables zero-load battery drain. |
| Burst Mode® Operation | Maintains 7µA IQ across load range while delivering bursts only as needed-avoids audible noise even at light loads. |
| Adaptive Peak Current Limit | Automatically scales from 150mA (light load) to 400mA (heavy load)-optimizes efficiency and output current capability simultaneously. |
| True Synchronous Rectification | Integrates matched NMOS/PMOS switches-removes need for external Schottky diode and improves efficiency by ~10% vs. diode-based boost. |
| Antiringing Control | On-chip resistor across SW–VIN damps LC oscillation at zero-current crossing-reduces EMI without external snubbers. |
Applications
| Glucose Meter Power Supply | Digital Camera Flash Support |
|---|---|
Use Scenario: Portable handheld glucose meters powered by single AA/AAA alkaline cells requiring stable 3.3V for MCU, sensor bias, and LCD backlight. IC Role / Device Role / Timing Role: Primary regulated boost converter supplying 3.3V rail with output disconnect to prevent battery leakage during storage. Use Value: Enables 60mA continuous delivery from 1V input-extending usable battery life beyond conventional charge pumps. | Use Scenario: Low-power digital cameras needing brief 3.3V pulses for LED flash driver ICs during image capture. IC Role / Device Role / Timing Role: Burst-capable boost source delivering short-duration, high-efficiency 3.3V bursts synchronized with camera shutter timing. Use Value: Delivers 140mA at 3.3V from 1.8V input-supporting brighter flash intensity without compromising battery longevity. |
| MP3 Player Audio Codec Bias | Portable Instrument Sensor Excitation |
Use Scenario: Battery-powered MP3 players requiring clean, low-noise 3.3V for audio codec and DAC circuitry. IC Role / Device Role / Timing Role: Low-ripple, low-quiescent-current boost regulator powering analog signal chain components. Use Value: Achieves ≤60mVpp ripple with 22µF output capacitor-meeting SNR requirements for 16-bit audio playback. | Use Scenario: Handheld test instruments using precision resistive or capacitive sensors requiring stable excitation voltage. IC Role / Device Role / Timing Role: Precision-regulated 3.3V source with tight load regulation (±2.5% over 0–60mA) for sensor bridge biasing. Use Value: Maintains <±2.5% output deviation across full load range-ensuring measurement repeatability in field-deployed equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3429ESC6-3.3 | Higher peak switch current (600mA), same SC70-6 package, but requires external feedback resistors for 3.3V output. | Supports higher output currents (up to 100mA at 3.3V from 1.8V) and wider input range (1V–4.5V). | Select when >60mA sustained output or programmable VOUT is required; trade-off is added resistor network and slightly higher IQ (20µA). |
| LTC3528EDC-3.3 | DFN-8 (2mm × 3mm), 700mV start-up, 1A switch, integrated soft-start, no output disconnect. | Targets higher-power applications (e.g., Bluetooth modules) where board space allows larger package and output disconnect is not mandatory. | Choose for higher current capability and lower profile (0.75mm), but verify system-level need for output disconnect before substitution. |
Compared with LTC3525ESC6-3.3, LTC3429ESC6-3.3 offers greater current headroom at the cost of design complexity, while LTC3528EDC-3.3 trades output disconnect and ultra-low IQ for higher power density and current capacity-making each suitable for distinct power budget and feature priorities.
Availability
LTC3525ESC6-3.3 is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power consumer electronics requiring stable component supply with guaranteed long-term sourcing.
Supply support for LTC3525ESC6-3.3 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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3525 family.
The LTC3525 product line was engineered specifically for ultra-low-power, single-cell battery applications demanding high efficiency below 1V input-targeting glucose meters, portable sensors, and compact audio devices where size and battery life are critical.
FAQ
What is the minimum input voltage required for LTC3525ESC6-3.3 to start switching?
The LTC3525ESC6-3.3 can initiate startup with an input voltage as low as 0.85V. However, it remains in start-up mode until two conditions are met: VOUT exceeds VIN by at least 0.2V (typical), and either VIN or VOUT rises above 1.8V (typical). This ensures reliable regulation before full operation begins. The LTC3525ESC6-3.3 achieves this using an internal oscillator and controlled inductor current ramp.
Does LTC3525ESC6-3.3 support operation when VIN ≥ VOUT?
Yes, the LTC3525ESC6-3.3 supports VIN ≥ VOUT operation due to its output disconnect architecture. When VIN ≥ VOUT, the synchronous rectifier is disabled, and the device operates in pass-through mode with reduced efficiency and lower output current capability. The LTC3525ESC6-3.3 maintains regulation but relies on the output capacitor to supply load current during this condition.
What is the recommended output capacitor value for LTC3525ESC6-3.3?
The minimum recommended output capacitor for LTC3525ESC6-3.3 is 10µF ceramic (X5R or X7R dielectric). Using 22µF reduces output ripple from ~60mVpp to ~20mVpp at full load. Capacitors larger than 47µF increase light-load peak inductor current unnecessarily, degrading efficiency-so 10µF to 22µF is optimal. The LTC3525ESC6-3.3 datasheet specifies placement close to VOUT and GND pins for best performance.
How does the SHDN pin function on LTC3525ESC6-3.3, and what voltage thresholds apply?
The SHDN pin on LTC3525ESC6-3.3 enables or disables the converter: logic high (>1V) activates regulation; logic low (<0.4V) forces shutdown with true output disconnect and <1µA current draw. Voltages between 0.4V and 1V must be avoided-especially those exceeding VIN or VOUT by >0.4V-as they may engage a proprietary test mode that disrupts PWM operation. The LTC3525ESC6-3.3 requires careful SHDN drive design in high-VIN systems.
What is the thermal performance of LTC3525ESC6-3.3 in the SC70-6 package?
The LTC3525ESC6-3.3 in the SC70-6 package has a junction-to-ambient thermal resistance (θJA) of 256°C/W in free air and 150°C/W on a PCB with ground plane. Its maximum junction temperature is 125°C, and it includes thermal shutdown protection. Under typical 60mA load at 3.3V output, power dissipation remains low (<100mW), keeping junction temperature well within limits-even in compact enclosures. The LTC3525ESC6-3.3's 1mm profile also aids heat spreading in thin-form-factor designs.
LTC3525ESC6-3.3 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):
- 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 FAQ
1.How can I place an order for LTC3525ESC6-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525ESC6-3.3 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 LTC3525ESC6-3.3 reliable?
The price and inventory of LTC3525ESC6-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525ESC6-3.3 is usually 5 days.
3.What payment methods are accepted for LTC3525ESC6-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525ESC6-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525ESC6-3.3?
LTC3525ESC6-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525ESC6-3.3 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 LTC3525ESC6-3.3?
For technical support, including LTC3525ESC6-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525ESC6-3.3 requirements.
6.How does Aetrix verify that LTC3525ESC6-3.3 is sourced from the original manufacturer or authorized distributors?
All LTC3525ESC6-3.3 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 LTC3525ESC6-3.3 meets industry standards.
7.What is the process for return or replacement of LTC3525ESC6-3.3?
All LTC3525ESC6-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525ESC6-3.3, 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 LTC3525ESC6-3.3 part is unused and in its original packaging.
Return procedure for LTC3525ESC6-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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