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Analog Devices Inc. LTC3525ESC6-3#TRMPBF
- Part No.:
- LTC3525ESC6-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525ESC6-3#TRMPBF.pdf
- Description:
- IC REG BOOST 3V 65MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,329
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Product details
Overview
LTC3525ESC6-3#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 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#TRMPBF datasheet, LTC3525ESC6-3#TRMPBF pinout, LTC3525ESC6-3#TRMPBF application, or LTC3525ESC6-3#TRMPBF equivalent, key selection criteria include input start-up voltage (0.85V), output disconnect capability, SC70-6 package footprint, burst-mode operation, and thermal shutdown protection-critical for space-constrained, battery-sensitive designs.
Technical Context
The LTC3525ESC6-3#TRMPBF integrates a 0.5Ω N-channel MOSFET switch and 0.8Ω P-channel synchronous rectifier, enabling high-efficiency boost conversion without an external diode. Its Burst Mode® operation dynamically adjusts peak inductor current from 150mA (light load) to 400mA (full load), optimizing conduction losses while maintaining regulation across input voltages from 0.85V to 6V.
Startup is managed by an internal oscillator that enables operation below 1V input; once VOUT exceeds VIN by ≥0.2V and either rail reaches ≥1.8V, synchronous rectification engages. Output disconnect isolates VOUT from VIN during shutdown, limiting inrush and achieving <1µA shutdown current-essential for zero-leakage power gating in medical sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.00V ±3% (2.91V–3.09V); ensures stable supply for 3V logic and analog circuitry without external feedback resistors. |
| Input Start-Up Voltage | 0.85V min; enables reliable startup from partially discharged single alkaline or NiMH cells (e.g., down to ~0.9V under load). |
| Quiescent Current | 7µA typical (VIN); extends battery life in always-on monitoring devices such as wearable glucose sensors. |
| Peak Switch Current | 400mA max; supports up to 150mA output at 3V when VIN ≥1.8V, sufficient for LCD bias, RF transceivers, and sensor signal chains. |
| Shutdown Current | <1µA; eliminates standby drain, enabling true zero-power sleep modes in portable instruments. |
| Switching Frequency | ~1MHz (VIN = 2.4V); balances EMI control and inductor size-compatible with compact 10µH ferrite inductors like Murata LQH32CN100K53. |
| Operating Junction Temp | –40°C to 125°C; validated for industrial-grade reliability in handheld test equipment and field-deployed medical devices. |
Pinout & Package
Package: 6-Lead Plastic SC70 (SC6), 1.0mm max height, 2.0mm × 1.25mm footprint-optimized for ultra-thin portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Logic-Controlled Shutdown Input | Pull <0.4V to disable IC; pull >1V to enable; prevents inadvertent activation in low-voltage brownout conditions. |
| GND (Pins 2, 5) | Power Ground Reference | Dual ground pins reduce PCB trace inductance and improve thermal dissipation in high-frequency switching paths. |
| VIN (Pin 3) | Main Power Input | Supplies IC until VOUT > VIN + 0.2V; accepts 0.85V–6V; requires ≥1µF ceramic bypass capacitor adjacent to pin. |
| VOUT (Pin 4) | Regulated Output & Sense Node | Delivers fixed 3V; connects to ≥10µF ceramic output capacitor; provides true output disconnect during shutdown. |
| SW (Pin 6) | Internal Switch Node | Drives external inductor; includes integrated antiringing resistor to suppress EMI at zero-current crossing. |
Key Features
| Feature | Design Value |
|---|---|
| Output Disconnect | Physically isolates VOUT from VIN during shutdown-eliminates inrush current and enables zero-load leakage in battery-backed systems. |
| Burst Mode® Operation | Maintains 7µA IQ across load range; reduces light-load power loss by dynamically scaling peak inductor current (150mA → 400mA). |
| Synchronous Rectification | Replaces external Schottky diode with 0.8Ω P-channel switch-improves efficiency by ~10% vs. diode-based boost converters at 10–100mA loads. |
| Antiringing Control | Integrated resistor across SW–VIN damps LC ringing at switch turn-off-reduces conducted EMI without requiring external snubbers. |
| Thermal Shutdown | Activates at TJ ≥125°C and latches off until cooldown-protects against sustained overload in sealed enclosures or high-ambient environments. |
Applications
| Glucose Meters | Portable Instrumentation |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration using electrochemical test strips. IC Role / Device Role / Timing Role: Provides regulated 3V rail for microcontroller, ADC, and sensor bias from a single 1.5V alkaline cell. Use Value: 0.85V start-up and 7µA quiescent current extend usable battery life beyond 1,000 tests per AA cell. |
Use Scenario: Handheld multimeter or environmental sensor logger operating on two NiMH cells (2.4V nominal). IC Role / Device Role / Timing Role: Generates stable 3V supply for precision op-amps, reference ICs, and low-power MCU during measurement cycles. Use Value: Output disconnect prevents backfeed into depleted batteries; 95% efficiency minimizes self-heating during continuous 60mA operation. |
| MP3 Players | Digital Cameras |
Use Scenario: Flash-memory-based audio player with OLED display requiring clean 3V supply from single Li-Ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Boosts voltage when battery drops below 3.0V; maintains display brightness and DAC performance during discharge. Use Value: Supports VIN ≥ VOUT operation (3.0V–4.2V input) with pass-through mode fallback-no external OR-ing required. |
Use Scenario: Compact digital camera using CMOS image sensor and flash LED requiring 3V logic and 5V flash driver supply. IC Role / Device Role / Timing Role: Supplies 3V to sensor interface and controller; paired with LTC3525-5 variant for flash charging. Use Value: SC70-6 package fits tight board real estate; 1mm profile allows integration beneath OLED displays or lens modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3529EDD#TRMPBF | Higher output current (1.5A), 1.5MHz switching, no output disconnect, DFN-8 package (2mm × 3mm). | Requires external diode for reverse isolation; better suited for higher-power loads like Wi-Fi modules where disconnect is not critical. | Select when >150mA continuous output is needed and board area permits larger DFN package. |
| LTC3528EDD#TRMPBF | 700mV start-up, 1A output, 1MHz, output disconnect, DFN-8 package (2mm × 3mm), 12µA IQ. | Lower start-up voltage but higher quiescent current; optimized for dual-cell Li-Ion (2.7–4.2V) rather than single alkaline. | Prefer for newer designs targeting longer shelf life and lower minimum input, accepting trade-off in IQ and footprint. |
Compared with LTC3525ESC6-3#TRMPBF, LTC3529EDD#TRMPBF offers greater power delivery but lacks output disconnect-making it unsuitable for zero-leakage shutdown-while LTC3528EDD#TRMPBF improves start-up margin at the cost of 71% higher quiescent current, reducing battery life in ultra-low-power applications.
Availability
LTC3525ESC6-3#TRMPBF is available at Aetrix Electronics and suitable for glucose meters, portable instrumentation, and MP3 players requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3525ESC6-3#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 full product support, documentation, and manufacturing continuity for all Linear-branded power ICs.
The LTC3525 family was designed specifically for micropower, space-constrained battery-powered applications-emphasizing ultra-low IQ, minimal external components, and robust start-up from weak primary cells.
FAQ
What is the minimum input voltage required for LTC3525ESC6-3#TRMPBF to start switching?
The LTC3525ESC6-3#TRMPBF starts switching with an input voltage as low as 0.85V. This is verified across temperature and process corners per the datasheet's Absolute Maximum Ratings table. Startup requires both VOUT exceeding VIN by ≥0.2V and either VIN or VOUT reaching ≥1.8V-ensuring reliable operation even from deeply discharged alkaline cells. The LTC3525ESC6-3#TRMPBF achieves this using an internal start-up oscillator independent of the main PWM circuit.
Does LTC3525ESC6-3#TRMPBF support output voltages higher than its fixed 3V setting?
No, LTC3525ESC6-3#TRMPBF has a factory-trimmed internal feedback network set exclusively for 3.00V ±3%. It does not support adjustable output via external resistors. For 3.3V or 5V outputs, engineers must select the pin-compatible variants LTC3525ESC6-3.3#TRMPBF or LTC3525ESC6-5#TRMPBF-each with identical SC70-6 packaging, pinout, and feature set.
How does the output disconnect feature function in LTC3525ESC6-3#TRMPBF during shutdown?
When SHDN is pulled below 0.4V, LTC3525ESC6-3#TRMPBF disables both internal MOSFETs and opens the connection between VIN and VOUT-physically isolating the output capacitor from the input source. This prevents backfeed, eliminates inrush current at power-up, and ensures <1µA total shutdown current. The LTC3525ESC6-3#TRMPBF maintains this state until SHDN rises above 1V, after which a 20–120µs delay precedes switching resumption.
What is the recommended inductor value for optimal efficiency with LTC3525ESC6-3#TRMPBF?
A 10µH ferrite inductor is recommended for LTC3525ESC6-3#TRMPBF, balancing size, efficiency, and ripple performance. Examples include Murata LQH32CN100K53 or Coilcraft LPO3310-682MXD. Inductors must handle ≥400mA peak current without saturation and exhibit low DC resistance. Values between 4.7µH and 15µH are acceptable, but deviations outside this range may increase EMI or reduce light-load efficiency due to altered burst frequency.
Can LTC3525ESC6-3#TRMPBF operate with input voltage equal to or greater than its 3V output?
Yes, LTC3525ESC6-3#TRMPBF supports VIN ≥ VOUT operation (e.g., 3.3V input to 3V output). In this mode, the synchronous rectifier is disabled and the P-channel switch acts as a follower-allowing pass-through with ~0.2V dropout. However, efficiency drops significantly versus boost mode, and maximum output current is reduced. The LTC3525ESC6-3#TRMPBF maintains regulation but should be used in this mode only for transient input overshoot tolerance-not continuous operation.
LTC3525ESC6-3#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):
- 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#TRMPBF FAQ
1.How can I place an order for LTC3525ESC6-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525ESC6-3#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#TRMPBF reliable?
The price and inventory of LTC3525ESC6-3#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3525ESC6-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525ESC6-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525ESC6-3#TRMPBF?
LTC3525ESC6-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525ESC6-3#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#TRMPBF?
For technical support, including LTC3525ESC6-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525ESC6-3#TRMPBF requirements.
6.How does Aetrix verify that LTC3525ESC6-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3525ESC6-3#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3525ESC6-3#TRMPBF?
All LTC3525ESC6-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525ESC6-3#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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3525ESC6-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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