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Analog Devices Inc. LTC3525ISC6-5
- Part No.:
- LTC3525ISC6-5
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
LTC3525ISC6-5.pdf
- Description:
- IC REG BOOST 5V 175MA SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
LTC3525ISC6-5 from Analog Devices (formerly Linear Technology) is a high-efficiency, synchronous step-up DC/DC converter with output disconnect, designed for single- or dual-cell alkaline/NiMH or Li-Ion battery-powered systems. It starts up from as low as 0.85V input, delivers fixed 5V output, supports up to 175mA load from 3V input, and features ultralow 8µA typical quiescent current and <1µA shutdown current - enabling extended battery life in portable medical and instrumentation devices.
For engineers reviewing the LTC3525ISC6-5 datasheet, LTC3525ISC6-5 pinout, LTC3525ISC6-5 application, or LTC3525ISC6-5 equivalent, key selection criteria include input start-up voltage (0.85V), output disconnect capability, SC70-6 package thermal performance (θJA = 150°C/W on ground plane), and Burst Mode® operation for micropower efficiency at light loads.
Technical Context
The LTC3525ISC6-5 employs a hysteretic burst-mode control architecture with adaptive peak/valley inductor current regulation - lowering peak current to 150mA at light loads and scaling up to 400mA under heavy load to optimize conduction loss vs. switching loss trade-offs. Its internal 0.4Ω NMOS switch and 0.7Ω PMOS synchronous rectifier enable high efficiency without external diodes.
Startup uses a dedicated oscillator to bootstrap operation below 1V; once VOUT exceeds VIN by ≥0.2V and either voltage reaches ≥1.8V, it transitions to normal synchronous mode. Output disconnect is implemented via PMOS gate control during shutdown, eliminating inrush and enabling true zero-load current draw from the source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±1.5% (guaranteed over –40°C to 125°C junction temp) |
| Input Start-Up Voltage | 0.85V min - enables direct startup from single NiMH/alkaline cell |
| Quiescent Current (Active) | 8µA typical - sustains >90% efficiency down to 100µA load |
| Peak Switch Current | 400mA max - supports 175mA output at 3V input with 95% efficiency |
| Shutdown Current | <1µA - ensures negligible battery drain during system sleep |
| Switch On-Resistance | NMOS: 0.4Ω, PMOS: 0.7Ω - reduces conduction loss and thermal rise in SC70 package |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and automotive under-hood adjacent applications |
Pinout & Package
Package: 6-Lead Plastic SC70 (SC6), 1.0mm max height, JEDEC MO-203 AB / EIAJ SC-70 compliant. Thermal resistance θJA = 150°C/W on PCB with ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Logic-Controlled Shutdown Input | Pulled <0.4V disables converter and activates output disconnect; driven >1V enables operation |
| 2 - GND | Power Ground (Primary) | Reference for VIN, VOUT, and SW; must be low-impedance connection to minimize noise and thermal rise |
| 3 - VIN | Main Input Supply Pin | Accepts 0.85V–6V; powers IC until VOUT > VIN + 0.2V, then switches to VOUT supply path |
| 4 - VOUT | Regulated Output & Sense Node | Delivers fixed 5V; internal feedback loop regulates here; output disconnect isolates this node from VIN in shutdown |
| 5 - GND | Power Ground (Secondary) | Dual-GND configuration improves EMI immunity and thermal dissipation in compact layout |
| 6 - SW | Switch Node | Connects to inductor; internal antiringing resistor minimizes EMI when inductor current falls to zero |
Key Features
| Feature | Design Value |
|---|---|
| Output Disconnect | True hardware disconnect between VIN and VOUT during shutdown - eliminates inrush and enables zero-source current draw |
| Burst Mode® Operation | 7–8µA quiescent current with automatic burst frequency adjustment - avoids audible noise while maintaining light-load efficiency |
| Adaptive Peak Current Limit | 150mA → 400mA scaling with load - reduces switching loss at light loads and conduction loss at heavy loads |
| Integrated Synchronous Rectification | 0.4Ω NMOS + 0.7Ω PMOS switches - eliminates Schottky diode, improves efficiency by ~8% vs. asynchronous designs |
| Antiringing Control | Internal resistor across SW–VIN at zero-current crossing - suppresses LC ringing and reduces EMI without external components |
Applications
| Glucose Meter Power Supply | Portable Instrumentation |
|---|---|
|
Use Scenario: Single alkaline cell (1.0–1.6V) powers a glucose meter requiring stable 5V for analog front-end and microcontroller. IC Role / Device Role / Timing Role: Primary boost regulator with output disconnect - isolates sensor circuitry during standby to prevent battery drain. Use Value: 0.85V start-up and 8µA IQ extend battery life beyond 6 months; SC70-6 footprint fits tight handheld enclosures. |
Use Scenario: Dual NiMH cells (2.4–3.2V) power a handheld multimeter with LCD backlight and precision ADC. IC Role / Device Role / Timing Role: Fixed 5V rail generator - supplies clean, regulated voltage to analog signal chain and display driver. Use Value: 95% peak efficiency at 140mA load ensures minimal self-heating; output ripple ≤60mVPP with 22µF ceramic capacitor. |
| Li-Ion–Powered Digital Camera | Low-Profile Wearable Sensor Hub |
|
Use Scenario: 3.0–4.2V Li-Ion battery powers digital camera logic and flash LED driver requiring 5V. IC Role / Device Role / Timing Role: High-current boost stage - delivers 175mA at 5V from 3V input with thermal foldback protection. Use Value: 400mA peak switch current and 0.4Ω NMOS support transient flash loads; 1mm profile avoids mechanical interference. |
Use Scenario: Coin-cell–powered wearable health monitor needs 5V for BLE radio and motion sensor interface. IC Role / Device Role / Timing Role: Micropower boost converter - operates down to 0.85V input and draws <1µA in shutdown. Use Value: SC70-6 package (1.8 × 1.2 mm) enables ultra-compact PCB layout; no external diode reduces BOM count and board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3528ESC6-5#TRPBF | Higher start-up voltage (0.7V), higher peak current (1A), DFN-8 package (2×3mm) | Supports heavier loads (up to 500mA) but requires larger PCB area and lacks SC70-6 compatibility | Select when >200mA output current or lower input voltage (<0.85V) is required; not drop-in due to pinout and package mismatch |
| LTC3429ESC6-5#TRPBF | Same SC70-6 package, 600mA ISW, 500kHz fixed frequency, no output disconnect | Higher current capability but no VIN–VOUT isolation in shutdown - unsuitable where zero leakage is mandatory | Choose for higher-power applications without disconnect requirement; pin-compatible but functionally incomplete replacement |
Compared with LTC3525ISC6-5, LTC3528ESC6-5 offers greater output current at the cost of larger footprint and no output disconnect, while LTC3429ESC6-5 provides pin-compatible higher-current operation but omits critical shutdown isolation - making LTC3525ISC6-5 uniquely suited for ultra-low-power, space-constrained battery systems requiring true output disconnect.
Availability
LTC3525ISC6-5 is available at Aetrix Electronics and suitable for glucose meters, portable instrumentation, and Li-Ion–powered digital cameras requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature range (–40°C to +125°C).
Supply support for LTC3525ISC6-5 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, manufacturing, and documentation for legacy Linear parts including the LTC3525 family.
The LTC3525 product line was designed specifically for micropower, space-constrained battery-powered applications - emphasizing ultralow IQ, minimal external components, and robust start-up from near-dead cells.
FAQ
What is the minimum input voltage required for LTC3525ISC6-5 to start switching?
The LTC3525ISC6-5 guarantees startup from 0.85V input under all conditions, verified across –40°C to +125°C junction temperature. It uses an internal start-up oscillator to bootstrap operation even when VIN is below the threshold needed for normal PWM mode. Once VOUT exceeds VIN by ≥0.2V and either voltage reaches ≥1.8V, it transitions to full synchronous operation. This makes LTC3525ISC6-5 ideal for single-cell alkaline or NiMH applications where voltage drops below 1V during discharge.
Does LTC3525ISC6-5 support input voltages higher than its 5V output?
Yes, LTC3525ISC6-5 supports VIN ≥ VOUT operation (e.g., 5.5V input with 5V output), but with reduced functionality: the synchronous rectifier is disabled, resulting in lower efficiency and diminished output current capability. In this mode, the device relies on passive rectification through the PMOS body diode. Output disconnect remains active during shutdown, but regulation accuracy degrades slightly above VOUT. For optimal performance, VIN should remain below VOUT - confirmed in the LTC3525ISC6-5 datasheet's "VIN > VOUT Operation" note.
How does the output disconnect feature work in LTC3525ISC6-5?
In LTC3525ISC6-5, output disconnect is implemented via controlled gate drive of the internal 0.7Ω PMOS synchronous rectifier. When SHDN is pulled below 0.4V, the PMOS is turned off, physically isolating VOUT from VIN. This prevents inrush current at startup and eliminates reverse current flow during shutdown - ensuring <1µA total shutdown current. Unlike simple enable/disable, this is a true hardware disconnect verified across temperature and process corners, critical for battery longevity in always-on sensor nodes.
What is the recommended output capacitor for LTC3525ISC6-5 and why?
The LTC3525ISC6-5 datasheet recommends a minimum 10µF X5R/X7R ceramic capacitor at VOUT, with 22µF preferred for reduced ripple. At 5V output, 22µF lowers peak-to-peak ripple from ~60mV to ~40mV under full load (175mA) due to improved charge reservoir and lower effective series resistance. Larger values (>47µF) increase light-load peak inductor current unnecessarily, reducing efficiency. The capacitor must be placed adjacent to VOUT and GND pins per layout guidelines - confirmed in LTC3525ISC6-5 Typical Application TA06 and Component Selection section.
Is LTC3525ISC6-5 pin-compatible with other variants like LTC3525ISC6-3.3?
Yes, all LTC3525ISC6-x variants (including LTC3525ISC6-3, LTC3525ISC6-3.3, and LTC3525ISC6-5) share identical SC70-6 pinout, package dimensions, thermal characteristics, and absolute maximum ratings. Only the internal feedback network differs to set output voltage - meaning PCB layout, external components (inductor, capacitors), and control signals (SHDN, GND, VIN, SW, VOUT) are fully interchangeable. This allows voltage-scaling flexibility without redesign - validated in Linear's Order Information table and Pin Configuration diagram.
LTC3525ISC6-5 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 175mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
LTC3525ISC6-5 FAQ
1.How can I place an order for LTC3525ISC6-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3525ISC6-5 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 LTC3525ISC6-5 reliable?
The price and inventory of LTC3525ISC6-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3525ISC6-5 is usually 5 days.
3.What payment methods are accepted for LTC3525ISC6-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3525ISC6-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3525ISC6-5?
LTC3525ISC6-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3525ISC6-5 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 LTC3525ISC6-5?
For technical support, including LTC3525ISC6-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3525ISC6-5 requirements.
6.How does Aetrix verify that LTC3525ISC6-5 is sourced from the original manufacturer or authorized distributors?
All LTC3525ISC6-5 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 LTC3525ISC6-5 meets industry standards.
7.What is the process for return or replacement of LTC3525ISC6-5?
All LTC3525ISC6-5 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3525ISC6-5, 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 LTC3525ISC6-5 part is unused and in its original packaging.
Return procedure for LTC3525ISC6-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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