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Analog Devices Inc. LTC3529EDCB#TRPBF
- Part No.:
- LTC3529EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3529EDCB#TRPBF.pdf
- Description:
- IC REG BOOST 5V 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,480
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Product details
Overview
LTC3529EDCB#TRPBF from Analog Devices (formerly Linear Technology) is a 5V synchronous step-up DC/DC converter optimized for USB On-The-Go (OTG) host power delivery. It delivers up to 500mA output current from a single Li-ion cell (1.8V–4.2V), features 1.5MHz fixed-frequency PWM control, internal MOSFETs with 90mΩ NMOS and 120mΩ PMOS RDS(ON), and operates in an 8-lead 2mm × 3mm DFN package.
For engineers reviewing the LTC3529EDCB#TRPBF datasheet, LTC3529EDCB#TRPBF pinout, LTC3529EDCB#TRPBF application, or LTC3529EDCB#TRPBF equivalent, this page provides verified technical context, real-world USB OTG use cases, validated alternative parts, and supply-chain support for embedded portable designs requiring robust 5V VBUS generation with fault detection and output disconnect.
Technical Context
The LTC3529EDCB#TRPBF uses current-mode PWM control with internal compensation and a 1.5MHz oscillator, enabling stable regulation across 1.8V–5.25V input and fixed 5V output. Its dual-MOSFET synchronous rectification eliminates body-diode conduction, enabling true output disconnect during shutdown.
Fault protection includes 22ms deglitched overcurrent detection on FAULT, programmable auto-restart or latchoff via RST, thermal shutdown at ~160°C, and anti-ringing circuitry that connects a 100Ω resistor between SW and VIN in discontinuous mode to suppress EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±3% (4.85V–5.15V); meets USB OTG VBUS specification without external feedback. |
| Max Output Current | 500mA at 5V from 3.6V input; supports full USB OTG host power capability. |
| Input Voltage Range | 1.8V to 5.25V; enables operation from single Li-ion (2.5V–4.2V) or two alkaline cells (1.8V–3.2V). |
| Switching Frequency | 1.5MHz (1.2–1.8MHz range); allows compact 4.7μH inductors and low-ESR ceramic capacitors. |
| Efficiency | Up to 95% at 3.6V input / 500mA load; minimizes thermal rise in space-constrained portable devices. |
| Shutdown Current | <1μA; preserves battery life during host idle states in USB OTG applications. |
| Fault Response | 22ms deglitched FAULT assertion; prevents false triggers during transient overloads. |
Pinout & Package
Package: 8-lead 2mm × 3mm × 0.75mm plastic DFN (DCB) with exposed pad (Pin 9) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 8) | Input supply connection | Accepts 1.8V–5.25V; must be decoupled with ≥3.3μF low-ESR ceramic capacitor placed adjacent to pin. |
| SW (Pin 2) | Switch node | Connects to inductor; high di/dt node requiring short/wide trace and anti-ringing control to minimize EMI. |
| VOUT (Pin 1) | Regulated 5V output & sense | Drain of internal PMOS rectifier; requires short/wide trace to output capacitor to maintain regulation and stability. |
| PGND (Pin 4) | Power ground return | High-current path for inductor and MOSFETs; must connect directly to exposed pad and ground plane. |
| FAULT (Pin 5) | Open-drain fault flag | Pulls low after 22ms overcurrent; used by host MCU to detect short-circuit or overload on VBUS line. |
| RST (Pin 7) | Fault recovery mode select | High = auto-restart every 22ms; Low = latchoff until SHDN toggle or VIN cycle - critical for system-level fault containment. |
| SHDN (Pin 3) | Active-low enable | Logic threshold: <0.35V = shutdown (<1μA IQ); >1V = active; supports voltage levels above VIN/VOUT. |
| SNSGND (Pin 6) | Sense ground reference | Must tie directly to PGND at single point near IC; separates current-sense reference from noisy power ground. |
Key Features
| Feature | Design Value |
|---|---|
| USB OTG–specific fault detection | 22ms deglitched FAULT output enables reliable VBUS overload detection per USB OTG spec, avoiding nuisance shutdowns. |
| True output disconnect | Eliminates PMOS body diode conduction during shutdown, ensuring VOUT drops to 0V and zero reverse current from input source. |
| Integrated soft-start | 2ms controlled ramp of current limit prevents inrush surge; automatically reinitiated after fault recovery or enable. |
| Anti-ringing control | Internal 100Ω switch between SW and VIN in DCM reduces high-frequency ringing, lowering radiated EMI without external components. |
| Thermal shutdown with hysteresis | Shuts down at ~160°C junction temperature; restarts automatically after ~10°C cooldown, protecting against sustained overloads. |
Applications
| USB OTG Host Power Supply | Digital Camera VBUS Generator |
|---|---|
Use Scenario: Portable smartphone or tablet acting as USB host for peripherals (keyboard, flash drive, sensor). IC Role / Device Role / Timing Role: Primary 5V VBUS power source with fault monitoring and automatic recovery. Use Value: Delivers 500mA compliant 5V output from single-cell Li-ion while asserting FAULT to MCU upon cable short, enabling safe peripheral enumeration. |
Use Scenario: Digital camera providing power to USB-connected GPS module or storage device. IC Role / Device Role / Timing Role: Compact, efficient boost converter supplying regulated 5V to external USB accessories. Use Value: Enables USB OTG functionality without compromising battery runtime, leveraging 95% peak efficiency and <1μA shutdown current. |
| Personal Media Player Charging Hub | Smartphone Accessory Dock |
Use Scenario: Portable media player powering USB headphones or DAC via dock interface. IC Role / Device Role / Timing Role: Synchronous boost regulator with output disconnect to isolate VBUS when not in host mode. Use Value: Prevents backfeed into battery during accessory disconnect; RST pin allows configurable fault response for robust field operation. |
Use Scenario: Smartphone dock providing 5V power to connected USB-C hub or display adapter. IC Role / Device Role / Timing Role: High-frequency (1.5MHz) step-up converter enabling small 4.7μH inductor and 10μF ceramic output cap. Use Value: Fits within tight 2mm × 3mm footprint while maintaining USB-compliant ripple and transient response for plug-and-play reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3528EDE#TRPBF | 1A max output, 1MHz switching, same 2mm × 3mm DFN but 10-pin; lacks FAULT deglitch timer and RST-configurable recovery. | Higher current capability but no USB OTG–specific fault signaling; suited for general 5V boost where fault diagnostics are handled externally. | Select LTC3528EDE#TRPBF only if >500mA load or lower switching frequency is required; not drop-in for USB OTG compliance. |
| LTC3422EDE#TRPBF | 1.5A max output, 3MHz switching, 3mm × 3mm DFN-10; includes output disconnect but no integrated FAULT timer or deglitch logic. | Targeted at higher-power portable systems; requires external logic for 22ms fault timing and recovery mode selection. | Choose LTC3422EDE#TRPBF for 3MHz operation and higher current, but expect added design complexity for USB OTG fault handling. |
Compared with LTC3529EDCB#TRPBF, LTC3528EDE#TRPBF offers higher current at lower frequency but omits USB OTG–specific fault management, while LTC3422EDE#TRPBF delivers greater power density at 3MHz yet requires external circuitry to replicate the integrated 22ms deglitched FAULT and RST-selectable recovery behavior.
Availability
LTC3529EDCB#TRPBF is available at Aetrix Electronics and suitable for USB On-The-Go host power supplies, portable digital cameras, and personal media players requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3529EDCB#TRPBF 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 product lines with full datasheet, simulation model, and application support.
The LTC3529EDCB#TRPBF belongs to Linear's USB-optimized power conversion family, designed specifically for compact, high-efficiency 5V VBUS generation in battery-powered OTG hosts with integrated fault safety.
FAQ
What is the minimum input voltage supported by the LTC3529EDCB#TRPBF?
The LTC3529EDCB#TRPBF supports an input voltage range from 1.8V to 5.25V. This allows reliable operation from a single Li-ion cell across its full discharge curve (2.5V–4.2V) or two alkaline cells (1.8V–3.2V), making it ideal for portable USB OTG host applications where input voltage varies significantly.
Does the LTC3529EDCB#TRPBF provide true output disconnect, and how is it implemented?
Yes, the LTC3529EDCB#TRPBF provides true output disconnect by eliminating body-diode conduction of its internal P-channel MOSFET rectifier. During shutdown (SHDN low), VOUT is actively pulled to 0V with no reverse current flow from the output capacitor back into the input source - a critical feature for USB OTG compliance and system-level power isolation.
How does the FAULT pin on the LTC3529EDCB#TRPBF behave during an overcurrent event?
The FAULT pin on the LTC3529EDCB#TRPBF is an open-drain output that pulls low only after an overcurrent condition persists for ≥22ms, with built-in deglitching to prevent false triggering. Its state remains low until the fault clears and the device either auto-restarts (RST high) or is manually reset (SHDN toggle or VIN cycle), ensuring robust USB bus protection.
Can the LTC3529EDCB#TRPBF operate with a 6.8μF output capacitor, and why is this value significant?
Yes, the LTC3529EDCB#TRPBF is stable with a 6.8μF output capacitor, which complies with the USB On-The-Go specification limiting output capacitance to ≤6.5μF. A 6.8μF X5R/X7R ceramic capacitor provides optimal trade-off between low ESR, minimal voltage ripple, and USB OTG compliance - larger values (e.g., 10μF) improve transient response but exceed spec limits.
What thermal protection mechanism does the LTC3529EDCB#TRPBF include, and at what temperature does it activate?
The LTC3529EDCB#TRPBF includes thermal shutdown that activates at approximately 160°C junction temperature. When triggered, all internal switches turn off, the FAULT pin asserts low, and the device remains latched off until the die cools by ~10°C, at which point a soft-start sequence initiates automatically - protecting against sustained overload or poor PCB thermal design.
LTC3529EDCB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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):
- 1.8V
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
LTC3529EDCB#TRPBF FAQ
1.How can I place an order for LTC3529EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3529EDCB#TRPBF 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 LTC3529EDCB#TRPBF reliable?
The price and inventory of LTC3529EDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3529EDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3529EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3529EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3529EDCB#TRPBF?
LTC3529EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3529EDCB#TRPBF 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 LTC3529EDCB#TRPBF?
For technical support, including LTC3529EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3529EDCB#TRPBF requirements.
6.How does Aetrix verify that LTC3529EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3529EDCB#TRPBF 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 LTC3529EDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3529EDCB#TRPBF?
All LTC3529EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3529EDCB#TRPBF, 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 LTC3529EDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3529EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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