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Analog Devices Inc. LTC3529EDCB#TRMPBF
- Part No.:
- LTC3529EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3529EDCB#TRMPBF.pdf
- Description:
- IC REG BOOST 5V 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,780
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Product details
Overview
LTC3529EDCB#TRMPBF 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 from a single Li-ion cell (1.8V–4.2V), features 1.5MHz fixed-frequency PWM control, internal compensation, and operates in current-mode with true output disconnect. Its primary circuit role is VBUS power generation in portable OTG hosts.
For engineers reviewing the LTC3529EDCB#TRMPBF datasheet, LTC3529EDCB#TRMPBF pinout, LTC3529EDCB#TRMPBF application, or LTC3529EDCB#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency vs. load curves, real-world fault behavior (22ms deglitching), and precise DFN-8 package implementation details - all critical for USB OTG compliance and battery-powered system integration.
Technical Context
The LTC3529EDCB#TRMPBF uses fixed-frequency current-mode PWM control with an internal 1.5MHz oscillator, enabling stable line/load regulation without external compensation. Its dual-MOSFET synchronous rectification includes NMOS (0.09Ω RDS(ON)) and PMOS (0.12Ω RDS(ON)) switches, supporting peak switch current limiting at 1.5A and zero-current detection to disable the rectifier below ~20mA.
It integrates USB OTG-specific logic: open-drain FAULT output with 22ms overcurrent deglitching, RST-configurable auto-restart or latchoff behavior, and true output disconnect that eliminates body-diode conduction - ensuring VOUT drops to 0V during shutdown and prevents reverse current draw from the input source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.5% (4.85–5.15V); meets USB OTG VBUS specification without external feedback resistors. |
| Input Voltage Range | 1.8V to 5.25V; supports single Li-ion (2.5–4.2V), two alkaline (1.8–3.2V), or partially discharged batteries. |
| Switching Frequency | 1.5MHz (1.2–1.8MHz range); enables use of small 4.7μH inductors and reduces EMI filtering burden. |
| Peak Switch Current Limit | 1.5A (min); ensures robust short-circuit protection while sustaining 500mA continuous output at 5V. |
| Shutdown Quiescent Current | <1μA (0.01–1μA typical); preserves battery life during host idle states in portable devices. |
| Efficiency | Up to 95% at 3.6VIN/500mAOUT; achieved via low-RDS(ON) MOSFETs and anti-ringing circuitry. |
| Fault Response | 22ms deglitched FAULT assertion; RST pin selects auto-restart (22ms timeout) or latchoff mode after overcurrent. |
Pinout & Package
Package: 8-lead 2mm × 3mm × 0.75mm plastic DFN (DCB) with exposed thermal pad (Pin 9, GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 8) | Input supply connection | Accepts 1.8–5.25V; must be decoupled with 3.3μF ceramic capacitor placed adjacent to pin. |
| SW (Pin 2) | Switch node | Connects to inductor; internal 100Ω anti-ringing switch engages when current falls to zero or SHDN is active. |
| VOUT (Pin 1) | Regulated 5V output & synchronous rectifier drain | Provides output voltage sense; internal PMOS rectifier body diode is blocked for true output disconnect. |
| PGND (Pin 4) | High-current power ground | Carries inductor return current; must connect directly to exposed pad and low-impedance ground plane. |
| FAULT (Pin 5) | Open-drain fault indicator | Pulls low for >22ms during overcurrent; requires external pull-up for microcontroller interrupt detection. |
| RST (Pin 7) | Fault recovery mode select | High = auto-restart every 22ms; Low = latchoff until SHDN toggle or VIN cycle. |
| SHDN (Pin 3) | Active-low enable control | Logic high (>1V) enables converter; logic low (<0.35V) disables with <1μA quiescent current. |
| SNSGND (Pin 6) | Sense ground reference | Must be connected to system ground; separates current-sense path from noisy power ground. |
Key Features
| Feature | Design Value |
|---|---|
| USB OTG-compliant VBUS generation | Fixed 5V output with 22ms deglitched FAULT flag and RST-selectable fault recovery - satisfies OTG host power requirements. |
| True output disconnect | Eliminates PMOS body diode conduction during shutdown, preventing reverse current and enabling zero-VOUT state. |
| Integrated soft-start | 2ms internal ramp limits inrush current at turn-on, protecting input source and reducing stress on output capacitors. |
| Anti-ringing control | Internal 100Ω switch between SW and VIN dampens resonant ringing in discontinuous conduction mode, lowering EMI. |
| Thermal shutdown protection | Activates at ~160°C junction temperature; FAULT asserts and all switches disable; resumes operation after ~10°C cooldown. |
Applications
| USB OTG Host Power Supply | Li-ion Powered Portable Media Player |
|---|---|
Use Scenario: Providing regulated 5V VBUS power from a single-cell Li-ion battery to enable USB peripheral enumeration in smartphones or tablets. IC Role / Device Role / Timing Role: Primary VBUS DC/DC converter with fault monitoring and automatic recovery logic. Use Value: Delivers 500mA at 95% efficiency from 2.5–4.2V input; true output disconnect prevents battery drain when USB is unconnected. |
Use Scenario: Powering USB peripherals (e.g., flash drives, keyboards) from a handheld media player with limited battery capacity. IC Role / Device Role / Timing Role: Synchronous boost regulator with integrated soft-start and inrush limiting. Use Value: 2ms soft-start avoids input voltage sag; <1μA shutdown current extends standby time between host sessions. |
| Digital Camera USB Interface | Smartphone OTG Accessory Hub |
Use Scenario: Enabling USB data transfer and charging support in compact digital cameras using alkaline or Li-ion cells. IC Role / Device Role / Timing Role: Fixed-frequency 1.5MHz boost converter with output disconnect and fault signaling. Use Value: Small 2mm × 3mm DFN footprint fits tight camera PCB layouts; 4.7μH inductor minimizes board area. |
Use Scenario: Supporting multi-peripheral OTG hubs in smartphones where reliability under short-circuit conditions is critical. IC Role / Device Role / Timing Role: Fault-tolerant VBUS generator with configurable latchoff/auto-restart via RST pin. Use Value: 22ms deglitched FAULT prevents false triggers during transient loads; latchoff mode recommended for repeated short scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3528EDCB#TRMPBF | 1A peak current limit, 1MHz switching frequency, same 2mm × 3mm DFN package but no FAULT pin or RST-controlled fault recovery. | Lacks USB OTG-specific fault signaling and auto-restart/latchoff configuration; suited for general-purpose 5V boost where fault handling is managed externally. | Select LTC3529EDCB#TRMPBF when USB OTG compliance, integrated fault flag, or programmable fault response is required. |
| LTC3422EDD#TRMPBF | 1.5A peak current, 3MHz switching, 3mm × 3mm DFN-10 package with output disconnect; higher frequency allows smaller inductors but adds two pins and layout complexity. | Higher switching frequency improves transient response but increases gate drive losses; no built-in 22ms deglitching - requires external timing circuitry for OTG fault detection. | Choose LTC3529EDCB#TRMPBF for drop-in USB OTG designs needing minimal external components and guaranteed 22ms fault timing. |
Compared with LTC3528EDCB#TRMPBF and LTC3422EDD#TRMPBF, the LTC3529EDCB#TRMPBF uniquely combines USB OTG-specific fault logic, true output disconnect, and 1.5MHz operation in an 8-pin 2mm × 3mm DFN - delivering optimal balance of integration, compliance, and board space for portable host applications.
Availability
LTC3529EDCB#TRMPBF is available at Aetrix Electronics and suitable for USB OTG host power supplies, portable media players, and digital camera interfaces requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LTC3529EDCB#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 its precision analog and power management product lines. Linear Technology was founded to deliver high-performance, application-optimized ICs with exceptional reliability.
The LTC3529EDCB#TRMPBF belongs to Linear's USB-compliant power conversion family, designed specifically for portable host devices requiring regulated 5V VBUS generation with integrated fault protection and minimal external components.
FAQ
What is the minimum input voltage supported by the LTC3529EDCB#TRMPBF?
The LTC3529EDCB#TRMPBF supports an input voltage range of 1.8V to 5.25V. This enables reliable operation from a single Li-ion cell (2.5V–4.2V) or two alkaline cells (1.8V–3.2V), even under deep discharge conditions. The 1.8V minimum ensures functionality down to end-of-life battery voltages without requiring pre-regulation.
How does the LTC3529EDCB#TRMPBF implement true output disconnect?
The LTC3529EDCB#TRMPBF achieves true output disconnect by actively blocking conduction through the internal PMOS synchronous rectifier's body diode during shutdown. Unlike basic boost converters, this prevents reverse current flow from VOUT to VIN, allowing VOUT to fall to 0V and eliminating standby battery drain - a critical requirement for USB OTG host power management.
What is the purpose of the RST pin on the LTC3529EDCB#TRMPBF?
The RST pin on the LTC3529EDCB#TRMPBF configures fault recovery behavior: logic high enables auto-restart mode (attempting restart every 22ms after fault shutdown), while logic low selects latchoff mode (requiring manual intervention via SHDN toggle or VIN cycle). This dual-mode capability supports both robustness in harsh environments and automatic recovery in consumer-grade OTG applications.
Can the LTC3529EDCB#TRMPBF operate efficiently at light loads?
Yes, the LTC3529EDCB#TRMPBF maintains high efficiency at light loads through pulse-skipping operation in fixed-frequency PWM mode and zero-current detection that disables the synchronous rectifier when inductor current falls below ~20mA. Combined with anti-ringing control, this minimizes switching and conduction losses, preserving battery life during intermittent USB peripheral usage.
What package type and thermal considerations apply to the LTC3529EDCB#TRMPBF?
The LTC3529EDCB#TRMPBF uses an 8-lead 2mm × 3mm × 0.75mm plastic DFN (DCB) package with an exposed thermal pad (Pin 9, GND). For optimal thermal performance, the exposed pad must be soldered to a PCB ground plane using multiple vias. Thermal resistance θJA is 64°C/W; junction temperature must remain below 125°C maximum for reliable operation.
LTC3529EDCB#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3529EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3529EDCB#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 LTC3529EDCB#TRMPBF reliable?
The price and inventory of LTC3529EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3529EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3529EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3529EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3529EDCB#TRMPBF?
LTC3529EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3529EDCB#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 LTC3529EDCB#TRMPBF?
For technical support, including LTC3529EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3529EDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC3529EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3529EDCB#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 LTC3529EDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3529EDCB#TRMPBF?
All LTC3529EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3529EDCB#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 LTC3529EDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3529EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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