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Analog Devices Inc. LTC3642IDD-5#PBF
- Part No.:
- LTC3642IDD-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3642IDD-5#PBF.pdf
- Description:
- IC REG BUCK 5V 50MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:209
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Product details
Overview
LTC3642IDD-5#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, synchronous step-down DC/DC converter with integrated high-side and low-side MOSFETs, delivering up to 50mA output current at a fixed 5V output. It operates from 4.5V to 45V input, tolerates 60V transients, and draws only 12µA quiescent current in Burst Mode® operation-enabling long battery life in industrial sensors and 4–20mA loop-powered devices.
For engineers reviewing the LTC3642IDD-5#PBF datasheet, LTC3642IDD-5#PBF pinout, LTC3642IDD-5#PBF application, or LTC3642IDD-5#PBF equivalent, key selection considerations include its 5V fixed output, programmable peak current limit (25–115mA), internal soft-start, precise RUN pin threshold (1.21V rising), and thermally enhanced 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3642IDD-5#PBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V feedback reference and 5mV comparator hysteresis, enabling automatic transition between active switching and ultra-low-power sleep cycles. Its peak-current-limited regulation uses a user-programmable ISET pin to set trip thresholds from 25mA to 115mA, directly determining maximum average output current (up to 50mA).
Startup is controlled by a precision RUN pin comparator (1.21V enable threshold, 110mV hysteresis) and dual soft-start: internal 0.75ms ramp plus optional external capacitor on SS pin. The device integrates both power switches (3.0Ω top, 1.5Ω bottom), eliminating external FETs and compensation components while supporting 100% duty-cycle low-dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial supplies and automotive batteries; withstands 60V transients without damage. |
| Output Voltage | Fixed 5V ±1.2% - tightly regulated for microcontroller I/O, analog sensors, and logic interfaces without external resistors. |
| Max Output Current | 50mA - sufficient for low-power IoT nodes, isolated gate drivers, and sensor signal conditioning circuits. |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year operation from coin cells or energy-harvesting sources. |
| Feedback Reference | 0.800V ±1% - stable reference enables accurate output regulation across temperature and line variations. |
| Peak Current Limit | Programmable 25–115mA via ISET resistor - allows optimization of inductor size, efficiency, and transient response for specific load profiles. |
| Package | 8-lead 3mm × 3mm DFN with exposed GND pad - provides low thermal resistance (θJC = 3°C/W) for reliable operation in compact enclosures. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed GND pad (Pin 9), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching waveform - requires short, low-inductance PCB trace and local ceramic decoupling. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V; requires ≥1µF ceramic bypass capacitor to GND for EMI suppression and stability. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak current limit (25–115mA); floating = max, shorted = min. |
| SS (Pin 4) | Soft-start control | Sources 5µA; external capacitor to GND extends startup ramp beyond internal 0.75ms default. |
| RUN (Pin 5) | Enable/disable control | Active-high logic: >1.21V enables operation; <0.7V shuts down to 3µA; hysteresis improves noise immunity. |
| VOUT/VFB (Pin 6) | Output voltage sense / feedback | Direct connection to 5V output for fixed-version regulation; no external divider required. |
| HYST (Pin 7) | Run hysteresis open-drain output | Pulled low when RUN < 1.2V; can drive external resistor to increase RUN pin hysteresis. |
| GND (Pin 8 & Pin 9) | Power and signal ground | Pins 8 and 9 (exposed pad) are internally connected - pad must be soldered to solid ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Integrated control loop eliminates need for feedback compensation network - reduces BOM count and layout sensitivity. |
| Low dropout operation | 100% duty cycle capability - maintains regulation even when VIN drops to VOUT + diode drop, critical for brownout resilience. |
| Internal overvoltage protection | 60V surge tolerance with automatic shutdown - protects downstream circuitry in automotive and industrial environments with load dump events. |
| Precise undervoltage lockout | 4.35V (max) UVLO rising threshold - prevents erratic startup during weak battery or unregulated supply conditions. |
| Thermally enhanced DFN | θJC = 3°C/W - enables full 50mA output in ambient temperatures up to 85°C without heatsinking. |
Applications
| Industrial 4–20mA Loop Power | Portable Instrumentation Supply |
|---|---|
Use Scenario: Powers analog front-end and microcontroller in loop-powered field transmitters operating from 12–45V loop supply. IC Role / Device Role / Timing Role: Primary 5V regulator supplying sensor interface, ADC, and low-power MCU; handles wide input variation and transient surges. Use Value: 12µA quiescent current ensures compliance with 4mA minimum loop current; 60V surge tolerance meets IEC 61000-4-5 Level 4 requirements. |
Use Scenario: Provides stable 5V rail for handheld multimeters, gas detectors, and portable data loggers powered by single Li-ion or alkaline cells. IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling extended runtime from 3.6V–45V input sources including boost-derived rails. Use Value: Burst Mode® operation delivers >85% efficiency at 1mA load - doubling battery life versus linear regulators in intermittent-sampling applications. |
| Automotive Body Control Module | Distributed Low-Power Subsystem |
Use Scenario: Supplies 5V to CAN transceivers, door lock actuators, and interior lighting controllers in 12V vehicle systems. IC Role / Device Role / Timing Role: Input-supply regulator tolerant of cold-crank (4.5V) and load-dump (60V) conditions per ISO 7637-2. Use Value: Integrated UVLO/OVLO eliminates need for external protection ICs; 125°C rating supports under-hood placement. |
Use Scenario: Powers isolated RS-485 nodes, remote I/O modules, and smart valve positioners in factory automation networks. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V industrial bus to clean 5V for digital logic and communication PHYs. Use Value: Only three external components required (inductor, input/output caps) - simplifies certification for Class I Div 2 hazardous locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3643EDD-5#PBF | Higher 100mA output, wider 3.5V–60V input, same DFN package and pinout. | Supports higher-current loads like dual-rail op-amps or larger microcontrollers; adds external sync capability. | Select when >50mA output or >45V input headroom is required; pin-compatible upgrade path. |
| TPS62130ARGTR | 3V–17V input, 3A output, 2.5MHz fixed-frequency PWM; QFN-16 package. | Optimized for high-current, low-voltage applications (e.g., FPGA core rails); lacks 60V surge tolerance and ultra-low IQ. | Choose for cost-sensitive, high-efficiency 3.3V/5V systems with stable low-voltage inputs - not suitable for industrial transients. |
Compared with LT3643EDD-5#PBF, LTC3642IDD-5#PBF offers lower quiescent current (12µA vs 25µA) and smaller solution size but reduced output capability; versus TPS62130ARGTR, it trades higher frequency and current for ruggedness, ultra-low IQ, and simplified design in harsh environments.
Availability
LTC3642IDD-5#PBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loops, and battery-operated instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3642IDD-5#PBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3642 belongs to Linear's high-voltage monolithic DC/DC converter product line, designed specifically for rugged, low-quiescent-current regulation in space-constrained industrial and automotive applications where reliability under voltage transients is critical.
FAQ
What is the maximum input voltage the LTC3642IDD-5#PBF can safely withstand?
The LTC3642IDD-5#PBF has an absolute maximum input voltage rating of 60V and includes internal overvoltage lockout that disables switching above 47–50V. This allows the device to survive automotive load-dump transients and industrial power surges without external protection components, while maintaining regulation across its normal 4.5V–45V operating range.
Does the LTC3642IDD-5#PBF require external compensation components?
No, the LTC3642IDD-5#PBF does not require external compensation components. Its hysteretic Burst Mode® control architecture is internally compensated, enabling stable operation with only three external components: an inductor, input capacitor, and output capacitor. This simplifies design, reduces BOM cost, and improves layout robustness compared to voltage-mode or current-mode controllers.
How is the output voltage set on the LTC3642IDD-5#PBF?
The LTC3642IDD-5#PBF is a fixed-output variant with a factory-trimmed 5V regulation. Pin 6 (VOUT/VFB) connects directly to the output node - no external resistor divider is needed. The internal 0.800V reference and feedback comparator maintain output accuracy within ±1.2% over temperature and line, eliminating adjustment complexity and drift concerns.
Can the LTC3642IDD-5#PBF operate with 100% duty cycle?
Yes, the LTC3642IDD-5#PBF supports 100% duty cycle operation, allowing it to maintain regulation even when the input voltage drops close to the 5V output level. This low-dropout capability is essential for brownout resilience in battery-powered or unregulated industrial supplies, ensuring continuous operation down to VIN = 5.05V (typical) before undervoltage lockout engages.
What thermal performance can be expected from the LTC3642IDD-5#PBF in a standard PCB layout?
In a standard 4-layer PCB with 2oz copper and the exposed GND pad fully soldered to an internal ground plane, the LTC3642IDD-5#PBF achieves θJA ≈ 43°C/W. At 50mA output and 12V input, power dissipation is ~180mW, resulting in ~8°C junction-to-ambient rise - well within the –40°C to 125°C operating range. Thermal derating is minimal up to 85°C ambient.
LTC3642IDD-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3642IDD-5#PBF FAQ
1.How can I place an order for LTC3642IDD-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642IDD-5#PBF 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 LTC3642IDD-5#PBF reliable?
The price and inventory of LTC3642IDD-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3642IDD-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3642IDD-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642IDD-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642IDD-5#PBF?
LTC3642IDD-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642IDD-5#PBF 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 LTC3642IDD-5#PBF?
For technical support, including LTC3642IDD-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642IDD-5#PBF requirements.
6.How does Aetrix verify that LTC3642IDD-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3642IDD-5#PBF 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 LTC3642IDD-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3642IDD-5#PBF?
All LTC3642IDD-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642IDD-5#PBF, 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 LTC3642IDD-5#PBF part is unused and in its original packaging.
Return procedure for LTC3642IDD-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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