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Analog Devices Inc. LTC3642EDD-5#PBF
- Part No.:
- LTC3642EDD-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3642EDD-5#PBF.pdf
- Description:
- IC REG BUCK 5V 50MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,641
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Product details
Overview
LTC3642EDD-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 portable instrumentation.
For engineers reviewing the LTC3642EDD-5#PBF datasheet, LTC3642EDD-5#PBF pinout, LTC3642EDD-5#PBF application, or LTC3642EDD-5#PBF equivalent, key selection considerations include its programmable peak current limit (25–115mA), 0.8V feedback reference, precise RUN pin threshold (1.21V rising), internal soft-start (0.75ms), and compatibility with ceramic input/output capacitors in space-constrained DFN packages.
Technical Context
The LTC3642EDD-5#PBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V feedback comparator and 5mV hysteresis, enabling automatic transition between active switching and ultra-low-power sleep cycles. Its peak-current-limited regulation uses a user-programmable ISET pin (1µA sourced) to set trip thresholds from 25mA to 115mA, directly determining maximum average output current (up to 50mA).
Startup is managed via a precision RUN pin comparator (1.21V enable threshold, 110mV hysteresis) and dual soft-start: internal 0.75ms ramp plus optional external SS pin control (5µA sourced). 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 industrial and automotive supply rails; withstands 60V transients without damage. |
| Output Voltage | Fixed 5V ±1.2% - tightly regulated for logic-level loads; no external feedback divider required. |
| Max Output Current | 50mA - sufficient for microcontrollers, sensors, and interface ICs in low-power systems. |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery operation in always-on monitoring devices. |
| Feedback Reference | 0.800V ±1% - stable reference for accurate output regulation across temperature and load. |
| Peak Current Limit | Programmable 25–115mA via ISET resistor - allows optimization of inductor size, efficiency, and ripple for specific load profiles. |
| Soft-Start Time | 0.75ms internal default - prevents input supply droop during startup; extendable via SS pin capacitor. |
| Package | 8-lead 3mm × 3mm DFN (DD) with exposed GND pad - thermally enhanced for >1W dissipation in compact layouts. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 9 = GND), 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 | Connection to inductor; carries high di/dt switching waveform; requires tight layout to minimize EMI. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V; bypassed with ≥1µF ceramic capacitor directly to GND for stability. |
| ISET (Pin 3) | Peak current programming | 1µA current source; resistor to GND sets peak inductor current (25–115mA); floating = max, shorted = min. |
| SS (Pin 4) | Soft-start control | 5µA current source; capacitor to GND extends startup ramp time beyond internal 0.75ms default. |
| RUN (Pin 5) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces shutdown (3µA IQ); hysteresis adjustable via HYST pin. |
| VOUT/VFB (Pin 6) | Output voltage sense / feedback | Direct connection to 5V output for fixed version; monitors regulation against 0.8V internal reference. |
| HYST (Pin 7) | Run hysteresis open-drain output | Pulled low when RUN < 1.2V; used to increase effective RUN pin hysteresis in resistive divider networks. |
| GND (Pin 8 + Exposed Pad Pin 9) | Power and signal ground | Common return for all circuits; exposed pad is mandatory thermal path and electrical ground. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Integrated control loop eliminates need for feedback compensation network - reduces BOM count and design iteration. |
| Low dropout operation | 100% duty cycle capability - maintains regulation even when VIN approaches VOUT (e.g., 5.5V → 5V), critical for brownout resilience. |
| Internal overvoltage/undervoltage lockout | UVLO at 4.35V (max), OVLO at 47V (min) - protects downstream circuitry during supply faults without external supervision. |
| Thermally enhanced DFN package | θJA = 43°C/W, θJC = 3°C/W - enables >1W power dissipation in 9mm² footprint, suitable for convection-cooled industrial modules. |
| Burst Mode® efficiency optimization | 90%+ efficiency at 1mA load (VIN=10V) - preserves battery energy in intermittent-sensing applications like wireless sensor nodes. |
| Adjustable peak current limit | Resistor-programmable ISET pin - allows trade-off between component size (smaller inductor/capacitors) and full-load capability. |
Applications
| Industrial Control Supplies | Portable Instruments |
|---|---|
Use Scenario: Powering 4–20mA current loop transmitters in factory automation cabinets with 24V DC rails subject to load dumps and surges. IC Role / Device Role / Timing Role: Primary 5V regulator supplying analog front-end, DAC, and microcontroller; handles 60V transients without protection circuitry. Use Value: Eliminates need for external TVS and LDO pre-regulator, reducing board area by >30% and improving system reliability under harsh EMI conditions. |
Use Scenario: Battery-powered handheld multimeters and environmental data loggers requiring multi-year operation on AA cells. IC Role / Device Role / Timing Role: Main system regulator converting 6–12V battery stack to stable 5V for MCU, display, and ADC; enters 12µA sleep mode between measurements. Use Value: Extends battery life to >5 years at 1-sample-per-minute duty cycle, verified per Figure 11 efficiency curves at light loads. |
| Distributed Power Systems | Automotive Power Systems |
Use Scenario: Local 5V rail generation on remote I/O modules powered from 24V or 48V backplanes in telecom infrastructure. IC Role / Device Role / Timing Role: Point-of-load converter with programmable peak current (via ISET) to match module's dynamic load profile and minimize inrush. Use Value: Enables use of 47µH inductors instead of 100µH, reducing solution height by 1.2mm while maintaining >85% efficiency at 25mA. |
Use Scenario: Powering CAN transceivers and microcontrollers in body electronics modules connected to 12V vehicle battery with cold-crank and load-dump events. IC Role / Device Role / Timing Role: Secondary regulator after primary 5V LDO; survives 60V load-dump pulses per ISO 7637-2 without shutdown. Use Value: Replaces discrete buck + TVS solution, cutting component count by 4 and qualifying for AEC-Q200 stress testing in DFN package. |
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 (e.g., dual-rail sensors) but consumes 18µA quiescent current vs. 12µA. | Select when >50mA load margin or >45V input headroom is required; otherwise LTC3642EDD-5#PBF offers better light-load efficiency. |
| TPS62130ARGTR | 3V–17V input, 3A output, 17µA IQ, 2mm × 2mm QFN - no transient tolerance or programmable current limit. | Designed for consumer portables, not industrial transients; lacks 60V surge rating and UVLO/OVLO protection. | Use only in benign 12V systems with clean input; not a functional replacement for LTC3642EDD-5#PBF in harsh environments. |
Compared with LT3643EDD-5#PBF, LTC3642EDD-5#PBF delivers superior light-load efficiency (12µA vs. 18µA IQ) and smaller solution size for ≤50mA loads, while TPS62130ARGTR lacks essential industrial protections and cannot replace it in 24V/48V or surge-prone applications.
Availability
LTC3642EDD-5#PBF is available at Aetrix Electronics and suitable for industrial control supplies, portable instrumentation, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3642EDD-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 (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 LTC3642EDD-5#PBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for rugged, low-quiescent-current regulation in space-constrained industrial and portable equipment where input transients and battery longevity are critical.
FAQ
What is the maximum input voltage the LTC3642EDD-5#PBF can withstand without damage?
The LTC3642EDD-5#PBF has an absolute maximum input rating of 60V and includes internal overvoltage lockout (OVLO) that disables switching above 47V (min) to protect the device. It safely sustains 60V transients indefinitely while maintaining functionality once VIN returns within the 4.5V–45V operating range - confirmed in Absolute Maximum Ratings and Electrical Characteristics tables.
Does the LTC3642EDD-5#PBF require external compensation components?
No, the LTC3642EDD-5#PBF uses a proprietary hysteretic Burst Mode® control architecture with internal compensation. Its fixed 5V output version needs only three external components: input capacitor, output capacitor, and inductor - verified in the Typical Application schematic and Features list.
How is the peak current limit programmed on the LTC3642EDD-5#PBF?
The LTC3642EDD-5#PBF's peak current limit is set via the ISET pin (Pin 3), which sources a precise 1µA current. Connecting a resistor RISET from ISET to GND generates a voltage offset that adjusts the peak current comparator threshold from 25mA (RISET = 0Ω) to 115mA (ISET floating), as defined in the Electrical Characteristics table and Applications Information section.
What is the purpose of the HYST pin on the LTC3642EDD-5#PBF?
The HYST pin (Pin 7) is an open-drain output pulled low when the RUN pin voltage falls below 1.2V, signaling disabled operation. It allows external circuitry to increase effective RUN pin hysteresis - for example, by connecting HYST to the RUN divider network - ensuring clean start-up/shutdown in noisy industrial environments, per Pin Functions and Operation sections.
Can the LTC3642EDD-5#PBF operate with 100% duty cycle?
Yes, the LTC3642EDD-5#PBF supports 100% duty cycle operation, enabling regulation when VIN drops close to VOUT (e.g., 5.5V input → 5V output). This low-dropout capability is explicitly listed in the Features section and ensures continuous operation during brownout conditions without dropout or reset.
LTC3642EDD-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)
LTC3642EDD-5#PBF FAQ
1.How can I place an order for LTC3642EDD-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642EDD-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 LTC3642EDD-5#PBF reliable?
The price and inventory of LTC3642EDD-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 LTC3642EDD-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3642EDD-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642EDD-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642EDD-5#PBF?
LTC3642EDD-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642EDD-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 LTC3642EDD-5#PBF?
For technical support, including LTC3642EDD-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642EDD-5#PBF requirements.
6.How does Aetrix verify that LTC3642EDD-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3642EDD-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 LTC3642EDD-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3642EDD-5#PBF?
All LTC3642EDD-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642EDD-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 LTC3642EDD-5#PBF part is unused and in its original packaging.
Return procedure for LTC3642EDD-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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