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Analog Devices Inc. LTC3642IDD#TRPBF
- Part No.:
- LTC3642IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3642IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 50MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,635
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Product details
Overview
LTC3642IDD#TRPBF 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 from a 4.5V–45V input. It operates in Burst Mode® with 12µA no-load quiescent current, features programmable peak current limit (25–115mA), and maintains regulation during 60V input transients - ideal for industrial control supplies and battery-operated instrumentation.
For engineers reviewing the LTC3642IDD#TRPBF datasheet, LTC3642IDD#TRPBF pinout, LTC3642IDD#TRPBF application, or LTC3642IDD#TRPBF equivalent, key selection criteria include its wide-input ruggedness, ultra-low IQ operation, internal soft-start and RUN threshold control, and compatibility with compact 3mm × 3mm DFN packaging for space-constrained embedded power rails.
Technical Context
The LTC3642IDD#TRPBF 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 comparator is programmable via ISET pin current (1µA source) and resistor-to-GND, directly setting inductor ramp limits from 25mA to 115mA.
Startup is managed by a precise RUN pin comparator (1.21V rising threshold, 110mV hysteresis) and dual soft-start capability - internal 0.75ms ramp plus external SS pin control (5µA sourced current). The device integrates overvoltage lockout (47–52V trip), undervoltage lockout (3.75–4.5V), and reverse-current protection, all within a single monolithic IC requiring only three external components for fixed-output configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and automotive inputs; tolerates 60V transients without damage. |
| Output Current | Up to 50mA - maximum average load current derived from 115mA peak inductor current (IOUT ≈ 0.5 × IPEAK). |
| Quiescent Current | 12µA typical at no load - enables multi-year battery life in always-on portable instruments and sensor nodes. |
| Feedback Reference | 0.800V ±8mV - precision reference enabling accurate output regulation across temperature and line variations. |
| Peak Current Limit | Programmable 25mA to 115mA via ISET pin - allows optimization of inductor size, ripple, and efficiency for specific load profiles. |
| Soft-Start Time | 0.75ms internal default; adjustable via SS pin capacitor - prevents input droop and inrush during cold start in distributed systems. |
| Package | 8-lead 3mm × 3mm DFN 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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection to inductor; ties drains of internal P-channel high-side and N-channel low-side MOSFETs. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; bypassed with ceramic capacitor to GND for stable switching operation. |
| ISET (Pin 3) | Peak current programming | 1µA current source sets peak inductor current threshold (25–115mA) via resistor to GND. |
| SS (Pin 4) | Soft-start control | 5µA current source charges external capacitor to control output voltage ramp rate and reduce input surge. |
| RUN (Pin 5) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces shutdown (3µA IQ); hysteresis improves noise immunity. |
| VOUT/VFB (Pin 6) | Output feedback | Connects to regulated output (fixed versions) or resistive divider (adjustable versions) for 0.8V reference comparison. |
| HYST (Pin 7) | Run hysteresis logic output | Open-drain output pulled low when RUN <1.2V - used to enhance RUN pin hysteresis in divider-based monitoring circuits. |
| GND (Pin 8 & Pin 9) | Ground reference | Pins 8 and 9 (exposed pad) are internally connected - both must be soldered to PCB ground for thermal performance and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Integrated control loop eliminates need for loop compensation components - reduces BOM count and layout sensitivity. |
| Low dropout operation | 100% duty cycle capability - maintains regulation even when VIN approaches VOUT, critical for battery end-of-life operation. |
| Internal overvoltage and undervoltage protection | 47–52V OVLO and 3.75–4.5V UVLO thresholds - protects downstream circuitry without external supervision ICs. |
| Adjustable peak current limit | 25–115mA range set by single resistor - enables scalable design for 10mA sensor rails or 50mA microcontroller supplies. |
| Thermally enhanced DFN package | θJA = 43°C/W, θJC = 3°C/W - supports >1W power dissipation in 9mm² footprint for high-density industrial PCBs. |
Applications
| Industrial Control Supplies | Portable Instruments |
|---|---|
Use Scenario: Powering 4–20mA current-loop transmitters and PLC I/O modules in factory automation cabinets with unregulated 24V DC rails. IC Role / Device Role / Timing Role: Primary step-down regulator converting noisy 24V–48V field bus to clean, stable 3.3V or 5V for analog front-ends and microcontrollers. Use Value: 60V transient tolerance and 12µA quiescent current ensure uninterrupted operation during motor switching noise and extended maintenance intervals. |
Use Scenario: Supplying handheld multimeters, gas detectors, and portable oscilloscopes powered by two AA/AAA cells or Li-ion batteries. IC Role / Device Role / Timing Role: Main system regulator managing battery voltage decay from 3.0V to 4.2V while delivering 50mA to mixed-signal SoCs and displays. Use Value: Burst Mode® efficiency >85% at 100µA load extends battery life beyond 500 hours; low-profile DFN fits slim enclosures. |
| Distributed Power Systems | Automotive Power Systems |
Use Scenario: Local point-of-load conversion in telecom base stations and network routers where 48V backplane feeds multiple isolated subsystems. IC Role / Device Role / Timing Role: Non-isolated buck converter generating auxiliary 3.3V rails for FPGAs, PHYs, and clock buffers from intermediate 12V or 24V distribution voltages. Use Value: Wide 4.5V–45V input range accommodates varying intermediate bus voltages; only three external parts simplify board-level design. |
Use Scenario: Powering infotainment head units, ADAS camera modules, and body control modules in 12V vehicle electrical systems subject to load-dump transients. IC Role / Device Role / Timing Role: Robust pre-regulator stepping down battery voltage to 5V/3.3V before LDOs, handling ISO 7637-2 pulse 5a (60V/100ms) without shutdown. Use Value: Integrated 60V surge tolerance eliminates need for external TVS diodes; precise RUN threshold ensures reliable cold-cranking startup below 6V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage, low-IQ step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3643EDD#TRPBF | Higher 100mA output, wider 3.5V–60V input, but 25µA IQ and larger MSOP-10 package. | Better suited for higher-current loads (>60mA) and extreme input surges beyond 60V. | Select LT3643EDD#TRPBF if load exceeds 50mA or input may exceed 45V regularly. |
| TPS62130ARGTR | Lower 3–17V input, 3A output, 17µA IQ, but lacks 60V surge tolerance and programmable peak current. | Optimized for cost-sensitive consumer electronics with stable mid-range inputs. | Choose TPS62130ARGTR only for benign 12V systems where ruggedness and ultra-low IQ are secondary. |
Compared with LT3643EDD#TRPBF and TPS62130ARGTR, the LTC3642IDD#TRPBF uniquely balances 50mA capability, 12µA IQ, 60V surge resilience, and 3mm × 3mm DFN size - making it optimal for space-constrained, battery-backed, or industrial-grade 4.5V–45V point-of-load designs where reliability and efficiency at light loads are critical.
Availability
LTC3642IDD#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, portable instruments, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3642IDD#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, 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 LTC3642IDD#TRPBF belongs to Linear's high-voltage monolithic DC/DC converter product line, designed specifically for rugged, low-quiescent-current power conversion in harsh environments where input transients, wide voltage ranges, and long battery life are essential.
FAQ
What is the maximum input voltage the LTC3642IDD#TRPBF can withstand without damage?
The LTC3642IDD#TRPBF has an absolute maximum input rating of 60V and includes internal overvoltage lockout (OVLO) that disables switching above 47–52V. This allows the device to survive automotive load-dump transients and industrial power surges while maintaining safe operation - provided the 60V limit is not exceeded. Continuous operation is specified from 4.5V to 45V.
Does the LTC3642IDD#TRPBF require external compensation components?
No, the LTC3642IDD#TRPBF uses a proprietary hysteretic Burst Mode® control architecture that requires no external compensation components. Its internal loop is fully self-contained, eliminating the need for feedback capacitors or resistors - reducing bill-of-materials count and simplifying layout for fixed-output applications.
How is the output voltage set on the LTC3642IDD#TRPBF?
The LTC3642IDD#TRPBF is offered in fixed-output versions (e.g., -3.3, -5) and adjustable variants. For fixed versions, connect VOUT/VFB (Pin 6) directly to the output. For adjustable operation, use a resistive divider from VOUT to GND with the junction tied to VOUT/VFB - setting VOUT = 0.8V × (1 + R1/R2). The LTC3642IDD#TRPBF itself does not include R1/R2; those are external.
What is the purpose of the HYST pin on the LTC3642IDD#TRPBF?
The HYST pin (Pin 7) is an open-drain logic output pulled low when the RUN pin voltage falls below 1.2V. It provides a direct indication of enable/disable state and can be used with external resistors to increase effective hysteresis on the RUN pin - improving noise immunity in high-EMI environments where the RUN signal is derived from a resistive divider across VIN.
Can the LTC3642IDD#TRPBF operate with 100% duty cycle?
Yes, the LTC3642IDD#TRPBF supports 100% duty cycle operation, allowing it to maintain regulation even when the input voltage drops close to the output voltage - such as in battery-powered systems nearing end-of-life. This feature ensures continuous power delivery without dropout, unlike many buck controllers that require minimum VIN–VOUT differential.
LTC3642IDD#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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 45V
- 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#TRPBF FAQ
1.How can I place an order for LTC3642IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642IDD#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 LTC3642IDD#TRPBF reliable?
The price and inventory of LTC3642IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3642IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3642IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642IDD#TRPBF?
LTC3642IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642IDD#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 LTC3642IDD#TRPBF?
For technical support, including LTC3642IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3642IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3642IDD#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 LTC3642IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3642IDD#TRPBF?
All LTC3642IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642IDD#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 LTC3642IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3642IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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