My Inquiry
My Account
Analog Devices Inc. LTC3642IDD-5#TRPBF
- Part No.:
- LTC3642IDD-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3642IDD-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 50MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,407
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3642IDD-5#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 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#TRPBF datasheet, LTC3642IDD-5#TRPBF pinout, LTC3642IDD-5#TRPBF application, or LTC3642IDD-5#TRPBF equivalent, key selection criteria include its 5V fixed output, 8-pin 3mm × 3mm DFN package with exposed thermal pad, programmable peak current limit (25–115mA), precise RUN pin threshold (1.21V rising), and internal soft-start with external capacitor option.
Technical Context
The LTC3642IDD-5#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 limit is set via ISET pin biasing (1µA sourced), and RUN pin logic (1.21V enable threshold, 110mV hysteresis) supports precise power sequencing.
It integrates both P-channel high-side and N-channel low-side power switches (RON = 3.0Ω / 1.5Ω), eliminates external compensation, and supports 100% duty-cycle low-dropout operation. Input overvoltage lockout (47V rising) and undervoltage lockout (3.8V rising) provide robust protection against supply anomalies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and automotive supplies, including 24V and 36V rails. |
| Output Voltage | Fixed 5V ±1.2% - guaranteed over –40°C to 125°C junction temperature, no external resistor divider required. |
| Max Output Current | 50mA - average load capability derived from 115mA peak inductor current limit (ISET floating). |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery operation in always-on sensor nodes. |
| Feedback Reference | 0.800V ±0.8% - precision bandgap reference with 3–7mV hysteresis for stable regulation under light loads. |
| Switching Architecture | Synchronous buck with internal MOSFETs - eliminates external diode, improves efficiency at low loads, reduces BOM count. |
| Package | 8-lead 3mm × 3mm DFN with exposed GND pad - thermally enhanced (θJA = 43°C/W), requires PCB soldering of exposed pad for thermal performance. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 3mm, 0.75mm height), exposed thermal pad (Pin 9) tied to GND. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point between internal high-side and low-side MOSFETs and external inductor; carries high dv/dt switching waveform. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; requires local 1µF ceramic bypass capacitor to GND for stability and EMI suppression. |
| ISET (Pin 3) | Peak current programming | 1µA current source sets peak inductor current from 25mA (shorted) to 115mA (open); determines max output current and component sizing. |
| SS (Pin 4) | Soft-start control | 5µA current source charges external capacitor to control output voltage ramp rate; default internal soft-start is 0.75ms if floating. |
| RUN (Pin 5) | Enable/disable control | Logic input: >1.21V enables operation; <0.7V forces shutdown (3µA IQ); 110mV hysteresis prevents chatter during brownout. |
| VOUT/VFB (Pin 6) | Output feedback | Direct connection to 5V output for fixed-version regulation; senses voltage against 0.8V internal reference. |
| HYST (Pin 7) | Run hysteresis open-drain | Pulled low when RUN < 1.2V; used externally to increase RUN pin hysteresis via resistor to VIN or RUN. |
| GND (Pin 8 + Exposed Pad Pin 9) | Power and signal ground | Primary ground return path; exposed pad must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal control loop stability eliminates need for feedback compensation network-reduces design time and BOM cost. |
| Low dropout operation (100% duty cycle) | Maintains regulation even when VIN drops to VOUT level-critical for battery end-of-life operation in portable instruments. |
| Programmable peak current limit | Adjustable 25–115mA via single resistor on ISET pin-optimizes inductor/capacitor size and ripple for specific load requirements. |
| Precise RUN pin threshold with hysteresis | 1.21V enable threshold with 110mV hysteresis ensures clean, chatter-free power-up/down in noisy industrial environments. |
| 60V transient tolerance | Withstands 60V input surges without damage-meets IEC 61000-4-5 surge immunity requirements for industrial field equipment. |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Powers analog sensor front-end and DAC in loop-powered field transmitters where input is derived from 4–20mA loop voltage. IC Role / Device Role / Timing Role: Primary 5V regulator supplying sensor signal conditioning, microcontroller, and current-output stage. Use Value: 12µA quiescent current ensures minimal loop burden; 4.5V–45V input range accommodates wide loop compliance voltage (e.g., 12–40V). |
Use Scenario: Provides stable 5V rail for MEMS accelerometers, temperature sensors, and wireless SoCs in battery-operated condition monitoring nodes. IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling multi-year operation on coin-cell or Li-SOCl₂ batteries. Use Value: Burst Mode® operation maintains >85% efficiency at 100µA loads; 60V surge tolerance protects against inductive kickback in motor-control proximity zones. |
| Distributed Power System Node | Automotive Body Control Module (BCM) Sub-Rail |
Use Scenario: Generates local 5V supply from 12V/24V vehicle or factory bus in distributed I/O modules with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Compact, self-contained DC/DC converter eliminating need for external MOSFETs or compensation components. Use Value: 3mm × 3mm DFN package saves board area; internal soft-start prevents input droop during cold-cranking events. |
Use Scenario: Supplies 5V to LIN transceivers, EEPROM, and wake-up logic in BCM sub-systems requiring robustness against load-dump transients. IC Role / Device Role / Timing Role: Protected step-down regulator with UVLO (3.8V) and OVLO (47V) thresholds aligned to automotive ISO 7637-2 pulse definitions. Use Value: Tolerates 60V surges per ISO 16750-2; –40°C to 125°C operating range meets AEC-Q100 Grade 1 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | Lower IQ (300nA), but 2.7–6.5V input range; 50mA output at 5V; WSON-6 package (2mm × 2mm). | Not suitable for >6.5V inputs-cannot replace LTC3642IDD-5#TRPBF in 12V+ systems or 4–20mA loops with high compliance voltage. | Select only for ultra-low-power, low-input-voltage applications where 60V surge tolerance is unnecessary. |
| MAX17552ATC+ | 4.5–60V input, 50mA output, adjustable/fixed 5V versions; 12-lead TDFN; higher IQ (25µA) and larger footprint (3mm × 4mm). | Includes spread-spectrum and more comprehensive protection (overtemperature, short-circuit), but lacks programmable peak current limit. | Prefer when system-level EMC or fault coverage exceeds LTC3642IDD-5#TRPBF capabilities, and board area allows larger package. |
Compared with TPS62840DLCR and MAX17552ATC+, the LTC3642IDD-5#TRPBF uniquely balances 45V max input, 60V surge tolerance, 12µA IQ, and programmable current limiting in a 3mm × 3mm DFN-making it optimal for space-constrained, high-reliability industrial and automotive auxiliary rails.
Availability
LTC3642IDD-5#TRPBF is available at Aetrix Electronics and suitable for industrial sensor power supplies, 4–20mA loop transmitters, and distributed power system nodes requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3642IDD-5#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3642IDD-5#TRPBF belongs to the LTC® high-voltage monolithic DC/DC converter family, designed specifically for reliable, low-quiescent-current regulation in harsh industrial and automotive environments where wide input range and transient robustness are critical.
FAQ
What is the maximum input voltage the LTC3642IDD-5#TRPBF can withstand without damage?
The LTC3642IDD-5#TRPBF has an absolute maximum input rating of 60V and includes internal overvoltage lockout that disables switching above 47V (typical). This allows the device to survive automotive load-dump transients and industrial surge events while maintaining functional integrity-provided the 60V limit is not exceeded.
Does the LTC3642IDD-5#TRPBF require external compensation components?
No, the LTC3642IDD-5#TRPBF uses a proprietary hysteretic Burst Mode® control architecture that achieves inherent stability without external compensation networks. This eliminates the need for feedback capacitors or resistors, reducing bill-of-materials count and layout complexity compared to voltage-mode or current-mode controllers.
How is the output voltage set on the LTC3642IDD-5#TRPBF?
The LTC3642IDD-5#TRPBF is a fixed-output variant: its VOUT/VFB pin (Pin 6) connects directly to the 5V output node, referencing an internal 0.800V precision bandgap. No external resistor divider is needed-unlike the adjustable LTC3642-ADJ version-simplifying design and improving accuracy over temperature.
Can the LTC3642IDD-5#TRPBF operate with 100% duty cycle?
Yes, the LTC3642IDD-5#TRPBF supports 100% duty-cycle operation, allowing continuous conduction mode regulation even when input voltage drops to the output voltage level (e.g., VIN = 5V). This feature is essential for maintaining regulation during battery discharge or low-line conditions in portable instrumentation.
What is the purpose of the HYST pin on the LTC3642IDD-5#TRPBF?
The HYST pin (Pin 7) is an open-drain output pulled low when the RUN pin voltage falls below 1.2V. It provides external hysteresis control-e.g., by connecting a resistor from HYST to RUN-to widen the effective enable/disable threshold window, preventing oscillation during slow-rising input voltages or noisy supply conditions.
LTC3642IDD-5#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3642IDD-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3642IDD-5#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-5#TRPBF reliable?
The price and inventory of LTC3642IDD-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3642IDD-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3642IDD-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3642IDD-5#TRPBF?
LTC3642IDD-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3642IDD-5#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-5#TRPBF?
For technical support, including LTC3642IDD-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3642IDD-5#TRPBF requirements.
6.How does Aetrix verify that LTC3642IDD-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3642IDD-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3642IDD-5#TRPBF?
All LTC3642IDD-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3642IDD-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3642IDD-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3642IDD-5#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
