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Analog Devices Inc. LTC3632IDD#TRPBF
- Part No.:
- LTC3632IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3632IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 20MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,333
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Product details
Overview
LTC3632IDD#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 20mA output current from a 4.5V–50V input. It features 12µA no-load quiescent current, 0.8V ±1% feedback reference, and programmable peak current limit (10–50mA) - enabling high efficiency in battery-powered industrial sensors and 4–20mA loop supplies.
For engineers reviewing the LTC3632IDD#TRPBF datasheet, LTC3632IDD#TRPBF pinout, LTC3632IDD#TRPBF application, or LTC3632IDD#TRPBF equivalent, key selection criteria include its wide VIN range (4.5V–50V), internal overvoltage lockout (up to 60V surge), Burst Mode® operation for ultra-low IQ, and DFN-8 (3mm × 3mm) thermal performance - critical for space-constrained, high-reliability power rails.
Technical Context
The LTC3632IDD#TRPBF uses a hysteretic Burst Mode® control architecture with an internal 0.8V reference and 5mV feedback hysteresis, enabling automatic transition between active burst cycles and ultra-low-power sleep mode (12µA). Its peak current comparator is offset-programmable via ISET pin (1µA source), allowing precise tuning of inductor current limits from 10mA to 50mA.
Startup is managed by a precise RUN pin comparator (1.21V rising threshold, 110mV hysteresis) and dual soft-start: internal 0.75ms ramp plus external capacitor-based control on SS pin (5.5µA sourced). The device integrates shoot-through prevention, reverse-current detection, and 100ns minimum high-side on-time - ensuring robust operation across input transients and load steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports direct regulation from 12V/24V/48V industrial buses and automotive batteries with transient tolerance. |
| Output Current | Up to 20mA - sufficient for powering precision analog front-ends, isolated gate drivers, or 4–20mA transmitter circuitry. |
| No-Load Quiescent Current | 12µA typical - enables multi-year battery life in remote sensor nodes operating at microamp loads. |
| Feedback Reference | 0.8V ±1% - enables accurate output voltage setting from 0.8V to VIN using two external resistors. |
| Overvoltage Lockout | 54V rising / 52V falling - protects against 60V surges without external clamping components. |
| Peak Current Limit | Programmable 10–50mA via ISET resistor - allows optimization of inductor size, ripple, and efficiency for specific load profiles. |
| Package | 8-lead 3mm × 3mm DFN with exposed GND pad - provides low θJA = 43°C/W for passive thermal management in compact layouts. |
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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection to inductor and drains of internal P-channel high-side and N-channel low-side MOSFETs; carries high di/dt switching current. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–50V input; requires local 1µF ceramic bypass to GND for EMI suppression and stability. |
| ISET (Pin 3) | Peak current programming | 1µA current source sets peak inductor current (10–50mA) via resistor to GND; floating = 50mA, shorted = 10mA. |
| SS (Pin 4) | Soft-start control | 5.5µA current source charges external capacitor to control output voltage ramp rate; floating defaults to 0.75ms internal ramp. |
| RUN (Pin 5) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces shutdown (3µA IQ); hysteresis adjustable via HYST pin. |
| VFB (Pin 6) | Feedback input | Compares divided output voltage to 0.8V reference; ±1% accuracy ensures tight output regulation across line/load/temp. |
| HYST (Pin 7) | Run hysteresis open-drain output | Pulled low when RUN < 1.2V; used with external resistor divider to increase effective UVLO hysteresis on VIN. |
| GND (Pins 8 & 9) | Power and signal ground | Pins 8 (bond pad) and 9 (exposed thermal pad) are internally connected; pad must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Enables 12µA no-load IQ while maintaining regulation - extends battery life in always-on IoT sensors without sacrificing wake-up responsiveness. |
| Internal synchronous switches | Integrated P-channel high-side and N-channel low-side MOSFETs eliminate external FETs and gate drivers - reduces BOM count and layout area. |
| Programmable peak current limit | Adjusts inductor current ceiling (10–50mA) to match load requirements - permits smaller magnetics and lower ripple in low-current applications. |
| Precise RUN pin threshold | 1.21V enable threshold with 110mV hysteresis - enables clean, glitch-free power sequencing and configurable undervoltage lockout on VIN. |
| No compensation required | Fixed-frequency hysteretic control eliminates need for external compensation network - simplifies design and improves reliability across component tolerances. |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Powering a 4–20mA loop transmitter in a hazardous-area field instrument powered from a 24V loop supply with ±10% variation and 60V surge events. IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 5V or 3.3V rail for op-amps, ADCs, and current-sense circuitry - operating continuously in Burst Mode®. Use Value: 12µA quiescent current minimizes loop error; 50V max input and 60V surge protection eliminate need for external TVS; DFN package fits within tight explosion-proof housing constraints. |
Use Scenario: Providing regulated bias for MEMS accelerometers, temperature sensors, and wireless SoCs in battery-powered condition monitoring nodes deployed for >5 years. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter supplying 3.3V at ≤10mA to analog and digital subsystems - entering deep sleep between measurement intervals. Use Value: 12µA no-load IQ directly extends battery service life; programmable peak current allows use of miniature 470µH inductors; 0.8V reference enables accurate low-voltage sensing. |
| Distributed Power in PLC Backplanes | Automotive Body Control Module |
Use Scenario: Local point-of-load regulation from a 24V backplane in modular PLC I/O cards where space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Compact, thermally efficient 20mA buck converter powering isolated CAN transceivers, optocouplers, and digital I/O drivers - surviving 48V load-dump transients. Use Value: 3mm × 3mm DFN with exposed pad achieves 43°C/W θJA for passive cooling; overvoltage lockout up to 60V replaces discrete clamp circuits; no external compensation saves board area. |
Use Scenario: Regulating power for LIN bus transceivers and door module microcontrollers in 12V automotive systems subject to cold-crank (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Robust input-stage buck converter delivering 5V/20mA to safety-critical subcircuits - maintaining regulation during cranking and rejecting load-dump energy. Use Value: 4.5V–50V input range covers full automotive battery envelope; 60V surge tolerance meets ISO 7637-2 Pulse 5a; -40°C to 125°C rating matches under-hood requirements. |
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 |
|---|---|---|---|
| LT3652IMSE#TRPBF | 42V max input, 2A output, constant-current/constant-voltage battery charger architecture; higher IQ (100µA), no programmable peak current. | Designed for Li-ion charging, not general-purpose regulation; lacks Burst Mode® and 0.8V reference flexibility. | Select only if battery charging functionality is required; not drop-in for fixed-output DC/DC applications. |
| TPS63001DRCR | 2.5V–5.5V input, 0.9A output, buck-boost topology; 85µA IQ, no overvoltage protection beyond 6V absolute max. | Intended for single-cell battery systems; cannot withstand 24V/48V industrial inputs or 60V surges. | Use only in low-voltage portable applications; unsuitable for industrial or automotive VIN ranges. |
Compared with LT3652IMSE#TRPBF and TPS63001DRCR, the LTC3632IDD#TRPBF uniquely combines 50V input capability, 12µA IQ, programmable current limiting, and integrated 60V surge protection - making it the only viable choice for space-constrained, high-reliability 4–20mA and sensor power designs across harsh industrial environments.
Availability
LTC3632IDD#TRPBF is available at Aetrix Electronics and suitable for industrial sensor power supplies, 4–20mA loop transmitters, and distributed PLC power rails requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3632IDD#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 LTC3632IDD#TRPBF belongs to Linear's high-voltage monolithic DC/DC converter product line, designed specifically for reliable, low-quiescent-current regulation in industrial instrumentation, process control, and ruggedized embedded systems.
FAQ
What is the maximum input voltage the LTC3632IDD#TRPBF can safely withstand?
The LTC3632IDD#TRPBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout that disables switching above 54V (rising) to protect the device. It is rated for continuous operation from 4.5V to 50V, making it suitable for 48V industrial buses and automotive load-dump scenarios. The 60V surge tolerance eliminates need for external TVS diodes in many applications.
How does the LTC3632IDD#TRPBF achieve 12µA quiescent current?
The LTC3632IDD#TRPBF achieves 12µA typical no-load supply current through Burst Mode® operation: it enters a deep sleep state where internal power switches, comparators, and bias circuits are disabled, drawing minimal current from VIN while maintaining output regulation via the output capacitor. This mode activates automatically when load current drops below ~100µA.
Can the LTC3632IDD#TRPBF be used to generate a 3.3V output?
Yes, the LTC3632IDD#TRPBF can generate a stable 3.3V output by configuring the external feedback divider per VOUT = 0.8V × (1 + R1/R2). At 3.3V, typical efficiency exceeds 85% across 1–20mA loads with 12V or 24V input, as confirmed in Figure 2 of the datasheet. The 0.8V ±1% reference ensures tight output accuracy.
What is the purpose of the HYST pin on the LTC3632IDD#TRPBF?
The HYST pin on the LTC3632IDD#TRPBF is an open-drain logic output pulled low when the RUN pin voltage falls below 1.2V. It enables external adjustment of RUN pin hysteresis - for example, by connecting a resistor from HYST to VIN - to implement precise, user-defined undervoltage lockout thresholds on the input supply without additional ICs.
Is the LTC3632IDD#TRPBF pin-compatible with other packages in the LTC3632 family?
No, the LTC3632IDD#TRPBF (DFN-8) is not pin-compatible with the MS8E-package variants (e.g., LTC3632EMS8E#TRPBF), despite identical functionality and pin numbering. The DFN and MSOP packages have different land patterns, thermal pad configurations, and mechanical outlines - requiring separate PCB layouts. Always verify footprint against the specific package drawing.
LTC3632IDD#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 or Negative
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 50V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 50V
- Current - Output:
- 20mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3632IDD#TRPBF FAQ
1.How can I place an order for LTC3632IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3632IDD#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 LTC3632IDD#TRPBF reliable?
The price and inventory of LTC3632IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3632IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3632IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3632IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3632IDD#TRPBF?
LTC3632IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3632IDD#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 LTC3632IDD#TRPBF?
For technical support, including LTC3632IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3632IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3632IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3632IDD#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 LTC3632IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3632IDD#TRPBF?
All LTC3632IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3632IDD#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 LTC3632IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3632IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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