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Analog Devices Inc. LTC3632EMS8E#TRPBF
- Part No.:
- LTC3632EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3632EMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 20MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,648
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Product details
Overview
LTC3632EMS8E#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, synchronous step-down DC/DC converter IC with integrated high-side and low-side MOSFETs, delivering up to 20mA output current, operating from 4.5V to 50V input, and drawing only 12µA quiescent current in Burst Mode® operation - ideal for industrial control supplies and battery-operated instrumentation.
For engineers reviewing the LTC3632EMS8E#TRPBF datasheet, LTC3632EMS8E#TRPBF pinout, LTC3632EMS8E#TRPBF application, or LTC3632EMS8E#TRPBF equivalent, key selection considerations include its programmable peak current limit (10–50mA), 0.8V ±1% feedback reference, internal soft-start, precise RUN pin threshold (1.21V rising), and thermally enhanced MS8E package with exposed GND pad.
Technical Context
The LTC3632EMS8E#TRPBF employs hysteretic Burst Mode® control with an internal 0.8V reference and 5mV feedback hysteresis, enabling high efficiency across load currents from 100µA to 20mA. Its peak-current-limited architecture uses a user-programmable ISET pin (1µA sourced) to set trip thresholds between 10mA and 50mA.
Start-up is managed via internal 0.75ms soft-start and configurable external SS pin ramping; shutdown is triggered below 0.7V on RUN, with 110mV hysteresis and HYST pin open-drain logic output for UVLO extension. Input protection includes undervoltage lockout (4.35V min) and overvoltage lockout (57V min), sustaining surges up to 60V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports wide-range industrial and automotive power rails without external pre-regulation. |
| Output Current | Up to 20mA - sufficient for powering sensors, ADCs, isolated gate drivers, or 4–20mA loop transmitters. |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery life in always-on remote monitoring systems. |
| Feedback Reference | 0.8V ±1% - enables precise output voltage setting from 0.8V to VIN using two external resistors. |
| Peak Current Limit | Programmable 10–50mA via ISET resistor - allows optimization of inductor size, ripple, and efficiency for specific load profiles. |
| Overvoltage Protection | Lockout at 57V min - safeguards against 60V transient surges common in 48V industrial and telecom systems. |
| Package | MS8E (8-lead MSOP, 3mm × 3mm, 0.75mm height) with exposed GND pad - provides low thermal resistance (θJC = 5–10°C/W) for reliable operation at full load. |
Pinout & Package
The LTC3632EMS8E#TRPBF is housed in a thermally enhanced 8-lead MSOP (MS8E) package with exposed GND pad (Pin 9), requiring PCB soldering for optimal thermal and electrical performance. Pin pitch is 0.65mm; maximum height is 0.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries pulsed high-side/low-side switching current - requires low-inductance layout and Kelvin connection to GND. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–50V; must be bypassed with ceramic capacitor directly to GND (Pin 8/9) to suppress switching noise. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak inductor current (10–50mA); floating = 50mA, shorted = 10mA. |
| SS (Pin 4) | Soft-start control | Sources 5.5µA; capacitor to GND extends ramp time beyond internal 0.75ms - prevents input droop during start-up. |
| RUN (Pin 5) | Enable/disable control | Active-high logic: >1.21V enables regulation; <0.7V forces shutdown (3µA IQ); 110mV hysteresis ensures clean transition. |
| VFB (Pin 6) | Feedback input | Compares divided output voltage to 0.8V reference; ±10nA leakage enables high-resistor-divider designs (e.g., 1MΩ/160kΩ for 5V). |
| HYST (Pin 7) | Run hysteresis output | Open-drain logic output pulled low when RUN < 0.7V - used with external resistor divider to add adjustable UVLO hysteresis. |
| GND (Pins 8 & 9) | Power and signal ground | Pins 8 (lead) and 9 (exposed pad) are internally connected - pad must be soldered to large PCB GND plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains >75% efficiency down to 100µA load while holding IQ at 12µA - eliminates need for external enable sequencing in ultra-low-power systems. |
| No compensation required | Internally compensated hysteretic control loop - reduces BOM count by eliminating external compensation network and associated stability analysis. |
| Low dropout 100% duty cycle | Supports VOUT ≈ VIN operation - enables regulation in brownout conditions where input drops near output voltage. |
| Integrated power switches | Monolithic P-channel high-side and N-channel low-side MOSFETs (RON = 5Ω / 2.5Ω) - eliminates external FETs, drivers, and associated layout complexity. |
| Precise RUN threshold with hysteresis | 1.21V rising / 1.10V falling threshold + HYST pin - enables robust, noise-immune power sequencing and programmable input UVLO without external comparators. |
Applications
| Industrial Control Supplies | 4–20mA Current Loops |
|---|---|
Use Scenario: Powering analog sensor transmitters and PLC I/O modules in factory automation systems with 24V or 48V backplanes. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting unregulated field bus voltage to stable 3.3V or 5V for op-amps, ADCs, and microcontrollers. Use Value: 50V input rating and 60V surge tolerance ensure uninterrupted operation during motor switching transients and lightning-induced spikes on long cable runs. | Use Scenario: Generating precise bias for 4–20mA loop-powered transmitters in hazardous area instrumentation (e.g., pressure, temperature sensors). IC Role / Device Role / Timing Role: Low-noise, low-IQ supply for current-sense amplifier and DAC circuitry - maintains loop accuracy while minimizing headroom consumption. Use Value: 12µA quiescent current enables compliance with loop power budget (<4mA total) while supporting active diagnostics and digital communication (HART). |
| Portable Instruments | Automotive Power Systems |
Use Scenario: Battery-powered handheld test equipment (multimeters, data loggers) requiring long runtime and stable analog supply rails. IC Role / Device Role / Timing Role: Main system regulator stepping down Li-ion (3.0–4.2V) or dual-cell alkaline (2.4–3.2V) to 3.3V for MCU and precision analog front-end. Use Value: Wide input range and 100% duty cycle allow full battery utilization; programmable peak current minimizes inductor size for compact form factor. | Use Scenario: Powering infotainment peripherals, CAN transceivers, or body electronics from 12V vehicle battery with cold-crank (4.5V) and load-dump (60V) resilience. IC Role / Device Role / Timing Role: Secondary regulator providing clean 5V or 3.3V from main 12V rail - replaces discrete LDO+pre-regulator solutions. Use Value: Integrated OVP/UVP, low IQ, and thermally robust MS8E package eliminate need for external TVS and heat sinks in space-constrained junction boxes. |
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 |
|---|---|---|---|
| LT3692EMS8E#TRPBF | Higher 500mA output, fixed 3.3V/5V options, no ISET programmability, 2.5µA IQ - larger die, different pinout. | Targets higher-power loads (e.g., microcontrollers, displays); not suitable for <50mA space-constrained designs. | Select LT3692EMS8E#TRPBF only if >100mA output and fixed-VOUT are required; LTC3632EMS8E#TRPBF remains optimal for sub-20mA precision regulation. |
| TPS62125DSGR | Lower 3.6V max input, 300mA output, 3.5µA IQ, 2.5V–5.5V VOUT range - lacks OVP, UVLO, and high-voltage capability. | Designed for single-cell Li-ion or USB-powered devices; cannot replace LTC3632EMS8E#TRPBF in 24V/48V industrial environments. | TPS62125DSGR is viable only in low-input-voltage, high-efficiency portable apps; LTC3632EMS8E#TRPBF is irreplaceable where 4.5–50V operation and surge resilience are mandatory. |
Compared with LT3692EMS8E#TRPBF and TPS62125DSGR, the LTC3632EMS8E#TRPBF uniquely balances ultra-low quiescent current (12µA), 50V input rating, programmable current limiting, and compact MS8E packaging - making it the sole fit for space- and power-constrained industrial sensing nodes requiring robustness across harsh voltage transients.
Availability
LTC3632EMS8E#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loops, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3632EMS8E#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3632EMS8E#TRPBF belongs to ADI's Power by Linear™ family of high-voltage DC/DC converters, engineered specifically for reliability-critical industrial, automotive, and instrumentation applications demanding wide input range, low quiescent current, and integrated protection.
FAQ
What is the absolute maximum input voltage rating for the LTC3632EMS8E#TRPBF?
The LTC3632EMS8E#TRPBF has an absolute maximum VIN rating of 60V, with overvoltage lockout (OVLO) activating at 57V minimum to protect internal circuitry. This allows safe operation during 48V system load-dump events without external TVS diodes. The device sustains 60V continuously in shutdown mode, and resumes regulation once VIN returns within 4.5V–50V.
How does the ISET pin on the LTC3632EMS8E#TRPBF program peak inductor current?
The LTC3632EMS8E#TRPBF ISET pin sources a precise 1µA current; connecting a resistor from ISET to GND generates a voltage that offsets the internal peak current comparator. A 500kΩ resistor sets ~25mA peak current, while floating ISET yields 50mA and shorting to GND yields 10mA. This direct programming eliminates external current-sense resistors and enables optimization of inductor size and efficiency for each application.
Can the LTC3632EMS8E#TRPBF operate with 100% duty cycle, and what is its practical significance?
Yes, the LTC3632EMS8E#TRPBF supports true 100% duty cycle operation, allowing VOUT to track closely to VIN (down to VOUT ≈ VIN – dropout). This is critical in brownout scenarios - for example, when a 24V industrial rail dips to 5.2V and a 5V output must remain regulated. Unlike PWM regulators requiring minimum off-time, this feature ensures continuous regulation without dropout or reset events.
What is the role of the HYST pin on the LTC3632EMS8E#TRPBF, and how is it used in practice?
The HYST pin on the LTC3632EMS8E#TRPBF is an open-drain output pulled low when the RUN pin voltage falls below 0.7V. It is used to extend the RUN pin's hysteresis - for example, by connecting HYST to the top of a VIN-to-GND resistor divider - enabling precise, adjustable undervoltage lockout (UVLO) with custom hysteresis independent of the internal 110mV threshold. This avoids external comparators in power sequencing circuits.
Does the LTC3632EMS8E#TRPBF require external compensation components, and why?
No, the LTC3632EMS8E#TRPBF does not require external compensation components. Its hysteretic Burst Mode® control architecture is inherently stable and internally compensated. This eliminates the need for external Type-II or Type-III compensation networks, reducing component count, board area, and design validation effort - especially valuable in cost-sensitive and space-constrained industrial modules.
LTC3632EMS8E#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3632EMS8E#TRPBF FAQ
1.How can I place an order for LTC3632EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3632EMS8E#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 LTC3632EMS8E#TRPBF reliable?
The price and inventory of LTC3632EMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3632EMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3632EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3632EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3632EMS8E#TRPBF?
LTC3632EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3632EMS8E#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 LTC3632EMS8E#TRPBF?
For technical support, including LTC3632EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3632EMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3632EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3632EMS8E#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 LTC3632EMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3632EMS8E#TRPBF?
All LTC3632EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3632EMS8E#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 LTC3632EMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LTC3632EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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