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Analog Devices Inc. LTC3632EMS8E#PBF
- Part No.:
- LTC3632EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3632EMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 20MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,964
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Product details
Overview
LTC3632EMS8E#PBF 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#PBF datasheet, LTC3632EMS8E#PBF pinout, LTC3632EMS8E#PBF application, or LTC3632EMS8E#PBF 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#PBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V feedback comparator (5mV hysteresis), enabling ultra-low quiescent current at light loads while maintaining regulation. Its peak current limit is set via ISET pin current (1µA sourced) and external resistor, directly determining maximum average output current (≤50% of peak).
Startup is controlled by a precision RUN pin comparator (1.21V rising threshold, 110mV hysteresis) with optional HYST pin feedback for adjustable UVLO, and internal 0.75ms soft-start ramps both output voltage and peak inductor current - preventing input droop and inrush during power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports wide-range industrial and automotive inputs; survives 60V transients via overvoltage lockout. |
| Output Current | Up to 20mA - sufficient for powering sensors, microcontrollers, and analog front-ends in low-power systems. |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery life in always-on remote monitoring devices. |
| Feedback Reference | 0.8V ±1% - enables precise output voltage setting from 0.8V to VIN using two external resistors. |
| Peak Current Limit | Programmable 10mA to 50mA via ISET pin - allows optimization of inductor size, efficiency, and ripple for specific load profiles. |
| Shutdown Current | 3µA - ensures minimal leakage when disabled via RUN pin below 0.7V. |
| Package | 8-lead MSOP (MS8E) with exposed GND pad - provides low thermal resistance (θJC = 5–10°C/W) for reliable operation at 125°C junction temperature. |
Pinout & Package
The LTC3632EMS8E#PBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries pulsed current from internal high-side and low-side MOSFETs - must be routed with low-inductance layout. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–50V; requires local 1µF ceramic bypass capacitor to GND for stability and EMI suppression. |
| 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 startup. |
| RUN (Pin 5) | Enable/disable control | Logic-high >1.21V enables operation; <0.7V forces shutdown (3µA IQ); internal 110mV hysteresis prevents chatter. |
| VFB (Pin 6) | Feedback input | Compares divided output voltage to 0.8V reference; ±1% accuracy enables stable regulation across line/load/temperature. |
| HYST (Pin 7) | Open-drain hysteresis output | Pulled low when RUN is inactive; used with external resistor divider to add custom hysteresis to UVLO function. |
| GND (Pins 8 & 9) | Power and signal ground | Pin 8 is signal GND; Pin 9 is exposed thermal pad - both must connect to solid PCB ground plane for thermal integrity and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Hysteretic control eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Low dropout operation | 100% duty cycle capability - maintains regulation even when VIN approaches VOUT, critical for brownout resilience. |
| Internal overvoltage lockout | Shuts down switching above 54V (rising), protecting against 60V surges without external clamping components. |
| Adjustable RUN pin hysteresis | Combines RUN comparator and HYST open-drain output to implement precise, user-defined undervoltage lockout thresholds. |
| Thermally enhanced MS8E package | Exposed GND pad and low θJA (40°C/W) enable full 20mA output at 125°C ambient in compact footprint. |
Applications
| Industrial Control Loop Power | Portable Instrumentation Supply |
|---|---|
Use Scenario: Powering 4–20mA current loop transmitters in PLC I/O modules with wide-input industrial rails (12–48V DC). IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated field power to stable 5V or 3.3V for sensor signal conditioning and DACs. Use Value: 12µA quiescent current minimizes self-heating in sealed enclosures; 50V max input handles load-dump transients in factory automation environments. | Use Scenario: Providing regulated supply to handheld multimeters, gas detectors, or portable oscilloscopes powered by single Li-ion or dual alkaline cells. IC Role / Device Role / Timing Role: Efficient battery-to-rail conversion with programmable current limit to match sensor and display load profiles. Use Value: Burst Mode® operation extends battery life by >3× vs continuous-mode converters; 0.75ms internal soft-start prevents voltage sag during wake-up events. |
| Automotive Subsystem Regulation | Distributed Low-Power Node Supply |
Use Scenario: Generating clean 3.3V for CAN transceivers, LIN controllers, or EEPROMs in body electronics modules (e.g., door control units). IC Role / Device Role / Timing Role: Secondary regulator downstream of main 12V rail, rejecting battery ripple and cold-crank dips. Use Value: Wide 4.5V–50V input range accommodates 12V/24V architectures and 60V load-dump survival; precise RUN threshold enables controlled power sequencing. | Use Scenario: Powering wireless sensor nodes (Zigbee, BLE) in building automation or smart agriculture gateways with intermittent solar/battery sources. IC Role / Device Role / Timing Role: High-efficiency buck converter interfacing variable-energy harvesters or backup batteries to ultra-low-power MCUs. Use Value: Programmable peak current (10–50mA) allows matching inductor/capacitor selection to energy budget; low IQ preserves stored energy during long sleep intervals. |
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 |
|---|---|---|---|
| LTC3631EMS8E#PBF | Same pinout and package; lacks programmable peak current limit and HYST pin - fixed 50mA peak current, no adjustable UVLO hysteresis. | Best for fixed-load applications where simplicity outweighs tuning flexibility; not suitable for dynamic current optimization. | Select LTC3631EMS8E#PBF only if peak current adjustment and precise UVLO hysteresis are unnecessary - reduces external component count but sacrifices design adaptability. |
| MAX17535ATA+T | Higher 100mA output, wider 4.5V–60V input, but 25µA IQ (vs 12µA); uses current-mode PWM (not Burst Mode®), requiring compensation. | Better for higher-current distributed supplies; less suited for battery longevity-critical applications due to higher IQ and no ultra-low-power sleep mode. | Choose MAX17535ATA+T when >20mA output or 60V absolute max input is required - accept trade-off of higher quiescent current and added compensation complexity. |
Compared with LTC3631EMS8E#PBF, the LTC3632EMS8E#PBF adds programmable current limiting and adjustable hysteresis for tighter system-level power control; versus MAX17535ATA+T, it delivers superior light-load efficiency and simpler layout at the cost of lower output current and narrower input surge tolerance.
Availability
LTC3632EMS8E#PBF is available at Aetrix Electronics and suitable for industrial control supplies, portable instrumentation, and automotive subsystems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3632EMS8E#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3632EMS8E#PBF belongs to ADI's high-voltage monolithic DC/DC converter product line, designed specifically for space-constrained, low-power industrial and instrumentation applications demanding ultra-low quiescent current and robust input transient protection.
FAQ
What is the maximum input voltage the LTC3632EMS8E#PBF can withstand without damage?
The LTC3632EMS8E#PBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout that disables switching above 54V (rising). This allows the device to safely sustain 60V transients - such as automotive load-dump events - without external protection circuitry, while maintaining regulation between 4.5V and 50V.
How does the ISET pin on the LTC3632EMS8E#PBF adjust output current capability?
The ISET pin on the LTC3632EMS8E#PBF sources a precise 1µA current; connecting a resistor from ISET to GND generates a voltage that offsets the internal peak current comparator. This sets the peak inductor current between 10mA (R = 0Ω) and 50mA (floating), directly determining maximum average output current (≤50% of peak) and enabling optimization of efficiency and component size for the LTC3632EMS8E#PBF's target load.
Can the LTC3632EMS8E#PBF operate with 100% duty cycle, and why does that matter?
Yes, the LTC3632EMS8E#PBF supports 100% duty cycle operation, allowing VOUT to remain regulated even when VIN drops close to the output voltage. This low-dropout behavior is critical in brownout conditions - for example, during automotive cranking or battery discharge - ensuring uninterrupted power to sensitive downstream circuitry without requiring a separate LDO post-regulator.
What is the purpose of the HYST pin on the LTC3632EMS8E#PBF, and how is it used?
The HYST pin on the LTC3632EMS8E#PBF is an open-drain logic output pulled low when the RUN pin comparator is inactive (i.e., RUN < 1.2V). It is used with an external resistor divider to add programmable hysteresis to the RUN pin's undervoltage lockout function - enabling precise, application-specific turn-on/turn-off thresholds without additional comparators or discrete logic.
Does the LTC3632EMS8E#PBF require external compensation components?
No, the LTC3632EMS8E#PBF uses a hysteretic Burst Mode® control architecture with internal feedback compensation - eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces bill-of-materials count, and improves reliability by removing tuning-sensitive passive components from the LTC3632EMS8E#PBF's feedback path.
LTC3632EMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3632EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3632EMS8E#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 LTC3632EMS8E#PBF reliable?
The price and inventory of LTC3632EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3632EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC3632EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3632EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3632EMS8E#PBF?
LTC3632EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3632EMS8E#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 LTC3632EMS8E#PBF?
For technical support, including LTC3632EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3632EMS8E#PBF requirements.
6.How does Aetrix verify that LTC3632EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3632EMS8E#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 LTC3632EMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LTC3632EMS8E#PBF?
All LTC3632EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3632EMS8E#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 LTC3632EMS8E#PBF part is unused and in its original packaging.
Return procedure for LTC3632EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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