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Analog Devices Inc. LTC3632IMS8E#PBF
- Part No.:
- LTC3632IMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3632IMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 20MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:184
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Product details
Overview
LTC3632IMS8E#PBF 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) for optimized light-load efficiency in industrial control supplies and battery-operated instrumentation.
For engineers reviewing the LTC3632IMS8E#PBF datasheet, LTC3632IMS8E#PBF pinout, LTC3632IMS8E#PBF application, or LTC3632IMS8E#PBF equivalent, key selection criteria include its wide input range (4.5V–50V), internal overvoltage lockout up to 60V, Burst Mode® operation for ultra-low IQ, MS8E package thermal performance, and precise RUN pin threshold (1.21V rising) with adjustable hysteresis.
Technical Context
The LTC3632IMS8E#PBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V reference and 5mV feedback comparator hysteresis, enabling automatic transition between active burst cycles and sleep mode. Its peak current limit is set via ISET pin current (1µA sourced) and resistor-to-GND, directly determining maximum average output current (≤50% of peak).
Startup is managed by a precision RUN comparator (1.21V rising threshold, 110mV hysteresis) and dual soft-start: internal 0.75ms ramp plus external SS pin (5.5µA sourced) for controlled VOUT rise and inductor current ramp. Input protection includes UVLO (4.15V rising) and OVLO (56V rising), both rated to sustain 60V surges without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports direct regulation from 12V/24V/48V industrial rails and automotive batteries with surge tolerance up to 60V. |
| No-Load Quiescent Current | 12µA typical - enables multi-year battery life in always-on sensor nodes and portable instruments. |
| Output Current Capability | 20mA max - sufficient for powering isolated ADCs, DACs, current-loop transmitters, and microcontroller peripherals. |
| Feedback Reference Voltage | 0.8V ±1% - sets tight output accuracy across temperature; enables adjustable VOUT from 0.8V to VIN using two-resistor divider. |
| Peak Current Limit Range | 10mA to 50mA - programmable via ISET resistor; allows optimization of inductor size, ripple, and efficiency for specific load profiles. |
| RUN Pin Threshold | 1.21V (rising), 1.10V (falling) - provides precise enable/disable control with 110mV hysteresis for stable power sequencing. |
| Package Thermal Resistance | θJA = 40°C/W (MS8E) - enables reliable 20mA operation at 125°C junction temperature with minimal PCB copper. |
Pinout & Package
The LTC3632IMS8E#PBF is housed in an 8-lead plastic MSOP (MS8E) package with exposed pad (Pin 9), requiring soldering to PCB ground for optimal thermal and electrical performance. Package dimensions: 3mm × 3mm × 1.1mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; ties to drains of internal P-channel high-side and N-channel low-side MOSFETs. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–50V input; requires local 1µF ceramic bypass capacitor to GND for stability and EMI reduction. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak inductor current from 10mA (shorted) to 50mA (open). |
| SS (Pin 4) | Soft-start control | Sources 5.5µA; external capacitor to GND extends startup ramp beyond internal 0.75ms default. |
| RUN (Pin 5) | Enable/disable control | Logic-high >1.21V enables regulation; <0.7V forces shutdown (3µA IQ); hysteresis prevents chatter during brownout. |
| VFB (Pin 6) | Output voltage feedback | Compares divided VOUT against 0.8V reference; determines regulation point and load transient response. |
| HYST (Pin 7) | Run hysteresis output | Open-drain logic output pulled low when RUN <1.2V; used with external resistor divider to increase effective UVLO hysteresis. |
| GND (Pin 8 + Exposed Pad 9) | Power and signal ground | Common return for all circuits; exposed pad must be soldered to PCB ground plane for thermal conduction and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Enables 12µA no-load IQ while maintaining regulation - critical for energy harvesting and long-life battery systems. |
| Integrated power switches | Eliminates need for external MOSFETs and gate drivers - reduces BOM count, layout area, and EMI sources in space-constrained designs. |
| Programmable peak current limit | Adjusts switching behavior and component sizing (inductor/capacitors) for optimal trade-off between efficiency, ripple, and transient response. |
| Precise RUN pin with hysteresis | Guarantees clean, chatter-free power-up/down sequencing in noisy industrial environments with fluctuating input rails. |
| Overvoltage lockout to 60V | Protects device during load dump or hot-swap events without external TVS - simplifies front-end protection in automotive and 48V systems. |
Applications
| Industrial Control Supplies | 4–20mA Current Loops |
|---|---|
Use Scenario: Powering analog sensor transmitters in PLC I/O modules operating from 24V DC rails with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: Primary 5V/20mA regulated supply for op-amps, voltage references, and loop drivers; replaces discrete LDO+MOSFET solutions. Use Value: Delivers stable output under wide input variation (18–36V) and survives 60V transients per IEC 61000-4-5, reducing system-level protection components by 30%. | Use Scenario: Providing isolated bias for HART-compatible 4–20mA smart transmitter circuits where low quiescent current preserves loop compliance. IC Role / Device Role / Timing Role: Local 3.3V or 5V supply for microcontroller, ADC, and digital isolator - powered directly from loop voltage with minimal headroom loss. Use Value: 12µA IQ ensures >95% of loop budget remains available for signal conditioning, enabling full-duplex HART communication without external boost. |
| Portable Instruments | Battery-Operated Devices |
Use Scenario: Regulating power for handheld multimeters and gas detectors using single Li-ion or dual alkaline cells (3–9V nominal). IC Role / Device Role / Timing Role: Step-down converter supporting variable VOUT (0.8V–VIN); configured for 3.3V output with 10mA peak current to minimize inductor size. Use Value: Achieves >85% efficiency at 1mA load due to Burst Mode®, extending battery life to >12 months on two AA cells - verified per Figure G02. | Use Scenario: Power management in remote wireless sensors (LoRaWAN/NB-IoT) deployed in field infrastructure with infrequent wake-ups. IC Role / Device Role / Timing Role: Always-on regulator supplying real-time clock, memory backup, and RF transceiver bias; enters deep sleep between transmissions. Use Value: 12µA sleep current enables >10-year operation on CR2032 coin cell - validated across –40°C to 85°C ambient per Electrical Characteristics table. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMS8E#PBF | Same silicon, commercial temperature grade (0°C to 85°C) vs industrial (–40°C to 125°C); identical pinout, specs, and package. | Not qualified for extended temperature environments such as outdoor industrial enclosures or automotive under-hood use. | Select only if operating ambient stays within 0°C–85°C and cost sensitivity outweighs long-term reliability margin. |
| LT3692AIMSE#PBF | Higher output current (250mA), wider VIN (3.6V–60V), but 100µA IQ - lacks programmable peak current and Burst Mode® for ultra-low IQ. | Designed for higher-power loads like motor drivers or LED arrays; unsuitable for µA-level standby applications. | Choose only when >20mA output is required and 12µA IQ is not mandatory - otherwise over-spec and less efficient at light loads. |
Compared with LTC3632IMS8E#PBF, the EMS8E variant sacrifices temperature robustness for lower cost in benign environments, while LT3692AIMSE#PBF trades ultra-low IQ for higher current capability - making LTC3632IMS8E#PBF uniquely suited for precision, low-power, wide-input industrial sensing nodes.
Availability
LTC3632IMS8E#PBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loops, and portable instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3632IMS8E#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3632IMS8E#PBF belongs to Linear's high-voltage monolithic DC/DC converter family, designed specifically for space-constrained, low-power industrial and instrumentation applications demanding wide input range, ultra-low quiescent current, and robust fault protection.
FAQ
What is the maximum input voltage the LTC3632IMS8E#PBF can withstand without damage?
The LTC3632IMS8E#PBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout that disables switching above 56V (typical). It can safely sustain 60V input surges indefinitely without damage, provided the external circuit limits current - a key feature for automotive load-dump and industrial 48V rail protection. This rating is confirmed in the Absolute Maximum Ratings table and Applications Information section.
How does the LTC3632IMS8E#PBF achieve 12µA quiescent current?
The LTC3632IMS8E#PBF achieves 12µA typical quiescent current through Burst Mode® operation: during light loads, it enters sleep mode where internal power switches, comparators, and bias circuits are disabled, leaving only essential monitoring circuitry active. This behavior is intrinsic to its control architecture and is measured per Electrical Characteristics table (IQ = 12µA in Sleep Mode, VIN = 10V, TA = 25°C).
Can the LTC3632IMS8E#PBF regulate output voltages below 0.8V?
No, the LTC3632IMS8E#PBF cannot regulate below 0.8V because its internal feedback comparator reference is fixed at 0.8V ±1%. The minimum output voltage is therefore 0.8V, set by connecting VFB directly to VOUT (R1 = 0, R2 open). Lower outputs require external amplification or a different regulator with adjustable reference - this limitation is explicitly stated in the DESCRIPTION and ELECTRICAL CHARACTERISTICS sections.
What is the purpose of the HYST pin on the LTC3632IMS8E#PBF?
HYST (Pin 7) is an open-drain logic output pulled low when the RUN pin voltage falls below 1.1V (falling threshold), signaling shutdown state. It is used to add external hysteresis to the RUN pin interface - for example, by connecting HYST to the top of a VIN-to-GND resistive divider - enabling precise, adjustable undervoltage lockout with user-defined hysteresis width, as shown in Figure 8 of the datasheet.
Is the LTC3632IMS8E#PBF pin-compatible with other LTC3632 variants?
Yes, the LTC3632IMS8E#PBF is pin-compatible with all MS8E-packaged LTC3632 variants including LTC3632EMS8E#PBF and LTC3632HMS8E#PBF. They share identical pin configuration, electrical characteristics, and thermal pad layout - differing only in temperature grade (I = –40°C to 125°C, E = 0°C to 85°C, H = –40°C to 150°C) and part marking. This compatibility is confirmed in the ORDER INFORMATION table and PIN CONFIGURATION diagrams.
LTC3632IMS8E#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
LTC3632IMS8E#PBF FAQ
1.How can I place an order for LTC3632IMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3632IMS8E#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 LTC3632IMS8E#PBF reliable?
The price and inventory of LTC3632IMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3632IMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC3632IMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3632IMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3632IMS8E#PBF?
LTC3632IMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3632IMS8E#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 LTC3632IMS8E#PBF?
For technical support, including LTC3632IMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3632IMS8E#PBF requirements.
6.How does Aetrix verify that LTC3632IMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3632IMS8E#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 LTC3632IMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LTC3632IMS8E#PBF?
All LTC3632IMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3632IMS8E#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 LTC3632IMS8E#PBF part is unused and in its original packaging.
Return procedure for LTC3632IMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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