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Analog Devices Inc. LTC3632IMS8E#TRPBF
- Part No.:
- LTC3632IMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3632IMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 20MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:976
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Product details
Overview
LTC3632IMS8E#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 maintaining regulation with only 12µA quiescent current in Burst Mode® operation - ideal for industrial control supplies and battery-operated instrumentation.
For engineers reviewing the LTC3632IMS8E#TRPBF datasheet, LTC3632IMS8E#TRPBF pinout, LTC3632IMS8E#TRPBF application, or LTC3632IMS8E#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 LTC3632IMS8E#TRPBF employs hysteretic Burst Mode® control with an internal 0.8V reference and 5mV feedback hysteresis, enabling ultra-low quiescent current (12µA) at no load while sustaining regulation. Its peak-current-limited architecture uses a user-programmable ISET pin (1µA current source) to set trip thresholds from 10mA to 50mA.
Startup is managed by a precision RUN 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 current source). Input protection includes UVLO (4.15V rising) and OVLO (56V rising), with safe 60V surge tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports wide-range industrial and automotive power rails without pre-regulation. |
| Output Current | Up to 20mA - sufficient for powering sensors, ADCs, isolated gate drivers, or 4–20mA loop circuitry. |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery life in always-on remote monitoring systems. |
| Feedback Reference | 0.8V ±1% - enables accurate output voltage setting from 0.8V to VIN using standard resistor dividers. |
| Peak Current Limit | Programmable 10–50mA via ISET pin - allows optimization of inductor size, efficiency, and ripple for specific load profiles. |
| Overvoltage Lockout | 56V rising threshold - protects against transients up to 60V absolute max, critical in 24V/48V industrial bus environments. |
| RUN Pin Threshold | 1.21V rising / 1.10V falling - provides precise, hysteresis-controlled enable/disable for system-level power sequencing. |
Pinout & Package
The LTC3632IMS8E#TRPBF is housed in an 8-lead plastic MSOP (MS8E) package with exposed GND pad (Pin 9), optimized for thermal dissipation in space-constrained industrial PCBs. The package measures 3mm × 3mm × 0.85mm and requires soldering of the exposed pad to PCB ground for electrical integrity and thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection to inductor; carries pulsed high-side/low-side switching current - must be routed with minimal loop area for EMI control. |
| VIN (Pin 2) | Main Power Input | Accepts 4.5V–50V supply; requires local 1µF ceramic bypass to GND (Pin 8/9) for stability and transient response. |
| 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; external capacitor to GND extends startup ramp beyond internal 0.75ms default. |
| RUN (Pin 5) | Enable/Shutdown Control | Logic-level input: >1.21V enables regulation; <0.7V disables (3µA shutdown current); hysteresis improves noise immunity. |
| VFB (Pin 6) | Feedback Input | Compares divided output voltage to 0.8V reference; connects to resistive divider (R1/R2) for output programming. |
| HYST (Pin 7) | Open-Drain Hysteresis Output | Pulled low when RUN is inactive; used with external resistor network to increase effective RUN hysteresis. |
| GND (Pins 8 & 9) | Power and Signal Ground | Pins 8 (lead) and 9 (exposed pad) are internally connected - pad must be soldered to solid PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains regulation at light loads with 12µA IQ - eliminates need for external disable circuitry in standby modes. |
| No External Compensation Required | Internally compensated hysteretic control - reduces BOM count and design iteration time for fixed-output or adjustable designs. |
| 100% Duty Cycle Low-Dropout Mode | Supports VOUT ≈ VIN - enables efficient operation near input rail collapse, e.g., during brownout or battery depletion. |
| Integrated Power Switches | Internal P-channel high-side and N-channel low-side MOSFETs - eliminates external FETs and gate drivers, reducing footprint and layout complexity. |
| Robust Input Protection | UVLO (4.15V) + OVLO (56V) + 60V surge tolerance - ensures reliable operation in noisy 24V/48V industrial power environments. |
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 DC distribution buses. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting unregulated 24V–48V bus to stable 3.3V/5V for signal conditioning and microcontroller logic. Use Value: 12µA quiescent current minimizes standby power draw across hundreds of nodes; 50V input rating withstands bus transients per IEC 61000-4-5. | Use Scenario: Generating precise bias for 4–20mA loop-powered field instruments (e.g., pressure transmitters) where loop compliance voltage is limited. IC Role / Device Role / Timing Role: High-efficiency, low-noise step-down converter supplying regulated voltage to op-amps and DACs within the loop transmitter. Use Value: Programmable peak current (10–50mA) allows matching inductor selection to loop compliance margin; 0.8V reference enables accurate current-setting resistor ratios. |
| Portable Instruments | Automotive Power Systems |
Use Scenario: Battery-powered handheld test equipment requiring long runtime and stable analog front-end supply under varying load conditions. IC Role / Device Role / Timing Role: Main DC/DC regulator for mixed-signal subsystems (ADCs, references, microcontrollers), operating from single Li-ion or dual alkaline cells. Use Value: Burst Mode® efficiency >85% at 1mA load extends battery life; wide 4.5V–50V input accommodates both battery and USB-C PD adapter inputs. | Use Scenario: Powering infotainment peripherals or body electronics in 12V vehicle architectures subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3V/5V from main 12V rail, surviving ISO 7637-2 pulses up to 60V. Use Value: Integrated OVLO and 60V surge tolerance eliminate need for external TVS; MS8E package supports compact placement near ECU connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631IMS8E#TRPBF | Lower 3.6V–42V input range; 100mA output; no programmable peak current limit. | Higher output current but less flexible for ultra-low-power or high-input-voltage use cases. | Select when >20mA load current is required and input stays below 42V. |
| TPS62130ARGTR | 3V–17V input; 3A output; 17µA IQ; requires external compensation. | Not suitable for >17V inputs or 50V surge environments; higher current capability irrelevant for 20mA applications. | Consider only for low-voltage, high-current applications where LTC3632IMS8E#TRPBF's HV capability is unnecessary. |
Compared with LTC3631IMS8E#TRPBF and TPS62130ARGTR, the LTC3632IMS8E#TRPBF uniquely balances ultra-low IQ (12µA), 50V input capability, and programmable current limiting - making it optimal for space-constrained, high-reliability industrial and instrumentation designs where input voltage range and standby efficiency are primary constraints.
Availability
LTC3632IMS8E#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loops, portable instruments, and automotive power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3632IMS8E#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. (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 LTC3632IMS8E#TRPBF belongs to Linear's high-voltage monolithic DC/DC converter product line, designed specifically for reliable, low-quiescent-power regulation in harsh industrial and instrumentation environments where wide input range and robust protection are mandatory.
FAQ
What is the maximum input voltage the LTC3632IMS8E#TRPBF can safely withstand?
The LTC3632IMS8E#TRPBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout (OVLO) that disables switching above 56V (rising). This allows the device to survive transient surges up to 60V without damage while maintaining regulation between 4.5V and 50V - critical for industrial 24V/48V bus applications compliant with IEC 61000-4-5.
How does the LTC3632IMS8E#TRPBF achieve ultra-low quiescent current?
The LTC3632IMS8E#TRPBF achieves 12µA typical quiescent current through Burst Mode® operation: during light loads, it enters sleep cycles where internal power switches and comparators are disabled, drawing only bias current. Regulation is maintained by periodic burst cycles that recharge the output capacitor - a technique especially effective for battery-powered instrumentation and always-on remote sensors.
Can the LTC3632IMS8E#TRPBF be used in 4–20mA current loop transmitter designs?
Yes, the LTC3632IMS8E#TRPBF is well-suited for 4–20mA loop transmitters. Its 4.5V–50V input range accommodates loop compliance voltages, programmable peak current (10–50mA) enables optimized inductor sizing, and 0.8V ±1% feedback reference ensures accurate current-setting resistor ratios. Its low 12µA IQ also preserves loop headroom in low-current states.
What is the purpose of the HYST pin on the LTC3632IMS8E#TRPBF?
The HYST pin on the LTC3632IMS8E#TRPBF is an open-drain output pulled low when the RUN pin voltage falls below 1.10V (falling threshold). It enables external hysteresis enhancement for the RUN comparator - for example, by connecting a resistor from HYST to RUN - allowing precise, adjustable undervoltage lockout on the VIN rail without additional components.
Does the LTC3632IMS8E#TRPBF require external compensation components?
No, the LTC3632IMS8E#TRPBF does not require external compensation components. Its hysteretic control architecture is internally compensated, eliminating the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces bill-of-materials cost, and improves reliability - particularly valuable in compact industrial and portable instrument layouts.
LTC3632IMS8E#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
LTC3632IMS8E#TRPBF FAQ
1.How can I place an order for LTC3632IMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3632IMS8E#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 LTC3632IMS8E#TRPBF reliable?
The price and inventory of LTC3632IMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3632IMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3632IMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3632IMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3632IMS8E#TRPBF?
LTC3632IMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3632IMS8E#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 LTC3632IMS8E#TRPBF?
For technical support, including LTC3632IMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3632IMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3632IMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3632IMS8E#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 LTC3632IMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3632IMS8E#TRPBF?
All LTC3632IMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3632IMS8E#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 LTC3632IMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LTC3632IMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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