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Analog Devices Inc. LTC3639IMSE#TRPBF
- Part No.:
- LTC3639IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3639IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,377
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Product details
Overview
LTC3639IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input synchronous step-down DC/DC regulator with integrated high-side P-channel and low-side N-channel MOSFETs. It operates from 4V to 150V input, delivers up to 100mA output current, maintains regulation down to 0.8V output, and draws only 12µA quiescent current in Burst Mode® sleep. It is used in industrial control supplies and avionics power rails where high-voltage tolerance and ultra-low standby power are critical.
For engineers reviewing the LTC3639IMSE#TRPBF datasheet, LTC3639IMSE#TRPBF pinout, LTC3639IMSE#TRPBF application, or LTC3639IMSE#TRPBF equivalent, key selection criteria include its 150V absolute maximum input rating, programmable peak current limit (17–230mA), precise 0.8V ±1% feedback reference, internal soft-start, and thermally enhanced 16-lead MSE package with exposed GND pad.
Technical Context
The LTC3639IMSE#TRPBF employs Burst Mode® control architecture with hysteretic feedback, enabling high efficiency across load currents from 1µA to 100mA. Its dual-MOSFET synchronous topology eliminates external diode losses, while the 100% duty-cycle dropout capability supports operation near VOUT. The internal 0.8V reference and programmable VPRG pins allow fixed 1.8V/3.3V/5V or adjustable outputs without external resistors.
Control logic integrates reverse-current protection, shoot-through prevention, and precise RUN/OVLO comparators with 110mV hysteresis. Peak current is set via ISET pin using a resistor-to-GND (100kΩ yields ~100mA peak), and soft-start timing is determined by SS pin capacitance (1ms per 6.25nF). Switching frequency varies dynamically with VIN, VOUT, L, and IPEAK, typically 50–200kHz in burst cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 150V - Enables direct regulation from unregulated HV sources like PoE++, battery stacks, or industrial 48V/72V/110V rails. |
| Output Voltage Range | 0.8V to VIN - Supports both low-voltage logic rails and high-efficiency intermediate bus conversion. |
| Max Output Current | 100mA - Determined as half the programmable peak inductor current (200mA max), ensuring stable continuous conduction. |
| Quiescent Current | 12µA typical in Burst Mode® sleep - Minimizes standby power loss in always-on systems like remote sensors or safety monitors. |
| Feedback Reference | 0.800V ±1% - High-precision internal reference enables accurate output regulation with minimal external component count. |
| Peak Current Limit | Adjustable 17mA to 230mA via ISET resistor - Optimizes inductor size, output ripple, and light-load efficiency for specific load profiles. |
| Duty Cycle | Up to 100% - Maintains regulation during deep dropout (e.g., VIN = 5.5V → VOUT = 5V), critical for brownout resilience. |
| Package Thermal Resistance | θJA = 40°C/W, θJC = 10°C/W - Exposed GND pad (Pin 17) must be soldered to PCB thermal plane for rated 125°C junction operation. |
Pinout & Package
The LTC3639IMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP (MSE) package with four missing pins (12-pin variant), featuring an exposed GND pad (Pin 17) that must be soldered to the PCB ground plane for thermal performance. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection point for external inductor; ties drains of internal high-side P-MOSFET and low-side N-MOSFET. |
| VIN (3) | Main supply input | Accepts 4V–150V input; requires local ceramic bypass capacitor to GND for stability and EMI suppression. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating feedback loop status; 20µA pull-up, 70Ω pull-down for fault signaling or sequencing. |
| VPRG1/VPRG2 (6,7) | Output voltage programming | Select fixed 1.8V/3.3V/5V or adjustable mode via grounded/SS-connected combinations-no external resistors needed. |
| GND (8,16,17) | Ground reference | Pins 8 & 16 are signal GND; Pin 17 is exposed thermal pad-must be soldered to PCB GND for thermal derating compliance. |
| VFB (9) | Feedback input | Compares divided output voltage to 0.8V reference; directly connected to VOUT in fixed-output mode. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 6.25nF); internal 1ms default if floating-prevents input droop at startup. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak inductor current (17–230mA); floating = max, shorted = min; current source drops to 1µA in sleep. |
| OVLO (12) | Overvoltage lockout | Resistive divider from VIN sets disable threshold (1.21V rising); triggers soft-start reset on transient overvoltage. |
| RUN (14) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces shutdown (1.4µA IQ); hysteresis ensures clean turn-on/off. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates external Schottky diode, reducing conduction loss and board area-enables >90% efficiency at 50mA load. |
| Burst Mode® operation | Maintains 12µA no-load IQ while delivering regulated output-extends battery life in portable instruments and remote sensors. |
| Programmable peak current limit | Configurable 17–230mA via single ISET resistor-optimizes inductor size, ripple, and efficiency trade-offs per application. |
| Wide output voltage flexibility | 0.8V–VIN range with fixed 1.8V/3.3V/5V options-reduces BOM count and layout complexity in multi-rail systems. |
| Precision undervoltage/overvoltage protection | Independent RUN and OVLO comparators with 110mV hysteresis-ensures controlled start-up and graceful recovery from transients. |
| Thermally robust MSE package | Exposed GND pad and θJC = 10°C/W enable reliable 125°C operation in enclosed industrial enclosures or avionics bays. |
Applications
| Industrial Control Supplies | Avionics Power Management |
|---|---|
Use Scenario: Regulating 24V/48V fieldbus inputs to 3.3V microcontroller rails in PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary isolated DC/DC converter providing stable, low-noise bias for FPGA configuration and analog sensor front-ends. Use Value: 150V input rating withstands motor drive switching transients; 12µA quiescent current minimizes heat buildup in sealed enclosures. | Use Scenario: Generating 5V logic supply from 28V aircraft bus in flight data recorder subsystems requiring DO-160 compliance. IC Role / Device Role / Timing Role: High-reliability step-down regulator with built-in OVLO and soft-start to meet stringent avionics power sequencing requirements. Use Value: Programmable OVLO prevents false triggering during bus voltage spikes; 100% duty cycle ensures operation during 28V brownouts. |
| Medical Device Auxiliary Rails | Portable Instrument Battery Regulation |
Use Scenario: Deriving 1.8V core voltage for low-power ADCs and wireless transceivers in handheld ultrasound probes powered by Li-ion packs. IC Role / Device Role / Timing Role: Efficient intermediate regulator stepping down from 7.4V battery to precision analog rail, minimizing self-heating during imaging bursts. Use Value: Adjustable output and 0.8V reference enable tight regulation tolerance (<±1.5%) critical for medical-grade signal integrity. | Use Scenario: Powering embedded microcontrollers in battery-operated gas detectors with 10-year shelf-life requirements. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter maintaining regulated 3.3V output during decades-long storage with minimal self-discharge. Use Value: 12µA sleep current extends shelf life beyond 10 years; internal soft-start prevents inrush damage to aging electrolytic capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#TRPBF | Lower 80V max input, 150mA output, no programmable peak current, fixed 3.3V/5V only | Suitable for lower-voltage industrial buses but lacks 150V tolerance and adjustable output flexibility | Choose when input never exceeds 80V and fixed output suffices-reduces design complexity. |
| MAX5033BASA+T | 100V max input, 125mA output, no integrated low-side switch (requires external diode), higher 100µA IQ | Acceptable for cost-sensitive designs where 150V rating and ultra-low IQ are not required | Prefer only if 100V input ceiling is guaranteed and thermal budget allows higher standby loss. |
Compared with LTC3639IMSE#TRPBF, LTC3631EMSE#TRPBF offers higher output current but sacrifices 150V capability and programmability, while MAX5033BASA+T trades integration and efficiency for lower cost-neither matches the combination of ultra-wide input, ultra-low IQ, and flexible output programming unique to LTC3639IMSE#TRPBF.
Availability
LTC3639IMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power management, medical device auxiliary rails, and portable instrument battery regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3639IMSE#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 LTC3639IMSE#TRPBF belongs to ADI's Power by Linear™ high-voltage DC/DC regulator family, designed specifically for ruggedized power conversion in industrial, aerospace, and medical systems where input transients, wide voltage ranges, and ultra-low standby power are mission-critical.
FAQ
What is the maximum input voltage rating for the LTC3639IMSE#TRPBF?
The LTC3639IMSE#TRPBF has an absolute maximum input voltage rating of 150V, with operational input range specified from 4V to 150V. This enables direct regulation from high-voltage sources such as 48V/72V/110V industrial buses or PoE++ injectors without pre-regulation. The device remains safe and non-destructive at 150V even when disabled, provided RUN and OVLO thresholds are properly configured.
How does the LTC3639IMSE#TRPBF achieve 12µA quiescent current?
The LTC3639IMSE#TRPBF achieves 12µA typical quiescent current through Burst Mode® operation: during light loads, it enters a sleep cycle where internal power switches and current comparators are disabled, leaving only essential bias circuitry active. The 12µA figure applies at no load with VIN = 12V and TA = 25°C; actual current rises slightly with temperature and input voltage, remaining below 22µA over full operating range.
Can the LTC3639IMSE#TRPBF be configured for a 3.3V fixed output without external resistors?
Yes, the LTC3639IMSE#TRPBF supports 3.3V fixed output without external resistors by connecting VPRG1 to GND and VPRG2 to the SS pin. This configures internal feedback resistors to produce a precise 3.3V output with ±1.5% accuracy over temperature and line, eliminating BOM cost and layout sensitivity associated with external dividers. The same method applies for 1.8V (both VPRG pins to SS) and 5V (VPRG1 to SS, VPRG2 to GND).
What is the role of the exposed pad (Pin 17) on the LTC3639IMSE#TRPBF package?
The exposed pad (Pin 17) on the LTC3639IMSE#TRPBF is electrically and thermally connected to GND and must be soldered to the PCB ground plane. It provides the primary thermal path for heat dissipation, enabling θJC = 10°C/W performance. Omitting this connection degrades thermal resistance by >3×, risking junction temperature exceedance above 125°C under 100mA load-potentially violating reliability specifications and shortening lifetime.
How is the soft-start time programmed on the LTC3639IMSE#TRPBF?
The soft-start time on the LTC3639IMSE#TRPBF is programmed by placing a capacitor between the SS pin (Pin 10) and GND. The internal 5µA current source charges this capacitor, producing a linear ramp; the output voltage reaches regulation in 1ms per 6.25nF of capacitance. For example, a 12.5nF capacitor yields 2ms soft-start. If the SS pin is left floating, the internal 1ms soft-start activates automatically-no external components required for basic operation.
LTC3639IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 150V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 150V
- Current - Output:
- 100mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3639IMSE#TRPBF FAQ
1.How can I place an order for LTC3639IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3639IMSE#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 LTC3639IMSE#TRPBF reliable?
The price and inventory of LTC3639IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3639IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3639IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3639IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3639IMSE#TRPBF?
LTC3639IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3639IMSE#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 LTC3639IMSE#TRPBF?
For technical support, including LTC3639IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3639IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3639IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3639IMSE#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 LTC3639IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3639IMSE#TRPBF?
All LTC3639IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3639IMSE#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 LTC3639IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3639IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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