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Analog Devices Inc. LTC3639HMSE#PBF
- Part No.:
- LTC3639HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3639HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:208
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Product details
Overview
LTC3639HMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 150V input synchronous step-down DC/DC regulator with integrated high-side P-channel and low-side N-channel MOSFETs. It delivers up to 100mA output current, operates from 4V to 150V input, maintains regulation at 100% duty cycle, and draws only 12µA quiescent current in Burst Mode® sleep. It is used in industrial control supplies and avionics power rails where wide-input, high-voltage, low-quiescent operation is required.
For engineers reviewing the LTC3639HMSE#PBF datasheet, LTC3639HMSE#PBF pinout, LTC3639HMSE#PBF application, or LTC3639HMSE#PBF equivalent, key selection criteria include its 150V absolute max input rating, programmable 10–100mA peak current limit via ISET, 0.8V ±1% feedback reference, –40°C to 150°C operating junction temperature, and thermally enhanced 16-lead MSE package with exposed GND pad.
Technical Context
The LTC3639HMSE#PBF implements Burst Mode® control with hysteretic feedback and internal peak current limiting. Its dual-MOSFET synchronous architecture enables 100% duty-cycle dropout operation and eliminates external compensation components. The RUN and OVLO pins provide precise, independently programmable undervoltage and overvoltage lockout thresholds (1.21V rising, 1.10V falling).
It integrates a 0.8V precision bandgap reference, soft-start circuitry with internal 1ms ramp (externally adjustable via SS pin), and programmable output voltage selection (1.8V/3.3V/5V fixed or adjustable) using VPRG1/VPRG2 logic states. Peak current is set by a resistor from ISET to GND, scaling linearly from 17mA to 230mA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 150V - supports direct regulation from unregulated HV rails like PoE++, battery stacks, or industrial 48V/72V/110V systems. |
| Max Output Current | 100mA - determined as half the 230mA typical peak inductor current limit; sufficient for biasing gate drivers, sensors, or microcontrollers. |
| Quiescent Current | 12µA in Burst Mode® sleep - enables multi-year battery life in always-on remote monitoring nodes. |
| Feedback Reference | 0.800V ±1% - sets output accuracy for adjustable configurations; enables stable 1.8V/3.3V/5V outputs via internal resistor dividers. |
| Operating Temp Range | –40°C to 150°C junction - qualified for under-hood automotive, downhole tools, and avionics enclosures without derating. |
| Switch On-Resistance | Top: 4.2Ω, Bottom: 2.2Ω - defines conduction loss at light-to-moderate loads; optimized for efficiency above 10mA. |
| Soft-Start Time | 1ms internal default - prevents inrush current and input rail droop during cold start; extended externally via SS capacitor. |
Pinout & Package
The LTC3639HMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP (MSE) package with four missing pins (pins 2, 4, 13, 15), exposing a GND-connected thermal pad (Pin 17) that must be soldered to PCB ground for rated thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch Node | Connection point between internal high-side and low-side MOSFET drains; ties to inductor and catch diode (if used); requires low-inductance layout. |
| VIN (3) | Main Input Supply | Accepts 4V–150V input; bypassed with ceramic capacitor to GND; absolute max rating is 150V. |
| FBO (5) | Feedback Comparator Output | Open-drain flag indicating feedback loop status; pulled up internally at 20µA; useful for system fault monitoring. |
| VPRG1/VPRG2 (6,7) | Output Voltage Selection | Logic inputs that configure internal feedback divider for 1.8V, 3.3V, 5V, or adjustable output; tied to GND or SS pin per configuration table. |
| GND (8,16,17) | Ground Reference | Pins 8 and 16 are signal GND; Pin 17 is exposed thermal pad and must be soldered to PCB ground plane for thermal integrity. |
| VFB (9) | Feedback Input | Compares divided output voltage against 0.8V reference; directly connected to output for fixed-VOUT modes; tied to external divider for adjustable mode. |
| SS (10) | Soft-Start Control | Capacitor-to-GND sets output ramp time (1ms per 6.25nF); sourcing current drops from 50µA (startup) to 5µA (normal) to minimize ripple. |
| ISET (11) | Peak Current Set | Resistor-to-GND programs peak inductor current from 17mA to 230mA; determines max load current and influences light-load efficiency vs. ripple tradeoff. |
| OVLO (12) | Overvoltage Lockout | Resistor-divider input; disables switching when >1.21V; resets soft-start on recovery; protects against input transients above 150V. |
| RUN (14) | Enable/Undervoltage Control | Resistor-divider input; enables operation above 1.21V; shuts down to 1.4µA when <0.7V; provides precise UVLO with 110mV hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated P-channel high-side and N-channel low-side MOSFETs eliminate external diode, enabling >90% efficiency at 50mA and 100% duty-cycle dropout. |
| Burst Mode® Operation | Reduces quiescent current to 12µA at no load while maintaining tight output regulation-critical for energy-harvesting and battery-backed systems. |
| Programmable Peak Current Limit | Adjustable 10–100mA maximum output via ISET resistor; allows optimization of inductor size, output ripple, and light-load efficiency for each application. |
| Wide Output Voltage Range | 0.8V to VIN - supports fixed 1.8V/3.3V/5V outputs or fully adjustable regulation down to 0.8V with external resistive divider. |
| Precision Thresholds & Hysteresis | RUN and OVLO comparators feature 1.21V rising / 1.10V falling thresholds with 110mV hysteresis-enabling robust, noise-immune input voltage supervision. |
Applications
| Industrial Control Supplies | Avionics Power Rails |
|---|---|
Use Scenario: Regulating 72V or 110V aircraft bus voltage to 3.3V for flight data recorder logic and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC converter providing isolated-system bias power with ultra-low standby draw and transient immunity. Use Value: Withstands 150V transients per DO-160 Section 22, maintains regulation during engine cranking dips, and draws <15µA in sleep-extending backup battery life. | Use Scenario: Converting unregulated 28V aircraft supply to 5V for cockpit display controllers in high-temperature zones. IC Role / Device Role / Timing Role: High-reliability buck regulator delivering stable 5V at up to 100mA across –40°C to +150°C ambient. Use Value: Qualified to 150°C junction temperature, uses no external compensation, and includes OVLO to reject load dump spikes up to 150V. |
| Downhole Oilfield Sensors | Medical Diagnostic Equipment |
Use Scenario: Powering MEMS pressure/temperature sensors in oil well drill collars where ambient exceeds 125°C. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator converting 48V–120V string voltage to 1.8V for low-power analog front-ends. Use Value: Operates continuously at 150°C junction, features 12µA quiescent current to extend battery life in sealed telemetry modules, and tolerates harsh EMI environments. | Use Scenario: Generating isolated 3.3V logic supply from 48V hospital-grade wall adapter in portable ultrasound units. IC Role / Device Role / Timing Role: Compact, low-noise primary-side regulator feeding isolated flyback or charge-pump secondary stages. Use Value: Delivers clean 3.3V at 100mA with <10mVpp ripple, supports fast load steps (1mA→100mA), and meets IEC 60601 creepage requirements via wide-input design. |
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 |
|---|---|---|---|
| LTC3639IMSE#PBF | Same architecture and pinout; rated for –40°C to 125°C junction, not 150°C. | Not suitable for sustained operation above 125°C ambient or high-power dissipation in confined enclosures. | Select LTC3639HMSE#PBF when full 150°C junction capability is required; use IMSE variant for cost-sensitive commercial-temperature designs. |
| MAX5033BASA+T | 100V max input, 125mA output, no integrated low-side switch (requires external diode), 100µA quiescent current. | Lacks synchronous rectification and Burst Mode®, resulting in higher light-load losses and reduced efficiency below 10mA. | Choose MAX5033BASA+T only if 100V input ceiling is acceptable and lowest BOM cost-not lowest power-is priority. |
Compared with LTC3639IMSE#PBF, the LTC3639HMSE#PBF adds guaranteed 150°C operation and tighter thermal derating margins; compared with MAX5033BASA+T, it delivers 8× lower quiescent current, synchronous efficiency, and integrated protection features-making it superior for high-reliability, wide-temperature, or battery-constrained systems.
Availability
LTC3639HMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power rails, downhole oilfield sensors, and medical diagnostic equipment requiring stable component supply across extended temperature and high-voltage conditions.
Supply support for LTC3639HMSE#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, datasheets, and application engineering for all Linear ICs including the LTC3639 family.
The LTC3639 product line was designed specifically for high-input-voltage, low-quiescent-current DC/DC conversion in harsh-environment applications such as industrial automation, aerospace, and energy exploration-where reliability across extreme temperature and voltage ranges is non-negotiable.
FAQ
What is the maximum input voltage rating for the LTC3639HMSE#PBF?
The LTC3639HMSE#PBF has an absolute maximum input voltage rating of 150V on the VIN pin, with a functional operating range from 4V to 150V. This enables direct regulation from high-voltage sources such as 72V telecom systems, 110V industrial buses, or battery strings without pre-regulation. Exceeding 150V risks permanent damage, even momentarily.
How does the LTC3639HMSE#PBF achieve 12µA quiescent current?
The LTC3639HMSE#PBF achieves 12µA typical quiescent current through Burst Mode® operation: during light loads, it enters a sleep cycle where internal power switches and comparators are disabled, leaving only essential bias circuitry active. This ultra-low sleep current is confirmed across the –40°C to 150°C junction temperature range and is critical for battery-powered remote sensors using the LTC3639HMSE#PBF.
Can the LTC3639HMSE#PBF be configured for a 1.8V fixed output?
Yes, the LTC3639HMSE#PBF can be configured for a precise 1.8V fixed output by shorting both VPRG1 and VPRG2 pins to the SS pin. This activates an internal resistor divider that sets the feedback threshold to 1.8V ±1.5%, eliminating external resistors and reducing noise sensitivity. The same method configures 3.3V (VPRG1=GND, VPRG2=SS) or 5V (VPRG1=SS, VPRG2=GND) outputs.
What thermal design considerations apply to the LTC3639HMSE#PBF package?
The LTC3639HMSE#PBF uses a 16-lead MSE package with an exposed GND pad (Pin 17) that must be soldered to a minimum 200mm² PCB copper area for effective heat dissipation. Thermal resistance is θJC = 10°C/W to the pad and θJA = 40°C/W to ambient. To sustain 150°C junction temperature, board layout must ensure low thermal impedance from the pad to system heatsinking or ambient airflow-especially when delivering >50mA at high VIN.
Does the LTC3639HMSE#PBF require external compensation components?
No, the LTC3639HMSE#PBF does not require external compensation components. Its current-mode Burst Mode® architecture with integrated peak current sensing and fixed-frequency hysteretic control eliminates the need for loop compensation networks. This simplifies design, reduces BOM count, and improves stability across input voltage, load, and temperature variations-confirmed in all official LTC3639HMSE#PBF application circuits.
LTC3639HMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Packaging:
- Tube
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3639HMSE#PBF FAQ
1.How can I place an order for LTC3639HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3639HMSE#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 LTC3639HMSE#PBF reliable?
The price and inventory of LTC3639HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3639HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3639HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3639HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3639HMSE#PBF?
LTC3639HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3639HMSE#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 LTC3639HMSE#PBF?
For technical support, including LTC3639HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3639HMSE#PBF requirements.
6.How does Aetrix verify that LTC3639HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3639HMSE#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 LTC3639HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3639HMSE#PBF?
All LTC3639HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3639HMSE#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 LTC3639HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3639HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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