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Analog Devices Inc. LTC3639HMSE#TRPBF
- Part No.:
- LTC3639HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3639HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,968
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Product details
Overview
LTC3639HMSE#TRPBF 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 down to 0.8V output, and draws only 12µA quiescent current in Burst Mode® at no load - ideal for industrial control supplies and battery-operated devices requiring ultra-low standby power.
For engineers reviewing the LTC3639HMSE#TRPBF datasheet, LTC3639HMSE#TRPBF pinout, LTC3639HMSE#TRPBF application, or LTC3639HMSE#TRPBF equivalent, key selection considerations include its programmable peak current limit (17–230mA), precise RUN/OVLO thresholds (±110mV hysteresis), 0.8V ±1% feedback reference, 100% duty-cycle dropout capability, and thermally enhanced 16-lead MSE package with exposed GND pad.
Technical Context
The LTC3639HMSE#TRPBF implements Burst Mode® control with hysteretic feedback, enabling high efficiency across 1µA–100mA load range by alternating between active burst cycles and deep-sleep intervals. Its internal 0.8V reference compares against VFB to trigger sleep when output voltage exceeds regulation, then resumes switching when VFB drops 5mV below threshold.
Peak current is set via ISET pin using a resistor-to-GND (100kΩ yields ~100mA peak), directly determining maximum average output current (½ × IPEAK). The RUN and OVLO pins provide independent, precision-programmable undervoltage lockout (UVLO) and overvoltage lockout (OVLO) with 110mV hysteresis, while soft-start is configurable via SS pin capacitor or internal 1ms default.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 150V - supports direct regulation from unregulated industrial rails, automotive batteries, or PoE-derived supplies without pre-regulation. |
| Output Voltage Range | 0.8V to VIN - enables adjustable outputs or fixed 1.8V/3.3V/5V via VPRG1/VPRG2 pin strapping, eliminating external feedback resistors for standard voltages. |
| Max Output Current | 100mA - achievable with 230mA peak current setting (ISET floating); reduced to 50mA or 12.5mA with 100kΩ or shorted ISET, respectively. |
| Quiescent Current | 12µA typical in Burst Mode® - sustains regulated output at zero load while minimizing battery drain in always-on systems. |
| Feedback Reference | 0.800V ±1% - provides stable regulation point for adjustable configurations; fixed-output variants use internal resistor dividers referenced to this same precision bandgap. |
| Operating Temp Range | –40°C to +150°C junction - rated for harsh environments including under-hood automotive, avionics, and industrial motor controls. |
| Package Thermal RJA | 40°C/W - achieved via 16-lead MSE package with exposed GND pad soldered to PCB thermal plane, enabling 1W+ dissipation at 125°C ambient. |
Pinout & Package
The LTC3639HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP (MSE) package with four missing pins (pins 2, 4, 13, 15), exposing a GND pad (pin 17) that must be soldered to the PCB for thermal performance. Pin pitch is 0.5mm; body dimensions are 4.0mm × 5.0mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; carries full switching current; requires low-inductance layout to minimize EMI and voltage spikes. |
| VIN (3) | Main input supply | Accepts 4V–150V; bypassed with ≥1µF X7R ceramic capacitor close to pin to suppress high-frequency ripple. |
| FBO (5) | Feedback comparator output | Open-drain flag indicating regulation status; pulls low when VFB > 0.805V, useful for system monitoring or sequencing. |
| VPRG1/VPRG2 (6,7) | Output voltage selection | Strap combinations select 1.8V/3.3V/5V fixed outputs or enable adjustable mode (both grounded). |
| GND (8,16,17) | Ground reference & thermal path | Pins 8/16 are signal GND; exposed pad (17) is mandatory GND connection for thermal management and noise reduction. |
| VFB (9) | Feedback input | Compares output voltage (via divider) to 0.8V reference; connects directly to VOUT for fixed-output configurations. |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time (1ms per 6.25nF); floating defaults to internal 1ms soft-start for controlled startup. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak inductor current (17–230mA); determines max output current and light-load efficiency trade-off. |
| OVLO (12) | Overvoltage lockout input | Resistor divider from VIN sets shutdown threshold (1.21V rising); prevents operation during input transients above safe level. |
| RUN (14) | Enable/disable control | Resistor divider sets UVLO threshold (1.21V rising); forces shutdown below 0.7V, reducing IQ to 1.4µA. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates external diode and reduces conduction losses - enables >85% efficiency at 10mA load with 48V→5V conversion. |
| Burst Mode® operation | Maintains regulation at microamp loads while limiting average IQ to 12µA - extends battery life in always-on sensor nodes. |
| Programmable peak current limit | Adjusts IPEAK from 17mA to 230mA via single resistor - optimizes inductor size, output ripple, and efficiency for specific load profiles. |
| 100% duty-cycle dropout | P-channel high-side switch allows continuous conduction when VIN ≈ VOUT - critical for brownout resilience in wide-input industrial systems. |
| Precision RUN/OVLO comparators | 110mV hysteresis ensures glitch-free enable/disable during noisy supply transitions - avoids false triggering in electrically harsh environments. |
Applications
| Industrial Control Supplies | Avionics Power Conditioning |
|---|---|
Use Scenario: Regulating 150V aircraft bus down to 5V for flight data recorders and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck converter providing isolated-system auxiliary power with high-reliability startup and transient immunity. Use Value: Withstands 150V input surges and operates reliably from –40°C to +150°C junction, meeting DO-160 Section 22 surge requirements. | Use Scenario: Powering low-power FPGA configuration circuits from variable 28V–72V military-grade DC supplies. IC Role / Device Role / Timing Role: Efficient, low-noise point-of-load regulator delivering stable 3.3V with minimal board space and thermal overhead. Use Value: Fixed 3.3V output (VPRG1=GND, VPRG2=SS) eliminates feedback resistors; 12µA IQ preserves battery backup runtime during standby. |
| Portable Medical Instruments | Distributed Battery Management Systems |
Use Scenario: Supplying 1.8V to low-power ADCs and microcontrollers in handheld ultrasound probes powered by Li-ion packs. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling multi-day operation on single charge via ultra-low IQ and adaptive light-load operation. Use Value: Programmable ISET allows tuning peak current to match sensor burst-mode loads, reducing output ripple without sacrificing efficiency. | Use Scenario: Generating 5V bias for isolated CAN transceivers across 12-cell (up to 50V) lithium battery stacks in EV BMS modules. IC Role / Device Role / Timing Role: Wide-input buck regulator interfacing directly with high-voltage battery monitor ICs, supporting hot-swap and cell-balancing sequencing. Use Value: OVLO pin enables programmable overvoltage shutdown at 52V, protecting downstream circuitry during cell imbalance events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652IMSE#TRPBF | 40V max input, 2A output, integrated battery charger; no programmable ISET or 150V rating. | Designed for solar/battery charging, not wide-input industrial regulation. | Select only if input <40V and battery charging functionality is required. |
| MAX5033BASA+ | 76V max input, 125mA output, no Burst Mode®, higher 100µA IQ, no programmable OVLO/RUN. | Lower voltage range, less precise enable/lockout, suited for telecom but not avionics-grade transients. | Choose when cost sensitivity outweighs 150V tolerance and ultra-low IQ needs. |
Compared with LT3652IMSE#TRPBF and MAX5033BASA+, the LTC3639HMSE#TRPBF uniquely combines 150V input capability, 12µA Burst Mode® IQ, and dual programmable protection thresholds - making it irreplaceable for high-reliability, wide-input, low-quiescent applications where alternatives lack either voltage range, efficiency, or control flexibility.
Availability
LTC3639HMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power conditioning, and portable medical instruments requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3639HMSE#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio. Linear Technology was renowned for precision DC/DC regulators, references, and signal conditioning ICs targeting demanding industrial and aerospace applications.
The LTC3639HMSE#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, engineered specifically for robust, low-IQ power conversion in systems with wide-input voltage sources - such as industrial automation, test equipment, and defense electronics.
FAQ
What is the maximum input voltage rating for the LTC3639HMSE#TRPBF?
The LTC3639HMSE#TRPBF has an absolute maximum input voltage rating of 150V, with guaranteed operation from 4V to 150V. This enables direct regulation from high-voltage sources like industrial 120VAC rectified rails or PoE++ injectors without external pre-regulation stages. Exceeding 150V risks permanent damage per Absolute Maximum Ratings.
How does the LTC3639HMSE#TRPBF achieve 12µA quiescent current?
The LTC3639HMSE#TRPBF achieves 12µA typical quiescent current through Burst Mode® operation: during light loads, it enters deep-sleep intervals where internal power switches and comparators are disabled, leaving only essential bias circuitry active. This architecture minimizes average supply current while maintaining output regulation - a key advantage over conventional PWM regulators.
Can the LTC3639HMSE#TRPBF deliver 100mA output continuously?
Yes, the LTC3639HMSE#TRPBF can deliver 100mA continuous output current when configured with ISET floating (230mA peak current limit), provided thermal design supports the resulting power dissipation. At 150V→5V conversion, thermal limits require careful PCB layout with the exposed GND pad fully soldered to minimize junction temperature rise.
What is the function of the FBO pin on the LTC3639HMSE#TRPBF?
The FBO (Feedback Comparator Output) pin on the LTC3639HMSE#TRPBF is an open-drain output that pulls low when the feedback voltage (VFB) exceeds 0.805V, indicating the output is in regulation. It can drive LEDs, microcontroller GPIOs, or enable signals for downstream circuitry - providing real-time status without additional sensing components.
Does the LTC3639HMSE#TRPBF support adjustable output voltages?
Yes, the LTC3639HMSE#TRPBF supports adjustable output voltages from 0.8V to VIN by grounding both VPRG1 and VPRG2 pins and connecting VFB to a resistive divider from VOUT to GND. The internal 0.800V ±1% reference serves as the regulation point, enabling precise custom output settings without external op-amps or references.
LTC3639HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3639HMSE#TRPBF FAQ
1.How can I place an order for LTC3639HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3639HMSE#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 LTC3639HMSE#TRPBF reliable?
The price and inventory of LTC3639HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3639HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3639HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3639HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3639HMSE#TRPBF?
LTC3639HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3639HMSE#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 LTC3639HMSE#TRPBF?
For technical support, including LTC3639HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3639HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3639HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3639HMSE#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 LTC3639HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3639HMSE#TRPBF?
All LTC3639HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3639HMSE#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 LTC3639HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3639HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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