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Analog Devices Inc. LTC3639EMSE#PBF
- Part No.:
- LTC3639EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3639EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,912
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Product details
Overview
LTC3639EMSE#PBF 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 input tolerance and ultra-low standby power are critical.
For engineers reviewing the LTC3639EMSE#PBF datasheet, LTC3639EMSE#PBF pinout, LTC3639EMSE#PBF application, or LTC3639EMSE#PBF equivalent, key selection considerations 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 LTC3639EMSE#PBF employs Burst Mode® control architecture with hysteretic feedback and dual internal comparators (for VFB and reverse current), enabling high efficiency across load currents from 1µA to 100mA. Its P-channel high-side switch supports 100% duty cycle for low-dropout operation, while integrated shoot-through prevention logic ensures safe synchronous switching.
It features independent voltage monitoring on RUN (1.21V enable threshold) and OVLO (1.21V disable threshold) pins, both with 110mV hysteresis, allowing precise input undervoltage and overvoltage lockout via external resistor dividers. The ISET pin sources a 5µA (1µA in sleep) current to set peak inductor current linearly from 17mA to 230mA.
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. |
| Output Voltage Range | 0.8V to VIN - enables fixed 1.8V/3.3V/5V outputs or adjustable regulation using external resistive divider. |
| Max Output Current | 100mA - determined by half the programmable peak inductor current (200mA max), ensuring stable operation under full load. |
| Quiescent Current | 12µA typical in Burst Mode® sleep - minimizes standby power loss in always-on systems such as remote sensors or avionics monitors. |
| Feedback Reference | 0.800V ±1% - provides accurate output voltage setting with minimal drift over temperature and line variations. |
| Switch On-Resistance | Top: 4.2Ω, Bottom: 2.2Ω - defines conduction losses at rated current; optimized for efficiency in 10–100mA load range. |
| Soft-Start Time | 1ms internal default - prevents input supply droop during startup; externally adjustable via SS pin capacitor. |
Pinout & Package
The LTC3639EMSE#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 pad (Pin 17) that must be soldered to PCB ground for 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 output filter. |
| VIN (3) | Main Input Supply | 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 comparator state; useful for system-level fault monitoring or sequencing. |
| VPRG1/VPRG2 (6,7) | Output Voltage Selection | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or connecting to SS pin per datasheet truth table. |
| GND (8,16,17) | Ground Reference | Three dedicated GND terminals including exposed thermal pad (Pin 17); all must connect to low-impedance PCB ground plane. |
| VFB (9) | Feedback Input | Compares divided output voltage against 0.8V reference; directly connected to output in fixed-mode configurations. |
| SS (10) | Soft-Start Control | Sources 5µA (1µA sleep) current; external capacitor sets output ramp time (1ms per 6.25nF) to limit inrush. |
| ISET (11) | Peak Current Programming | Sets peak inductor current from 17mA to 230mA via resistor-to-GND; determines max output current and ripple trade-off. |
| OVLO (12) | Overvoltage Lockout Input | Disables switching when voltage exceeds 1.21V; enables graceful recovery from transients via soft-start reset. |
| RUN (14) | Enable/Shutdown Control | Enables regulation above 1.21V; shuts down to 1.4µA when pulled below 0.7V; supports UVLO via resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Delivers >80% efficiency at 100µA load and maintains 12µA quiescent current, enabling multi-year battery life in remote IoT nodes. |
| Integrated Power Switches | Eliminates need for external MOSFETs and gate drivers, reducing BOM count and layout complexity in space-constrained HV applications. |
| Programmable Peak Current Limit | Adjusts inductor current threshold from 17mA to 230mA, allowing optimization of efficiency, ripple, and component size for specific load profiles. |
| Precision RUN and OVLO Thresholds | 1.21V ±110mV hysteresis on both pins enables robust, repeatable input voltage window control without external comparators. |
| No Compensation Required | Internal compensation eliminates external RC networks, simplifying design validation and improving production yield across temperature and process variation. |
Applications
| Industrial Control Supplies | Avionics Power Rails |
|---|---|
Use Scenario: Regulating 110VDC aircraft bus to 3.3V for flight data recorder interface ICs. IC Role / Device Role / Timing Role: Primary HV-to-LV DC/DC converter providing isolated, low-noise 3.3V rail with fast transient response. Use Value: Withstands 150V transients per DO-160 Section 22, maintains 12µA sleep current during standby, and delivers clean 3.3V output via fixed VPRG configuration. | Use Scenario: Powering sensor signal conditioning circuits in engine control units exposed to 72V battery transients. IC Role / Device Role / Timing Role: High-reliability step-down regulator handling wide input swings while maintaining regulated 5V for analog front-ends. Use Value: 150V absolute max rating and programmable OVLO prevent latch-up during load dump; 0.8V reference ensures tight 5V accuracy over –40°C to 125°C. |
| Medical Device Auxiliary Power | Portable Instrument HV Bias |
Use Scenario: Generating isolated 1.8V supply for low-power microcontrollers in portable ultrasound probes. IC Role / Device Role / Timing Role: Ultra-low-quiescent buck converter powering MCU during long idle periods between imaging bursts. Use Value: 12µA sleep current extends battery runtime; adjustable output allows precise 1.8V setting matching MCU VDD requirements. | Use Scenario: Providing stable 5V bias for photomultiplier tube (PMT) anode chains in handheld radiation detectors. IC Role / Device Role / Timing Role: HV input regulator delivering low-noise, ripple-free 5V from 48V Li-ion stack with minimal EMI impact on sensitive analog stages. Use Value: Synchronous operation and internal MOSFETs reduce output ripple; Burst Mode® suppresses switching noise during measurement windows. |
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 |
|---|---|---|---|
| LT3995EMSE#PBF | Lower max input (60V), higher max output current (200mA), 2.5µA IQ, different pinout and control scheme (constant frequency vs Burst Mode®). | Better suited for lower-voltage, higher-current automotive infotainment rails; lacks 150V capability and programmable OVLO. | Select LT3995EMSE#PBF only if input stays ≤60V and higher output current is required; not drop-in compatible due to pinout and control differences. |
| MAX5033BASA+T | 100V max input, 125mA output, 100µA IQ, no integrated low-side switch (requires external diode), no programmable peak current. | Acceptable for cost-sensitive industrial supplies where 150V rating and ultra-low IQ are not mandatory. | Choose MAX5033BASA+T for simpler designs with moderate IQ tolerance and lower HV margin; verify thermal performance without synchronous rectification. |
Compared with LT3995EMSE#PBF and MAX5033BASA+T, the LTC3639EMSE#PBF uniquely combines 150V input tolerance, 12µA quiescent current, programmable peak current, and integrated synchronous switches-making it the only option for compact, ultra-low-power HV buck conversion in harsh environments.
Availability
LTC3639EMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power rails, medical device auxiliary power, and portable instrument HV bias requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3639EMSE#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 continues its legacy of precision analog and power management ICs for demanding applications.
The LTC3639EMSE#PBF belongs to Linear's high-voltage monolithic DC/DC regulator product line, designed specifically for reliable, low-quiescent-power conversion in aerospace, industrial, and medical systems operating from unregulated HV sources.
FAQ
What is the maximum input voltage rating for the LTC3639EMSE#PBF?
The LTC3639EMSE#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 110VDC aircraft buses or industrial 72V/96V systems without external pre-regulation. Exceeding 150V risks permanent damage, even briefly.
How does the LTC3639EMSE#PBF achieve 12µA quiescent current?
The LTC3639EMSE#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. The 5µA ISET current reduces to 1µA in sleep, and the feedback comparator hysteresis (5mV) minimizes wake-up frequency-ensuring LTC3639EMSE#PBF sustains ultra-low IQ across temperature and line variations.
Can the LTC3639EMSE#PBF be configured for a fixed 5V output without external resistors?
Yes, the LTC3639EMSE#PBF can be configured for a fixed 5V output by shorting VPRG1 to the SS pin and VPRG2 to GND. In this configuration, internal feedback resistors set VFB to 5.015V ±0.075V, eliminating the need for external divider components. The LTC3639EMSE#PBF then regulates directly to 5V with no additional parts-reducing BOM count and improving noise immunity on the feedback path.
What is the purpose of the FBO pin on the LTC3639EMSE#PBF?
On the LTC3639EMSE#PBF, the FBO (Feedback Comparator Output) pin is an open-drain output that asserts low when the feedback comparator detects VFB exceeding its threshold (e.g., during overvoltage or startup overshoot). It sources ~20µA when high and has ~70Ω pull-down impedance when low. Engineers use FBO for system-level fault signaling, power-good indication, or sequencing control-without requiring additional comparators or logic.
Does the LTC3639EMSE#PBF require external compensation components?
No, the LTC3639EMSE#PBF does not require external compensation components. Its control loop is internally compensated, enabling stable operation with only the recommended input/output capacitors and inductor. This eliminates tuning effort, improves production consistency, and avoids instability risks from layout parasitics-making LTC3639EMSE#PBF suitable for rapid prototyping and high-reliability deployments where design margin is critical.
LTC3639EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3639EMSE#PBF FAQ
1.How can I place an order for LTC3639EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3639EMSE#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 LTC3639EMSE#PBF reliable?
The price and inventory of LTC3639EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3639EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3639EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3639EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3639EMSE#PBF?
LTC3639EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3639EMSE#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 LTC3639EMSE#PBF?
For technical support, including LTC3639EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3639EMSE#PBF requirements.
6.How does Aetrix verify that LTC3639EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3639EMSE#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 LTC3639EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3639EMSE#PBF?
All LTC3639EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3639EMSE#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 LTC3639EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3639EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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