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Analog Devices Inc. LTC3639EMSE#TRPBF
- Part No.:
- LTC3639EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3639EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,165
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Product details
Overview
LTC3639EMSE#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, delivering up to 100mA output current, featuring 12µA quiescent current in Burst Mode® operation, programmable peak current limit (17–230mA), and 0.8V ±1% feedback reference - used in industrial control supplies and avionics power rails where wide-input, low-IQ, and robust overvoltage protection are critical.
For engineers reviewing the LTC3639EMSE#TRPBF datasheet, LTC3639EMSE#TRPBF pinout, LTC3639EMSE#TRPBF application, or LTC3639EMSE#TRPBF equivalent, key selection considerations include its 4V–150V input range, internal soft-start and RUN/OVLO threshold precision (±110mV hysteresis), thermally enhanced 16-lead MSE package with exposed GND pad, and fixed/adjustable output configuration via VPRG1/VPRG2 pins.
Technical Context
The LTC3639EMSE#TRPBF employs Burst Mode® control architecture with hysteretic feedback, enabling ultra-low quiescent current (12µA) at no load while maintaining regulation. Its dual-MOSFET synchronous topology eliminates external diode losses and supports 100% duty cycle for low-dropout operation down to VOUT = VIN.
Peak current is programmable via ISET pin (17–230mA typical), directly setting maximum average output current (half the peak value). Input undervoltage lockout (3.5V rising) and programmable OVLO (1.21V threshold) provide precise input voltage window control, with automatic soft-start reset on transient events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 150V - enables direct regulation from unregulated industrial, automotive, or avionics bus voltages without pre-regulation. |
| Max Output Current | 100mA - determined by 200mA peak current limit (ISET floating); scalable down to 10mA avg via resistor programming. |
| Quiescent Current | 12µA in Burst Mode® - sustains regulated output at zero load with minimal battery drain in portable or always-on systems. |
| Feedback Reference | 0.800V ±1% - sets precise output voltage accuracy for adjustable configurations; enables 1.8V/3.3V/5V fixed outputs via VPRG pins. |
| Switch On-Resistance | Top: 4.2Ω, Bottom: 2.2Ω - defines conduction loss at rated current; optimized for efficiency across 10mA–100mA load range. |
| Soft-Start Time | 1ms internal default - prevents input supply droop during startup; externally adjustable via SS pin capacitor (6.25nF/ms). |
| UVLO Threshold | 3.5V (rising), 3.3V (falling) - ensures reliable turn-on/turn-off sequencing in noisy or brownout-prone environments. |
Pinout & Package
The LTC3639EMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP (MSE) package with four missing pins (pins 2, 4, 13, 15), featuring an exposed GND pad (Pin 17) that must be soldered to PCB ground for thermal performance (θJA = 40°C/W).
| 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 ceramic capacitor to GND for high-frequency noise suppression and energy storage. |
| FBO (5) | Feedback comparator output | Open-drain status signal indicating regulation state; useful for system monitoring or cascaded power sequencing. |
| VPRG1 / VPRG2 (6,7) | Output voltage selection | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or connecting to SS; eliminates external resistors for standard outputs. |
| GND (8,16,17) | Ground reference | Pins 8/16 are signal GND; Pin 17 is exposed thermal pad - all must connect to low-impedance PCB ground plane. |
| VFB (9) | Feedback input | Compares divided output voltage to 0.8V reference; connects to resistor divider (adjustable) or directly to VOUT (fixed). |
| SS (10) | Soft-start control | Capacitor-to-GND sets ramp time; internal 5µA current source provides linear voltage ramp for controlled startup. |
| ISET (11) | Peak current programming | Resistor-to-GND sets peak inductor current (17–230mA); determines max output current and light-load ripple tradeoff. |
| OVLO (12) | Overvoltage lockout input | Resistive divider from VIN sets disable threshold (1.21V); triggers soft-start reset on transients for graceful recovery. |
| RUN (14) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces shutdown (1.4µA IQ); supports precise UVLO with external divider. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates external Schottky diode, reducing component count and improving efficiency by >5% at 100mA vs. asynchronous designs. |
| Burst Mode® operation | Maintains regulation at no load with only 12µA supply current, extending battery life in always-on sensor nodes and remote monitors. |
| Programmable peak current limit | Adjusts IPEAK from 17mA to 230mA via single resistor, optimizing inductor size, output ripple, and light-load efficiency simultaneously. |
| Precision RUN and OVLO comparators | 110mV hysteresis ensures stable enable/disable behavior under noisy input conditions, preventing chatter during brownouts or surges. |
| 100% duty cycle capability | P-channel high-side switch enables dropout operation down to VOUT = VIN, supporting applications with collapsing input rails (e.g., battery discharge). |
Applications
| Industrial Control Supplies | Avionics Power Rails |
|---|---|
Use Scenario: Regulating 28V or 115VAC-derived DC bus to 5V/3.3V for PLC I/O modules and fieldbus transceivers in harsh factory environments. IC Role / Device Role / Timing Role: Primary non-isolated point-of-load regulator handling wide-input transients and EMI-rich conditions. Use Value: 150V absolute max rating and programmable OVLO prevent latch-up during load-dump events; 12µA IQ reduces standby power in distributed controllers. |
Use Scenario: Generating 5V for flight data recorders and inertial measurement units from 270VDC aircraft distribution buses. IC Role / Device Role / Timing Role: High-reliability step-down converter meeting DO-160 lightning-induced transient immunity requirements. Use Value: Exposed-pad MSE package ensures thermal stability at 125°C ambient; precise RUN threshold enables clean power-up sequencing after cold start. |
| Medical Imaging Sensors | Portable Test Instruments |
Use Scenario: Powering low-noise analog front-ends in ultrasound probe electronics from rechargeable Li-ion or 48V PoE-powered backplanes. IC Role / Device Role / Timing Role: Low-IQ buck regulator supplying bias to ADC drivers and op-amps with minimal self-heating. Use Value: 0.8V ±1% reference and low output ripple (<10mVp-p) ensure accurate sensor signal conditioning; Burst Mode® avoids switching noise near sensitive analog paths. |
Use Scenario: Enabling handheld multimeters and oscilloscope probes with dual-voltage rails (5V logic + 12V analog) from single 9V alkaline or Li-Po cells. IC Role / Device Role / Timing Role: Wide-input buck converter supporting both fresh-cell (9V) and depleted-cell (4.5V) operation without external boost stage. Use Value: 4V minimum input and 100% duty cycle allow full battery utilization; programmable ISET minimizes inductor size for compact form factors. |
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 |
|---|---|---|---|
| LTC3642EMSE#TRPBF | Lower max input (40V), higher IQ (25µA), same MSE package; lacks OVLO/RUN precision and 150V rating. | Restricted to 24V/48V industrial systems; unsuitable for avionics or 115VAC-derived rails. | Select only if input never exceeds 40V and cost sensitivity outweighs 150V robustness. |
| MAX5033BASA+T | Asynchronous (external diode), 76V max input, 100µA IQ, SO-8 package; no programmable current limit or Burst Mode®. | Higher dropout, lower efficiency at light loads, larger solution size due to diode and compensation components. | Consider only for legacy designs requiring SO-8 footprint and where 12µA IQ is not required. |
Compared with LTC3639EMSE#TRPBF, LTC3642EMSE#TRPBF trades 150V capability for marginally better light-load efficiency in sub-40V systems, while MAX5033BASA+T sacrifices integration and ultra-low IQ for lower unit cost and simpler design - neither offers drop-in replacement due to input voltage, package, or feature mismatches.
Availability
LTC3639EMSE#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power rails, medical imaging sensors, and portable test instruments requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC3639EMSE#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 power management portfolio, emphasizing rugged, high-voltage, and ultra-low-power analog ICs for mission-critical applications.
The LTC3639EMSE#TRPBF belongs to Linear's high-input-voltage synchronous buck regulator family, designed specifically for powering electronics in aerospace, industrial, and medical systems where input transients, wide voltage ranges, and long battery life are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3639EMSE#TRPBF?
The LTC3639EMSE#TRPBF has an absolute maximum input voltage rating of 150V, with guaranteed operation from 4V to 150V. This allows direct connection to high-voltage sources such as 115VAC-derived DC buses, 270VDC aircraft systems, or industrial 48V/96V/125V distribution rails without external pre-regulation. Exceeding 150V risks permanent damage per Absolute Maximum Ratings.
How does the LTC3639EMSE#TRPBF achieve 12µA quiescent current?
The LTC3639EMSE#TRPBF achieves 12µA quiescent current through Burst Mode® operation: during light/no load, it enters sleep cycles where internal power switches and comparators are disabled, leaving only essential bias circuitry active. The 12µA figure is typical at 25°C with VIN = 12V and no load; actual current rises with temperature and input voltage but remains below 22µA over the full –40°C to 125°C range.
Can the LTC3639EMSE#TRPBF generate a 1.8V output without external resistors?
Yes - the LTC3639EMSE#TRPBF supports fixed 1.8V output by shorting both VPRG1 and VPRG2 pins to the SS pin. This internally connects precision feedback resistors, eliminating external divider components and associated noise susceptibility. The 1.8V output is trimmed to ±1.5% over temperature and line, matching the accuracy of the 0.8V reference used in adjustable mode.
What is the role of the exposed pad (Pin 17) on the LTC3639EMSE#TRPBF package?
The exposed pad (Pin 17) on the LTC3639EMSE#TRPBF is electrically and thermally connected to GND and must be soldered to a large PCB copper area for effective heat dissipation. It reduces thermal resistance from junction to ambient (θJA) to 40°C/W and junction to case (θJC) to 10°C/W. Omitting this connection risks exceeding the 150°C maximum junction temperature under 100mA load at elevated ambient temperatures.
How is peak inductor current programmed on the LTC3639EMSE#TRPBF?
Peak inductor current on the LTC3639EMSE#TRPBF is programmed via a resistor (RISET) from the ISET pin (11) to GND. An internal 5µA current source develops a voltage across RISET, setting the peak current threshold linearly: 100mV → 20mA, 1V → 200mA. For example, a 100kΩ resistor yields ~100mA peak current (50mA max average output). Leaving ISET open sets peak current to 230mA; shorting to GND sets it to 25mA.
LTC3639EMSE#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
LTC3639EMSE#TRPBF FAQ
1.How can I place an order for LTC3639EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3639EMSE#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 LTC3639EMSE#TRPBF reliable?
The price and inventory of LTC3639EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3639EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3639EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3639EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3639EMSE#TRPBF?
LTC3639EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3639EMSE#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 LTC3639EMSE#TRPBF?
For technical support, including LTC3639EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3639EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3639EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3639EMSE#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 LTC3639EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3639EMSE#TRPBF?
All LTC3639EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3639EMSE#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 LTC3639EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3639EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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