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Analog Devices Inc. LTC3630AEMSE#PBF
- Part No.:
- LTC3630AEMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3630AEMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:382
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Product details
Overview
LTC3630AEMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, wide-input synchronous step-down DC/DC converter with integrated high-side P-channel and low-side N-channel MOSFETs. It operates from 4V to 76V input, delivers up to 500mA output current, maintains regulation down to 0.8V output, and draws only 12µA quiescent current in Burst Mode® at no load - enabling long battery life in industrial sensors and avionics power rails.
For engineers reviewing the LTC3630AEMSE#PBF datasheet, LTC3630AEMSE#PBF pinout, LTC3630AEMSE#PBF application, or LTC3630AEMSE#PBF equivalent, key selection considerations include its programmable peak current limit (100mA–1.2A), 0.8V ±1% feedback reference, 100% duty-cycle dropout capability, and support for parallel operation via FBO pin - all within a thermally enhanced 16-lead MSOP package.
Technical Context
The LTC3630AEMSE#PBF uses Burst Mode® control with hysteretic feedback to achieve ultra-low quiescent current across light-to-moderate loads. Its internal P-channel high-side switch enables true 100% duty-cycle operation for low-dropout regulation, while the N-channel synchronous rectifier eliminates external diode losses.
Peak inductor current is set by an external resistor on ISET (100kΩ → 0.6A typical), directly determining maximum average output current (50% of peak). The RUN pin provides precise undervoltage lockout (1.21V enable threshold, 110mV hysteresis), and VPRG1/VPRG2 pins select fixed 1.8V/3.3V/5V outputs or enable adjustable mode via VFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 76V - supports direct connection to 48V telecom, 60V automotive, and 72V industrial bus rails without pre-regulation. |
| Output Current | Up to 500mA - maximum average output current equals half the programmed peak inductor current (e.g., 1.2A peak → 600mA theoretical max, derated to 500mA guaranteed). |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery operation in always-on remote sensors and IoT edge nodes. |
| Feedback Reference | 0.800V ±1% - sets output voltage accuracy and enables precise 0.8V–VIN regulation range using external resistive divider. |
| Switching Architecture | Synchronous buck with integrated P-ch high-side + N-ch low-side MOSFETs - eliminates external diode, improves efficiency >90% at mid-load, reduces BOM count. |
| Package Thermal Resistance | θJA = 45°C/W (MSOP) - requires exposed pad soldered to PCB ground plane for reliable 125°C junction operation at full load. |
| Operating Temperature | –40°C to +125°C - qualified for industrial control, medical instrumentation, and under-hood automotive auxiliary supplies. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.9mm footprint, 0.75mm profile, with exposed thermal pad (Pin 17) that must be soldered to PCB ground for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection point between internal high-side and low-side MOSFETs; ties to inductor; carries high dv/dt switching waveform. |
| VIN (3) | Main input supply | Accepts 4V–76V input; requires local ceramic bypass capacitor to GND for EMI suppression and transient response. |
| RUN (5) | Enable/UVLO control | 1.21V rising threshold enables operation; 110mV hysteresis prevents chatter; internal 2MΩ pull-up allows resistor-divider UVLO setup. |
| VPRG1 / VPRG2 (6,7) | Output voltage selection | Configure fixed 1.8V/3.3V/5V or adjustable mode; shorting to SS/GND selects internal feedback divider ratio. |
| GND (8,14,16,17) | Ground reference & thermal path | Multiple ground pins plus exposed pad (Pin 17) - all must connect to low-impedance PCB ground plane for noise immunity and thermal dissipation. |
| VFB (9) | Feedback comparator input | Monitors divided output voltage; compared to 0.8V reference; open for fixed-output mode, connected to divider for adjustable mode. |
| SS (10) | Soft-start timing | Capacitor to GND sets output ramp time (1ms per 16.5nF); internal 0.8ms default if floating; resets on UVLO or shutdown. |
| ISET (11) | Peak current programming | Resistor to GND sets peak inductor current (100mA–1.2A); 5µA current source enables precise adjustment and light-load ripple filtering. |
| FBO (12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) used to parallel multiple LTC3630As by connecting to slave VFB pins. |
Key Features
| Feature | Design Value |
|---|---|
| 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 from 100mA to 1.2A via single ISET resistor - enables optimization of inductor size, output ripple, and efficiency across load range. |
| 100% duty-cycle dropout | P-channel high-side switch sustains regulation even when VIN approaches VOUT - essential for brownout resilience in automotive and industrial 12V/24V rails. |
| No compensation required | Internally compensated hysteretic control loop - eliminates external compensation network, simplifies layout, and ensures stability across all operating conditions. |
| Parallel operation support | FBO pin enables master-slave current sharing across multiple LTC3630As - scales output current beyond 500mA without external current-sense circuitry. |
Applications
| Industrial Control Power | Avionics Auxiliary Supply |
|---|---|
Use Scenario: Powering isolated analog front-ends, PLC I/O modules, and fieldbus transceivers in factory automation cabinets with 24V/48V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC regulator converting unregulated 48V bus to stable 5V or 3.3V for microcontrollers and signal conditioning ICs. Use Value: 76V absolute max rating withstands 48V bus transients; 12µA quiescent current minimizes standby power in always-on control units. |
Use Scenario: Generating 5V/3.3V rail for flight data recorders, cockpit displays, and sensor interfaces in commercial aircraft with 28V nominal bus. IC Role / Device Role / Timing Role: High-reliability point-of-load converter delivering regulated power to safety-critical avionics subsystems. Use Value: –40°C to +125°C operating range meets DO-160 environmental requirements; 16-lead MSOP package supports conformal coating and vibration resistance. |
| Medical Portable Instrumentation | Automotive Telematics Module |
Use Scenario: Power management in handheld ultrasound probes, patient monitors, and portable ECG devices powered by Li-ion batteries (10V–25V pack voltage). IC Role / Device Role / Timing Role: Efficient step-down regulator supplying 3.3V to ARM Cortex-M microcontroller and ADC/DAC signal chain. Use Value: Adjustable output (0.8V–VIN) supports dynamic voltage scaling; low EMI Burst Mode® reduces RF interference with sensitive analog measurements. |
Use Scenario: Converting 12V vehicle battery to 5V/3.3V for GPS, cellular modem, and CAN controller in fleet telematics units. IC Role / Device Role / Timing Role: Input-transient-hardened DC/DC converter handling cold-crank (4.5V) and load-dump (80V) events per ISO 7637-2. Use Value: 76V operating input and 80V absolute max rating meet automotive surge immunity standards; RUN pin enables controlled startup during battery recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609S | 42V max input, 2A output, 2.5µA IQ, requires external compensation, 3mm × 4mm LQFN package | Better suited for higher-current, lower-input-voltage applications where ultra-low IQ is critical but 76V rating not needed | Select LT8609S when output current >500mA is required and input stays ≤42V; avoid for 48V+ industrial bus use. |
| TPS54260DGQ | 60V max input, 2.5A output, 140µA IQ, external MOSFETs, SOIC-8 package, requires compensation | Higher current, lower efficiency at light load, larger solution size due to discrete FETs and external components | Choose TPS54260DGQ for cost-sensitive designs needing >500mA and where board space permits larger inductor/MOSFET layout. |
Compared with LT8609S and TPS54260DGQ, the LTC3630AEMSE#PBF uniquely combines 76V input capability, 500mA output, and 12µA quiescent current in a single IC - making it optimal for space-constrained, high-voltage, low-power industrial and avionics applications where other alternatives fall short on voltage rating or IQ.
Availability
LTC3630AEMSE#PBF is available at Aetrix Electronics and suitable for industrial control power supplies, avionics auxiliary rails, and automotive telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3630AEMSE#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, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3630A belongs to Linear's high-voltage monolithic buck converter family, designed specifically for robust, low-quiescent-power regulation in harsh environments - including industrial, medical, and aerospace applications where wide input range and reliability are paramount.
FAQ
What is the maximum input voltage the LTC3630AEMSE#PBF can safely handle?
The LTC3630AEMSE#PBF has an absolute maximum input voltage rating of 80V and a recommended operating range of 4V to 76V. Exceeding 80V may cause permanent damage. During normal operation, it reliably regulates from 4V up to 76V - making it suitable for 48V telecom, 60V industrial, and 72V battery systems. The device remains functional during input transients up to 80V, provided duration is within safe energy limits defined by thermal design.
How does the ISET pin configure peak current limit on the LTC3630AEMSE#PBF?
The ISET pin on the LTC3630AEMSE#PBF sources a 5µA (1µA in sleep mode) current that develops a voltage across an external resistor to ground, setting the peak inductor current threshold. A 100kΩ resistor yields ~0.6A peak (300mA avg), while floating ISET sets ~1.2A peak (600mA theoretical max, derated to 500mA guaranteed). Shorting ISET to GND sets ~0.12A peak. This direct programming enables precise trade-offs between efficiency, ripple, and component size.
Can the LTC3630AEMSE#PBF operate in 100% duty cycle mode, and what is its significance?
Yes, the LTC3630AEMSE#PBF supports true 100% duty cycle operation due to its integrated P-channel high-side MOSFET. When input voltage drops near the output voltage, the high-side switch remains continuously on, sustaining regulation without dropout. This is critical for automotive cold-crank (4.5V) and industrial brownout scenarios where maintaining output during input sag is essential - unlike N-channel high-side converters requiring bootstrap circuitry that fails below ~6V.
What is the purpose of the FBO pin on the LTC3630AEMSE#PBF, and how is it used?
The FBO (Feedback Comparator Output) pin on the LTC3630AEMSE#PBF is an open-drain output (20µA pull-up, 70Ω pull-down) that signals when the internal feedback comparator trips. It enables parallel operation: connecting the FBO of a "master" LTC3630AEMSE#PBF to the VFB pins of "slave" units forces all devices to regulate to the same voltage and share load current proportionally. This method avoids external current-sense amplifiers and supports scalable output current beyond 500mA.
Does the LTC3630AEMSE#PBF require external compensation components?
No, the LTC3630AEMSE#PBF uses an internally compensated hysteretic control architecture and requires no external compensation components. Its Burst Mode® operation and fixed-frequency-free design ensure inherent stability across all input voltages, output voltages, and load conditions - eliminating the need for loop compensation networks, reducing BOM count, and simplifying PCB layout for designers.
LTC3630AEMSE#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 or Negative
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 76V
- Voltage - Output (Min/Fixed):
- 0.8V (1.8V, 3.3V, 5V)
- Voltage - Output (Max):
- 76V
- Current - Output:
- 500mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3630AEMSE#PBF FAQ
1.How can I place an order for LTC3630AEMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630AEMSE#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 LTC3630AEMSE#PBF reliable?
The price and inventory of LTC3630AEMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630AEMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630AEMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630AEMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630AEMSE#PBF?
LTC3630AEMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630AEMSE#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 LTC3630AEMSE#PBF?
For technical support, including LTC3630AEMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630AEMSE#PBF requirements.
6.How does Aetrix verify that LTC3630AEMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630AEMSE#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 LTC3630AEMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630AEMSE#PBF?
All LTC3630AEMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630AEMSE#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 LTC3630AEMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3630AEMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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