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Analog Devices Inc. LTC3630HMSE#PBF
- Part No.:
- LTC3630HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3630HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:907
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Product details
Overview
LTC3630HMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 4V to 65V input, synchronous step-down DC/DC converter with integrated high-side P-channel and low-side N-channel MOSFETs, delivering up to 500mA output current, featuring 12µA quiescent current in Burst Mode® operation, and supporting programmable peak current limits from 120mA to 1.2A. It is used in industrial control supplies and battery-operated devices requiring wide-input, low-quiescent-power regulation.
For engineers reviewing the LTC3630HMSE#PBF datasheet, LTC3630HMSE#PBF pinout, LTC3630HMSE#PBF application, or LTC3630HMSE#PBF equivalent, key selection considerations include its –40°C to 150°C operating junction temperature range, MSE16 thermally-enhanced MSOP package, 0.8V ±1% feedback reference, adjustable or fixed 1.8V/3.3V/5V output configuration, and parallelability via FBO pin for higher-current designs.
Technical Context
The LTC3630HMSE#PBF implements Burst Mode® control with hysteretic feedback, using an internal 0.8V reference and precision RUN comparator (1.21V rising threshold, 110mV hysteresis) to enable robust start-up across wide input conditions. Its architecture integrates both power switches and eliminates external compensation requirements.
It supports dropout operation at 100% duty cycle via the P-channel high-side switch, enables output current scaling through ISET-pin resistor programming (5µA current source), and allows multi-device current sharing via the open-drain FBO pin connected to slave VFB inputs - all while maintaining stable regulation from 0.8V to VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 65V - supports direct regulation from 12V, 24V, 48V industrial rails and automotive battery transients. |
| Max Output Current | 500mA - average load current, limited to 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 >10-year battery life in always-on sensor nodes with microamp-level standby draw. |
| Feedback Reference | 0.8V ±1% - provides precise output voltage setting accuracy for adjustable configurations; enables <1% output tolerance with standard 1% resistors. |
| Operating Temp Range | –40°C to +150°C junction - qualified for under-hood automotive, avionics, and high-temperature industrial environments. |
| Package | MSE16 (16-lead MSOP, 3mm × 4.9mm) with exposed thermal pad - delivers θJA = 45°C/W for reliable high-power-density layout without heatsinks. |
| Peak Current Limit | Programmable 120mA to 1.2A via ISET pin resistor - allows optimization of inductor size, output ripple, and light-load efficiency trade-offs. |
Pinout & Package
MSE16 (16-lead plastic MSOP) package with exposed GND pad (Pin 17) requiring PCB soldering for thermal performance. θJA = 45°C/W, θJC = 10°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–65V; must be bypassed with ceramic capacitor close to pin to suppress high-frequency noise and supply impedance. |
| RUN (5) | Enable/control input | 1.21V rising threshold enables operation; 110mV hysteresis prevents chatter; supports precision UVLO via resistor divider from VIN. |
| VPRG1/VPRG2 (6,7) | Output voltage selection | Configure fixed 1.8V/3.3V/5V or adjustable mode by grounding or tying to SS; eliminates external feedback resistors for common outputs. |
| GND (8,14,16,17) | Ground reference & thermal path | Multiple ground pins and exposed pad reduce thermal resistance and improve noise immunity; pad must be soldered to PCB ground plane. |
| VFB (9) | Feedback input | Compares divided output voltage to 0.8V reference; in fixed-output mode, directly tied to VOUT; sensitive node requiring short trace routing. |
| SS (10) | Soft-start control | Capacitor to GND sets ramp time (1ms per 16.5nF); internal 0.8ms default ensures controlled start-up without input droop. |
| ISET (11) | Peak current programming | 5µA current source sets peak current limit (120mA–1.2A); resistor-to-GND determines value; optional CISET reduces light-load ripple. |
| FBO (12) | Feedback comparator output | Open-drain output (70Ω pull-down, 20µA pull-up) enables master-slave paralleling of multiple LTC3630s for >500mA total output. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates external diode and reduces conduction losses - enables >90% efficiency at 500mA with 12V→5V conversion. |
| Burst Mode® operation | Maintains regulation at ultra-low load while drawing only 12µA - critical for energy harvesting and long-life battery systems. |
| No external compensation required | Reduces BOM count and layout sensitivity - simplifies design validation and accelerates time-to-market for space-constrained applications. |
| 100% duty-cycle dropout capability | Enables regulation down to VIN ≈ VOUT - supports brownout resilience in automotive and industrial power systems during voltage sags. |
| Parallelable architecture via FBO | Allows scalable current delivery without redesign - two LTC3630HMSE#PBF devices deliver ~1A with matched current sharing and synchronized burst timing. |
Applications
| Industrial Control Supplies | Avionics Power Management |
|---|---|
|
Use Scenario: Regulating 24V or 28V aircraft bus to 3.3V/5V for flight-critical sensors and data acquisition units. IC Role / Device Role / Timing Role: Primary point-of-load regulator providing isolated, low-noise, high-reliability DC power with thermal shutdown and UVLO protection. Use Value: The –40°C to +150°C rating and 65V absolute max input withstand transient surges per DO-160 Section 22, while 12µA quiescent current extends backup battery runtime. |
Use Scenario: Powering navigation computers and inertial measurement units (IMUs) in compact, conduction-cooled avionics enclosures. IC Role / Device Role / Timing Role: High-efficiency, thermally robust buck converter delivering stable 5V from variable 27V–32V aircraft supply. Use Value: MSE16 package with exposed pad achieves <45°C/W θJA, enabling full 500mA output without forced air - critical for sealed, fanless avionics modules. |
| Automotive Under-Hood Systems | Portable Medical Instruments |
|
Use Scenario: Converting 12V battery rail to 3.3V for engine control unit (ECU) interface logic and CAN transceivers in high-ambient-temperature environments. IC Role / Device Role / Timing Role: Input-tolerant, high-temp DC/DC regulator with precise RUN threshold for controlled cold-cranking startup. Use Value: 150°C junction rating and 3.5V UVLO guarantee operation during cranking dips; programmable peak current minimizes inductor size for tight ECU packaging. |
Use Scenario: Powering handheld ultrasound or glucose monitoring devices from single-cell Li-ion (3.0V–4.2V) or dual-cell alkaline batteries. IC Role / Device Role / Timing Role: Wide-input buck converter enabling direct battery connection without pre-regulation, extending usable battery voltage range. Use Value: 4V min input allows operation down to near-empty battery; 12µA quiescent current preserves charge during standby - enabling >3-month shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630HDHC#PBF | Same electrical specs, but in 5mm × 3mm DFN package with θJA = 43°C/W and identical –40°C to +150°C rating. | Better thermal performance in high-airflow or board-level conduction-cooled layouts; requires different footprint and reflow profile. | Select when PCB real estate permits larger DFN and thermal performance is prioritized over MSOP compatibility. |
| LTC3630IMSE#PBF | Identical MSE16 package and pinout, but rated for –40°C to +125°C junction temperature (not 150°C). | Lower cost option suitable for non-extreme ambient environments such as factory-floor controllers or consumer-grade portable equipment. | Choose for cost-sensitive industrial applications where ambient temperature remains below 105°C and full 150°C rating is unnecessary. |
Compared with LTC3630HMSE#PBF, the HDHC variant offers marginally better thermal resistance in a larger footprint, while the IMSE variant trades 25°C junction headroom for lower procurement cost - neither is pin-compatible drop-in replacement without thermal or environmental reassessment.
Availability
LTC3630HMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power management, and automotive under-hood systems requiring stable component supply with extended temperature qualification and long-term lifecycle support.
Supply support for LTC3630HMSE#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 of high-performance power management ICs.
The LTC3630HMSE#PBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for rugged, wide-input industrial, automotive, and aerospace applications where reliability, low quiescent current, and thermal resilience are mandatory.
FAQ
What is the maximum junction temperature rating for the LTC3630HMSE#PBF?
The LTC3630HMSE#PBF is specified for continuous operation from –40°C to +150°C junction temperature. This H-grade qualification exceeds standard industrial ratings and enables use in under-hood automotive, avionics, and high-ambient industrial environments where thermal margins are constrained. Derating guidelines apply above 125°C to ensure long-term reliability.
How does the ISET pin on the LTC3630HMSE#PBF set output current capability?
The ISET pin on the LTC3630HMSE#PBF sources a 5µA (1µA in sleep mode) current that develops a voltage across an external resistor to ground, which directly programs the peak inductor current comparator threshold. With RISET = 220kΩ, the LTC3630HMSE#PBF delivers ~500mA average output; shorting ISET to GND sets minimum peak current (~120mA), while leaving it open yields maximum (~1.2A), limiting average output to 500mA per datasheet guarantee.
Can multiple LTC3630HMSE#PBF devices be paralleled, and how is current sharing achieved?
Yes - the LTC3630HMSE#PBF supports current sharing via its FBO (feedback comparator output) pin. Connecting the FBO of one "master" LTC3630HMSE#PBF to the VFB pins of "slave" devices forces all units to regulate to the same feedback voltage, enabling balanced current sharing. Layout symmetry and matched inductors are required for optimal matching; typical imbalance is <10% across two devices.
What is the purpose of the VPRG1 and VPRG2 pins on the LTC3630HMSE#PBF?
The VPRG1 and VPRG2 pins on the LTC3630HMSE#PBF configure internal feedback resistor networks to select fixed output voltages: tying both to GND enables adjustable mode (0.8V reference); shorting VPRG1 to SS and VPRG2 to GND selects 5V; VPRG1 to GND and VPRG2 to SS selects 3.3V; both to SS selects 1.8V. This eliminates external resistors for common outputs while preserving precision.
Does the LTC3630HMSE#PBF require external compensation components?
No - the LTC3630HMSE#PBF uses a proprietary hysteretic control architecture with internal compensation, eliminating the need for external Type II or Type III compensation networks. This reduces BOM count, simplifies layout, and removes stability tuning steps, making it ideal for rapid prototyping and space-constrained designs where loop compensation complexity must be avoided.
LTC3630HMSE#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):
- 65V
- Voltage - Output (Min/Fixed):
- 0.8V (1.8V, 3.3V, 5V)
- Voltage - Output (Max):
- 65V
- Current - Output:
- 500mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3630HMSE#PBF FAQ
1.How can I place an order for LTC3630HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630HMSE#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 LTC3630HMSE#PBF reliable?
The price and inventory of LTC3630HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630HMSE#PBF?
LTC3630HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630HMSE#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 LTC3630HMSE#PBF?
For technical support, including LTC3630HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630HMSE#PBF requirements.
6.How does Aetrix verify that LTC3630HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630HMSE#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 LTC3630HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630HMSE#PBF?
All LTC3630HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630HMSE#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 LTC3630HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3630HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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