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Analog Devices Inc. LTC3630IMSE#PBF
- Part No.:
- LTC3630IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3630IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:558
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Product details
Overview
LTC3630IMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 4V–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, 0.8V ±1% feedback reference, and programmable peak current limit from 120mA to 1.2A. It enables compact, low-noise power supplies for battery-backed industrial sensors and avionics subsystems.
For engineers reviewing the LTC3630IMSE#PBF datasheet, LTC3630IMSE#PBF pinout, LTC3630IMSE#PBF application, or LTC3630IMSE#PBF equivalent, key selection considerations include its wide 4V–65V input range, internal MOSFET integration eliminating external switches, precise RUN pin threshold (1.21V rising), 16-lead MSOP package with exposed thermal pad, and support for fixed (1.8V/3.3V/5V) or adjustable (0.8V–VIN) outputs without compensation.
Technical Context
The LTC3630IMSE#PBF employs Burst Mode® control with hysteretic feedback, where regulation is maintained by alternating short burst cycles (with switching enabled) and sleep cycles (with both power switches off and only 12µA VIN supply current). Its internal 0.8V reference compares against VFB, and output voltage is set either via external resistor divider (VPRG1/VPRG2 grounded) or internal resistors (VPRG1/VPRG2 tied to SS or GND).
Peak inductor current is programmed via ISET pin using a resistor-to-GND (100kΩ–1MΩ), enabling optimization of efficiency, ripple, and component size; maximum average output current is half the programmed peak current. The device supports 100% duty-cycle dropout operation using its P-channel high-side switch and includes overtemperature shutdown (~180°C) and precise undervoltage lockout (3.5V typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 65V - supports direct regulation from 12V, 24V, 48V industrial buses and automotive battery transients. |
| Output Current | Up to 500mA average - limited by peak current setting; max average = 0.5 × IPEAK. |
| Quiescent Current | 12µA in Burst Mode® - enables multi-year battery life in always-on remote sensors. |
| Feedback Reference | 0.800V ±1% - enables accurate output regulation down to 0.8V with minimal external components. |
| Switching Architecture | Synchronous buck with internal P-ch high-side and N-ch low-side MOSFETs - eliminates external diode and reduces conduction loss. |
| Soft-Start | Internal 0.8ms + external capacitor programmable - prevents input droop during cold-start in distributed power systems. |
| Thermal Package | 16-lead MSOP with exposed GND pad (θJA = 45°C/W) - requires PCB thermal vias for >300mA continuous operation at 65VIN. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.9mm × 1.1mm, with exposed thermal pad (Pin 17) soldered to PCB GND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection point between internal high-side and low-side MOSFETs; ties directly to inductor. |
| VIN (3) | Main input supply | Accepts 4V–65V; requires local ceramic bypass capacitor to GND for stability. |
| RUN (5) | Enable/disable control | 1.21V rising threshold enables operation; <0.7V forces 5µA shutdown; internal 2MΩ pull-up. |
| VPRG1 (6), VPRG2 (7) | Output voltage selection | Configures fixed 1.8V/3.3V/5V or adjustable mode via grounding or SS tie. |
| GND (8,14,16,17) | Ground reference & thermal path | Multiple pins + exposed pad must be connected to PCB ground plane for thermal and EMI integrity. |
| VFB (9) | Feedback input | Monitors output via resistor divider (adjustable) or connects directly to output (fixed modes). |
| SS (10) | Soft-start timing | Capacitor-to-GND sets ramp time (1ms per 16.5nF); floating defaults to 0.8ms internal soft-start. |
| ISET (11) | Peak current programming | Resistor-to-GND sets IPEAK (120mA–1.2A); 5µA current source enables precision adjustment. |
| FBO (12) | Feedback comparator output | Open-drain output (70Ω pull-down) to parallel multiple LTC3630s for higher current. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at light loads with only 12µA VIN current, enabling ultra-low-power standby in portable instruments. |
| Integrated power switches | Eliminates need for external high-side P-MOSFET and low-side N-MOSFET, reducing BOM count and layout area. |
| Programmable peak current limit | Adjusts IPEAK from 120mA to 1.2A via single resistor, allowing trade-off between efficiency, ripple, and inductor size. |
| 100% duty-cycle dropout | P-channel high-side switch sustains regulation down to VIN ≈ VOUT, critical for brownout resilience in automotive and avionics. |
| Precise RUN pin threshold | 1.21V rising / 1.10V falling with 110mV hysteresis enables reliable, noise-immune input voltage monitoring and sequencing. |
Applications
| Industrial Control Supplies | Avionics Power Modules |
|---|---|
Use Scenario: Regulating 24V or 28V aircraft bus to 3.3V for flight data recorder logic. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing isolated, low-noise 3.3V rail with startup sequencing via RUN pin. Use Value: 65V absolute max rating withstands load dump transients; 12µA quiescent current extends backup battery life during pre-flight standby. |
Use Scenario: Powering inertial measurement unit (IMU) analog front-end from 270V DC aircraft supply. IC Role / Device Role / Timing Role: High-voltage intermediate regulator stepping 270V down to 12V, feeding downstream low-noise LDOs. Use Value: Wide 4V–65V input range accommodates upstream DC-DC stage output; MSE16 package meets strict board area constraints. |
| Medical Diagnostic Sensors | Battery-Operated Portable Instruments |
Use Scenario: Supplying 1.8V to low-power ADC and wireless transceiver in handheld ultrasound probe. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 1.8V with external feedback divider and soft-start. Use Value: Programmable ISET allows peak current reduction to minimize inductor size and EMI; 0.8V reference ensures accuracy across temperature. |
Use Scenario: Powering microcontroller and OLED display in field-deployable gas detector running on two Li-ion cells (6V–8.4V). IC Role / Device Role / Timing Role: Main system regulator delivering 500mA at 3.3V with automatic transition into Burst Mode® during sensor sleep cycles. Use Value: 12µA no-load current extends runtime beyond 12 months on single charge; RUN pin enables MCU-controlled power gating. |
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 |
|---|---|---|---|
| LT8609SIS8#PBF | 42V max input, 2A output, Silent Switcher® architecture, 2.5µA quiescent current, 3mm × 4mm 8-lead SOIC. | Higher current, lower IQ, but narrower input range; lacks programmable peak current and FBO paralleling. | Preferred for space-constrained, ultra-low-IQ designs where 42V input suffices and paralleling is unnecessary. |
| TPS54360BDRCT | 60V max input, 3.5A output, external MOSFETs required, 145µA quiescent current, 10-pin WSON. | Higher current capability but needs external FETs and compensation; no integrated soft-start or RUN hysteresis. | Selected when >500mA is needed and design can accommodate external power stage and tuning effort. |
Compared with LT8609SIS8#PBF and TPS54360BDRCT, the LTC3630IMSE#PBF uniquely balances ultra-wide 4V–65V input, integrated dual MOSFETs, programmable current limiting, and FBO-based current sharing-making it optimal for ruggedized, medium-current, multi-rail industrial and aerospace systems where layout simplicity and transient robustness are prioritized over minimum IQ or maximum output current.
Availability
LTC3630IMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power modules, and battery-operated portable instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3630IMSE#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 all Linear ICs including the LTC3630 series.
The LTC3630IMSE#PBF belongs to Linear's high-voltage monolithic DC/DC converter family, designed specifically for demanding applications in industrial automation, medical instrumentation, and aerospace where input transients, wide voltage range, and low quiescent current are critical.
FAQ
What is the operating junction temperature range for the LTC3630IMSE#PBF?
The LTC3630IMSE#PBF is rated for –40°C to 125°C operating junction temperature. This industrial-grade specification ensures reliable operation in harsh environments such as factory-floor controllers and airborne electronics enclosures. Thermal derating applies above 125°C, and the exposed pad must be soldered to a thermally robust PCB ground plane to maintain this rating under 500mA load at high input voltages.
How does the ISET pin on the LTC3630IMSE#PBF control output current?
The ISET pin on the LTC3630IMSE#PBF sources a 5µA (active) or 1µA (sleep) current that develops a voltage across an external resistor to GND, setting the peak inductor current threshold from 120mA to 1.2A. Since maximum average output current equals half the peak current, a 220kΩ resistor yields ~500mA average output. This direct programming eliminates loop compensation and simplifies design versus traditional current-mode controllers.
Can the LTC3630IMSE#PBF be used in parallel for higher output current?
Yes, the LTC3630IMSE#PBF supports current sharing via its FBO (feedback comparator output) pin. Connecting the FBO of a master LTC3630IMSE#PBF to the VFB pins of one or more slave units forces synchronized regulation and distributes load current proportionally. This method avoids external current-sense amplifiers and maintains tight output voltage matching (<±1%) across paralleled devices without requiring matched inductors or resistors.
What output voltage options does the LTC3630IMSE#PBF support?
The LTC3630IMSE#PBF supports four factory-configured output voltages: 1.8V, 3.3V, and 5V (via VPRG1/VPRG2 pin strapping), plus fully adjustable 0.8V–VIN operation (with both VPRG pins grounded). All modes use the same 0.800V ±1% internal reference, ensuring consistent accuracy. No external compensation is required in any configuration, reducing design complexity and bill-of-materials cost.
Does the LTC3630IMSE#PBF require external compensation components?
No, the LTC3630IMSE#PBF uses a hysteretic Burst Mode® control architecture with internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies layout, improves stability across input/output variations, and removes tuning iterations. Only input and output capacitors, an inductor, and optional ISET/FBO/SS components are required for full functionality.
LTC3630IMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3630IMSE#PBF FAQ
1.How can I place an order for LTC3630IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630IMSE#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 LTC3630IMSE#PBF reliable?
The price and inventory of LTC3630IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630IMSE#PBF?
LTC3630IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630IMSE#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 LTC3630IMSE#PBF?
For technical support, including LTC3630IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630IMSE#PBF requirements.
6.How does Aetrix verify that LTC3630IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630IMSE#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 LTC3630IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630IMSE#PBF?
All LTC3630IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630IMSE#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 LTC3630IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3630IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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