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Analog Devices Inc. LTC3630EMSE#PBF
- Part No.:
- LTC3630EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads, Exposed Pad
- Datasheet:
-
LTC3630EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:831
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Product details
Overview
LTC3630EMSE#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, 12µA no-load quiescent current, and programmable peak current limit (100mA–1.2A). It enables robust power conversion in battery-powered industrial sensors and avionics power rails.
For engineers reviewing the LTC3630EMSE#PBF datasheet, LTC3630EMSE#PBF pinout, LTC3630EMSE#PBF application, or LTC3630EMSE#PBF equivalent, key selection considerations include its wide 4V–65V input range, 0.8V ±1% feedback reference, Burst Mode® operation for ultra-low IQ, 100% duty-cycle dropout capability, and parallelable FBO pin for higher-current designs.
Technical Context
The LTC3630EMSE#PBF implements a hysteretic Burst Mode® control architecture with internal 0.8V feedback reference and programmable peak current comparator threshold set via ISET pin resistor. Its dual-MOSFET synchronous topology eliminates external diode losses and supports continuous conduction mode at heavy loads and discontinuous mode at light loads.
Startup is managed by a precise RUN pin comparator (1.21V rising threshold, 110mV hysteresis) and configurable soft-start via SS pin capacitor or internal 0.8ms timer. The FBO pin provides open-drain feedback comparator output enabling master-slave paralleling of multiple LTC3630EMSE#PBF units for >500mA total output current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 65V - supports direct regulation from 12V, 24V, 48V industrial buses and 60V automotive transients. |
| Max Output Current | 500mA - average output limited to half the programmable peak current (e.g., 1.0A peak → 500mA avg). |
| Quiescent Current | 12µA typical in Burst Mode® sleep - enables multi-year battery life in always-on remote sensors. |
| Feedback Reference | 0.8V ±1% - enables precise adjustable output down to 0.8V or fixed 1.8V/3.3V/5V via VPRG pins. |
| Peak Current Range | 100mA to 1.2A - set by resistor from ISET to GND; determines inductor size, ripple, and efficiency trade-offs. |
| Dropout Operation | 100% duty cycle - maintains regulation even when VIN ≈ VOUT, critical for brownout resilience. |
| Switch On-Resistance | Top: 1.0Ω, Bottom: 0.53Ω - low RDS(on) minimizes conduction loss across full load range. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE16), 3mm × 4.9mm, exposed pad (Pin 17) tied to GND for thermal performance. θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connects to inductor; carries pulsed current through internal high-side and low-side MOSFETs. |
| VIN (3) | Main input supply | Accepts 4V–65V; requires local ceramic bypass to GND for stability and EMI suppression. |
| RUN (5) | Enable/control input | 1.21V rising threshold enables operation; <0.7V forces 5µA shutdown; supports UVLO via resistor divider. |
| VPRG1/VPRG2 (6,7) | Output voltage select | Ground/SS combinations configure fixed 1.8V, 3.3V, 5V or adjustable output without external resistors. |
| GND (8,14,16,17) | Ground reference | Multiple ground pins + exposed thermal pad (Pin 17) must be soldered to PCB ground plane. |
| VFB (9) | Feedback input | Compares divided output to 0.8V reference; directly connected to VOUT in fixed-output mode. |
| SS (10) | Soft-start control | Capacitor to GND sets ramp time (1ms per 16.5nF); floating defaults to 0.8ms internal timer. |
| ISET (11) | Peak current programming | Resistor to GND sets peak current (100mA–1.2A); also accepts CISET capacitor to reduce light-load ripple. |
| FBO (12) | Feedback comparator output | Open-drain output (20µA pull-up, 70Ω pull-down) enables paralleling multiple LTC3630EMSE#PBF units. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces no-load IQ to 12µA while maintaining regulation - essential for energy-harvesting and battery longevity. |
| Integrated dual MOSFETs | Eliminates external diode and gate drivers; reduces BOM count and layout area in space-constrained modules. |
| Programmable peak current | Adjusts switching behavior and component sizing via single ISET resistor - optimizes efficiency vs. ripple vs. size. |
| Parallelable FBO pin | Enables coherent current sharing across ≥2 LTC3630EMSE#PBF units without external clock synchronization. |
| 100% duty-cycle dropout | Maintains regulation as VIN drops to VOUT level - prevents system reset during input sags in automotive/industrial systems. |
Applications
| Industrial Control Supplies | Avionics Power Rails |
|---|---|
Use Scenario: Regulating 24V or 28V aircraft bus to 3.3V for flight control microcontrollers and sensor interfaces. IC Role / Device Role / Timing Role: Primary point-of-load regulator with high-voltage transient tolerance and low-noise output. Use Value: Withstands 65V input surges and delivers 500mA at 3.3V with <12µA quiescent draw - extends backup battery runtime during emergency modes. |
Use Scenario: Powering fault-tolerant data acquisition modules in unmanned aerial vehicles (UAVs) operating from 12V–48V battery packs. IC Role / Device Role / Timing Role: Synchronous buck controller managing dynamic load steps from telemetry bursts and actuator pulses. Use Value: Burst Mode® ensures stable 5V output under 100µA sleep loads while supporting 500mA peak during sensor sampling - no external LDO required. |
| Portable Medical Instruments | Battery-Operated Remote Sensors |
Use Scenario: Converting two Li-ion cells (6V–8.4V) to regulated 1.8V for low-power ADCs and wireless transceivers in handheld diagnostics. IC Role / Device Role / Timing Role: High-efficiency step-down converter with precision 0.8V reference enabling accurate voltage scaling. Use Value: Adjustable output down to 0.8V ±1% and 100% duty-cycle operation preserve battery capacity during deep discharge - extends clinical device runtime. |
Use Scenario: Supplying 3.3V to LoRaWAN edge nodes powered by primary lithium thionyl chloride (LiSOCl₂) batteries with 3.6V nominal voltage. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter sustaining 10-year shelf life and intermittent 500mA transmit bursts. Use Value: 12µA no-load IQ and programmable peak current minimize self-discharge - enables >10-year field deployment without maintenance. |
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 |
|---|---|---|---|
| LT8609SIMSE#PBF | Lower 3.0V–42V input range; 2.5A output; 2.5µA IQ; requires external compensation. | Better suited for higher-current, lower-input applications where footprint allows larger inductor. | Select if >500mA output or sub-4V start-up is required; not drop-in due to different pinout and compensation needs. |
| TPS54360DGQR | 4.5V–60V input; 3.5A output; 146µA IQ; requires external MOSFETs and compensation network. | Targeted at cost-sensitive industrial supplies where external FETs enable thermal flexibility. | Choose when higher output current and design-in flexibility outweigh integration and ultra-low IQ benefits of LTC3630EMSE#PBF. |
Compared with LT8609SIMSE#PBF and TPS54360DGQR, the LTC3630EMSE#PBF uniquely combines 65V input rating, integrated MOSFETs, 12µA IQ, and programmable peak current in a compact MSOP package - making it optimal for space- and energy-constrained 500mA applications where input can exceed 42V.
Availability
LTC3630EMSE#PBF is available at Aetrix Electronics and suitable for industrial control supplies, avionics power rails, and portable medical instruments requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3630EMSE#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, datasheets, and application engineering for legacy Linear parts including the LTC3630 series.
The LTC3630EMSE#PBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for ruggedized power conversion in automotive, aerospace, and industrial environments where wide VIN, low IQ, and reliability are mandatory.
FAQ
What is the maximum input voltage the LTC3630EMSE#PBF can withstand continuously?
The LTC3630EMSE#PBF has an absolute maximum VIN rating of 70V, but its specified operating input voltage range is 4V to 65V. Continuous operation above 65V violates the datasheet's operational limits and may impair reliability. Transient overvoltage events up to 70V are tolerated briefly, provided they remain within the Absolute Maximum Ratings duration limits defined in Note 1 of the datasheet. For sustained 65V+ operation, derating or external clamping is recommended.
How does the ISET pin on the LTC3630EMSE#PBF affect output current and efficiency?
The ISET pin on the LTC3630EMSE#PBF sets the peak inductor current via an external resistor to GND, directly determining the maximum average output current (half the peak value). A 220kΩ resistor yields ~500mA max output; lowering resistance increases peak current and output capability but raises switching losses. Adding a capacitor from ISET to GND reduces light-load output ripple at the expense of reduced efficiency due to increased ISET current consumption during sleep mode.
Can the LTC3630EMSE#PBF be used in parallel configurations, and how is current sharing achieved?
Yes, the LTC3630EMSE#PBF supports parallel operation using its FBO (feedback comparator output) pin. Connecting the FBO of one "master" LTC3630EMSE#PBF to the VFB pins of "slave" units forces all devices to regulate to the same feedback threshold, enabling passive current sharing. No external clock or current-sense circuitry is required. Layout symmetry and matched inductor values are critical to ensure balanced loading across paralleled LTC3630EMSE#PBF units.
What is the purpose of the exposed pad (Pin 17) on the LTC3630EMSE#PBF MSE16 package?
The exposed pad (Pin 17) on the LTC3630EMSE#PBF MSE16 package is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJA of 45°C/W and prevent thermal shutdown under full load. Omitting thermal vias or insufficient pad area increases junction temperature, degrading efficiency and lifetime. The datasheet explicitly states this pad "MUST BE SOLDERED TO PCB" - floating or unconnected pads violate thermal design requirements.
Does the LTC3630EMSE#PBF support fixed-output voltages without external resistors?
Yes, the LTC3630EMSE#PBF supports factory-configurable fixed outputs of 1.8V, 3.3V, or 5V using only the VPRG1 and VPRG2 pins - no external feedback resistors needed. Shorting VPRG1 and VPRG2 to SS selects 1.8V; VPRG1 to SS and VPRG2 to GND selects 3.3V; VPRG1 to GND and VPRG2 to SS selects 5V. This simplifies BOM and improves noise immunity compared to resistor-divider-based adjustable configurations.
LTC3630EMSE#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
LTC3630EMSE#PBF FAQ
1.How can I place an order for LTC3630EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3630EMSE#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 LTC3630EMSE#PBF reliable?
The price and inventory of LTC3630EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3630EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3630EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3630EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3630EMSE#PBF?
LTC3630EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3630EMSE#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 LTC3630EMSE#PBF?
For technical support, including LTC3630EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3630EMSE#PBF requirements.
6.How does Aetrix verify that LTC3630EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3630EMSE#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 LTC3630EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3630EMSE#PBF?
All LTC3630EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3630EMSE#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 LTC3630EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3630EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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