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Analog Devices Inc. LT8630IFE#PBF
- Part No.:
- LT8630IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Datasheet:
-
LT8630IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:544
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Product details
Overview
LT8630IFE#PBF from Analog Devices is a monolithic, current-mode synchronous step-down DC/DC regulator delivering up to 0.6A output current with 3V–100V input range, 0.8V–60V programmable output, and boundary mode switching for high efficiency across wide load and input conditions. It integrates top/bottom MOSFETs, supports Burst Mode® operation (16µA IQ at 12VIN→5VOUT), and features power good flag, soft-start/tracking, and programmable UVLO - used in telecom power supplies and industrial distributed regulation.
For engineers reviewing the LT8630IFE#PBF datasheet, LT8630IFE#PBF pinout, LT8630IFE#PBF application, or LT8630IFE#PBF equivalent, key selection criteria include ultra-wide VIN tolerance (100V max), internal synchronous switches, 7.5% PG threshold accuracy, 0.808V feedback reference, and thermal-enhanced 20-lead TSSOP package with exposed GND pad.
Technical Context
The LT8630IFE#PBF employs variable-frequency boundary mode control to minimize switching losses across input voltages from 3V to 100V and loads from zero to 0.6A. Its peak-current-mode architecture uses an internal 0.808V reference and transconductance error amplifier driving a VC node that sets per-cycle peak inductor current.
Burst Mode® operation activates below ~100mA load, reducing quiescent current to 16µA (12VIN→5VOUT) while maintaining <5mV output ripple; shutdown draws <5µA. The device tolerates open/short faults on EN/UV, TR/SS, and RT pins and includes overtemperature protection with thermal shutdown above 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 100V - enables direct regulation from automotive battery, 48V/72V telecom rails, or unregulated industrial supplies without pre-regulation. |
| Output Current | 0.6A maximum continuous - guaranteed at VIN ≥ 10V, VOUT = 5V, L = 15µH; derates at higher VIN due to thermal limits. |
| Feedback Reference | 0.808V ±12mV - sets precise output voltage via external resistor divider; enables 0.8V–60V programmability with <±1% regulation error over line/load/temp. |
| Quiescent Current | 16µA at 12VIN→5VOUT in Burst Mode - sustains >90% efficiency down to 100µA load while minimizing standby power in always-on systems. |
| Power Good Threshold | ±7.5% of VFBREF - provides accurate output voltage monitoring with 1.9% hysteresis; drives open-drain PG pin low during undervoltage/overvoltage fault. |
| Switching Architecture | Boundary mode - eliminates hard-switching losses by turning on top switch at zero-current crossing of discontinuous ring, maximizing efficiency at light-to-moderate loads. |
| Package Thermal Resistance | θJC(PAD) = 10°C/W - exposed GND pad soldered to PCB copper enables reliable 0.6A operation at TJ ≤ 125°C ambient with minimal heatsinking. |
Pinout & Package
The LT8630IFE#PBF is housed in a thermally enhanced 20-lead plastic TSSOP (FE package) with exposed GND pad (Pin 21), rated for –40°C to +125°C operating junction temperature. High-voltage lead spacing ensures creepage/clearance compliance for 100V applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main power input and top switch drain | Accepts 3V–100V; powers internal circuitry and connects directly to high-side MOSFET drain - requires local 2.2µF ceramic decoupling. |
| EN/UV (3) | Enable and UVLO programming input | Active-high enable with 1.19V threshold; external resistor divider sets custom UVLO point - pulls <100nA, enabling low-power sequencing. |
| PG (5) | Open-drain power good flag | Sinks current when VOUT deviates >±7.5% from regulation - signals system controller of valid output voltage with 1.9% hysteresis. |
| RT (8) | Frequency setting reference | Connects to GND via 8.66kΩ resistor to set internal oscillator frequency - determines minimum off-time and boundary mode behavior. |
| TR/SS (10) | Soft-start and tracking control | Sinks 4.5µA typical during startup - controls VOUT ramp rate via external capacitor; also accepts external voltage for output tracking. |
| FB (11) | Error amplifier inverting input | Regulated to 0.808V - forms feedback loop with external resistor divider to set output voltage; bias current <25nA minimizes divider loading. |
| VOUT (12) | Output sense and current sensing node | Connects to output capacitor and inductor - senses output voltage and inductor current via internal RSENSE; must be routed with low-inductance path. |
| IND (14) | Inductor current sense input | Inputs inductor current signal to internal current comparator - used for cycle-by-cycle peak current limiting and boundary detection. |
| INTVCC (16) | Internal 3V regulator bypass | Bypassed with 2.2µF ceramic capacitor - supplies internal analog/digital circuitry; not intended for external loading. |
| BST (18) | Bootstrap drive for top switch | Requires 0.1µF capacitor to SW - generates gate drive voltage >VIN for high-side MOSFET; BST-SW voltage must exceed 2.4V to sustain conduction. |
| SW (20) | Switch node output | Drives external inductor - carries high dI/dt switching current; must be kept short with minimal loop area to reduce EMI and voltage spikes. |
| GND (21) | Primary ground reference | Exposed pad - sole ground connection for power and signal paths; must be soldered to large PCB copper pour for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-wide input range | 3V–100V operation eliminates need for pre-regulators in automotive, industrial, and telecom systems with varying supply conditions. |
| Internal synchronous switches | Integrated 775mΩ top / 550mΩ bottom MOSFETs reduce external component count and improve efficiency vs. external diode solutions. |
| Burst Mode® with low ripple | 16µA IQ at 12VIN→5VOUT and <5mV output ripple enables battery-powered or energy-harvesting applications requiring long standby life. |
| Programmable undervoltage lockout | EN/UV pin allows user-defined start-up voltage threshold using two resistors - supports brown-in/out protection and power sequencing. |
| Flexible soft-start and tracking | TR/SS pin provides linear VOUT ramp control and external voltage tracking capability - prevents inrush current and enables multi-rail sequencing. |
| High-voltage TSSOP package | 20-lead TSSOP with extended creepage spacing and exposed GND pad meets safety requirements for 100V applications while enabling compact layout. |
Applications
| Telecom Power Supply | Distributed Industrial Regulation |
|---|---|
Use Scenario: Regulating 48V or 72V telecom backplane to 12V/5V for line cards and interface modules. IC Role / Device Role / Timing Role: Primary non-isolated buck converter providing stable, efficient, and fault-tolerant intermediate bus voltage. Use Value: 95% peak efficiency at 48VIN→12VOUT/0.6A and 16µA no-load IQ extend system uptime and reduce cooling requirements in dense chassis. | Use Scenario: Powering PLC I/O modules, sensors, and actuators from unregulated 24V–100V industrial field buses. IC Role / Device Role / Timing Role: Point-of-load regulator delivering isolated or non-isolated 3.3V/5V with robust input transient handling. Use Value: 100V absolute max rating and programmable UVLO tolerate harsh industrial transients; PG flag enables real-time health monitoring. |
| Automotive Body Control | Test & Measurement Equipment |
Use Scenario: Converting 12V/24V battery rail to 5V/3.3V for microcontrollers, CAN transceivers, and display drivers in body electronics. IC Role / Device Role / Timing Role: High-reliability buck regulator supporting cold-crank (3V) and load-dump (100V) conditions without external protection. Use Value: Boundary mode efficiency >85% at 3V–5V input and Burst Mode IQ <20µA extend battery life in always-on modules like door controllers. | Use Scenario: Providing clean, low-noise 5V/12V rails for ADCs, DACs, and precision op-amps in portable bench instruments. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source with tight output regulation and fast transient response. Use Value: <5mV output ripple in Burst Mode and ±7.5% PG accuracy ensure measurement integrity; soft-start prevents digital logic glitches during power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3639EMSE#PBF | Lower VIN max (60V), higher IQ (25µA), fixed 3.3V/5V options only; no PG flag or tracking. | Best for cost-sensitive, lower-input-voltage applications where programmability and fault signaling are secondary. | Select LTC3639EMSE#PBF only if input never exceeds 60V and PG/soft-start features are unnecessary. |
| MAX20004AATP+T | 60V max VIN, integrated compensation, 2.2MHz fixed frequency, no Burst Mode - IQ = 28µA at light load. | Suitable for space-constrained designs needing high-frequency operation and simplified layout, but sacrifices ultra-low IQ and wide-VIN flexibility. | Choose MAX20004AATP+T when board area is critical and 60V input ceiling is acceptable; avoid for 72V/100V telecom or automotive use. |
Compared with LTC3639EMSE#PBF and MAX20004AATP+T, the LT8630IFE#PBF uniquely combines 100V input tolerance, 16µA Burst Mode IQ, programmable PG and UVLO, and boundary mode efficiency - making it the only option for high-reliability, wide-input, low-quiescent-power buck regulation.
Availability
LT8630IFE#PBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial distributed regulation, and automotive body control systems requiring stable component supply with guaranteed long-term availability and full temperature-grade compliance.
Supply support for LT8630IFE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8630IFE#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC regulators, designed specifically for ultra-wide-input-voltage applications demanding low quiescent current, high reliability, and robust fault protection in harsh environments.
FAQ
What is the maximum input voltage rating for the LT8630IFE#PBF?
The LT8630IFE#PBF has an absolute maximum input voltage rating of 100V on the VIN pin, with guaranteed operation across 3V to 100V. This enables direct regulation from automotive battery systems (including cold-crank and load-dump transients), 48V/72V telecom supplies, and unregulated industrial rails without external protection circuitry. Operation beyond 100V risks permanent damage per Absolute Maximum Ratings.
Does the LT8630IFE#PBF support output voltage tracking during power-up?
Yes, the LT8630IFE#PBF supports output voltage tracking via the TR/SS pin. When an external voltage ramp is applied to TR/SS, the FB pin regulates to match that voltage until it reaches the programmed output level - enabling coordinated startup with other rails. The internal 4.5µA current sink also allows linear soft-start using a single capacitor, preventing inrush current and ensuring controlled VOUT ramping.
What is the typical quiescent current of the LT8630IFE#PBF in Burst Mode operation?
The LT8630IFE#PBF draws 16µA typical quiescent current from VIN when regulating 5V output from a 12V input in Burst Mode, and 7µA at 48VIN→5VOUT. This ultra-low IQ enables >90% efficiency down to 100µA load and extends battery life in always-on systems. Shutdown mode further reduces current to <5µA when EN/UV is pulled below 1.18V.
How does the LT8630IFE#PBF implement power good signaling?
The LT8630IFE#PBF provides power good signaling through its open-drain PG pin, which sinks current when the FB voltage deviates more than ±7.5% from the 0.808V reference. The comparators include 1.9% hysteresis to prevent chatter during marginal conditions. PG remains high-impedance when regulation is valid, allowing pull-up to any compatible logic voltage (≤100V) for system-level monitoring and sequencing.
What package type and thermal characteristics does the LT8630IFE#PBF use?
The LT8630IFE#PBF uses a 20-lead plastic TSSOP (FE package) with exposed GND pad (Pin 21). Its thermal resistance is θJC(PAD) = 10°C/W and θJA = 40°C/W. The exposed pad must be soldered to a large PCB copper area to achieve rated 0.6A output current at TJ ≤ 125°C. This package supports high-voltage creepage spacing required for 100V applications.
LT8630IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width), 16 Leads, Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 600mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8630IFE#PBF FAQ
1.How can I place an order for LT8630IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8630IFE#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 LT8630IFE#PBF reliable?
The price and inventory of LT8630IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8630IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8630IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8630IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8630IFE#PBF?
LT8630IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8630IFE#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 LT8630IFE#PBF?
For technical support, including LT8630IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8630IFE#PBF requirements.
6.How does Aetrix verify that LT8630IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8630IFE#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 LT8630IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8630IFE#PBF?
All LT8630IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8630IFE#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 LT8630IFE#PBF part is unused and in its original packaging.
Return procedure for LT8630IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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