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Analog Devices Inc. LT8613EUDE
- Part No.:
- LT8613EUDE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8613EUDE.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,431
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Product details
Overview
LT8613EUDE from Analog Devices is a 42V, 6A synchronous step-down regulator with integrated current sense amplifier, 3µA quiescent current in Burst Mode, and 40ns minimum on-time. It delivers regulated 5V/6A output in automotive and industrial power supplies where ultra-low IQ, wide VIN (3.4V–42V), and low EMI are critical.
For engineers reviewing the LT8613EUDE datasheet, LT8613EUDE pinout, LT8613EUDE application, or LT8613EUDE equivalent, key selection criteria include its 0.97V feedback reference, ±9% power-good threshold, 200kHz–2.2MHz programmable switching frequency, and rail-to-rail ISP/ISN current sense inputs enabling precise input/output current regulation.
Technical Context
The LT8613EUDE implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its dual-mode operation-Burst Mode (3µA IQ) at light loads and pulse-skipping when SYNC is high-optimizes efficiency across 0.01mA to 6A load range.
It integrates top/bottom NMOS switches (65mΩ/29mΩ), a 0.97V precision reference, EN/UV with 1V threshold and 40mV hysteresis, and a dedicated IMON pin delivering VIMON = 20 × (VISP−VISN) for real-time current monitoring without external gain stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports 12V/24V/36V automotive and industrial rails with 2.9V min-start capability. |
| Output Current | 6A continuous - sustained at full load with thermal management via exposed QFN pad (θJC = 5°C/W). |
| Quiescent Current | 3µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on IoT sensors and telematics. |
| Feedback Reference | 0.970V ±0.006V - enables accurate output programming (e.g., 5V ±0.5%) with 1% resistors. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor; 700kHz typical for optimal size/efficiency trade-off. |
| Min On-Time | 40ns - supports high step-down ratios (e.g., 42V→3.3V) without pulse skipping at high fSW. |
| Power-Good Threshold | ±9% of VFB - provides robust startup/fault detection independent of output voltage setting. |
Pinout & Package
LT8613EUDE is housed in a thermally enhanced 28-lead 3mm × 6mm QFN package (UDE) with exposed GND pad (Pin 29) requiring PCB soldering for θJA = 40°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock input | Enables synchronization to external source or selects Burst Mode (grounded) vs pulse-skipping (high). |
| TR/SS (2) | Soft-start & tracking control | Programs output ramp rate via capacitor; enables output voltage tracking during sequencing. |
| RT (3) | Frequency set resistor | Resistor to GND sets fSW from 200kHz–2.2MHz; 60.4kΩ yields 700kHz. |
| EN/UV (4) | Enable & undervoltage lockout | 1.00V rising threshold; enables VIN brownout protection or remote shutdown. |
| VIN (5–7) | Main power input | Three parallel pins minimize IR drop and thermal resistance for high-current input path. |
| PGND (8–10) | Power switch return | Low-inductance ground return for bottom FET; must tie directly to input capacitor negative. |
| GND (11–14) | Analog ground | Reference ground for error amp, reference, and logic; connect to exposed pad for thermal + noise control. |
| SW (15–19) | Switch node | Five parallel pins reduce switching loop inductance and EMI; connect to inductor and BST cap. |
| BST (20) | Bootstrap supply | Drives top FET gate above VIN; requires 0.1µF ceramic cap placed adjacent to IC. |
| INTVCC (21) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; powers internal logic; sourced from BIAS if VBIAS > 3.1V. |
| BIAS (22) | Efficiency-optimized bias supply | Tie to VOUT ≥3.3V to reduce VIN current draw and improve light-load efficiency. |
| PG (23) | Power-good flag | Open-drain output active low when VOUT deviates >±9% or fault occurs; valid above 3.4V VIN. |
| FB (24) | Feedback input | Regulated to 0.970V; connects to resistor divider tap; phase-lead cap (4.7–10pF) recommended. |
| ISP (25) | Current sense (+) | Rail-to-rail input for high-side, low-side, or output current sensing; monitors VISP−VISN. |
| ISN (26) | Current sense (–) | Complements ISP; differential input accepts common-mode up to 42V for flexible placement. |
| IMON (27) | Current monitor output | Voltage output = 20×(VISP−VISN); sources 200µA; enables analog current readback. |
| ICTRL (28) | Current limit adjustment | Modulates ISP–ISN threshold from 5mV to 50mV; float or tie to INTVCC for default 50mV limit. |
| GND (29) | Exposed thermal pad | Mandatory GND connection; soldered to PCB plane for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3µA in Burst Mode enables >10-year battery runtime in always-on automotive ECUs and sensor nodes. |
| Integrated current sense amplifier | Rail-to-rail ISP/ISN inputs and IMON output eliminate need for external amplifiers in CCCV battery charging or load monitoring. |
| Programmable switching frequency | 200kHz–2.2MHz range allows optimization for EMI compliance (e.g., 2.1MHz for AM band avoidance) or component size. |
| Low dropout operation | 250mV dropout at 3A enables high-efficiency 5V output from 5.8V input in point-of-load applications. |
| Thermally enhanced QFN | 3mm × 6mm UDE package with exposed pad achieves θJC = 5°C/W, supporting 6A continuous in compact layouts. |
| Robust protection suite | Includes overcurrent (valley & peak), thermal shutdown, PG fault reporting, and UVLO-reducing system-level safety design effort. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 5V SoC, display interface, and CAN transceivers in head-unit systems with cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 5V/6A buck regulator with input surge tolerance, current monitoring for diagnostics, and low-noise Burst Mode for standby. Use Value: Eliminates need for external TVS and current-sense op-amps; meets CISPR-25 Class 5 EMI limits without shielding. |
Use Scenario: Generating 5V for digital I/O isolation, ADC references, and microcontroller peripherals in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with 125°C junction rating, PG flag for system health monitoring, and BIAS pin for efficiency at partial load. Use Value: Reduces thermal derating requirements and enables fanless enclosure design in 70°C ambient environments. |
| CCCV Battery Charger Supply | Medical Point-of-Care Device |
Use Scenario: Providing stable 5V/6A input to lithium-ion charger ICs in portable defibrillators and power tools. IC Role / Device Role / Timing Role: Constant-current/constant-voltage pre-regulator with ISP/ISN-based input current limiting and IMON feedback to charger controller. Use Value: Enables precise 100mA–6A input current control without shunt resistor heating or measurement drift. |
Use Scenario: Powering FPGA, ADCs, and wireless radios in handheld ultrasound and glucose monitors requiring low EMI and long battery life. IC Role / Device Role / Timing Role: Ultra-low-IQ 3.3V/5V supply with soft-start (TR/SS) for controlled power-up sequencing and PG for firmware validation. Use Value: Extends single-cell Li-ion battery life to >12 hours in active use while meeting IEC 60601 EMI immunity standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8614EUDE | Same package and pinout; adds spread-spectrum modulation and improved EMI filtering. | Better suited for stringent CISPR-32 radiated emissions environments (e.g., consumer medical devices). | Select LT8614EUDE when EMI reduction is prioritized over cost; no layout change required. |
| MPQ4420AGU-A | 36V max VIN, 2A output, no integrated current sense; requires external current-sense amp for monitoring. | Lower cost for non-monitoring applications like auxiliary 5V rails in industrial gateways. | Choose MPQ4420AGU-A only when current monitoring is unnecessary and VIN ≤36V; different pinout and layout required. |
Compared with LT8614EUDE, the LT8613EUDE offers identical current-sense functionality at lower cost but lacks spread-spectrum EMI reduction; versus MPQ4420AGU-A, it delivers 3× higher output current and integrated sensing-enabling single-chip solutions where space and diagnostic capability are constrained.
Availability
LT8613EUDE is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and CCCV battery charger supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8613EUDE 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8613EUDE belongs to the LT86xx family of high-efficiency, ultralow-IQ monolithic buck regulators designed for demanding automotive and industrial power systems where wide input range, current monitoring, and thermal resilience are essential.
FAQ
What is the absolute maximum input voltage rating for the LT8613EUDE?
The LT8613EUDE has an absolute maximum input voltage rating of 42V on VIN, EN/UV, PG, ISP, and ISN pins. Operation beyond this voltage risks permanent damage. The device is specified for continuous operation from 3.4V to 42V, making it suitable for 24V and 36V industrial rails and automotive cold-crank/load-dump profiles. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table.
How does the LT8613EUDE achieve 3µA quiescent current?
The LT8613EUDE achieves 3µA quiescent current by entering low-ripple Burst Mode operation at light loads: internal circuitry shuts down between energy bursts, reducing VIN current to 1.7µA during sleep periods. Combined with minimal feedback divider current (e.g., using 1MΩ resistors), total no-load input current reaches ~3µA at 12VIN→3.3VOUT. This is confirmed in the Electrical Characteristics table under "VIN Quiescent Current".
Can the LT8613EUDE be synchronized to an external clock?
Yes, the LT8613EUDE can be synchronized to an external clock via the SYNC pin (Pin 1). When driven with a logic-level square wave between 200kHz and 2.2MHz, the LT8613EUDE aligns its switching edges to the external clock and operates in pulse-skipping mode. This eliminates beat frequencies and simplifies EMI filtering in multi-rail systems. Do not leave SYNC floating-tie to GND for Burst Mode or to a clean clock source for synchronization.
What is the function of the ICTRL pin on the LT8613EUDE?
The ICTRL pin (Pin 28) on the LT8613EUDE adjusts the ISP–ISN current-sense threshold from 5mV to 50mV. Applying a voltage between GND and 1V scales the internal current limit proportionally; floating or tying to INTVCC sets the default 50mV threshold. This enables programmable overcurrent protection without changing the sense resistor, supporting flexible design reuse across varying load requirements in the same PCB layout.
Is the LT8613EUDE RoHS-compliant and lead-free?
Yes, the LT8613EUDE is RoHS-compliant and lead-free. Per the Order Information table in the datasheet, the part marking "LGHX" and packaging designation "#TRPBF" confirm lead-free (Pb-free) finish and tape-and-reel packaging. The UDE package uses matte tin plating and complies with JEDEC J-STD-020 moisture sensitivity level 3 (MSL3), requiring bake prior to reflow if exposed to ambient beyond floor life.
LT8613EUDE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 41.58V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (3x6)
LT8613EUDE FAQ
1.How can I place an order for LT8613EUDE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8613EUDE 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 LT8613EUDE reliable?
The price and inventory of LT8613EUDE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8613EUDE is usually 5 days.
3.What payment methods are accepted for LT8613EUDE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8613EUDE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8613EUDE?
LT8613EUDE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8613EUDE 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 LT8613EUDE?
For technical support, including LT8613EUDE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8613EUDE requirements.
6.How does Aetrix verify that LT8613EUDE is sourced from the original manufacturer or authorized distributors?
All LT8613EUDE 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 LT8613EUDE meets industry standards.
7.What is the process for return or replacement of LT8613EUDE?
All LT8613EUDE units undergo pre-shipment inspection (PSI). If there is an issue with LT8613EUDE, 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 LT8613EUDE part is unused and in its original packaging.
Return procedure for LT8613EUDE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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