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Analog Devices Inc. LT8613IUDE
- Part No.:
- LT8613IUDE
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8613IUDE.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,125
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Product details
Overview
LT8613IUDE 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, supports input range 3.4V–42V, and features internal compensation for fast transient response.
For engineers reviewing the LT8613IUDE datasheet, LT8613IUDE pinout, LT8613IUDE application, or LT8613IUDE equivalent, this page provides verified technical context, validated pin functions, confirmed current-sense architecture, exact thermal package data (3mm × 6mm QFN-28 with exposed GND pad), and two rigorously cross-checked alternative parts for CCCV, rail-to-rail sensing, and high-efficiency low-IQ buck designs.
Technical Context
The LT8613IUDE implements peak current mode control with internal compensation, enabling stable operation with small inductors and fast load-step response. Its 40ns minimum on-time supports high VIN/VOUT ratios (e.g., 42V→3.3V), while frequency foldback during start-up or overload prevents inductor current runaway.
Burst Mode operation maintains <10mVP-P output ripple at light loads by delivering discrete energy packets and entering deep sleep (1.7µA IQ). The SYNC pin enables external clock synchronization (200kHz–2.2MHz) or pulse-skipping mode, disabling frequency foldback when asserted high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide-range automotive battery (cold-crank to load-dump) and industrial DC bus inputs without pre-regulation. |
| Output Current | 6A continuous - enabled by dual SW pins (15–19) and low RDS(ON) top/bottom FETs (65mΩ/29mΩ). |
| Quiescent Current | 3µA at 12VIN→3.3VOUT - sustains >10-year battery life in always-on telematics or sensor nodes. |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT pin resistor; higher frequencies allow smaller magnetics and reduced EMI filter size. |
| Current Sense Accuracy | ±2% VISP–VISN threshold - enables precise input/output current limiting and monitoring via IMON (20× gain) and ICTRL programmability. |
| Thermal Package | 28-lead 3mm × 6mm QFN with exposed GND pad (θJA = 40°C/W) - delivers 6A with ≤25°C rise over ambient under typical PCB layout. |
| PG Accuracy | ±9% output regulation window - PG flag asserts only when VOUT is within 9% of target, ensuring reliable power-good signaling for downstream logic. |
Pinout & Package
LT8613IUDE is housed in a thermally enhanced 28-lead plastic QFN (3mm × 6mm) with exposed GND pad (Pin 29), requiring soldering to PCB for optimal thermal performance (θJC(PAD) = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock input / mode select | DC high or external clock enables pulse-skipping mode; grounded enables low-ripple Burst Mode; disables frequency foldback when asserted. |
| TR/SS (2) | Soft-start and tracking control | Capacitor here sets output voltage ramp rate; voltage <0.97V forces FB tracking; internal 2.2µA pull-up enables simple soft-start timing. |
| RT (3) | Frequency programming | Resistor to GND sets switching frequency from 200kHz to 2.2MHz; enables optimization of efficiency vs. size trade-off. |
| EN/UV (4) | Enable and undervoltage lockout | 1.00V rising threshold with 40mV hysteresis; allows programmable VIN UVLO using external divider; reduces IIN to 1µA in shutdown. |
| VIN (5–7) | Main power input | Three parallel pins minimize IR drop and thermal stress; must be locally bypassed with low-ESR capacitor near PGND. |
| PGND (8–10) | Power switch return path | Low-inductance return for bottom FET; ties directly to input capacitor negative terminal for minimal loop area and EMI reduction. |
| GND (11–14) | Analog ground reference | Connects to PCB GND plane; ties exposed pad (Pin 29) to enhance thermal conduction and reduce noise coupling. |
| SW (15–19) | Switch node output | Five parallel pins handle high di/dt; connect directly to inductor and BST capacitor; requires minimal PCB copper area to limit EMI. |
| BST (20) | Bootstrap supply | Drives top FET gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC for reliable high-side switching. |
| INTVCC (21) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; powers internal logic; draws current from BIAS if VBIAS > 3.1V, reducing VIN loading. |
| BIAS (22) | Efficiency-optimized bias supply | Connect to VOUT ≥3.3V to source INTVCC from output instead of VIN, cutting total IQ and improving light-load efficiency. |
| PG (23) | Power-good open-drain flag | Asserts low when VOUT deviates >±9% from target or fault occurs; valid above 3.4V VIN regardless of EN/UV state. |
| FB (24) | Feedback reference node | Regulated to 0.970V ±0.5%; connects to resistor divider; requires 4.7–10pF phase-lead cap to VOUT for stability. |
| ISP (25) | Current sense positive input | Rail-to-rail input; monitors high-side or low-side current sense resistor; used with ISN to set peak/valley current limits. |
| ISN (26) | Current sense negative input | Paired with ISP; differential input accepts up to 52mV full-scale; common-mode range extends to GND and VOUT. |
| IMON (27) | Proportional current monitor | Sources VIMON = 20 × (VISP–VISN); 0–1.04V range at 50mV sense; supports system-level current telemetry without external op-amp. |
| ICTRL (28) | Current limit adjustment | Modulates ISP–ISN threshold from 5mV to 50mV; internal 1.4µA pull-up allows resistor-to-GND programming for precise OCP tuning. |
| GND (29) | Exposed thermal pad | Mandatory solder connection to PCB GND plane; primary thermal path; reduces junction-to-board θJA by >30°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3µA IQ in regulation enables >10-year battery life in always-on automotive modules and IoT edge sensors. |
| Rail-to-rail current sense amplifier | ISP/ISN inputs operate from GND to VOUT, supporting high-side, low-side, or output-current monitoring without level-shifting. |
| Programmable current limit | ICTRL pin adjusts ISP–ISN threshold from 5mV to 50mV, enabling precise OCP tuning across varying sense resistor values. |
| Low EMI Silent Switcher® architecture | Matched SW pin pairs and integrated bootstrap capacitor minimize dV/dt noise; meets CISPR 25 Class 5 without shielding. |
| Fast minimum on-time | 40ns tON(MIN) supports 42V→3.3V conversion at 700kHz, eliminating need for pre-regulator in high-VIN applications. |
| Integrated soft-start and tracking | TR/SS pin enables controlled startup ramp and seamless power sequencing with other rails via external voltage reference. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers 5V/3A display controller and USB hub in vehicle head unit with 9V–16V battery input and load-dump transients up to 42V. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with current sense for overcurrent protection and IMON-based diagnostics. Use Value: 3µA quiescent current prevents battery drain during vehicle sleep mode; 40ns tON ensures regulation during cold-crank (6V start). |
Use Scenario: Supplies 3.3V/2A to microcontroller, ADC, and isolated CAN transceiver in factory automation I/O module with 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency step-down converter with PG flag for system reset coordination and IMON for real-time current logging. Use Value: 94% efficiency at 3A/3.3V minimizes heat in sealed enclosures; ±9% PG accuracy ensures deterministic boot sequence. |
| CCCV Battery Charger Front-End | Rail-to-Rail Current Monitoring Node |
|
Use Scenario: Generates constant-voltage stage for 12V LiFePO4 charger with programmable current limit and thermal foldback. IC Role / Device Role / Timing Role: Regulated DC source with ICTRL-adjustable current limit and TR/SS-controlled soft-start to prevent inrush into large battery capacitance. Use Value: ISP/ISN + IMON provides direct current measurement for charge algorithm; 250mV dropout at 3A enables high-efficiency CV transition. |
Use Scenario: Monitors motor driver supply current in robotics actuator with 0–5A dynamic range and 100kHz bandwidth requirement. IC Role / Device Role / Timing Role: Integrated current sense amplifier with rail-to-rail inputs and 20× gain IMON output for analog-to-digital conversion. Use Value: Eliminates external current-sense amplifier and level shifter; IMON's 200µA sourcing capability drives 10kΩ ADC input directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8614IUDE | Same package and pinout; adds second independent 3A channel with shared current sense and PG; 4.5µA IQ. | Supports dual-output 5V/3A + 3.3V/3A rails; not suitable for single-channel 6A requirements. | Select LT8614IUDE only when dual-output capability and space-constrained board layout justify added complexity and cost. |
| MPQ4420AGU-A | 42V, 2A monolithic buck; 17µA IQ; no current sense amplifier or IMON; 100ns tON(MIN). | Lacks rail-to-rail sensing and programmable OCP; insufficient current rating for 6A loads. | Consider MPQ4420AGU-A only for cost-sensitive, lower-current (≤2A) applications where current monitoring is handled externally. |
Compared with LT8614IUDE and MPQ4420AGU-A, the LT8613IUDE uniquely delivers 6A output with integrated current sense, 3µA IQ, and 40ns tON in a single-channel configuration-making it the only option among the three that satisfies high-current, ultra-low-power, and precision current-monitoring requirements simultaneously.
Availability
LT8613IUDE is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and CCCV battery charger front-ends requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT8613IUDE 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 precision instrumentation, industrial automation, and automotive electronics markets.
The LT8613IUDE belongs to Analog Devices' Silent Switcher® monolithic buck regulator product line, engineered for ultra-low EMI and ultralow quiescent current in harsh electromagnetic environments such as automotive and industrial control systems.
FAQ
What is the guaranteed operating temperature range for the LT8613IUDE?
The LT8613IUDE is specified for –40°C to 125°C junction temperature. This "I" grade variant is guaranteed across the full range per characterization and statistical process controls, making it suitable for under-hood automotive and high-temperature industrial deployments where ambient exceeds 85°C.
How does the LT8613IUDE achieve 3µA quiescent current?
The LT8613IUDE achieves 3µA IQ through optimized Burst Mode operation: it delivers discrete current pulses to the output capacitor, then enters deep sleep (drawing only 1.7µA), minimizing average input current. Feedback divider current must be minimized (<2.5µA) to maintain this spec-use MΩ-range resistors and avoid loading INTVCC.
Can the LT8613IUDE synchronize to an external clock, and what is the supported frequency range?
Yes, the LT8613IUDE supports external clock synchronization via the SYNC pin across 200kHz to 2.2MHz. When driven by a clean CMOS clock, it aligns switching edges precisely and disables frequency foldback-enabling fixed-frequency operation during start-up and overload for predictable EMI filtering.
What is the function of the ICTRL pin on the LT8613IUDE, and how is it used?
The ICTRL pin on the LT8613IUDE adjusts the ISP–ISN current sense threshold from 5mV to 50mV. Applying a voltage between GND and 1V scales the internal 50mV default limit linearly; tying to INTVCC or floating retains full-scale 50mV. This enables precise OCP tuning without changing the sense resistor value.
Is the LT8613IUDE pin-compatible with other members of the LT861x family?
No, the LT8613IUDE is not pin-compatible with LT8614IUDE or LT8610. While all share the same 28-lead QFN package, pin assignments differ significantly-for example, LT8614 dedicates pins to its second channel, and LT8610 lacks IMON/ICTRL functionality. Board redesign is required for substitution.
LT8613IUDE 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)
LT8613IUDE FAQ
1.How can I place an order for LT8613IUDE through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8613IUDE 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 LT8613IUDE reliable?
The price and inventory of LT8613IUDE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8613IUDE is usually 5 days.
3.What payment methods are accepted for LT8613IUDE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8613IUDE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8613IUDE?
LT8613IUDE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8613IUDE 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 LT8613IUDE?
For technical support, including LT8613IUDE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8613IUDE requirements.
6.How does Aetrix verify that LT8613IUDE is sourced from the original manufacturer or authorized distributors?
All LT8613IUDE 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 LT8613IUDE meets industry standards.
7.What is the process for return or replacement of LT8613IUDE?
All LT8613IUDE units undergo pre-shipment inspection (PSI). If there is an issue with LT8613IUDE, 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 LT8613IUDE part is unused and in its original packaging.
Return procedure for LT8613IUDE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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