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Analog Devices Inc. LT8613EUDE#TRPBF
- Part No.:
- LT8613EUDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8613EUDE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,304
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Product details
Overview
LT8613EUDE#TRPBF from Analog Devices is a 42V, 6A synchronous step-down regulator with integrated current sense amplifier, 3µA quiescent current in Burst Mode, 40ns minimum on-time, and internal compensation. It delivers regulated 5V/6A output in automotive and industrial power supplies where ultra-low IQ, low EMI, and wide input range (3.4V–42V) are critical.
For engineers reviewing the LT8613EUDE#TRPBF datasheet, LT8613EUDE#TRPBF pinout, LT8613EUDE#TRPBF application, or LT8613EUDE#TRPBF equivalent, this page provides verified package mapping (28-lead 3mm × 6mm QFN), confirmed current-sense functionality (ISP/ISN/IMON/ICTRL), validated thermal performance (θJA = 40°C/W), and real-world efficiency data at 3.3V/5V outputs across load and temperature.
Technical Context
The LT8613EUDE#TRPBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation using small inductors (e.g., 3.9µH). Its 40ns minimum on-time supports high VIN/VOUT ratios (e.g., 42V→5V), while frequency foldback during start-up or overload prevents inductor current runaway.
Built-in rail-to-rail current sense inputs (ISP/ISN) feed a proportional monitor (IMON = 20×(VISP−VISN)) and programmable current limit via ICTRL (adjustable 5–50mV sense threshold). The EN/UV pin features 1V accurate threshold with 40mV hysteresis, and PG flag signals ±9% VOUT regulation and fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports 12V/24V/36V automotive and industrial rails without pre-regulation |
| Output Current | 6A continuous - enables single-chip 5V/6A or 3.3V/6A conversion for FPGA, SoC, or sensor subsystems |
| Quiescent Current | 3µA at 12VIN→3.3VOUT - extends battery life in always-on systems (e.g., telematics, ADAS sensors) |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor; 700kHz typical with 60.4kΩ for optimal size/efficiency trade-off |
| Current Sense Accuracy | ±2% VISP−VISN threshold - enables precise input/output current limiting and monitoring for CCCV charging |
| Thermal Resistance | θJA = 40°C/W, θJC(PAD) = 5°C/W - exposed pad soldering required for reliable 6A operation at 125°C junction |
| Minimum On-Time | 40ns - allows high step-down ratios (e.g., 42V→5V at 700kHz) without pulse-skipping instability |
Pinout & Package
LT8613EUDE#TRPBF is housed in a thermally enhanced 28-lead 3mm × 6mm plastic QFN package with exposed GND pad (Pin 29), requiring PCB soldering for thermal integrity and low θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock synchronization input | Enables external frequency alignment or disables frequency foldback when DC-high; must not be floated |
| TR/SS (2) | Soft-start and output tracking control | Capacitor-programmed voltage ramp rate; forces FB regulation to TR/SS voltage below 0.97V |
| RT (3) | Switching frequency programming | Resistor-to-GND sets fSW from 200kHz–2.2MHz; 60.4kΩ yields 700kHz typical |
| EN/UV (4) | Enable and input undervoltage lockout | 1.00V rising threshold with 40mV hysteresis; programs VIN UVLO via resistor divider |
| VIN (5–7) | Main power input for IC logic and top switch | Must be tied together and locally bypassed; place input cap positive terminal near these pins |
| PGND (8–10) | Power ground return for bottom switch | Low-inductance path for switch current; negative input cap terminal must connect here |
| GND (11–14) | Analog ground and thermal pad connection | Connect to PCB GND plane; exposed pad (Pin 29) is GND and must be soldered |
| SW (15–19) | Switch node output | High-frequency switching node; tie all SW pins together and minimize PCB trace area |
| BST (20) | Bootstrap capacitor connection | 0.1µF ceramic cap required between BST and SW for top NMOS gate drive |
| INTVCC (21) | Internal 3.4V regulator bypass | Decouple with ≥1µF ceramic cap to PGND; supplies internal drivers and control circuits |
| BIAS (22) | Efficiency-optimized bias supply | Tie to VOUT ≥3.3V to reduce VIN current draw; improves light-load efficiency |
| PG (23) | Power good open-drain flag | Pulls low if VFB deviates >±9% or fault occurs; valid when VIN >3.4V regardless of EN/UV state |
| FB (24) | Feedback reference input | Regulated to 0.970V ±0.5%; connect resistor divider tap and 4.7–10pF phase-lead cap |
| ISP (25) | Current sense non-inverting input | Rail-to-rail input for sensing high-side, low-side, or output current with external sense resistor |
| ISN (26) | Current sense inverting input | Paired with ISP; differential voltage (VISP−VISN) sets current limit and IMON output |
| IMON (27) | Proportional current monitor output | Sources VIMON = 20×(VISP−VISN); 200µA source/10µA sink capability for system-level current telemetry |
| ICTRL (28) | Current limit adjustment | Modulates ISP-ISN threshold from 5mV to 50mV; float or tie to INTVCC for default 50mV limit |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3µA IQ in Burst Mode enables >10-year battery life in always-on 12V automotive modules |
| Integrated current sense amplifier | Eliminates external op-amp and gain resistors; supports bidirectional current monitoring via ISP/ISN |
| Programmable current limit | ICTRL pin adjusts ISP-ISN threshold from 5mV to 50mV, enabling precise overcurrent protection for diverse loads |
| Low EMI Silent Switcher® architecture | Controlled SW node rise/fall times and symmetrical layout reduce radiated emissions without shielding |
| Robust thermal design | Exposed pad (Pin 29) and low θJC(PAD) = 5°C/W allow full 6A operation at 125°C junction temperature |
| Flexible frequency synchronization | SYNC pin accepts external clocks (200kHz–2.2MHz) or DC logic levels to enable pulse-skipping or Burst Mode |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 5V/3A display controller and audio codec in head unit with 12V battery input subject to cold-crank (4.5V) and load-dump (42V). IC Role / Device Role / Timing Role: Primary 42V-input synchronous buck regulator with current sense for input current limiting and thermal derating. Use Value: 3µA IQ prevents battery drain during vehicle sleep; 40ns min-on-time ensures regulation during cold-crank; PG flag validates safe power-up before MCU initialization. | Use Scenario: Generating isolated 3.3V/2A supply for microcontroller and CAN transceiver in DIN-rail mounted PLC with 24VDC field bus. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with BIAS pin tied to VOUT to minimize VIN current and improve partial-load efficiency. Use Value: 94% efficiency at 3.3V/3A from 12V input reduces thermal stress in sealed enclosure; IMON pin enables real-time current telemetry for predictive maintenance. |
| CCCV Battery Charger Front-End | Medical Sensor Hub Power |
Use Scenario: Constant-current/constant-voltage stage for Li-ion pack charging in portable defibrillator, accepting 18–36V DC input. IC Role / Device Role / Timing Role: Input current regulator using ISP/ISN sense and ICTRL to enforce precise charge current limit independent of battery voltage. Use Value: Rail-to-rail ISP/ISN inputs support high-side current sensing; IMON output feeds ADC for closed-loop CC control; ±2% sense accuracy ensures <±1% charge current tolerance. | Use Scenario: Ultra-low-noise 3.3V/500mA supply for analog front-end (AFE) and low-power MCU in wearable ECG monitor powered by coin cell + boost converter. IC Role / Device Role / Timing Role: Secondary buck regulator operating in Burst Mode to maintain 3.3V output while drawing only 3µA from intermediate 5V rail. Use Value: Output ripple <10mVP-P avoids AFE interference; TR/SS soft-start prevents inrush into sensitive analog circuitry; EN/UV enables MCU-controlled power sequencing. |
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#TRPBF | Same package and pinout; adds spread-spectrum modulation for lower EMI; identical electrical specs except fSW range extended to 3MHz | Preferred for medical or EMC-sensitive applications where radiated emissions must meet CISPR-22 Class B | Select LT8614EUDE#TRPBF when EMI reduction is prioritized over cost; no PCB changes required |
| LM5164QPWPRQ1 | 42V, 1A buck with 14µA IQ; smaller 16-pin HTSSOP; no integrated current sense amplifier or IMON output | Suitable for lower-current auxiliary rails (e.g., 3.3V/500mA MCU core) where current monitoring is unnecessary | Choose LM5164QPWPRQ1 for cost-sensitive, space-constrained designs with ≤1A load and no current telemetry requirement |
Compared with LT8614EUDE#TRPBF, the LT8613EUDE#TRPBF offers identical power delivery but lacks spread-spectrum EMI reduction; compared with LM5164QPWPRQ1, it delivers 6× higher output current and integrated current sensing-critical for battery charging and industrial monitoring where precision current control is mandatory.
Availability
LT8613EUDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and CCCV battery charger front-ends requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LT8613EUDE#TRPBF 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#TRPBF belongs to the Silent Switcher® monolithic buck regulator product line, designed specifically for noise-sensitive and battery-powered applications demanding ultralow quiescent current, wide input voltage range, and integrated current sensing.
FAQ
What is the guaranteed operating temperature range for the LT8613EUDE#TRPBF?
The LT8613EUDE#TRPBF is specified for operation from –40°C to 125°C junction temperature. This grade (E-grade) is assured by design, characterization, and statistical process controls across the full range, making it suitable for under-hood automotive and industrial environments where ambient temperatures exceed 85°C.
How does the LT8613EUDE#TRPBF achieve 3µA quiescent current?
The LT8613EUDE#TRPBF achieves 3µA quiescent current through optimized Burst Mode® operation: during light loads, it delivers discrete energy pulses to the output capacitor and enters deep sleep between bursts, shutting down all switching and control circuitry. This reduces input current to 1.7µA in sleep mode, yielding ~3µA total at no load with minimal feedback divider current.
Can the LT8613EUDE#TRPBF be synchronized to an external clock, and what are the voltage requirements?
Yes, the LT8613EUDE#TRPBF can be synchronized to an external clock via the SYNC pin (Pin 1). The SYNC pin accepts logic-level inputs with falling threshold of 0.7V and rising threshold of 1.0V. For reliable synchronization, apply a clean square wave between 200kHz and 2.2MHz; DC-high (≥3V) disables frequency foldback and enables pulse-skipping mode.
What is the function of the ICTRL pin on the LT8613EUDE#TRPBF, and how is it used?
On the LT8613EUDE#TRPBF, the ICTRL pin (Pin 28) adjusts the ISP-ISN current sense threshold from 5mV to 50mV. Tying ICTRL to GND sets 5mV limit for high-precision current control; floating or connecting to INTVCC selects the default 50mV limit. An internal 1.4µA pull-up ensures defined behavior when unused.
Is the LT8613EUDE#TRPBF pin-compatible with other devices in the LT861x family?
Yes, the LT8613EUDE#TRPBF shares identical pinout and package (28-lead 3mm × 6mm QFN) with LT8614EUDE#TRPBF and LT8613IUDE#TRPBF. However, functional differences exist: LT8614 adds spread-spectrum modulation, and the 'I' grade offers extended characterization over –40°C to 125°C. No PCB redesign is needed for drop-in replacement within the same grade.
LT8613EUDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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#TRPBF FAQ
1.How can I place an order for LT8613EUDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8613EUDE#TRPBF 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#TRPBF reliable?
The price and inventory of LT8613EUDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8613EUDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8613EUDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8613EUDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8613EUDE#TRPBF?
LT8613EUDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8613EUDE#TRPBF 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#TRPBF?
For technical support, including LT8613EUDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8613EUDE#TRPBF requirements.
6.How does Aetrix verify that LT8613EUDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8613EUDE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8613EUDE#TRPBF?
All LT8613EUDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8613EUDE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT8613EUDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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