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Analog Devices Inc. LT8613IUDE#TRPBF
- Part No.:
- LT8613IUDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8613IUDE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,197
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Product details
Overview
LT8613IUDE#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 ±9% power-good flag accuracy. It operates from 3.4V to 42V input, delivers up to 6A output current, and supports adjustable switching frequency from 200kHz to 2.2MHz - used in automotive infotainment power rails and industrial PLC I/O modules.
For engineers reviewing the LT8613IUDE#TRPBF datasheet, LT8613IUDE#TRPBF pinout, LT8613IUDE#TRPBF application, or LT8613IUDE#TRPBF equivalent, key selection criteria include ultralow IQ regulation at 12VIN→3.3VOUT, rail-to-rail ISP/ISN current sensing capability, low dropout (250mV @ 3A), internal compensation for fast transient response, and thermal performance enabled by its exposed-pad 3mm × 6mm QFN package.
Technical Context
The LT8613IUDE#TRPBF implements peak current mode control with internal compensation, enabling stable operation with small inductors and fast load transient recovery. Its 40ns minimum on-time supports high VIN/VOUT ratios (e.g., 42V→3.3V) without requiring external frequency foldback mitigation.
Built-in current sense amplifier provides bidirectional monitoring via ISP/ISN inputs and proportional analog output on IMON (20× VISP–VISN), while ICTRL allows programmable current limit threshold down to 4mV. The device supports both Burst Mode (3µA IQ) and pulse-skipping modes, with SYNC pin enabling external clock synchronization or DC-high activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24V/36V rails without pre-regulation. |
| Output Current | 6A continuous - enables single-chip power for FPGA core rails or multi-sensor subsystems. |
| Quiescent Current | 3µA in Burst Mode - extends battery life in always-on telematics and ECU sleep modes. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows optimization between EMI filtering size and efficiency. |
| Feedback Reference | 0.970V ±0.006V - enables precise output voltage setting with 1% resistors and low divider current. |
| Power-Good Accuracy | ±9% window around VFB - ensures reliable system reset sequencing and fault detection. |
| Min On-Time | 40ns - supports 42V→3.3V conversion at 700kHz without duty-cycle limitation. |
| Current Sense Range | 4mV to 52mV (ICTRL-adjustable) - accommodates high-side, low-side, or output-current monitoring with 10mΩ–100mΩ sense resistors. |
Pinout & Package
LT8613IUDE#TRPBF is housed in a thermally enhanced 28-lead 3mm × 6mm plastic QFN package (UDE) with exposed pad (Pin 29) soldered to PCB ground for θJC(PAD) = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (5,6,7) | Input Power Supply | Supplies internal circuitry and top switch; must be locally bypassed with low-ESR capacitor near PGND. |
| PGND (8,9,10) | Power Ground Return | Return path for bottom switch; requires low-inductance connection to input capacitor negative terminal. |
| GND (11–14,29) | Analog & Thermal Ground | Exposed pad (Pin 29) must be soldered to PCB GND plane for thermal dissipation and noise immunity. |
| SW (15–19) | Switch Node | Connects to inductor and BST capacitor; must be minimized in area to reduce EMI and ringing. |
| BST (20) | Bootstrap Drive | Requires 0.1µF ceramic capacitor to SW for top NMOS gate drive above VIN. |
| INTVCC (21) | Internal 3.4V Regulator Output | Bypass with ≥1µF ceramic; supplies internal logic; draws current from BIAS if VBIAS > 3.1V. |
| BIAS (22) | Efficiency-Optimized Bias Supply | Connect to VOUT ≥3.3V to reduce VIN current draw and improve light-load efficiency. |
| PG (23) | Open-Drain Power-Good Flag | Pulls low when VOUT deviates >±9% from regulation or during fault; valid above 3.4V VIN. |
| FB (24) | Feedback Input | Regulated to 0.970V; connects to resistor divider; phase-lead cap (4.7–10pF) recommended. |
| ISP/ISN (25,26) | Differential Current Sense Inputs | Rail-to-rail capable; monitor high-side, low-side, or output current with external sense resistor. |
| IMON (27) | Proportional Monitor Output | Sources V = 20×(VISP–VISN); usable for analog current readback or overcurrent protection. |
| ICTRL (28) | Current Limit Threshold Control | Adjusts ISP–ISN full-scale threshold from 4mV to 52mV; float or tie to INTVCC for 50mV default. |
| SYNC (1) | External Clock Interface | Enable synchronization (200kHz–2.2MHz), pulse-skipping mode, or Burst Mode (tie low). |
| TR/SS (2) | Soft-Start & Tracking Control | Capacitor sets output ramp rate; voltage <0.97V forces FB tracking; pulled low during fault. |
| RT (3) | Frequency Programming | Resistor to GND sets switching frequency per RT = 46.5/fSW – 5.2 (kΩ, fSW in MHz). |
| EN/UV (4) | Enable & Input UVLO | 1.00V rising threshold with 40mV hysteresis; programs VIN undervoltage lockout or shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 3µA IQ in Burst Mode enables >10-year battery life in always-on automotive modules. |
| Integrated Current Sense Amplifier | Eliminates external op-amp and gain resistors; supports rail-to-rail ISP/ISN common-mode range (0–42V). |
| Programmable Current Limit | ICTRL pin adjusts ISP–ISN threshold from 4mV to 52mV - enables precise overcurrent protection across load ranges. |
| Low-Ripple Burst Mode | Maintains <10mVP-P output ripple at light loads while sustaining 3µA input current - critical for noise-sensitive ADCs. |
| Thermally Optimized Package | 3mm × 6mm QFN with exposed GND pad achieves θJC(PAD) = 5°C/W - supports 6A continuous in compact layouts. |
| Internal Compensation | Reduces external component count; enables stable loop response with 1.5µH–4.7µH inductors and fast transient recovery. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering SoC cores and DDR memory in head-unit systems with cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator with current monitoring for short-circuit detection and thermal derating. Use Value: 40ns min on-time sustains regulation during 42V→3.3V conversion; 3µA IQ extends battery backup runtime during ignition-off. |
Use Scenario: Generating isolated 5V/12V rails for digital I/O, analog sensor interfaces, and CAN transceivers in modular controllers. IC Role / Device Role / Timing Role: High-efficiency, current-monitored DC/DC stage feeding downstream LDOs and isolated DC/DC converters. Use Value: ISP/ISN sensing enables real-time channel current monitoring; ±9% PG flag validates rail integrity before firmware initialization. |
| CCCV Battery Charger Front-End | Medical Point-of-Care Instrument |
|
Use Scenario: Constant-current/constant-voltage pre-regulator for Li-ion charging circuits in portable defibrillators and infusion pumps. IC Role / Device Role / Timing Role: Adjustable current-limited buck stage controlling charge current via ICTRL-modulated ISP–ISN threshold. Use Value: Programmable 4–52mV current sense range supports 100mA–6A charge profiles with single-component scaling. |
Use Scenario: Powering low-noise analog front-ends (AFE), precision ADCs, and microcontrollers in handheld diagnostics devices. IC Role / Device Role / Timing Role: Low-ripple, low-IQ power source with soft-start (TR/SS) to prevent inrush-induced sensor offset drift. Use Value: <10mVP-P ripple in Burst Mode avoids ADC quantization noise; IMON output feeds MCU for real-time power health monitoring. |
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 |
|---|---|---|---|
| LT8640SIV#PBF | Higher 8A output current, 2.2MHz max frequency, but 4.5µA IQ and no integrated current sense amplifier. | Lacks rail-to-rail ISP/ISN monitoring; requires external current sense IC for closed-loop current control. | Select when higher output current and faster switching are prioritized over integrated current sensing and lowest IQ. |
| TPS546B24RVFT | 6A PMBus-enabled buck with 2.5µA IQ, but only 17V max input and no programmable current limit via ICTRL. | Supports digital telemetry and margining, but unsuitable for 42V automotive transients or analog current threshold tuning. | Select when digital interface, telemetry, and tight output voltage tolerance (±0.5%) outweigh 42V input and analog current control needs. |
Compared with LT8640SIVIV#PBF and TPS546B24RVFT, the LT8613IUDE#TRPBF uniquely combines 42V input rating, integrated rail-to-rail current sense amplifier, and 3µA IQ - making it optimal for space-constrained, high-reliability analog current-monitoring applications where digital control is unnecessary.
Availability
LT8613IUDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O, CCCV battery charger front-ends, and medical point-of-care instruments requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8613IUDE#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 LT8613IUDE#TRPBF belongs to Analog Devices' Silent Switcher® family of high-efficiency, low-EMI DC/DC regulators designed for noise-sensitive and power-constrained applications in automotive and industrial environments.
FAQ
What is the guaranteed operating junction temperature range for the LT8613IUDE#TRPBF?
The LT8613IUDE#TRPBF is specified for –40°C to 125°C junction temperature operation. This "I" grade variant is guaranteed across the full range per characterization and statistical process controls, unlike the "E" grade which is only guaranteed from 0°C to 125°C. The exposed pad (Pin 29) must be soldered to PCB ground to achieve thermal resistance θJC(PAD) = 5°C/W and sustain 6A continuous current within this range.
How does the LT8613IUDE#TRPBF achieve 3µA quiescent current, and under what conditions is it measured?
The LT8613IUDE#TRPBF achieves 3µA quiescent current in Burst Mode operation with SYNC pin tied low, VIN = 12V, VOUT = 3.3V, and zero load. This value includes internal regulator leakage and feedback divider current - so actual system IQ depends on FB resistor values. For example, using R1 = 1MΩ and R2 = 412kΩ adds ~0.8µA reflected input current, resulting in ~2.5µA total at 12V input.
Can the LT8613IUDE#TRPBF be synchronized to an external clock, and what are the voltage requirements for the SYNC pin?
Yes, the LT8613IUDE#TRPBF supports external clock synchronization via the SYNC pin (Pin 1). SYNC accepts TTL- or CMOS-compatible logic levels: falling threshold is 0.7V, rising threshold is 1.0V, and maximum input voltage is 6V. When driven by an external clock (200kHz–2.2MHz), the device operates in pulse-skipping mode with aligned switching edges and disables frequency foldback - ideal for EMI reduction in noise-sensitive systems.
What is the function of the ICTRL pin on the LT8613IUDE#TRPBF, and how does it affect current limiting?
The ICTRL pin (Pin 28) on the LT8613IUDE#TRPBF adjusts the full-scale ISP–ISN differential voltage threshold used for peak current limiting. With ICTRL floating or tied to INTVCC, the default threshold is 50mV. Applying 0–1V to ICTRL scales the threshold linearly from 4mV to 52mV, enabling precise tuning of overcurrent protection without changing the sense resistor - critical for applications requiring multiple current limits or dynamic derating.
Does the LT8613IUDE#TRPBF require external compensation components, and what topology does it use?
No, the LT8613IUDE#TRPBF uses internal compensation with peak current mode control, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, and ensures stable loop response with standard 1.5µH–4.7µH inductors. The architecture delivers fast transient response and inherent cycle-by-cycle current limiting - verified across –40°C to 125°C operation without recalibration.
LT8613IUDE#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)
LT8613IUDE#TRPBF FAQ
1.How can I place an order for LT8613IUDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8613IUDE#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 LT8613IUDE#TRPBF reliable?
The price and inventory of LT8613IUDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8613IUDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8613IUDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8613IUDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8613IUDE#TRPBF?
LT8613IUDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8613IUDE#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 LT8613IUDE#TRPBF?
For technical support, including LT8613IUDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8613IUDE#TRPBF requirements.
6.How does Aetrix verify that LT8613IUDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8613IUDE#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 LT8613IUDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8613IUDE#TRPBF?
All LT8613IUDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8613IUDE#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 LT8613IUDE#TRPBF part is unused and in its original packaging.
Return procedure for LT8613IUDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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