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Analog Devices Inc. LT8613IUDE#PBF
- Part No.:
- LT8613IUDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8613IUDE#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
LT8613IUDE#PBF 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 accuracy. It delivers regulated 5V/6A output in automotive and industrial power supplies where low-noise, high-efficiency operation across wide input (3.4V–42V) and light-load conditions is critical.
For engineers reviewing the LT8613IUDE#PBF datasheet, LT8613IUDE#PBF pinout, LT8613IUDE#PBF application, or LT8613IUDE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed current-sense architecture, real-world efficiency curves at 3.3V/5V outputs, and authoritative alternative selection guidance for high-reliability DC/DC design.
Technical Context
The LT8613IUDE#PBF implements peak current-mode control with internal compensation, enabling fast transient response and stable loop behavior using small inductors. Its 200kHz–2.2MHz programmable switching frequency (via RT resistor) supports EMI-sensitive layouts while maintaining regulation down to 100µA load.
It integrates rail-to-rail ISP/ISN current sense inputs with 20× gain IMON monitor output and ICTRL-adjustable current limit (5mV–52mV range), allowing precise input/output current regulation or limiting. The device features ultralow 3µA IQ in Burst Mode, 1V EN/UV threshold with 40mV hysteresis, and PG flag signaling ±9% VOUT tolerance 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 with margin for transients. |
| Output Current | 6A continuous - enables single-chip 5V/6A or 3.3V/6A conversion without external MOSFETs. |
| Quiescent Current | 3µA at 12VIN→3.3VOUT - sustains >1000-hour battery runtime in always-on systems. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows optimization of size vs. efficiency vs. EMI. |
| Current Sense Accuracy | ±5% ISP–ISN voltage monitoring - enables accurate overcurrent protection and telemetry. |
| Power-Good Threshold | ±9% of 0.97V FB reference - ensures reliable system enable/disable sequencing. |
| Min On-Time | 40ns - supports high VIN/VOUT ratios (e.g., 42V→3.3V) without pulse-skipping instability. |
Pinout & Package
LT8613IUDE#PBF uses a thermally enhanced 28-lead 3mm × 6mm QFN package with exposed GND pad (Pin 29), θJC(PAD) = 5°C/W. The package requires soldering the exposed pad to PCB ground plane for thermal integrity and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (1) | External clock synchronization input | Enables pulse-skipping mode or external frequency lock; disables frequency foldback when asserted. |
| TR/SS (2) | Soft-start and tracking control | Programs output ramp rate via capacitor; forces FB regulation to TR/SS voltage below 0.97V. |
| RT (3) | Switching frequency programming | Resistor to GND sets fSW from 200kHz to 2.2MHz; 60.4kΩ yields 700kHz typical. |
| EN/UV (4) | Enable and input undervoltage lockout | 1.0V rising threshold with 40mV hysteresis; shuts down IC drawing only 1µA when low. |
| VIN (5–7) | Main input power supply | Supplies internal circuitry and top switch; must be locally bypassed with low-ESR capacitors. |
| PGND (8–10) | Power switch ground return | Low-inductance return path for bottom FET; connects directly to input capacitor negative terminal. |
| GND (11–14) | Analog ground reference | Connects to PCB ground plane; ties exposed pad (Pin 29) for thermal and noise control. |
| SW (15–19) | Switch node | High-frequency switching output; connects to inductor and BST capacitor; minimize trace area. |
| BST (20) | Bootstrap supply | Drives top FET gate above VIN; requires 0.1µF ceramic capacitor placed adjacent to IC. |
| INTVCC (21) | Internal 3.4V regulator output | Bypass with ≥1µF ceramic; powers control logic; sourced from BIAS if VBIAS > 3.1V. |
| BIAS (22) | Efficiency-optimized bias supply | When tied to VOUT ≥3.3V, reduces VIN current draw and improves light-load efficiency. |
| PG (23) | Power-good open-drain flag | Pulls low when VOUT deviates >±9% from 0.97V or during fault; valid above 3.4V VIN. |
| FB (24) | Feedback reference input | Regulated to 0.970V ±0.006V; connects to resistor divider; add 4.7–10pF phase-lead cap. |
| ISP (25) | Current sense positive input | Rail-to-rail input; monitors high-side or low-side sense resistor voltage drop (VISP–ISN). |
| ISN (26) | Current sense negative input | Paired with ISP; differential input accepts common-mode up to 42V; ±20µA bias current. |
| IMON (27) | Proportional current monitor | Outputs 20×(VISP–ISN); 0–1.04V range; sources 200µA; used for analog current telemetry. |
| ICTRL (28) | Current limit adjustment | Sets ISP–ISN threshold from 5mV to 52mV; float or tie to INTVCC for default 50mV limit. |
| GND (29) | Exposed thermal pad | Mandatory GND connection; soldered to PCB copper for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 3µA input current at no load preserves battery life in always-on automotive modules. |
| Integrated current sense amplifier | Eliminates external op-amp and gain resistors; supports bidirectional sensing and telemetry. |
| Adjustable current limit via ICTRL | Enables dynamic current limiting from 5mV to 52mV sense voltage without hardware change. |
| Low EMI Silent Switcher® architecture | Minimizes radiated emissions via symmetrical SW node layout and tight hot-loop control. |
| Thermally enhanced QFN package | 3mm × 6mm footprint with exposed pad achieves θJC(PAD) = 5°C/W for high-power density. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 5V/3A display controller and USB hub in head unit with 12V battery input subject to cold-crank (4.5V) and load-dump (42V) events. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with input UVLO, current limiting, and PG sequencing for downstream SoC enable. Use Value: 42V absolute max rating and 3.4V min VIN withstand cold-crank; 3µA IQ extends backup battery life during sleep mode. |
Use Scenario: Generating isolated 3.3V/2A supply for microcontroller and CAN transceiver in DIN-rail mounted PLC with 24V field bus. IC Role / Device Role / Timing Role: Main DC/DC converter with adjustable current limit to protect against shorted I/O channels. Use Value: ISP/ISN current monitoring enables real-time channel current telemetry; ±9% PG ensures safe MCU boot timing. |
| CCCV Battery Charger Front-End | Medical Point-of-Care Device |
Use Scenario: Providing constant-current (CC) and constant-voltage (CV) stages for Li-ion charging from 12V–36V input in portable equipment. IC Role / Device Role / Timing Role: Adjustable current-limit buck stage preceding linear charger IC; ICTRL modulates CC setpoint. Use Value: 50mV default ISP–ISN threshold supports 10mΩ sense resistor for 5A CC; IMON provides analog feedback to charger controller. |
Use Scenario: Powering low-noise analog front-end and ARM Cortex-M4 in handheld diagnostic tool with coin-cell backup. IC Role / Device Role / Timing Role: Primary 3.3V/1.5A regulator with Burst Mode for ultra-low standby consumption. Use Value: 3µA IQ enables >2-year shelf life on primary battery; low ripple (<10mVP-P) prevents ADC noise coupling. |
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, 2.2MHz max fSW, lower 2.5µA IQ, but no IMON/ICTRL pins. | Lacks integrated current monitoring; requires external circuitry for current telemetry or adjustable limit. | Choose when higher current and smaller passive size are prioritized over current sense flexibility. |
| MPQ4433AGL-AEC1-Z | Automotive-grade 3.5A buck, 3.5µA IQ, 3.2V–36V input, but fixed 0.8V reference and no ISP/ISN. | No current sense interface; limited to basic regulation without input/output current control. | Choose for cost-sensitive AEC-Q100-compliant designs where current monitoring is not required. |
Compared with LT8640SIVIV#PBF and MPQ4433AGL-AEC1-Z, the LT8613IUDE#PBF uniquely combines 6A capability, ultralow 3µA IQ, and full current-sense telemetry (ISP/ISN/IMON/ICTRL) in a compact QFN-making it optimal for space-constrained, battery-sensitive, and current-monitored systems where functional integration reduces BOM count and improves reliability.
Availability
LT8613IUDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power supplies, and medical point-of-care devices requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LT8613IUDE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive safety markets.
The LT8613IUDE#PBF belongs to the Silent Switcher® monolithic buck regulator product line, engineered for ultra-low EMI and ultralow quiescent current in harsh electrical environments such as automotive and industrial power systems.
FAQ
What is the operating temperature range for the LT8613IUDE#PBF?
The LT8613IUDE#PBF is rated for –40°C to +125°C junction temperature and is qualified for industrial and automotive applications. Its I-grade marking confirms full specification compliance across this range, including guaranteed performance for feedback reference voltage (0.958V–0.982V), EN/UV threshold (0.94V–1.06V), and current limit (7.5A–12.0A) under all conditions.
How does the LT8613IUDE#PBF achieve 3µA quiescent current?
The LT8613IUDE#PBF achieves 3µA IQ through patented Burst Mode® operation: during light loads, it delivers discrete energy packets to the output capacitor and enters deep sleep between bursts, powering down all non-essential circuitry. This is distinct from pulse-skipping mode (enabled via SYNC pin), which draws several hundred µA due to continuous oscillator operation.
Can the LT8613IUDE#PBF regulate output current as well as voltage?
Yes. The LT8613IUDE#PBF supports both voltage and current regulation via its dedicated ISP/ISN current sense inputs and ICTRL pin. By configuring ICTRL, the device adjusts its peak inductor current limit; combined with IMON monitoring, it enables closed-loop current control for CCCV charging or overcurrent protection without external components.
What is the purpose of the BIAS pin on the LT8613IUDE#PBF?
The BIAS pin on the LT8613IUDE#PBF allows sourcing internal regulator current from VOUT instead of VIN when VBIAS > 3.1V. For 3.3V or 5V outputs, tying BIAS to VOUT reduces VIN current draw and improves light-load efficiency by bypassing the internal charge pump, lowering total system power dissipation.
Does the LT8613IUDE#PBF require external compensation components?
No. The LT8613IUDE#PBF features fully internal compensation optimized for peak current-mode control. No external compensation network is needed-only standard input/output capacitors, inductor, feedback resistors, BST capacitor, and optional TR/SS soft-start capacitor are required for full operation.
LT8613IUDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8613IUDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8613IUDE#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 LT8613IUDE#PBF reliable?
The price and inventory of LT8613IUDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8613IUDE#PBF is usually 5 days.
3.What payment methods are accepted for LT8613IUDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8613IUDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8613IUDE#PBF?
LT8613IUDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8613IUDE#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 LT8613IUDE#PBF?
For technical support, including LT8613IUDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8613IUDE#PBF requirements.
6.How does Aetrix verify that LT8613IUDE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8613IUDE#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 LT8613IUDE#PBF meets industry standards.
7.What is the process for return or replacement of LT8613IUDE#PBF?
All LT8613IUDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8613IUDE#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 LT8613IUDE#PBF part is unused and in its original packaging.
Return procedure for LT8613IUDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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