My Inquiry
My Account
Analog Devices Inc. LT8614IUDC#TRPBF
- Part No.:
- LT8614IUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN, 18 Leads, Exposed Pad
- Datasheet:
-
LT8614IUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,233
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8614IUDC#TRPBF from Analog Devices is a 42V, 4A synchronous step-down Silent Switcher regulator in a 18-lead 3mm × 4mm QFN package. It delivers up to 96% efficiency at 1MHz (12VIN to 5VOUT), features 2.5µA quiescent current in regulation, 30ns minimum on-time, and ultralow EMI emissions-designed for automotive infotainment power rails requiring high VIN-to-VOUT conversion with minimal board space.
For engineers reviewing the LT8614IUDC#TRPBF datasheet, LT8614IUDC#TRPBF pinout, LT8614IUDC#TRPBF application, or LT8614IUDC#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, Burst Mode™ operation for µA-level light-load efficiency, integrated power switches, and compatibility with 200kHz–3MHz switching frequency programming via RT pin.
Technical Context
The LT8614IUDC#TRPBF employs peak current mode control with internal compensation and Silent Switcher® architecture-using symmetrical layout and integrated BST capacitor routing to suppress common-mode EMI. Its dual input pins (VIN1/VIN2) and dual ground paths (GND1/GND2) minimize high-di/dt loop area, while exposed SW pads (pins 21/22) reduce thermal resistance and improve EMI performance.
It supports three operating modes: Burst Mode™ (SYNC low), pulse-skipping (SYNC ≥3V), or external clock synchronization (SYNC driven). Frequency foldback activates during startup or overload to limit inductor current; the 0.97V feedback reference is trimmed to ±0.6% over temperature, and EN/UV threshold is fixed at 1.00V with 40mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients including cold-crank (≥4.5V) and load-dump (≤42V). |
| Output Current | 4A continuous - enables single-chip 5V/4A or 3.3V/4A supplies without external MOSFETs or heatsinking. |
| Quiescent Current | 2.5µA at no load, 12VIN→3.3VOUT - extends battery runtime in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Switching Frequency | 200kHz to 3MHz, programmable via RT resistor - allows optimization for size (high-freq) or efficiency (low-freq) without changing layout. |
| Output Ripple | <10mVP-P across 0–4A load - eliminates need for post-regulation LDOs in noise-sensitive analog/RF circuits. |
| Minimum On-Time | 30ns - enables 12V→1.2V conversion at 2MHz, supporting high-step-down ratios in compact designs. |
| Thermal Rating | –40°C to +125°C junction (I-grade) - qualified per AEC-Q100 Grade I for under-hood and dashboard applications. |
Pinout & Package
Package: 18-lead 3mm × 4mm plastic QFN (UDC), exposed SW pads (pins 21/22) soldered to PCB for thermal and EMI performance. Pins 5 and 12 omitted; top-side marking "LGGQ".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal regulator bias supply | Reduces IQ when tied to VOUT ≥3.3V; bypass with 1µF ceramic if sourced externally. |
| INTVCC (2) | Internal 3.4V supply rail | Power source for gate drivers and logic; decouple with ≥1µF low-ESR ceramic to GND. |
| BST (3) | Bootstrap capacitor node | Drives high-side NMOS gate; requires 0.1µF ceramic capacitor between BST and SW. |
| VIN1 (4), VIN2 (13) | Dual input power inputs | Split inputs reduce high-frequency input loop area; each requires dedicated 1µF local bypass. |
| GND1 (6,7), GND2 (10,11) | Power switch return paths | Separate ground returns for top/bottom FETs; must be tied together and connected to solid ground plane. |
| SW (8,9,21,22) | Switch node outputs | Connects to inductor and BST cap; exposed pads (21/22) must be soldered to SW copper for thermal/EMI integrity. |
| EN/UV (14) | Enable and undervoltage lockout | 1.00V rising threshold with 40mV hysteresis; resistor divider enables programmable VIN UVLO. |
| RT (15) | Frequency programming | Resistor to GND sets fSW from 200kHz (221kΩ) to 3MHz (18.2kΩ); tolerance directly impacts freq accuracy. |
| TR/SS (16) | Soft-start and tracking | 2.2µA internal pull-up enables capacitor-programmed ramp rate; also accepts external voltage for output tracking. |
| SYNC/MODE (17) | Mode selection and sync input | Ground = Burst Mode; ≥3V = pulse-skipping; external clock = synchronized operation. |
| GND (18) | Signal ground reference | System ground connection; tie to main ground plane with low-inductance path. |
| PG (19) | Power good open-drain output | Asserts high when FB is within ±9% of 0.97V and no fault; valid only when VIN >3.4V. |
| FB (20) | Feedback input | Regulates to 0.970V ±0.6%; connect resistive divider tap and 4.7–22pF phase-lead cap to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck regulators-meets CISPR 25 Class 5 limits without shielding or ferrites. |
| Ultralow 2.5µA quiescent current | Enables >10-year battery life in always-on automotive modules (e.g., CAN wake-up receivers, GPS trackers) at 3.3V/100µA load. |
| 30ns minimum on-time | Supports direct 24V→1.8V or 48V→3.3V conversion at 2MHz, eliminating intermediate stages and reducing BOM count. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with HTOL, TC, and ESD testing-suitable for front-end power in ADAS cameras and radar units. |
| Integrated power switches | 85mΩ top / 40mΩ bottom NMOS enable full 4A output in 12mm² footprint-no external FETs, drivers, or bootstrap diodes required. |
| Programmable soft-start & tracking | TR/SS pin enables controlled ramp-up and seamless power sequencing with other rails (e.g., FPGA core/I/O voltages). |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powering 5V/3A display interface and USB hub in head unit with 9–16V battery input and load-dump immunity. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 5V from unregulated automotive battery rail. Use Value: Silent Switcher® EMI suppression avoids interference with AM/FM radio reception; 2.5µA IQ extends standby time during ignition-off. |
Use Scenario: Generating 3.3V/2A for image sensor and ISP in forward-facing camera with ambient temperature up to 105°C. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC converter operating continuously in engine compartment. Use Value: AEC-Q100 Grade I rating ensures reliability; 30ns min on-time supports 12V→3.3V at 2MHz for compact filter design. |
| Industrial IoT Sensor Node | GSM Baseband Power Supply |
|
Use Scenario: Battery-powered wireless sensor node requiring 3.3V/100mA with 10-year shelf life and cold-temperature startup (–40°C). IC Role / Device Role / Timing Role: Ultra-low-IQ step-down regulator enabling long-term energy harvesting or coin-cell operation. Use Value: 2.5µA IQ at no load and 94% efficiency at 1mA load maximize usable battery capacity; wide VIN accommodates aging cells. |
Use Scenario: Powering GSM modem baseband IC (e.g., Quectel M95) requiring clean 3.8V/1.5A with fast transient response during RF transmission bursts. IC Role / Device Role / Timing Role: High-current, low-noise buck converter with <10mVP-P ripple to prevent RF desense. Use Value: Output ripple <10mVP-P eliminates need for post-LDO filtering; PG pin enables precise power sequencing with modem reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610IUDC#TRPBF | 2A output current, identical pinout and feature set except lower current limit and smaller top/bottom FETs (110mΩ/55mΩ). | Suitable for ≤2A loads; lacks margin for 4A peak GSM transmit currents or dual-display power. | Select LT8610IUDC#TRPBF only when load current is confirmed ≤2A and cost reduction is prioritized over headroom. |
| MPQ4433AGL-AEC1-Z | 3.5A rated, 3.8–60V input, but 17µA IQ in light-load mode and no Silent Switcher EMI suppression. | Requires external EMI filters to meet CISPR 25; higher IQ reduces battery life in always-on nodes. | Choose MPQ4433AGL-AEC1-Z only if input voltage exceeds 42V or AEC-Q100 compliance is needed without EMI constraints. |
Compared with LT8610IUDC#TRPBF and MPQ4433AGL-AEC1-Z, the LT8614IUDC#TRPBF uniquely combines 4A capability, 2.5µA IQ, and certified low-EMI performance in a single AEC-Q100-qualified package-making it optimal for space-constrained, noise-sensitive automotive and industrial power systems where efficiency, reliability, and EMC are co-prioritized.
Availability
LT8614IUDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, industrial IoT sensor nodes, and GSM baseband power supplies requiring stable component supply, AEC-Q100 compliance, and ultralow quiescent current.
Supply support for LT8614IUDC#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 automotive, industrial, communications, and healthcare markets.
The LT8614IUDC#TRPBF belongs to the Silent Switcher® step-down regulator product line, engineered specifically for automotive and industrial applications demanding ultra-low EMI, high efficiency across load range, and robust operation under harsh voltage transients.
FAQ
What is the maximum input voltage rating for the LT8614IUDC#TRPBF?
The LT8614IUDC#TRPBF has an absolute maximum input voltage rating of 42V across VIN1, VIN2, and EN/UV pins. Its operational input range is specified from 3.4V to 42V, making it suitable for 12V and 24V automotive systems-including load-dump conditions up to 42V. Exceeding 42V may cause permanent damage per Absolute Maximum Ratings.
Does the LT8614IUDC#TRPBF require external compensation components?
No, the LT8614IUDC#TRPBF features internal compensation and operates stably with standard output capacitor types (e.g., ceramic, polymer) without requiring external RC networks. Its peak current mode architecture and built-in compensation eliminate the need for loop compensation components-reducing design complexity and BOM count.
How does the LT8614IUDC#TRPBF achieve 2.5µA quiescent current?
The LT8614IUDC#TRPBF achieves 2.5µA 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, disabling most internal circuitry. This behavior is enabled by grounding the SYNC/MODE pin and is validated at 12VIN→3.3VOUT with no load.
Is the LT8614IUDC#TRPBF pin-compatible with other members of the LT861x family?
Yes, the LT8614IUDC#TRPBF shares identical 18-lead 3mm × 4mm QFN (UDC) packaging and pinout with LT8610, LT8611, and LT8613 variants. However, current capability, FET RDS(on), and thermal limits differ-so PCB layout is reusable, but thermal design and output capacitor selection must match the LT8614IUDC#TRPBF's 4A rating.
What is the function of the exposed SW pads (pins 21 and 22) on the LT8614IUDC#TRPBF?
Pins 21 and 22 are exposed SW pads on the underside of the LT8614IUDC#TRPBF package. They must be soldered directly to the SW copper pour on the PCB to provide low-thermal-resistance heat dissipation and reduce high-frequency EMI radiation. Leaving them unconnected degrades both thermal performance (θJA increases from 40°C/W to >60°C/W) and EMI suppression.
LT8614IUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN, 18 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 4A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8614IUDC#TRPBF FAQ
1.How can I place an order for LT8614IUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8614IUDC#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 LT8614IUDC#TRPBF reliable?
The price and inventory of LT8614IUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8614IUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8614IUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8614IUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8614IUDC#TRPBF?
LT8614IUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8614IUDC#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 LT8614IUDC#TRPBF?
For technical support, including LT8614IUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8614IUDC#TRPBF requirements.
6.How does Aetrix verify that LT8614IUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8614IUDC#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 LT8614IUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8614IUDC#TRPBF?
All LT8614IUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8614IUDC#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 LT8614IUDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8614IUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8614IUDC#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
