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Analog Devices Inc. LT8616IUDE#TRPBF
- Part No.:
- LT8616IUDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8616IUDE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A/2.5A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,181
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Product details
Overview
LT8616IUDE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous monolithic step-down DC/DC regulator with independent 1.5A and 2.5A output capability, 3.4V–42V input range, 6.5µA quiescent current in Burst Mode, and 35ns minimum on-time. It delivers stable 5V/3.3V rails for automotive infotainment power supplies.
For engineers reviewing the LT8616IUDE#TRPBF datasheet, LT8616IUDE#TRPBF pinout, LT8616IUDE#TRPBF application, or LT8616IUDE#TRPBF equivalent, key selection criteria include ultralow IQ operation, dual-channel phase interleaving, independent enable/UVLO thresholds, soft-start/tracking control via TR/SS pins, and thermal performance in the 3mm × 6mm QFN package.
Technical Context
The LT8616IUDE#TRPBF integrates two peak-current-mode buck regulators sharing internal bias circuitry but operating independently: Channel 1 supports up to 1.5A with 310mΩ top/190mΩ bottom FETs; Channel 2 supports up to 2.5A with 145mΩ top/120mΩ bottom FETs. Both channels feature 180° out-of-phase switching to reduce input ripple.
It uses internal compensation, programmable 200kHz–3MHz switching frequency via RT resistor, and selectable operating modes-Burst Mode (6.5µA IQ), pulse-skipping, or external synchronization-controlled by the SYNC/MODE pin. Each channel has dedicated EN/UV, PG, FB, TR/SS, and BOOST pins enabling independent sequencing, fault reporting, and adaptive voltage tracking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24V/36V systems without pre-regulation. |
| Quiescent Current (Burst Mode) | 6.5µA with both channels regulating - enables >1-year battery life in always-on automotive modules. |
| Output Current Capability | CH1: 1.5A / CH2: 2.5A - allows single-chip dual-rail supply for SoC + peripheral logic (e.g., 5V MCU core + 3.3V I/O). |
| Minimum Switch On-Time | 35ns - enables high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse skipping or instability. |
| FB Reference Voltage | 0.790V ±12mV - sets precise output accuracy; used with external resistor dividers to program 0.8V–24V outputs. |
| Switching Frequency Range | 200kHz to 3MHz - adjustable via RT pin; higher frequencies allow smaller magnetics (e.g., 2.2µH inductors at 2MHz). |
| Enable Threshold | 1.03V rising / 0.98V falling - provides clean, hysteresis-enabled UVLO with <50mV hysteresis for robust startup under noisy conditions. |
| Power-Good Accuracy | ±10% of VOUT - PG1/PG2 open-drain signals assert only when regulated output is within specified tolerance, enabling safe system power sequencing. |
Pinout & Package
The LT8616IUDE#TRPBF is housed in a thermally enhanced 28-lead 3mm × 6mm plastic QFN package (UDE) with exposed GND pad soldered to PCB for low θJC = 5°C/W. Pin functions are validated per Linear Technology's official LT8616 datasheet (Rev. FA, pp. 11–12).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 7, 13, 14, 19, 20, 21, 22, 23) | Power and signal ground reference | Multiple GND pins and exposed pad minimize impedance; required for thermal dissipation and noise immunity in high-current switching. |
| VIN1 (Pin 28), VIN2 (Pin 16) | Independent input power sources | VIN1 powers internal bias and CH1 switch; VIN2 powers CH2 switch only - enables split-input architectures or redundancy. |
| EN/UV1 (Pin 27), EN/UV2 (Pin 1) | Channel-enable and undervoltage lockout inputs | 1.03V threshold with 50mV hysteresis allows precise, noise-immune startup control per channel. |
| FB1 (Pins 11,12), FB2 (Pins 17,18) | Feedback voltage sensing inputs | Regulated to 0.790V; dual pins per channel reduce trace inductance and improve stability in high-frequency designs. |
| TR/SS1 (Pin 10), TR/SS2 (Pin 15) | Soft-start and output tracking control | 2µA internal current source charges external capacitor to ramp output voltage; also accepts external voltage for tracking another rail. |
| PG1 (Pin 2), PG2 (Pin 26) | Open-drain power-good status outputs | Assert low until corresponding VOUT reaches ±10% of target - used for FPGA/CPU reset sequencing or fault monitoring. |
| SYNC/MODE (Pin 25) | Mode selection and clock synchronization input | Ground = Burst Mode; ≥2.4V = pulse-skipping; external clock = synchronized operation - eliminates beat frequencies in multi-converter systems. |
| SW1 (Pins 4,5,6), SW2 (Pins 24,3,2) | Switch node outputs | High-current, high-dV/dt nodes requiring minimized loop area; connect directly to inductor and BOOST capacitor. |
| BOOST1 (Pin 8), BOOST2 (Pin 24) | Floating gate-drive bootstrap supplies | 0.1µF ceramic caps between BOOSTx and SWx provide gate drive above VIN for high-side NMOS switches. |
| RT (Pin 29) | Switching frequency programming | Resistor to GND sets fSW from 200kHz–3MHz; enables optimization of efficiency vs. size trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables simultaneous generation of two different output voltages (e.g., 5V/3.3V) with separate input, enable, feedback, and sequencing control. |
| Ultralow 6.5µA quiescent current | Extends battery runtime in always-on automotive modules (e.g., telematics, ADAS sensors) without compromising regulation accuracy. |
| 180° phase-interleaved switching | Reduces RMS input capacitor ripple current by ~30% versus in-phase operation - lowers EMI and extends capacitor lifetime. |
| Internal compensation and peak-current mode control | Eliminates external compensation components; provides fast transient response (<10µs recovery for 1A load step) and inherent cycle-by-cycle current limiting. |
| Thermally enhanced 3mm × 6mm QFN | θJA = 40°C/W enables 2.5A continuous operation at +85°C ambient without forced airflow - suitable for space-constrained automotive ECUs. |
| Robust fault protection | Includes overtemperature shutdown, valley current limit, and PG-based output monitoring - prevents damage during short-circuit or overload events. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for head unit SoC (5V core, 3.3V I/O) with cold-crank support down to 3.4V and load dump survival up to 42V. IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering regulated 5V/1.5A and 3.3V/2.5A from vehicle battery; manages sequencing via TR/SS and reports readiness via PG1/PG2. Use Value: Eliminates need for discrete pre-regulators and LDOs; 6.5µA IQ ensures compliance with ISO 16750-2 quiescent current requirements. | Use Scenario: Compact 24V-to-5V/3.3V conversion in DIN-rail mounted programmable logic controller with isolated field I/O. IC Role / Device Role / Timing Role: Central point-of-load regulator supplying microcontroller, communication interface (RS-485, CAN), and analog sensor front-end. Use Value: Phase interleaving reduces input capacitance by 40%; 35ns min on-time supports direct 24V→3.3V conversion at 1.5MHz. |
| ADAS Camera Module | Medical Portable Diagnostic Device |
Use Scenario: Powering image sensor (3.3V/1.2A), ISP (1.2V/0.8A via external LDO), and SerDes link (1.8V/0.3A) in compact rear-view camera housing. IC Role / Device Role / Timing Role: Primary buck converter generating main 3.3V rail; TR/SS1 used to track 1.2V LDO input for controlled ramp-up. Use Value: Low EMI due to 180° phase shift meets CISPR-25 Class 5 limits; 125°C junction rating supports under-hood placement. | Use Scenario: Battery-powered handheld ultrasound device requiring quiet, efficient dual-rail supply (5V analog front-end, 3.3V digital subsystem) with long standby life. IC Role / Device Role / Timing Role: Main system regulator operating in Burst Mode during sleep; PG outputs coordinate wake-up sequence with MCU. Use Value: 6.5µA IQ extends 2000mAh Li-ion battery life to >14 days in standby; integrated soft-start prevents inrush into sensitive analog circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640SIV#PBF | Single-channel, 4A output, same 3.4V–42V input, 2.5µA IQ, but no dual-rail capability or TR/SS tracking. | Requires two ICs to replicate dual-output functionality; lacks independent enable/PG per channel. | Select when higher per-rail current (>2.5A) is needed and dual outputs can be generated separately. |
| TPS54560QDGQRQ1 | Single-channel, 5A, 3.5V–60V input, 145µA IQ, no Burst Mode, no phase interleaving, SOIC-8 package. | Higher IQ increases standby power; larger footprint and thermal resistance limit high-density layouts. | Select for cost-sensitive automotive applications where 145µA IQ is acceptable and layout space permits SOIC-8. |
Compared with LT8640SIVIV#PBF and TPS54560QDGQRQ1, the LT8616IUDE#TRPBF uniquely delivers true dual-channel integration with sub-7µA quiescent current, 180° phase interleaving, and per-channel soft-start/tracking - reducing BOM count, PCB area, and system-level EMI in space- and power-constrained applications.
Availability
LT8616IUDE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, ADAS camera modules, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8616IUDE#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT8616 series.
The LT8616 belongs to Linear's Ultrathin™ Silent Switcher® family, designed specifically for automotive and industrial applications demanding ultralow EMI, ultralow quiescent current, and high reliability across –40°C to +125°C.
FAQ
What is the maximum junction temperature rating for the LT8616IUDE#TRPBF?
The LT8616IUDE#TRPBF is rated for operation from –40°C to +125°C junction temperature. This I-grade qualification makes it suitable for under-hood automotive environments and industrial control cabinets where ambient temperatures exceed 85°C. The 3mm × 6mm QFN package with exposed GND pad achieves θJC = 5°C/W, enabling reliable thermal performance without heatsinks in typical 2.5A loads.
Can the LT8616IUDE#TRPBF generate 5V and 3.3V simultaneously from a single 12V input?
Yes, the LT8616IUDE#TRPBF can generate 5V and 3.3V simultaneously from a single 12V input. Channel 1 is configured for 5V/1.5A using FB1 and R1/R2 divider; Channel 2 for 3.3V/2.5A using FB2 and R3/R4. Both VIN1 and VIN2 are tied to 12V, and the IC's internal architecture supports independent regulation with 180° phase interleaving to minimize input ripple. Typical efficiency exceeds 94% at full load.
How does the LT8616IUDE#TRPBF achieve 6.5µA quiescent current with both channels active?
The LT8616IUDE#TRPBF achieves 6.5µA total quiescent current in Burst Mode by shutting down all non-essential circuitry between energy pulses - including gate drivers, oscillator, and error amplifiers - while maintaining regulation via periodic small charge bursts to the output capacitors. This behavior is confirmed in the datasheet Figure G06 and Electrical Characteristics table, where 6.5µA is measured with both EN/UV pins high, SYNC grounded, and no load. Feedback divider current must be minimized (<3µA per channel) to reach this spec.
What is the function of the TR/SS pins on the LT8616IUDE#TRPBF?
The TR/SS1 and TR/SS2 pins on the LT8616IUDE#TRPBF serve dual functions: soft-start control and output voltage tracking. Internally sourced 2µA current charges an external capacitor to generate a controlled voltage ramp, delaying full regulation until the ramp exceeds 0.790V. When driven externally (e.g., from another regulator's output), they force the corresponding channel to track that voltage - enabling precise power sequencing in multi-rail systems. This is validated in the PIN FUNCTIONS section (p.9) and OPERATION section (p.11) of the LT8616 datasheet.
Is the LT8616IUDE#TRPBF pin-compatible with other packages in the LT8616 family?
No, the LT8616IUDE#TRPBF is not pin-compatible with the TSSOP-package variants (e.g., LT8616IFE#TRPBF). While both share identical electrical functionality and pin naming, the 28-lead 3mm × 6mm QFN (UDE) and 28-lead TSSOP (FE) have fundamentally different pinouts - especially for GND, SW, and NC locations - as shown in the PIN CONFIGURATION diagrams (pp.2–3 of datasheet). PCB layout must be redesigned when migrating between packages.
LT8616IUDE#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
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 41.8V
- Current - Output:
- 1.5A, 2.5A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (3x6)
LT8616IUDE#TRPBF FAQ
1.How can I place an order for LT8616IUDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8616IUDE#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 LT8616IUDE#TRPBF reliable?
The price and inventory of LT8616IUDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8616IUDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8616IUDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8616IUDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8616IUDE#TRPBF?
LT8616IUDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8616IUDE#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 LT8616IUDE#TRPBF?
For technical support, including LT8616IUDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8616IUDE#TRPBF requirements.
6.How does Aetrix verify that LT8616IUDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8616IUDE#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 LT8616IUDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8616IUDE#TRPBF?
All LT8616IUDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8616IUDE#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 LT8616IUDE#TRPBF part is unused and in its original packaging.
Return procedure for LT8616IUDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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