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Analog Devices Inc. LT8616EUDE#PBF
- Part No.:
- LT8616EUDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8616EUDE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A/2.5A 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,750
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Product details
Overview
LT8616EUDE#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous monolithic step-down 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 regulated 5V/1.5A and 3.3V/2.5A outputs simultaneously in automotive power supplies and industrial DC-DC conversion systems.
For engineers reviewing the LT8616EUDE#PBF datasheet, LT8616EUDE#PBF pinout, LT8616EUDE#PBF application, or LT8616EUDE#PBF equivalent, key selection criteria include ultralow IQ operation, 180° out-of-phase switching for reduced input ripple, independent enable/UVLO pins, soft-start/tracking via TR/SS pins, and thermal robustness in the 3mm × 6mm QFN package.
Technical Context
The LT8616EUDE#PBF 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 MOSFETs; Channel 2 supports up to 2.5A with 145mΩ top/120mΩ bottom MOSFETs. Both channels feature internal compensation, 0.790V FB reference, and ±10% PG thresholds.
It supports three operating modes via SYNC/MODE pin: low-ripple Burst Mode (SYNC grounded), pulse-skipping mode (≥2.4V applied), or external clock synchronization (250kHz–3MHz). The 180° phase shift between channels minimizes input capacitor RMS current, while BIAS pin operation enables efficiency optimization when tied to ≥3.1V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide-range industrial and automotive battery inputs without pre-regulation |
| Quiescent Current | 6.5µA with both channels enabled - enables >10-year battery life in always-on IoT sensors |
| Output Current | CH1: 1.5A; CH2: 2.5A - enables dual-rail power for microcontroller + peripheral subsystems |
| Switching Frequency | 200kHz to 3MHz (programmable via RT resistor) - allows trade-off between size (high-freq) and efficiency (low-freq) |
| Min. On-Time | 35ns - supports high VIN/VOUT ratios (e.g., 42V→3.3V at 700kHz) without pulse skipping |
| FB Reference Voltage | 0.790V ±12mV - enables precise output regulation with standard resistor dividers |
| Enable Threshold | 1.03V rising / 0.98V falling - provides clean, hysteresis-enabled UVLO control per channel |
| Power-Good Accuracy | ±10% of VOUT - ensures reliable system sequencing and fault detection |
Pinout & Package
LT8616EUDE#PBF uses a thermally enhanced 28-lead 3mm × 6mm plastic QFN package (UDE) with exposed GND pad (Pin 29) soldered to PCB for optimal thermal performance (θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Channel 1 input supply | Mandatory ≥3.4V supply for internal bias and CH1 switch; powers INTVCC if BIAS not used |
| VIN2 | Channel 2 input supply | Can be tied to VIN1; CH2 operates only if VIN1 ≥3.4V, regardless of VIN2 level |
| EN/UV1, EN/UV2 | Independent enable/UVLO inputs | 1.03V threshold with 50mV hysteresis; each controls shutdown of respective channel |
| FB1, FB2 | Feedback inputs | Regulated to 0.790V; connect resistor divider from VOUT to set output voltage |
| PG1, PG2 | Open-drain power-good outputs | Pull low until corresponding VOUT reaches ±10% of target; used for system sequencing |
| TR/SS1, TR/SS2 | Soft-start and tracking inputs | 2µA internal pull-up charges external capacitor for controlled ramp; also accepts external voltage for tracking |
| SYNC/MODE | Mode selection and sync input | GND = Burst Mode; ≥2.4V = pulse-skipping; AC signal = external sync (250kHz–3MHz) |
| BOOST1, BOOST2 | Bootstrap drive supplies | Connect 0.1µF ceramic cap from BOOSTx to SWx to enable high-side NMOS gate drive |
| BIAS | Internal regulator supply | Tie to ≥3.1V VOUT (e.g., 3.3V or 5V rail) to reduce VIN1 current and improve light-load efficiency |
| RT | Frequency programming input | Resistor to GND sets switching frequency from 200kHz to 3MHz using linear relationship |
| SW1, SW2 | Switch node outputs | Connect to inductor and BOOSTx cap; require tight layout to minimize EMI and losses |
| GND | Ground reference | All GND pins and exposed pad must be solidly connected to low-impedance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables simultaneous 5V/1.5A and 3.3V/2.5A rails with separate input, enable, and feedback control |
| 180° out-of-phase switching | Reduces input capacitor RMS current by ~30% vs in-phase operation, lowering required capacitance and size |
| Ultralow 6.5µA quiescent current | Extends battery runtime in always-on applications such as telematics, remote sensors, and security systems |
| Internal compensation | Eliminates need for external compensation network, reducing BOM count and design iteration time |
| Tracking soft-start | Allows controlled power-up sequencing (e.g., core before I/O) using single capacitor or external voltage reference |
| Thermally enhanced QFN | 3mm × 6mm footprint with exposed GND pad achieves θJC = 5°C/W for reliable 2.5A operation at 125°C ambient |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for MCU (5V), CAN transceiver (3.3V), and display backlight drivers in vehicle head units. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering isolated, sequenced 5V and 3.3V rails from 9–16V battery input. Use Value: 6.5µA IQ enables low-power sleep mode compliance; 42V ABS MAX rating withstands load-dump transients. | Use Scenario: Compact power solution for DIN-rail mounted programmable logic controller with digital I/O and analog sensor interfaces. IC Role / Device Role / Timing Role: Central point-of-load regulator generating stable 5V logic and 3.3V communication rails from 24V industrial bus. Use Value: 180° phase shift reduces 24V input capacitor stress; TSSOP/QFN options support automated assembly and thermal management. |
| Medical Portable Monitor | Ruggedized Edge Gateway |
Use Scenario: Battery-powered patient monitor requiring long runtime, low EMI, and reliable power sequencing for CPU, touchscreen, and wireless radios. IC Role / Device Role / Timing Role: Dual-output buck supplying 5V for display driver and 3.3V for ARM Cortex-M7 and BLE SoC. Use Value: Burst Mode maintains <15mV output ripple at µA loads; TR/SS tracking ensures safe core-first startup. | Use Scenario: Outdoor communications gateway with LTE, GNSS, and environmental sensors operating from solar-charged 12V battery. IC Role / Device Role / Timing Role: Main power IC converting variable 10–30V battery input to fixed 5V/3.3V system rails. Use Value: 35ns min on-time supports full regulation across entire battery range; BIAS pin improves efficiency at partial load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3375EFE#PBF | Octal 1A buck (configurable as dual 2A); 2.25V–20V input; 17µA IQ; requires external compensation | Lower input voltage ceiling (20V vs 42V); better for low-VIN multi-rail systems; no BIAS pin | Select when needing more than two outputs or tighter board space; avoid for 24V+ automotive use |
| MPQ4436AGL-AEC1-P | Single 3.5A buck; 3.3V–36V input; 17µA IQ; AEC-Q100 Grade 1; no dual-channel or tracking | Single-output only; lacks TR/SS, PG, and phase-shift features; automotive qualified | Select for cost-sensitive AEC-Q100-compliant single-rail designs; not suitable for dual-rail sequencing |
Compared with LTC3375EFE#PBF and MPQ4436AGL-AEC1-P, the LT8616EUDE#PBF uniquely combines 42V input tolerance, true dual-channel independence with tracking, and industry-leading 6.5µA IQ-making it optimal for space-constrained, battery-sensitive, high-input-voltage applications where rail coordination matters.
Availability
LT8616EUDE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, portable medical monitors, and ruggedized edge gateways requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term lifecycle assurance.
Supply support for LT8616EUDE#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous reliability testing and automotive-grade qualification.
The LT8616EUDE#PBF belongs to the LT86xx family of ultralow-IQ synchronous buck regulators, engineered specifically for always-on systems in automotive, industrial, and portable electronics where standby power and transient response are critical.
FAQ
What is the maximum input voltage rating for the LT8616EUDE#PBF?
The LT8616EUDE#PBF has an absolute maximum input voltage rating of 42V on VIN1 and VIN2 pins. This allows direct connection to 24V and 36V industrial buses and withstands automotive load-dump transients. Operation above 42V risks permanent damage. The device regulates down to 3.4V minimum input, supporting wide VIN applications without external pre-regulators.
How does the LT8616EUDE#PBF achieve 6.5µA quiescent current?
The LT8616EUDE#PBF achieves 6.5µA total IQ by combining low-leakage internal circuitry, optimized Burst Mode operation (3µA sleep current), and intelligent bias sourcing. When both channels are active in Burst Mode, 1.7µA powers shared bias circuits from VIN1, and each channel contributes ~2.4µA during burst pulses. Minimizing feedback divider current (e.g., using 1MΩ resistors) is essential to reach the specified 6.5µA value in real-world designs.
Can the LT8616EUDE#PBF synchronize both channels to an external clock?
Yes, the LT8616EUDE#PBF supports external clock synchronization via the SYNC/MODE pin. When an AC signal (250kHz–3MHz) is applied, Channel 1 aligns its positive switching edge to the external clock's rising edge, and Channel 2 aligns to the falling edge-maintaining 180° phase separation. This reduces EMI peaks and enables deterministic timing in noise-sensitive systems like radar or audio processing.
What is the purpose of the BIAS pin on the LT8616EUDE#PBF?
The BIAS pin on the LT8616EUDE#PBF supplies the internal regulator when connected to a voltage ≥3.1V (e.g., VOUT1 or VOUT2). Doing so reduces current draw from VIN1, improving light-load efficiency and lowering thermal stress. If unused, the BIAS pin must be grounded. A 1µF bypass capacitor is required if BIAS is connected to a supply other than VOUT.
Does the LT8616EUDE#PBF support power sequencing between its two outputs?
Yes, the LT8616EUDE#PBF supports precise power sequencing via the TR/SS1 and TR/SS2 pins. By connecting a resistor divider from one output to the TR/SS pin of the other channel, the second output tracks the first during startup. Alternatively, soft-start capacitors on each TR/SS pin allow independent, adjustable ramp rates-enabling core-before-I/O or voltage-margining sequences without external controllers.
LT8616EUDE#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
- 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)
LT8616EUDE#PBF FAQ
1.How can I place an order for LT8616EUDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8616EUDE#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 LT8616EUDE#PBF reliable?
The price and inventory of LT8616EUDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8616EUDE#PBF is usually 5 days.
3.What payment methods are accepted for LT8616EUDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8616EUDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8616EUDE#PBF?
LT8616EUDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8616EUDE#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 LT8616EUDE#PBF?
For technical support, including LT8616EUDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8616EUDE#PBF requirements.
6.How does Aetrix verify that LT8616EUDE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8616EUDE#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 LT8616EUDE#PBF meets industry standards.
7.What is the process for return or replacement of LT8616EUDE#PBF?
All LT8616EUDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8616EUDE#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 LT8616EUDE#PBF part is unused and in its original packaging.
Return procedure for LT8616EUDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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