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Analog Devices Inc. LT8616EFE#PBF
- Part No.:
- LT8616EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8616EFE#PBF.pdf
- Description:
- IC REG BUCK ADJ DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:265
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Product details
Overview
LT8616EFE#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous monolithic step-down regulator with independent 2.5A and 1.5A output capability, 3.4V–42V input range, 6.5µA quiescent current in Burst Mode, and 35ns minimum on-time. It delivers stable 5V/1.5A and 3.3V/2.5A outputs for automotive infotainment power rails.
For engineers reviewing the LT8616EFE#PBF datasheet, LT8616EFE#PBF pinout, LT8616EFE#PBF application, or LT8616EFE#PBF equivalent, key selection criteria include ultralow IQ under light load, 180° out-of-phase switching to reduce input ripple, independent EN/UV pins for channel sequencing, and TSSOP-28 thermal performance with exposed pad.
Technical Context
The LT8616EFE#PBF integrates two peak-current-mode buck regulators sharing internal bias 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 internal compensation, adjustable 200kHz–3MHz switching via RT resistor, and synchronized 180° phase alignment.
Burst Mode operation enables 6.5µA total IQ at no load while maintaining <15mV output ripple; pulse-skipping mode (via SYNC/MODE ≥2.4V) sustains full switching frequency down to ~50mA load. Each channel includes dedicated PG, TR/SS, FB, and EN/UV pins for independent soft-start, tracking, power-good signaling, and undervoltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients (cold crank, load dump) without external pre-regulation. |
| Output Current (Ch1 / Ch2) | 1.5A / 2.5A - enables dual-rail supply for SoC + peripheral logic (e.g., 5V MCU core + 3.3V I/O). |
| Quiescent Current | 6.5µA (both channels active, Burst Mode) - extends battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Minimum On-Time | 35ns - allows high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse skipping or instability. |
| Switching Frequency Range | 200kHz to 3MHz - selectable via RT resistor; higher frequencies enable smaller magnetics (e.g., 2.2µH at 2MHz vs. 10µH at 700kHz). |
| FB Reference Voltage | 0.790V ±12mV - sets output accuracy; enables precise 5V (R1=1MΩ, R2=316kΩ) and 3.3V (R3=1MΩ, R4=187kΩ) regulation. |
| Power-Good Threshold | ±10% of VOUT - PG1/PG2 open-drain outputs signal valid regulation, enabling safe processor reset sequencing. |
Pinout & Package
LT8616EFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed GND pad (Pin 29), rated for –40°C to +125°C junction temperature. The package supports high-power density layouts with low θJA = 30°C/W when properly soldered to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Independent input supplies | VIN1 powers internal circuitry and Ch1 switch; VIN2 powers Ch2 switch only. VIN1 ≥3.4V required for any channel operation. |
| EN/UV1, EN/UV2 | Enable/undervoltage lockout inputs | 1.03V rising threshold with 50mV hysteresis; enables independent channel startup sequencing and input brownout protection. |
| FB1, FB2 | Feedback voltage sense inputs | Regulated to 0.790V reference; used with resistor dividers to set 5V/3.3V outputs with ±1% typical accuracy. |
| PG1, PG2 | Open-drain power-good outputs | Pull low until respective VOUT reaches ±10% of target; used for system-level power sequencing and fault detection. |
| TR/SS1, TR/SS2 | Soft-start/tracking control inputs | 2µA internal current source charges external capacitor for controlled ramp-up; also supports output tracking (e.g., VOUT2 tracks VOUT1). |
| SYNC/MODE | Mode selection and synchronization input | GND = Burst Mode (ultralow IQ); ≥2.4V = pulse-skipping; external clock = synchronized operation with 180° phase shift between channels. |
| SW1, SW2 | Switch node outputs | Connect to inductors and BOOST capacitors; require tight layout to minimize EMI and switching losses. |
| BOOST1, BOOST2 | Bootstrap voltage supplies | 0.1µF ceramic caps between BOOSTx and SWx provide gate drive voltage >VIN for high-side NMOS switches. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables simultaneous 5V/1.5A and 3.3V/2.5A generation from single 12V–42V input without external controllers or discrete FETs. |
| Ultralow 6.5µA quiescent current | Extends standby time in battery-powered automotive modules (e.g., CAN gateway, smart sensor nodes) while maintaining regulation. |
| 180° out-of-phase switching | Reduces input capacitor RMS current by ~30% and minimizes conducted EMI peaks compared to in-phase dual converters. |
| Internal compensation | Eliminates need for external compensation network; simplifies design and improves stability across all loads and input voltages. |
| TSSOP-28 with exposed GND pad | Provides low thermal resistance (θJC = 10°C/W) for reliable 2.5A continuous operation at +125°C ambient without heatsink. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual-rail power for head unit SoC (5V core) and display interface (3.3V LVDS). IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 5V/1.5A and 3.3V/2.5A from 12V battery with transient immunity. Use Value: 6.5µA IQ enables always-on GPS/WiFi functionality; 42V max input withstands load-dump events per ISO 7637-2. |
Use Scenario: Powering isolated digital I/O banks (3.3V) and analog sensor front-end (5V) in DIN-rail mounted controller. IC Role / Device Role / Timing Role: Compact dual-output regulator replacing two discrete buck ICs to reduce BOM count and PCB area. Use Value: Independent EN/UV pins allow staggered startup to limit inrush; PG outputs coordinate FPGA configuration sequence. |
| Telematics Control Unit (TCU) | Railway Signaling Interface |
|
Use Scenario: Power management for LTE modem (3.3V), GNSS receiver (3.3V), and microcontroller (5V) in vehicle-to-cloud gateway. IC Role / Device Role / Timing Role: High-efficiency dual buck supplying three critical subsystems with minimal heat dissipation in sealed enclosure. Use Value: 35ns min on-time supports 42V→3.3V conversion at 2MHz, enabling compact 2.2µH inductor and reducing solution size by 40% vs. 700kHz design. |
Use Scenario: Providing fail-safe 5V logic and 3.3V communication rail for trackside Ethernet switch operating from 72V nominal railway supply. IC Role / Device Role / Timing Role: Primary step-down regulator meeting EN 50155 shock/vibration and temperature requirements (-40°C to +70°C). Use Value: TSSOP-28 package with exposed pad ensures thermal reliability at full 2.5A load under sustained 72V input derating; 150°C H-grade option available. |
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 |
|---|---|---|---|
| LT8640S-1 | Single-channel 6A buck with integrated MOSFETs; no second output; 2.5µA IQ; supports 3.4V–42V input. | Requires external LDO or second converter for dual-rail needs; better suited for high-current single-output systems. | Select when only one regulated rail is needed and higher peak current (>2.5A) is required; not a drop-in replacement. |
| TPS54560B | Single-channel 5A buck; 145µA IQ; 3.5V–60V input; no integrated tracking or PG pins; requires external compensation. | Lacks dual-output capability and ultralow IQ; suitable for cost-sensitive industrial supplies where efficiency at light load is secondary. | Choose for wider input range (60V) and higher current, but expect higher no-load consumption and added design complexity. |
Compared with LT8640S-1 and TPS54560B, the LT8616EFE#PBF uniquely delivers true dual independent regulation with sub-10µA quiescent current, integrated soft-start/tracking, and automotive-grade thermal performance in a single TSSOP package-making it optimal for space-constrained, battery-sensitive dual-rail systems.
Availability
LT8616EFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and telematics control units requiring stable component supply with extended temperature support and long-term lifecycle assurance.
Supply support for LT8616EFE#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 automotive qualification and long-term product support.
The LT8616EFE#PBF belongs to the LT86xx family of ultralow-IQ synchronous buck regulators, designed specifically for automotive and industrial applications demanding high efficiency across full load range and robust operation under harsh input conditions.
FAQ
What is the maximum junction temperature rating for the LT8616EFE#PBF?
The LT8616EFE#PBF is rated for –40°C to +125°C junction temperature. Its TSSOP-28 package with exposed GND pad achieves θJC = 10°C/W, enabling reliable 2.5A continuous operation at +125°C ambient when properly mounted on ≥2 oz copper with thermal vias. Derating curves in the datasheet confirm full 2.5A output at 125°C case temperature.
Can the LT8616EFE#PBF operate with only one channel enabled?
Yes, the LT8616EFE#PBF supports independent channel operation. Pulling EN/UV1 low disables Channel 1 while Channel 2 remains fully functional if EN/UV2 is high and VIN1 ≥3.4V. Quiescent current drops to ~3.5µA in this configuration. The device draws only 1.7µA total when both channels are disabled.
How does the LT8616EFE#PBF achieve 6.5µA quiescent current with both channels active?
The LT8616EFE#PBF achieves 6.5µA total IQ through optimized Burst Mode operation: internal circuitry enters deep sleep between energy pulses, with only essential bias circuits (1.7µA from VIN1) remaining active. Feedback divider current must be minimized (e.g., 1MΩ+316kΩ) to avoid adding parasitic load; typical design yields exactly 6.5µA at no load per datasheet Figure G06.
What is the purpose of the BIAS pin on the LT8616EFE#PBF?
The BIAS pin on the LT8616EFE#PBF supplies the internal regulator when connected to a voltage ≥3.1V-typically tied to VOUT2 (3.3V) to reduce VIN1 current draw and improve light-load efficiency. When unused, it must be grounded. A 1µF bypass capacitor is required if BIAS is connected to a supply other than VOUT1 or VOUT2.
Does the LT8616EFE#PBF support output voltage tracking during startup?
Yes, the LT8616EFE#PBF supports precise output tracking via TR/SS1 and TR/SS2 pins. Connecting TR/SS2 to a resistor divider from VOUT1 configures Channel 2 to track Channel 1's ramp. Internal 2µA current sources generate linear voltage ramps, ensuring monotonic startup and preventing latch-up in downstream logic powered by both rails.
LT8616EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8616EFE#PBF FAQ
1.How can I place an order for LT8616EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8616EFE#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 LT8616EFE#PBF reliable?
The price and inventory of LT8616EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8616EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8616EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8616EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8616EFE#PBF?
LT8616EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8616EFE#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 LT8616EFE#PBF?
For technical support, including LT8616EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8616EFE#PBF requirements.
6.How does Aetrix verify that LT8616EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8616EFE#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 LT8616EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8616EFE#PBF?
All LT8616EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8616EFE#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 LT8616EFE#PBF part is unused and in its original packaging.
Return procedure for LT8616EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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