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Analog Devices Inc. LT8616EFE#TRPBF
- Part No.:
- LT8616EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8616EFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,136
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Product details
Overview
LT8616EFE#TRPBF 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#TRPBF datasheet, LT8616EFE#TRPBF pinout, LT8616EFE#TRPBF application, or LT8616EFE#TRPBF 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#TRPBF 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 180° phase offset to minimize input capacitor RMS current.
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 frequency down to light loads. 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 and industrial 24V/36V systems without pre-regulation. |
| Output Current (Ch1 / Ch2) | 1.5A / 2.5A - enables dual-rail power for SoC + peripheral subsystems (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. |
| Min. On-Time | 35ns - allows high VIN/VOUT ratios (e.g., 42V→3.3V at 700kHz) 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). |
| FB Reference Voltage | 0.790V ±12mV - precise regulation enables accurate output setting with standard 1% resistors (e.g., 1MΩ/316kΩ for 5V). |
| Power-Good Threshold | ±10% of VFB - ensures reliable system reset assertion when either output deviates beyond regulation window. |
Pinout & Package
LT8616EFE#TRPBF 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 designs with θJA = 30°C/W and θJC(PAD) = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Independent input supplies | VIN1 powers internal circuitry and Channel 1; VIN2 powers Channel 2 only - allows separate input sources or shared rail with VIN1 ≥3.4V mandatory. |
| EN/UV1, EN/UV2 | Enable/undervoltage lockout inputs | Hysteretic 1.03V rising / 0.98V falling threshold - enables programmable UVLO using external resistor dividers; must not be left floating. |
| FB1, FB2 | Feedback voltage sense inputs | Regulated to 0.790V reference - connects to resistor divider tap; phase-lead capacitor (1.5–10pF) required between FB and VOUT for stability. |
| PG1, PG2 | Open-drain power-good outputs | Assert low until corresponding output reaches ±10% of target - used for sequenced power-up or system reset coordination. |
| TR/SS1, TR/SS2 | Soft-start/tracking control inputs | 2µA internal pull-up charges external capacitor for voltage ramp; below 0.79V forces FB regulation to TR/SS voltage - enables output tracking or controlled startup. |
| SYNC/MODE | Mode selection and synchronization input | GND = Burst Mode; ≥2.4V = pulse-skipping; external clock = synchronized operation - determines light-load behavior and noise profile. |
| SW1, SW2 | Switch node outputs | Connect to inductors and BOOST capacitors - requires tight layout with minimal loop area to suppress EMI and switching losses. |
| BOOST1, BOOST2 | Bootstrap supply inputs | 0.1µF ceramic capacitor required between BOOST and respective SW pin - provides gate drive voltage >VIN for top FETs. |
| BIAS | Internal regulator supply | Connect to VOUT ≥3.3V to reduce IQ; otherwise draws from VIN1 - lowers total quiescent current by sourcing bias from regulated output. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables simultaneous 5V/1.5A and 3.3V/2.5A outputs with separate enable, feedback, and power-good control per channel. |
| Ultralow 6.5µA quiescent current | Maintains regulation at zero load while minimizing battery drain - critical for automotive always-on modules and IoT edge nodes. |
| 180° out-of-phase switching | Reduces input capacitor RMS current by ~30% versus in-phase operation - lowers input ripple and extends capacitor lifetime. |
| 35ns minimum on-time | Supports high step-down ratios (e.g., 42V→3.3V) at 700kHz without cycle skipping - preserves transient response and efficiency. |
| Internal compensation | Eliminates external compensation components - simplifies design, reduces BOM count, and improves production yield. |
| TSSOP-28 with exposed pad | Provides robust thermal performance (θJA = 30°C/W) in compact footprint - suitable for space-constrained automotive PCBs. |
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/I²C). 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 up to 42V. Use Value: 6.5µA IQ extends sleep-mode battery life; 180° phase shift minimizes conducted EMI into sensitive audio circuits. |
Use Scenario: Powering isolated digital I/O banks and microcontroller in DIN-rail mounted PLC. IC Role / Device Role / Timing Role: High-reliability dual-output buck supplying 5V logic and 3.3V communication interfaces from 24V industrial bus. Use Value: 42V max input withstands 24V bus surges; independent EN/UV pins allow safe hot-swap sequencing during field maintenance. |
| Medical Portable Monitor | Telematics Control Unit (TCU) |
|
Use Scenario: Battery-powered patient monitor requiring low-noise, long-duration standby operation. IC Role / Device Role / Timing Role: Main power IC generating 5V for display backlight driver and 3.3V for sensor interface MCU. Use Value: Burst Mode maintains <15mV ripple at µA loads - avoids interference with analog front-end signal integrity. |
Use Scenario: Cellular-connected vehicle gateway managing CAN, LTE, and GNSS subsystems. IC Role / Device Role / Timing Role: Central power manager delivering 5V (modem) and 3.3V (GNSS receiver) from automotive battery. Use Value: Independent PG1/PG2 signals enable firmware-controlled power sequencing across heterogeneous subsystems. |
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 |
|---|---|---|---|
| LT8646S | Single-channel 6A buck with same 3.4V–42V input, 6.5µA IQ, and 35ns min on-time - lacks second output and independent channel control. | Requires external LDO or second converter for dual-rail needs - increases board area and component count. | Select when single high-current rail suffices and cost/BOM simplicity outweighs need for integrated dual output. |
| MPQ4420AGL-A | Dual 2A/2A buck with 3.3V–36V input, 25µA IQ, and 100ns min on-time - lower efficiency at light load and no phase offset. | No 180° phase shift - higher input ripple; no TR/SS or independent PG pins - limits sequencing flexibility. | Select for cost-sensitive industrial applications where 25µA IQ and 36V max input meet requirements and phase alignment is acceptable. |
Compared with LT8616EFE#TRPBF, LT8646S eliminates channel independence but offers higher per-channel current, while MPQ4420AGL-A trades IQ and phase control for lower unit cost - making LT8616EFE#TRPBF optimal for automotive and medical systems demanding ultra-low IQ, precise sequencing, and low EMI.
Availability
LT8616EFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, portable medical monitors, and telematics control units requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LT8616EFE#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 continues its legacy of high-performance power management ICs with rigorous automotive qualification and reliability testing.
The LT8616EFE#TRPBF belongs to the LT86xx family of ultralow-IQ synchronous buck regulators designed specifically for automotive and industrial applications where battery longevity, transient robustness, and EMI control are critical.
FAQ
What is the maximum input voltage rating for LT8616EFE#TRPBF?
The LT8616EFE#TRPBF has an absolute maximum input voltage rating of 42V on VIN1 and VIN2 pins. Operation above 42V risks permanent damage. The device is specified for continuous operation from 3.4V to 42V, making it suitable for 12V and 24V automotive systems with load-dump transients.
Does LT8616EFE#TRPBF support independent output voltage programming?
Yes, LT8616EFE#TRPBF supports fully independent output voltage programming: Channel 1 uses FB1 with resistor divider R1/R2, Channel 2 uses FB2 with R3/R4. Each FB pin regulates to 0.790V, enabling precise setting of different voltages (e.g., 5V and 3.3V) without interaction between channels.
How does the SYNC/MODE pin affect LT8616EFE#TRPBF operation?
The SYNC/MODE pin configures LT8616EFE#TRPBF's light-load behavior: grounded = low-ripple Burst Mode (6.5µA IQ); ≥2.4V = pulse-skipping mode (higher IQ, fixed frequency); external clock = synchronized operation. It also controls phase alignment - Channel 1 aligns to clock rising edge, Channel 2 to falling edge.
Can LT8616EFE#TRPBF operate with only one input supply?
Yes - LT8616EFE#TRPBF can operate with a single input supply connected to both VIN1 and VIN2, but VIN1 must be ≥3.4V at all times. Channel 2 will function only if VIN1 meets this requirement, even if VIN2 is tied to the same rail or left unconnected.
What thermal considerations apply to LT8616EFE#TRPBF in TSSOP-28 package?
LT8616EFE#TRPBF in FE package has θJA = 30°C/W and θJC(PAD) = 10°C/W. The exposed pad (Pin 29) must be soldered to a large copper pour for effective heat dissipation. At 2.5A load and 12V input, junction temperature rise is ~45°C above ambient - derating required above 100°C ambient.
LT8616EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8616EFE#TRPBF FAQ
1.How can I place an order for LT8616EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8616EFE#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 LT8616EFE#TRPBF reliable?
The price and inventory of LT8616EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8616EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8616EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8616EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8616EFE#TRPBF?
LT8616EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8616EFE#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 LT8616EFE#TRPBF?
For technical support, including LT8616EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8616EFE#TRPBF requirements.
6.How does Aetrix verify that LT8616EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8616EFE#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 LT8616EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8616EFE#TRPBF?
All LT8616EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8616EFE#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 LT8616EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8616EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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