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Analog Devices Inc. LT8616IFE#PBF
- Part No.:
- LT8616IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8616IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
LT8616IFE#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 stable 5V/1.5A and 3.3V/2.5A outputs for automotive infotainment power rails and industrial sensor node supplies.
For engineers reviewing the LT8616IFE#PBF datasheet, LT8616IFE#PBF pinout, LT8616IFE#PBF application, or LT8616IFE#PBF equivalent, key selection criteria include ultralow IQ under light load, 180° out-of-phase switching to reduce input ripple, independent EN/UV thresholds, and TSSOP-28 thermal performance up to 125°C junction temperature.
Technical Context
The LT8616IFE#PBF integrates two peak-current-mode buck regulators sharing internal bias circuitry but operating independently-Channel 1 supports 1.5A with 3.4V min VIN, Channel 2 supports 2.5A and requires VIN1 ≥3.4V but has no VIN2 minimum. Each channel features internal compensation, soft-start via TR/SS pins, and ±10% power-good monitoring on dedicated PG1/PG2 open-drain outputs.
Switching frequency is programmable from 200kHz to 3MHz via RT resistor, synchronizable externally via SYNC/MODE pin, and defaults to low-ripple Burst Mode when SYNC/MODE is grounded. The device uses separate BOOST1/BOOST2 pins with 0.1µF bootstrap capacitors and supports BIAS pin operation at ≥3.1V to reduce VIN1 loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports 12V/24V automotive and industrial bus inputs without pre-regulation |
| Output Current Capability | CH1: 1.5A, CH2: 2.5A - enables dual-rail power delivery for SoC + peripheral subsystems |
| Quiescent Current | 6.5µA (both channels active, Burst Mode) - sustains >1-year battery life in always-on telematics modules |
| Minimum Switch On-Time | 35ns - enables high VIN/VOUT ratios (e.g., 42V→3.3V) at 2MHz+ switching frequencies |
| FB Reference Voltage | 0.790V ±12mV - sets output accuracy; used with external resistor dividers for precise 3.3V/5V/other rails |
| Power-Good Threshold | ±10% of FB voltage - provides reliable rail validation before system enable, with hysteresis for noise immunity |
| Operating Junction Temp | –40°C to 125°C - qualified for under-hood automotive and industrial control cabinet environments |
Pinout & Package
LT8616IFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP package (FE) with exposed GND pad (Pin 29) requiring PCB soldering for thermal management. θJA = 30°C/W, θJC(PAD) = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Main supply input for internal bias and CH1 top switch | Mandatory ≥3.4V even if only CH2 is active; local bypassing critical for stability |
| VIN2 | Input for CH2 top switch only | No minimum voltage requirement, but VIN1 must be ≥3.4V for CH2 operation |
| EN/UV1, EN/UV2 | Independent enable/undervoltage lockout inputs | 1.03V rising threshold with 50mV hysteresis; allows staged power-up and fault shutdown per rail |
| FB1, FB2 | Feedback inputs for CH1 and CH2 regulation | Regulated to 0.790V; connect resistor dividers to set output voltage; add 1.5–10pF phase-lead caps |
| PG1, PG2 | Open-drain power-good status outputs | Pull low until respective VOUT is within ±10% of target; require external pull-up resistors |
| TR/SS1, TR/SS2 | Soft-start and tracking control inputs | 2µA internal current source charges external capacitor; enables controlled ramp-up or output tracking |
| SYNC/MODE | Mode selection and synchronization input | GND = Burst Mode; ≥2.4V = pulse-skipping; external clock = synchronized operation |
| RT | Switching frequency programming input | Resistor to GND sets fSW from 200kHz to 3MHz; supports layout-optimized frequency selection |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables simultaneous 5V/1.5A and 3.3V/2.5A rails from single wide-input source without cross-regulation issues |
| 180° out-of-phase switching | Reduces RMS input capacitor ripple current by ~30% versus in-phase operation, lowering EMI and capacitor stress |
| Ultralow 6.5µA quiescent current | Extends battery runtime in always-on applications such as vehicle event data recorders and remote sensors |
| Internal compensation | Eliminates need for external compensation network, reducing BOM count and layout sensitivity |
| TSSOP-28 with exposed pad | Provides robust thermal path for 2.5A continuous output while maintaining standard surface-mount assembly compatibility |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering head unit MCU (5V), display interface (3.3V), and CAN transceiver (3.3V) from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Dual-output DC/DC regulator providing isolated, sequenced, and monitored 5V/3.3V rails with PG signaling for safe boot sequencing. Use Value: 42V absolute max rating withstands load-dump transients; 6.5µA IQ maintains backup RAM during ignition-off sleep mode. | Use Scenario: Powering low-power microcontroller, analog sensor front-end, and LoRaWAN radio in sealed outdoor environmental monitor. IC Role / Device Role / Timing Role: Primary power converter delivering regulated 3.3V/2.5A and auxiliary 5V/1.5A from long-life lithium-thionyl chloride battery or solar harvester. Use Value: 35ns min on-time supports high step-down ratio (e.g., 28V→3.3V) at 2MHz, enabling compact 2.2µH inductors and <10mm² solution size. |
| Medical Portable Diagnostic Device | Ruggedized Data Acquisition System |
Use Scenario: Generating clean, low-noise 3.3V for ADC/DAC and 5V for USB interface in handheld ultrasound probe. IC Role / Device Role / Timing Role: Dual-channel synchronous buck supplying precision analog and digital domains with independent soft-start and PG confirmation. Use Value: Low 15mVpp output ripple in Burst Mode ensures SNR integrity in 16-bit ADC measurements without additional LDO post-regulation. | Use Scenario: Powering FPGA core (1.2V via secondary regulator), I/O bank (3.3V), and Ethernet PHY (2.5V) in oilfield downhole telemetry controller. IC Role / Device Role / Timing Role: High-reliability primary regulator handling 36V nominal bus with transient overvoltage protection and thermal derating up to 125°C. Use Value: –40°C to 125°C operating range and TSSOP thermal design ensure uninterrupted operation in extreme ambient conditions. |
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 |
|---|---|---|---|
| LT8640SIFE#PBF | Single-channel, 6A output; higher current density; same 6.5µA IQ and 42V input; no CH2 or PG2 | Suitable only when single-rail high-current output suffices; lacks independent dual-rail control and tracking | Select when system requires >2.5A on one rail and space-constrained layout favors single IC over dual-channel solution |
| MPQ4420AGL-AEC1-P | Automotive-grade dual 2A buck; 17µA IQ; 3.3–36V input; no BIAS pin or TR/SS tracking; QFN-16 | Lower IQ penalty but no soft-start tracking or ultralow 6.5µA mode; AEC-Q200 qualified but narrower VIN range | Prefer for cost-sensitive automotive body electronics where AEC-Q200 compliance is mandatory and 6.5µA IQ is not required |
Compared with LT8640SIFE#PBF and MPQ4420AGL-AEC1-P, the LT8616IFE#PBF uniquely delivers true independent dual-rail control with tracking, sub-10µA quiescent current, and 42V input tolerance-making it optimal for systems requiring both ultra-low standby power and flexible multi-rail sequencing in harsh environments.
Availability
LT8616IFE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and portable medical diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8616IFE#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 and industrial qualification standards.
The LT8616IFE#PBF belongs to the LT86xx family of ultralow-IQ synchronous buck regulators designed specifically for always-on systems in automotive, industrial, and IoT edge devices where battery life and transient robustness are critical.
FAQ
What is the maximum input voltage rating for LT8616IFE#PBF?
The LT8616IFE#PBF has an absolute maximum input voltage rating of 42V on VIN1 and VIN2 pins. This allows direct connection to 24V industrial buses and 12V automotive systems with load-dump tolerance. Operation above 42V risks permanent damage; sustained operation should remain within the 3.4V–42V recommended range specified in the datasheet. The LT8616IFE#PBF includes internal overvoltage protection on these pins but does not clamp beyond absolute maximum ratings.
Does LT8616IFE#PBF support output voltage tracking between channels?
Yes, the LT8616IFE#PBF supports output voltage tracking using the TR/SS1 and TR/SS2 pins. By connecting a resistor divider from one output (e.g., VOUT1) to TR/SS2, Channel 2 can track Channel 1's startup ramp. Internal 2µA current sources charge external soft-start capacitors to generate controlled voltage ramps. The LT8616IFE#PBF regulates FBx to match TR/SSx voltage until it exceeds 0.790V, then transitions to fixed-reference regulation-enabling precise power sequencing in FPGAs and multicore processors.
How is the switching frequency set on LT8616IFE#PBF?
The switching frequency of LT8616IFE#PBF is set by an external resistor (RT) connected between the RT pin and ground. Values from 8.25kΩ (3MHz) to 221kΩ (200kHz) are supported, with precise values tabulated in the datasheet. The LT8616IFE#PBF also accepts external clock signals on the SYNC/MODE pin for synchronization across multiple converters, eliminating beat frequencies in dense power systems. Frequency remains stable across temperature and line/load variations due to internal oscillator calibration.
What thermal considerations apply to LT8616IFE#PBF in TSSOP-28 package?
The LT8616IFE#PBF in TSSOP-28 (FE) package has θJA = 30°C/W and θJC(PAD) = 10°C/W. The exposed GND pad (Pin 29) must be soldered to a thermal pad on the PCB for effective heat dissipation. For 2.5A continuous output at 12V→3.3V, junction temperature rise is ~35°C above ambient with 2-in² 2-oz copper; derating is required above 85°C ambient. The LT8616IFE#PBF includes thermal shutdown at ~165°C but is rated for continuous operation up to 125°C junction temperature.
Can LT8616IFE#PBF operate with only one channel enabled?
Yes, LT8616IFE#PBF supports independent channel enable/disable via EN/UV1 and EN/UV2 pins. Pulling EN/UV1 low disables Channel 1 while Channel 2 remains fully operational, and vice versa. When both pins are low, total quiescent current drops to 1.7µA. The LT8616IFE#PBF maintains full functionality-including PG status, soft-start, and frequency programming-for the active channel. VIN1 must remain ≥3.4V even when only Channel 2 is enabled.
LT8616IFE#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
LT8616IFE#PBF FAQ
1.How can I place an order for LT8616IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8616IFE#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 LT8616IFE#PBF reliable?
The price and inventory of LT8616IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8616IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8616IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8616IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8616IFE#PBF?
LT8616IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8616IFE#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 LT8616IFE#PBF?
For technical support, including LT8616IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8616IFE#PBF requirements.
6.How does Aetrix verify that LT8616IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8616IFE#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 LT8616IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8616IFE#PBF?
All LT8616IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8616IFE#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 LT8616IFE#PBF part is unused and in its original packaging.
Return procedure for LT8616IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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