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Analog Devices Inc. LT8616IFE#TRPBF
- Part No.:
- LT8616IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8616IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,528
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Product details
Overview
LT8616IFE#TRPBF 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 systems requiring ultra-low IQ and high reliability under wide temperature variation.
For engineers reviewing the LT8616IFE#TRPBF datasheet, LT8616IFE#TRPBF pinout, LT8616IFE#TRPBF application, or LT8616IFE#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed dual-buck operation parameters, and real-world design implications for industrial and automotive DC/DC conversion.
Technical Context
The LT8616IFE#TRPBF integrates two independent peak-current-mode buck regulators sharing internal bias circuitry but featuring separate VIN1/VIN2 inputs, EN/UV control, PG status, TR/SS soft-start, and FB feedback paths. 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.
It operates in three modes: low-ripple Burst Mode (6.5µA IQ, synchronized 180° out-of-phase switching), pulse-skipping mode (300–1000µA IQ), or external clock synchronization (250kHz–3MHz). Internal compensation, 0.790V FB reference, and 1V EN/UV thresholds enable stable regulation without external loop components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports direct connection to 12V/24V automotive batteries with cold-crank margin. |
| Quiescent Current | 6.5µA with both channels enabled in Burst Mode - enables always-on systems with multi-year battery life. |
| Output Current Capability | Channel 1: 1.5A; Channel 2: 2.5A - allows asymmetric rail generation (e.g., 5V MCU + 3.3V FPGA I/O). |
| Minimum Switch On-Time | 35ns - enables high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse skipping. |
| Switching Frequency Range | 200kHz to 3MHz (programmable via RT resistor) - balances efficiency vs. component size for space-constrained designs. |
| FB Reference Voltage | 0.790V ±12mV - sets output accuracy; enables precise 3.3V/5V rails using standard 1% resistors. |
| Power-Good Threshold | ±10% of VFB - provides reliable rail monitoring for system sequencing and fault detection. |
Pinout & Package
LT8616IFE#TRPBF is packaged in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed GND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 30°C/W, θJC(PAD) = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Primary input supply for Channel 1 and internal bias circuits | Mandatory ≥3.4V even if only Channel 2 is active; powers INTVCC and common logic. |
| VIN2 | Dedicated input for Channel 2 high-side switch | Enables independent input sourcing; no minimum voltage if VIN1 ≥3.4V. |
| EN/UV1, EN/UV2 | Independent enable/undervoltage lockout inputs | 1.03V rising threshold with 50mV hysteresis - allows programmable UVLO using resistor dividers. |
| FB1, FB2 | Feedback inputs for output voltage regulation | Regulated to 0.790V; connects to resistor divider taps - determines VOUT accuracy and stability. |
| PG1, PG2 | Open-drain power-good status outputs | Pull low until respective output is within ±10% of target - used for system power sequencing and fault signaling. |
| TR/SS1, TR/SS2 | Soft-start and tracking control inputs | 2µA internal current source charges external capacitor - controls startup ramp rate and enables output tracking. |
| SYNC/MODE | Mode selection and external clock input | GND = Burst Mode; ≥2.4V = pulse-skipping; AC signal = synchronization - selects noise/efficiency trade-off. |
| SW1, SW2 | Switch node outputs | Connect to inductors and BOOST capacitors - high di/dt nodes requiring tight layout and minimal trace area. |
| BOOST1, BOOST2 | Floating gate-drive supplies for top FETs | 0.1µF ceramic caps required between BOOSTx and SWx - critical for efficient high-side switching. |
| BIAS | External bias supply input | Connect to ≥3.1V output (e.g., VOUT2) to reduce IQ; bypass with 1µF capacitor if sourced externally. |
| RT | Resistor-programmed oscillator frequency input | Grounded resistor sets fSW from 200kHz–3MHz - enables optimization for EMI, size, or efficiency. |
| GND | Signal and power ground reference | All GND pins and exposed pad must be connected to low-impedance ground plane - essential for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 6.5µA total with both channels regulating - extends battery runtime in always-on telematics and ADAS modules. |
| 180° out-of-phase switching | Reduces input ripple current by ~70% vs. in-phase operation - lowers required input capacitance and EMI filtering. |
| Internal compensation | Eliminates external compensation network - simplifies design, improves production yield, and ensures stability across operating conditions. |
| Accurate 1V enable thresholds | EN/UV pins with 1.03V rising / 0.98V falling thresholds - enables precise, repeatable power sequencing without external comparators. |
| Output soft-start and tracking | TR/SS pins support independent or coordinated startup - prevents inrush current and satisfies FPGA/CPU power-rail sequencing requirements. |
| TSSOP package with exposed pad | 28-lead FE package with soldered GND pad - achieves θJA = 30°C/W for reliable 2.5A operation at 125°C ambient. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC Dual-Rail Converter |
|---|---|
Use Scenario: Powering head unit SoC (5V core) and display interface (3.3V I/O) from 12V battery with cold-crank tolerance down to 3.4V. IC Role / Device Role / Timing Role: Dual synchronous buck regulator delivering isolated, sequenced, and monitored 5V/1.5A and 3.3V/2.5A rails. Use Value: 6.5µA IQ enables parking-mode operation for weeks; 42V absolute max rating survives load-dump transients. | Use Scenario: Generating 5V logic and 3.3V communication rails in DIN-rail mounted PLC with wide-input 24VDC field supply. IC Role / Device Role / Timing Role: Monolithic dual-buck controller providing independent enable, soft-start, and power-good signaling per rail. Use Value: 35ns min on-time supports 24V→3.3V conversion at 2MHz, reducing inductor size by >40% vs. 500kHz solutions. |
| Medical Portable Monitor Power | Test Equipment Auxiliary Supply |
Use Scenario: Battery-powered patient monitor requiring low-noise, always-on 3.3V sensor rail and pulsed 5V display backlight driver. IC Role / Device Role / Timing Role: Dual-channel regulator with Burst Mode for standby and pulse-skipping for active display mode. Use Value: Seamless mode transition maintains <15mV output ripple in Burst Mode while enabling fast transient response during backlight pulses. | Use Scenario: Benchtop instrument needing clean, independently controllable 5V and 3.3V rails for DUT power and internal logic. IC Role / Device Role / Timing Role: Dual-buck IC with individual EN/UV and PG pins enabling software-controlled rail sequencing and fault isolation. Use Value: Independent shutdown and power-good reporting allow automated test sequences to verify rail integrity before DUT activation. |
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 with configurable 1–4 channel paralleling; higher integration but larger QFN package; 2.5µA IQ. | Targets multi-rail, lower-current systems (≤1A/rail); lacks 42V rating and 2.5A single-channel capability. | Select LTC3375 when >2 rails or fine-grained current allocation is needed; avoid for 2.5A loads or 42V input. |
| TPS6521905RGER | Single-chip PMIC with dual 3A bucks, integrated LDOs, and fuel gauge; 12µA IQ; 5.5V max input. | Designed for portable battery-powered devices (not automotive/industrial); no 42V tolerance or independent VIN inputs. | Select TPS65219 for compact battery-powered systems with mixed analog/digital rails; not suitable for 12V/24V/42V inputs. |
Compared with LTC3375EFE#PBF and TPS6521905RGER, LT8616IFE#TRPBF uniquely combines 42V input tolerance, true 2.5A channel capability, and 6.5µA IQ in a single dual-buck IC-making it optimal for ruggedized, wide-input, asymmetric-rail applications where reliability and ultra-low standby power are critical.
Availability
LT8616IFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and medical portable monitors requiring stable component supply, long-term lifecycle assurance, and AEC-Q200-aligned reliability.
Supply support for LT8616IFE#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 its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LT8616IFE#TRPBF belongs to the LT86xx family of ultralow-IQ synchronous monolithic buck regulators, designed specifically for always-on systems in automotive, industrial, and medical applications demanding wide input range and exceptional light-load efficiency.
FAQ
What is the guaranteed operating junction temperature range for LT8616IFE#TRPBF?
The LT8616IFE#TRPBF is an Industrial-grade part with guaranteed operation from –40°C to +125°C junction temperature. Its absolute maximum junction temperature is 150°C, and thermal shutdown activates above this threshold to protect the device. The exposed pad (Pin 29) must be soldered to the PCB ground plane to achieve the specified θJA = 30°C/W and ensure reliable operation at full load across the rated temperature range.
How does LT8616IFE#TRPBF achieve 6.5µA quiescent current with both channels enabled?
The LT8616IFE#TRPBF achieves 6.5µA total IQ by combining deep sleep in Burst Mode (3µA base), optimized gate drive, and shared bias circuitry. In Burst Mode, both channels deliver discrete energy packets to maintain regulation, then enter extended sleep periods where most internal circuitry is powered down. The 1.7µA drawn from VIN1 powers common bias blocks, while each channel contributes ~2.4µA reflected through its feedback divider - totaling 6.5µA for typical 3.3V/5V outputs with 1MΩ dividers.
Can LT8616IFE#TRPBF operate with only VIN2 connected and VIN1 unpowered?
No. LT8616IFE#TRPBF requires VIN1 ≥3.4V to operate any channel, including Channel 2. VIN1 supplies internal bias (INTVCC), common logic, and Channel 1's high-side switch. Even when only Channel 2 is active, VIN1 must be present and meet the minimum voltage requirement. VIN2 is optional for Channel 2 but provides improved efficiency when used; if omitted, Channel 2 draws high-side current from VIN1.
What is the function of the BIAS pin on LT8616IFE#TRPBF, and how should it be connected?
The BIAS pin on LT8616IFE#TRPBF supplies the internal regulator when biased ≥3.1V, reducing IQ by shifting bias current from VIN1. For 3.3V or higher outputs, connect BIAS directly to the appropriate VOUT (e.g., VOUT2). If connected to an external supply, bypass with a 1µF low-ESR ceramic capacitor. Leaving BIAS unconnected or grounding it disables the BIAS path, forcing all bias current to be drawn from VIN1 - increasing total IQ by ~7mA under full load.
Does LT8616IFE#TRPBF support independent output voltage sequencing, and how is it implemented?
Yes. LT8616IFE#TRPBF supports independent sequencing via TR/SS1 and TR/SS2 pins. Each pin sources a constant 2µA current to charge an external capacitor, generating a controlled voltage ramp. Regulation follows the TR/SS voltage until it exceeds 0.790V, after which the internal reference resumes control. By selecting different capacitor values or applying external ramps (e.g., from another regulator's output), designers can delay one channel's startup relative to the other - satisfying strict FPGA, CPU, or ASIC power-rail sequencing requirements without additional ICs.
LT8616IFE#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
LT8616IFE#TRPBF FAQ
1.How can I place an order for LT8616IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8616IFE#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 LT8616IFE#TRPBF reliable?
The price and inventory of LT8616IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8616IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8616IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8616IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8616IFE#TRPBF?
LT8616IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8616IFE#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 LT8616IFE#TRPBF?
For technical support, including LT8616IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8616IFE#TRPBF requirements.
6.How does Aetrix verify that LT8616IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8616IFE#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 LT8616IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8616IFE#TRPBF?
All LT8616IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8616IFE#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 LT8616IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8616IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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