Overview
The LT8616EFE#TRPBF, produced by Analog Devices Inc., is a high-efficiency, high-speed, dual synchronous monolithic step-down switching regulator. This device is designed to consume only 6.5µA of quiescent current when both channels are enabled, making it highly efficient for various power management applications. The LT8616 features two independent buck regulators with separate inputs, each capable of delivering 2.5A and 1.5A, respectively. It operates over a wide input voltage range of 3.4V to 42V, making it suitable for automotive and industrial supplies as well as general-purpose step-down applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Voltage Range | 3.4 | 42 | V | ||
| Output Current (Channel 1) | 2.5 | A | |||
| Output Current (Channel 2) | 1.5 | A | |||
| Quiescent Current | EN/UV1 = EN/UV2 = 0V | 1.7 | 1.7 | 4.0 | µA |
| Quiescent Current | EN/UV1 = EN/UV2 = 2V, SYNC = 0V (Burst Mode) | 3.0 | 3.0 | 5.0 | µA |
| Minimum Switch On-Time | Load = 0.25A, Pulse-Skipping Mode | 20 | 35 | 55 | ns |
| SW1 Peak Current Limit | 3.2 | 4.2 | 5.2 | A | |
| SW1 Top NMOS On-Resistance | 310 | mΩ | |||
| SW1 Bottom NMOS On-Resistance | 190 | mΩ | |||
| Feedback Voltage | VIN = 6V, Load = 0.5A | 782 | 778 | 790 | mV |
| Feedback Voltage Line Regulation | VIN = 4V to 25V, Load = 0.5A | 0.005 | %/V |
Key Features
- High efficiency with low quiescent current of 6.5µA in Burst Mode operation.
- Dual synchronous monolithic step-down regulators with separate inputs for 2.5A and 1.5A outputs.
- Wide input voltage range of 3.4V to 42V.
- Fast minimum switch on-time of 35ns.
- Low ripple Burst Mode operation with output ripple < 15mV.
- 180° out of phase switching to reduce input ripple.
- Adjustable switching frequency from 200kHz to 3MHz and synchronizable from 250kHz to 3MHz.
- Internal compensation and peak current mode topology for fast transient response and good loop stability.
- Accurate 1V enable pin thresholds and programmable undervoltage lockout.
- Output soft-start and tracking capabilities.
- Thermally enhanced 28-lead TSSOP and 3mm × 6mm QFN packages.
Applications
- Automotive supplies: Suitable for automotive systems due to its wide input voltage range and high reliability.
- Industrial supplies: Ideal for industrial applications requiring high efficiency and low quiescent current.
- General-purpose step-down applications: Can be used in various general-purpose power management scenarios.
- Other applications: Applicable in battery-powered devices, embedded systems, and any system requiring efficient power conversion.
Q & A
- What is the input voltage range of the LT8616?
The input voltage range of the LT8616 is from 3.4V to 42V.
- What are the output current capabilities of the LT8616?
The LT8616 can deliver 2.5A on one channel and 1.5A on the other channel.
- What is the quiescent current of the LT8616 in Burst Mode operation?
The quiescent current in Burst Mode operation is 6.5µA.
- What is the minimum switch on-time of the LT8616?
The minimum switch on-time is 35ns.
- Can the LT8616 be synchronized with an external clock?
Yes, the LT8616 has a SYNC pin that allows synchronization to an external clock from 250kHz to 3MHz.
- What are the package options for the LT8616?
The LT8616 is available in thermally enhanced 28-lead TSSOP and 3mm × 6mm QFN packages.
- What is the feedback voltage line regulation of the LT8616?
The feedback voltage line regulation is 0.005%/V over the input voltage range from 4V to 25V.
- Does the LT8616 support output soft-start and tracking?
Yes, the LT8616 supports output soft-start and tracking.
- What are the typical applications of the LT8616?
The LT8616 is typically used in automotive supplies, industrial supplies, and general-purpose step-down applications.
- What is the on-resistance of the top and bottom NMOS switches in the LT8616?
The top NMOS on-resistance is 310mΩ, and the bottom NMOS on-resistance is 190mΩ.
