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LT8620EMSE#TRPBF

65V, 2A sync buck regulator, adj output, 2.5uA IQ, 2.2MHz, MSOP-16

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Manufacturer Part：

LT8620EMSE#TRPBF

Package：

MSOP-16 with exposed pad (5.00 x 4.40 x 0.90 mm body)

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Description

Product Overview

The LT8620EMSE#TRPBF from Analog Devices is a 65 V, 2 A synchronous step-down regulator with ultralow 2.5 µA quiescent current in a 16-lead MSOP package. With an adjustable output from 0.97 V to 64.75 V, switching frequency from 200 kHz to 2.2 MHz, and 94% peak efficiency, it is designed for automotive, industrial, and general-purpose step-down power conversion.

Key Specifications

Input Voltage Range 3.4 V to 65 V
Output Voltage 0.97 V to 64.75 V (adjustable)
Max Output Current 2 A
Quiescent Current (Burst Mode) 2.5 µA
Switching Frequency 200 kHz to 2.2 MHz (adjustable)
Efficiency 94% at 1 A, 12VIN to 5VOUT
Dropout 250 mV at 1 A
Operating Temperature -40°C to +125°C (E-grade)
Package 16-MSOP with exposed pad

Features

  • Wide 65 V input range for automotive and industrial applications
  • 2.5 µA IQ Burst Mode with output ripple below 10 mVp-p
  • Synchronous operation eliminates external Schottky diode
  • Fast 30 ns minimum switch-on time
  • Accurate 1 V enable/UVLO threshold
  • Internal compensation and programmable soft-start
  • PG flag with +/-9% output window

Applications

  • Automotive and industrial power supplies
    • GSM burst power supplies
  • General-purpose step-down from high-voltage rails
  • Distributed power architectures
  • Battery-powered always-on systems

The LT8620EMSE#TRPBF is a 65 V, 2 A synchronous monolithic step-down switching regulator from Analog Devices with an adjustable output voltage from 0.97 V to 64.75 V. Accepting input voltages up to 65 V, it targets automotive, industrial, and telecom power applications. The integrated top and bottom power switches provide synchronous rectification, achieving up to 94% efficiency at 1 A from 12 V input. The ultralow 2.5 µA quiescent current in Burst Mode preserves battery life in always-on systems. The switching frequency is adjustable from 200 kHz to 2.2 MHz via an external resistor and can be synchronized to an external clock. Internal compensation with peak current mode control ensures stable operation with small inductors. The 30 ns minimum switch-on time enables high step-down ratios even at high frequencies. An accurate 1 V EN/UV threshold supports programmable undervoltage lockout, and the PG flag signals when the output is within +/-9% of the target. The E-grade device is rated for -40°C to +125°C.

The LT8620 operates as a constant-frequency, peak current mode synchronous buck converter. At each clock cycle, the top NMOS power switch turns on and inductor current ramps up until the peak current comparator trips, at which point the top switch turns off and the synchronous bottom NMOS switch turns on to allow inductor current to freewheel. The error amplifier compares the VFB pin voltage against a 0.97 V internal reference and adjusts the VC node to control the peak inductor current threshold. At light loads with SYNC low, Burst Mode operation delivers switching pulses in short bursts separated by sleep periods where all switching circuitry is shut down, reducing IQ to 2.5 µA. The BIAS pin can be connected to VOUT (3.3 V or above) to improve efficiency by powering internal circuitry from the output. Frequency foldback reduces the switching frequency during overload and startup to protect the inductor. The EN/UV pin with its precise 1 V threshold enables programmable input UVLO while reducing input current to 1 µA when disabled.

Pin Name Type Function
1 BST Power Bootstrap capacitor for top switch driver
2 SW Output Switch node (inductor connection)
3 SW Output Switch node (inductor connection)
4 BIAS Input Internal regulator supply; connect to VOUT if >= 3.3 V
5 TR/SS Analog Soft-start capacitor for output ramp control
6 PG Output Power good flag (open-drain)
7 RT Analog Frequency set resistor to GND
8 SYNC Input Mode select: low = Burst, high = pulse-skip, clock = sync
9 VFB Input Feedback voltage sense (0.97 V reference)
10 EN/UV Input Enable / undervoltage lockout (1 V threshold)
11 INTVCC Power Internal regulator decoupling
12 VIN Power Input supply (3.4 V to 65 V)
13 VIN Power Input supply
14 NC – No connect
15 GND Ground Signal ground
16 GND Ground Signal ground
17 GND (EP) Ground Exposed pad; solder to PCB ground
  • Automotive 48 V/12 V Systems: Step-down from 48 V or 12 V battery to logic and sensor supply rails
  • Industrial 24 V/36 V Bus: Point-of-load conversion from industrial distribution bus
  • Telecom Power

    : -48 V (72 V max) to low-voltage conversion in telecom equipment

  • Always-On Battery Systems: Ultra-low IQ standby mode for battery-powered instrumentation
  • General-Purpose Step-Down: High-efficiency conversion from unregulated or wide-range input sources
Model Manufacturer VIN IOUT IQ Package Notes
LT8620IMSE#TRPBF Analog Devices 3.4-65 V 2 A 2.5 µA MSOP-16 I-grade, -40 to 125C
LT8610AEMSE#TRPBF Analog Devices 3.4-42 V 3.5 A 2.5 µA MSOP-16 Higher current, lower VIN
LTC3646EMSE#TRPBF Analog Devices 3.1-34 V 3 A 1.7 µA MSOP-16 Lower VIN, higher IOUT
TPS54060DRBR Texas Instruments 4.5-60 V 0.5 A 0.9 µA VSON-8 Ultra-low IQ, lower current
MAX17503ATC+ Analog Devices 4.5-60 V 2.5 A 3.1 µA TDFN-12 Wider VIN, different package
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