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LT8610AHMSE-5#PBF

42V, 3.5A sync buck regulator, 5V fixed out, 2.5uA IQ, MSOP-16, -40 to 150C

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Manufacturer Part：

LT8610AHMSE-5#PBF

Package：

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

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Description

Product Overview

The LT8610AHMSE-5#PBF from Analog Devices is a 42 V, 3.5 A synchronous step-down regulator with a fixed 5 V output and ultralow 2.5 µA quiescent current. In a thermally enhanced 16-lead MSOP package rated for -40°C to +150°C, it features a 30 ns minimum switch-on time, 95% efficiency at 1 A from 12 V input, and adjustable switching frequency from 200 kHz to 2.2 MHz.

Key Specifications

Input Voltage Range 3.4 V to 42 V
Output Voltage 5 V (fixed)
Max Output Current 3.5 A
Quiescent Current (Burst Mode) 2.5 µA
Switching Frequency 200 kHz to 2.2 MHz (adjustable)
Min Switch-On Time 30 ns
Dropout Voltage 200 mV at 1 A
Efficiency 95% at 1 A, 5VOUT from 12VIN
Operating Temperature -40°C to +150°C (H-grade)
Package 16-MSOP with exposed pad

Features

  • Ultralow 2.5 µA IQ Burst Mode operation with output ripple below 10 mVp-p
  • Synchronous rectification eliminates external Schottky diode
  • 30 ns minimum switch-on time enables high step-down ratios
  • Accurate 1 V enable/undervoltage lockout threshold
  • Programmable soft-start via TR/SS capacitor
  • Power good output flag with +/-9% window
  • AEC-Q100 qualified for automotive applications

Applications

  • Automotive and industrial power supplies
  • General-purpose 5 V step-down conversion
  • Always-on battery-powered systems
  • GSM burst power supplies
  • Distributed power architectures

The LT8610AHMSE-5#PBF is a 42 V, 3.5 A synchronous monolithic step-down switching regulator from Analog Devices with a fixed 5 V output and an H-grade temperature rating of -40°C to +150°C. It features an ultralow 2.5 µA quiescent current in Burst Mode operation while regulating 12 V input to 5 V output, making it ideal for always-on battery-powered systems. The integrated top and bottom power switches provide synchronous rectification, achieving up to 95% efficiency at 1 A load from 12 V input. The fast 30 ns minimum switch-on time enables high step-down ratios even at high switching frequencies. The device supports adjustable switching frequency from 200 kHz to 2.2 MHz and can be synchronized to an external clock. Internal compensation with peak current mode control ensures stable operation with small inductors, while the accurate 1 V EN/UV threshold enables programmable undervoltage lockout.

The LT8610AHMSE-5 operates as a constant-frequency, peak current mode step-down (buck) converter. An internal oscillator sets the switching frequency between 200 kHz and 2.2 MHz based on the RT pin resistor. At each clock cycle, the integrated top NMOS switch turns on, ramping inductor current until the peak current comparator trips. The top switch then turns off and the synchronous bottom NMOS switch turns on, allowing inductor current to freewheel. The error amplifier compares a fraction of the output voltage (via the VFB pin) against a precision internal reference to set the peak current threshold. At light loads, Burst Mode operation is activated by tying SYNC low: switching pulses are delivered in bursts separated by sleep periods where all control circuitry is shut down, reducing IQ to just 2.5 µA. During overload, frequency foldback reduces the switching frequency to limit inductor current. The PG flag indicates when the output is within +/-9% of the target voltage.

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; programs output ramp rate
6 PG Output Power good flag (open-drain)
7 RT Analog Switching frequency set resistor to GND
8 SYNC Input Mode select: low = Burst Mode, high = pulse-skip, clock = sync
9 VFB Input Feedback voltage sense (connect to VOUT directly for 5 V fixed)
10 EN/UV Input Enable / undervoltage lockout (1 V threshold)
11 INTVCC Power Internal 3.4 V regulator output; decouple with 1 uF cap
12 VIN Power Input supply voltage (3.4 V to 42 V)
13 VIN Power Input supply voltage
14 NC – No connect
15 GND Ground Signal ground
16 GND Ground Signal ground
17 GND (EP) Ground Exposed pad; must be soldered to PCB ground
  • Automotive 12 V/24 V Battery Systems: 5 V supply for ECU microcontrollers and sensors from 12 V or 24 V nominal battery
  • Industrial Power Distribution: 5 V point-of-load conversion from 24 V or 36 V industrial bus
  • Always-On Systems: Battery-powered devices where 2.5 µA IQ minimizes standby drain
  • Post-Regulation: 5 V intermediate bus from 12 V or higher front-end supply
  • General-Purpose Step-Down: High-efficiency 5 V supply from wide-input-range sources
Model Manufacturer VIN IOUT VOUT IQ Package Notes
LT8610AIMSE-5#PBF Analog Devices 3.4-42 V 3.5 A 5 V 2.5 µA MSOP-16 I-grade (-40 to 125C)
LT8610ABHMSE-5#PBF Analog Devices 3.4-42 V 3.5 A 5 V 2.5 µA MSOP-16 Improved Burst efficiency
LTM8020MPV Analog Devices 3.4-36 V 1 A Adj 5 µA BGA-25 uModule, lower current
TPS54061DRBR Texas Instruments 4.7-60 V 0.5 A Adj 0.9 µA VSON-8 Lower current, wider VIN
MAX17503ATC+ Analog Devices 4.5-60 V 2.5 A Adj 3.1 µA TDFN-12 Wider input range
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