Datasheet Linear Technology LT8611

Manufacturer	Linear Technology
Series	LT8611

42V, 2.5A Synchronous Step-Down Regulator with Current Sense and 2.5µA Quiescent Current

Datasheets

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PDF, 343 Kb, Language: en, File uploaded: Sep 19, 2017, Pages: 26
42V, 2.5A Synchronous Step-Down Regulator with Current Sense and 2.5μA Quiescent Current

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Prices

Packaging

	LT8611EUDD#PBF	LT8611EUDD#TRPBF	LT8611IUDD#PBF	LT8611IUDD#TRPBF
N	1	2	3	4
Package	3x5 QFN-24 Package Outline Drawing	3x5 QFN-24 Package Outline Drawing	3x5 QFN-24 Package Outline Drawing	3x5 QFN-24 Package Outline Drawing
Package Code	UDD	UDD	UDD	UDD
Package Index	05-08-1833	05-08-1833	05-08-1833	05-08-1833
Pin Count	24	24	24	24

Parametrics

Parameters / Models	LT8611EUDD#PBF	LT8611EUDD#TRPBF	LT8611IUDD#PBF	LT8611IUDD#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC1750A	DC1750A	DC1750A	DC1750A
Design Tools	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model
Export Control	no	no	no	no
Features	Burst Mode, Resistor Set Frequency, External Synchronization, Tracking, Rail-to-Rail Current Sense Amplifier, Output Current Monitor	Burst Mode, Resistor Set Frequency, External Synchronization, Tracking, Rail-to-Rail Current Sense Amplifier, Output Current Monitor	Burst Mode, Resistor Set Frequency, External Synchronization, Tracking, Rail-to-Rail Current Sense Amplifier, Output Current Monitor	Burst Mode, Resistor Set Frequency, External Synchronization, Tracking, Rail-to-Rail Current Sense Amplifier, Output Current Monitor
Frequency, kHz	2200	2200	2200	2200
Ishutdown, µA	1	1	1	1
Isupply, mA	0.0024	0.0024	0.0024	0.0024
Monolithic	yes	yes	yes	yes
Number of Outputs	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 85	-40 to 85
Output Current, A	2.5	2.5	2.5	2.5
Switch Current, A	4.8	4.8	4.8	4.8
Synchronous	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck
Vin Max, V	42	42	42	42
Vin Min, V	3.4	3.4	3.4	3.4
Vout Max, V	40	40	40	40

Eco Plan

	LT8611EUDD#PBF	LT8611EUDD#TRPBF	LT8611IUDD#PBF	LT8611IUDD#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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42V, 2.5A Synchronous Step-Down Regulator with 2.5ОјA Quiescent Current &mdash DN504
PDF, 97 Kb, File published: May 30, 2012
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42V, 2.5A Synchronous Step-Down Regulator with 2.5ВµA
Quiescent Current
Design Note 504
Hua (Walker) Bai
Introduction
The LTВ®8610 and LT8611 are 42V, 2.5A synchronous
step-down regulators that meet the stringent high
input voltage and low output voltage requirements of
automotive, industrial and communications applications. To minimize external components and solution
size, the top and bottom power switches are integrated
in a synchronous regulator topology, including internal
compensation. The regulator consumes only 2.5ОјA
quiescent current from the input source even while
regulating the output.
High Efп¬Ѓciency Synchonous Operation
Replacing an external Schottky diode with an internal
synchronous power switch not only minimizes the solution size, but also increases efп¬Ѓciency and reduces power
dissipation. The efп¬Ѓciency improvement is signiп¬Ѓcant
in low output voltage applications where the voltage
drop of the Schottky diode represents a relatively large
portion of the output voltage. Figure 1 shows a 12V
to 3.3V circuit. Figure 2 shows the efп¬Ѓciency of this
circuit reaching 94%, which is 5% to 10% higher than …

Model Line

Series: LT8611 (4)

LT8611EUDD#PBF LT8611EUDD#TRPBF LT8611IUDD#PBF LT8611IUDD#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Micropower Buck Regulators | Internal Power Switch Buck | High Input Voltage Buck
Power Management > LED Driver ICs > Step-Down (Buck) LED Drivers