Datasheet Linear Technology LT3640

Manufacturer	Linear Technology
Series	LT3640

Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer

Datasheets

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PDF, 523 Kb, Language: en, File uploaded: Sep 18, 2017, Pages: 24
Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer

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Packaging

	LT3640EFE#PBF	LT3640EFE#TRPBF	LT3640EUFD#PBF	LT3640EUFD#TRPBF	LT3640IFE#PBF	LT3640IFE#TRPBF	LT3640IUFD#PBF	LT3640IUFD#TRPBF
N	1	2	3	4	5	6	7	8
Package	TSSOP-28 Package Outline Drawing	TSSOP-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	TSSOP-28 Package Outline Drawing	TSSOP-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing
Package Code	FE	FE	UFD	UFD	FE	FE	UFD	UFD
Package Index	05-08-1663 (EB)	05-08-1663 (EB)	05-08-1712	05-08-1712	05-08-1663 (EB)	05-08-1663 (EB)	05-08-1712	05-08-1712
Pin Count	28	28	28	28	28	28	28	28

Parametrics

Parameters / Models	LT3640EFE#PBF	LT3640EFE#TRPBF	LT3640EUFD#PBF	LT3640EUFD#TRPBF	LT3640IFE#PBF	LT3640IFE#TRPBF	LT3640IUFD#PBF	LT3640IUFD#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC1359A	DC1359A	DC1359A	DC1359A	DC1359A	DC1359A	DC1359A	DC1359A
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File
Export Control	no	no	no	no	no	no	no	no
Features	Power On Reset, Burst Mode, Watchdog Timer, Resistor Set Frequency, External Synchronization, Power Good	Power On Reset, Burst Mode, Watchdog Timer, Resistor Set Frequency, External Synchronization, Power Good	Power On Reset, Burst Mode, Watchdog Timer, Resistor Set Frequency, External Synchronization, Power Good	Power On Reset, Burst Mode, Watchdog Timer, Resistor Set Frequency, External Synchronization, Power Good	Power On Reset, Burst Mode, Watchdog Timer, Resistor Set Frequency, External Synchronization, Power Good	Power On Reset, Burst Mode, Watchdog Timer, Resistor Set Frequency, External Synchronization, Power Good	Power On Reset, Burst Mode, Watchdog Timer, Resistor Set Frequency, External Synchronization, Power Good	Power On Reset, Burst Mode, Watchdog Timer, Resistor Set Frequency, External Synchronization, Power Good
Frequency, kHz	2500	2500	2500	2500	2500	2500	2500	2500
Frequency Adjust Range	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz
Frequency Sync Range	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz	350kHz - 2.5MHz
Integrated Inductor	no	no	no	no	no	no	no	no
Ishutdown, µA	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
Isupply, mA	0.275	0.275	0.275	0.275	0.275	0.275	0.275	0.275
Max Phases	1	1	1	1	1	1	1	1
Monolithic	yes	yes	yes	yes	yes	yes	yes	yes
Number of Outputs	2	2	2	2	2	2	2	2
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85	0 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Output Current, A	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3
Output Current 2, A	1	1	1	1	1	1	1	1
Over Voltage Protection, V	55	55	55	55	55	55	55	55
Polyphase	no	no	no	no	no	no	no	no
Switch Current, A	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8
Switch Current 2, A	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Vin Max, V	35	35	35	35	35	35	35	35
Vin Min, V	4	4	4	4	4	4	4	4
Vout Max, V	33.97	33.97	33.97	33.97	33.97	33.97	33.97	33.97
Vout Maximum	0.97Vin	0.97Vin	0.97Vin	0.97Vin	0.97Vin	0.97Vin	0.97Vin	0.97Vin
Vout Min, V	1.265	1.265	1.265	1.265	1.265	1.265	1.265	1.265
Vout Min 2, V	0.6	0.6	0.6	0.6	0.6	0.6	0.6	0.6
Vref Accuracy Over Temp, %	2	2	2	2	2	2	2	2

Eco Plan

	LT3640EFE#PBF	LT3640EFE#TRPBF	LT3640EUFD#PBF	LT3640EUFD#TRPBF	LT3640IFE#PBF	LT3640IFE#TRPBF	LT3640IUFD#PBF	LT3640IUFD#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Articles

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2MHz Dual Buck Regulator Operates Outside of AM Radio Band When Delivering 3.3V and 1.8V from 16V Input &mdash LT Journal
PDF, 723 Kb, File published: Apr 1, 2010
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2MHz Dual Buck Regulator Operates Outside of AM Radio
Band When Delivering 3.3V and 1.8V from 16V Input
Pit-Leong Wong The number of microprocessor-based control units continues
to grow in both automobiles and industrial systems. Because
the amount of required processing power is also increasing,
even modest processors require a low voltage core supply
in addition to 3.3V or 5V memory, I/O and analog supplies.
In automotive systems, power comes
from the battery, with its voltage typically between 9V and 16V. Including cold
crank and double battery jump-starts, the
minimum input voltage may be as low
as 4V and the maximum up to 36V, with
even higher transient voltages. Likewise,
a 24V industrial supply may be as high
as 32V. With these high input voltages,
linear regulators cannot be used for supply currents greater than 200mA without
overheating the regulator. Instead, high
efficiency switching regulators must be
used to minimize thermal dissipation.
There are challenges in applying switching regulators in these systems. A small
circuit is desired, and certain operating
frequencies may be unacceptable. At
high step-down ratios, switching regulators typically operate at frequencies in …

Model Line

Series: LT3640 (8)

LT3640EFE#PBF LT3640EFE#TRPBF LT3640EUFD#PBF LT3640EUFD#TRPBF LT3640IFE#PBF LT3640IFE#TRPBF LT3640IUFD#PBF LT3640IUFD#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | Internal Power Switch Buck