Datasheet Linear Technology LT3509

Manufacturer	Linear Technology
Series	LT3509

Dual 36V, 700mA Step-Down Regulator

Datasheets

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PDF, 328 Kb, Language: en, File uploaded: Sep 18, 2017, Pages: 24
Dual 36V, 700mA Step-Down Regulator

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Prices

Packaging

	LT3509EDE#PBF	LT3509EDE#TRPBF	LT3509EMSE#PBF	LT3509EMSE#TRPBF	LT3509HMSE#PBF	LT3509HMSE#TRPBF	LT3509IDE#PBF	LT3509IDE#TRPBF	LT3509IMSE#PBF	LT3509IMSE#TRPBF
N	1	2	3	4	5	6	7	8	9	10
Package	4x3 DFN-14 Package Outline Drawing	4x3 DFN-14 Package Outline Drawing	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing	4x3 DFN-14 Package Outline Drawing	4x3 DFN-14 Package Outline Drawing	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing
Package Code	DE	DE	MSE	MSE	MSE	MSE	DE	DE	MSE	MSE
Package Index	05-08-1708	05-08-1708	05-08-1667	05-08-1667	05-08-1667	05-08-1667	05-08-1708	05-08-1708	05-08-1667	05-08-1667
Pin Count	14	14	16	16	16	16	14	14	16	16

Parametrics

Parameters / Models	LT3509EDE#PBF	LT3509EDE#TRPBF	LT3509EMSE#PBF	LT3509EMSE#TRPBF	LT3509HMSE#PBF	LT3509HMSE#TRPBF	LT3509IDE#PBF	LT3509IDE#TRPBF	LT3509IMSE#PBF	LT3509IMSE#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	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC1248A	DC1248A	DC1248A	DC1248A	DC1248A	DC1248A	DC1248A	DC1248A	DC1248A	DC1248A
Design Tools	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model
Export Control	no	no	no	no	no	no	no	no	no	no
Features	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization	Overvoltage Protection, Resistor Set Frequency, External Synchronization
Frequency, kHz	2200	2200	2200	2200	2200	2200	2200	2200	2200	2200
Frequency Adjust Range	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz
Frequency Sync Range	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz	300kHz - 2.2MHz
Integrated Inductor	no	no	no	no	no	no	no	no	no	no
Ishutdown, µA	9	9	9	9	9	9	9	9	9	9
Isupply, mA	1.9	1.9	1.9	1.9	1.9	1.9	1.9	1.9	1.9	1.9
Max Phases	1	1	1	1	1	1	1	1	1	1
Monolithic	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
Number of Outputs	2	2	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 125	-40 to 125	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Output Current, A	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7
Output Current 2, A	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7
Over Voltage Protection, V	60	60	60	60	60	60	60	60	60	60
Polyphase	no	no	no	no	no	no	no	no	no	no
Switch Current, A	1.4	1.4	1.4	1.4	1.4	1.4	1.4	1.4	1.4	1.4
Switch Current 2, A	1.4	1.4	1.4	1.4	1.4	1.4	1.4	1.4	1.4	1.4
Synchronous	no	no	no	no	no	no	no	no	no	no
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Vin Max, V	36	36	36	36	36	36	36	36	36	36
Vin Min, V	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6	3.6
Vout Max, V	35.28	35.28	35.28	35.28	35.28	35.28	35.28	35.28	35.28	35.28
Vout Maximum	0.98Vin	0.98Vin	0.98Vin	0.98Vin	0.98Vin	0.98Vin	0.98Vin	0.98Vin	0.98Vin	0.98Vin
Vout Min, V	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
Vout Min 2, V	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
Vref Accuracy Over Temp, %	2	2	2	2	2	2	2	2	2	2

Eco Plan

	LT3509EDE#PBF	LT3509EDE#TRPBF	LT3509EMSE#PBF	LT3509EMSE#TRPBF	LT3509HMSE#PBF	LT3509HMSE#TRPBF	LT3509IDE#PBF	LT3509IDE#TRPBF	LT3509IMSE#PBF	LT3509IMSE#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Articles

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Easy Automotive Power Supplies: Compact Regulator Produces Dual Outputs as Low as 0.8V from 3.6V-36V and is Unfazed by 60V Transients &mdash LT Journal
PDF, 623 Kb, File published: Jan 1, 2009
Extract from the document
LвЂ‰DESIGN IDEAS Easy Automotive Power Supplies:
Compact Regulator Produces Dual
Outputs as Low as 0.8V from 3.6VвЂ“36V
and is Unfazed by 60V Transients
by Peter J. Andrews Introduction
The LT3509 dual channel step-down
regulator operates over an impressively vast supply range of 3.6V to more
than 36V, but its real distinguishing
feature is its ability to handily protect
both itself and downstream components from transient input voltages
up to 60V. It accomplishes this by
entering a safe shutdown mode when
the supply exceeds 38V, such as load
dump events in automotive electrical
systems.
In a vehicle electrical system,
overvoltage transients can occur when
heavy loads are switched because the
rapid change in current across the wiring inductance induces a high voltage.
These transients are usually short in
duration, from several microseconds to
several milliseconds. Longer duration
voltage surges can happen when the …

Model Line

Series: LT3509 (10)

LT3509EDE#PBF LT3509EDE#TRPBF LT3509EMSE#PBF LT3509EMSE#TRPBF LT3509HMSE#PBF LT3509HMSE#TRPBF LT3509IDE#PBF LT3509IDE#TRPBF LT3509IMSE#PBF LT3509IMSE#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | Internal Power Switch Buck
Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators