Datasheet Linear Technology LT3685

Manufacturer	Linear Technology
Series	LT3685

36V, 2A, 2.4MHz Step-Down Switching Regulator

Datasheets

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PDF, 282 Kb, Language: en, File uploaded: Sep 19, 2017, Pages: 24
36V, 2A, 2.4MHz Step-Down Switching Regulator

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Prices

Packaging

	LT3685EDD#PBF	LT3685EDD#TRPBF	LT3685EMSE#PBF	LT3685EMSE#TRPBF	LT3685IDD#PBF	LT3685IDD#TRPBF	LT3685IMSE#PBF	LT3685IMSE#TRPBF
N	1	2	3	4	5	6	7	8
Package	3x3 DFN-10 Package Outline Drawing	3x3 DFN-10 Package Outline Drawing	MS-10E Package Outline Drawing	MS-10E Package Outline Drawing	3x3 DFN-10 Package Outline Drawing	3x3 DFN-10 Package Outline Drawing	MS-10E Package Outline Drawing	MS-10E Package Outline Drawing
Package Code	DD	DD	MSE	MSE	DD	DD	MSE	MSE
Package Index	05-08-1699	05-08-1699	05-08-1664	05-08-1664	05-08-1699	05-08-1699	05-08-1664	05-08-1664
Pin Count	10	10	10	10	10	10	10	10

Parametrics

Parameters / Models	LT3685EDD#PBF	LT3685EDD#TRPBF	LT3685EMSE#PBF	LT3685EMSE#TRPBF	LT3685IDD#PBF	LT3685IDD#TRPBF	LT3685IMSE#PBF	LT3685IMSE#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	DC1167A,DC1212A-B	DC1167A,DC1212A-B	DC1167A,DC1212A-B	DC1167A,DC1212A-B	DC1167A,DC1212A-B	DC1167A,DC1212A-B	DC1167A,DC1212A-B	DC1167A,DC1212A-B
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
Export Control	no	no	no	no	no	no	no	no
Features	Resistor Set Frequency, External Synchronization, Power Good	Resistor Set Frequency, External Synchronization, Power Good	Resistor Set Frequency, External Synchronization, Power Good	Resistor Set Frequency, External Synchronization, Power Good	Resistor Set Frequency, External Synchronization, Power Good	Resistor Set Frequency, External Synchronization, Power Good	Resistor Set Frequency, External Synchronization, Power Good	Resistor Set Frequency, External Synchronization, Power Good
Frequency, kHz	2400	2400	2400	2400	2400	2400	2400	2400
Frequency Adjust Range	200kHz - 2.4MHz	200kHz - 2.4MHz	200kHz - 2.4MHz	200kHz - 2.4MHz	200kHz - 2.4MHz	200kHz - 2.4MHz	200kHz - 2.4MHz	200kHz - 2.4MHz
Frequency Sync Range	250kHz - 2MHz	250kHz - 2MHz	250kHz - 2MHz	250kHz - 2MHz	250kHz - 2MHz	250kHz - 2MHz	250kHz - 2MHz	250kHz - 2MHz
Integrated Inductor	no	no	no	no	no	no	no	no
Ishutdown, µA	1.3	1.3	1.3	1.3	1.3	1.3	1.3	1.3
Isupply, mA	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45
Max Phases	1	1	1	1	1	1	1	1
Monolithic	yes	yes	yes	yes	yes	yes	yes	yes
Number of Outputs	1	1	1	1	1	1	1	1
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	2	2	2	2	2	2	2	2
Over Voltage Protection, V	60	60	60	60	60	60	60	60
Polyphase	no	no	no	no	no	no	no	no
Switch Current, A	3.7	3.7	3.7	3.7	3.7	3.7	3.7	3.7
Synchronous	no	no	no	no	no	no	no	no
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Vin Max, V	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
Vout Max, V	20	20	20	20	20	20	20	20
Vout Maximum	20V	20V	20V	20V	20V	20V	20V	20V
Vout Min, V	0.79	0.79	0.79	0.79	0.79	0.79	0.79	0.79
Vref Accuracy Over Temp, %	1.9	1.9	1.9	1.9	1.9	1.9	1.9	1.9

Eco Plan

	LT3685EDD#PBF	LT3685EDD#TRPBF	LT3685EMSE#PBF	LT3685EMSE#TRPBF	LT3685IDD#PBF	LT3685IDD#TRPBF	LT3685IMSE#PBF	LT3685IMSE#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Application Notes

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2-Wire Virtual Remote Sensing for Voltage Regulators - Clairvoyance Marries Remote Sensing &mdash AN126
PDF, 1.4 Mb, File published: Oct 1, 2010
Wires and connectors have resistance. This simple, unavoidable truth dictates that a power source’s remote load voltage will be less than the source’s output voltage. Traditional methods for countering this include increasing the power source voltage and "4-wire" remote voltage sensing. Both have limitations. A new IC based approach achieves "virtual" remote sensing at the load without adding the usual two extra sense wires. Numerous circuit examples show the IC working with various voltage regulators and remote loads. Appendices detail IC internal operation and design guidelines for applying the part in any regulator circuit.
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Application Note 126
October 2010
2-Wire Virtual Remote Sensing for Voltage Regulators
Clairvoyance Marries Remote Sensing
Jim Williams, Jesus Rosales, Kurk Mathews, Tom Hack
Introduction
Wires and connectors have resistance. This simple, unavoidable truth dictates that a power sourceвЂ™s remote load
voltage will be less than the sourceвЂ™s output voltage. Figure 1
shows this, and implies that intended load voltage can
be maintained by raising regulator output. Unfortunately,
line resistance and load variations introduce uncertainties,
limiting achievable performance.
WIRING DROPS POWER
SUPPLY LOAD
AN125 F01 WIRING DROPS Figure 1. Unavoidable Wiring Drops Cause Low Load
Voltage. Line and Load Resistance Variations Introduce
Additional Load Voltage Uncertainty, Mitigating Against
Compensation by Raising Supply Voltage LOAD
VOLTAGE
REGULATOR POWER
SUPPLY LOAD
AN125 F02 Figure 2. Local Regulation Stabilizes
Load Voltage But is Inefп¬Ѓcient VOUT+ VOLTAGE DROP Figure 2 illustrates one compensatory approach. Locally …

Model Line

Series: LT3685 (8)

LT3685EDD#PBF LT3685EDD#TRPBF LT3685EMSE#PBF LT3685EMSE#TRPBF LT3685IDD#PBF LT3685IDD#TRPBF LT3685IMSE#PBF LT3685IMSE#TRPBF

Manufacturer's Classification

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