Datasheet Linear Technology LTC3865-1

Manufacturer	Linear Technology
Series	LTC3865-1

Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

Datasheets

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PDF, 415 Kb, Language: en, File uploaded: Sep 24, 2017, Pages: 38
Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

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Packaging

	LTC3865EUH-1#PBF	LTC3865EUH-1#TRPBF	LTC3865IUH-1#PBF	LTC3865IUH-1#TRPBF
N	1	2	3	4
Package	5x5 QFN-32 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing	5x5 QFN-32 Package Outline Drawing
Package Code	UH	UH	UH	UH
Package Index	05-08-1693	05-08-1693	05-08-1693	05-08-1693
Pin Count	32	32	32	32

Parametrics

Parameters / Models	LTC3865EUH-1#PBF	LTC3865EUH-1#TRPBF	LTC3865IUH-1#PBF	LTC3865IUH-1#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC1479A,DC1480A	DC1479A,DC1480A	DC1479A,DC1480A	DC1479A,DC1480A
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File
Export Control	no	no	no	no
Features	Pin Selectable Output Voltage, PolyPhase, DCR Current Sense, External Synchronization, Resistor Set Frequency, Tracking, Power Good	Pin Selectable Output Voltage, PolyPhase, DCR Current Sense, External Synchronization, Resistor Set Frequency, Tracking, Power Good	Pin Selectable Output Voltage, PolyPhase, DCR Current Sense, External Synchronization, Resistor Set Frequency, Tracking, Power Good	Pin Selectable Output Voltage, PolyPhase, DCR Current Sense, External Synchronization, Resistor Set Frequency, Tracking, Power Good
Frequency, kHz	770	770	770	770
Frequency Adjust Range	250kHz - 770kHz	250kHz - 770kHz	250kHz - 770kHz	250kHz - 770kHz
Frequency Sync Range	250kHz - 770kHz	250kHz - 770kHz	250kHz - 770kHz	250kHz - 770kHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	30	30	30	30
Isupply, mA	3	3	3	3
Max Phases	2	2	2	2
Monolithic	no	no	no	no
Number of Outputs	2	2	2	2
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 85	-40 to 85
Output Current, A	25	25	25	25
Output Current 2, A	25	25	25	25
Polyphase	yes	yes	yes	yes
Sense Resistor	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR
Switch Current, A	25	25	25	25
Switch Current 2, A	25	25	25	25
Synchronous	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck
Vin Max, V	38	38	38	38
Vin Min, V	4.5	4.5	4.5	4.5
Vout Max, V	5	5	5	5
Vout Maximum	5V	5V	5V	5V
Vout Min, V	0.6	0.6	0.6	0.6
Vout Min 2, V	0.6	0.6	0.6	0.6
Vref Accuracy Over Temp, %	1	1	1	1

Eco Plan

	LTC3865EUH-1#PBF	LTC3865EUH-1#TRPBF	LTC3865IUH-1#PBF	LTC3865IUH-1#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Other Options

LTC3865 LTC3865

Articles

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Dual Output Step-Down Regulator Features Pin Selectable Outputs, DCR Sensing, Reverse Current Protection and a 5mm × 5mm QFN &mdash LT Journal
PDF, 426 Kb, File published: Apr 1, 2010
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design features Dual Output Step-Down Regulator Features Pin Selectable
Outputs, DCR Sensing, Reverse Current Protection and a
5mm Г— 5mm QFN
Stephanie Dai The LTC3865 is a high performance step-down controller with two constant frequency,
current mode, synchronous buck controllers and on-chip drivers. It offers high output
current capability over a wide input range. An important feature offered by the LTC3865 is its
highly accurate programmable output voltage. Internal precision feedback resistors make it
possible to select from nine different output voltages via two VID pins. The internal resistors
reduce the number of external components and assure 1% accuracy for low voltage rails.
The LTC3865 is suitable for applications
with input voltages up to 38V and output
voltages up to 5V. It can be synchronized
to a frequency of up to 750kHz and comes
in a compact 5mm Г— 5mm QFN package. The part is also capable of inductor DCR sensing, allowing for increased
efficiencies at higher load currents. These
features are ideal for wide input voltage
range, high current applications where
design solution footprint size is restricted. them floating can result in nine different output voltages from 0.6V to 5V (see
Table 1). Pin programming eliminates
at least four external feedback resistors, making the overall design solution
space conservative and cost effective. If
an application requires an output voltage not supported by pin programming,
one still has the option to use external …

Model Line

Series: LTC3865-1 (4)

LTC3865EUH-1#PBF LTC3865EUH-1#TRPBF LTC3865IUH-1#PBF LTC3865IUH-1#TRPBF

Manufacturer's Classification

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