Datasheet Linear Technology LTC3773

Manufacturer	Linear Technology
Series	LTC3773

Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

Datasheets

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PDF, 485 Kb, Language: en, File uploaded: Sep 23, 2017, Pages: 32
Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

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Packaging

	LTC3773EG#PBF	LTC3773EG#TRPBF	LTC3773EUHF#PBF	LTC3773EUHF#TRPBF
N	1	2	3	4
Package	SSOP-36 Package Outline Drawing	SSOP-36 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing	5x7 QFN-38 Package Outline Drawing
Package Code	G	G	UHF	UHF
Package Index	05-08-1640 (G36)	05-08-1640 (G36)	05-08-1701	05-08-1701
Pin Count	36	36	38	38

Parametrics

Parameters / Models	LTC3773EG#PBF	LTC3773EG#TRPBF	LTC3773EUHF#PBF	LTC3773EUHF#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC908A,DC913A	DC908A,DC913A	DC908A,DC913A	DC908A,DC913A
Design Tools	LTspice Model	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no	no
Features	Tracking, PolyPhase, Power Good, Selectable Switching Frequency, External Synchronization, Burst Mode	Tracking, PolyPhase, Power Good, Selectable Switching Frequency, External Synchronization, Burst Mode	Tracking, PolyPhase, Power Good, Selectable Switching Frequency, External Synchronization, Burst Mode	Tracking, PolyPhase, Power Good, Selectable Switching Frequency, External Synchronization, Burst Mode
Frequency, kHz	700	700	700	700
Frequency Adjust Range	220kHz, 400kHz, 560kHz	220kHz, 400kHz, 560kHz	220kHz, 400kHz, 560kHz	220kHz, 400kHz, 560kHz
Frequency Sync Range	160kHz - 700kHz	160kHz - 700kHz	160kHz - 700kHz	160kHz - 700kHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	20	20	20	20
Isupply, mA	2.8	2.8	2.8	2.8
Max Phases	3	3	3	3
Monolithic	no	no	no	no
Number of Outputs	3	3	3	3
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85	0 to 85
Output Current, A	25	25	25	25
Output Current 2, A	25	25	25	25
Output Current 3, A	25	25	25	25
Polyphase	yes	yes	yes	yes
Sense Resistor	Rsense	Rsense	Rsense	Rsense
Switch Current, A	25	25	25	25
Switch Current 2, A	25	25	25	25
Switch Current 3, 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
Topology 3	Buck	Buck	Buck	Buck
Vin Max, V	36	36	36	36
Vin Min, V	3.3	3.3	3.3	3.3
Vout Max, V	5	5	5	5
Vout Max 2, V	5	5	5	5
Vout Max 3, V	5	5	5	5
Vout Maximum	0.99Vin	0.99Vin	0.99Vin	0.99Vin
Vout Min, V	0.6	0.6	0.6	0.6
Vout Min 2, V	0.6	0.6	0.6	0.6
Vout Min 3, V	0.6	0.6	0.6	0.6
Vref Accuracy Over Temp, %	1.5	1.5	1.5	1.5

Eco Plan

	LTC3773EG#PBF	LTC3773EG#TRPBF	LTC3773EUHF#PBF	LTC3773EUHF#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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Triple Output 3-Phase Controller Saves Space and Improves Performance in High Density Power Converters &mdash DN409
PDF, 94 Kb, File published: Jan 29, 2007
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advertisement Triple Output 3-Phase Controller Saves Space and Improves
Performance in High Density Power Converters
Design Note 409
Mike Shriver
TodayвЂ™s telecommunications, server and network applications require power from a multitude of voltage
rails. Having more than ten rails ranging from 5V to 1V
or less is common. These boards are typically crowded
with heat-producing FPGAs or microprocessors, thus
demanding power converters that are both compact and
highly efп¬Ѓcient. Furthermore, the converters may need
to meet other requirements such as a fast load step
response and rail tracking. 220kHz, 400kHz or 560kHz, or it can be synchronized
to an external clock between 160kHz and 700kHz. The
controller can step down from input voltages as high as
36V and the output voltage can be programmed from
0.6V to 5V.
Figure 1 shows a high density triple output DC/DC converter with each output delivering up to 5A using the
LTC3773 controller. Figure 2 shows the efп¬Ѓciency of each
output versus load current; where up to 93% efп¬Ѓciency is
achieved. Reductions in space are realized by the use of
dual channel FETs and a switching frequency of 400kHz
which permits the use of 7mm Г— 7mm ferrite inductors. The LTCВ® 3773 switching regulator meets and even goes
beyond the above requirements. This device is a 3-phase, …

Model Line

Series: LTC3773 (4)

LTC3773EG#PBF LTC3773EG#TRPBF LTC3773EUHF#PBF LTC3773EUHF#TRPBF

Manufacturer's Classification

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