Datasheet Linear Technology LTC3719

Manufacturer	Linear Technology
Series	LTC3719

2-Phase, High Efficiency, Step-Down Controller for AMD Opteron CPUs

Datasheets

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PDF, 457 Kb, Revision: S, File uploaded: Sep 22, 2017

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Packaging

	LTC3719EG#PBF	LTC3719EG#TRPBF
N	1	2
Package	SSOP-24 Package Outline Drawing	SSOP-24 Package Outline Drawing
Package Code	G	G
Package Index	05-08-1640 (G24)	05-08-1640 (G24)
Pin Count	24	24

Parametrics

Parameters / Models	LTC3719EG#PBF	LTC3719EG#TRPBF
Demo Boards	DC449A-A,DC449A-B	DC449A-A,DC449A-B
Design Tools	LTspice Model	LTspice Model
Export Control	no	no
Features	VID, PolyPhase, Active Voltage Positioning, Resistor Set Frequency, Power Good	VID, PolyPhase, Active Voltage Positioning, Resistor Set Frequency, Power Good
Frequency, kHz	300	300
Frequency Adjust Range	150kHz - 300kHz	150kHz - 300kHz
Integrated Inductor	no	no
Ishutdown, µA	20	20
Isupply, mA	1.2	1.2
Max Phases	2	2
Monolithic	no	no
Number of Outputs	1	1
Operating Temperature Range, °C	0 to 85	0 to 85
Output Current, A	40	40
Polyphase	yes	yes
Switch Current, A	40	40
Synchronous	yes	yes
Topology	Buck	Buck
Vin Max, V	36	36
Vin Min, V	4	4
Vout Max, V	1.55	1.55
Vout Min, V	0.8	0.8

Eco Plan

	LTC3719EG#PBF	LTC3719EG#TRPBF
RoHS	Compliant	Compliant

Design Notes

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Active Voltage Positioning Reduces Output Capacitors &mdash Design Solutions 10
PDF, 130 Kb, File published: Nov 1, 1999
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Design Solutions 10
November 1999
Active Voltage Positioning Reduces Output Capacitors
by Robert Sheehan
INTRODUCTION
Power supply performance, especially transient response,
is key to meeting todayвЂ™s demands for low voltage, high
current microprocessor power. In an effort to minimize
the voltage deviation during a load step, a technique that
has recently been coined вЂњactive voltage positioningвЂќ is
generating substantial interest and gaining popularity in
the portable computer market. The benefits include lower
peak-to-peak output voltage deviation for a given load
step, without having to increase the output filter capacitance. Alternatively, the output filter capacitance can be
reduced while maintaining the same peak-to-peak transient response.
BASIC PRINCIPLE
The term вЂњactive voltage positioningвЂќ (AVP) refers to
setting the power supply output voltage at a point that is
dependent on the load current. At minimum load, the
output voltage is set to a slightly higher than nominal level.
At full load, the output voltage is set to a slightly lower than
nominal level. Effectively, the DC load regulation is
degraded, but the load transient voltage deviation will be …
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Cost Effective, Low Profile, High Efficiency 42A Supply Powers AMD Hammer Processors &mdash DN285
PDF, 85 Kb, File published: May 2, 2002
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advertisement Cost Effective, Low Profile, High Efficiency 42A Supply Powers
AMD Hammer Processors вЂ“ Design Note 285
Henry J. Zhang and Wei Chen
Introduction
The new AMD Hammer processors require power supplies that can deliver more than 40A current at very
low output voltages (0.8V to 1.55V). The LTC В®3719
PolyPhaseВ® controller meets these requirements. The
LTC3719 is a current mode, 2-phase VID programmable
controller that drives two synchronous buck stages
180 degrees out of phase of each other. The 2-phase
architecture reduces the number of input and output
capacitors without increasing the switching frequency.
The relatively low switching frequency, along with integrated high current MOSFET drivers keeps efп¬Ѓciency
high and solution size small. the required input and output capacitance, the controller
switching frequency can be synchronized to the external
switching signal from another LTC PolyPhase controller, thus increasing the number of DC/DC converter
phases. To ensure that current is equally shared among
the output phases, the inductor current is sensed with
current sensing resistors. Excellent current sharing
eliminates the potential thermal overstress problem
caused by unbalanced phase current. Therefore, the
MOSFETs and inductors need not be oversized and
the VRM can be operated reliably without heat sink. …

Model Line

Series: LTC3719 (2)

LTC3719EG#PBF LTC3719EG#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Digitally Programmable Regulators