Datasheet Linear Technology LTC1709-7

Manufacturer	Linear Technology
Series	LTC1709-7

2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator

Datasheets

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PDF, 331 Kb, File uploaded: Sep 20, 2017

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Packaging

	LTC1709EG-7#PBF	LTC1709EG-7#TRPBF
N	1	2
Package	SSOP-36 Package Outline Drawing	SSOP-36 Package Outline Drawing
Package Code	G	G
Package Index	05-08-1640 (G36)	05-08-1640 (G36)
Pin Count	36	36

Parametrics

Parameters / Models	LTC1709EG-7#PBF	LTC1709EG-7#TRPBF
Demo Boards	DC292B-A	DC292B-A
Design Tools	LTspice Model	LTspice Model
Export Control	no	no
Features	VID, PolyPhase	VID, PolyPhase
Frequency, kHz	300	300
Integrated Inductor	no	no
Ishutdown, µA	20	20
Isupply, mA	0.47	0.47
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	2	2
Vout Min, V	0.925	0.925

Eco Plan

	LTC1709EG-7#PBF	LTC1709EG-7#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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Dual-Phase High Efficiency Mobile CPU Power Supply Minimizes Size and Thermal Stress &mdash DN247
PDF, 91 Kb, File published: Dec 15, 2001
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advertisement Dual-Phase High Efficiency Mobile CPU Power Supply
Minimizes Size and Thermal Stress
Design Note 247
Wei Chen
Introduction
The increasing demand for computing power in
notebook computers has signiп¬Ѓcantly increased CPU
clock frequencies and supply currents. Forthcoming
mobile CPUs call for core currents as high as 25A to
handle sophisticated computing tasks. Traditional
single-phase solutions have difп¬Ѓculty delivering such
a high current. When the CPU supply voltage (0.7V to
1.8V) is converted directly from a high voltage (21V
max) adapter input, single-phase MOSFET drivers are
not strong enough to efп¬Ѓciently drive high current
MOSFETs without dV/dt shoot-through problems. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are
registered trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. 10О© 1000pF
INTVCC 10О© R3 10k 2.7k The resulting excessive power loss in the MOSFETs
increases thermal stress close to the CPU and reduces
the battery run time. The physical size of a high current (25A) inductor becomes unacceptably large and
more low ESR output capacitors are required to handle
larger load steps. Also, current crowding in PCB traces …

Articles

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PolyPhase Switcher Reduces Parts Count for Smaller, Less Expensive Mobile CPU Supply &mdash LT Journal
PDF, 363 Kb, File published: Sep 1, 2000
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DESIGN IDEAS PolyPhase Switcher Reduces Parts
Count for Smaller, Less Expensive
Mobile CPU Supply
by Wei Chen
Introduction
the LTC1709-7 allows lower cost,
lower profile parts to be used and also
improves transient response.
The LTC1709-7 is a dual, current
mode, PolyPhase controller that drives
two synchronous buck stages 180В°
out of phase. This small, SSOP-36
packaged controller integrates four
high current MOSFET drivers, a differential amp for true output remote The LTC1709-7 takes advantage of
PolyPhaseв„ў switching techniques to
reduce the number of input capacitors
and the inductor size and to increase
battery life. As CPU clock frequencies
increase, the demand for core supply
current also increases. TodayвЂ™s 22A
CPU core current requirements push
single-stage switchers to the max.
The PolyPhase switching designed into sensing, automatic current sharing …

Model Line

Series: LTC1709-7 (2)

LTC1709EG-7#PBF LTC1709EG-7#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Digitally Programmable Regulators