Datasheet Linear Technology LTC3720

Manufacturer	Linear Technology
Series	LTC3720

Single Phase VRM8.5 Current Mode Step-Down Controller

Datasheets

PDF, 303 Kb, File uploaded: Sep 22, 2017

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Prices

Packaging

	LTC3720EGN#PBF	LTC3720EGN#TRPBF
N	1	2
Package	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing
Package Code	GN	GN
Package Index	05-08-1641 (GN28)	05-08-1641 (GN28)
Pin Count	28	28

Parametrics

Parameters / Models	LTC3720EGN#PBF	LTC3720EGN#TRPBF
Demo Boards	DC483A	DC483A
Design Tools	LTspice Model	LTspice Model
Export Control	no	no
Features	VID, Active Voltage Positioning, Resistor Set Frequency, Power Good	VID, Active Voltage Positioning, Resistor Set Frequency, Power Good
Frequency, kHz	200	200
Frequency Adjust Range	150kHz - 300kHz	150kHz - 300kHz
Integrated Inductor	no	no
Ishutdown, µA	15	15
Isupply, mA	0.9	0.9
Max Phases	1	1
Monolithic	no	no
Number of Outputs	1	1
Operating Temperature Range, °C	0 to 85	0 to 85
Output Current, A	20	20
Polyphase	no	no
Switch Current, A	20	20
Synchronous	yes	yes
Topology	Buck	Buck
Vin Max, V	36	36
Vin Min, V	4	4
Vout Max, V	1.825	1.825
Vout Min, V	1.05	1.05

Eco Plan

	LTC3720EGN#PBF	LTC3720EGN#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 …

Articles

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VRM8.5 Design with the LTC3720 Achieves Small Size and Fast Transient Response &mdash LT Journal
PDF, 174 Kb, File published: Aug 9, 2004
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DESIGN IDEAS VRM8.5 Design with the LTC3720
Achieves Small Size and Fast Transient
Response
by David Chen
Several different brands of CPUs
fall into IntelВ® VRM8.5 category. Depending upon clock frequency and
computation power, these CPUs consume different levels of supply current
ranging from several amperes to 30A.
The newly released LTC3720 single-3.3V POWER GOOD
BAT54C 3 CSS
0.1ВµF 1
0.01ВµF INT VCC 2
4 CC 220pF R
VP2
105k
RVP1 21.0k 5
6
20k 220pF 7 David Chen Lower the Output Voltage Ripple of
Positive-to-Negative DC/DC Converters
with Optimum Capacitor Hook-Up
. 22
Keith Szolusha Use a Single Input to Acquire Two
Similar Signals Simultaneously and …

Model Line

Series: LTC3720 (2)

LTC3720EGN#PBF LTC3720EGN#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Digitally Programmable Regulators

EMS supplier

Slices

Microcontrollers