Datasheet Linear Technology LT3740 — Datenblatt

Hersteller	Linear Technology
Serie	LT3740

Großer Betriebsbereich, Valley-Modus, kein synchroner RSENSE-Abwärtsregler

Datenblätter

Vorschau und Herunterladen

PDF, 244 Kb, Sprache: en, Datei hochgeladen: Sep 19, 2017, Seiten: 20
Wide Operating Range, Valley Mode, No RSENSE Synchronous Step-Down Controller

Auszug aus dem Dokument

Verpackung

	LT3740EDHC#PBF	LT3740EDHC#TRPBF
N	1	2
Package	5x3 DFN-16 Paketumrisszeichnung	5x3 DFN-16 Paketumrisszeichnung
Package Code	DHC	DHC
Package Index	05-08-1706	05-08-1706
Pin Count	16	16

Parameter

Parameters / Models	LT3740EDHC#PBF	LT3740EDHC#TRPBF
Architecture	Constant Frequency Valley Current Mode	Constant Frequency Valley Current Mode
Demo Boards	DC947A	DC947A
Design Tools	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model
Export Control	no	no
Features	No Rsense, Power Good, Tracking	No Rsense, Power Good, Tracking
Frequency, kHz	300	300
Integrated Inductor	no	no
Ishutdown, µA	0.6	0.6
Isupply, mA	2.5	2.5
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
Sense Resistor	None	None
Switch Current, A	20	20
Synchronous	yes	yes
Topology	Buck	Buck
Vin Max, V	22	22
Vin Min, V	2.2	2.2
Vout Max, V	5	5
Vout Maximum	5V	5V
Vout Min, V	0.8	0.8
Vref Accuracy Over Temp, %	1	1

Öko-Plan

	LT3740EDHC#PBF	LT3740EDHC#TRPBF
RoHS	Compliant	Compliant

Konstruktionshinweise

Herunterladen
Step-Down Synchronous Controller Operates from Inputs Down to 2.2V &mdash DN443
PDF, 96 Kb, Datei veröffentlicht: May 28, 2008
Auszug aus dem Dokument
Step-Down Synchronous Controller Operates from Inputs Down
to 2.2V
Design Note 443
Wei Gu
Introduction
Many telecommunications and computing applications
need high efп¬Ѓciency step-down DC/DC converters that
can operate from a very low input voltage. The high
output power synchronous controller LT3740 is ideal
for these applications, converting input supplies ranging
from 2.2V to 22V to outputs as low as 0.8V with load
currents from 2A to 20A. Applications include distributed
power systems, point-of-load regulation and conversion
of logic supplies.
A major challenge in designing a step-down converter
with low VIN is that the gate voltage for the N-channel
MOSFETs is not readily available. The LT3740 solves
this problem by integrating a DC/DC step-up converter
for generating its own MOSFET gate drive voltage with
a small inexpensive external inductor. This function
permits the use of inexpensive off-the-shelf 5V gatedrive MOSFETs, offering up to 3% higher efп¬Ѓciency than
sub-logic gate-drive MOSFETs and eliminating the need
for a secondary supply. …

Modellreihe

Serie: LT3740 (2)

LT3740EDHC#PBF LT3740EDHC#TRPBF

Herstellerklassifikation

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

Verwandte Veröffentlichungen

Datenblätter Datasheet Analog Devices LT3740

Kontakte