Datasheet Linear Technology LT3800

Manufacturer	Linear Technology
Series	LT3800

High-Voltage Synchronous Current Mode Step-Down Controller

Datasheets

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PDF, 265 Kb, Language: en, File uploaded: Sep 19, 2017, Pages: 24
High-Voltage Synchronous Current Mode Step-Down Controller

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Packaging

	LT3800EFE#PBF	LT3800EFE#TRPBF	LT3800IFE#PBF	LT3800IFE#TRPBF
N	1	2	3	4
Package	TSSOP-16 Package Outline Drawing	TSSOP-16 Package Outline Drawing	TSSOP-16 Package Outline Drawing	TSSOP-16 Package Outline Drawing
Package Code	FE	FE	FE	FE
Package Index	05-08-1663 (BC)	05-08-1663 (BC)	05-08-1663 (BC)	05-08-1663 (BC)
Pin Count	16	16	16	16

Parametrics

Parameters / Models	LT3800EFE#PBF	LT3800EFE#TRPBF	LT3800IFE#PBF	LT3800IFE#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC720A	DC720A	DC720A	DC720A
Design Tools	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model
Export Control	no	no	no	no
Features	Burst Mode	Burst Mode	Burst Mode	Burst Mode
Frequency, kHz	200	200	200	200
Integrated Inductor	no	no	no	no
Ishutdown, µA	20	20	20	20
Isupply, mA	3	3	3	3
Max Phases	1	1	1	1
Monolithic	no	no	no	no
Number of Outputs	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 85	-40 to 85
Output Current, A	15	15	15	15
Polyphase	no	no	no	no
Sense Resistor	Rsense	Rsense	Rsense	Rsense
Switch Current, A	20	20	20	20
Synchronous	yes	yes	yes	yes
Topology	Buck, Inverting	Buck, Inverting	Buck, Inverting	Buck, Inverting
Vin Max, V	60	60	60	60
Vin Min, V	4	4	4	4
Vout Max, V	36	36	36	36
Vout Maximum	36V	36V	36V	36V
Vout Min, V	1.231	1.231	1.231	1.231
Vref Accuracy Over Temp, %	1	1	1	1
Vswitch Max, V	80	80	80	80

Eco Plan

	LT3800EFE#PBF	LT3800EFE#TRPBF	LT3800IFE#PBF	LT3800IFE#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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High Voltage Current Mode Step-Down Converter with Low Power Standby Capability &mdash DN383
PDF, 126 Kb, File published: Dec 22, 2005
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High Voltage Current Mode Step-Down Converter with Low
Power Standby Capability вЂ“ Design Note 383
Jay Celani
Introduction
Low power standby requirements are typically associated with battery-powered systems. Automotive systems, for example, commonly require power supplies to
maintain output voltage regulation even under no-load
conditionsвЂ”while drawing minimal quiescent current to
preserve battery life. Rising energy costs, however, have
extended the need for low current standby operation to
line-powered systems, such as small plugged-in appliances for home and business. converter requires few external components, maintains
high conversion efп¬Ѓciencies over a wide load range and
supports low power standby operation for compliance
with system power-management requirements.
High Efп¬Ѓciency at Standby
The LT3800 is a 4VIN to 60VIN, 200kHz п¬Ѓxed-frequency
controller that uses synchronous operation and N-channel
MOSFETs to maximize high current efп¬Ѓciency. Current
mode operation with continuous high-side inductor current sensing yields fast transient response and excellent
line regulation. Low current standby requirements are met
using Burst ModeВ® operation. A reverse inductor current
inhibit feature also increases efп¬Ѓciency during light-load
conditions. The LT3800 runs directly from the converter
input supply, so there are no local supplies required to …

Articles

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High Voltage Step-Down Synchronous Controller Offers Single-Supply Operation, Current Mode Control, and 100µA Burst Mode Operation &mdash LT Journal
PDF, 533 Kb, File published: Mar 25, 2005
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DESIGN FEATURES High Voltage Step-Down Synchronous
Controller Offers Single-Supply
Operation, Current Mode Control,
and 100ВµA Burst Mode Operation
by Jay Celani Introduction
As more features and functions are
packed into electronics packages, efп¬Ѓcient step-down DC/DC conversion
circuits that can handle high input
voltages at substantial load currents
are increasingly necessary. This is
especially true for distributed power
systems that have high power point
of load requirements. The LT3800 is
a feature-packed high voltage synchronous step-down controller that
simpliп¬Ѓes meeting these high power
requirements.
The LT3800 is the core of singlesupply DC/DC converter solutions
that require few external components
and maintain high-efп¬Ѓciencies over
wide load ranges. Burst Mode operation and a reverse inductor current
inhibit feature maximize efп¬Ѓciencies
during light-load and no-load conditions, making the LT3800 ideal
for use in applications with supply …

Model Line

Series: LT3800 (4)

LT3800EFE#PBF LT3800EFE#TRPBF LT3800IFE#PBF LT3800IFE#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > High Input Voltage Buck | External Power Switch Buck Controllers