Datasheet Linear Technology LTC1877

Manufacturer	Linear Technology
Series	LTC1877

High Efficiency Monolithic Synchronous Step-Down Regulator

Datasheets

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PDF, 246 Kb, Language: en, File uploaded: Sep 20, 2017, Pages: 18
High Efficiency Monolithic Synchronous Step-Down Regulator

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Packaging

	LTC1877EMS8#PBF	LTC1877EMS8#TRPBF	LTC1877IMS8#PBF	LTC1877IMS8#TRPBF
N	1	2	3	4
Package	MS-8 Package Outline Drawing	MS-8 Package Outline Drawing	MS-8 Package Outline Drawing	MS-8 Package Outline Drawing
Package Code	MS8	MS8	MS8	MS8
Package Index	05-08-1660	05-08-1660	05-08-1660	05-08-1660
Pin Count	8	8	8	8

Parametrics

Parameters / Models	LTC1877EMS8#PBF	LTC1877EMS8#TRPBF	LTC1877IMS8#PBF	LTC1877IMS8#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC290A-A	DC290A-A	DC290A-A	DC290A-A
Design Tools	LTspice Model	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no	no
Features	Burst Mode, External Synchronization, 100% Duty Cycle	Burst Mode, External Synchronization, 100% Duty Cycle	Burst Mode, External Synchronization, 100% Duty Cycle	Burst Mode, External Synchronization, 100% Duty Cycle
Frequency, kHz	550	550	550	550
Frequency Sync Range	400kHz - 700kHz	400kHz - 700kHz	400kHz - 700kHz	400kHz - 700kHz
Integrated Inductor	no	no	no	no
Ishutdown, µA	0.01	0.01	0.01	0.01
Isupply, mA	0.01	0.01	0.01	0.01
Max Phases	1	1	1	1
Monolithic	yes	yes	yes	yes
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	0.6	0.6	0.6	0.6
Polyphase	no	no	no	no
Switch Current, A	1	1	1	1
Synchronous	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck
Vin Max, V	10	10	10	10
Vin Min, V	2.65	2.65	2.65	2.65
Vout Max, V	10	10	10	10
Vout Maximum	Vin	Vin	Vin	Vin
Vout Min, V	0.8	0.8	0.8	0.8
Vref Accuracy Over Temp, %	2	2	2	2

Eco Plan

	LTC1877EMS8#PBF	LTC1877EMS8#TRPBF	LTC1877IMS8#PBF	LTC1877IMS8#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

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10ВµA Quiescent Current Step-Down Regulators Extend Standby Time in Handheld Products &mdash DN235
PDF, 83 Kb, File published: Jul 6, 2001
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advertisement 10ВµA Quiescent Current Step-Down Regulators Extend
Standby Time in Handheld Products вЂ“ Design Note 235
Greg Dittmer
Importance of Low Quiescent Current
Many handheld products on the market today are used
only occasionally but must be kept alive and ready all
the time. When not being used, the circuitry is powered
down to save battery energy, with a minimum amount
of circuitry remaining on. Although the supply current
is signiп¬Ѓcantly reduced in this low power standby mode,
the battery energy will still be slowly depleted to power
the keep-alive circuitry and the regulator. If the device
spends most of its time in this standby mode, the quiescent current of the regulator can have a signiп¬Ѓcant
effect on the life of the battery (see Figure 1).
To maximize the life of the battery in these types of
products, Linear Technology has extended its family
of 10ОјA step-down regulators to provide three new
products. The LTC В®1771 is a constant off-time controller that drives an external P-channel MOSFET for
output loads up to 5A. The LTC1877 and LTC1878 are
monolithic regulators that provide constant frequency
(550kHz) plus synchronous operation for loads up
to 600mA. Due to their micropower architecture, the
LTC1771, LTC1877 and LTC1878 require only 10ОјA of …

Articles

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Monolithic Synchronous Step-Down Regulators Pack >500mA Output Current in an MS8 Package &mdash LT Journal
PDF, 311 Kb, File published: May 1, 2000
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LINEAR TECHNOLOGY
MAY 2000 IN THIS ISSUEвЂ¦
COVER ARTICLE
Monolithic Synchronous Step-Down
Regulators Pack 500mA Output
Current in an MS8 Package
.1
Jaime Tseng and Gary Shockey Issue Highlights . 2
LTCВ® in the News .2
DESIGN FEATURES
New Rail-to-Rail Output Op Amps
Bring Precision Performance to
Low Voltage Systems .6
Alexander Strong and Gary Maulding DC Accurate, Rail-to-Rail Active RC
Lowpass Filter Replaces Discrete
DesignsвЂ”One Resistor Value Sets
the Cutoff Frequency
. 11
Doug La Porte SOT-23 Switching Regulator with
Integrated 1 Amp Switch Delivers
High Current Outputs . 17
Albert Wu Dual Operational Amplifier
Combines 16-Bit Precision with …

Model Line

Series: LTC1877 (4)

LTC1877EMS8#PBF LTC1877EMS8#TRPBF LTC1877IMS8#PBF LTC1877IMS8#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > Micropower Buck Regulators | Internal Power Switch Buck

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