Datasheet Linear Technology LTC3851A-1

Manufacturer	Linear Technology
Series	LTC3851A-1

Synchronous Step-Down Switching Regulator Controller

Datasheets

Preview and Download

PDF, 442 Kb, Language: en, File uploaded: Sep 23, 2017, Pages: 30
Synchronous Step-Down Switching Regulator Controller

Extract from the document

Prices

Packaging

	LTC3851AEMSE-1#PBF	LTC3851AEMSE-1#TRPBF	LTC3851AEUD-1#PBF	LTC3851AEUD-1#TRPBF	LTC3851AHMSE-1#PBF	LTC3851AHMSE-1#TRPBF	LTC3851AIMSE-1#PBF	LTC3851AIMSE-1#TRPBF	LTC3851AIUD-1#PBF	LTC3851AIUD-1#TRPBF	LTC3851AMPMSE-1#PBF	LTC3851AMPMSE-1#TRPBF
N	1	2	3	4	5	6	7	8	9	10	11	12
Package	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing	3x3 QFN-16 Package Outline Drawing	3x3 QFN-16 Package Outline Drawing	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing	3x3 QFN-16 Package Outline Drawing	3x3 QFN-16 Package Outline Drawing	MS-16E Package Outline Drawing	MS-16E Package Outline Drawing
Package Code	MSE	MSE	UD	UD	MSE	MSE	MSE	MSE	UD	UD	MSE	MSE
Package Index	05-08-1667	05-08-1667	05-08-1691	05-08-1691	05-08-1667	05-08-1667	05-08-1667	05-08-1667	05-08-1691	05-08-1691	05-08-1667	05-08-1667
Pin Count	16	16	16	16	16	16	16	16	16	16	16	16

Parametrics

Parameters / Models	LTC3851AEMSE-1#PBF	LTC3851AEMSE-1#TRPBF	LTC3851AEUD-1#PBF	LTC3851AEUD-1#TRPBF	LTC3851AHMSE-1#PBF	LTC3851AHMSE-1#TRPBF	LTC3851AIMSE-1#PBF	LTC3851AIMSE-1#TRPBF	LTC3851AIUD-1#PBF	LTC3851AIUD-1#TRPBF	LTC3851AMPMSE-1#PBF	LTC3851AMPMSE-1#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B	DC1432A-B
Design Tools	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File	LTspice Model,LTpowerCAD File
Export Control	no	no	no	no	no	no	no	no	no	no	no	no
Features	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode	DCR Current Sense, Power Good, External Synchronization, Tracking, Burst Mode
Frequency, kHz	750	750	750	750	750	750	750	750	750	750	750	750
Frequency Sync Range	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz
Integrated Inductor	no	no	no	no	no	no	no	no	no	no	no	no
Ishutdown, µA	25	25	25	25	25	25	25	25	25	25	25	25
Isupply, mA	1	1	1	1	1	1	1	1	1	1	1	1
Max Phases	1	1	1	1	1	1	1	1	1	1	1	1
Monolithic	no	no	no	no	no	no	no	no	no	no	no	no
Number of Outputs	1	1	1	1	1	1	1	1	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85	0 to 85	-40 to 125	-40 to 125	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-55 to 125	-55 to 125
Output Current, A	25	25	25	25	25	25	25	25	25	25	25	25
Polyphase	no	no	no	no	no	no	no	no	no	no	no	no
Sense Resistor	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR
Switch Current, A	25	25	25	25	25	25	25	25	25	25	25	25
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Vin Max, V	38	38	38	38	38	38	38	38	38	38	38	38
Vin Min, V	4	4	4	4	4	4	4	4	4	4	4	4
Vout Max, V	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5
Vout Maximum	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
Vout Min, V	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
Vref Accuracy Over Temp, %	1	1	1	1	1	1	1	1	1	1	1	1

Eco Plan

	LTC3851AEMSE-1#PBF	LTC3851AEMSE-1#TRPBF	LTC3851AEUD-1#PBF	LTC3851AEUD-1#TRPBF	LTC3851AHMSE-1#PBF	LTC3851AHMSE-1#TRPBF	LTC3851AIMSE-1#PBF	LTC3851AIMSE-1#TRPBF	LTC3851AIUD-1#PBF	LTC3851AIUD-1#TRPBF	LTC3851AMPMSE-1#PBF	LTC3851AMPMSE-1#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Application Notes

Download
Modeling and Loop Compensation Design of Switching Mode Power Supplies &mdash AN149
PDF, 1.4 Mb, File published: Mar 23, 2015
Extract from the document
Application Note 149
January 2015
Modeling and Loop Compensation Design of
Switching Mode Power Supplies
Henry J. Zhang
Introduction Identifying The Problem TodayвЂ™s electronic systems are becoming more and more
complex, with an increasing number of power rails and
supplies. To achieve optimum power solution density,
reliability and cost, often system designers need to design
their own power solutions, instead of just using commercial power supply bricks. Designing and optimizing high
performance switching mode power supplies is becoming
a more frequent and challenging task. A well-designed switching mode power supply (SMPS)
must be quiet, both electrically and acoustically. An undercompensated system may result in unstable operations.
Typical symptoms of an unstable power supply include:
audible noise from the magnetic components or ceramic
capacitors, jittering in the switching waveforms, oscillation
of output voltage, overheating of power FETs and so on. Power supply loop compensation design is usually
viewed as a difficult task, especially for inexperienced
supply designers. Practical compensation design typically
involves numerous iterations on the value adjustment
of the compensation components. This is not only time
consuming, but is also inaccurate in a complicated
system whose supply bandwidth and stability margin …

Model Line

Series: LTC3851A-1 (12)

LTC3851AEMSE-1#PBF LTC3851AEMSE-1#TRPBF LTC3851AEUD-1#PBF LTC3851AEUD-1#TRPBF LTC3851AHMSE-1#PBF LTC3851AHMSE-1#TRPBF LTC3851AIMSE-1#PBF LTC3851AIMSE-1#TRPBF LTC3851AIUD-1#PBF LTC3851AIUD-1#TRPBF LTC3851AMPMSE-1#PBF LTC3851AMPMSE-1#TRPBF

Manufacturer's Classification

Power Management > Switching Regulator > Step-Down (Buck) Regulators > External Power Switch Buck Controllers
Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators