Datasheet Linear Technology LTC3850

Manufacturer	Linear Technology
Series	LTC3850

Dual, 2-Phase Synchronous Step-Down Switching Controller

Datasheets

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PDF, 604 Kb, File uploaded: Jul 31, 2016

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Packaging

	LTC3850EGN#PBF	LTC3850EGN#TRPBF	LTC3850EGN-1#PBF	LTC3850EGN-1#TRPBF	LTC3850EUF#PBF	LTC3850EUF#TRPBF	LTC3850EUFD#PBF	LTC3850EUFD#TRPBF	LTC3850IGN#PBF	LTC3850IGN#TRPBF	LTC3850IGN-1#PBF	LTC3850IGN-1#TRPBF	LTC3850IUF#PBF	LTC3850IUF#TRPBF	LTC3850IUFD#PBF	LTC3850IUFD#TRPBF
N	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
Package	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	SSOP-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing	4x5 QFN-28 Package Outline Drawing
Package Code	GN	GN	GN	GN	UFD	UFD	UFD	UFD	GN	GN	GN	GN	UFD	UFD	UFD	UFD
Package Index	05-08-1641 (GN28)	05-08-1641 (GN28)	05-08-1641 (GN28)	05-08-1641 (GN28)	05-08-1712	05-08-1712	05-08-1712	05-08-1712	05-08-1641 (GN28)	05-08-1641 (GN28)	05-08-1641 (GN28)	05-08-1641 (GN28)	05-08-1712	05-08-1712	05-08-1712	05-08-1712
Pin Count	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28	28

Parametrics

Parameters / Models	LTC3850EGN#PBF	LTC3850EGN#TRPBF	LTC3850EGN-1#PBF	LTC3850EGN-1#TRPBF	LTC3850EUF#PBF	LTC3850EUF#TRPBF	LTC3850EUFD#PBF	LTC3850EUFD#TRPBF	LTC3850IGN#PBF	LTC3850IGN#TRPBF	LTC3850IGN-1#PBF	LTC3850IGN-1#TRPBF	LTC3850IUF#PBF	LTC3850IUF#TRPBF	LTC3850IUFD#PBF	LTC3850IUFD#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	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A	DC1126A,DC1185B-A,DC1185B-B,DC1231A-A,DC1231A-B,DC1185A-A
Design Tools	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File	LTspice File,LTpowerCAD File
Export Control	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no
Features	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good	PolyPhase, DCR Current Sense, Selectable Switching Frequency, External Synchronization, PLL, Tracking, Power Good
Frequency, kHz	500	500	500	500	500	500	500	500	500	500	500	500	500	500	500	500
Frequency Adjust Range	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz
Frequency Sync Range	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz	250kHz - 780kHz
Integrated Inductor	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no
Ishutdown, µA	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30
Isupply, mA	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85	0.85
Max Phases	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2
Monolithic	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no
Number of Outputs	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2
Operating Temperature Range, °C	0 to 85	0 to 85	0 to 85	0 to 85	0 to 85	0 to 85	0 to 85	0 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Output Current, A	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25
Output Current 2, A	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25
Polyphase	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes	yes
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	Rsense, DCR	Rsense, DCR	Rsense, DCR	Rsense, DCR
Switch Current, A	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25
Switch Current 2, A	25	25	25	25	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	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Vin Max, V	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24
Vin Min, V	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Vout Max, V	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Vout Maximum	6V	6V	6V	6V	6V	6V	6V	6V	6V	6V	6V	6V	6V	6V	6V	6V
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	0.8	0.8	0.8	0.8
Vout Min 2, 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	0.8	0.8	0.8	0.8
Vref Accuracy Over Temp, %	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1

Eco Plan

	LTC3850EGN#PBF	LTC3850EGN#TRPBF	LTC3850EGN-1#PBF	LTC3850EGN-1#TRPBF	LTC3850EUF#PBF	LTC3850EUF#TRPBF	LTC3850EUFD#PBF	LTC3850EUFD#TRPBF	LTC3850IGN#PBF	LTC3850IGN#TRPBF	LTC3850IGN-1#PBF	LTC3850IGN-1#TRPBF	LTC3850IUF#PBF	LTC3850IUF#TRPBF	LTC3850IUFD#PBF	LTC3850IUFD#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Articles

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2-Phase Synchronous Buck Controller Delivers Maximum Features in Minimum Footprint &mdash LT Journal
PDF, 1.2 Mb, File published: Oct 16, 2007
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LвЂ‰DESIGN FEATURES 2-Phase Synchronous Buck Controller
Delivers Maximum Features in
by Eric Gu and Theo Phillips
Minimum Footprint
Introduction
The LTC3850 is a feature-rich dual
channel synchronous step-down
switching regulator available in a 4mm
Г— 4mm QFN package. It is designed to
meet todayвЂ™s high performance power
application needs. With constant
frequency peak current mode control for clean operation over a broad
range of duty cycles, the LTC3850 is a response to customer requests for
a cost-effective solution that balances
ease of use, efficiency, precision and
performance. Familiar Features,
and Some New Ones CCM BURST
10mV/DIV
DCM
1Вµs/DIV Figure 1. Three modes of operation.
Continuous mode features predictable,
constant frequency operation. Burst ModeВ®
operation has the best light-load efficiency, …

Model Line

Series: LTC3850 (16)

LTC3850EGN#PBF LTC3850EGN#TRPBF LTC3850EGN-1#PBF LTC3850EGN-1#TRPBF LTC3850EUF#PBF LTC3850EUF#TRPBF LTC3850EUFD#PBF LTC3850EUFD#TRPBF LTC3850IGN#PBF LTC3850IGN#TRPBF LTC3850IGN-1#PBF LTC3850IGN-1#TRPBF LTC3850IUF#PBF LTC3850IUF#TRPBF LTC3850IUFD#PBF LTC3850IUFD#TRPBF

Manufacturer's Classification

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