Datasheet Linear Technology LTC3853

Manufacturer	Linear Technology
Series	LTC3853

Triple Output, Multiphase Synchronous Step-Down Controller

Datasheets

Preview and Download

PDF, 763 Kb, Language: en, File uploaded: Sep 23, 2017, Pages: 36
Triple Output, Multiphase Synchronous Step-Down Controller

Extract from the document

Prices

Packaging

	LTC3853EUJ#PBF	LTC3853EUJ#TRPBF	LTC3853HUJ#PBF	LTC3853HUJ#TRPBF	LTC3853IUJ#PBF	LTC3853IUJ#TRPBF	LTC3853MPUJ#PBF	LTC3853MPUJ#TRPBF
N	1	2	3	4	5	6	7	8
Package	6x6 QFN-40 Package Outline Drawing	6x6 QFN-40 Package Outline Drawing	6x6 QFN-40 Package Outline Drawing	6x6 QFN-40 Package Outline Drawing	6x6 QFN-40 Package Outline Drawing	6x6 QFN-40 Package Outline Drawing	6x6 QFN-40 Package Outline Drawing	6x6 QFN-40 Package Outline Drawing
Package Code	UJ	UJ	UJ	UJ	UJ	UJ	UJ	UJ
Package Index	05-08-1728	05-08-1728	05-08-1728	05-08-1728	05-08-1728	05-08-1728	05-08-1728	05-08-1728
Pin Count	40	40	40	40	40	40	40	40

Parametrics

Parameters / Models	LTC3853EUJ#PBF	LTC3853EUJ#TRPBF	LTC3853HUJ#PBF	LTC3853HUJ#TRPBF	LTC3853IUJ#PBF	LTC3853IUJ#TRPBF	LTC3853MPUJ#PBF	LTC3853MPUJ#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
Demo Boards	DC1254A,DC1349A	DC1254A,DC1349A	DC1254A,DC1349A	DC1254A,DC1349A	DC1254A,DC1349A	DC1254A,DC1349A	DC1254A,DC1349A	DC1254A,DC1349A
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File
Export Control	no	no	no	no	no	no	no	no
Features	PolyPhase, DCR Current Sense, External Synchronization, PLL, Power Good, Tracking	PolyPhase, DCR Current Sense, External Synchronization, PLL, Power Good, Tracking	PolyPhase, DCR Current Sense, External Synchronization, PLL, Power Good, Tracking	PolyPhase, DCR Current Sense, External Synchronization, PLL, Power Good, Tracking	PolyPhase, DCR Current Sense, External Synchronization, PLL, Power Good, Tracking	PolyPhase, DCR Current Sense, External Synchronization, PLL, Power Good, Tracking	PolyPhase, DCR Current Sense, External Synchronization, PLL, Power Good, Tracking	PolyPhase, DCR Current Sense, External Synchronization, PLL, Power Good, Tracking
Frequency, kHz	500	500	500	500	500	500	500	500
Frequency Adjust Range	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz	250kHz - 750kHz
Frequency Sync Range	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
Ishutdown, µA	42	42	42	42	42	42	42	42
Isupply, mA	4.1	4.1	4.1	4.1	4.1	4.1	4.1	4.1
Max Phases	3	3	3	3	3	3	3	3
Monolithic	no	no	no	no	no	no	no	no
Number of Outputs	3	3	3	3	3	3	3	3
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 125	-40 to 125	-40 to 85	-40 to 85	-55 to 125	-55 to 125
Output Current, A	25	25	25	25	25	25	25	25
Output Current 2, A	25	25	25	25	25	25	25	25
Output Current 3, A	25	25	25	25	25	25	25	25
Polyphase	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
Switch Current, A	25	25	25	25	25	25	25	25
Switch Current 2, A	25	25	25	25	25	25	25	25
Switch Current 3, A	25	25	25	25	25	25	25	25
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 1	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 2	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Topology 3	Buck	Buck	Buck	Buck	Buck	Buck	Buck	Buck
Vin Max, V	24	24	24	24	24	24	24	24
Vin Min, V	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5
Vout Max, V	13.5	13.5	13.5	13.5	13.5	13.5	13.5	13.5
Vout Max 2, V	13.5	13.5	13.5	13.5	13.5	13.5	13.5	13.5
Vout Max 3, V	13.5	13.5	13.5	13.5	13.5	13.5	13.5	13.5
Vout Maximum	13.5V	13.5V	13.5V	13.5V	13.5V	13.5V	13.5V	13.5V
Vout Min, V	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
Vout Min 3, V	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

Eco Plan

	LTC3853EUJ#PBF	LTC3853EUJ#TRPBF	LTC3853HUJ#PBF	LTC3853HUJ#TRPBF	LTC3853IUJ#PBF	LTC3853IUJ#TRPBF	LTC3853MPUJ#PBF	LTC3853MPUJ#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Articles

Download
6mm × 6mm DC/DC Controller Regulates Three Outputs; or Combine Two Outputs for Twice the Current &mdash LT Journal
PDF, 214 Kb, File published: Jun 1, 2008
Extract from the document
LвЂ‰DESIGN IDEAS 6mm Г— 6mm DC/DC Controller
Regulates Three Outputs; or Combine
Two Outputs for Twice the Current
by Theo Phillips Introduction
The LTC3853 is a versatile 3-phase
synchronous buck controller with
on-chip drivers in a 6mm Г— 6mm
QFN package. While each channel
can independently deliver currents
in excess of 15A, two of the channels
can be combined for twice the current,
with their relative operating phase
automatically optimized to reduce
output ripple. Channels 1 and 2 can
be programmed for outputs from 0.8V
to 5V, while channel 3 can support
outputs from 0.8V to 13.2V. and minimizing the input capacitance
requirement. Dual Output Converter
with 2 + 1 Operation Figure 1 shows a 2-output converter
working from a 14V to 24V input.
Channels 1 and 2 feed the same 1.8V
output, while channel 3 controls a
second 12V output. This 2 + 1 mode …

Model Line

Series: LTC3853 (8)

LTC3853EUJ#PBF LTC3853EUJ#TRPBF LTC3853HUJ#PBF LTC3853HUJ#TRPBF LTC3853IUJ#PBF LTC3853IUJ#TRPBF LTC3853MPUJ#PBF LTC3853MPUJ#TRPBF

Manufacturer's Classification

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