LTC3855EFE#PBF datasheet, PDF - EEWORLD Datasheet

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LTC3855EFE#PBF: DescriptionOutputable current: - Switching operating frequency: 250kHz ~ 770kHz Output type: Transistor Driver Number of output voltage channels: 2 Function type: Step-Down Output configuration: Positive; CategoryPower/power management The power supply circuit; File Size2MB，44 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC3855EFE#PBF Overview

Outputable current: - Switching operating frequency: 250kHz ~ 770kHz Output type: Transistor Driver Number of output voltage channels: 2 Function type: Step-Down Output configuration: Positive

LTC3855EFE#PBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	TSSOP
package instruction	HTSSOP, TSSOP38,.25,20
Contacts	38
Manufacturer packaging code	FE
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PHASE-SHIFT CONTROL
Maximum input voltage	38 V
Minimum input voltage	4.5 V
Nominal input voltage	15 V
JESD-30 code	R-PDSO-G38
JESD-609 code	e3
length	9.7 mm
Humidity sensitivity level	1
Number of functions	2
Number of terminals	38
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	HTSSOP
Encapsulate equivalent code	TSSOP38,.25,20
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.2 mm
surface mount	YES
Switch configuration	PHASE-SHIFT
Maximum switching frequency	770 kHz
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	0.5 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	4.4 mm

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LTC3855

Dual, Multiphase

Synchronous DC/DC Controller

with Differential Remote Sense

FeaTures

DescripTion

The LTC

3855 is a dual PolyPhase

current mode synchro-

nous step-down switching regulator controller that drives

all N-channel power MOSFET stages. It includes a high

speed differential remote sense amplifier. The maximum

current sense voltage is programmable for either 30mV,

50mV or 75mV, allowing the use of either the inductor DCR

or a discrete sense resistor as the sensing element.

The LTC3855 features a precision 0.6V reference and can

produce output voltages up to 12.5V. A wide 4.5V to 38V

input supply range encompasses most intermediate bus

voltages and battery chemistries. Power loss and supply

noise are minimized by operating the two controller output

stages out of phase. Burst Mode

operation, continuous

or pulse-skipping modes are supported.

The LTC3855 can be configured for up to 12-phase op-

eration, has DCR temperature compensation, two power

good signals and two current limit set pins. The LTC3855

is available in low profile 40-pin 6mm

6mm QFN and

38-lead exposed pad FE packages.

LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and PolyPhase are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6100678,

6144194, 6177787, 6304066, 6580258.

Dual, 180° Phased Controllers Reduce Required

Input Capacitance and Power Supply Induced Noise

High Efficiency: Up to 95%

SENSE

or DCR Current Sensing

Programmable DCR Temperature Compensation

±0.75% 0.6V Output Voltage Accuracy

Phase-Lockable Fixed Frequency 250kHz to 770kHz

True Remote Sensing Differential Amplifier

Dual N-Channel MOSFET Synchronous Drive

Wide V

Range: 4.5V to 38V

OUT

Range: 0.6V to 12.5V without Differential Amplifier

OUT

Range: 0.6V to 3.3V with Differential Amplifier

Clock Input and Output for Up to 12-Phase Operation

Adjustable Soft-Start or V

OUT

Tracking

Foldback Output Current Limiting

Output Overvoltage Protection

40-Pin (6mm

6mm) QFN and 38-Lead FE Packages

applicaTions

Computer Systems

Telecom Systems

Industrial and Medical Instruments

DC Power Distribution Systems

Typical applicaTion

High Efficiency Dual 1.8V/1.2V Step-Down Converter

4.7µF

TG1

0.1µF

BOOST1

SW1

BG1

PGND1

SENSE1

LTC3855

INTV

TG2

BOOST2

SW2

BG2

PGND2

FREQ

SENSE2

–

DIFFOUT

FB2

TH2

0.1µF

100k

1µF

22µF

4.5V TO

20V

Load Step

(Forced Continuous Mode)

LOAD

5A/DIV

300mA TO 5A

5A/DIV

0.56µH

0.1µF

0.4µH

OUT1

1.8V

15A

SENSE1

–

40.2k

FB1

TH1

20k

OUT2

1.2V

15A

OUT

100mV/DIV

AC-COUPLED

470pF

330µF

×2

20k

15k

0.1µF

TK/SS1 DIFFP SGND DIFFN TK/SS2

470pF

7.5k

20k

3855 TA01

330µF

×2

= 12V

OUT

= 1.8V

50µs/DIV

3855

TA01a

3855f

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Description	Outputable current: - Switching operating frequency: 250kHz ~ 770kHz Output type: Transistor Driver Number of output voltage channels: 2 Function type: Step-Down Output configuration: Positive	IC REG CTRLR BUCK 38TSSOP	IC REG CTRLR BUCK 40QFN	IC REG CTRLR BUCK 40QFN	IC REG CTRLR BUCK 38TSSOP	IC REG CTRLR BUCK 40QFN	Outputable current: - Switching operating frequency: 250kHz ~ 770kHz Output type: Transistor Driver Number of output voltage channels: 2 Function type: Step-Down Output configuration: Positive dual-channel, multi-phase, synchronous DC/DC controller	Outputable current: - Switching operating frequency: 250kHz ~ 770kHz Output type: Transistor Driver Number of output voltage channels: 2 Function type: Step-Down Output configuration: Positive
Brand Name	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	conform to	conform to	conform to	conform to	conform to	conform to	conform to	conform to
Maker	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	TSSOP	TSSOP	QFN	QFN	TSSOP	QFN	TSSOP	QFN
package instruction	HTSSOP, TSSOP38,.25,20	HTSSOP, TSSOP38,.25,20	HVSON, LCC40,.24SQ,20	HVSON, LCC40,.24SQ,20	HTSSOP, TSSOP38,.25,20	HVSON, LCC40,.24SQ,20	HTSSOP, TSSOP38,.25,20	HVSON, LCC40,.24SQ,20
Contacts	38	38	40	40	38	40	38	40
Manufacturer packaging code	FE	FE	UJ	UJ	FE	UJ	FE	UJ
Reach Compliance Code	compliant	compliant	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	PHASE-SHIFT CONTROL	PHASE-SHIFT CONTROL	PHASE-SHIFT CONTROL	PHASE-SHIFT CONTROL	PHASE-SHIFT CONTROL	PHASE-SHIFT CONTROL	PHASE-SHIFT CONTROL	PHASE-SHIFT CONTROL
Maximum input voltage	38 V	38 V	38 V	38 V	38 V	38 V	38 V	38 V
Minimum input voltage	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V
Nominal input voltage	15 V	15 V	15 V	15 V	15 V	15 V	15 V	15 V
JESD-30 code	R-PDSO-G38	R-PDSO-G38	S-PDSO-N40	S-PDSO-N40	R-PDSO-G38	S-PDSO-N40	R-PDSO-G38	S-PDSO-N40
JESD-609 code	e3	e3	e3	e3	e3	e3	e3	e3
length	9.7 mm	9.7 mm	6 mm	6 mm	9.7 mm	6 mm	9.7 mm	6 mm
Humidity sensitivity level	1	1	1	1	1	1	1	1
Number of functions	2	2	2	2	2	2	2	2
Number of terminals	38	38	40	40	38	40	38	40
Maximum operating temperature	85 °C	85 °C	125 °C	125 °C	125 °C	85 °C	125 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HTSSOP	HTSSOP	HVSON	HVSON	HTSSOP	HVSON	HTSSOP	HVSON
Encapsulate equivalent code	TSSOP38,.25,20	TSSOP38,.25,20	LCC40,.24SQ,20	LCC40,.24SQ,20	TSSOP38,.25,20	LCC40,.24SQ,20	TSSOP38,.25,20	LCC40,.24SQ,20
Package shape	RECTANGULAR	RECTANGULAR	SQUARE	SQUARE	RECTANGULAR	SQUARE	RECTANGULAR	SQUARE
Package form	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	260	260	260	260	260	260	260	260
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.2 mm	1.2 mm	0.8 mm	0.8 mm	1.2 mm	0.8 mm	1.2 mm	0.8 mm
surface mount	YES	YES	YES	YES	YES	YES	YES	YES
Switch configuration	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT	PHASE-SHIFT
Maximum switching frequency	770 kHz	770 kHz	770 kHz	770 kHz	770 kHz	770 kHz	770 kHz	770 kHz
technology	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	INDUSTRIAL	INDUSTRIAL	AUTOMOTIVE	AUTOMOTIVE	AUTOMOTIVE	INDUSTRIAL	AUTOMOTIVE	INDUSTRIAL
Terminal surface	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	NO LEAD	NO LEAD	GULL WING	NO LEAD	GULL WING	NO LEAD
Terminal pitch	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	30	30	30	30	30	30	30	30
width	4.4 mm	4.4 mm	6 mm	6 mm	4.4 mm	6 mm	4.4 mm	6 mm

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