LTC3868IUFD-1#TRPBF datasheet, PDF

Datasheet> All Categories > Power/power management> The power supply circuit> LTC3868IUFD-1#TRPBF

LTC3868IUFD-1#TRPBF: DescriptionIC REG CTRLR BUCK 28QFN; CategoryPower/power management The power supply circuit; File Size471KB，38 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC3868IUFD-1#TRPBF Overview

IC REG CTRLR BUCK 28QFN

LTC3868IUFD-1#TRPBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	QFN
package instruction	HVQCCN, LCC28,.16X.2,20
Contacts	28
Manufacturer packaging code	UFD
Reach Compliance Code	compliant
ECCN code	EAR99
Other features	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	24 V
Minimum input voltage	4 V
Nominal input voltage	12 V
JESD-30 code	R-PQCC-N28
JESD-609 code	e3
length	5 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	28
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Nominal output voltage	5.1 V
Package body material	PLASTIC/EPOXY
encapsulated code	HVQCCN
Encapsulate equivalent code	LCC28,.16X.2,20
Package shape	RECTANGULAR
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	250
Certification status	Not Qualified
Maximum seat height	0.8 mm
surface mount	YES
Switch configuration	PHASE-SHIFT
Maximum switching frequency	900 kHz
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn)
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	40
width	4 mm

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FEATURES

LTC3868-1

Low I

, Dual

2-Phase Synchronous

Step-Down Controller

DESCRIPTION

The LTC

3868-1 is a high performance dual step-down

switching regulator controller that drives all N-channel

synchronous power MOSFET stages. A constant frequency

current mode architecture allows a phase-lockable fre-

quency of up to 850kHz. Power loss and noise due to the

input capacitor ESR are minimized by operating the two

controller outputs out of phase.

The 170μA no-load quiescent current extends operating

life in battery powered systems. OPTI-LOOP compensation

allows the transient response to be optimized over a wide

range of output capacitance and ESR values. The LTC3868-

1 features a precision 0.8V reference and a power good

output indicator. A wide 4V to 24V input supply range

encompasses a wide range of intermediate bus voltages

and battery chemistries.

Independent soft-start pins for each controller ramp the

output voltages during start-up. Current foldback limits

MOSFET heat dissipation during short-circuit conditions.

The output short-circuit latchoff feature further protects

the circuit in short-circuit conditions.

For a leadless 32-pin QFN package with the additional fea-

tures of adjustable current limit, clock out, phase modula-

tion and two PGOOD outputs, see the LTC3868 data sheet.

LT, LTC, LTM, Burst Mode, OPTI-LOOP μModule, Linear Technology and the Linear logo

are registered trademarks and No R

SENSE

and UltraFast are 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.

Low Operating I

: 170μA (One Channel On)

Wide Output Voltage Range: 0.8V ≤ V

OUT

≤ 14V

Wide V

Range: 4V to 24V

SENSE

or DCR Current Sensing

Out-of-Phase Controllers Reduce Required Input

Capacitance and Power Supply Induced Noise

OPTI-LOOP

Compensation Minimizes C

OUT

Phase-Lockable Frequency (75kHz to 850kHz)

Programmable Fixed Frequency (50kHz to 900kHz)

Selectable Continuous, Pulse-Skipping or

Burst Mode

Operation at Light Loads

Very Low Dropout Operation: 99% Duty Cycle

Adjustable Output Voltage Soft-Start

Power Good Output Voltage Monitor

Output Overvoltage Protection

Output Latchoff Protection During Short Circuit

Low Shutdown I

: 8μA

Internal LDO Powers Gate Drive from V

or EXTV

No Current Foldback During Start-Up

Small 4mm

5mm QFN and Narrow SSOP Packages

APPLICATIONS

Notebook and Palmtop Computers

Portable Instruments

Battery Operated Digital Devices

Distributed DC Power Systems

TYPICAL APPLICATION

High Efﬁciency Dual 8.5V/3.3V Step-Down Converter

4.7μF

TG1

0.1μF

3.3μH

BOOST1

SW1

BG1

LTC3868-1

SENSE1

0.007Ω

OUT1

3.3V

SENSE1

–

62.5k

150μF

20k

FB1

TH1

680pF

15k

0.1μF

SS1

SGND

SENSE2

FB2

TH2

SS2

0.1μF

–

22μF

50V

9V TO 24V

100

Efﬁciency and Power Loss

vs Load Current

10000

INTV

TG2

BOOST2

SW2

EFFICIENCY (%)

BG2

PGND

SENSE2

0.01Ω

OUT2

8.5V

3.5A

150μF

0.1μF

7.2μH

EFFICIENCY

POWER LOSS

0.0001

0.001

= 12V

OUT

= 3.3V

FIGURE 12 CIRCUIT

0.01

0.1

OUTPUT CURRENT (A)

38681 TA01b

1000

POWER LOSS (mW)

100

193k

680pF

15k

20k

0.1

38681 TA01

38681fd

LTC3868IUFD-1#TRPBF Related Products

	LTC3868IUFD-1#TRPBF	LTC3868EGN-1#TRPBF	LTC3868IUFD-1#PBF	LTC3868IGN-1#TRPBF	LTC3868EUFD-1#TRPBF	LTC3868EGN-1#PBF	LTC3868IGN-1#PBF	LTC3868EUFD-1#PBF
Description	IC REG CTRLR BUCK 28QFN	IC REG CTRLR BUCK 28SSOP	IC REG CTRLR BUCK 28QFN	IC REG CTRLR BUCK 28SSOP	IC REG CTRLR BUCK 28QFN	IC REG CTRLR BUCK 28SSOP	IC REG CTRLR BUCK 28SSOP	IC REG CTRLR BUCK 28QFN
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	QFN	SSOP	QFN	SSOP	QFN	SSOP	SSOP	QFN
package instruction	HVQCCN, LCC28,.16X.2,20	SSOP, SSOP28,.25	HVQCCN, LCC28,.16X.2,20	SSOP, SSOP28,.25	HVQCCN, LCC28,.16X.2,20	SSOP, SSOP28,.25	SSOP, SSOP28,.25	HVQCCN, LCC28,.16X.2,20
Contacts	28	28	28	28	28	28	28	28
Manufacturer packaging code	UFD	GN	UFD	GN	UFD	GN	GN	UFD
Reach Compliance Code	compliant	compliant	compliant	compliant	compliant	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Other features	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 14V
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	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	24 V	24 V	24 V	24 V	24 V	24 V	24 V	24 V
Minimum input voltage	4 V	4 V	4 V	4 V	4 V	4 V	4 V	4 V
Nominal input voltage	12 V	12 V	12 V	12 V	12 V	12 V	12 V	12 V
JESD-30 code	R-PQCC-N28	R-PDSO-G28	R-PQCC-N28	R-PDSO-G28	R-PQCC-N28	R-PDSO-G28	R-PDSO-G28	R-PQCC-N28
JESD-609 code	e3	e3	e3	e3	e3	e3	e3	e3
length	5 mm	9.893 mm	5 mm	9.893 mm	5 mm	9.893 mm	9.893 mm	5 mm
Humidity sensitivity level	1	1	1	1	1	1	1	1
Number of functions	1	1	1	1	1	1	1	1
Number of terminals	28	28	28	28	28	28	28	28
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C
Nominal output voltage	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HVQCCN	SSOP	HVQCCN	SSOP	HVQCCN	SSOP	SSOP	HVQCCN
Encapsulate equivalent code	LCC28,.16X.2,20	SSOP28,.25	LCC28,.16X.2,20	SSOP28,.25	LCC28,.16X.2,20	SSOP28,.25	SSOP28,.25	LCC28,.16X.2,20
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	250	260	250	260	250	260	260	260
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	0.8 mm	1.75 mm	0.8 mm	1.75 mm	0.8 mm	1.75 mm	1.75 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	900 kHz	900 kHz	900 kHz	900 kHz	900 kHz	900 kHz	900 kHz	900 kHz
technology	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Temperature level	INDUSTRIAL	OTHER	INDUSTRIAL	INDUSTRIAL	OTHER	OTHER	INDUSTRIAL	OTHER
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	NO LEAD	GULL WING	NO LEAD	GULL WING	NO LEAD	GULL WING	GULL WING	NO LEAD
Terminal pitch	0.5 mm	0.635 mm	0.5 mm	0.635 mm	0.5 mm	0.635 mm	0.635 mm	0.5 mm
Terminal location	QUAD	DUAL	QUAD	DUAL	QUAD	DUAL	DUAL	QUAD
Maximum time at peak reflow temperature	40	30	40	30	40	30	30	30
width	4 mm	3.9 mm	4 mm	3.9 mm	4 mm	3.9 mm	3.9 mm	4 mm

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