LTC3850EUF#TR datasheet, PDF - EEWORLD Datasheet

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LTC3850EUF#TR: DescriptionIC 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PQCC28, 4 X 4 MM, PLASTIC, QFN-28, Switching Regulator or Controller; CategoryPower/power management The power supply circuit; File Size475KB，32 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC3850EUF#TR Overview

IC 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PQCC28, 4 X 4 MM, PLASTIC, QFN-28, Switching Regulator or Controller

LTC3850EUF#TR Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	QFN
package instruction	HVQCCN, LCC28,.16SQ,16
Contacts	28
Reach Compliance Code	not_compliant
ECCN code	EAR99
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	15 V
JESD-30 code	S-PQCC-N28
JESD-609 code	e0
length	4 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	28
Maximum operating temperature	85 °C
Minimum operating temperature
Maximum output current	0.1 A
Package body material	PLASTIC/EPOXY
encapsulated code	HVQCCN
Encapsulate equivalent code	LCC28,.16SQ,16
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	235
Certification status	Not Qualified
Maximum seat height	0.8 mm
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	860 kHz
technology	CMOS
Temperature level	COMMERCIAL EXTENDED
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	NO LEAD
Terminal pitch	0.4 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	20
width	4 mm

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FEATURES

■

LTC3850

Dual, 2-Phase

Synchronous Step-Down

Switching Controller

DESCRIPTION

The LTC

3850 is a high performance dual synchronous

step-down switching regulator controller that drives all

N-channel power MOSFET stages. A constant-frequency

current mode architecture allows a phase-lockable fre-

quency of up to 780kHz. Power loss and supply noise are

minimized by operating the two controller output stages

out of phase.

OPTI-LOOP

compensation allows the transient response

to be optimized over a wide range of output capacitance

and ESR values. The LTC3850 features a precision 0.8V

reference and a power good output indicator. A wide 4V

to 24V (28V maximum) input supply range encompasses

most battery chemistries and intermediate bus voltages.

Independent TK/SS pins for each controller ramp the

output voltages during start-up. Current foldback limits

MOSFET heat dissipation during short-circuit condi-

tions.The MODE/PLLIN pin selects among Burst Mode

operation, pulse-skipping mode, or continuous inductor

current mode and allows the IC to be synchronized to an

external clock.

The LTC3850 is available in both low proﬁle 28-pin 4mm

4mm QFN and narrow SSOP packages.

Dual, 180° Phased Controllers Reduce Required

Input Capacitance and Power Supply Induced Noise

High Efﬁciency: Up to 95%

SENSE

or DCR Current Sensing

±1% 0.8V Output Voltage Accuracy

Phase-Lockable Fixed Frequency 250kHz to 780kHz

Supports Pre-Biased Output

Dual N-Channel MOSFET Synchronous Drive

Wide V

Range: 4V to 24V Operation

Adjustable Soft-Start Current Ramping or Tracking

Foldback Output Current Limiting

Output Overvoltage Protection

Power Good Output Voltage Monitor

28-Pin 4mm

4mm QFN and Narrow SSOP Packages

APPLICATIONS

■

Notebook and Palmtop Computers

Portable Instruments

Battery-Operated Digital Devices

DC Power Distribution Systems

, LT, LTC, LTM, Burst Mode and OPTI-LOOP 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.

TYPICAL APPLICATION

High Efﬁciency Dual 3.3V/2.5V Step-Down Converter

4.7µF

PGOOD INTV

0.1µF

2.2µH

TG1

BOOST1

SW1

BG1

2.2k

500kHz

LTC3850

TG2

BOOST2

SW2

BG2

PGND

SENSE2

RUN2

SENSE2

–

FB2

TH2

SGND

TK/SS2

0.1µF

10nF

10k

220pF

15k

20k

3850 TA01

Efﬁciency

22µF

50V

7V TO

24V

100

= 12V

95 V

OUT

= 3.3V

10000

EFFICIENCY

0.1µF

2.2µH

2.2k

POWER LOSS (mW)

MODE/PLLIN

LIM

EFFICIENCY (%)

1000

FREQ/PLLFLTR

0.1µF

OUT2

2.5V

100µF

100

POWER LOSS

0.1µF

OUT1

3.3V

100µF

SENSE1

RUN1

SENSE1

–

FB1

TH1

TK/SS1

0.1µF

100

1000

LOAD CURRENT (mA)

10000

3850 TA01b

63.4k

220pF

20k

15k

43.2k

3850f

LTC3850EUF#TR Related Products

	LTC3850EUF#TR	LTC3850EUF	LTC3850EGN#TR	LTC3850EGN
Description	IC 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PQCC28, 4 X 4 MM, PLASTIC, QFN-28, Switching Regulator or Controller	IC 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PQCC28, 4 X 4 MM, PLASTIC, QFN-28, Switching Regulator or Controller	IC 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PDSO28, 0.150 INCH, PLASTIC, SSOP-28, Switching Regulator or Controller	IC 0.1 A DUAL SWITCHING CONTROLLER, 860 kHz SWITCHING FREQ-MAX, PDSO28, 0.150 INCH, PLASTIC, SSOP-28, Switching Regulator or Controller
Is it lead-free?	Contains lead	Contains lead	Contains lead	Contains lead
Is it Rohs certified?	incompatible	incompatible	incompatible	incompatible
Maker	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	QFN	QFN	SSOP	SSOP
package instruction	HVQCCN, LCC28,.16SQ,16	HVQCCN, LCC28,.16SQ,16	SSOP, SSOP28,.25	SSOP, SSOP28,.25
Contacts	28	28	28	28
Reach Compliance Code	not_compliant	not_compliant	not_compliant	_compli
ECCN code	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	24 V	24 V	24 V	24 V
Minimum input voltage	4 V	4 V	4 V	4 V
Nominal input voltage	15 V	15 V	15 V	15 V
JESD-30 code	S-PQCC-N28	S-PQCC-N28	R-PDSO-G28	R-PDSO-G28
JESD-609 code	e0	e0	e0	e0
length	4 mm	4 mm	9.893 mm	9.893 mm
Humidity sensitivity level	1	1	1	1
Number of functions	1	1	1	1
Number of terminals	28	28	28	28
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C
Maximum output current	0.1 A	0.1 A	0.1 A	0.1 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HVQCCN	HVQCCN	SSOP	SSOP
Encapsulate equivalent code	LCC28,.16SQ,16	LCC28,.16SQ,16	SSOP28,.25	SSOP28,.25
Package shape	SQUARE	SQUARE	RECTANGULAR	RECTANGULAR
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	235	255	235	255
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	0.8 mm	0.8 mm	1.75 mm	1.75 mm
surface mount	YES	YES	YES	YES
Switch configuration	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	860 kHz	860 kHz	860 kHz	860 kHz
technology	CMOS	CMOS	CMOS	CMOS
Temperature level	COMMERCIAL EXTENDED	COMMERCIAL EXTENDED	COMMERCIAL EXTENDED	COMMERCIAL EXTENDED
Terminal surface	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal form	NO LEAD	NO LEAD	GULL WING	GULL WING
Terminal pitch	0.4 mm	0.4 mm	0.635 mm	0.635 mm
Terminal location	QUAD	QUAD	DUAL	DUAL
Maximum time at peak reflow temperature	20	40	20	40
width	4 mm	4 mm	3.899 mm	3.899 mm

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