LTC3892HUH-2#TRPBF datasheet, PDF

FEATURES

n

LTC3892/

LTC3892-1/LTC3892-2

60V Low I

Q

, Dual, 2-Phase

Synchronous Step-Down

DC/DC Controller

DESCRIPTION

The

LTC

®

3892/LTC3892-1/LTC3892-2

is a high perfor-

mance dual step-down DC/DC switching regulator control-

ler that drives all N-channel synchronous power MOSFET

stages. Power loss and noise are minimized by operating

the two controller output stages out-of-phase.

The gate drive voltage can be programmed from 5V to

10V to allow the use of logic or standard-level FETs and

to maximize efficiency. Internal switches in the top gate

drivers eliminate the need for external bootstrap diodes.

A wide 4.5V to 60V input supply range encompasses a wide

range of intermediate bus voltages and battery chemistries.

Output voltages up to 99% of V

IN

can be regulated. OPTI-

LOOP

®

compensation allows the transient response and

loop stability to be optimized over a wide range of output

capacitance and ESR values.

The 29μA no-load quiescent current extends operating run

time in battery powered systems. For a comparison of the

LTC3892 to the LTC3892-1 and LTC3892-2, see Table 1

in the Pin Functions section of this data sheet.

L,

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

registered trademarks of Analog Devices, Inc. All other trademarks are the property of their

respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194,

6177787, 6580258.

n

Wide V

IN

Range: 4.5V to 60V (65V Abs Max)

Wide Output Voltage Range: 0.8V ≤ V

OUT

≤ 99% • V

IN

Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)

No External Bootstrap Diodes Required

Low Operating I

Q

: 29μA (One Channel On)

Selectable Gate Drive UVLO Thresholds

Out-of-Phase Operation Reduces Required Input

Capacitance and Power Supply Induced Noise

Phase-Lockable Frequency: 75kHz to 850kHz

Selectable Continuous, Pulse Skipping or Low Ripple

Burst Mode

®

Operation at Light Loads

Selectable Current Limit (LTC3892/LTC3892-2)

Very Low Dropout Operation: 99% Duty Cycle

Power Good Output Voltage Monitors (LTC3892/LTC3892-2)

Low Shutdown I

Q

: 3.6μA

Small 32-Lead 5mm

×

5mm QFN Package (LTC3892/

LTC3892-2) or TSSOP Package (LTC3892-1)

APPLICATIONS

n

Automotive and Industrial Power Systems

Distributed DC Power Systems

High Voltage Battery Operated Systems

TYPICAL APPLICATION

High Efficiency Dual 5V/12V Output Step-Down Converter

VIN

12.5V TO 60V

47µF

0.1µF

RUN1

TG1

BOOST1

SW1

BG1

LTC3892

1nF

SENSE1+

SENSE1–

V

FB1

ITH1

TRACK/SS1

VPRG1

7.5k

100pF

2.2nF

0.1µF

INTV

CC

0.1µF

GND

SENSE2+

SENSE2–

V

FB2

ITH2

TRACK/SS2

DRVSET

DRVUV

DRV

CC

4.7µF

3892 TA01

VIN

RUN2

TG2

BOOST2

SW2

BG2

0.1µF

96

15µH

8m

V

OUT2

12V

5A

EFFICIENCY (%)

150µF

100k

95

94

93

92

91

90

7.15k

34.8k

0.1µF

100pF

1nF

89

Efficiency vs Output Current

Efﬁciency vs Output Current

V

IN

= 12V

V

OUT

= 5V

Burst Mode OPERATION

V

OUT1

5V

8A

220µF

5m

5.6µH

1nF

GATE DRIVE

DRV

CC

=5V

DRV

CC

=6V

DRV

CC

=8V

DRV

CC

=10V

0.1

1

LOAD CURRENT (A)

10

3892 F01b

88

0.01

38921fc

For more information

www.linear.com/LTC3892

1

LTC3892/

LTC3892-1/LTC3892-2

ABSOLUTE MAXIMUM RATINGS

(Notes 1, 3)

Input Supply Voltage (V

IN

) ......................... –0.3V to 65V

Top Side Driver Voltages

(BOOST1, BOOST2) ............................... –0.3V to 76V

Switch Voltage (SW1, SW2).......................... –5V to 70V

DRV

CC

, (BOOST1-SW1),

(BOOST2-SW2).......................................–0.3V to 11V

BG1, BG2, TG1, TG2 ........................................... (Note 8)

RUN1, RUN2 Voltages ................................ –0.3V to 65V

SENSE1

+

, SENSE2

+

, SENSE1

–

SENSE2

–

Voltages ................................. –0.3V to 65V

PLLIN/MODE, FREQ Voltages ...................... –0.3V to 6V

EXTV

CC

Voltage ......................................... –0.3V to 14V

I

TH1

, I

TH2

, V

FB1

, V

FB2

Voltages ..................... –0.3V to 6V

DRVSET, DRVUV Voltages ........................... –0.3V to 6V

TRACK/SS1, TRACK/SS2 Voltages .............. –0.3V to 6V

PGOOD1, PGOOD2 Voltages

(LTC3892/LTC3892-2) ............................. –0.3V to 6V

VPRG1, ILIM Voltages

(LTC3892/LTC3892-2) ............................. –0.3V to 6V

Operating Junction Temperature Range (Note 2)

LTC3892E, LTC3892I,

LTC3892E-1, LTC3892I-1,

LTC3892E-2, LTC3892I-2 ................... –40°C to 125°C

LTC3892H,

LTC3892H-1, LTC3892H-2 ................. –40°C to 150°C

LTC3892MP, LTC3892MP-1,

LTC3892MP-2 .................................... –55°C to 150°C

Storage Temperature Range .................. –65°C to 150°C

PIN CONFIGURATION

LTC3892/LTC3892-2

SENSE1

–

SENSE1

+

TOP VIEW

TRACK/SS1

VPRG1

LTC3892-1

ITH1

SW1

TG1

V

FB1

SENSE1

+

24

BOOST1

23

BG1

22

V

IN

33

GND

21

EXTV

CC

20

DRV

CC

19

BG2

18

BOOST2

17

SW2

9 10 11 12 13 14 15 16

SENSE2

–

SENSE2

+

V

FB2

ITH2

DRVUV

DRVSET

TRACK/SS2

TG2

SENSE1

–

FREQ

PLLIN/MODE

INTV

CC

RUN1

RUN2

SENSE2

–

1

2

3

4

5

6

7

8

9

10

29

GND

TOP VIEW

28

TRACK/SS1

27

TG1

26

SW1

25

BOOST1

24

BG1

23

V

IN

22

EXTV

CC

21

DRV

CC

20

BG2

19

BOOST2

18

SW2

17

TG2

16

TRACK/SS2

15

DRVSET

ITH1

V

FB1

32 31 30 29 28 27 26 25

FREQ

PLLIN/MODE

PGOOD1

PGOOD2

INTV

CC

RUN1

RUN2

ILIM

1

2

3

4

5

6

7

8

SENSE2

+

11

V

FB2

12

ITH2

13

DRVUV

14

UH PACKAGE

32-LEAD (5mm

×

5mm) PLASTIC QFN

T

JMAX

= 150°C,

θ

JA

= 44°C/W

EXPOSED PAD (PIN 33) IS GND, MUST BE CONNECTED TO GND

FE PACKAGE

28-LEAD PLASTIC TSSOP

T

JMAX

= 150°C,

θ

JA

= 30°C/W

EXPOSED PAD (PIN 29) IS GND, MUST BE CONNECTED TO GND

2

38921fc

For more information

www.linear.com/LTC3892

LTC3892/

LTC3892-1/LTC3892-2

ORDER INFORMATION

LEAD FREE FINISH

LTC3892EUH#PBF

LTC3892IUH#PBF

LTC3892HUH#PBF

LTC3892MPUH#PBF

LTC3892EFE-1#PBF

LTC3892IFE-1#PBF

LTC3892HFE-1#PBF

LTC3892MPFE-1#PBF

LTC3892EUH-2#PBF

LTC3892IUH-2#PBF

LTC3892HUH-2#PBF

LTC3892MPUH-2#PBF

TAPE AND REEL

LTC3892EUH#TRPBF

LTC3892IUH#TRPBF

LTC3892HUH#TRPBF

LTC3892MPUH#TRPBF

LTC3892EFE-1#TRPBF

LTC3892IFE-1#TRPBF

LTC3892HFE-1#TRPBF

LTC3892MPFE-1#TRPBF

LTC3892EUH-2#TRPBF

LTC3892IUH-2#TRPBF

LTC3892HUH-2#TRPBF

http://www.linear.com/product/LTC3892#orderinfo

PART MARKING*

3892

LTC3892FE-1

38922

PACKAGE DESCRIPTION

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

28-Lead Plastic TSSOP

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

TEMPERATURE RANGE

–40°C to 125°C

–40°C to 150°C

–55°C to 150°C

–40°C to 125°C

–40°C to 150°C

–55°C to 150°C

–40°C to 125°C

–40°C to 150°C

–55°C to 150°C

LTC3892MPUH-2#TRPBF 38922

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to:

http://www.linear.com/tapeandreel/

.

Some packages are available in 500 unit reels through

designated sales channels with #TRMPBF suffix.

38921fc

For more information

www.linear.com/LTC3892

3

LTC3892/

LTC3892-1/LTC3892-2

The

l

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at T

A

= 25°C (Note 2). V

IN

= 12V, V

RUN1,2

= 5V, V

EXTVCC

= 0V, V

DRVSET

= 0V,

VPRG1 = FLOAT unless otherwise noted.

SYMBOL

V

IN

V

FB1

PARAMETER

Input Supply Operating Voltage Range

Channel 1 Regulated Feedback

Voltage

(Note 4) ITH1 Voltage = 1.2V

0°C to 85°C, VPRG1 = FLOAT (LTC3892/LTC3892-2) or LTC3892-1

VPRG1 = FLOAT (LTC3892/LTC3892-2) or LTC3892-1

l

VPRG1 = 0V (LTC3892/LTC3892-2)

l

VPRG1 = INTV

CC

(LTC3892/LTC3892-2)

(Note 4) ITH2 Voltage = 1.2V

0°C to 85°C

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

MIN

4.5

0.792

0.788

3.234

4.890

0.792

0.788

TYP

MAX

60

UNITS

V

nA

µA

%/V

%

mmho

mA

0.800

3.3

5.0

0.800

–2

–0.002

4

0.002

0.808

0.812

3.366

5.110

0.808

0.812

±50

±0.05

6

0.02

0.1

–0.1

V

FB2

I

FB2

I

FB1

Channel 2 Regulated Feedback

Voltage

Channel 2 Feedback Current

Channel 1 Feedback Current

(Note 4)

VPRG1 = FLOAT (LTC3892/LTC3892-2) or LTC3892-1

VPRG1 = 0V (LTC3892/LTC3892-2)

VPRG1 = INTV

CC

(LTC3892/LTC3892-2)

(Note 4) V

IN

= 4.5V to 60V

(Note 4) Measured in Servo Loop,

∆ITH

Voltage = 1.2V to 0.7V

(Note 4) Measured in Servo Loop,

∆ITH

Voltage = 1.2V to 2V

l

V

REFLNREG

V

LOADREG

Reference Voltage Line Regulation

Output Voltage Load Regulation

0.01

–0.01

2

1.6

g

m1,2

I

Q

Transconductance Amplifier g

m

Input DC Supply Current

(Note 4) ITH1,2 = 1.2V, Sink/Source 5µA

(Note 5) V

DRVSET

= 0V

Pulse-Skipping or Forced Continuous RUN1 = 5V and RUN2 = 0V or

Mode (One Channel On)

RUN2 = 5V and RUN1 = 0V,

V

FB1,2

= 0.83V (No Load)

Pulse-Skipping or Forced Continuous RUN1,2 = 5V, V

FB1,2

= 0.83V (No Load)

Mode (Both Channels On)

Sleep Mode (One Channel On)

RUN1 = 5V and RUN2 = 0V or

RUN2 = 5V and RUN1 = 0V,

V

FB1,2

= 0.83V (No Load)

RUN1,2 = 5V, V

FB1,2

= 0.83V (No Load)

RUN1,2 = 0V

DRV

CC

Ramping Up

DRVUV = 0V

DRVUV = INTV

CC

DRV

CC

Ramping Down

DRVUV = 0V

DRVUV = INTV

CC

V

OVL1,2

I

SENSE1,2

+

I

SENSE1,2

–

DF

MAX(TG)

I

TRACK/SS1,2

Feedback Overvoltage Protection

SENSE

+

Pin Current

SENSE

–

Pins Current

Maximum Duty Factor for TG

Soft-Start Charge Current

V

OUT1,2

< V

INTVCC

– 0.5V

V

OUT1,2

> V

INTVCC

+ 0.5V

In Dropout, FREQ = 0V

V

TRACK/SS1,2

= 0V

97.5

8

Measured at V

FB1,2

Relative to Regulated V

FB1,2

(LTC3892/LTC3892-1)

l

2.8

29

55

mA

µA

Sleep Mode (Both Channels On)

Shutdown

UVLO

Undervoltage Lockout

34

3.6

4.0

7.5

3.6

6.4

7

3.8

6.7

10

55

10

4.2

7.8

4.0

7.0

13

±1

µA

V

%

µA

%

µA

700

99

10

±1

12

4

38921fc

For more information

www.linear.com/LTC3892

LTC3892/

LTC3892-1/LTC3892-2

The

l

denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at T

A

= 25°C (Note 2). V

IN

= 12V, V

RUN1,2

= 5V, V

EXTVCC

= 0V, V

DRVSET

= 0V,

VPRG1 = FLOAT unless otherwise noted.

SYMBOL

V

RUN1,2

ON

V

RUN1,2

Hyst

V

SENSE(MAX)

PARAMETER

RUN Pin On Threshold

RUN Pin Hysteresis

Maximum Current Sense Threshold

V

FB1,2

= 0.7V, V

SENSE1,2

– = 3.3V

I

LIM

= FLOAT (LTC3892/LTC3892-2) or LTC3892-1

I

LIM

= 0V (LTC3892/LTC3892-2)

I

LIM

= INTV

CC

(LTC3892/LTC3892-2)

V

FB1,2

= 0.7V, V

SENSE1,2

– = 3.3V

I

LIM

= FLOAT (LTC3892/LTC3892-2) or LTC3892-1

I

LIM

= 0V (LTC3892/LTC3892-2)

I

LIM

= INTV

CC

(LTC3892/LTC3892-2)

V

DRVSET

= INTV

CC

V

DRVSET

= INTV

CC

V

SW

= 0V, V

DRVSET

= INTV

CC

(Note 6) V

DRVSET

= INTV

CC

C

LOAD

= 3300pF

C

LOAD

= 3300pF

(Note 6) V

DRVSET

= INTV

CC

C

LOAD

= 3300pF

C

LOAD

= 3300pF

C

LOAD

= 3300pF Each Driver, V

DRVSET

= INTV

CC

C

LOAD

= 3300pF Each Driver, V

DRVSET

= INTV

CC

(Note 7) V

DRVSET

= INTV

CC

l

ELECTRICAL CHARACTERISTICS

CONDITIONS

V

RUN1

, V

RUN2

Rising

l

MIN

1.22

TYP

1.275

75

MAX

1.33

UNITS

V

mV

66

43

90

–8

75

50

100

0

2.2

1.0

2.2

1.0

3.7

84

58

109

8

mV

Ω

V

SENSE(MATCH)

Matching Between V

SENSE1(MAX)

and

V

SENSE2(MAX)

Gate Driver

TG1,2

BG1,2

BDSW1,2

Pull-Up On-Resistance

Pull-Down On-Resistance

Pull-Up On-Resistance

Pull-Down On-Resistance

BOOST to DRV

CC

Switch On-

Resistance

TG Transition Time:

Rise Time

Fall Time

BG Transition Time:

Rise Time

Fall Time

Top Gate Off to Bottom Gate On

Delay

Synchronous Switch-On Delay Time

Bottom Gate Off to Top Gate On

Delay

Top Switch-On Delay Time

TG Minimum On-Time

TG1,2 t

r

TG1,2 t

f

BG1,2 t

r

BG1,2 t

f

TG/BG t

1D

BG/TG t

1D

t

ON(MIN)1,2

V

DRVCC(INT)

V

LDOREG(INT)

V

DRVCC(EXT)

V

LDOREG(EXT)

V

EXTVCC

V

LDOHYS

V

DRVCC(50kΩ)

V

DRVCC(70kΩ)

V

DRVCC(90kΩ)

25

15

25

15

55

ns

50

ns

80

ns

DRV

CC

Linear Regulator

DRV

CC

Voltage from Internal V

IN

LDO V

EXTVCC

= 0V

7V < V

IN

< 60V, DRVSET = 0V

11V < V

IN

< 60V, DRVSET = INTV

CC

DRV

CC

Load Regulation from V

IN

LDO

I

CC

= 0mA to 50mA, V

EXTVCC

= 0V

5.8

9.6

5.8

9.6

6.0

10.0

0.9

6.0

10.0

0.7

6.2

10.4

2.0

6.2

10.4

2.0

V

%

V

%

DRV

CC

Voltage from Internal EXTV

CC

7V < V

EXTVCC

< 13V, DRVSET = 0V

LDO

11V < V

EXTVCC

< 13V, DRVSET = INTV

CC

DRV

CC

Load Regulation from Internal I

CC

= 0mA to 50mA, V

EXTVCC

= 8.5V,

EXTV

CC

LDO

V

DRVSET

= 0V

EXTV

CC

LDO Switchover Voltage

EXTV

CC

Ramping Positive

DRVUV = 0V

DRVUV = INTV

CC

EXTV

CC

Hysteresis

Programmable DRV

CC

Programmable DRV

CC

Programmable DRV

CC

R

DRVSET

= 50kΩ, V

EXTVCC

= 0V

R

DRVSET

= 70kΩ, V

EXTVCC

= 0V

R

DRVSET

= 90kΩ, V

EXTVCC

= 0V

4.5

7.4

4.7

7.7

250

5.0

4.9

8.0

V

mV

V

6.4

7.0

9.0

7.6

V

38921fc

For more information

www.linear.com/LTC3892

5

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Objectid	8148786118
Parts packaging code	QFN
package instruction	QFN-32
Contacts	32
Manufacturer packaging code	UH
Reach Compliance Code	compliant
Other features	ALSO HAS 5V OUTPUT; OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 59.4V
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PHASE-SHIFT CONTROL
Maximum input voltage	60 V
Minimum input voltage	4.5 V
Nominal input voltage	12 V
JESD-30 code	S-PQCC-N32
JESD-609 code	e3
length	5 mm
Number of functions	1
Number of terminals	32
Nominal output voltage	3.3 V
Package body material	PLASTIC/EPOXY
encapsulated code	HVQCCN
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Maximum seat height	0.8 mm
surface mount	YES
Switch configuration	BUCK
technology	CMOS
Terminal surface	MATTE TIN
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
width	5 mm

LTC3892HUH-2#TRPBF

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