LINEAR TECHNOLOGY LTC4440 Technical data

FEATURES

LTC4440

High Speed, High Voltage

High Side Gate Driver

U

DESCRIPTIO

■

Wide Operating VIN Range: Up to 80V

■

Rugged Architecture Tolerant of 100V V

IN

Transients

■

Powerful 1.5Ω Driver Pull-Down

■

Powerful 2.4A Peak Current Driver Pull-Up

■

7ns Fall Time Driving 1000pF Load

■

10ns Rise Time Driving 1000pF Load

■

Drives Standard Threshold MOSFETs

■

TTL/CMOS Compatible Inputs with Hysteresis

■

Input Thresholds are Independent of Supply

■

Undervoltage Lockout

■

Low Profile (1mm) SOT-23 (ThinSOT)TM and
Thermally Enhanced 8-Pin MSOP Packages

U

APPLICATIO S

■

Telecommunications Power Systems

■

Distributed Power Architectures

■

Server Power Supplies

■

High Density Power Modules

The LTC®4440 is a high frequency high side N-channel
MOSFET gate driver that is designed to operate in applica­tions with VIN voltages up to 80V. The LTC4440 can also
withstand and continue to function during 100V VIN tran­sients. The powerful driver capability reduces switching
losses in MOSFETs with high gate capacitances. The
LTC4440’s pull-up has a peak output current of 2.4A and
its pull-down has an output impedance of 1.5Ω.

The LTC4440 features supply independent TTL/CMOS
compatible input thresholds with 350mV of hysteresis.
The input logic signal is internally level-shifted to the
bootstrapped supply, which may function at up to 115V
above ground.

The LTC4440 contains both high side and low side under­voltage lockout circuits that disable the external MOSFET
when activated.

The LTC4440 is available in the low profile (1mm) SOT-23
and thermally enhanced 8-lead MSOP packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6677210.

TYPICAL APPLICATIO

Synchronous Phase-Modulated Full-Bridge Converter

V

IN

100V PEAK TRANSIENT

36V TO 72V

(ABS MAX)

V

8V TO 15V

CC

V

CC

LTC3722-1

U

LTC4440

V

CC

INP

GND

LTC4440

V

CC

INP

GND

BOOST

BOOST

LTC4440 Driving a 1000pF

Capacitive Load

INPUT

(INP)

TG

TS

••

TG

TS

4440 TA01

2V/DIV

OUTPUT

(TG – TS)

5V/DIV

10ns/DIV 4440 F02

4440f

1

LTC4440

1
2
3
4

INP

GND

V

CC

GND

8
7
6
5

TS
TG
BOOST
NC

TOP VIEW

9

MS8E PACKAGE

8-LEAD PLASTIC MSOP

WW

W

ABSOLUTE MAXIMUM RATINGS

U

(Note 1)

Supply Voltage

VCC....................................................... –0.3V to 15V

BOOST – TS ......................................... –0.3V to 15V

INP Voltage............................................... –0.3V to 15V

BOOST Voltage (Continuous) ................... – 0.3V to 95V

BOOST Voltage (100ms) ........................ – 0.3V to 115V

TS Voltage (Continuous) ............................. – 5V to 80V

TS Voltage (100ms)................................... –5V to 100V

U

W

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

LTC4440EMS8E

MS8E

T

= 125°C, θJA = 40°C/W (NOTE 4)

JMAX

EXPOSED PAD IS GND (PIN 9)

MUST BE SOLDERED TO PCB

PART MARKING

LTF9

Peak Output Current < 1µs (TG) ............................... 4A

Driver Output TG (with Respect to TS) ..... –0.3V to 15V

Operating Ambient Temperature Range

(Note 2) .............................................. – 40°C to 85°C

Junction Temperature (Note 3)............................ 125°C

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

Lead Temperature (Soldering, 10 sec).................. 300°C

U

ORDER PART

TOP VIEW

VCC 1

GND 2

INP 3

S6 PACKAGE

6-LEAD PLASTIC SOT-23

T

= 125°C, θJA = 230°C/W

JMAX

6 BOOST

5 TG

4 TS

NUMBER

LTC4440ES6

PART MARKING

LTZY

S6

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

The ● denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Main Supply (VCC)

I

VCC

UVLO Undervoltage Lockout Threshold VCC Rising ● 5.7 6.5 7.3 V

Bootstrapped Supply (BOOST – TS)

I

BOOST

UVLO

Input Signal (INP)

V

IH

V

IL

VIH – VILInput Voltage Hysteresis 0.350 V

I

INP

2

DC Supply Current
Normal Operation INP = 0V 250 400 µA
UVLO V

DC Supply Current
Normal Operation INP = 0V 110 180 µA
UVLO V

Undervoltage Lockout Threshold V

HS

High Input Threshold INP Ramping High ● 1.3 1.6 2 V

Low Input Threshold INP Ramping Low ● 0.85 1.25 1.6 V

Input Pin Bias Current ±0.01 ±2 µA

< UVLO Threshold (Falling) – 0.1V 25 80 µA

CC

Falling ● 5.4 6.2 7.0 V

V

CC

Hysteresis 300 mV

– VTS < UVLO

BOOST

– VTS Rising ● 6.75 7.4 7.95 V

BOOST

– VTS Falling ● 6.25 6.9 7.60 V

V

BOOST

Hysteresis 500 mV

HS(FALLING)

= 12V, VTS = GND = 0V, unless otherwise noted.

BOOST

– 0.1V, VCC = INP = 5V 86 170 µA

4440f

LTC4440

BOOST – TS SUPPLY VOLTAGE (V)

8

OUTPUT (TG – TS) VOLTAGE (mV)

150

155

160

165

170

11 13

4440 G03

145

140

910

12 14 15

ITG = 100mA
T

A

= 25°C

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at T

The ● denotes specifications which apply over the full operating

= 25°C. VCC = V

A

= 12V, VTS = GND = 0V, unless otherwise noted.

BOOST

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Gate Driver (TG)

V

OH

V

OL

I

PU

R

DS

High Output Voltage ITG = –10mA, VOH = V

BOOST

– V

TG

0.7 V

Low Output Voltage ITG = 100mA ● 150 220 mV
Peak Pull-Up Current ● 1.7 2.4 A
Output Pull-Down Resistance ● 1.5 2.2 Ω

Switching Timing

t

r

Output Rise Time 10% – 90%, CL = 1nF 10 ns

10% – 90%, CL = 10nF 100 ns

t

f

t

PLH

t

PHL

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: The LTC4440 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation

Output Fall Time 10% – 90%, CL = 1nF 7 ns

10% – 90%, C

= 10nF 70 ns

L

Output Low-High Propagation Delay ● 30 65 ns
Output High-Low Propagation Delay ● 28 65 ns

Note 3: T

is calculated from the ambient temperature TA and power

J

dissipation PD according to the following formula:

= TA + (PD • θJA°C/W)

T

J

Note 4: Failure to solder the exposed back side of the MS8E package to
the PC board will result in a thermal resistance much higher than 40°C/W.

with statistical process controls.

UW

TYPICAL PERFOR A CE CHARACTERISTICS

V

300

250

200

150

100

QUIESCENT CURRENT (µA)

50

0

Supply Quiescent Current

CC

vs Voltage

TA = 25°C

0

510

VCC SUPPLY VOLTAGE (V)

INP = 0V

INP = V

CC

15

4440 G01

BOOST – TS Supply Quiescent
Current vs Voltage

500

TA = 25°C

450

400

350

300

250

200

150

QUIESCENT CURRENT (µA)

100

50

0

0

5

BOOST – TS SUPPLY VOLTAGE (V)

INP = V

INP = 0V

Output Low Voltage (VOL)
vs Supply Voltage

CC

10

15

4440 G02

4440f

3

LTC4440

TEMPERATURE (°C)

–60

INPUT THRESHOLD (V)

1.6

1.8

2.0

12090

4440 G12

1.4

1.2

0.8
–30

30060

1.0

VIH (VCC = 15V)

VIL (VCC = 15V)

VIH (VCC = 8V)

VIL (VCC = 8V)

VIH (VCC = 12V)

VIL (VCC = 12V)

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Output High Voltage (VOH)
vs Supply Voltage

15

TA = 25°C

14

13

12

ITG = –10mA

11

10

9

OUTPUT VOLTAGE (TG – TS) (V)

8

7

910 12

8

BOOST – TS SUPPLY VOLTAGE (V)

ITG = –1mA

11

2MHz Operation

INPUT

(INP)

5V/DIV

OUTPUT

(TG)

5V/DIV

V

= 12V 250ns/DIV 4440 G07

CC

ITG = –100mA

13 14 15

4440 G04

Input Thresholds (INP)
vs Supply Voltage

2.0
TA = 25°C

1.8

1.6

1.4

1.2

INPUT THRESHOLD (V)

1.0

0.8

(INPUT HIGH THRESHOLD)

(INPUT LOW THRESHOLD)

7

9111315

VCC SUPPLY VOLTAGE (V)

V

IH

V

IL

VCC Supply Current (VCC = 12V)
vs Temperature

300

250

200

150

CURRENT (µA)

100

50

0

–60

–30

INP = 0V

INP = 12V

30060

TEMPERATURE (°C)

4440 G05

12090

4440 G08

VCC Supply Current
at TTL Input Levels

380

TA = 25°C

360

340

320

300

280

260

240

SUPPLY QUIESCENT CURRENT (µA)

CC

220

V

200

8

INP = 2V

INP = 0.8V

10

VCC SUPPLY VOLTAGE (V)

VCC Undervoltage Lockout
Thresholds vs Temperature

6.55

6.50

6.45

6.40

6.35

6.30

SUPPLY VOLTAGE (V)

CC

6.25

V

6.20

6.15
–60

RISING THRESHOLD

FALLING THRESHOLD

–30

TEMPERATURE (°C)

30060

12

14

4440 G06

12090

4440 G09

Boost Supply Current
vs Temperature

500

450

400

350

4

300

250

200

CURRENT (µA)

150

100

50

0

–60

INP = 12V

–30

TEMPERATURE (°C)

INP = 0V

30060

12090

4440 G10

Boost Supply (BOOST – TS)
Undervoltage Lockout Thresholds
vs Temperature Input Threshold vs Temperature

7.6

7.5

7.4

7.3

7.2

7.1

7.0

6.9

BOOST – TS SUPPLY VOLTAGE (V)

6.8

6.7
–60

RISING THRESHOLD

FALLING THRESHOLD

–30

TEMPERATURE (°C)

30060

4440 G11

12090

4440f