LT3781_09 datasheet(2/20 Pages) LINER

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LT3781

3781f

The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.

VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF.

ELECTRICAL CHARACTERISTICS

Power Supply (VCC)

Low Impedance Source Voltage ............. –0.3V to 20V

Shutdown Mode:

(Supply Self-Regulates to 18V)

Maximum Input Current ............................... 20mA

Topside Supply (VBST) ....................................................

VBSTREF – 0.3V to VBSTREF +20V (VBST(MAX) = 90V)

Topside Reference Pin (VBSTREF) ............... –0.6V to 75V

SHDN Pin Voltage ........................... –0.3V to VCC + 0.3V

All Other Input Voltages .............. –0.3V to 5VREF + 0.3V

5VREF Pin Sink Current ......................................... 10mA

FSET Pin Current ...................................... –2mA to 5mA

All Other Input Pin Currents ...................... –2mA to 2mA

Operating Ambient

Temperature Range (Note 4) ...............–40

°C to 85°C

Operating Junction

Temperature Range ...............................–40

°C to 125°C

Storage Temperature Range ..................–65

°C to 150°C

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

°C

ORDER PART

NUMBER

TJMAX = 125°C, θJA = 90°C/W

LT3781EG

LT3781IG

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

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

TOP VIEW

G PACKAGE

20-LEAD PLASTIC SSOP

SHDN

OVLO

THERM

SGND

5VREF

FSET

SYNC

VFB

VBST

BSTREF

PWRGND

VCC

SENSE

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply and Protection

VCCUVLO

Undervoltage Lockout Threshold

Falling Edge

8.0

8.4

8.6

Rising Edge

14.5

VCCSHDN

Shutdown Mode Shunt Regulator

100

µA < IVCC ≤ 10mA

16.5

19.9

ICC

DC Active Supply Current

(Note 2)

DC Active UVLO Supply Current

VSHDN = 1.35V, VCC = 8V

800

1200

µA

DC Standby Supply Current

VSHDN < 0.3V

µA

VBST

DC Active Supply Current

TG Logic High (Note 2)

5.0

8.5

DC Standby Supply Current

VSHDN < 0.3V

0.1

µA

VSHDN

Shutdown Rising Threshold

1.15

1.25

1.35

Shutdown Threshold Hysteresis

100

150

200

ISS

Soft-Start Charge Current

VSS = 2V

–14

– 10

– 6

µA

VSS

Soft-Start Reset Threshold

225

VBSTUVLO Boost Undervoltage Lockout

Falling Edge

5.7

6.4

7.1

(VBST-BSTREF)

Rising Edge

6.5

7.0

7.5

Boost UVLO Hysteresis

0.3

0.6

5V External Reference

V5VREF

5V Reference Voltage

≤ (I5VREF – IVC) < 20mA

4.85

5.0

5.10

4.80

5.15

I5VREFSC

Short-Circuit Current

Source, IVC = 0

R5VREF

Output Impedance

≤ (I5VREF – IVC) < 20mA

Ω

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