LT8645S/LT8646S

3

Rev. B

For more information www.analog.com

ELECTRICAL CHARACTERISTICS The

l

denotes the specifications which apply over the full operating

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

ORDER INFORMATION

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

l

3.0

3.4

V

VIN Quiescent Current in Shutdown

VEN/UV = 0V

l

0.9

0.9

3

10

µA

µA

LT8645S VIN Quiescent Current in Sleep

(Internal Compensation)

VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V

l

1.7

1.7

4

10

µA

µA

LT8646S VIN Quiescent Current in Sleep

(External Compensation)

VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 0V

l

230

230

290

340

µA

µA

VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V

16

25

µA

LT8646S BIAS Quiescent Current in Sleep

VEN/UV = 2V, VFB > 0.97V, VSYNC = 0V, VBIAS = 5V

200

260

µA

LT8645S VIN Quiescent Current when Active VEN/UV = 2V, VFB > 0.97V, VSYNC = 2V, RT = 60.4k, VBIAS = 0V

0.4

0.6

mA

LT8646S VIN Quiescent Current when Active VEN/UV = 2V, VFB > 0.97V, VSYNC = 2V, RT = 60.4k, VBIAS = 0V

0.6

0.8

mA

LT8645S VIN Current in Regulation

VOUT = 0.97V, VIN = 6V, ILOAD = 100µA, VSYNC = 0V

VOUT = 0.97V, VIN = 6V, ILOAD = 1mA, VSYNC = 0V

l

l

17

200

60

400

µA

µA

Feedback Reference Voltage

VIN = 6V

VIN = 6V

l

0.964

0.958

0.970

0.970

0.976

0.982

V

V

Feedback Voltage Line Regulation

VIN = 4.0V to 42V

l

0.004

0.025

%/V

Feedback Pin Input Current

VFB = 1V

–20

20

nA

LT8646S Error Amp Transconductance

VC = 1.25V

1.7

mS

LT8646S Error Amp Gain

350

V/V

LT8646S VC Source Current

VFB = 0.77V, VC = 1.25V

350

µA

LT8646S VC Sink Current

VFB = 1.17V, VC = 1.25V

350

µA

PART NUMBER

PART MARKING*

FINISH CODE

PAD FINISH

PACKAGE TYPE***

MSL

RATING

TEMPERATURE RANGE

LT8645SEV#PBF

8645SV

e4

Au (RoHS)

LQFN (Laminate Package

with QFN Footprint)

3

–40°C to 125°C

LT8645SIV#PBF

LT8646SEV#PBF

8646SV

LT8646SIV#PBF

AUTOMOTIVE PRODUCTS**

LT8645SEV#WPBF

8645SV

e4

Au (RoHS)

LQFN (Laminate Package

with QFN Footprint)

3

–40°C to 125°C

LT8645SIV#WPBF

LT8646SEV#WPBF

8646SV

LT8646SIV#WPBF

• Contact the factory for parts specified with wider operating temperature

ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609.

• Recommended LGA and BGA PCB Assembly and Manufacturing

Procedures

• LGA and BGA Package and Tray Drawings

Parts ending with PBF are RoHS and WEEE compliant. ***The LT8645S/LT8646S package has the same footprint as a standard 6mm × 4mm QFN Package.

**Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These

models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your

local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for

these models.