LTC3889 datasheet(7/118 Pages) AD

7 / 118 page

LTC3888/LTC3888-1/

LTC3888-2

Rev. B

For more information www.analog.com

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN Supply

VIN

VIN Operating Range

4.5

26.5

IC Operating Current

RUN0,1 = 0V

RUN0,1 = 3.3V, CPWMn = 0pF

INTVCC Linear Regulator Supply

INTVCC

INTVCC Output Voltage

VIN ≥ 6V (Note 4)

5.2

EXTVCC

INTVCC Input Voltage Range

VIN = INTVCC (Note 4)

4.5

5.5

V5UVLO

PWM Undervoltage

Lockout Threshold

VDD33 Rising

Hysteresis

300

4.45

VDD33 Linear Regulator Supply

VDD33

VDD33 Output Voltage

INTVCC ≥ 4.5V (Note 5)

3.15

3.3

3.45

V3UVLO

PMBus Undervoltage

Lockout Threshold

VDD33 Rising

Hysteresis

275

3.10

VDD25 Linear Regulator

VDD25

VDD25 Output Voltage

(Note 7)

2.5

PWM Control Loops

VFB (LTC3888-1)

Regulated Feedback Voltage

VOUT_SCALE_LOOP Not Programmed

400

IFB (LTC3888-1)

VFB Input Current

VFB = 0.4V

–100

100

VOUT

Accuracy without Servo (Note 10)

Accuracy with Servo

(Notes 9, 10, See Test Circuit)

Servo Resolution

1V ≤ VOUT ≤ 3.45V

0.3V ≤ VOUT ≤ 3.45V

–1.5

–0.5

±0.2

1.5

0.5

Bits

RVSENSE (LTC3888)

VSENSE Input Resistance

19.5

kΩ

RVSENSE

(LTC3888-1/3888-2)

43.3

kΩ

VLINEREG

Line Regulation

6V ≤ VIN ≤ 24V (Note 10)

–0.02

0.02

%/V

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 8). VIN = 12V, VSENSEn+ = 1V, VSENSEn– = GND = 0V,

fSYNC = 500kHz (externally driven) unless otherwise specified.

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC3888IUHG#PBF

LTC3888IUHG#TRPBF

3888