LTC3891 datasheet(3/40 Pages) LINER

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LTC3890-2

38902f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Input Supply Operating Voltage Range

VOUT

Regulated Output Voltage Range

0.8

VFB1,2

Regulated Feedback Voltage

(Note 4) ITH1,2 Voltage = 1.2V

–40°C to 85°C, All Grades

LTC3890E-2, LTC3890I-2

LTC3890H-2, LTC3890MP-2

0.792

0.788

0.786

0.800

0.808

0.812

IFB1,2

Feedback Current

(Note 4)

±5

±50

VREFLNREG

Reference Voltage Line Regulation

(Note 4) VIN = 4.5V to 60V

0.002

0.02

%/V

VLOADREG

Output Voltage Load Regulation

(Note 4)

Measured in Servo Loop,

ΔITH Voltage = 1.2V to 0.7V

0.01

0.1

(Note 4)

Measured in Servo Loop,

ΔITH Voltage = 1.2V to 2V

–0.01

–0.1

gm1,2

Transconductance Amplifier gm

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

mmho

Input DC Supply Current

(Note 5)

Pulse-Skipping or Forced Continuous

Mode (One Channel On)

RUN1 = 5V and RUN2 = 0V, VFB1 = 0.83V or

RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V

1.3

Pulse-Skipping or Forced Continuous

Mode (Both Channels On)

RUN1,2 = 5V, VFB1,2 = 0.83V (No Load)

Sleep Mode (One Channel On)

RUN1 = 5V and RUN2 = 0V, VFB1 = 0.83V (No Load) or

RUN1 = 0V and RUN2 = 5V, VFB2 = 0.83V (No Load)

μA

Sleep Mode (Both Channels On)

RUN1,2 = 5V, VFB1,2 = 0.83V (No Load)

100

μA

Shutdown

RUN1,2 = 0V

μA

UVLO

Undervoltage Lockout

INTVCC Ramping Up

INTVCC Ramping Down

3.6

3.92

3.80

4.2

4.0

ISENSE+

SENSE+ Pin Current

Each Channel

±1

μA

ISENSE–

SENSE– Pins Current

Each Channel

VSENSE– < INTVCC – 0.5V

VSENSE– > INTVCC + 0.5V

700

±1

μA

Maximum TG1, 2 Duty Factor

In Dropout

ITRACK/SS1,2 Soft-Start Charge Current

VTRACK/SS1,2 = 0V

0.7

1.0

1.4

μA

VRUN1

VRUN2

RUN1 Pin On Threshold

RUN2 Pin On Threshold

VRUN1 Rising

VRUN2 Rising

1.15

1.20

1.21

1.25

1.27

1.30

RUN1,2 Pin Hysteresis

VSENSE(MAX) Maximum Current Sense Threshold

VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = 0

VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = INTVCC

VFB1,2 = 0.7V, VSENSE1–,2– = 3.3V, ILIM = FLOAT

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted.

(Note 2)

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