LTC3835 datasheet(3/40 Pages) LINER

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LTC3890-3

38903f

For more information www.linear.com/3890-3

elecTrical characTerisTics The

denotes the specifications which apply over the full operating junction

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

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

ITH1,2 Voltage = 1.2V (Note 4)

–40°C to 85°C, All Grades

LTC3890E-3, LTC3890I-3,

LTC3890H-3, LTC3890MP-3

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

VIN = 4.5V to 60V (Note 4)

0.002

0.02

%/V

VLOADREG

Output Voltage Load Regulation

(Note 4)

Measured in Servo Loop,

∆ITH Voltage = 1.2V to 0.7V

0.01

0.1

(Note 4)

Measured in Servo Loop,

∆ITH Voltage = 1.2V to 2V

–0.01

–0.1

gm1,2

Transconductance Amplifier gm

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

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

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 or

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

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

DFMAX

Maximum Duty Factor

In Dropout

ITRACK/SS1,2 Soft-Start Charge Current

VTRACK1,2 = 0V

0.7

1.0

1.4

µA

VRUN1 On

VRUN2 On

RUN1 Pin On Threshold

RUN2 Pin On Threshold

VRUN1 Rising

VRUN2 Rising

1.15

1.20

1.21

1.25

1.27

1.30

VRUN1,2 Hyst RUN Pin Hysteresis

VSENSE(MAX) Maximum Current Sense Threshold

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

Gate Driver

TG1,2 Pull-Up On-Resistance

TG1,2 Pull-Down On-Resistance

2.5

1.5

BG1,2 Pull-Up On-Resistance

BG1,2 Pull-Down On-Resistance

2.4

1.1

TG1,2 tr

TG1,2 tf

TG Transition Time:

Rise Time

Fall Time

(Note 6)

CLOAD = 3300pF

BG1,2 tr

BG1,2 tf

BG Transition Time:

Rise Time

Fall Time

(Note 6)

CLOAD = 3300pF

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