LTC3853_15 datasheet(3/36 Pages) LINER

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LTC3853

3853fc

For more information www.linear.com/LTC3853

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at TA = 25°C (Note 3), VIN = 15V, VRUN1,2,3 = 5V, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Control Loops

Output Voltage Range

Channels 1, 2

0.8

5.5

Channel 3

0.8

13.5

VFB1,2,3

Regulated Feedback Voltage

ITH1,2,3 Voltage = 1.2V, –55°C to 150°C (Note 4)

ITH1,2,3 Voltage = 1.2V, –40°C to 125°C (Note 4)

ITH1,2,3 Voltage = 1.2V, 0°C to 85°C (Note 4)

0.790

0.792

0.794

0.800

0.810

0.808

0.806

Feedback Current

(Note 4)

–10

–50

Reference Voltage Line Regulation

VIN = 6V to 24V (Note 4)

0.002

0.02

%/V

Output Voltage Load Regulation

(Note 4)

Measured in Servo Loop;

DITH Voltage = 1.2V to 0.7V

Measured in Servo Loop;

DITH Voltage = 1.2V to 1.6V

0.01

–0.01

0.1

–0.1

Transconductance Amplifier gm

ITH1,2,3 = 1.2V, Sink/Source 5µA (Note 4)

2.2

mmho

Input DC Supply Current

Normal Mode

Shutdown

(Note 5)

VIN = 15V

VRUN1,2,3 = 0V

4.1

µA

UVLO

Undervoltage Lockout on INTVCC

VINTVCC Ramping Down

3.35

UVLO Hysteresis

0.5

Feedback Overvoltage Lockout

Measured at VFB1,2,3 (H-Grade, MP-Grade)

Measured at VFB1,2,3

0.84

0.86

0.89

0.88

ISENSE

Sense Pin Current

VSENSE = 3.3V

±1

±2

µA

Soft-Start Charge Current

VTK/SS1,2,3 = 0V

0.9

1.3

1.7

µA

VRUN1,2,3

RUN Pin ON Threshold

VRUN1, VRUN2, VRUN3 Rising

1.1

1.2

1.35

RUN Pin Hysteresis

Maximum Current Sense Threshold

ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = 0V

ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = 0V (H-, MP-

Grade)

ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = Float

ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = Float (H-, MP-

Grade)

ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = INTVCC

ITH1,2,3 = 1.85V, VSENSE1,2,3 = 3.3V, ILIM = INTVCC (H-,

MP-Grade)

Maximum Duty Factor

In Dropout

TG Driver Pull-Up On-Resistance

TG High

2.6

TG Driver Pull-Down On-Resistance

TG Low

1.5

BG Driver Pull-Up On-Resistance

BG High

2.4

BG Driver Pull-Down On-Resistance

BG Low

1.1

TG Transition Time:

Rise Time

Fall Time

(Note 6)

CLOAD = 3300pF

BG Transition Time:

Rise Time

Fall Time

(Note 6)

CLOAD = 3300pF

Top Gate Off to Bottom Gate On Delay

Synchronous Switch-On Delay Time

(Note 6)

CLOAD = 3300pF Each Driver

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