LT3752-1 datasheet(4/48 Pages) LINER

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LT8311

8311f

For more information www.linear.com/LT8311

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply

VIN Operating Range

3.7

VIN UVLO

VIN Rising

Hysteresis

3.6

100

3.7

150

Quiescent Current

Not Switching

4.5

5.5

Error Amplifier

Feedback Reference Voltage

VIN = 12V

1.209

1.227

1.245

Feedback Voltage Line Regulation

3.7V ≤ VIN ≤ 30V, % of FB Ref Voltage

0.015

0.1

Feedback Voltage Load Regulation

1.3V ≤ COMP ≤ 1.8V, % of FB Ref Voltage

0.05

0.1

Feedback Pin Bias Current

Current Out of FB pin

120

200

Error Amplifier Transconductance

1.3V ≤ COMP ≤ 1.8V

370

µmhos

Error Amplifier Voltage Gain

1.3V ≤ COMP ≤ 1.8V

Error Amplifier Output Swing High

FB = 1V

1.9

2.3

2.8

Error Amplifier Output Swing Low

FB = 1.5V

0.75

1.25

Power Good

Power NOT Good (Outside This Window) % Relative to FB Ref Voltage

±4

±10

±16

Power Good (Inside This Window)

% Relative to FB Ref Voltage

±7

Power Good Indicator Wait Time

Minimum Time That FB Must Stay within Power Good Window

Before PGOOD Pin Goes Low

175

µs

Power Good Leakage

PGOOD = 30V

±1

µA

Power Good Output Low Voltage

Current into PGOOD Pin = 1mA

0.2

0.3

Soft-Start (SS)

SS Wake-Up Slew Current

Current Exists Upon Part Wake Up, Shuts Off After SS Wake Up

Offset Voltage Is Satisfied (Note 6)

SS Wake-Up Offset Voltage

VFB – VSS, Upon Part Wake Up SS Is Slewed Up to an Offset

Voltage Below FB by SS Wake-Up Slew Current

SS Charge Current

SS = 0V, FB = 0.6V (Note 9)

µA

SS Pull-Down Amplifier Offset Voltage

VSS – VFB, Pull-Down Amplifier Prevents SS from Rising Beyond

This Offset Voltage Above FB When the FB Pin Voltage Is Below

50% of the FB Reference Voltage

100

SS Pull-Down Amplifier Maximum

Sink Current

SS = 1.5V, FB = 0.6V (Note 7)

SS High Clamp Voltage

1.8

Opto Driver

COMP Buffer Input Offset Voltage

1.3V ≤ COMP (Note 5)

0.9

Opto-Driver Reference Voltage

(Note 5)

Opto-Driver DC Gain

(Note 5)

–7

V/V

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, VINTVCC = 8V, PMODE = 5V, CCG = CFG = 100pF, unless

otherwise noted. (Note 2)

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