LT7101 datasheet(3/38 Pages) AD

3 / 38 page

LT7101

Rev. 0

For more information www.analog.com

PIN CONFIGURATION

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Main Regulator and Voltage Loop

VIN

Operating Input Voltage Range

4.4

105

VIN(UVLO)

VIN Undervoltage Lockout

VIN Rising

VIN Falling

4.36

4.11

4.50

4.25

4.64

4.39

VOUT

Operating Output Voltage Range

(Note 9)

1.0

105

VIN Input DC Supply Current

(Note 8)

Pulse-Skipping Mode

VFB = 1.04V, EXTVCC = 3.3V

VFB = 1.04V, EXTVCC = 0V

200

4.4

µA

Sleep Mode

VFB = 1.04V, EXTVCC = 3.3V

VFB = 1.04V, EXTVCC = 0V

1.0

9.0

µA

Shutdown

RUN = 0V

0.7

1.5

µA

VIN Input Current In Regulation

Figure 14 Circuit, VIN = 48V, IOUT = 500μA

Figure 16 Circuit, VIN = 48V, IOUT = 0μA

µA

VFB

Regulated Feedback Voltage

(Note 5)

ITH Voltage = 0.5V to 1.2V, VIN = 4.5V to 105V

VPRG1 = VPRG2 = FLOAT

VPRG1 = VPRG2 = INTVCC

VPRG1 = FLOAT, VPRG2 = INTVCC

VPRG1 = VPRG2 = SGND

VPRG1 = SGND, VPRG2 = FLOAT

VPRG1 = SGND, VPRG2 = INTVCC

VPRG1 = FLOAT, VPRG2 = SGND

VPRG1 = INTVCC, VPRG2 = FLOAT

VPRG1 = INTVCC, VPRG2 = SGND

0.990

1.182

1.770

2.455

3.234

3.528

4.900

11.75

14.70

1.000

1.200

1.800

2.500

3.300

3.600

5.000

12.00

15.00

1.010

1.218

1.827

2.537

3.350

3.654

5.075

12.24

15.30

Feedback Input Bias Current

VPRG1 = VPRG2 = FLOAT

VPRG1 or VPRG2 Tied to SGND or INTVCC

±2

1.25

±10

1.6

µA

Error Amplifier gm

ITH = 1V, Sink/Source = 5µA (Note 5)

1.52

tON,MIN

Minimum Controllable ON-Time

(Note 7)

RDS(ON)TOP Top Switch On-Resistance

580

mΩ

RDS(ON)BOT Bottom Switch On-Resistance

300

mΩ

Current Control and Monitoring

ILIM(AVG)

Average Output Current Limit

(Note 6)

ICTRL = FLOAT

ICTRL = 0.58V

1.00

0.16

1.11

0.22

1.21

0.28

IPK

Top Switch Peak Current Limit

ICTRL = FLOAT

ICTRL = 0.58V

1.43

0.63

1.64

0.75

1.85

0.87

VIMON

Current Monitor Output Voltage

(Note 6)

ISW = 1.0A

ISW = 0.25A

1.13

0.552

1.21

0.603

1.29

0.654

ICTRL Pin Pull-Up Current

VICTRL = 0.5V

µA

Start-Up and Shutdown

ISS

Soft-Start Charge Current

SS = 0V

µA

tSS(INT)

Internal Soft-Start Ramp Time

SS = FLOAT

1.2

VFB(OV)

Feedback Overvoltage Protection

Relative to Regulated VFB

VRUN(ON)

RUN Pin ON Threshold

VRUN Rising

VRUN Falling

1.16

1.06

1.21

1.11

1.26

1.16

RUN Pin Hysteresis

100

RUN Pin Leakage Current

RUN = 1.5V

–10

The l denotes the specifications which apply over the specified operating

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

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