LT7101 datasheet(4/38 Pages) AD

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LT7101

Rev. 0

For more information www.analog.com

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOV(R)

OVLO Pin Rising Threshold

VOVLO Rising

1.16

1.21

1.26

OVLO Pin Hysteresis

OVLO Pin Leakage Current

OVLO = 1.5V

–10

Bias Regulators and Housekeeping

INTVCC Undervoltage Lockout

INTVCC Rising

INTVCC Falling

3.00

2.80

VEXTVCC

EXTVCC Switchover Voltage

EXTVCC Rising

EXTVCC Falling

3.03

2.95

3.10

3.00

3.17

3.07

Regulated INTVCC Voltage from VIN

3.37

3.50

3.63

Regulated INTVCC Voltage from EXTVCC

3.37

3.50

3.63

Oscillator and Phase-Locked Loop

Programmable Frequency Accuracy

RFREQ = 12.5k (200kHz) to 57.5k (2MHz)

PLLIN/MODE = 0V

–15

fLOW

Low Preset Frequency

VFREQ = 0V;

PLLIN/MODE = 0V

270

300

330

kHz

fHIGH

High Preset Frequency

VFREQ = INTVCC;

PLLIN/MODE = 0V

0.9

1.0

1.1

MHz

Synchronizable Frequency

PLLIN/MODE = External Clock

200

2000

kHz

PLLIN/MODE Input High Level for Clocking

PLLIN/MODE = External Clock

2.0

PLLIN/MODE Input Low Level for Clocking

PLLIN/MODE = External Clock

0.8

PGOOD Output

PGOOD Voltage Low

IPGOOD = 1mA

0.3

0.5

PGOOD Leakage Current

VPGOOD = 12V

–1

µA

PGOOD Trip Level

VFB with Respect to Set Regulated Voltage

VFB Ramping Positive

Hysteresis

2.5

VFB Ramping Negative

–13

–10

–7

Hysteresis

2.5

TPG

Delay for Reporting a Fault

µs

ELECTRICAL CHARACTERISTICS The

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.

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT7101E is guaranteed to meet specifications from 0°C to

85°C with specifications over the –40°C to 125°C operating junction

temperature range assured by design, characterization and correlation with

statistical process controls. The LT7101I is guaranteed over the –40°C to

125°C operating junction temperature range, the LT7101H is guaranteed

over the –40°C to 150°C operating junction temperature range, and the

LT7101MP is tested and guaranteed over the –55°C to 150°C operating

junction temperature range. High junction temperatures degrade operating

lifetimes; operating lifetime is derated for junction temperatures greater

than 125°C. Note that the maximum ambient temperature consistent with

these specifications is determined by specific operating conditions in

conjunction with board layout, the rated package thermal impedance and

other environmental factors.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • qJA°C/W)

Note 4: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. The maximum

rated junction temperature will be exceeded when this protection is active.

Continuous operation above the specified absolute maximum operating

junction temperature may impair device reliability or permanently damage

the device. The overtemperature protection level is not production tested.

Note 5: The LT7101 is tested in a feedback loop that servos VFB to a

voltage near the internal reference voltage to obtain the specified ITH

voltage.

Note 6: The Average Output Current Limit, the Top Switch Peak Current

Limit and the Current Monitor Output Voltage are measured in a test circuit

that simulates operation in a typical application.

Note 7: The minimum controllable on-time is measured in a test mode.

(See Minimum ON-Time Considerations in the Applications Information

section.)

Note 8: Dynamic supply current is higher due to the internal gate charge

being delivered at the switching frequency.

Note 9: See Operating at VOUT > 6V in Applications Information section for

details about additional design constraints that may apply.

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