Data Sheet

LT7200S

analog.com

Rev 0

4 of 35

(Specifications are at TA = 25°C. VIN = 12V, unless otherwise noted)

PARAMETER

SYMBOL

CONDITIONS/COMMENTS

MIN

TYP

MAX

UNITS

INTVCC Undervoltage

Lockout Threshold

VUVLO

INTVCC Falling

2.2

2.4

2.6

V

INTVCCHysteresis (Rising)

0.21

RUN Threshold

VRUN

RUN Rising

1.16

1.2

1.24

V

RUN Hysteresis (Falling)

100

mV

PGOOD Pull-Down

Resistance

RPGOOD

1mA Load

5

10

Ω

Output Overvoltage

PGOOD Upper Threshold

OV

VFB Rising

4.5

6.5

8.5

%

VFB Hysteresis

2

Output Undervoltage

PGOOD Lower Threshold

UV

VFB Falling

-9

-7

-5

%

VFB Hysteresis

2

PGOOD Leakage

IPGOOD

VFB= 0.5V

2

µA

TRACK Pull-Up Current

ITRACK

VTRACK= 0V

5

10

µA

Internal Soft-Start Time

tss

0% to 90% Output Rise Time

115

µs

Oscillator Frequency

fosc

RRT = 100kΩ

-40°C ≤ TJ ≤ 150°C

0.9

1

1.1

MHz

Oscillator Frequency

Range

fosc_range

RRT = 249kΩ to 33.2kΩ

0.4

3

MHz

SYNC Capture Range

fSYNC

% of Programmed Frequency

±30

%

MODE/SYNC Threshold

VIH(MODE/SYNC) MODE/SYNC HIGH

1

V

VIL(MODE/SYNC) MODE/SYNC LOW

0.3

MODE/SYNC Current

IMODESYNC

MODE/SYNC = 0V

5

10

µA

PHMODE Threshold

VPHASEMODE

90° (4 Phase)

0.3

V

120° (3 Phase)

1

.

1 The LT7200S is tested under pulsed load conditions such that TJ ≈ TA. Specifications over the –40°C to 125°C

operating junction temperature range are assured by design, characterization, and correlation with statistical

process controls. The LT7200S is guaranteed over the full –40°C to 125°C operating junction temperature range.

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. The junction temperature (TJ, in °C) is calculated from the ambient temperature (TA, in °C)

and power dissipation (PD, in watts) according to the formula:

TJ = TA + (PD • θJA), where θJA (in °C/W) is the package thermal impedance.

2 The quiescent current in Discontinuous Mode does not include switching loss of the power FETs.

3 VFB is measured in a feedback loop that servos VITH to a specified voltage.

4 There is additional switch current due to internal resistor to ground.