Rev. C 07/16

6

LYT7503-7504

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Absolute Maximum Ratings(1,3)

DRAIN Pin Voltage:

LYT750x ........................... -0.3 V to 725 V

DRAIN Pin Peak Current: LYT7503 ...........................1.05 A (1.3 A)(1)

LYT7504 .............................2.1 A (2.6 A)(1)

BYPASS Pin Voltage ...................................................-0.3 V to 6.0 V

MULTIFUNCTION, FEEDBACK Pin Voltage................ -0.45 V to 7.0 V(2)

Lead Temperature ................................................................ 260 °C

Storage Temperature ...................................................-65 to 150 °C

Operating Junction Temperature................................ -40 to 150 °C(4)

Notes:

1. The higher peak Drain current (in parentheses) is allowed while the

Drain-Source voltage is simultaneously less than 400 V for the

integrated MOSFET.

2. If the SOURCE pin is open circuit, -0.7 V between FEEDBACK pin

and SOURCE pin is observed with no degradation in performance.

3. The absolute maximum ratings specified may be applied one at a

time without causing permanent damage to the product. Exposure

to absolute maximum ratings for extended periods of time may

affect product reliability.

4. Normally limited by internal circuitry.

Parameter

Symbol

Conditions

SOURCE = 0 V

T

J = -40 °C to 125 °C

(Unless Otherwise Specified)

Min

Typ

Max

Units

Control Functions

Minimum Switching

Frequency

f

MIN

18

20

22

kHz

Maximum Switch

ON-Time

T

ON(MAX)

10

µs

Minimum Switch

ON-Time

T

ON(MIN)

1.012

1.1

1.25

µs

FEEDBACK Pin

Reference Voltage

V

FB(REF)

T

J = 25 °C

See Note C

-285

-279

-273

mV

Dead Zone Detect

Threshold

V

TH(DZ)

0.3 ×

V

FB(REF)

V

Maximum Constant

Current Zone

T

CC(MAX)

6

ms

Forced Minimum

Constant Current Zone

T

CC(MIN)

1.2

ms

BYPASS Pin

Supply Current

I

SBY

Standby (MOSFET not switching)

180

µA

I

DSS

MOSFET Switching

LYT7503

785

µA

LYT7504

850

BYPASS Pin

Charge Current

I

CH1

V

BP = 0.0 V, VDS ≥ 36 V

-10

-4.5

mA

I

CH2

V

BP = 5.0 V, VDS ≥ 36 V

-6

-2

mA

BYPASS Pin Voltage

V

BP

5.075

5.22

5.35

V

BYPASS Pin

Shunt Voltage

V

BP(SHUNT)

5.2

5.39

5.55

V

BYPASS Pin Power-Up

Reset Threshold Voltage

V

BP(RESET)

4.35

4.5

4.65

V

Thermal Resistance

Thermal Resistance: SO-8 Package:

(q

JA)................................100 °C/W

(2)

, 80 °C/W(3)

(q

JC)

(1)

................................................ 30 °C/W

Notes:

1. Measured on the SOURCE pin close to plastic interface.

2. Soldered to 0.36 sq. inch (232 mm2) 2 oz. (610 g/m2) copper clad

pcb, with no external heat sink attached.

3. Soldered to 1 sq. in. (645 mm2), 2 oz, (610 g/m2) copper clad pcb.