LM3502 datasheet(5/18 Pages) NSC

5 / 18 page

Preliminary Electrical Characteristics (Notes 6, 7) Limits in standard typeface are for T

J = 25˚C.

Limits in bold typeface apply over the full operating junction temperature range (−40˚C

≤ T

≤ +125˚C). Unless otherwise

specified, V

IN = 2.5V. (Continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VOUT1(ON)

OUT1 Pin Bias

Current (Note 3)

OUT1 = 14V, Cntrl = 1.5V (16)

OUT1 = 23V, Cntrl = 1.5V (25)

OUT1 = 32V, Cntrl = 1.5V (35)

OUT1 = 42V, Cntrl = 1.5V (44)

100

140

µA

VOUT2

OUT2 Pin Leakage

Current (Note 3)

Fb = 0V, Cntrl = 0V, V

OUT2 = 42V

0.1

µA

UVP

Under-Voltage

Protection

On Threshold

Off Threshold

2.2

2.4

2.3

2.5

OVP

Over-Voltage

Protection (Note 5)

On Threshold (16)

Off Threshold (16)

On Threshold (25)

Off Threshold (25)

On Threshold (35)

Off Threshold (35)

On Threshold (44)

Off Threshold (44)

14.5

14.0

22.5

21.5

32.0

31.0

40.5

39.0

15.5

16.5

16.0

25.5

24.5

35.0

34.0

43.5

42.0

En1

PMOS FET Switch

Enabling Threshold

(Figure 2: P1)

Off Threshold (Display Lighting)

On Threshold (Display Lighting)

1.4

0.8

0.3

En2

NMOS FET Switch

Enabling Threshold

(Figure 2: N2)

Off Threshold (Display Lighting)

On Threshold (Display Lighting)

1.4

0.8

0.3

Cntrl

Device Enabling

Threshold

Off Threshold

OnThreshold

1.4

0.8

0.3

SHDW

Shutdown Delay Time

En1

En1 Pin Input Bias

Current

En1 = 2.5V

En1=0V

0.1

µA

En2

En2 Pin Input Bias

Current

En2 = 2.5V

En2=0V

0.1

µA

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical characteristic specifications do not apply when

operating the device outside of its rated operating conditions.

Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin.

Note 3: Current flows into the pin.

Note 4: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA,

and the ambient temperature, TA. See Thermal Properties for the thermal resistance. The maximum allowable power dissipation at any ambient temperature is

calculated using: PD(MAX) = (TJ(MAX) – TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature. For more information

on this topic, please refer to Application Note 1187: Leadless Leadframe Package (LLP) and Application Note 1112 (AN1112) for microSMD chip scale package.

Note 5: The on threshold indicates that the LM3502 is no longer switching or regulating LED current, while the off threshold indicates normal operation.

Note 6: All voltages are with respect to the potential at the GND pin.

Note 7: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.

Note 8: Current flows out of the pin.

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