LM2792 datasheet(4/10 Pages) NSC

4 / 10 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

−0.3 to 6.0V

BRGT, SD

−0.3 to (V

IN +0.2V)

Power Dissipation (Note 2)

400 mW

JMAX (Note 2)

150˚C

JA (Note 7)

55˚C/W

Storge Temperature

−65˚C to +150˚C

Lead Temp. (Soldering, 5 sec.)

260˚C

ESD Rating

Human Body Model

2KV

Machine Model

200V

Operating Conditions

Input Voltage (V

IN)

3.0V to 5.8V

BRGT

0 to 3.0V

Ambient Temperature (T

−30˚C to +85˚C

34mAOperating Junction

Temperature

−30˚C to 100˚C

Electrical Characteristics

Limits in standard typeface are for T

J = 25˚C and limits in boldface type apply over the full Operating Temperature Range.

Unless otherwise specified, C

1 =CIN =CHOLD = 1 µF, VIN = 3.6V, BRGT pin = 2.75V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Available Current at Output Dx

3.0V

≤ V

≤ 5.8V

≤ 3.6V

SET = 1650

Ω V

BRGT =3V

14.5

16.8

Line Regulation of Dx Output

Current

3.0V

≤ V

≤ 4.4V

≤ 3.6V

SET = 1800

Ω V

BRGT = 2.75V

13.5

17.8

Load Regulation of Dx Output

Current

IN = 3.6V

Dx = 3.0V

Dx = 4.0V

SET = 1800

Ω V

BRGT = 2.75V

16.1

15.4

D-MATCH

Current Matching Between Any

Two Outputs

D1 =VD2 = 3.6V,

BRGT = 2.75V, V

IN = 3.6V,

SET = 1800

Ω

0.3

Quiescent Supply Current

3.0V

≤ V

≤ 4.4V, Active, No

Load Current

1.4

2.7

Shutdown Supply Current

3.0V

≤ V

≤ 5.5V, Shutdown

At 85˚C

0.1

0.3

1µA

SD Input Logic High

3.0V

≤ V

≤ 5.5V, Note5

0.8* V

SD Input Logic Low

3.0V

≤ V

≤ 5.5V, Note5

0.2* V

LEAK-SD

SD Input Leakage Current

≤ V

0.01

µA

BRGT

BRGT Input Resistance

250

Ω

BRGT

Brightness Voltage Range

3.0

SET

SET Pin Output Current

Dx/25

Switching Frequency (Note 4)

3.0V

≤ V

≤ 4.4V

D1 =ID2

≤ 16mA

900

1100

1800

kHz

START

Startup Time (Note 6)

Dx = 90% steady state

µs

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

beyond its rated operating conditions.

Note 2: D1 and D2 may be shorted to GND without damage. POUT may be shorted to GND for 1sec without damage.

Note 3: In the test circuit, all capacitors are 1.0µF, 0.3

Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output

voltage and efficiency.

Note 4: The output switches operate at one half of the oscillator frequency, fOSC =2fSW.

Note 5: The internal thresholds of the Shutdown bar are set at about 40% of VIN

Note 6: This electrical specification is quarantee by design

Note 7: For more information regarding the LLP package, please refer to National Semiconductor Application note AN1187

LM2792 Datasheet(PDF) 4 Page - National Semiconductor (TI)

LM2792 Datasheet(HTML) 4 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10

Datasheet Download

Link URL