LM2794 datasheet(3/21 Pages) TI1

Il numero della parte	LM2794

Spiegazioni elettronici	Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control

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Produttore elettronici	TI1 [Texas Instruments]

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LM2794, LM2795

www.ti.com

SNVS168K – MAY 2004 – REVISED MAY 2004

Absolute Maximum Ratings

(1)

VIN

−0.5 to 6.2V max

SD

−0.5 to (VIN+0.3V) w/ 6.2V max

BRGT

−0.5 to (VIN+0.3V) w/ 6.2V max

Continuous Power Dissipation (2)

Internally Limited

TJMAX

(2)

135°C

θJA

(2) (3)

125°C/W

Storge Temperature

−65°C to +150°C

Lead Temp. (Soldering, 5 sec.)

260°C

ESD Rating (4)

Human Body Model

2kV

Machine Model

200V

(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.

(2)

Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ=150°C (typ.) and

disengages at TJ=140°C (typ.). D1, D2, D3 and D4 may be shorted to GND without damage. POUT may be shorted to GND for 1sec

without damage.

(3)

The value of

θJA is based on a two layer evaluation board with a dimension of 2in. x1.5in.

(4)

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.

Operating Conditions

Input Voltage (VIN)

2.7V to 5.5V

Ambient Temperature (TA)

−30°C to +85°C

Junction Temperature (TJ)

−30°C to +100°C

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