LM2681 datasheet(2/8 Pages) NSC

2 / 8 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.

Supply Voltage (V+ to GND, or GND to OUT)

5.8V

V+ and OUT Continuous Output Current

30 mA

Output Short-Circuit Duration to GND (Note 2)

1 sec.

Continuous Power

Dissipation (T

A = 25˚C)(Note 3)

600 mW

JMax(Note 3)

150˚C

JA (Note 3)

210˚C/W

Operating Junction Temperature

Range

−40˚ to 85˚C

Storage Temperature Range

−65˚C to +150˚C

Lead Temp. (Soldering, 10 seconds)

300˚C

ESD Rating

2kV

Electrical Characteristics

Limits in standard typeface are for T

J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-

less otherwise specified: V+ = 5V, C

1 = C2 = 3.3 µF. (Note 4)

Symbol

Parameter

Condition

Min

Typ

Max

Units

V+

Supply Voltage

2.5

5.5

Supply Current

No Load

550

1000

µA

Output Current

Sum of the R

ds(on)of the four

internal MOSFET switches

L = 20 mA

Ω

OUT

Output Resistance (Note 5)

L = 20 mA

Ω

OSC

Oscillator Frequency

(Note 6)

160

kHz

Switching Frequency

(Note 6)

kHz

EFF

Power Efficiency

L (1.0k) between GND and

OUT

L = 20 mA to GND

OEFF

Voltage Conversion Efficiency

No Load

99.96

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: OUT may be shorted to GND for one second without damage. However, shorting OUT to V+ may damage the device and should be avoided. Also, for tem-

peratures above 85˚C, OUT must not be shorted to GND or V+, or device may be damaged.

Note 3: The maximum allowable power dissipation is calculated by using PDMax = (TJMax −TA)/θJA, where TJMax is the maximum junction temperature, TA is the

ambient temperature, and

θJA is the junction-to-ambient thermal resistance of the specified package.

Note 4: In the test circuit, capacitors C1 and C2 are 3.3 µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output

voltage and efficiency.

Note 5: Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information for positive voltage doubler.

Note 6: The output switches operate at one half of the oscillator frequency, fOSC = 2fSW.

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