LM2660 datasheet(2/12 Pages) NSC

2 / 12 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)

(OUT − 0.3V) to (GND + 3V)

FC, OSC

The least negative of (OUT − 0.3V)

or (V+ − 6V) to (V+ + 0.3V)

V+ and OUT Continuous Output Current

120 mA

Output Short-Circuit Duration to GND (Note 2)

1 sec.

Package

MMM

Power Dissipation

A = 25˚C) (Note 3)

735 mW

500 mW

J Max (Note 3)

150˚C

JA (Note 3)

170˚C/W

250˚C/W

Operating Junction

Temperature

Range

−40˚C to +85˚C

Storage Temperature Range

−65˚C to +150˚C

Lead Temperature

300˚C

(Soldering, 10 seconds)

ESD Rating

2 kV

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, FC = Open, C

1 = C2 = 150 µF. (Note 4)

Symbol

Parameter

Condition

Min

Typ

Max

Units

V+

Supply Voltage

L = 1k

Inverter, LV = Open

3.5

5.5

Inverter, LV = GND

1.5

5.5

Doubler, LV = OUT

2.5

5.5

Supply Current

No Load

FC = Open (LM2660)

0.12

0.5

LV = Open

FC = V+ (LM2660) or

SD = Ground (LM2661)

Shutdown Supply Current

0.5

µA

(LM2661)

Shutdown Pin Input Voltage

Shutdown Mode

2.0

(Note 5)

(LM2661)

Normal Operation

0.3

Output Current

A ≤ +85˚C, OUT ≤ −4V

100

A > +85˚C, OUT ≤ −3.8V

100

OUT

Output Resistance (Note 6)

L = 100 mA

A ≤ +85˚C

6.5

Ω

A > +85˚C

OSC

Oscillator Frequency (Note 7)

OSC = Open

FC = Open

kHz

FC = V+

Switching Frequency (Note 8)

OSC = Open

FC = Open

2.5

kHz

FC = V+

OSC

OSC Input Current

FC = Open

±2

µA

FC = V+

±16

EFF

Power Efficiency

L (1k) between V

+ and OUT

L (500) between GND and OUT

L = 100 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 0.2Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output volt-

age and efficiency.

Note 5: In doubling mode, when Vout > 5V, minimum input high for shutdown equals Vout −3V.

Note 6: Specified output resistance includes internal switch resistance and capacitor ESR.

Note 7: For LM2661, the oscillator frequency is 80 kHz.

Note 8: The output switches operate at one half of the oscillator frequency, fOSC = 2fSW.

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