LM2686 datasheet(3/8 Pages) NSC

3 / 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

IN to GND)

6.8V

SD, CE

(GND − 0.3V) to

In + 0.3V)

05 Continuous Output Current

80mA

05 Short-Circuit Duration to GND

(Note 2)

Indefinite

Continuous Power Dissipation (T

= 25˚C) (Note 3)

600mW

JMAX (Note 3)

150˚C

JA (Note 3)

140˚C/W

Operating Ambient Temp. Range

−40˚C to 85˚C

Operating Junction Temperature

Range

−40˚C to 125˚C

Storage Temp. Range

−65˚C to 150˚C

Lead Temp. (Soldering, 10 sec.)

300˚C

ESD Rating (Note 4)

2kV

Electrical Characteristics

Limits with standard typeface apply for T

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

otherwise specified V

IN = 3.6V, C1 = C3 = 2.2µF. C2 = 4.7µF. (Note 5)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Supply Voltage

2.85

6.5

Supply Current

No Load

450

950

µA

Shutdown Supply Current

IN = 6.5V

µA

Shutdown Pin Input Voltage for

CE, SD

Logic Input High @ 6.5V

2.4

Logic Input Low @ 6.5V

0.8

L (+5V)

Output Current at V

2.85V < V

IN < 6.5V

Switch Frequency

130

180

kHz

EFF

Average Power Efficiency at V

2.85V < V

IN < 6.5V

L = 25mA to GND

Output Regulation

1mA < I

L < 50mA, VIN = 6.5V

(Note 6)

4.848

5.05

5.252

1mA < I

L < 50mA, VIN = 6.5V

(Note 6)

4.797

5.05

5.303

LINE

Line Regulation

2.85V < V

IN < 3.6V

0.25

%/V

3.6V < V

IN < 6.5V

0.05

LOAD

Load Regulation

1mA < I

L < 50mA, VIN = 6.5V

0.3

1.0

Series Switch Resistance from

05 to VPSW

IN > 2.85V

5.0

Ω

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-

tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: V05 may be shorted to GND without damage. For temperature above 85˚C, V05 must not be shorted to GND 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, TAis the

ambient temperature and

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

Note 4: The human body model is a 100pF capacitor discharged through a 1.5k

Ω resistor into each pin.

Note 5: In the typical operating circuit, capacitors C1 and C3 are 2.2µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance,

reduce output voltage and efficiency.

Note 6: The 50mA maximum current assumes no current is drawn from VDBL pin. See Voltage Doubler section in the Detailed Device Description.

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