LM2765 datasheet(3/14 Pages) TI

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LM2765

www.ti.com

SNVS070C – MARCH 2000 – REVISED MAY 2013

Electrical Characteristics

Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range.

Unless otherwise specified: V+ = 5V, C1 = C2 = 3.3 μF.

(1)

Symbol

Parameter

Condition

Min

Typ

Max

Units

V+

Supply Voltage

1.8

5.5

Supply Current

No Load

130

450

µA

ISD

Shutdown Supply Current

0.1

0.5

µA

TA = 85°C

0.2

VSD

Shutdown Pin Input Voltage

Shutdown Mode

2.0

Normal Operation

0.6

Output Current

2.5V

≤ VIN ≤ 5.5V

1.8V

≤ VIN < 2.5V

ROUT

Output Resistance(2)

IL = 20 mA

fOSC

Oscillator Frequency

See(3)

100

200

kHz

fSW

Switching Frequency

See(3)

100

kHz

PEFF

Power Efficiency

IL = 20 mA to GND

VOEFF

Voltage Conversion Efficiency

No Load

99.96

(1)

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.

(2)

Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information for

positive voltage doubler.

(3)

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

Test Circuit

Figure 3. LM2765 Test Circuit

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