Datasheet

LM2766
www.ti.com SNVS071B –MARCH 2000–REVISED MAY 2013
Electrical Characteristics
Limits in standard typeface are for T
J
= 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: V+ = 5V, C
1
= C
2
= 1.0 μF.
(1)
Symbol Parameter Condition Min Typ Max Units
V+ Supply Voltage 1.8 5.5 V
I
Q
Supply Current No Load 350 950 µA
I
SD
Shutdown Supply Current 0.1 0.5
µA
T
A
= 85°C 0.2
V
SD
Shutdown Pin Input Voltage Shutdown Mode 0.6
V
Normal Operation 2.0
I
L
Output Current 2.5V ≤ V
IN
≤ 5.5V 20
mA
1.8V ≤ V
IN
< 2.5V 10
R
OUT
Output Resistance
(2)
I
L
= 20 mA 20 55 Ω
f
OSC
Oscillator Frequency See
(3)
220 400 700 kHz
f
SW
Switching Frequency See
(3)
110 200 350 kHz
P
EFF
Power Efficiency I
L
= 20 mA to GND 94 %
V
OEFF
Voltage Conversion Efficiency No Load 99.96 %
(1) In the test circuit, capacitors C
1
and C
2
are 1.0 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, f
OSC
= 2f
SW
.
Test Circuit
Figure 4. LM2766 Test Circuit
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