Datasheet

LM2660
www.ti.com SNVS135D –SEPTEMBER 1999–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, FC = Open, C
1
= C
2
= 150 μF.
(1)
Symbol Parameter Condition Min Typ Max Units
Inverter, LV = Open 3.5 5.5
V+ Supply Voltage R
L
= 1k Inverter, LV = GND 1.5 5.5 V
Doubler, LV = OUT 2.5 5.5
No Load FC = Open 0.12 0.5
I
Q
Supply Current mA
LV = Open FC = V+ 1 3
T
A
≤ +85°C, OUT ≤ −4V 100
I
L
Output Current mA
T
A
> +85°C, OUT ≤ −3.8V 100
T
A
≤ +85°C 6.5 10
R
OUT
Output Resistance
(2)
I
L
= 100 mA Ω
T
A
> +85°C 12
FC = Open 5 10
f
OSC
Oscillator Frequency OSC = Open kHz
FC = V+ 40 80
FC = Open 2.5 5
f
SW
Switching Frequency
(3)
OSC = Open kHz
FC = V+ 20 40
FC = Open ±2
I
OSC
OSC Input Current µA
FC = V+ ±16
R
L
(1k) between V
+
and OUT 96 98
P
EFF
Power Efficiency R
L
(500) between GND and OUT 92 96 %
I
L
= 100 mA to GND 88
V
OEFF
Voltage Conversion Efficiency No Load 99 99.96 %
(1) In the test circuit, capacitors C
1
and C
2
are 0.2Ω 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.
(3) The output switches operate at one half of the oscillator frequency, f
OSC
= 2f
SW
.
Test Circuits
Figure 1. LM2660 Test Circuit
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