LM2660/LM2661
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)
6V
LV
(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.
M
Power Dissipation
(T
A
= 25˚C) (Note 3)
T
J
Max (Note 3)
θ
JA
(Note 3)
Operating Junction
Temperature
Range
Storage Temperature Range
Lead Temperature
(Soldering, 10 seconds)
ESD Rating
Package
MM
500 mW
150˚C
250˚C/W
735 mW
150˚C
170˚C/W
−40˚C to +85˚C
−65˚C to +150˚C
300˚C
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
= C
2
= 150 µF. (Note 4)
Symbol
V+
Parameter
Supply Voltage
R
L
= 1k
Condition
Inverter, LV = Open
Inverter, LV = GND
Doubler, LV = OUT
FC = Open (LM2660)
FC = V+ (LM2660) or
SD = Ground (LM2661)
Min
3.5
1.5
2.5
0.12
1
0.5
Shutdown Mode
Normal Operation
T
A
≤
+85˚C, OUT
≤
−4V
T
A
>
+85˚C, OUT
≤
−3.8V
I
L
= 100 mA
T
A
≤
+85˚C
OSC = Open
OSC = Open
FC = Open
FC = V+
R
L
(1k) between V
+
and OUT
R
L
(500) between GND and OUT
I
L
= 100 mA to GND
V
OEFF
Voltage Conversion Efficiency
No Load
96
92
99
T
A
>
+85˚C
FC = Open
FC = V+
FC = Open
FC = V+
I
OSC
P
EFF
OSC Input Current
Power Efficiency
100
100
6.5
5
40
2.5
20
10
80
5
40
10
12
2.0
(Note 5)
0.3
Typ
Max
5.5
5.5
5.5
0.5
3
2
mA
V
Units
I
Q
Supply Current
No Load
LV = Open
I
SD
V
SD
I
L
R
OUT
f
OSC
f
SW
Shutdown Supply Current
(LM2661)
Shutdown Pin Input Voltage
(LM2661)
Output Current
Output Resistance (Note 6)
Oscillator Frequency (Note 7)
Switching Frequency (Note 8)
µA
V
mA
Ω
kHz
kHz
µA
±
2
±
16
98
96
88
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 P
DMax
= (T
JMax
− T
A
)/θ
JA
, where T
JMax
is the maximum junction temperature, T
A
is the
ambient temperature, and
θ
JA
is the junction-to-ambient thermal resistance of the specified package.
Note 4:
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 volt-
age and efficiency.
Note 5:
In doubling mode, when V
out
>
5V, minimum input high for shutdown equals V
out
− 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, f
OSC
= 2f
SW
.
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