Current Sense Input. Connect 1% resistor to ground to set constant current through LED
Variable voltage input controls output current
The LM2794 has an active-low shutdown pin (LOW = shutdown, HIGH = operating). The
LM2795 has an active-high shutdown pin (HIGH = shutdown, LOW = operating) that has a
pull-up to V
IN
.
Positive terminal of C2
Charge pump output
Function
A5
A3
C2+
P
OUT
(*) Note that the pin numbering scheme for the Micro SMD package was revised in April, 2002 to conform to JEDEC standard. Only the pin numbers were revised.
No changes to the physical location of the inputs/outputs were made. For reference purpose, the obsolete numbering had C1+ as pin 1, C1- as pin 2, VIN as pin
3, GND as pin 4, C2- as pin 5, D1-D4 as pin 6,7,8 & 9, Iset as pin 10, BRGT as pin 11, SD as pin 12, C2+ as pin 13, Pout as pin 14
www.national.com
2
LM2794/LM2795
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN
SD
BRGT
Continuous Power Dissipation
(Note 2)
T
JMAX
(Note 2)
−0.5 to 6.2V max
−0.5 to (V
IN
+0.3V) w/
6.2V max
−0.5 to (V
IN
+0.3V) w/
6.2V max
Internally Limited
135˚C
θ
JA
(Notes 2, 3)
Storge Temperature
Lead Temp. (Soldering, 5 sec.)
ESD Rating (Note 4)
Human Body Model
Machine Model
125˚C/W
−65˚C to +150˚C
260˚C
2kV
200V
Operating Conditions
Input Voltage (V
IN
)
Ambient Temperature (T
A
)
Junction Temperature (T
J
)
2.7V to 5.5V
−30˚C to +85˚C
−30˚C to +100˚C
Electrical Characteristics
Limits in standard typeface are for T
J
= 25˚C and limits in
boldface type
apply over the full
Operating Junction Temperature
Range
(−30˚C
≤
T
J
≤
+100˚C). Unless otherwise specified, C1 = C2 = C
IN
= C
HOLD
= 1 µF, V
IN
= 3.6V, BRGT pin = 0V; R
SET
=124Ω ; LM2794:V
SD
= V
IN
(LM2795: V
SD
= 0V).
Symbol
I
DX
Parameter
Available Current at Output Dx
Conditions
3.0V
≤
V
IN
≤
5.5V
V
DX
≤
3.8V
BRGT = 50mV
2.7V
≤
V
IN
≤
3.0V
V
DX
≤
3.6V
BRGT = 0V
V
DX
≤
3.8V
BRGT = 200mV
V
DX
Available Voltage at Output Dx
3.0V
≤
V
IN
≤
5.5V
I
DX
≤
15mA
BRGT = 50mV
3.0V
≤
V
IN
≤
5.5V
V
DX
= 3.6V
3.0V
≤
V
IN
≤
4.4V
V
DX
= 3.6V
I
DX
I
D-MATCH
I
Q
Load Regulation of Dx Output
Current
Current Matching Between Any
Two Outputs
Quiescent Supply Current
V
IN
= 3.6V
3.0V
≤
V
DX
≤
3.8V
V
IN
= 3.6V, V
DX
= 3.6V
3.0V
≤
V
IN
≤
4.2V, Active, No
Load Current
R
SET
= OPEN
3.0V
≤
V
IN
≤
5.5V, Shutdown
V
IN
= 3.6V
Min
15
Typ
16.8
Max
Units
mA
10
mA
20
3.8
mA
V
I
DX
Line Regulation of Dx Output
Current
14.18
14.18
14.18
15.25
15.25
15.25
0.5
5.5
16.78
16.32
16.32
mA
mA
mA
%
8.2
mA
I
SD
I
PULL-SD
V
CP
V
CPH
V
IH
V
IL
I
LEAK-SD
R
BRGT
I
SET
Shutdown Supply Current
Shutdown Pull-Up Current
(LM2795)
Input Charge-Pump Mode To
Pass Mode Threshold
Input Charge-Pump Mode To
Pass Mode Hysteresis
SD Input Logic High (LM2794)
SD Input Logic High (LM2795)
SD Input Logic Low (LM2794)
SD Input Logic Low (LM2795)
SD Input Leakage Current
BRGT Input Resistance
I
SET
Pin Output Current
2.3
1.5
4.7
5
µA
µA
V
mV
V
(Note 5)
3.0V
≤
V
IN
≤
5.5V
3.0V
≤
V
IN
≤
5.5V
0V
≤
V
SD
≤
V
IN
1.0
0.8V
IN
250
0.2
0.2V
IN
100
240
I
DX
/10
V
nA
kΩ
mA
3
www.national.com
LM2794/LM2795
Electrical Characteristics
(Continued)
Limits in standard typeface are for T
J
= 25˚C and limits in
boldface type
apply over the full
Operating Junction Temperature
Range
(−30˚C
≤
T
J
≤
+100˚C). Unless otherwise specified, C1 = C2 = C
IN
= C
HOLD
= 1 µF, V
IN
= 3.6V, BRGT pin = 0V; R
SET
=124Ω ; LM2794:V
SD
= V
IN
(LM2795: V
SD
= 0V).
Symbol
Parameter
Switching Frequency (Note 6)
Conditions
3.0V
≤
V
IN
≤
4.4V
Min
325
Typ
515
Max
675
Units
kHz
f
SW
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:
Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T
J
=150˚C (typ.) and disengages at
T
J
=140˚C (typ.). D1, D2, D3 and D4 may be shorted to GND without damage. P
OUT
may be shorted to GND for 1sec without damage.
Note 3:
The value of
θ
JA
is based on a two layer evaluation board with a dimension of 2in. x1.5in.
Note 4:
In the test circuit, all capacitors are 1.0µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output
voltage and efficiency.
Note 5:
Voltage at which the device switches from charge-pump mode to pass mode or pass mode to charge-pump mode. For example, during pass mode the
device output (Pout) follows the input voltage.
Note 6:
The output switches operate at one eigth of the oscillator frequency, f
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