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LM2685 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM2685
Descripción Electrónicos  Dual Output Regulated Switched Capacitor Voltage Converter
Download  9 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2685 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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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
IN to GND or
GND to V
NEG)
6.8V
SDN, SDP, CE
(GND − 0.3V) to
(V
IN + 0.3V)
V
05 Continuous Output Current
80mA
V
05 Short-Circuit Duration to GND
(Note 2)
Indefinite
Continuous Power Dissipation (T
A
= 25˚C) (Note 3)
600mW
T
JMAX (Note 3)
150˚C
θ
JA (Note 3)
140˚C/W
Operating Ambient Temp. Range
−40˚C to 85˚C
Operating Junction Temp. Range
−40˚C to 125˚C
Storage Temp. Range
−65˚C to 150˚C
Lead Temp. (Soldering, 10 sec.)
300˚C
ESD Rating (Note 4)
2kV
Electrical Characteristics
Limits with standard typeface apply for T
J = 25˚C, and limits in boldface type apply over the full temperature range. Unless
otherwise specified V
IN = 3.6V, C1 =C2 =C3 =C5 = 2.2µF. C4 = 4.7µF (Note 5)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
+
Supply Voltage
2.85
6.5
V
I
Q
Supply Current
No Load
800
1600
µA
No Load, V
IN = 6.5V
300
600
I
SD
Shutdown Supply Current
V
IN = 6.5V
6
30
µA
V
SD
Shutdown Pin Input Voltage for
CE, SDP, SDN
Logic Input High @ 6.5V
2.4
V
Logic Input Low @ 6.5V
0.8
I
L (+5V)
Output Current at V
05
2.85V < V
IN < 6.5V
50
mA
R
O (−5V)
Output Resistance at V
NEG
I
L = 15mA (Note 6)
20
40
F
SW
Switch Frequency
85
130
180
kHz
P
EFF
Average Power Efficiency at V
05
2.85V
≤ V
IN ≤ 6.5V
I
L = 25mA to GND
82
%
V
05
Output Regulation
1mA < I
L < 50mA, VIN = 6.5V
(Note 7)
4.848
5.05
5.252
V
1mA < I
L < 50mA, VIN = 6.5V
(Note 7)
4.797
5.05
5.303
G
LINE
Line Regulation
2.85V < V
IN < 3.6V
0.25
%/V
3.6V < V
IN < 6.5V
0.05
G
LOAD
Load Regulation
1mA < I
L < 50mA, VIN = 6.5V
0.3
1.0
%
R
SW
Series Switch Resistance V
NEG to
V
NSW
V
IN > 2.85V
1.5
V
05 to VPSW
5.0
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: V05 may be shorted to GND without damage. However, shorting VNEG to V05 may damage the device and must be avoided. Also, for temperature above
85˚C, V05 must not be shorted to GND or device may be damaged.
Note 3: The maximum allowable power dissipation is calculated by using PDMAX =(TJMAX —TA)/θJA, where TJMAX is the maximum junction temperature, TA is the
ambient temperature and
θJA is the junction-to-ambient thermal resistance of the specified package.
Note 4: The human body model is a 100 pF capacitor discharged through a 1.5k
Ω resistor into each pin.
Note 5: In the typical operating circuit, capacitors C1 and C2 are 2.2µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance,
reduce output voltage and efficiency.
Note 6: Specified output resistance includes internal switch resistance and ESR of capacitors. See the Detailed Device Description section.
Note 7: The 50 mA maximum current assumes no current is drawn from VDBL pin. See Voltage Doubler section in the Detailed Device Description.
www.national.com
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