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LM2787BPX датащи(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM2787BPX
подробное описание детали  Low Noise Regulated Switched Capacitor Voltage
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2787BPX датащи(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 OUT)
+ 5.8V
SD
(GND − 0.3V) to
(V
IN + 0.3V)
V
NEG and VOUT Continuous Output
Current
10mA
V
OUT Short-Circuit Duration to GND
(Note 2)
1 sec.
Continuous Power Dissipation (T
A =
25˚C) (Note 3)
600mW
T
JMAX (Note 3)
150˚C
θ
JA (Note 3)
220˚C/W
Operating Input Voltage Range
2.7V to 5.5V
Operating Output Current Range
0mA to 10mA
Operating Ambient
−40˚C to 85˚C
Temp. Range
Operating Junction Temp. Range
−40˚C to 110˚C
Storage Temperature
−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 = 1µF.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
Q
Supply Current
Open Circuit, No Load
400
950
µA
I
SD
Shutdown Supply Current
0.05
1
µA
F
SW
Switching Frequency
(Note 5)
V
IN = 3.6V
140
260
450
kHz
η
POWER
Power Efficiency at V
NEG
I
L = 3.6mA
I
L = 10mA
94
91
%
T
START
Start Up time
120
600
µs
R
NEG
Output Resistance to V
NEG
(Note 6)
30
V
R
Output Voltage Ripple
(Note 7)
I
L =2.5mA, VOUT = −2.7V
I
L = 10mA, VOUT = −3.8V
1mV
V
FB
Feedback Pin Reference
Voltage
I
L = 2.5mA (Note 8)
−1.25
−1.20
−1.15
V
V
OUT
Adjustable Output Voltage
5.5V
≥ V
IN
≥ 2.7V, 2.5mA ≥ I
L
5.5V
≥ V
IN
≥ 3.0V, 10mA ≥ I
L
0mA
−(V
IN −0.3V)
−(V
IN −1.2V)
V
Load Regulation
0 to 10mA, V
OUT = − 2.4V
5
mV/mA
Line Regulation
5.5V
≥ V
IN
≥ 2.7V, I
L = 2.5mA
1
mV/V
V
IH
Shutdown Pin Input Voltage
High
5.5V
≥ V
IN
≥ 2.7V
2.4
V
V
IL
Shutdown Pin Input Voltage
Low
5.5V
≥ V
IN
≥ 2.7V
0.8
V
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 VIN may damage the device and must be avoided. Also, for
temperatures above TA = 85˚C, OUT must not be shorted to GND or VIN or device may be damaged.
Note 3: The maximum power dissipation must be de-rated at elevated temperatures and is limited by TJMAX (maximum junction temperature), TA (ambient
temperature) and
θJA (junction-to-ambient thermal resistance). The maximum power dissipation at any temperature is:
PDiss
MAX =(TJMAX —TA)/
θ
JA up to the value listed in the Absolute Maximum Ratings.
Note 4: Rating is for the human body model, a 100pF capacitor discharged through a 1.5 k
Ω resistor into each pin.
Note 5: The output switches operate at one half the oscillator frequency, fOSC =2fSW.
Note 6: Current drawn from VNEG pin decreases power efficiency and will increase output voltage ripple.
Note 7: In the test circuit, capacitors C1,C2, and C3 are 1µF, 0.30Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, increase
output voltage ripple, and reduce efficiency.
Note 8: The feedback resistors R1 and R2 are 200k
Ω resistors.
www.national.com
3


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