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LM2780 PDF даташит

Спецификация LM2780 изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «Ultra-Low Ripple Switched Capacitor Voltage Inverter».

Детали детали

Номер произв LM2780
Описание Ultra-Low Ripple Switched Capacitor Voltage Inverter
Производители National Semiconductor
логотип National Semiconductor логотип 

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LM2780 Даташит, Описание, Даташиты
March 2003
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LM2780
Ultra-Low Ripple Switched Capacitor Voltage Inverter
General Description
The LM2780 is a charge pump that inverts an input voltage
in the range of 1.8V to 5.5V to the corresponding output
voltage of -1.8V to -5.5V. With use of three or four low-cost
external ceramic capacitors, the LM2780 can provide up to
50mA of output current.
The LM2780 operates at a 12kHz typical switching fre-
quency to minimize supply current (60µA typ.). Two charge
pumps operate 180˚ out of phase to significantly reduce the
output voltage ripple compared to that of traditional single-
phase charge pump circuits. If larger output ripple can be
tolerated, optional capacitor C2 may be omitted to reduce
the cost and size of the solution. The LM2780 is available in
an 8-pin Micro SMD chip-scale package.
See also: LM2781, a fast clock (210kHz typ) version of this
topology with even lower output voltage ripple.
Features
n Inverts Input Voltage
n Ultra-Low Voltage Ripple and 8Typical Output
Resistance with Two Flying Capacitors
n Output Resistance of 18Using One Flying Capacitor
n 12kHz (typ.) Switching Frequency
n 8-pin micro SMD Package (1.4mm x 1.4mm x 0.5mm)
Applications
n Cellular Phones
n Pagers
n PDAs
n Op-Amp Power Supplies
n Interface Power Supplies
n Handheld Instruments
Typical Application Circuit
20044601
© 2003 National Semiconductor Corporation DS200446
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LM2780 Даташит, Описание, Даташиты
Connection Diagram
8-Bump Thin Micro SMD Package
NS Package Number TPA08
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20044602
Pin Description
Pin Name
Description
A1 C2+ Secondary flying-capacitor connection
B1 VIN Input voltage. Input range: 1.8V to 5.5V
C1 C1+ Primary flying-capacitor connection
A2 SD Shutdown pin logic input. Low = on, High = shutdown
C2
GND
Ground
A3 C2- Secondary flying-capacitor connection
B3
VOUT
Output voltage. VOUT = -VIN
C3 C1- Primary flying capacitor connection
Ordering Information
Order Number
LM2780TP
LM2780TPX
Package Description
TPA08: Thin Micro SMD
TPA08: Thin Micro SMD
Package
Marking
11
11
Supplied as
Tape and reel, 250 pcs.
Tape and reel, 3000 pcs.
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LM2780 Даташит, Описание, Даташиты
Absolute Maximum Ratings (Notes 1,
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN pin: Voltage to GND
SD pin: Voltage to GND
Output Short-to-GND Duration
(Note 3)
Maximum Junction Temperature
(TJ-MAX)
Storage Temperature Range
Pad Temperature
(Soldering, 10 sec.)
−0.3V to 5.8V
-0.3V to
(VIN + 0.3V), with
5.8V max
1 sec.
150˚C
-65˚C to +150˚C
265˚C
ESD Rating (Note 4)
Human-body model
Machine model
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200V
Operating Ratings (Notes 1, 2)
Input Voltage Range
Junction Temperature (TJ) Range
Ambient Temperature (TA) Range
(Note 5)
1.8V to 5.5V
-40˚C to +90˚C
-40˚C to +85˚C
Thermal Properties
Junction-to-Ambient Thermal
Resistance (θJA), TPA08 Package
(Note 6)
220˚C/W
Electrical Characteristics (Notes 2, 7)
Limits in standard typface are for TJ = 25˚C, and limits in boldface type apply over the full operating junction temperature
range (-40˚C TJ +90˚C). Unless otherwise noted: specifications apply to the LM2780 Typical Application Circuit (pg. 1) with
VIN = 5.0V, V(SD) = 0V, and CIN = COUT = C1 = C2 = 10µF. (Note 8)
Symbol
Parameter
Conditions
Min Typ Max Units
ROUT
IQ
ISD
FSW
VSD
VOUTp-p
PEFF
Output Resistance
(Note 9)
Supply Current
Shutdown Supply Current
Switching Frequency
Shutdown Pin Logic Levels
Output Voltage Ripple
Power Efficiency
IOUT = 10mA, C2 = 10µF
IOUT = 10mA, C2 removed
No load
V(SD) = 5.0V
Normal Operation
1.8V VIN 5.5V
Shutdown Mode
1.8V VIN 5.5V
VIN = 5.0V, IOUT = 10mA
VIN = 5.0V, IOUT = 10mA
6
0
0.5xVIN
8
18
60
0.1
12
40
98
30
40
120 µA
0.5 µA
28 kHz
0.5
V
VIN
mV
%
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of
the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics table.
Note 2: All voltages are with respect to the potential at the GND pin.
Note 3: VOUT may be shorted to GND for one second without damage when the ambient temperature is at or below 85˚C. Prolonged or repeated shorts of VOUT
to GND may damage the device, and should be avoided.
Note 4: The human-body model is a 100pF capacitor discharged through a 1.5kresistor into each pin. The machine model is a 200pF capacitor discharged
directly into each pin.
Note 5: Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 90˚C), the maximum power dissipation
of the device in the application (PD-MAX), and the junction-to-ambient thermal resistance of the part in the application (θJA), as given by the following equation:
TA-MAX = TJ-MAX-OP - (θJA x PD-MAX).
Note 6: Junction-to-ambient thermal resistance of the micro SMD package is highly application and board-layout dependent.
Note 7: Max and Min limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.
Note 8: CIN, COUT, C1, and C2: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
Note 9: Output resistance is a model for the voltage drop at the output, resulting from internal switch resistance, capacitor ESR, and charge pump charge transfer
characteristics. Output voltage can be predicted with the following equation: VOUT = -[VIN - (IOUT x ROUT)]
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