LM2767M5 PDF даташит
Спецификация LM2767M5 изготовлена «National Semiconductor» и имеет функцию, называемую «Switched Capacitor Voltage Converter». |
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Детали детали
Номер произв | LM2767M5 |
Описание | Switched Capacitor Voltage Converter |
Производители | National Semiconductor |
логотип |
9 Pages
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February 2000
LM2767
Switched Capacitor Voltage Converter
General Description
The LM2767 CMOS charge-pump voltage converter oper-
ates as a voltage doubler for an input voltage in the range of
+1.8V to +5.5V. Two low cost capacitors and a diode are
used in this circuit to provide at least 15 mA of output current.
The LM2767 operates at 11 kHz switching frequency to
avoid audio voice-band interference. With an operating cur-
rent of only 40 µA (operating efficiency greater than 90% with
most loads), the LM2767 provides ideal performance for bat-
tery powered systems. The device is manufactured in a
SOT23-5 package.
Features
n Doubles Input Supply Voltage
n SOT23-5 Package
n 20Ω Typical Output Impedance
n 96% Typical Conversion Efficiency at 15mA
Applications
n Cellular Phones
n Pagers
n PDAs, Organizers
n Operational Amplifier Power Suppliers
n Interface Power Suppliers
n Handheld Instruments
Basic Application Circuit
Voltage Doubler
Ordering Information
Order Number
LM2767M5
LM2767M5X
Package
Number
MA05B
MA05B
DS101274-1
Package
Marking
S17B (Note 1)
S17B (Note 1)
Supplied as
Tape and Reel (1000 units/reel)
Tape and Reel (3000 units/reel)
Note 1: The small physical size of the SOT-23 package does not allow for the full part number marking. Devices will be marked with the designation shown in
the column Package Marking.
© 2000 National Semiconductor Corporation DS101274
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Connection Diagram
DS101274-13
Top View With Package Marking
Pin Description
Pin Name
1 VOUT
2 GND
3 CAP−
4 V+
5 CAP+
5-Lead SOT (M5)
DS101274-22
Actual Size
Function
Positive voltage output.
Power supply ground input.
Connect this pin to the negative terminal of the
charge-pump capacitor.
Power supply positive voltage input.
Connect this pin to the positive terminal of the
charge-pump capacitor.
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Absolute Maximum Ratings (Note 2)
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 V+ to VOUT)
VOUT Continuous Output Current
Output Short-Circuit Duration to GND (Note 3)
Continuous Power
Dissipation (TA = 25˚C)(Note 4)
TJMax(Note 4)
5.8V
30 mA
1 sec.
400 mW
150˚C
Operating Ratings
θJA (Note 4)
Junction Temperature Range
Ambient Temperature Range
Storage Temperature Range
Lead Temp. (Soldering, 10 sec.)
ESD Rating (Note 5)
Human Body Model
Machine Model
210˚C/W
−40˚C to 100˚C
−40˚C to 85˚C
−65˚C to 150˚C
240˚C
2kV
200V
Electrical Characteristics
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: V+ = 5V, C1 = C2 = 10 µF. (Note 6)
Symbol
Parameter
Condition
Min Typ Max Units
V+ Supply Voltage
1.8 5.5 V
IQ Supply Current
No Load
40 90 µA
IL
ROUT
Output Current
Output Resistance (Note 7)
1.8V ≤ V+ ≤ 5.5V
IL = 15 mA
15 mA
20 40 Ω
fOSC
Oscillator Frequency
(Note 8)
8 22 50 kHz
fSW Switching Frequency
(Note 8)
4 11 25 kHz
PEFF
Power Efficiency
RL (5.0k) between GND and
OUT
98
%
IL = 15 mA to GND
96
VOEFF
Voltage Conversion Efficiency No Load
99.96
%
Note 2: 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 3: VOUT may be shorted to GND for one second without damage. For temperatures above 85˚C, VOUT must not be shorted to GND or device may be damaged.
Note 4: 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 5: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged directly
into each pin.
Note 6: In the test circuit, capacitors C1 and C2 are 10 µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output
voltage and efficiency.
Note 7: Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information for positive voltage doubler.
Note 8: The output switches operate at one half of the oscillator frequency, fOSC = 2fSW.
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Номер в каталоге | Описание | Производители |
LM2767M5 | Switched Capacitor Voltage Converter | National Semiconductor |
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