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PDF NCP1729 Data sheet ( Hoja de datos )
| Número de pieza | NCP1729 | |
| Descripción | Switched Capacitor Voltage Inverter | |
| Fabricantes | ON | |
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NCP1729
Switched Capacitor
Voltage Inverter
The NCP1729 is a CMOS charge pump voltage inverter that is
designed for operation over an input voltage range of 1.5 V to 5.5 V
with an output current capability in excess of 50 mA. The operating
current consumption is only 122 mA, and a power saving shutdown
input is provided to further reduce the current to a mere 0.4 mA. The
device contains a 35 kHz oscillator that drives four low resistance
MOSFET switches, yielding a low output resistance of 26 W and a
voltage conversion efficiency of 99%. This device requires only two
external 3.3 mF capacitors for a complete inverter making it an ideal
solution for numerous battery powered and board level applications.
The NCP1729 is available in the space saving TSOP−6 package.
Features
• Operating Voltage Range of 1.5 V to 5.5 V
• Output Current Capability in Excess of 50 mA
• Low Current Consumption of 122 mA
• Power Saving Shutdown Input for a Reduced Current of 0.4 mA
• Operation at 35 kHz
• Low Output Resistance of 26 W
• Space Saving TSOP−6 Package
• NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
• These Devices are Pb−Free and are RoHS Compliant
Typical Applications
• LCD Panel Bias
• Cellular Telephones
• Pagers
• Personal Digital Assistants
• Electronic Games
• Digital Cameras
• Camcorders
• Hand Held Instruments
−Vout
16
Vin 2
3
5
4
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TSOP−6
1 (SOT23−6)
SN SUFFIX
CASE 318G
MARKING
DIAGRAM
6
XXXAYW G
G
1
XXX
A
Y
W
G
= Device Code
= Assembly Location
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
Vout 1
Vin 2
C− 3
6 C+
5 SHDN
4 GND
(Top View)
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 22 of this data sheet.
This device contains 77 active transistors.
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2016
February, 2016 − Rev. 6
1
Publication Order Number:
NCP1729/D
1 page  
NCP1729
1
OSC
Vin + 2
C3
3
6
5
4
−Vout
+C2 RL
+
C1
C1 = C2 = C3 = 3.3 mF
Figure 14. Test Setup/Voltage Inverter
DETAILED OPERATING DESCRIPTION
The NCP1729 charge pump converter inverts the voltage
applied to the Vin pin. Conversion consists of a two−phase
operation (Figure 15). During the first phase, switches S2
and S4 are open and S1 and S3 are closed. During this time,
C1 charges to the voltage on Vin and load current is supplied
from C2. During the second phase, S2 and S4 are closed, and
S1 and S3 are open. This action connects C1 across C2,
restoring charge to C2.
S1
Vin
S2
C1
S3
From OSC
C2
S4
−Vout
Charge Pump Efficiency
The overall power conversion efficiency of the charge
pump is affected by four factors:
1. Losses from power consumed by the internal
oscillator, switch drive, etc. (which vary with input
voltage, temperature and oscillator frequency).
2. I2R losses due to the on−resistance of the MOSFET
switches on−board the charge pump.
3. Charge pump capacitor losses due to
Equivalent Series Resistance (ESR).
4. Losses that occur during charge transfer from the
commutation capacitor to the output capacitor when
a voltage difference between the two capacitors
exists.
Most of the conversion losses are due to factors 2, 3 and 4.
These losses are given by Equation 1.
PLOSS(2,3,4) + Iout 2 Rout ^ Iout 2
ƪ ƫ1
(fOSC)C1
)
8RSWITCH
)
4ESRC1
)
ESRC2
(eq. 1)
The 1/(fOSC)(C1) term in Equation 1 is the effective output
resistance of an ideal switched capacitor circuit (Figures 16
and 17).
The losses due to charge transfer above are also shown in
Equation 2. The output voltage ripple is given by Equation 3.
PLOSS + [ 0.5C 1 (Vin2 * Vout2)
) 0.5C2 (VRIPPLE2 * 2VoutVRIPPLE)]
fOSC
(eq. 2)
VRIPPLE
+
Iout
(fOSC)(C2)
)
2(Iout)(ESRC2)
(eq. 3)
f
Vin
Vout
Figure 15. Ideal Switched Capacitor Charge Pump
C1 C2 RL
APPLICATIONS INFORMATION
Output Voltage Considerations
The NCP1729 performs voltage conversion but does not
provide regulation. The output voltage will drop in a linear
manner with respect to load current. The value of this
equivalent output resistance is approximately 26 W nominal
at 25°C with Vin = 5.0 V. Vout is approximately −5.0 V at
light loads, and drops according to the equation below:
VDROP + Iout Rout
Vout + * (Vin * VDROP)
Figure 16. Ideal Switched Capacitor Model
REQUIV
Vin
REQUIV + f
1
C1
Vout
C2 RL
Figure 17. Equivalent Output Resistance
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5
5 Page 
NCP1729
Vin +
1
OSC
2
6
5
+
+ Vout
34
Capacitors = 3.3 mF
Figure 26. Positive Output Voltage Doubler
A single device can be used to construct a positive voltage doubler. The output voltage is approximately equal to 2.0 Vin
minus the forward voltage drop of each external diode. The performance characteristics for the above converter are shown
below. Note that curves A and C show the circuit performance with economical 1N4148 diodes, while curves B and D are with
lower loss MBRA120E Schottky diodes.
10.0
D
8.0
C
6.0 B
4.0
A
2.0
TA = 25°C
0
0 10 20 30 40
Iout, OUTPUT CURRENT (mA)
Figure 27. Doubler Load Regulation, Output
Voltage vs. Output Current
Curve
A
B
C
D
Vin (V)
3.0
3.0
5.0
5.0
All Diodes
1N4148
Rout (W)
32
MBRA120E
25
1N4148
24
MBRA120E
19.3
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