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MAX829 Datasheet(PDF) 6 Page - ON Semiconductor

Part # MAX829
Description  Switched Capacitor Voltage Converter
Download  17 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MAX829 Datasheet(HTML) 6 Page - ON Semiconductor

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MAX828, MAX829
http://onsemi.com
6
MAX828: C1 = C2 = C3 = 10 mF
MAX829: C1 = C2 = C3 = 3.3 mF
6
4
2
3
1
OSC
−Vout
C1
C2
RL
+
+
C3
Vin
+
Figure 20. Test Setup/Voltage Inverter
DETAILED OPERATING DESCRIPTION
The MAX828/829 charge pump converters inverts the
voltage applied to the Vin pin. Conversion consists of a
two−phase operation (Figure 21). 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.
Figure 21. Ideal Switched Capacitor Charge Pump
S3
S4
C2
C1
S1
S2
Vin
−Vout
From Osc
APPLICATIONS INFORMATION
Output Voltage Considerations
The MAX828/829 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 and 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)
Charge Pump Efficiency
The overall power 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.
P
LOSS(2,3,4) +
Iout
2
Rout ^ Iout
2
1
(f
OSC
)C1
) 8R
SWITCH )
4ESR
C1
) ESR
C2
(eq. 1)
The 1/(fOSC)(C1) term in Equation 1 is the effective output
resistance of an ideal switched capacitor circuit (Figures 22
and 23).
The losses due to charge transfer above are also shown in
Equation 2. The output voltage ripple is given by Equation 3.
) 0.5C2 (VRIPPLE2 * 2VoutVRIPPLE)] fOSC
PLOSS + [0.5C1 (Vin
2
* Vout2)
(eq. 2)
V
RIPPLE +
Iout
(f
OSC
)(C
2
)
) 2(I
out)(ESRC2
)
(eq. 3)
RL
C2
C1
Vin
Vout
f
Figure 22. Ideal Switched Capacitor Model
RL
C2
Vin
Vout
REQUIV
R
EQUIV +
1
f
C1
Figure 23. Equivalent Output Resistance


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