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TCM829ECT Datasheet(PDF) 13 Page - Microchip Technology

Part # TCM829ECT
Description  Switched Capacitor Voltage Converters
PDF  26 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TCM829ECT Datasheet(HTML) 13 Page - Microchip Technology

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© 2010 Microchip Technology Inc.
DS21488B-page 13
TCM828/TCM829
5.0
APPLICATIONS INFORMATION
5.0.1
OUTPUT VOLTAGE
CONSIDERATIONS
The
TCM828/TCM829
devices
perform
voltage
conversion, but do not provide regulation. The output
voltage will droop in a linear manner with respect to
load current. The value of this equivalent output
resistance is approximately 25
Ω nominal at +25°C and
VIN = +5V. VOUT is approximately – 5V at light loads,
and droops according to the equation below:
VDROOP =IOUT ×ROUT
VOUT =–(VIN –VDROOP)
5.0.2
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 effective
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 above. These losses are shown in Equation 5-1.
EQUATION 5-1:
The 1/(fOSC)(C1) term in Equation 5-1 is the effective
output resistance of an ideal switched capacitor circuit
(Figures 5-1 and 5-2).
The losses in the circuit due to factor 4 above are also
shown in Equation 5-2. The output voltage ripple is
shown in Equation 5-3.
EQUATION 5-2:
EQUATION 5-3:
FIGURE 5-1:
Ideal Switched Capacitor
Model.
FIGURE 5-2:
Equivalent Output
Resistance.
I
OUT
2
1
f
OS C
()C1
--------------------------
8R
SWITCH
4ES R
C1
ESR
C2
++
+
×
≅
P
LOSS 234
,,
()
I
OUT
2
R
OUT
×
=
2V
OUT
V
RIP PLE
]
–
f
×
OSC
P
LOSS 4
()
0.5
() C1
() V
(
IN
2
V
OUT
2
)
0.5
() C2
() V
RIPPLE
2 –
(
++
[
=
V
RIPPLE
I
OUT
f
OSC
() C2
()
----------------------------
2 I
OUT
() ESR
C2
()
+
=
V+
VOUT
RL
C1
C2
f
V+
VOUT
REQUIV
RL
C2
R
EQUIV
1
fC1
×
---------------
=



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