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TC1240 Datasheet(PDF) 7 Page - Microchip Technology

No. de pieza TC1240
Descripción Electrónicos  Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1240 Datasheet(HTML) 7 Page - Microchip Technology

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 2001-2012 Microchip Technology Inc.
DS21516D-page 7
TC1240/TC1240A
4.0
DETAILED DESCRIPTION
The TC1240/TC1240A charge pump converter dou-
bles the voltage applied to the VIN pin. Conversion con-
sists of a two-phase operation (Figure 4-1). 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, while S1 and S3
are open.
During this second phase, C1 is level-shifted upward by
VIN volts. This connects C1 to the reservoir capacitor
C2, allowing energy to be delivered to the output as
needed. The actual voltage is slightly lower than 2 x VIN
since the four switches (S1-S4) have an on-resistance
and the load drains charge from reservoir capacitor C2.
FIGURE 4-1:
Ideal Switched Capacitor
Charge Pump Doubler.
5.0
TYPICAL APPLICATIONS
5.1
Output Voltage Considerations
The TC1240/TC1240A performs voltage doubling but
does 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 approx-
imately 12
 nominal at +25°C and V
IN = +5.0V for the
TC1240A and 17
 nominal at +25°C and V
IN = +2.8V
for the TC1240. VOUT is approximately +10.0V at light
loads for the TC1240A and +5.6V for the TC1240, and
droops according to the equation below:
EQUATION
5.2
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
commutation capacitor to the output capacitor)
when a voltage difference between the two
capacitors exist.
Most of the conversion losses are due to factors (2) and
(3) above. These losses are given by Equation 5-1.
EQUATION 5-1:
VOUT = 2 x VIN
C1
C2
TC1240/TC1240A
VIN
S1
S3
S4
S2
OSC
VIN
V
OUT
2V
IN
V
DROOP
=
V
DROOP
I
OUT
R
OUT
=
a)
b)
P
LOSS(2,3)
I
OUT
2
R
OUT
=
R
OUT
1
F
SW C1

----------------------
8R
SWITCH
4ESR
C1
ESR
C2
++
+
=


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