TCM828ECT713 Microchip Technology, TCM828ECT713 Datasheet - Page 5

• Manufacturer Part Number: TCM828ECT713
• Description: IC CHARGE PUMP CONV SOT23A-5
• Manufacturer: Microchip Technology
• Type: Switched Capacitor (Charge Pump), Doubler, Invertingr

Specifications of TCM828ECT713

• Package / Case: SOT-23-5, SC-74A, SOT-25
• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -1.5 ~ -5.5 V, ±3 ~ ±11 V
• Current - Output: 25mA
• Frequency - Switching: 12kHz
• Voltage - Input: 1.5 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Power - Output: 240mW
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Function: Inverting, Step Up
• Output Voltage: - 1.5 V to - 5.5 V, 3 V to 11 V
• Output Current: 25 mA
• Maximum Operating Temperature: 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 158-2031-2; 158-2031-2; TCM828ECT713TR

Switched Capacitor
Voltage Converters
Voltage Doubler/Inverter
shown in Figure 6. This circuit performs two functions in
combination. C1 and C2 form the standard inverter circuit
described above. C3 and C4 plus the two diodes form the
voltage doubler circuit. C1 and C3 are the pump capacitors
and C2 and C4 are the reservoir capacitors. Because both
sub-circuits rely on the same switches if either output is
loaded, both will droop toward GND. Make sure that the total
current drawn from both the outputs does not total more
than 40mA.
© 2001 Microchip Technology Inc.
C1
C1
Figure 5. Paralleling TCM828s or TCM829s to Reduce Output Resistance
Another common application of the TCM828/829 is
4
3
5
3
4
5
Figure 6. Combined Doubler and Inverter
TCM828
TCM829
TCM828
TCM829
"1"
C3
DS21488A
2
1
C1
R
V
OUT
2
1
IN
+
V
+
IN
=
R
OUT
. . .
. . .
NUMBER OF DEVICES
D1
3
4
5
D2
D1, D2 = 1N4148
OF SINGLE DEVICE
TCM828
TCM829
V
. . .
OUT =
"n"
C2
C4
V
IN
–
V
(V
V
OUT =
OUT = (
FD1
2
1
)
–
C2
V
2V
(V
IN
–
V
FD2
IN
OUT
) –
)
5
Diode Protection for Heavy Loads
currents being delivered by a positive source, diode protec-
tion may be needed. The OUT pin should not be allowed to
be pulled above ground. This is accomplished by connect-
ing a Schottky diode (1N5817) as shown in Figure 7.
Layout Considerations
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
When heavy loads require the OUT pin to sink large
As with any switching power supply circuit good layout
Figure 7. High V
TCM828
TCM829
GND
OUT
–
Load Current
4
1
TCM828/829-4 5/22/00
TCM828
TCM829