TC7660EOA Microchip Technology, TC7660EOA Datasheet - Page 9
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TC7660EOA
Manufacturer Part Number
TC7660EOA
Description
IC CHARGE PUMP DC/DC CONV 8-SOIC
Manufacturer
Microchip Technology
Type
Switched Capacitor (Charge Pump), Invertingr
Datasheet
1.TC7660COA.pdf
(18 pages)
Specifications of TC7660EOA
Package / Case
8-SOIC (3.9mm Width)
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
-1.5 ~ -10 V
Current - Output
20mA
Frequency - Switching
10kHz
Voltage - Input
1.5 ~ 10 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Power - Output
470mW
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Function
Inverting
Output Voltage
- 10 V to - 1.5 V
Output Current
20 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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
TC7660EOA
Manufacturer:
Microchip Technology
Quantity:
612
Part Number:
TC7660EOA
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
FIGURE 5-7:
Converter And Positive Multiplier.
5.7
Since the switches that allow the charge pumping
operation are bidirectional, the charge transfer can be
performed
Figure 5-8 shows a TC7660 transforming -5V to +5V
(or +5V to +10V, etc.). The only problem here is that the
internal clock and switch-drive section will not operate
until some positive voltage has been generated. An ini-
tial inefficient pump, as shown in Figure 5-7, could be
used to start this circuit up, after which it will bypass the
other (D
else the diode and resistor shown dotted in Figure 5-8
can be used to "force" the internal regulator on.
FIGURE 5-8:
Conversion.
10 µF
2002 Microchip Technology Inc.
+
C
C
1
1
1
+
1
2
3
4
Efficient Positive Voltage
Multiplication/Conversion
and D
TC7660
backwards
1
2
3
4
2
C
in Figure 5-7 would never turn on), or
TC7660
2
+
8
7
6
5
Combined Negative
Positive Voltage
as
8
7
6
5
V
+
V
OUT
1 M
easily
= -V
V
D
D
-
1
2
input
-
V
(2 V
as
+
+
OUT
+
C
C
) - (2 V
+
=
forwards.
3
4
10 µF
V
= -V
OUT
F
+
)
TC7660
DS21465B-page 9