TC682EOA Microchip Technology, TC682EOA Datasheet - Page 6

• Manufacturer Part Number: TC682EOA
• Description: IC INVERTING VOLT DOUBLER 8SOIC
• Manufacturer: Microchip Technology
• Type: Switched Capacitor (Charge Pump), Doubler, Invertingr

Specifications of TC682EOA

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -4.8 ~ -11 V
• Current - Output: 10mA
• Frequency - Switching: 12kHz
• Voltage - Input: 2.4 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 470mW
• Primary Input Voltage: 5.5V
• No. Of Outputs: 1
• Output Current: 10mA
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Peak Reflow Compatible (260 C): Yes
• Switching Frequency Max: 12kHz
• Function: Inverting
• Output Voltage: - 10 V
• Maximum Operating Temperature: 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

TC682
4.3
Paralleling multiple TC682s reduces the output
resistance of the converter. The effective output
resistance is the output resistance of a single device
divided by the number of devices. As illustrated in
Figure , each requires separate pump capacitors C
and C
FIGURE 4-2:
FIGURE 4-3:
DS21453C-page 6
GND
V
IN
2
10 μF
10 μF
, but all can share a single reservoir capacitor.
Paralleling Devices
+
–
+
–
+
–
3V
10 μF
10 μF
C
C
C
C
1
1
2
2
+
–
+
–
Paralleling TC682 for Lower Output Source Resistance
Negative Supply Derived from 3V Battery
+
–
+
–
TC682
GND
V
IN
C
C
C
C
1
1
2
2
+
–
+
–
TC682
GND
V
IN
V –
V –
OUT
OUT
–
+
C
10 μF
22 μF
OUT
10 μF
1
–
+
+
–
–
4.4
Figure 4-3 shows a -5V power supply using one 3V
battery. The TC682 provides -6V at V
regulated to -5V by the negative LDO. The input to the
TC682 can vary from 3V to 5.5V without affecting
regulation appreciably. A TC54 device is connected to
the battery to detect undervoltage. This unit is set to
detect at 2.7V. With higher input voltage, more current
can be drawn from the outputs of the TC682. With 5V
at V
Assuming 150Ω source resistance for the converter,
with I
V
V
TC54VC2702Exx
IN
IN
Negative LDO
C
C
C
C
1
1
2
2
Regulator
+
–
+
–
IN
V
V
L
, 10 mA can be drawn from the regulated output.
SS
SS
–
TC682
= 10 mA, the charge pump will droop 1.5V.
GND
V
IN
-5V Regulated Supply From A
Single 3V Battery
V
V
OUT
OUT
+
–
V –
OUT
1 μF
© 2006 Microchip Technology Inc.
LOW BATTERY
-5 Supply
Ground
–
+
C –
OUT
22 μF
OUT
, which is
Negative
Supply