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TJ7660 데이터시트 PDF




HTC에서 제조한 전자 부품 TJ7660은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 TJ7660 기능
기능 Charge Pump Voltage Converters
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TJ7660 데이터시트, 핀배열, 회로
Charge Pump Voltage Converters
TJ7660
FEATURES
• Simple Conversion of +5V Logic Supply to ±5V Supplies
• Simple Voltage Multiplication (VOUT = (-) nVIN)
• Typical Open Circuit Voltage Conversion Efficiency 99.9%
• Typical Power Efficiency 98%
• Wide Operating Voltage Range- TJ7660 1.5V to 10.0V
• Easy to Use - Requires Only 2 External Non-Critical
Passive Components
• No External Diode Over Full Temp. and Voltage Range
SOP-8 PKG
DIP-8 PKG
APPLICATION
• On Board Negative Supply for Dynamic RAMs
• Localized µProcessor (8080 Type) Negative Supplies
• Inexpensive Negative Supplies
• Data Acquisition Systems
www.DataSheet4U.com
< Pin Configuration
ORDERING INFORMATION
Device
Package
TJ7660D
SOP-8
TJ7660N
D I P-8
DESCRIPTION
The HTC TJ7660 is a monolithic CMOS power supply circuit which offers unique performance
advantages over previously available devices.
The TJ7660 performs supply voltage conversions from positive to negative for an input range
of +1.5V to +10.0V resulting in complementary output voltages of -1.5V to -10.0V. Only 2
noncritical external capacitors are needed for the charge pump and charge reservoir functions.
The TJ7660 can also be connected to function as voltage doublers and will generate output
voltages up to +18.6V with a +10V input. Contained on the chip are a series DC supply
regulator, RC oscillator, voltage level translator, and four output power MOS switches.
A unique logic element senses the most negative voltage in the device and ensures that the
output N-Channel switch source-substrate junctions are not forward biased. This assures
latchup free operation.
The oscillator, when unloaded, oscillates at a nominal frequency of 10kHz for an input supply
voltage of 5.0V.
This frequency can be lowered by the addition of an external capacitor to the “OSC” terminal,
or the oscillator may be overdriven by an external clock.
The “LV” terminal may be tied to GROUND to bypass the internal series regulator and improve
() ( )
Jan. 2007-Rev 1.0
1
HTC




TJ7660 pdf, 반도체, 판매, 대치품
Charge Pump Voltage Converters
Typical Performance Curves
Output Resistance vs. Supply Voltage
TJ7660
10000
1000
100
10
130
120
110
100
90
80
0
123456
Supply Voltage(v)
Output Load vs. Load Current(V+=+5)
1 5 10 15
Load Current(mA)
7
20
8
25
Power Convension Efficiency vs.Load Current(V+=+5V)
100
90
80
70
60
50
40
30
20
10
0
5
10 15 20 25 30
Load Current(mA)
NOTE:
6. These curves include in the supply current that current fed directly into the load RL from the V+ (See Figure 11). Thus,
approximately half the supply current goes directly to the positive side of the load, and the other half, through the TJ7660,
to the negative side of the load. Ideally, VOUT = 2VIN, IS = 2IL, so VIN x IS = VOUT x IL.
Jan. 2007-Rev 1.0
4
HTC

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TJ7660 전자부품, 판매, 대치품
Charge Pump Voltage Converters
TJ7660
TJ7660
TJ7660
Typical Applications
Simple Negative Voltage Converter
Themajority of applications will undoubtedly utilize the TJ7660 for generation of negative supply
voltages. Figure 13 shows typical connections to provide a negative supply negative (GND) for
supply voltages below 3.5V.
The output characteristics of the circuit in Figure 13A can be approximated by an ideal voltage
source in series with a resistance as shown in Figure 13B. The voltage source has a value of -V+.
The output impedance (RO) is a function of the ON resistance of the internal MOS switches (shown
in Figure 12), the switching frequency, the value of C1 and C2, and the ESR (equivalent series
resistance) of C1 and C2. A good first order approximation for RO is:
RO = 2(RSW1 + RSW3 + ESRC1) +
2(RSW2 + RSW4 + ESRC1) +
RO = 2(RSW1 + RSW3 + ESRC1) +
1/(fPUMP) (C1)+ ESRC2
(fPUMP = fOSC/2 , RSWX = MOSFET switch resistance)
Combining the four RSWX terms as RSW, we see that:
RO = 2 (RSW) + 1/(fPUMP) (C1)+ 4 (ESRC1) + ESRC2
RSW, the total switch resistance, is a function of supply voltage and temperature (See the Output
Source Resistance graphs), typically 23Ω at 25oC and 5V. Careful selection of C1 and C2 will reduce
the remaining terms, minimizing the output impedance. High value capacitors will reduce the
1/(fPUMP • C1) component, and low ESR capacitors will lower the ESR term. Increasing the oscillator
frequency will reduce the 1/(fPUMP • C1) term, but may have the side effect of a net increase in
output impedance when C1 > 10µF and there is no longer enough time to fully charge the
capacitors every cycle. In a typical application where fOSC = 10kHz and C = C1 = C2 = 10µF:
RO = 2 (23) +1/(5 • 103) (10-5)+ 4 (ESRC1) + ESRC2
RO = 46 + 20 + 5 (ESRC)
Since the ESRs of the capacitors are reflected in the output impedance multiplied by a factor of 5,
a high value could potentially swamp out a low 1/(fPUMP • C1) term, rendering an increase in
switching frequency or filter capacitance ineffective. Typical electrolytic capacitors may have ESRs
as high as 10Ω.
Jan. 2007-Rev 1.0
7
HTC

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TJ7660

Charge Pump Voltage Converters

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