Inverting Voltage Doubler General Description TC682 CMOS cha
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TC682
Inverting Voltage Doubler
General Description
TC682 CMOS charge pump converter that provides inverted doubled output from single positive supply. on-board 12kHz (typical) oscillator provides clock only external capacitors required full circuit implementation. output source impedance (typically 140), provides output current 10mA. TC682 features quiescent current high efficiency, making ideal choice wide variety applications that require negative voltage derived from single positive supply (for example: generation from lithium cell -10V generated from logic supply). minimum external parts count small physical size TC682 make useful many mediumcurrent, dual voltage analog power supplies.
99.9% Voltage Conversion Efficiency Power Conversion Efficiency Wide Input Voltage Range +2.4V +5.5V Only External Capacitors Required 185µA Supply Current Space-Saving 8-Pin SOIC 8-Pin PDIP Packages
Applications
-10V from Logic Supply from Single Lithium Cell Portable Handheld Instruments Cellular Phones Display Bias Generator Panel Meters Operational Amplifier Power Supplies
Functional Block Diagram
+2.4V +5.5V
Device Selection Table
Part Number TC682COA TC682CPA TC682EOA TC682EPA Package 8-Pin SOIC 8-Pin PDIP 8-Pin SOIC 8-Pin PDIP Operating Temp. Range +70°C +70°C -40°C +85°C -40°C +85°C
TC682
VOUT Caps 3.3µF VOUT VOUT COUT
Package Type
8-Pin PDIP
VOUT TC682CPA TC682EPA VOUT TC682COA TC682EOA
8-Pin SOIC
2002 Microchip Technology Inc.
DS21453B-page
TC682
ELECTRICAL CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only functional operation device these other conditions above those indicated operation sections specifications implied. Exposure Absolute Maximum Rating conditions extended periods affect device reliability.
Absolute Maximum Ratings*
.+5.8V dV/dT 1V/µsec VOUT .-11.6V Short-Circuit Duration VOUT Continuous Power Dissipation 70°C) 8-Pin PDIP .730mW 8-Pin SOIC .470mW Operating Temperature Range.-40°C +85°C Storage Temperature (Unbiased) .-65°C +150°C
TC682 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Over operating temperature range, +5V, test circuit Figure unless otherwise noted. Symbol ROUT Parameter Supply Voltage Range Supply Current VOUT Source Resistance 99.9 Units
Test Conditions 25°C 10mA, 25°C 10mA 5mA, 2.8V 25°C VOUT,
FOSC PEFF VOUTEFF
Oscillator Frequency Power Efficiency Voltage Conversion Efficiency
DS21453B-page
2002 Microchip Technology Inc.
TC682
DESCRIPTION
descriptions pins listed Table 2-1.
TABLE 2-1:
(8-Pin PDIP, SOIC)
FUNCTION TABLE
Symbol VOUT Input. Capacitor negative terminal. Input. Capacitor positive terminal. Input. Capacitor negative terminal. Output. Negative output voltage (-2VIN). Input. Ground. Input. Power supply voltage. Input. Capacitor positive terminal. connection. Description
2002 Microchip Technology Inc.
DS21453B-page
TC682
DETAILED DESCRIPTION
TC682 TEST CIRCUIT
FIGURE 3-3:
CHARGE PUMP PHASE
FIGURE 3-1:
(+5V)
VOUT V-OUT COUT
-10V VOUT
TC682
Caps 3.3µF
Maximum Operating Limits
Phase
charge storage before this phase clock cycle, capacitor already charged +5V. then switched ground charge transferred C2-. Since +5V, voltage potential across capacitor -10V.
TC682 on-chip zener diodes that clamp approximately 5.8V, VOUT -11.6V. Never exceed maximum supply voltage excessive current will shunted these diodes, potentially damaging chip. TC682 will operate over entire operating temperature range with input voltage 5.5V.
Efficiency Considerations
FIGURE 3-2:
CHARGE PUMP PHASE
Theoretically charge pump voltage multiplier approach 100% efficiency under following conditions: charge pump switches have virtually offset extremely resistance. Minimal power consumed drive circuitry. impedances reservoir pump capacitors negligible. TC682, efficiency shown below: Voltage Efficiency VOUT (-2VIN) VOUT -2VIN VDROP VDROP (IOUT) (ROUT) Power Loss IOUT (VDROP) There will substantial voltage difference between VOUT -2VIN impedances pump capacitors high with respect their respective output loads. Larger values reservoir capacitor will reduce output ripple. Larger values both pump reservoir capacitors improve efficiency. Section "Capacitor Selection".
VOUT
Phase
transfer phase clock connects negative terminal negative side reservoir capacitor positive terminal ground, transferring generated -10V Simultaneously, positive side capacitor switched negative side connected ground. then switched Phase begins again.
DS21453B-page
2002 Microchip Technology Inc.
TC682
TYPICAL APPLICATIONS
Negative Doubling Converter
Output voltage ripple affected Typically larger value less ripple given load current. formula VRIPPLE given below: VRIPPLE {1/[2(fPUMP C3)] 2(ESRC3)} (IOUT) 10µF (0.5 ESR) capacitor fPUMP 10kHz IOUT 10mA peak-to-peak ripple voltage output will less then 60mV. most applications (IOUT 10mA) 10-20µF capacitor 1-5µF pump capacitors will suffice. Table shows VRIPPLE different values (assume ESR).
most common application TC682 charge pump voltage converter which provides negative output times positive input voltage (Figure 4-1).
FIGURE 4-1:
INVERTING VOLTAGE DOUBLER
22µF
TABLE 4-1:
OUTPUT RESISTANCE
ROUT() 4085 2084
(µF)
22µF V-OUT
22µF
TC682
0.05 0.10 0.47 1.00 3.30 5.00 10.00 22.00 100.00
V-OUT
Capacitor Selection
output resistance TC682 determined, part, capacitors used. expression ROUT derived shown below:
ROUT 2(RSW1 RSW2 ESRC1 RSW3 RSW4 ESRC2) +2(RSW1 RSW2 ESRC1 RSW3 RSW4 ESRC2) +1/(fPUMP +1/(fPUMP +ESRC3
TABLE 4-2:
(µF) 0.50 1.00 3.30 5.00 10.00 22.00 100.00
VRIPPLE PEAK-TO-PEAK (IOUT 10mA)
VRIPPLE (mV) 1020
Assuming switch resistances approximately equal:
ROUT 16RSW 4ESRC1 4ESRC2 ESRC3 +1/(fPUMP +1/(fPUMP
ROUT typically +25°C with 3.3µF capacitors. fixed term (16RSW) about 80-90. seen easily that increasing decreasing values will affect efficiency changing ROUT. However, careful about ESR. This term quickly become dominant with large electrolytic capacitors. Table shows ROUT various values (assume ESR). must rated 6VDC greater while must rated 12VDC greater.
2002 Microchip Technology Inc.
DS21453B-page
TC682
Paralleling Devices
Paralleling multiple TC682s reduces output resistance converter. effective output resistance output resistance single device divided number devices. illustrated Figure 4-2, each requires separate pump capacitors share single reservoir capacitor.
Regulated Supply From Single Battery
Figure shows power supply using battery. TC682 provides VOUT, which regulated negative LDO. input TC682 vary from 5.5V without affecting regulation appreciably. TC54 device connected battery detect undervoltage. This unit detect 2.7V. With higher input voltage, more current drawn from outputs TC682. With VIN, 10mA drawn from regulated output. Assuming source resistance converter, with IL-= 10mA, charge pump will droop 1.5V.
FIGURE 4-2:
PARALLELING TC682 LOWER OUTPUT SOURCE RESISTANCE
10µF
10µF
TC682
10µF V-OUT 10µF
TC682
V-OUT Negative Supply C-OUT 22µF
FIGURE 4-3:
NEGATIVE SUPPLY DERIVED FROM BATTERY
10µF 10µF
Ground
TC682
V-OUT 22µF VOUT
Supply
Negative Regulator
TC54VC2702Exx VOUT BATTERY
DS21453B-page
2002 Microchip Technology Inc.
TC682
Note:
TYPICAL CHARACTERISTICS
graphs tables provided following this note statistical summary based limited number samples provided informational purposes only. performance characteristics listed herein tested guaranteed. some graphs tables, data presented outside specified operating range (e.g., outside specified power supply range) therefore outside warranted range.
Circuit Figure 3-1, COUT 3.3µF, 25°C unless otherwise noted.
Output Resistance
3.3µF OUTPUT RESISTANCE
VOUT -7.5 -8.0 -8.5 -9.0 -9.5 -10.0 -10.5 LOAD CURRENT (mA)
VOUT Load Current
Supply Current
OUTPUT SOURCE RESISTANCE
Output Source Resistance Temperature
IOUT 10mA
LOAD
SUPPLY CURRENT (µA)
TEMPERATURE (°C)
Output Ripple Output Current
OUTPUT RIPPLE PK-PK)
10µF
100µF
OUTPUT CURRENT (mA)
2002 Microchip Technology Inc.
DS21453B-page
TC682
PACKAGING INFORMATION
Package Marking Information
Package marking data available this time.
Package Dimensions
8-Pin Plastic
.260 (6.60) .240 (6.10)
.045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92)
.070 (1.78) .040 (1.02)
.310 (7.87) .290 (7.37)
.040 (1.02) .020 (0.51)
.015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87)
MIN.
.110 (2.79) .090 (2.29)
.022 (0.56) .015 (0.38)
Dimensions: inches (mm)
8-Pin SOIC
.157 (3.99) .150 (3.81)
.244 (6.20) .228 (5.79)
.050 (1.27) TYP.
.197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) MAX. .050 (1.27) .016 (0.40) Dimensions: inches (mm) .010 (0.25) .007 (0.18)
DS21453B-page
2002 Microchip Technology Inc.
TC682
Sales Support
Data Sheets Products supported preliminary Data Sheet have errata sheet describing minor operational differences recommended workarounds. determine errata sheet exists particular device, please contact following: Your local Microchip sales office Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision silicon Data Sheet (include Literature using. Customer Notification System Register site (www.microchip.com/cn) receive most current information products.
2002 Microchip Technology Inc.
DS21453B-page9
TC682
NOTES:
DS21453B-page10
2002 Microchip Technology Inc.
TC682
Information contained this publication regarding device applications like intended through suggestion only superseded updates. your responsibility ensure that your application meets with your specifications. representation warranty given liability assumed Microchip Technology Incorporated with respect accuracy such information, infringement patents other intellectual property rights arising from such otherwise. Microchip's products critical components life support systems authorized except with express written approval Microchip. licenses conveyed, implicitly otherwise, under intellectual property rights.
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2002 Microchip Technology Inc.
DS21453B-page
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DS21453B-page
2002 Microchip Technology Inc.
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