Positive Doubling Charge Pumps with Shutdown SOT-23 Package Charg
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TC1240/TC1240A
Positive Doubling Charge Pumps with Shutdown SOT-23 Package
Charge Pumps 6-Pin SOT-23A Package >99% Typical Voltage Conversion Efficiency Voltage Doubling Input Voltage Range, TC1240: +2.5V +4.0V, TC1240A: +2.5V +5.5V Output Resistance, TC1240: (Typical) TC1240A: (Typical) Only External Capacitors Required Supply Current, TC1240: 180µA (Typical) TC1240A: 550µA (Typical) Power-Saving Shutdown Mode (1µA Maximum) Shutdown Input Fully Compatible with 1.8V Logic Systems
General Description
TC1240 TC1240A doubling CMOS charge pump voltage converters small 6-Pin SOT-23A package. TC1240 doubles input voltage which range from +2.5V +4.0V TC1240A doubles input voltage which range from +2.5V +5.5V. Conversion efficiency typically >99%. Internal oscillator frequency 160kHz both devices. TC1240 TC1240A have active high shutdown which limits current consumption devices less than 1µA. External component requirement only capacitors standard voltage doubler applications. other circuitry, including control, oscillator power MOSFETs, integrated on-chip. Typical supply current 180µA TC1240 550µA TC1240A. Both devices available 6-Pin SOT-23A surface mount package.
Applications
Cellular Phones Pagers PDAs, Portable Data Loggers Battery Powered Devices Handheld Instruments
Typical Application Circuit
Positive Voltage Doubler
CVIN INPUT
Device Selection Table
Part Number TC1240ECH TC1240AECH Package 6-Pin SOT-23A 6-Pin SOT-23A Temperature Range -40°C +85°C -40°C +85°C
TC1240 TC1240A
SHDN
VOUT
INPUT
Package Type
6-Pin SOT-23A
VOUT SHDN
TC1240ECH TC1240AECH
NOTE: 6-Pin SOT-23A equivalent EIAJ (SC-74A)
2002 Microchip Technology Inc.
DS21516B-page
TC1240/TC1240A
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*
Input Voltage (VIN GND) TC1240 +4.5V, -0.3V TC1240A +5.8V, -0.3V Output Voltage GND) TC1240 +9.0V, -0.3V TC1240A +11.6V, -0.3V Current VOUT Pin. 50mA Short-Circuit Duration: VOUT .Indefinite Thermal Resistance .210°C/W Power Dissipation +25°C).600mW Operating Temperature Range. -40°C +85°C Storage Temperature (Unbiased) -65°C +150°C
TC1240 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Typical values apply +25°C. Minimum maximum values apply -40° +85°C, +2.8V, 3.3µF, SHDN GND, unless otherwise specified. Symbol ISHDN VMIN VMAX FOSC PEFF VEFF ROUT
Note
Parameter Supply Current Shutdown Supply Current Minimum Supply Voltage Maximum Supply Voltage Oscillator Frequency Switching Frequency (Note Shutdown Input Logic High Shutdown Input Logic Power Efficiency Voltage Conversion Efficiency Output Resistance (Note
97.5
99.96
Units
Test Conditions RLOAD SHDN RLOAD 1.0K RLOAD 1.0K -40°C +85°C -40°C +85°C VMIN VMAX VMIN VMAX RLOAD 1.0K RLOAD RLOAD 1.0K -40°C +85°C
Switching frequency one-half internal oscillator frequency. Capacitor contribution approximately output impedance [ESR pump frequency capacitance].
DS21516B-page
2002 Microchip Technology Inc.
TC1240/TC1240A
TC1240A ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Typical values apply +25°C. Minimum maximum values apply -40° +85°C, +2.8V, 3.3µF, SHDN GND, unless otherwise specified. Symbol ISHDN VMIN VMAX ILOAD FOSC PEFF VEFF ROUT
Note
Parameter Supply Current Shutdown Supply Current Minimum Supply Voltage Maximum Supply Voltage Ouput Current DS(ON) Internal MOSFET Switches Oscillator Frequency Switching Frequency (Note Shutdown Input Logic High Shutdown Input Logic Power Efficiency Voltage Conversion Efficiency Output Resistance (Note
0.01 99.96
Units
Test Conditions RLOAD SHDN
ILOAD 20mA -40°C +85°C -40°C +85°C VMIN VMAX VMIN VMAX ILOAD RLOAD ILOAD 20mA -40°C +85°C
Switching frequency one-half internal oscillator frequency. Capacitor contribution approximately output impedance [ESR pump frequency capacitance].
2002 Microchip Technology Inc.
DS21516B-page
TC1240/TC1240A
DESCRIPTION
description pins listed Table 2-1.
TABLE 2-1:
FUNCTION TABLE
Symbol CSHDN VOUT Description Power supply input. Ground. Commutation capacitor negative terminal. Shutdown input (active high). Doubled output voltage. Commutation capacitor positive terminal.
(6-Pin SOT-23A)
DS21516B-page
2002 Microchip Technology Inc.
TC1240/TC1240A
DETAILED DESCRIPTION
TYPICAL APPLICATIONS
Output Voltage Considerations
TC1240 TC1240A charge pump converters double voltage applied pin. Conversion consists two-phase operation (Figure 3-1). During first phase, switches open closed. During this time, charges voltage load current supplied from During second phase, closed, open. During this second phase, level shifted upward volts. This connects reservoir capacitor allowing energy delivered output needed. actual voltage slightly lower than since four switches (S1-S4) have non-resistance load drains charge from reservoir capacitor
TC1240 TC1240A perform voltage doubling provide regulation. output voltage will droop linear manner with respect load current. value this equivalent output resistance approximately nominal +25°C +5.0V TC1240A nominal +25°C +2.8V TC1240. VOUT approximately +10.0V light loads TC1240A +5.6V TC1240, droops according equation below: VDROOP IOUT ROUT VOUT VDROOP
FIGURE 3-1: IDEAL SWITCHED CAPACITOR CHARGE PUMP DOUBLER
Charge Pump Efficiency
overall power efficiency charge pump affected four factors: Losses from power consumed internal oscillator, switch drive, etc. (which vary with input voltage, temperature oscillator frequency). losses on-resistance MOSFET switches on-board charge pump. Charge pump capacitor losses effective series resistance (ESR). Losses that occur during charge transfer (from commutation capacitor output capacitor) when voltage difference between capacitors exists.
TC1240/TC1240A
Most conversion losses factors above. These losses given Equation 4-1(b).
EQUATION 4-1:
LOSS(2, OUT2 IOUT2 [fFSW(C1) 8RSWITCH 4ESRC1 ESRC2]
2002 Microchip Technology Inc.
DS21516B-page
TC1240/TC1240A
pump frequency Equation 4-1(b) defined one-half oscillator frequency (i.e., fFSW FOSC/2). 1/(fFSW)(C1) term Equation 4-1(b) effective output resistance ideal switched capacitor circuit (Figure Figure 4-2). remaining losses circuit factor above, shown Equation 4-2. output voltage ripple given Equation 4-3.
Capacitor Selection
order maintain lowest output resistance output ripple voltage, recommended that capacitors used. Additionally, larger values will lower output resistance larger values will reduce output ripple. (See Equation 4-1(b)). Table shows various values corresponding output resistance values +25°C. assumes ESRC1 RSW. Table shows output voltage ripple various values VRIPPLE values assume output load current ESRC2.
EQUATION 4-2:
PLOSS(4) [(0.5)(C1)(VIN2 VOUT2) (0.5) (C2)(VRIPPLE2 2VOUT VRIPPLE)] fOSC
EQUATION 4-3:
VRIPPLE IOUT fOSC) (C2)] OUT) (ESRC2)
TABLE 4-1:
OUTPUT RESISTANCE (ESR 0.1)
TC1240 OUT() 28.5 19.5 15.5 13.6 12.5 12.2 TC1240A ROUT() 20.5 10.5
(µF)
FIGURE 4-1:
IDEAL SWITCHED CAPACITOR MODEL
0.47
VOUT
FIGURE 4-2:
REQUIV REQUIV
EQUIVALENT OUTPUT RESISTANCE
VOUT
TABLE 4-2:
OUTPUT VOLTAGE RIPPLE (ESR 0.1) IOUT
TC1240/TC1240A VRIPPLE (mV)
(µF) 0.47
DS21516B-page
2002 Microchip Technology Inc.
TC1240/TC1240A
Input Supply Bypassing Voltage Doubler
input should capacitively bypassed reduce impedance minimize noise effects switching internal device. recommended capacitor should large value least equal connected from input GND. most common application charge pump devices doubler (Figure 4-3). This application uses external capacitors (plus power supply bypass capacitor, necessary). output equal minus voltage drops loading. Refer Table Table capacitor selection.
Shutdown Input
TC1240 TC1240A disabled when SHDN high, enabled when SHDN low. This input cannot allowed float.
FIGURE 4-3:
TEST CIRCUIT
VOUT
TC1240 TC1240A
SHDN
Device TC1240/A
3.3µF
3.3µF
3.3µF
2002 Microchip Technology Inc.
DS21516B-page
TC1240/TC1240A
Cascading Devices Paralleling Devices
more TC1240s TC1240As cascaded increase output voltage (Figure 4-4). output lightly loaded, will close will droop least ROUT first device multiplied second. seen that output resistance rises rapidly multiple cascaded devices. case two-stage `tripler' output resistance approximated ROUT ROUT1 ROUT2, where ROUT1 output resistance first stage, ROUT2 output resistance second stage. reduce value ROUT, multiple TC1240s TC1240As connected parallel (Figure 4-5). output resistance will reduced factor where number TC1240s TC1240As. Each device will require pump capacitor (C1x), devices share reservoir capacitor (C2). However, preserve ripple performance value should scaled according number paralled TC1240s TC1240As, respectively.
Layout Considerations
with switching power supply circuit good layout practice recommended. Mount components close together possible minimize stray inductance capacitance. Also large ground plane minimize noise leakage into other circuitry.
FIGURE 4-4:
CASCADING MULTIPLE DEVICES INCREASE OUTPUT VOLTAGE
TC1240 TC1240A
SHDN
TC1240 TC1240A
VOUT
SHDN
VOUT 1)VIN
FIGURE 4-5:
PARALLELING MULTIPLE DEVICES REDUCE OUTPUT RESISTANCE
ROUT ROUT SINGLE DEVICE NUMBER DEVICES SHDN
TC1240 TC1240A
TC1240 TC1240A
VOUT
SHDN
VOUT
Shutdown Control
DS21516B-page
2002 Microchip Technology Inc.
TC1240/TC1240A
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.
Supply Current Supply Voltage Load)
Supply Current Temperature Load)
SUPPLY CURRENT (µA) 2.8V 4.0V
SUPPLY CURRENT (µA)
2.00 3.00 4.00 SUPPLY VOLTAGE 5.00 6.00
TEMPERATURE (°C)
Output Source Resistance Supply Voltage (with RLOAD
OUTPUT SOURCE RESISTANCE
OUTPUT SOURCE RESISTANCE
Output Source Resistance Temperature (with RLOAD
4.0V 2.8V
2.00 3.00 4.00 SUPPLY VOLTAGE 5.00 6.00
TEMPERATURE (°C)
Output Voltage Drop Load Current
POWER EFFICIENCY 100%
Power Efficiency Load Current
VOLT DROP LOAD CURRENT (mA) 2.8V 4.0V
2.5V 3.5V 4.0V
LOAD CURRENT (mA)
2002 Microchip Technology Inc.
DS21516B-page
TC1240/TC1240A
TYPICAL CHARACTERISTICS (CONTINUED)
Switching Frequency Temperature
SWITCHING FREQUENCY (kHz) 2.8V 4.0V
TEMPERATURE (°C)
DS21516B-page
2002 Microchip Technology Inc.
TC1240/TC1240A
PACKAGING INFORMATION
Package Marking Information
part number code temperature range (two-digit code)
Code
TC1240/TC1240A TC1240ECH TC1240AECH 1240AECH
represents year 2-month code represents production code
Taping Form
Component Taping Orientation 6-Pin SOT-23A (EIAJ SC-74) Devices
User Direction Feed
Device Device Device Device Device Device Marking Marking Marking Marking Marking Marking
Standard Reel Component Orientation Suffix Device (Mark Right Side
Carrier Tape, Number Components Reel Reel Size
Package Carrier Width Pitch Part Full Reel Reel Size
6-Pin SOT-23A
3000
2002 Microchip Technology Inc.
DS21516B-page
TC1240/TC1240A
Package Dimensions
SOT-23A-6
.075 (1.90) REF.
.122 (3.10) .098 (2.50) .020 (0.50) .014 (0.35)
.069 (1.75) .059 (1.50)
.037 (0.95) REF. .118 (3.00) .110 (2.80)
.057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00)
MAX. .024 (0.60) .004 (0.10)
.008 (0.20) .004 (0.09)
Dimensions: inches (mm)
DS21516B-page
2002 Microchip Technology Inc.
TC1240/TC1240A
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.
DS21516B-page13
TC1240/TC1240A
NOTES:
DS21516B-page14
2002 Microchip Technology Inc.
TC1027
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2002 Microchip Technology Inc.
DS21284B-page
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DS21516B-page
2002 Microchip Technology Inc.
*B61512SD*
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