Positive Doubling Charge Pump with Shutdown SOT-23 Package Charge

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Positive Doubling Charge Pump with Shutdown SOT-23 Package Charge

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TC1240 TC1240A
Positive Doubling Charge Pump with Shutdown SOT-23 Package
Charge Pump 6-Pin SOT-23A Package >99% Typical Voltage Conversion Efficiency Voltage Doubling Operates from +2.5V +5.5V Output Resistance Typical) Only External Capacitors Required Consumes 550µA (Typical) Active Mode Power-Saving Shutdown Mode (1µA Maximum) Shutdown Input Fully Compatible with 1.8V Logic Sytems
GENERAL DESCRIPTION
TC1240A doubling CMOS charge-pump voltage converter small 6-Pin SOT-23A package. TC1240A doubles input voltage which range from +2.5V +5.5V. Conversion efficiency typically >99%. Internal oscillator frequency 160kHz TC1240A. TC1240A active high shutdown which limits current consumption device 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 device available 6-Pin SOT-23A surface mount package.
APPLICATIONS
Cellular Phones Pagers PDAs, Portable Data Loggers Battery-Powered Devices Handheld Instruments
ORDERING INFORMATION
Part Number TC1240AECH Package 6-Pin SOT-23A Temp. Range -40°C +85°C
TYPICAL OPERATING CIRCUIT
CONFIGURATION
Positive Voltage Doubler
6-Pin SOT-23A
SHDN TC1240A
INPUT
TC1240AECH
INPUT
SHDN
NOTE: *6-Pin SOT-23A equivalent EIAJ SC-74
2001 Microchip Technology Inc.
DS21516A
TC1240-1 7/7/00
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (VIN GND) +5.8V, -0.3V Output Voltage (OUT GND) +11.6V, 0.3V Current Short-Circuit Duration -OUT Indefinite Operating Temperature Range .-40 +85°C Thermal Resistance.210°C/W Power Dissipation +25°C) .600mW Storage Temperature (Unbiased) +150°C Lead Temperature (Soldering, sec) +300°C
*Static-sensitive device. Unused devices must stored conductive material. Protect devices from static discharge static fields. 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 operational sections specifications implied. Exposure Absolute Maximum Rating Conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS: +5.0V, 3.3µF SHDN GND,
unless otherwise noted. Typical values +25°C.
Symbol ISHDN VMIN VMAX ILOAD FOSC PEFF VEFF ROUT Parameter Supply Current Shutdown Supply Current Minimum Supply Voltage Maximum Supply Voltage Output Current RDS(ON) Internal MOSFET Switches Oscillator Frequency Switching Frequency Shutdown Input Logic High Shutdown Input Logic Power Efficiency Voltage Conversion Efficiency Output Resistance (Note ILOAD 20mA +85°C +85°C VMIN VMAX VMIN VMAX ILOAD RLOAD ILOAD 20mA -40°C +85°C Test Conditions RLOAD SHDN 0.01 99.96 Units
NOTE: Capacitor contribution approximately output impedance [ESR pump frequency capacitance)]. Switching frequency one-half internal oscillator frequency.
DESCRIPTION
(6-Pin SOT-23A) Symbol SHDN Description Power Supply Input. Ground. Commutation Capacitor Negative Terminal. Shutdown Input (Active High). Doubled Output Voltage. Commutation Capacitor Positive Terminal.
TC1240A-2 11/27/00
2001 Microchip Technology Inc.
DS21516A
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
DETAILED DESCRIPTION
TC1240A charge pump converter doubles voltage applied pin. Conversion consists twophase operation (Figure 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 have on-resistance load drains charge from reservoir capacitor
TC1240A
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. Most conversion losses factors above. These losses given Equation 1(b). PLOSS IOUT ROUT IOUT2
PUMP)
+8RSWITCH 4ESRC1 ESRC2
Equation
pump frequency Equation 1(b) defined onehalf oscillator frequency (i.e. fPUMP fOSC/2). 1/(fPUMP)(C1) term Equation 1(b) effective output resistance ideal switched capacitor circuit (Figures 2b). remaining losses circuit factor above, shown Equation output voltage ripple given Equation PLOSS(4) [(0.5)(C1) (4VIN2- VOUT2 (0.5)(C2)(2VOUT VRIPPLE VRIPPLE2 fOSC
Equation
Figure Ideal Swiched Capacitor Charge Pump Doubler
VRIPPLE IOUT +2(IOUT)(ESRC2) (fOSC)(C2)
Equation
APPLICATIONS INFORMATION Output Voltage Considerations
TheTC1240A performs voltage doubling does provide regulation. output voltage will droop linear manner with respect load current. value this equivalent output resistance approximately nominal +25°C +5.0V. VOUT approximately +10.0V light loads, droops according equation below: VDROOP IOUT ROUT VOUT VDROOP
VOUT
Figure Ideal Swiched Capacitor Model
REQUIV REQUIV
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).
2001 Microchip Technology Inc. DS21516A
VOUT
Figure Equivalent Output Resistance
TC1240A-2 11/27/00
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
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 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. Table Output Resistance (ESR 0.1)
(µF) 0.47 TC1240A ROUT() 20.5 10.5
VOUT TC1240A TC1240 SHDN
Device TC1240A TC1240
3.3µF
3.3µF
3.3µF
Voltage Doubler
Figure Test Circuit
VOLTAGE DOUBLER
most common application charge pump devices doubler (Figure This application uses external capacitors (plus power supply bypass capacitor, necessary). output equal minus voltage drops loading. Refer Table Table capacitor selection.
Table Output Voltage Ripple (ESR 0.1) IOUT
(µF) 0.47 TC1240A VRIPPLE (mV)
TC1240A
TC1240A
SHDN
SHDN
VOUT
VOUT 1)VIN
Figure Cascading Multiple Devies Increase Output Voltage
INPUT SUPPLY BYPASSING
input should capacitively bypassed reduce impedance minimize noise effects switching internal device. recommended capacitor should large value least equal connected from input GND.
CASCADING DEVICES
more TC1240As cascaded increase output voltage (Figure output lightly loaded, will close VIN) 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.
2001 Microchip Technology Inc. DS21516A
SHUTDOWN INPUT
TheTC1240A disabled when SHDN high, enabled when SHDN low. This input cannot allowed float.
TC1240A-2 11/27/00
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
ROUT ROUT SINGLE DEVICE NUMBER DEVICES TC1240A TC1240A SHDN VOUT
However, preserve ripple performance value should scaled according number paralleled TC1240As.
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.
SHDN
VOUT
Shutdown Control
TC1240 DEMO CARD
TC1240A Demo Card 1.25" 1.0" card containing TC1240A necessary external components that allow user evaluate device's ability generate non-regulated output voltage. demo card fully assembled with required external capacitors along with variable load resistor that allows user vary output load current output stage. convenience, several test points jumpers available measuring various voltages currents circuit board.
Figure Paralleling Multiple Devices Reduce Output Resistance
PARALLELING DEVICES
reduce value ROUT, multiple TC1240As connected parallel (Figure output resistance will reduced factor where number TC1240As. Each device will require pump capacitor (C1x), devices share resevoir capacitor (C2).
Figure TC1240A Demo Card Schematic
2001 Microchip Technology Inc. DS21516A
TC1240A-2 11/27/00
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
Figure TC1240A Demo Card Assembly Drawing Artwork
Figure schematic TC1240A Demo Card, Figure shows assembly drawing artwork board. Table lists voltages that monitored test points Table lists currents that measured using jumpers specific jumper function.
Table TC1240A Demo Card Test Points TEST POINT VOLTAGE MEASUREMENT DEMO CARD POWER SUPPLY INPUT[+2.5V +5.5V] GROUND GROUND TC1240A OUTPUT VIN) TC1240A SHDN INPUT TC1240A SUPPLY VOLTAGE EXTERNAL SHDN INPUT
Table TC1240A Demo Card Jumpers JUMPER CURRENT MEASUREMENT JUMPER FUNCTION TC1240A QUIESCENT CURRENT TC1240A LOAD CURRENT TC1240A SHDN INPUT CURRENT CONNECT EXTERNAL SHDN INPUT (i.e. SHDN ENABLE)
TC1240A-2 11/27/00
2001 Microchip Technology Inc.
DS21516A
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
TYPICAL CHARACTERISTICS
2.00
Supply Current Supply Voltage Load)
3.00
4.00
5.00
6.00
Supply Voltage
Supply Current Temperature Load)
4.0V
2.8V
Temperature
Output Source Resistance Supply Voltage (with Rload 2.00
Output Source Resistance Temperature (with Rload
2.8V
4.0V
3.00
4.00 Supply Voltage
5.00
6.00
Temperature
Output Voltage Drop Load Current
100%
Power Efficiency Load Current
4.5V 2.5V 3.5V
2.8V 4.0V
Load Current (mA)
TC1240A-2 11/27/00
Load Current (mA)
2001 Microchip Technology Inc.
DS21516A
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
TYPICAL CHARACTERISTICS (Cont.)
SWITCHING FREQUENCY (KHz)
MARKING 6-Pin SOT-23A
Switching Frequency Temperature
4.0V 2.8V
represent part number code temperature range (two-digit code) TC1240A 1240AECH 1240AECH Code
TEMPERATURE
represents year 2-month code represents number
TAPING FORM
Component Taping Orientation 6-Pin SOT-23A (EIAJ SC-74) Devices
User Direction Feed
Device Marking Device Marking
User Direction Feed
Standard Reel Component Orientation Suffix Device (Mark Right Side
Reverse Reel Component Orientation Suffix Device (Mark Upside Down)
Carrier Tape, Number Components Reel Reel Size
Package Carrier Width Pitch Part Full Reel Reel Size
6-Pin SOT-23A
3000
TC1240A-2 11/27/00
2001 Microchip Technology Inc.
DS21516A
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
PACKAGE DIMENSIONS
6-Pin SOT-23A (EIAJ SC-74)
.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)
2001 Microchip Technology Inc.
DS21516A
TC1240A-2 11/27/00
Positive Doubling Charge Pump with Shutdown SOT-23 Package TC1240A
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rights reserved. 2001 Microchip Technology Incorporated. Printed USA. 1/01
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. products critical components life support systems authorized except with express written approval Microchip. licenses conveyed, implicitly otherwise, except maybe explicitly expressed herein, under intellectual property rights. Microchip logo name registered trademarks Microchip Technology Inc. U.S.A. other countries. rights reserved. other trademarks mentioned herein property their respective companies.
TC1240A-2 11/27/00
2001 Microchip Technology Inc.
DS21516A

Positive Doubling Charge Pump with Shutdown SOT-23 Package Charge

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