TCM828 MICROCHIP | Alldatasheet
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Technical content
© 2001 Microchip Technology Inc. DS21488A Switched Capacitor Voltage Converters
FEATURES
I Charge Pump in 5-Pin SOT-23A Package I >95% Voltage Conversion Efficiency I Voltage Inversion and/or Doubling I Low 50µA (TCM828) Quiescent Current I Operates from +1.5V to +5.5V I Up to 25mA Output Current I Only Two External Capacitors Required
APPLICATIONS
I PDAs, Portable Dataloggers I Battery-Powered Devices GENERAL DESCRIPTION The TCM828/829 are CMOS “charge-pump” voltage converters in ultra-small 5-Pin SOT-23A packages. They invert and/or double an input voltage which can range from +1.5V to +5.5V. Conversion efficiency is typically >95%. Switching frequency is 12kHz for the TCM828 and 35kHz for the TCM829. External component requirement is only two capacitors (3.3µF nominal) for standard voltage inverter applications. With a few additional components a positive doubler can also be built. All other circuitry, including control, oscillator, power MOSFETs are integrated on-chip. Supply current is 50µA (TCM828) and 115µA (TCM829). The TCM828 and TCM829 are available in a 5-Pin SOT-23A surface mount package. TYPICAL OPERATING CIRCUIT
ORDERING INFORMATION
Part No. Package Temp. Range TCM828ECT 5-Pin SOT-23A – 40 °C to +85°C TCM829ECT 5-Pin SOT-23A – 40 °C to +85°C NOTE: 5-Pin SOT-23A is equivalent to EIAJ SC-74A. PIN CONFIGURATION TCM828 TCM829 VIN OUTPUT C + C – C 1 C 2 INPUT GND OUT C + C – OUT TCM828ECT TCM829ECT GND VIN *5-Pin SOT-23A NOTE: *5-Pin SOT-23A is equivalent to EIAJ SC-74A Voltage Inverter
© 2001 Microchip Technology Inc. DS21488A ABSOLUTE MAXIMUM RATINGS* Power Dissipation (T A ≤ 70°C) *This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: TA = 0°C to +85°C, VIN = +5V, C1 = C2 = 10µF (TCM828), C1 = C2 = 3.3µF (TCM829), unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Device Test Conditions Min Typ Max Unit IDD Supply Current TCM828 T A = +25°C — 50 90 µA TCM829 — 115 260 V+ Minimum Supply R LOAD = 10kΩ : TA = 0°C to +85°C 1.5 — — V Voltage V+ Maximum Supply R LOAD = 10kΩ — — 5.5 V Voltage FOSC Oscillator Frequency TCM828 T A = +25°C 8.4 12 15.6 kHz TCM829 24.5 35 45.5 PEFF Power Efficiency I LOAD = 3mA, TA = +25°C— 9 6 — % VEFF Voltage Conversion R LOAD = ∞ 95 99.9 — % Efficiency R OUT Output Resistance I OUT = 5mA, TA = 25°C — 25 50 Ω TA = 0°C to +85°C— — 6 5 ELECTRICAL CHARACTERISTICS: TA = – 40°C to +85°C, VIN = +5V, C1 = C2 = 10µF (TCM828), C1 = C2 = 3.3µF (TCM829) unless otherwise noted. Typical values are at TA = +25°C. (Note 2) Symbol Parameter Device Test Conditions Min Typ Max Unit IDD Supply Current TCM828 — — 115 µA TCM829 — — 325 V+ Supply Voltage Range R LOAD = 10kΩ 1.5 — 5.5 V FOSC Oscillator Frequency TCM828 6 — 20 kHz TCM829 19 — 54.3 R OUT Output Resistance I OUT = 5mA — — 65 Ω PIN DESCRIPTION Pin No. (5-Pin SOT-23A) Symbol Description 1 OUT Inverting charge pump output. 2V IN Positive power supply input. 3C –1 Commutation capacitor negative terminal. 4 GND Ground. 5C 1 + Commutation capacitor positive terminal. NOTE: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1 / pump frequency x capacitance)]. NOTE: 2. All – 40°C to +85°C specifications above are guaranteed by design.
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across C2, restoring charge to C2. age, temperature and oscillator frequency). switches on-board the charge pump. Figure 1. Ideal Switched Capacitor Charge Pump and (4) above. These losses are given by Equation 1.
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ing a Schottky diode (1N5817) as shown in Figure 7. noise leakage into other circuitry. Figure 6. Combined Doubler and Inverter Figure 7. High V– Load Current Figure 5. Paralleling TCM828s or TCM829s to Reduce Output Resistance
© 2001 Microchip Technology Inc. DS21488A TYPICAL CHARACTERISTICS Circuit of Figure 3, VIN = +5V, C1 = C2 = C3, TA = +25°C, unless otherwise noted. 1.5 2.5 3.5 4.5 SUPPLY VOLTAGE (V) Output Resistance vs. Supply Voltage OUTPUT RESISTANCE ( Ω ) 0 10 20 30 40 CAPACITANCE ( µF) TCM828 Output Current vs. Capacitance OUTPUT CURRENT (mA) –40°C 0°C 25°C8 5 °C TEMPERATURE ( °C) Output Resistance vs. Temperature 80OUTPUT RESISTANCE ( Ω ) VIN = 1.5V VIN = 4.75V, VOUT = – 4.0V VIN = 3.15V, VOUT = – 2.5V VIN = 1.9V, VOUT = –1.5V VIN = 3.3V VIN = 5.0V 0 105 15 20 25 3530 CAPACITANCE (µF) TCM829 Output Current vs. Capacitance 40OUTPUT CURRENT (mA) 0 1051 5 2 0 30 35 CAPACITANCE ( µF) TCM829 Output Voltage Ripple vs. Capacitance 450 300 250 200 150 100 400 350 300 250 200 150 100 0 1052 5 20 25 30 35 CAPACITANCE ( µF) TCM828 Output Voltage Ripple vs. Capacitance OUTPUT VOLTAGE RIPPLE (mVp-p) OUTPUT VOLTAGE RIPPLE (mVp-p) –40 0°C2 5 °C8 5 °C –40°C0 °C2 5 °C8 5 °C TEMPERATURE ( °C) TCM828 Pump Frequency vs. Temperature PUMP FREQUENCY (kHz) 100 SUPPLY VOLTAGE (V) Supply Current vs. Supply Voltage 120SUPPLY CURRENT ( µA) TCM829 TCM828 TEMPERATURE ( °C) TCM829 Pump Frequency vs. Temperature PUMP FREQUENCY (kHz) TCM829TCM828 VIN = 4.75V, V– = – 4.0V VIN = 1.9V, VOUT = – 1.5V VIN = 3.15V, V– = – 2.5V VIN = 4.75V, VOUT = – 4.0V VIN = 3.15V, VOUT = – 2.5V VIN = 1.9V, VOUT = – 1.5V VIN = 4.75V, VOUT = – 4.0V VIN = 3.15V, VOUT = – 2.5V VIN = 1.9V, VOUT = – 1.5V VIN = 5.0V VIN = 5.0V VIN = 3.3V VIN = 3.3V VIN = 1.5V VIN = 1.5V
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© 2001 Microchip Technology Inc. DS21488A TYPICAL CHARACTERISTICS (Cont.) Circuit of Figure 3, VIN = +5V, C1 = C2 = C3, TA = +25°C, unless otherwise noted. 100 0 10 20 30 40 50 OUTPUT CURRENT (mA) Efficiency vs. Output Current EFFICIENCY (%) 02 0 3010 40 50 OUTPUT CURRENT (mA) Output Voltage vs. Output Current OUTPUT VOLTAGE ( V) VIN = 2.0V VIN = 3.3V VIN = 5.0V VIN = 5.0V VIN = 3.3V VIN =1.5V 5-PIN SOT-23A MARKING Part Numbers and Part Marking /L54706 & /L54707 = part number code + temperature range (two-digit code). TCM828/829 Code TCM828ECT CA TCM829ECT CB ex: TCM828ECT = /L50107/L50107/L50107/L50107 /L54708represents year and quarter code /L54709represents lot ID number CA
© 2001 Microchip Technology Inc. DS21488A Dimensions: inches (mm) PACKAGE DIMENSIONS TAPING FORM User Direction of Feed User Direction of Feed Device Marking Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices Device Marking PIN 1 PIN 1 Standard Reel Component Orientation TR Suffix Device (Mark Right Side Up) Reverse Reel Component Orientation RT Suffix Device (Mark Upside Down) W P Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 5-Pin SOT-23A 8 mm 4 mm 3000 7 in Carrier Tape, Number of Components Per Reel and Reel Size 5-Pin SOT-23A (EIAJ SC-74A) .071 (1.80) .059 (1.50) .122 (3.10) .098 (2.50) .075 (1.90) REF. .020 (0.50) .012 (0.30) PIN 1 .037 (0.95) REF. .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00) .024 (0.60) .004 (0.10) .004 (0.09)
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© 2001 Microchip Technology Inc. DS21488A Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchipís products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec- reserved. All other trademarks mentioned herein are the property of their respective companies. All rights reserved. © 2001 Microchip Technology Incorporated. Printed in the USA. 1/01 Printed on recycled paper. AMERICAS Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 Atlanta
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