TC828A

TC828A TELCOM | Alldatasheet

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Technical content

TC828A-1 5/1/00 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices. TC828A Switched Capacitor Voltage Converter

FEATURES

I Charge Pump in 5-Pin SOT-23A Package I >95% Voltage Conversion Efficiency I Voltage Inversion and/or Doubling I Low 38µA Quiescent Current I Operates from +1.8V to +5.5V I Up to 25mA Output Current I Only Two External Capacitors Required I Lower Power Version of TCM828

APPLICATIONS

I LCD Panel Bias I Cellular Phones I Pagers I PDAs, Portable Dataloggers I Battery-Powered Devices GENERAL DESCRIPTION The TC828A is a CMOS “charge-pump” voltage con- verter in an ultra-small 5-Pin SOT-23A package. It can invert and/or double an input voltage that can range from +1.8V to +5.5V. Conversion efficiency is typically >95%, and switch- ing frequency is 12KHz. The external component requirement is only two ca- pacitors (10µF nominal) for standard voltage inverter appli- cations. 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 38µA typically. The TC828A is available in a 5-Pin SOT-23A surface mount package. TYPICAL OPERATING CIRCUIT

ORDERING INFORMATION

Part No. Package Temp. Range TC828AECT 5-Pin SOT-23A – 40°C to +85°C NOTE: 5-Pin SOT-23A is equivalent to EIAJ-SC74A. PIN CONFIGURATION 5-Pin SOT-23A NOTE: *5-Pin SOT-23A is equivalent to EIAJ SC-74A Voltage Inverter TC828A VIN OUTPUT INPUT GND OUT OUT TC828ECT GND VIN

ABSOLUTE MAXIMUM RATINGS* Power Dissipation (TA ≤ 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 = –40°C to +85°C, VIN = +5V, C1 = C2 = 10 µF, unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Test Conditions Min Typ Max Unit IDD Supply Current µA Minimum Supply RLOAD = 1 KΩ 1.8 V Voltage Maximum Supply RLOAD = 1 KΩ 5.5 V Voltage FOSC Oscillator Frequency KHz PEFF Power Efficiency RLOAD = 1 KΩ, TA = +25°C VEFF Voltage Conversion RLOAD = ∞ 99.9 Efficiency ROUT Output Resistance IOUT = 5 mA, TA = +25°C Ω TA = –40°C to +85°C PIN DESCRIPTION Pin No. (5-Pin SOT-23A) Symbol

Description

Inverting charge pump output. VIN Positive power supply input. C–1 Commutation capacitor negative terminal. GND Ground. Commutation capacitor positive terminal. NOTE: 1. Capacitor contribution is approximately 20% of the output impedance [ESR = 1 / pump frequency x capacitance)]. 2. All – 40°C to +85°C specifications above are guaranteed by design.

Circuit of Figure 3, VIN = +5V, C1 = C2 = C3, TA = +25°C, unless otherwise noted. 1.5 2.5 3.5 4.5 5.5 SUPPLY VOLTAGE (V) Supply Current vs. Supply Voltage SUPPLY CURRENT (µA) 1.5 2.5 3.5 4.5 5.5 SUPPLY VOLTAGE (V) Output Resistance vs. Supply Voltage OUTPUT RESISTANCE (Ω) –40 –20 TEMPERATURE (°C) Output Resistance vs. Temperature OUTPUT RESISTANCE (Ω) VIN = 1.8V VIN = 3.3V VIN = 5.0V Output Current vs. Capacitance CAPACITANCE (µF) OUTPUT CURRENT (mA) 35 40 45 50 VIN = 1.9V, VOUT = –1.5V VIN = 4.75V, VOUT = – 4.0V VIN = 3.15V, VOUT = – 2.5V 450 400 350 300 250 200 150 100 CAPACITANCE (µF) Output Voltage Ripple vs. Capacitance 500 OUTPUT VOLTAGE RIPPLE (mVp-p) VIN = 4.75V, VOUT = – 4.0V VIN = 3.15V, VOUT = – 2.5V VIN = 1.9V, VOUT = – 1.5V –40 –20 TEMPERATURE (°C) Pump Frequency vs. Temperature PUMP FREQUENCY (kHz) VIN = 5.0V VIN = 1.5V VIN = 3.3V

TYPICAL CHARACTERISTICS (Cont.) Circuit of Figure 3, VIN = +5V, C1 = C2 = C3, TA = +25°C, unless otherwise noted. 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 –0.5 –1.5 –2.5 –4.5 –5.5 –3.5 30 35 40 45 50 OUTPUT CURRENT (mA) Output Voltage vs. Output Current 0.5 OUTPUT VOLTAGE (V) VIN = 2.0V VIN = 3.3V VIN = 5.0V 30 35 40 45 50 OUTPUT CURRENT (mA) Efficiency vs. Output Current 100 EFFICIENCY (%) VIN = 5.0V VIN = 2.0V VIN = 3.3V

TelCom Semiconductor, Inc.

1300 Terra Bella Avenue

P.O. Box 7267 Mountain View, CA 94039-7267 TEL: 650-968-9241 FAX: 650-967-1590 E-Mail: liter@telcom-semi.com TelCom Semiconductor, GmbH Lochhamer Strasse 13 D-82152 Martinsried Germany TEL: (011) 49 89 895 6500 FAX: (011) 49 89 895 6502 2 TelCom Semiconductor H.K. Ltd.

10 Sam Chuk Street, Ground Floor

San Po Kong, Kowloon Hong Kong TEL: (011) 852-2350-7380 FAX: (011) 852-2354-9957 PACKAGE DIMENSIONS Dimensions: inches (mm) SOT-23A-5 MARKING Part Numbers and Part Marking & = part number code + temperature range (two-digit code). TC828A Code TC828AECT CC ex: 828ECT = represents year and 2-month code represents lot ID number C C 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) 10° MAX. .010 (0.25) .004 (0.09)