TC1240 TELCOM | Alldatasheet

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Positive Doubling Charge Pump with Shutdown in SOT Package TC1240-1 7/7/00 Positive Doubling Charge Pump with Shutdown in SOT Package GENERAL DESCRIPTION The TC1240 is a doubling CMOS charge-pump voltage converter in a small 6-Pin SOT-23A package. TC1240 doubles an input voltage which can range from +2.5V to +4.0V. Conversion efficiency is typically >99%. Internal oscillator frequency is 160kHz for the TC1240. The TC1240 has an active high shutdown which limits the current con- sumption of the device to less than 1µA. External component requirement is only two capacitors for standard voltage doubler applications. All other circuitry, including control, oscillator, power MOSFETs are integrated on-chip. Typical supply current is 180µA and the device is available in a 6-Pin SOT-23A surface mount package.

FEATURES

I Space Saving 6-Pin SOT-23A Package I >99% Typical Voltage Conversion Efficiency I Voltage Doubling I Operates from +2.5V to +4.0V I Low Output Resistance (17Ω Typical) I Only Two External Capacitors Required I Consumes 180 µA (Typical) in Active Mode I Power-Saving Shutdown Mode (1µA Maximum) I Fully Compliant with 1.8V Logic Sytems

APPLICATIONS

I PDAs, Portable Dataloggers I Battery-Powered Devices I Handheld Instruments

ORDERING INFORMATION

Number Package Temp. Range TC1240ECH 6-Pin SOT-23A –40°C to +85°C TC1240 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices. TYPICAL OPERATING CIRCUIT PIN CONFIGURATION Positive Voltage Doubler TC1240 VIN 2 x INPUT C + C – C 2 INPUT GND OUT SHDN OFF ON 6-Pin SOT-23A C + C – GND TC1240ECH 6VIN OUT SHDN NOTE: *6-Pin SOT-23A is equivalent to EIAJ SC-74

Positive Doubling Charge Pump with Shutdown in SOT Package ABSOLUTE MAXIMUM RATINGS* Power Dissipation (T A ≤ 70°C) *Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. These are stress ratings 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 to +85 °C, VIN = +2.8V, C1 = C2 = 3.3µF , SHDN = GND, unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Test Conditions Min Typ Max Units IDD Supply Current R LOAD = ∞ — 180 300 µA ISHDN Shutdown Supply Current SHDN = V IN — 0.1 1.0 µA VMIN Minimum Supply Voltage R LOAD = 1.0KΩ 2.5 — — V VMAX Maximum Supply Voltage R LOAD = 1.0KΩ — — 4.0 V FOSC Oscillator Frequency T A = –40 °C to +85°C — 160 — kHz FSW Switching Frequency T A = –40 °C to +85°C 40 80 125 kHz VIH Shutdown Input Logic High V IN = VMIN to VMAX 1.4 — — V VIL Shutdown Input Logic Low V IN = VMIN to VMAX — — 0.4 V PEFF Power Efficiency R LOAD = 1.0KΩ 86 93 — % VEFF Voltage Conversion R LOAD = ∞ 97.5 99.96 — % Efficiency R OUT Output Resistance R LOAD = 1.0KΩ —1 7— Ω (Note 1) T A = –40°C to +85°C— — 3 0 NOTE: 1. Capacitor contribution is approximately 26% of the output impedance [ESR = 1 / pump frequency x capacitance)]. 2. Switching frequency is one-half internal oscillator frequency. PIN DESCRIPTION Pin No. (6-Pin SOT-23A) Symbol Description 1 V IN Power Supply Input. 2 GND Ground. 3 C – Commutation Capacitor Negative Terminal. 4 SHDN Shutdown Input (Active High). 5 OUT Doubled Output Voltage. 6 C+ Commutation Capacitor Positive Terminal.

Positive Doubling Charge Pump with Shutdown in SOT Package TC1240-1 7/7/00 TYPICAL CHARACTERISTICS Supply Current vs. Supply Voltage (No Load) 100 200 300 400 500 600 700 Supply Voltage (V) Supply Current vs. Temperature (No Load) 100 150 200 250 300 350 400 450 -50 -25 0 25 50 75 100 125 Temperature (°C) Output Source Resistance vs. Supply Voltage (with Rload = 1K) Supply Voltage (V) Output Source Resistance vs. Temperature (with Rload = 1K) -50 -25 0 25 50 75 100 125 Temperature (°C) Output Voltage Drop Vs Load Current 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0 5 10 15 20 25 30 35 40 45 50 Load Current (mA) Power Efficiency Vs Load Current 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 5 10 15 20 25 30 35 40 45 50 Load Current (mA) VIN = 4.0V VIN = 2.8V VIN = 2.8V VIN = 4.0V VIN = 2.8V VIN = 4.0V VIN = 2.5V VIN = 4.0V VIN = 3.5V

Positive Doubling Charge Pump with Shutdown in SOT Package TAPING FORM User Direction of Feed User Direction of Feed Device Marking Component Taping Orientation for 6-Pin SOT-23A (EIAJ SC-74) Devices Device Marking PIN 1 PIN 1 Standard Reel Component Orientation For TR Suffix Device (Mark Right Side Up) Reverse Reel Component Orientation For RT Suffix Device (Mark Upside Down) W P Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 6-Pin SOT-23A 8 mm 4 mm 3000 7 in Carrier Tape, Number of Components Per Reel and Reel Size /L54706 & /L54707 represent part number code + temperature range (two-digit code) TC1240 Code 1240ECH DN Ex: 1240ECH = /L54708represents year and 2-month code /L54709represents lot ID number MARKING 6-Pin SOT-23A Switching Frequency vs. Temperature 100 -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) V IN = 2.8VV IN = 4.0V SWITCHING FREQUENCY (KHz) TYPICAL CHARACTERISTICS (Cont.) D N

Positive Doubling Charge Pump with Shutdown in SOT Package TC1240-1 7/7/00 Sales Offices 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) 6-Pin SOT-23A (EIAJ SC-74) .069 (1.75) .059 (1.50) .122 (3.10) .098 (2.50) .075 (1.90) REF. .020 (0.50) REF. .118 (3.00) .110 (2.80) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00) .024 (0.60) .004 (0.10) .004 (0.09)