TC7660 TELCOM | Alldatasheet

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Technical content

4-51TELCOM SEMICONDUCTOR, INC. TC7660 CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER

FEATURES

n Converts +5V Logic Supply to ±5V System n Low Cost and Easy to Use — Only Two External Capacitors Required n RS232 Negative Power Supply n Available in Small Outline (SO) Package n No Dx Diode Required for High Voltage Operation GENERAL DESCRIPTION The TC7660 is a pin-compatible replacement for the Industry standard TC7660 charge pump voltage converter. It converts a +1.5V to +10V input to a corresponding – 1.5V to – 10V output using only two low-cost capacitors, eliminat- ing inductors and their associated cost, size and EMI. The on-board oscillator operates at a nominal fre- quency of 10kHz. Operation below 10kHz (for lower supply current applications) is possible by connecting an external capacitor from OSC to ground (with pin 1 open). The TC7660 is available in both 8-pin DIP and 8-pin SOIC packages in commercial and extended temperature ranges.

ORDERING INFORMATION

Part No. Package Range TC7660COA 8-Pin SOIC 0 °C to +70°C TC7660CPA 8-Pin Plastic DIP 0 °C to +70°C TC7660EOA 8-Pin SOIC – 40 °C to +85°C TC7660EPA 8-Pin Plastic DIP – 40 °C to +85°C TC7660IJA 8-Pin CerDIP – 40 °C to +85°C TC7660MJA 8-Pin CerDIP – 55 °C to +125°C TC7660EV Evaluation Kit for Charge Pump Family FUNCTIONAL BLOCK DIAGRAM TC7660CPA TC7660EPA TC7660IJA NC CAP + GND CAP – NC CAP + GND CAP –VOUT LOW VOLTAGE (LV) OSC VOUT LOW VOLTAGE (LV) OSC NC = NO INTERNAL CONNECTION TC7660COA TC7660CPA TC7660 GND INTERNAL VOLTAGE REGULATOR RC OSCILLATOR VOLTAGE– LEVEL TRANSLATOR ÷ 2 V + CAP + OSC LV LOGIC NETWORK VOUT CAP –4 PIN CONFIGURATION (DIP and SOIC) TC7660-7 9/30/96 EVALUATION KIT AVAILABLE

4-52 TELCOM SEMICONDUCTOR, INC. TC7660 CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER ABSOLUTE MAXIMUM RATINGS* LV and OSC Inputs for V+ < 5.5V for V+ > 5.5V Power Dissipation (TA ≤ 70°C) (Note 2) Operating Temperature Range *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 operation sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: Specifications Measured Over Operating Temperature Range With, V+ = 5V, COSC = 0, Test Circuit (Figure 1), unless otherwise indicated. Symbol Parameter Test Conditions Min Typ Max Unit I+ Supply Current R L = ∞ — 80 180 µA V+H Supply Voltage Range, High Min ≤ TA ≤ Max, 3 — 10 V R L = 10 kΩ , LV Open V+L Supply Voltage Range, Low Min ≤ TA ≤ Max, 1.5 — 3.5 V R L = 10 kΩ , LV to GND R OUT Output Source Resistance I OUT = 20mA, TA = 25°C — 70 100 Ω IOUT = 20mA, 0°C ≤ TA ≤ +70°C — — 120 Ω (C Device) IOUT = 20mA, – 40°C ≤ TA ≤ +85°C — — 130 Ω (I Device) I OUT = 20mA, – 55°C ≤ TA ≤ +125°C — 104 150 Ω (M Device) V+ = 2V, IOUT = 3 mA, LV to GND — 150 300 Ω 0°C ≤ TA ≤ +70°C V+ = 2V, IOUT = 3 mA, LV to GND — 160 600 Ω – 55°C ≤ TA ≤ +125°C (Note 3) FOSC Oscillator Frequency Pin 7 open — 10 — kHz PEFF Power Efficiency R L = 5 kΩ 95 98 — % VOUT EFF Voltage Conversion Efficiency RL = ∞ 97 99.9 — % ZOSC Oscillator Impedance V + = 2V — 1 — M Ω V+ = 5V — 100 — k Ω NOTES: 1. Connecting any input terminal to voltages greater than V+ or less than GND may cause destructive latch-up. It is recommended that no inputs from sources operating from external supplies be applied prior to "power up" of the TC7660. 2. Derate linearly above 50°C by 5.5 mW/°C. 3. TC7660M only. 4. The TC7660 can be operated without the Dx diode over full temperature and voltage range.

4-53TELCOM SEMICONDUCTOR, INC. TC7660 CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1) 500 450 400 200 150 100 –55 –25 0 +25 +50 +75 +100 +125 TEMPERATURE ( °C) Output Source Resistance vs. Temperature OUTPUT SOURCE RESISTANCE ( Ω ) V + = +2V V + = +5V –25 0 +25 +75 +100 +125 +50 Operating Voltage vs. Temperature –55 SUPPLY VOLTAGE (V) TEMPERATURE ( °C) 10k 100Ω OUTPUT SOURCE RESISTANCE ( Ω ) TA = +25°C Output Source Resistance vs. Supply Voltage 6543210 SUPPLY VOLTAGE (V) OSCILLATOR FREQUENCY (Hz) 100POWER CONVERSION EFFICIENCY (%) 100 1k 10k Power Conversion Eff. vs. Osc. Freq. TEMPERATURE ( °C) OSCILLATOR FREQUENCY (kHz) Unloaded Osc. Freq. vs. Temperature –55 –25 0 +25 +50 +75 +100 +125 V+ = +5V OSCILLATOR CAPACITANCE (pF) 10kOSCILLATOR FREQUENCY (Hz) 100 10 100 1000 10k IOUT = 1 mA TA = +25°C V+ = +5V TA = +25°C V+ = +5V IOUT = 1 mA IOUT = 15 mA 10Ω SUPPLY VOLTAGE RANGE

4-54 TELCOM SEMICONDUCTOR, INC. TC7660 CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER TYPICAL CHARACTERISTICS (Cont.) Output Voltage vs. Load Current OUTPUT VOLTAGE (V) 123 4567 8 LOAD CURRENT (mA) SLOPE 150 Ω TA = +25°C V+ = +2V LOAD CURRENT (mA) POWER CONVERSION EFFICIENCY (%) 100 100 SUPPLY CURRENT (mA) (Note) 10 20 30 40 50 60 TA = +25°C V+ = +5V Supply Current and Power Conversion Efficiency vs. Load Current POWER CONVERSION EFFICIENCY (%) LOAD CURRENT (mA) 100 SUPPLY CURRENT (mA) (Note) TA = +25°C V+ = 2V OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) Output Voltage vs. Output Current –10 10 20 30 40 50 60 70 80 90 100 TA = +25°C LV OPEN LOAD CURRENT (mA) OUTPUT VOLTAGE (V) Output Voltage vs. Load Current 10 20 30 40 50 60 70 80 TA = +25°C V+ = +5V SLOPE 55 Ω