TC7660S TELCOM | Alldatasheet

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Technical content

4-69TELCOM SEMICONDUCTOR, INC.

FEATURES

n Oscillator boost from 10kHz to 45kHz n Converts +5V Logic Supply to ±5V System n Low Cost and Easy to Use — Only Two External Capacitors Required n Available in Small Outline (SOIC) Package n No External Diode Required for High Voltage Operation GENERAL DESCRIPTION The TC7660S is a pin-compatible upgrade to the Indus- try standard TC7660 charge pump voltage converter. It converts a +1.5V to +12V input to a corresponding -1.5V to -12V output using only two low-cost capacitors, eliminating inductors and their associated cost, size and EMI. Added features include an extended supply range to 12V, and a frequency boost pin for higher operating frequency, allowing the use of smaller external capacitors. The on-board oscillator operates at a nominal frequency of 10kHz. Frequency is increased to 45kHz when pin 1 is connected to V+. Operation below 10kHz (for lower supply current applications) is possible by connecting an external capacitor from OSC to ground (with pin 1 open). The TC7660S is available in both 8-pin DIP and 8-pin small outline (SOIC) packages in commercial and extended temperature ranges. TC7660S FUNCTIONAL BLOCK DIAGRAM TC7660S GND INTERNAL VOLTAGE REGULATOR RC OSCILLATOR VOLTAGE– LEVEL TRANSLATOR ÷ 2 V + CAP + OSC LV LOGIC NETWORK VOUT CAP –4 1BOOST SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER PIN CONFIGURATION (DIP and SOIC) TC7660SCPA TC7660SEJA TC7660SEPA TC7660SCOA TC7660SEOA Boost CAP + GND CAP – Boost CAP + GND CAP –VOUT LOW VOLTAGE (LV) OSC VOUT LOW VOLTAGE (LV) OSC +V1 TC7660S-14 9/16/96 EVALUATION KIT AVAILABLE

ORDERING INFORMATION

Part No. Package Range TC7660SCOA 8-Pin SOIC 0 °C to +70°C TC7660SCPA 8-Pin Plastic DIP 0 °C to +70°C TC7660SEJA 8-Pin CerDIP – 40 °C to +85°C TC7660SEOA 8-Pin SOIC – 40 °C to +85°C TC7660SEPA 8-Pin Plastic DIP – 40 °C to +85°C TC7660SMJA 8-Pin CerDIP – 55 °C to +125°C TC7660EV Evaluation Kit for Charge Pump Family

4-70 TELCOM SEMICONDUCTOR, INC. TC7660S SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER ELECTRICAL CHARACTERISTICS: TA = +25°C, V+ = 5V, COSC = 0, Test Circuit (Figure 1), unless otherwise indicated. Symbol Parameter Test Conditions Min Typ Max Unit I+ Supply Current R L = ∞ — 80 160 µA (Boost pin OPEN or GND) 0 °C ≤ TA ≤ +70°C — — 180 I+ Supply Current 0 °C ≤ TA ≤ +70°C — — 300 µA (Boost pin = V+) – 40 °C ≤ TA ≤ +85°C — — 350 V + H Supply Voltage Range, High Min ≤ TA ≤ Max, 3 — 12 V R L = 10 kΩ , LV Open 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 — 60 100 Ω IOUT = 20mA, 0°C ≤ TA ≤ +70°C — 70 120 IOUT = 20mA, – 40°C ≤ TA ≤ +85°C — 70 120 IOUT = 20mA, – 55°C ≤ TA ≤ +125°C — 105 150 V+ = 2V, IOUT = 3 mA, LV to GND FOSC Oscillator Frequency Pin 7 open; Pin 1 open or GND — 10 — kHz Boost Pin = V+ —4 5— PEFF Power Efficiency R L = 5 kΩ ; Boost Pin Open 96 98 — % TMIN ≤ TA ≤ TMAX ; Boost Pin Open 95 98 — Boost Pin = V+ —8 8— VOUT EFF Voltage Conversion Efficiency RL = ∞ 99 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 TC7660S. 2. Derate linearly above 50°C by 5.5mW/°C. ABSOLUTE MAXIMUM RATINGS* LV, Boost, 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.

4-76 TELCOM SEMICONDUCTOR, INC. TYPICAL CHARACTERISTICS (Cont.) TC7660S SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER Output Voltage vs. Output Current -10 -12 OUTPUT VOLTAGE V OUT (V) OUTPUT CURRENT (mA) IOUT = 20mA TA = 25°C 0 100 9080706040 503010 20 Output Source Resistance vs. Supply Voltage 100 OUTPUT SOURCE RESISTANCE ( Ω ) SUPPLY VOLTAGE (V) Output Source Resistance vs. Temperature 100 -40 -20 0 20 40 100 60 80 OUTPUT SOURCE RESISTANCE ( Ω ) TEMPERATURE ( °C) VIN = 2.5V VIN = 5.5V Power Conversion Efficiency vs. Load POWER EFFICIENCY (%) LOAD CURRENT (mA) Boost Pin = Open Boost Pin = V+ 100 60.0 55.0 50.0 40.0 35.0 30.0 25.0 20.0 15.0 10.0 9.0 7.5 6.0 4.5 3.0 2.0 1.5 1.0 Supply Current vs. Temperature 200 150 125 175 100 SUPPLY CURRENT I DD (µA) TEMPERATURE ( °C) -40 -20 0 20 40 100 60 80 VIN = 12.5V VIN = 5.5V