MAX865 19-0472 Rev 1 7/97 Compact, Dual-Output Charge Pump General Description Features The MAX865 is a CMOS charge-pump DC-DC convert- 1.11mm-High MAX Package er in an ultra-small MAX package. It produces positive 2 Compact: Circuit Fits in 0.08in and negative outputs from a single positive input, and requires only four capacitors. The charge pump first Requires Only Four Capacitors doubles the input voltage, then inverts the doubled volt- Dual Outputs (positive and negative) age. The input voltage ranges from +1.5V to +6.0V. The internal oscillator is guaranteed to be between +1.5V to +6.0V Input Voltage 20kHz and 38kHz, keeping noise above the audio 20kHz (min) Frequency (above the audio range) range while consuming minimal supply current. A 75 output impedance permits useful output currents up to 20mA. The MAX865 comes in a 1.11mm-high, 8-pin MAX package that occupies half the board area of a stan- dard 8-pin SOIC. For a device with selectable frequen- Ordering Information cies and logic-controlled shutdown, refer to the MAX864 data sheet. PART TEMP. RANGE PIN-PACKAGE Applications MAX865C/D 0C to +70C Dice MAX865EUA -40C to +85C 8 MAX Low-Voltage GaAsFET Bias in Wireless Handsets VCO and GaAsFET Supplies Split Supply from 3 Ni Cells or 1 Li+ Cell Low-Cost Split Supply for Low-Voltage Data-Acquisition Systems Split Supply for Analog Circuitry Typical Operating Circuit LCD Panels V IN (+1.5V to +6.0V) Pin Configuration IN C1+ MAX865 +2*V V+ IN TOP VIEW C1- C2+ C1- 1 8 C1+ -2*V IN V- C2+ 2 7 V+ MAX865 C2- C2- 3 6 IN GND V- 4 5 GND MAX GND GND +V to 2V CONVERTER IN IN Maxim Integrated Products 1 For free samples & the latest literature: Compact, Dual-Output Charge Pump ABSOLUTE MAXIMUM RATINGS V+ to GND.................................................................+12V, -0.3V Operating Temperature Range IN to GND.................................................................+6.2V, -0.3V MAX865EUA .....................................................-40C to +85C V- to GND ..................................................................-12V, +0.3V Storage Temperature Range .............................-65C to +160C V- Output Current .............................................................100mA Lead Temperature (soldering, 10sec) .............................+300C V- Short-Circuit to GND ................................................Indefinite Continuous Power Dissipation (T = +70C) A MAX (derate 4.1mW/C above +70C) .......................330mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond 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 (V = 5V, C1 = C2 = C3 = C4 = 3.3F, T = T to T , unless otherwise noted. Typical values are at T = +25C.) IN A MIN MAX A PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Supply Voltage R = 10k 2.0 1.5 V LOAD Maximum Supply Voltage R = 10k 6.0 V LOAD T = +25C 0.6 1.05 A Supply Current mA T = -40C to +85C (Note 1) 1.15 A T = +25C 19.5 24 32.5 A Oscillator Frequency kHz T = -40C to +85C (Note 1) 18 34 A T = +25C 150 200 A I = 1mA, V+ I = 0mA V- T = T to T 280 A MIN MAX Output Resistance T = +25C 75 100 A V+ = 10V (forced), I = 1mA V- T = T to T 140 A MIN MAX Power Efficiency I = 5mA 85 % L V+, R = L 95 99 Voltage Conversion Efficiency % V-, R = L 90 98 Note 1: These specifications are guaranteed by design and are not production tested. Typical Operating Characteristics (Circuit of Figure 1, V = 5V, T = +25C, unless otherwise noted.) IN A EFFICIENCY vs. OUTPUT CURRENT EFFICIENCY vs. OUTPUT CURRENT EFFICIENCY vs. OUTPUT CURRENT (V = 5V) (V = 3.3V) (V = 2V) IN IN IN 100 100 100 V+ V+ V+ 90 90 90 V- 80 80 80 V- V- 70 70 70 60 60 60 50 50 50 40 40 40 30 30 30 20 20 20 10 10 10 0 0 0 0 0.5 1.0 1.5 2.0 2.5 0 2 4 6 8 10 12 14 16 18 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 2 MAX865 EFFICIENCY (%) MAX865-01 EFFICIENCY (%) MAX865-02 EFFICIENCY (%) MAX865-03