LTC660 100mA CMOS Voltage Converter FEATURES DESCRIPTION n Simple Conversion of 5V to 5V Supply The LTC 660 is a monolithic CMOS switched-capacitor n Output Drive: 100mA voltage converter. It performs supply voltage conversion n R : 6.5 (0.65V Loss at 100mA) from positive to negative from an input range of 1.5V to OUT n BOOST Pin (Pin 1) for Higher Switching Frequency 5.5V, resulting in complementary output voltages of n Inverting and Doubling Modes 1.5V to 5.5V. It also performs a doubling at an input n Minimum Open Circuit Voltage Conversion voltage range of 2.5V to 5.5V, resulting in a doubled Efficiency: 99% output voltage of 5V to 11V. Only two external capacitors n Typical Power Conversion Efficiency are needed for the charge pump and charge reservoir with a 100mA Load: 88% functions. n Easy to Use The converter has an internal oscillator that can be U overdriven by an external clock or slowed down when APPLICATIONS connected to a capacitor. The oscillator runs at a 10kHz n frequency when unloaded. A higher frequency outside the Conversion of 5V to 5V Supplies n audio band can also be obtained if the BOOST pin is tied Inexpensive Negative Supplies + n to V . Data Acquisition Systems n High Current Upgrade to LTC1044 or LTC7660 The LTC660 contains an internal oscillator, divide-by-two, voltage level shifter and four power MOSFETs. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION Output Voltage vs + Generating 5V from 5V Load Current for V = 5V 5.0 1 8 + BOOST V 5V INPUT T = 25C A R = 6.5 OUT 2 7 + CAP OSC 4.8 + LTC660 C1 3 6 GND LV 150F 4 5 4.6 5V CAP V OUT OUTPUT C2 150F 4.4 660 TA01 4.2 4.0 0 20 40 60 80 100 LOAD CURRENT (mA) 660 TA02 1 OUTPUT VOLTAGE (V) + U ULTC660 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART TOP VIEW + Supply Voltage (V ).................................................. 6V NUMBER + BOOST 1 8 V Input Voltage on Pins 1, 6, 7 + + CAP OSC 2 7 (Note 2) ............................ 0.3V < V < (V + 0.3V) LTC660CN8 IN GND 3 6 LV Output Short-Circuit Duration to GND LTC660CS8 CAP 4 5 V OUT (Note 5) ............................................................. 1 sec Power Dissipation.............................................. 500mW N8 PACKAGE 8-LEAD PLASTIC DIP S8 PART MARKING Operating Temperature Range .................... 0C to 70C S8 PACKAGE 8-LEAD PLASTIC SOIC Storage Temperature Range ................. 65C to 150C 660 Lead Temperature (Soldering, 10 sec).................. 300C T = 100C, = 100C/W (N) JMAX JA T = 100C, = 150C/W (S) JMAX JA Consult Factory for Industrial and Military grade parts. ELECTRICAL CHARACTERISTICS + V = 5V, C1 and C2 = 150F, Boost = Open, C = 0pF, T = 25C, unless otherwise noted. OSC A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Voltage R = 1k Inverter, LV = Open l 3 5.5 V L Inverter, LV = GND l 1.5 5.5 V Doubler, LV = V l 2.5 5.5 V OUT I Supply Current No Load Boost = Open l 0.08 0.5 mA S + Boost = V l 0.23 3 mA I Output Current V More Negative Than 4V l 100 mA OUT OUT R Output Resistance I = 100mA (Note 3) l 6.5 10 OUT L f Oscillator Frequency Boost = Open 10 kHz OSC + Boost = V (Note 4) 80 kHz + Power Efficiency R = 1k Connected Between V and V l 96 98 % L OUT R = 500 Connected Between V and GND l 92 96 % L OUT I = 100mA to GND 88 % L Voltage Conversion Efficiency No Load 99 99.96 % Oscillator Sink or Source Current Boost = Open 1.1 A + Boost = V 5.0 A The l denotes specifications which apply over the full operating Note 4: f is tested with C = 100pF to minimize the effects of test OSC OSC temperature range all other limits and typicals are at T = 25C. fixture capacitance loading. The 0pF frequency is correlated to this 100pF A test point, and is intended to simulate the capacitance at Pin 7 when the Note 1: Absolute Maximum Ratings are those values beyond which the life device is plugged into a test socket and no external capacitor is used. of a device may be impaired. + Note 5: OUT may be shorted to GND for 1 sec without damage, but Note 2: Connecting any input terminal to voltages greater than V or less + shorting OUT to V may damage the device and should be avoided. Also, than ground may cause destructive latch-up. It is recommended that no + for temperatures above 85C, OUT must not be shorted to GND or V , inputs from source operating from external supplies be applied prior to even instantaneously, or device damage may result. power-up of the LTC660. Note 3: The output resistance is a combination of internal switch resistance and external capacitor ESR. To maximize output voltage and efficiency, keep external capacitor ESR < 0.2. 2 U W U W U WW