LTC1502-3.3 Single Cell to 3.3V Regulated Charge Pump DC/DC Converter FEATURES DESCRIPTIO n Input Voltage Range: 0.9V to 1.8V The LTC 1502-3.3 is a quadrupler charge pump DC/DC n 0.9V Guaranteed Start-Up Voltage converter that produces a regulated 3.3V output from a n Regulated Output Voltage: 3.3V 4% single alkaline cell input. It requires only five small external n Output Current: 10mA (V 1V) capacitorsno inductors are required. Low supply cur- IN n No Inductors rent (40m A typical, 5m A in shutdown) and minimal external n Shutdown Disconnects Load from V components make the LTC1502-3.3 ideal for space and IN n Low Operating Current: 40m A power conscious single-cell applications. The total printed n Low Shutdown Current: 5m A circuit board area of the circuit shown below is less than 2 n Short-Circuit and Overtemperature Protected 0.125in . 2 n Application Circuit Fits in <0.125in PCB Area Forcing the C1 /SHDN pin low through an external resis- n Available in 8-Pin MSOP and SO Packages tive pull-down puts the part into shutdown mode. During shutdown, the internal oscillator is stopped and the load is U disconnected from V . An internal pull-up current on the APPLICATIO S IN C1 /SHDN pin forces the part back into normal operation n Pagers once the pull-down resistance is removed. n Battery Backup Supplies The LTC1502-3.3 is short-circuit protected and survives n Portable Electronic Equipment an indefinite V short to ground. The LTC1502-3.3 is n OUT Handheld Medical Instruments available in 8-pin MSOP and SO packages. n Glucose Meters , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Single Cell to 3.3V DC/DC Converter Output Voltage vs Input Voltage 3.5 1 8 T = 25C V = 3.3V A OUT C2 V OUT I = 10mA OUT 10m F 2 7 10m F + + C1 C3 3.4 1m F LTC1502-3.3 1m F 3 6 C1 /SHDN C3 3.3 4 5 V IN GND V IN SINGLE CELL 10m F NiCd or I = 10mA OUT ALKALINE 3.2 I = 15mA OUT 1502-3.3 TA01 3.1 2 PCB LAYOUT FITS IN <0.125IN 3.0 0.8 1.0 1.2 1.4 1.6 1.8 INPUT VOLTAGE (V) 1502-3.3 TA02 1 OUTPUT VOLTAGE (V) U ULTC1502-3.3 ABSOLUTE MAXIMUM RATINGS (Note 1) V to GND .................................................. 0.3V to 2V Operating Temperature Range IN V to GND ............................................... 0.3V to 5V Commercial ............................................ 0 C to 70 C OUT All Other Pins to GND ................................. 0.3V to 5V Extended Commercial (Note 4).......... 40 C to 85 C V Short-Circuit Duration............................ Indefinite Industrial ........................................... 40 C to 85 C OUT Storage Temperature Range ................ 65 C to 150 C Lead Temperature (Soldering, 10 sec)................. 300 C PACKAGE/ORDER INFORMATION ORDER PART ORDER PART TOP VIEW NUMBER NUMBER TOP VIEW C2 1 8 V OUT C2 1 8 V OUT LTC1502CMS8-3.3 LTC1502CS8-3.3 + + + + C1 2 7 C3 C1 2 7 C3 LTC1502IS8-3.3 C1 /SHDN 3 6 C3 C1 /SHDN 3 6 C3 GND 4 5 V IN GND 4 5 V IN MS8 PACKAGE MS8 PART MARKING S8 PART MARKING 8-LEAD PLASTIC MSOP S8 PACKAGE T = 125 C, q = 250 C/ W JMAX JA 8-LEAD PLASTIC SO 150233 LTEC T = 125 C, q = 150 C/ W JMAX JA 502I33 Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. A V = 0.9V to 1.8V, C1 = C3 = 1m F, C = C2 = C = 10m F unless otherwise specified. IN IN OUT PARAMETER CONDITIONS MIN TYP MAX UNITS V Operating Voltage l 0.9 1.8 V IN Minimum V Start-Up Voltage T = 0 C to 70 C (Note 2) l 0.75 0.9 V IN A T = 40 C to 85 C (Note 2) l 1.1 V A V Voltage I 3.5mA, 0.9V V 1.8V l 3.17 3.3 3.43 V OUT OUT IN I 10mA, 1V V 1.8V l 3.17 3.3 3.43 V OUT IN V Operating Current I = 0mA l 40 90 m A IN OUT V Shutdown Current C1 /SHDN = 0V l 515 m A IN Output Ripple I = 10mA, V = 1.25V 50 mV OUT IN P-P Efficiency V = 1V, I = 10mA 77 % IN OUT Switching Frequency Oscillator Free-Running 500 kHz C1 /SHDN Shutdown Input Threshold C1 /SHDN in Hi-Z Sampling State l 0.20 0.55 0.85 V C1 /SHDN Shutdown Input Current C1 /SHDN = 0V (Note 3) l 0.5 2.5 8 m A V Turn-On Time V = 1V, I = 0mA 5 ms OUT IN OUT V Short-Circuit Current V = 1.5V, V Forced to 0V 20 mA OUT IN OUT Note 1: Absolute Maximum Ratings are those values beyond which the life Note 4: Commercial grade specifications are guaranteed over the 0 C to of the device may be impaired. 70 C operating temperature range. In addition, commercial grade specifications are assured over the 40 C to 85 C operating temperature Note 2: Start-up testing is done with a 100kW equivalent load on V . OUT range by design, characterization and correlation with statistical process Note 3: Currents flowing into the device are positive polarity. Currents controls. Industrial grade specifications are guaranteed and tested over the flowing out of the device are negative polarity. 40 C to 85 C operating temperature range. 2 U W U W U WW