DEMO C IR C U IT 12 19 LT3495, LT3495B, LT3495-1, Q U IC AND K S TA LT3495B-1 R T G U IDE L T 3 4 9 5 , L T 3 4 9 5 B , L T 3 4 9 5 -1, a n d L T 3 4 9 5 B -1 Mic ro p o w e r L o w N o is e B o o s t C o n v e rte rs W ith Ou tp u t Dis c o n n e c t DESCRIPTION Dem onstration circuits 1219A-A, -B, -C and -D are M icropow er Low Noise Boost Converters W ith Output Disconnect featuring the four different Lt3495 versions: LT3495, LT3495B, LT3495-1, and LT3495B-1. All versions convert a 3V-6V source to 15V. The –A and -B versions supply 75m A at 3Vin w hile the -C and -D supply 36m A. The –A and –C versions feature the LT3495EDDB and the LT3495EDDB-1 respectively, w hich have nonaudible sw itching frequency over the entire load range. AllLT3495 versions feature a low noise controlschem e, integrated output disconnect function, dim m ing control, and single output sense resistor. These circuits are in- tended for space-conscious applications such as OLED pow er, M P3 Players, and Low Noise Bias Supplies. The LT3495 datasheet gives a com plete description of the parts, operation and application inform ation. The datasheet m ust be read in conjunction w ith this quick start guide for w orking on or m odifying the dem o circuit 1219. Design files for this circuit board are available. Call the LTC factory. L, LTC, LTM , LT are registered tradem arks ofLinear Technology Corporation. PERF ORM A NCE SU M M A RY F OR DC1 2 1 9 A -A /L T3 4 9 5 A ND DC1 2 1 9 A -B /L T3 4 9 5 B Specifications are at TA = 25°C SYM BOL VIN VOUT VOUT PARAM ETER Input Supply Range Output Voltage Range Output Voltage Range RIPPLE EFFICIENCY EFFICIENCY Load at Vout Load at Vout CONDITIONS VIN = 3.6V, ILOAD = 75m A VIN = 6V, ILOAD = 75m A VIN = 3.6V, ILOAD = 75m A VIN = 3.6V, ILOAD = 75m A VIN = 6V, ILOAD = 75m A M IN 3 14.6 14.6 TYP 15 15 10 80.5 83.5 M AX 6 15.4 15.4 UNITS V V V mV % % M AX 6 15.4 15.4 UNITS V V V mV % % PERF ORM A NCE SU M M A RY F OR DC1 2 1 9 A -C/L T3 4 9 5 -1 A ND DC1 2 1 9 A -D/L T3 4 9 5 B -1 Specifications are at TA = 25°C SYM BOL VIN VOUT VOUT PARAM ETER Input Supply Range Output Voltage Range Output Voltage Range RIPPLE EFFICIENCY EFFICIENCY Load at Vout Load at Vout CONDITIONS VIN = 3.6V, ILOAD = 36m A VIN = 6V, ILOAD = 36m A VIN = 3.6V, ILOAD = 36m A VIN = 3.6V, ILOAD = 36m A VIN = 6V, ILOAD = 36m A M IN 3 14.6 14.6 TYP 15 15 10 82.5 84.5 1 LT3495, LT3495B, LT3495-1, AND LT3495B-1 Q U ICK STA RT PROCEDU RE Dem onstration circuit 1219 is easy to set up to evaluate the perform ance ofthe LT3495, LT3495B, LT3495-1, and LT3495B-1. Refer to Figure 1 for proper m easurem ent equipm ent setup and follow the procedure below : NOTE. W hen m easuring the input or output voltage ripple, care m ust be taken to avoid a long ground lead on the oscilloscope probe. M easure the input or output voltage ripple by touching the probe tip directly across the Vin or Vout and GND term inals. See Error! Reference source not found. for proper scope probe technique. 1. Place jum pers in the follow ing positions: JP1 - Run 2. W ith pow er off, connect the input pow er supply to Vin and G N D. 3. Turn on the pow er at the input. Check for the proper output voltages. Vout = 14.6V to 15.4V. NOTE. Ifthere is no output, tem porarily disconnect the load to m ake sure that the load is not set too high. 4. O nce the proper output voltage is established, adjust the load w ithin the operating range and observe the output voltage regulation, ripple voltage, efficiency and other param eters. Figure 1. Proper M easurem ent Equipm ent Setup GND VIN Figure 2. M easuring Input or output Ripple 2 LT3495, LT3495B, LT3495-1, AND LT3495B-1 3