ts3 300 demo board page 1 ? 2013 touchstone semiconductor, inc. all rights reserved. features ? boost regulator ? input voltage: 0.6 v - 4.5v ? output voltage: 3v ? shutdown control jumper ? coilcraft 10h inductor (lps4018 - 103ml) ? resistor pad available for anti - crush tm voltage setting ? ldo ? output voltage: 1.8v ? shutdown control jumper ? switch/fet enable jumper component list designation qty description l1 1 10h 20% shielded inductor (4mmx4mm) , lps4018 - 103ml c 1 , c4 2 22 f 10% capacitor ( 1206 ) , 445 - 8035 - 6 - nd c 2, c3, c7 3 3.3n f 10% capacitor ( 0603 ) , 445 - 5084 - 2 - nd c5 1 10f 10% capacitor (0805) , 445 - 1371 - 2 - nd r1, r6 2 1.37 m 1% (0805) , 311 - 1.37mcrtr - nd r3, r4 2 6.81m 1% (0805) , 311 - 6.81mcrtr - nd r5 1 2.61m 1% (0805) , 541 - 2.61mctr - nd u1 1 ts3300 boost , boost_out , reg_out, gnd (2) 5 test points j1, j2, j3 3 jumper description the demo board for the ts3300 is a completely assembled and tested circuit board that can be used for evaluating the ts3300 . the ts3300 is a first generation touchstone semi power man agement product that combines a high - efficiency boost regulator and a low dropout linear regulator (ldo) in one package. the ts3300 ldos input is connected to the output of the boost regulator, serving as a post - regulator for the boost. the ts3300 includes an anti - crush tm feature to p revent the collapse of the input voltage to the boost regulator when the input is a weak (high impedance) source. if the input voltage drops below a pre - determined voltage threshold (settable by a resistor divider), the boost regulator switching cycles are paused, effectively limiting the minimum input voltage. a pull - down resistor pad is available in order to set the anti - crush tm voltage. the ts3300 boost regulat or is set to an output voltage of 3v while the ldo is set to an output voltage of 1.8v via a resistor divider circuit. the boost regulator and the ldo can be shutdown separately via a jumper. the ldo switch/fet can be fully enhanced via a jumper. the ts330 0 is fully specified over the - 40c to +85c temperature range and is available in a low - profile, thermally - enhanced 16 - pin 3x3mm tqfn package with an exposed back - side paddle. product datasheet and additional documentation can be found on the factory web site at www.touchstonesemi.com . ordering information order number description ts3300 db ts3300 demo board a 0.6 - 4.5vin, 1.8 - 5.25vout, 3.5 a, low input voltage, high - efficiency boost + ldo figure 1. ts3300 demo board (top view) figure 2. ts3300 demo board (bottom view)
ts3300 demo board ts3300 db r1p0 page 2 rtfds d escription the ts3300 boost regulator is set to an output voltage of 3v while the ldo is set to an output voltage of 1.8v via a resistor divider circuit. the boost regulator and the ldo can be shu tdown separately via j1 and the combination of j2 and j3, respectively. the ldo switch/fet can be fully enhanced via the combination of j2 and j3. refer to table 1 and table 2 . the complete demo board circuit is shown in figure 6 . resistor r1 in combination with r2 create a voltage divider circuit that set s the desired anti - crush tm voltage. the demo board does not include r2. refer to the ts3300 product datasheet applications information section for more details. boost regulator output voltage setting the output voltage can be set via a voltage divider circuit as shown in figure 3 . the output feedback (bo fb) pin is 505mv. it is recommended to use large resistor values to minimize additional current draw at the output. resistors values less than 8m are recommended. boost output voltage can be set by solving for r3 for a given r6 value in the following equation : 3 o 0 . 505 6 0 . 505 to set a 3v output voltage with r6 = 1.37m , r3 is calculated to be 6.77 m . a 1% sta ndard resistor value of 6.81m is selected. this results in an output voltage of 3.02v. ldo output voltage setting the ldo output voltage can be set independently of the boost, via a voltage divider circuit as shown in figure 4 . the output feedback (reg fb) pin is 505mv. it is recommended to use large resistor values to minimize additional current drawn from the output . the ldo output voltage can be set by solving for r4 for a given r5 value in the following equation : o t 0 . 505 5 0 . 505 to set a 1.8v output voltage with r4 = 2.61 m , r4 is calculated to be 6.69 m . a 1% standard resistor value of 6.81m is selected. this results in an output voltage of 1.82v. anti - crush tm voltage setting to set the anti - crush tm voltage, a feedback pin (bi fb) in conjunction with a voltage divider circuit can be implemented as shown in figure 5 . the feedback pin voltage is 392mv. it is recommended to use large resistor values to minimize additional current draw at the input. jumper j1 function low boost enabled high boost shutdown table 2 . boost regulator shutdown/enable settings sw en jumper j2 reg en jumper j3 condition function low high reg f b connected to r 4, r5 ldo normal o peration reg fb c onnected to bo pin ( see quick start procedure , step 6 ) ldo shutdown high low internal fet hard - o n table 1. ldo reg en(j3) and sw en(j2)settings figure 3 : setting the boost output voltage with a voltage divider figure 4 : setting the ldo output voltage with a voltage divider
ts3300 demo board ts3300 db r1p0 page 3 rtfds us ing the following equati on to solve for r1 for a given r2 value , the output voltage can be set: 1 ti s tm 0 . 3 2 2 0 . 3 2 to set a 0.8v output voltage with r2 = 1.37m , r1 is calculated to be 1.42 m . a 1% sta ndard resistor value of 1.37 m is selected. this results in an anti - crush voltage of 784mv. the anti - crush tm voltage is to be set above the minimum input voltage specification of the ts3300. refer to the ts3300 product datasheet pplications information section for more details. quick start procedure required equipment ? ts3300 demo board ? 1.2v battery ? two digital multimeter s ? solder iron ( for ldo shutdown only) to evaluate the ts3300 the following steps are to be performed: 1) connect the battery positive terminal to the test point labeled boost . connect the negative terminal of the battery to the test point labeled gnd. 2) to monitor the boost regulator output volta ge, connect the positive terminal of the voltmeter to the test point labeled boost_out. connect the negative terminal of the voltmeter to the test point labeled gnd. the output voltage should be approximately 3.02v. 3) to monitor the ldo output voltage, conn ect the positive terminal of the voltmeter to the test point labeled boost_out. connect the negative terminal of the voltmeter to the test point labeled gnd. the output voltage should be approximately 1.82v. 4) to shutdown the boost re gulator only, set to a high state via jumper j1. the output will drop to approximately 1.16v. 5) to enable the ldo internal switch/fet, set sw en to a high state and reg en to a low state via jumper j2 and j3, respectively. the ldo output voltage should be equal to the boost o utput voltage. 6) to shutdown the ldo only, remove the battery. then, remove resistor r5. solder one side of a wire to the bottom side of capacitor c7. now solder the other side of the wire to the boost_out test point. the ldo output voltage should be approx imately 0v. figure 5 : setting the anti - crush tm voltage with a voltage divider figure 6 . ts3300 demo board circuit
ts3300 demo board page 4 touchstone semiconductor, inc. ts3300 db r1p0 630 alder drive, milpitas, ca 95035 rt f ds +1 (408) 215 - 1220 ? www.touchstonesemi.com figure 7 . top layer view #1 figure 8 . top layer view #2 figure 9 . bottom layer (gnd) #1 figure 10 . bottom layer (gnd) #2
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