TS3300 Demo Board A 0.6-4.5VIN, 1.8-5.25VOUT, 3.5µA, Low Input Voltage, High-Efficiency Boost + LDO FEATURES 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 management product that combines a high-efficiency boost regulator and a low dropout linear regulator (LDO) in one package. The TS3300 LDO’s input is connected to the output of the boost regulator, serving as a postregulator for the boost. Boost Regulator Input Voltage: 0.6V- 4.5V Output Voltage: 3V Shutdown Control Jumper Coilcraft 10µH Inductor (LPS4018-103ML) TM Resistor Pad Available for Anti-Crush Voltage Setting LDO Output Voltage: 1.8V Shutdown Control Jumper Switch/FET Enable Jumper TM COMPONENT LIST DESIGNATION QTY DESCRIPTION L1 1 C1, C4 2 C2, C3, C7 3 C5 1 R1, R6 2 R3, R4 2 R5 1 U1 BOOST,BOOST_OUT, REG_OUT, GND (2) J1, J2, J3 1 5 10µH ±20% Shielded Inductor (4mmx4mm), LPS4018-103ML 22µF ±10% capacitor (1206), 445-8035-6-ND 3.3nF ±10% capacitor (0603), 445-5084-2-ND 10µF ±10% capacitor (0805), 445-1371-2-ND 1.37MΩ ± 1% (0805), 311-1.37MCRTR-ND 6.81MΩ ± 1% (0805), 311-6.81MCRTR-ND 2.61MΩ ± 1% (0805), 541-2.61MCTR-ND TS3300 Test points 3 Jumper The TS3300 includes an anti-crush feature to prevent 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 predetermined 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 TM to set the anti-crush voltage. 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 shutdown separately via a jumper. The LDO switch/FET can be fully enhanced via a jumper. The TS3300 is fully specified over the -40°C to +85°C 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 TS3300DB Figure 1. TS3300 Demo Board (Top View) Description TS3300 Demo Board Figure 2. TS3300 Demo Board (Bottom View) Page 1 © 2013 Touchstone Semiconductor, Inc. All rights reserved. TS3300 Demo Board DESCRIPTION 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 shutdown 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 TM divider circuit that sets the desired anti-crush voltage. The demo board does not include R2. Refer to the TS3300 product datasheet “Applications Information” section for more details. SW EN Jumper J2 low REG EN Jumper J3 high CONDITION REG FB connected to R4, R5 REG FB connected to BO pin (See “Quick Start Procedure”, step 6) To set a 3V output voltage with R6 = 1.37MΩ, R3 is calculated to be 6.77MΩ. A 1% standard resistor value of 6.81MΩ 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. FUNCTION LDO Normal Operation LDO Shutdown Internal FET Hard-on Table 1. LDO REG EN(J3) and SW EN(J2)Settings high FB) pin is 505mV. It is recommended to use large resistor values to minimize additional current draw at the output. Resistors values less than 8MΩ are recommended. Boost output voltage can be set by solving for R3 for a given R6 value in the following equation: 6 O 0.505 3 0.505 Figure 4: Setting the LDO Output Voltage with a Voltage Divider low FUNCTION Jumper J1 low Boost Enabled high Boost Shutdown Table 2. Boost Regulator Shutdown/Enable Settings 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 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: 0.505 0.505 O T 5 To set a 1.8V output voltage with R4 = 2.61MΩ, R4 is calculated to be 6.69MΩ. A 1% standard resistor value of 6.81MΩ is selected. This results in an output voltage of 1.82V. ANTI-CRUSH TM VOLTAGE SETTING TM To set the anti-crush 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. Figure 3: Setting the Boost Output Voltage with a Voltage Divider TS3300DB r1p0 Page 2 RTFDS TS3300 Demo Board 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. Figure 5: Setting the Anti-Crush with a Voltage Divider TM Voltage Using the following equation 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 = 1.37MΩ, R1 is calculated to be 1.42MΩ. A 1% standard resistor value of 1.37MΩ is selected. This results in an antiTM crush voltage of 784mV. The anti-crush 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 Multimeters Solder Iron ( for LDO shutdown only) 2) To monitor the boost regulator output voltage, 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, 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 1.82V. 4) To shutdown the boost regulator 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 output 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 approximately 0V. Figure 6. TS3300 Demo Board Circuit TS3300DB r1p0 Page 3 RTFDS TS3300 Demo Board Figure 7. Top Layer View #1 Figure 8. Top Layer View #2 Figure 9. Bottom Layer (GND) #1 Figure 10. Bottom Layer (GND) #2 Page 4 Touchstone Semiconductor, Inc. 630 Alder Drive, Milpitas, CA 95035 +1 (408) 215 - 1220 ▪ www.touchstonesemi.com TS3300DB r1p0 RTFDS