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TS3300 Datasheet(PDF) 12 Page - Touchstone Semiconductor Inc |
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TS3300 Datasheet(HTML) 12 Page - Touchstone Semiconductor Inc |
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12 / 14 page  TS3300 Page 12 TS3300DS r1p0 RTFDS The LDO was designed to operate in conjunction with the boost regulator where the output of the boost regulator is connected to the input to the linear regulator. The LDO can provide an output voltage based on the resistor divider circuit as shown in Figure 3 or the output voltage can be set to the input voltage where the internal switch/FET is fully enhanced. Table 1 summarizes the settings for pins REG EN and SW EN. Figure 4 shows the configuration where the internal switch/FET is fully enhanced (SW EN =high, REG EN = low) so the boost output is equal to the LDO output. The LDO can be shutdown by connecting the REF FB pin to BO when SW EN = low and REG EN = high. APPLICATIONS INFORMATION Inductor Selection A low ESR, shielded 10 H inductor is recommended for most applications and provides the best compromise between efficiency and size. A low loss ferrite and low dc resistance (DCR) inductor is best for optimal efficiency. Furthermore, there should exist at least an 8% margin between the saturation current of the inductor and the peak inductor current for a given set of operating conditions. Table 2 provides a list of inductor manufactures. Refer to the Inductor Peak Current vs Load Current plot in the “Typical Performance Characteristics” section. This plot shows how the inductor peak current varies with load current with a LPS4018-103ML inductor from Coilcraft. Input and Output Capacitor Selection For the boost regulator, a low ESR ceramic input and output capacitor of at least 10 F is recommended to be placed as close as possible to the BI and BO pin. Output voltage ripple can be reduced by increasing the value of the output capacitor while providing improved transient response. Ceramic capacitors with X5R dielectric are recommended. For the LDO, a low ESR ceramic input and output capacitor of at least 10 F is recommended to be placed as close as possible to the REG OUT pin. Refer to Table 2 for a list of inductor and capacitor manufacturers. Buck-Boost Function The TS3300 can act as a buck-boost device. For instance, if two 1.5V alkaline cells are used to power the TS3300, the boost output voltage (VBO) can be set to 5V and the LDO output voltage (VREGOUT) can be set to 2.5V. The output voltage for the boost regulator and the LDO can be set according to Figure 2 and 3, respectively. Boost Input Anti-Crush TM Feature The TS3300 includes an anti-crush TM 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 determined voltage threshold (settable by a resistor divider), the boost regulator switching cycles are paused, effectively limiting the minimum input voltage. Anti-crush TM is useful in applications where a buffer capacitor at the boost’s output can service burst loads, and the input source exhibits substantial source impedance (such as with an old battery, or at cold temperatures). 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 7. The feedback pin voltage is 392mV. It is recommended to use large resistor values to minimize additional current draw at the input. SW EN REG EN CONDITION FUNCTION low high Connect REG EN pin to BO pin LDO Normal Operation Connect REG FB pin to BO pin LDO Shutdown high low Connect SW EN pin to BO pin Internal FET Hard-on Table 1. LDO REG EN and SW EN Settings Inductors Supplier Website Coilcraft www.coilcraft.com Murata www.murata.com Sumida www.sumida.com Capacitors Taiyo Yuden www.t-yuden.com Murata www.murata.com AVX www.avxcorp.com TDK www.component.tdk.com Table 2. Inductor and Capacitor Manufactures |
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