Switching Regulator LTC1046CS8#PBF?LTC?1046 is a 50mA monolithic CMOS switched capacitor voltage converter. It plugs into the ICL7660/LTC1044 in 5V applications that require more output current. Switching Regulator LTC1046CS8#PBF This device is optimized for high current capability at input voltages of 6V or lower. It trades operating voltage for higher output current. Switching Regulator LTC1046CS8#PBF The LTC1046 provides several voltage translation functions: the input voltage can be inverted (VOUT = -VIN), divided by (VOUT = VIN/2) or multiplied (VOUT = ±nVIN). The LTC1046 is designed to be pin-to-pin and functionally compatible with the ICL7660 and LTC1044, and the switching regulator LTC1046CS8#PBF provides 2.5 times the output drive capability.

The switching regulator LTC1046CS8#PBF ? CMOS logic gate is the best, switching regulator LTC1046CS8#PBF because it can operate over a wide supply voltage range (3V to 15V) and has enough voltage swing to drive the internal voltage regulator. Mitt trigger. For 5V applications, TTL logic gates can be used by simply adding an external pull-up resistor (see Figure 6

Capacitor Selection Although the exact values of CIN and COUT are not critical, high-quality, low-ESR capacitors such as solid tantalum are necessary to reduce voltage losses at high currents. For CIN, since the switch current is approximately twice the output current, the ESR effect of the capacitor will be multiplied by 4 and losses will occur during the charge and discharge cycles. This means that using a capacitor of ESR 1Ω CIN will have the same effect as increasing the output impedance of the LTC1046 4Ω. This represents a significant increase in voltage loss. For COUT, the effect of ESR is less pronounced. COUT is alternately charged and discharged at a current approximately equal to the output current, and the ESR of the capacitor produces a step function in the output ripple during switching transitions. This step function will reduce output regulation to accommodate changes in output load current and should be avoided. Recognizing that large value tantalum capacitors are expensive, a technique can be employed to parallelize smaller tantalum capacitors with larger aluminum electrolytic capacitors to obtain lower ESR and reasonable cost. Where physical size is a concern, some of the newer chip surface mount tantalum capacitors can be used. These capacitors are typically rated for operating voltages in the 10V to 20V range and exhibit very low ESR (0.1Ω) ranges.

The internal logic of the LTC1046 runs between V+ and LV (pin 6), when V+ is greater than or equal to 3V, the internal switch shorts LV to GND (pin 3), and when V+ is less than 3V, the LV pin is tied to on the ground. For V+ greater than or equal to 3V, the LV pin can be tied to ground or left floating.

The switching frequency can be increased, decreased or driven by an external source. Figure 5 shows a functional diagram of the oscillator circuit. By connecting the boost (pin 1) to V+, the charge and discharge currents are increased and, therefore, the frequency is approximately tripled. Increasing frequency will reduce output impedance and ripple for higher load currents. The larger the load pin 7 capacitance, the lower the frequency. Using the boost pin in combination with an external capacitor on pin 7 allows the user to select a wide range of frequencies. Driving the LTC1046 from an external frequency source can easily be accomplished by driving pin 7 and leaving the BOOST pin open, as shown in Figure 6. The output current from pin 7 is small, typically 15µA, so this current logic gate is able to drive.