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CS5208-1 Datasheet(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS5208-1 Datasheet(HTML) 4 Page - Cherry Semiconductor Corporation |
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4 / 7 page  Application Notes The CS5208-1 linear regulator has a composite PNP-NPN output stage that requires an output capacitor for stability. A detailed procedure for selecting this capacitor is includ- ed in the Stability Considerations section. Design Guidelines This LDO adjustable regulator has an output voltage range of 1.25V to 4.5V. An external resistor divider sets the out- put voltage as shown in Figure 1. The regulatorÕs voltage sensing error amplifier maintains a fixed 1.25V reference between the output pin and the adjust pin. A resistor divider network R1 and R2 causes a fixed current to flow to ground. This current creates a voltage across R2 that adds to the 1.25V across R1 and sets the overall output voltage. The adjust pin current (typically 50µA) also flows through R2 and adds a small error that should be taken into account if precise adjustment of Vout is necessary. The output voltage is set according to the formula: VOUT = VREF ´ + R2 ´ IAdj The term IAdj ´ R2 represents the error added by the adjust pin current. R1 is chosen so that the minimum load current is a least 10mA. R1 and R2 should be of the same composition for best tracking over temperature. The divider resistors should be placed as close to the IC as possible and connect- ed to the output with a separate metal trace. R1 + R2 R1 Adjustable Operation Theory of Operation 4 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 VIN-VOUT (V) 4.0 4.5 5.0 5.5 Output Current (A) 0.00 0.25 0.50 0.75 1.00 1.25 0.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 8.0 1.00 2.00 3.00 4.00 5.00 VIN – VOUT (V) 0.80 0.82 0.88 0.90 0.98 1.00 TCASE = 23°C 0.84 0.86 0.92 0.94 0.96 TCASE = 125°C TCASE = 0°C Typical Performance Characteristics: continued Dropout Voltage vs. Output Current Short Circuit Current vs. VIN - VOUT Minimum Load Current vs. VIN - VOUT 10 1 10 2 10 3 10 4 10 5 20.0 30.0 50.0 70.0 90.0 Frequency (Hz) 80.0 60.0 40.0 10.0 V IN - VOUT = 2V V Ripple = 1VPP IOUT = 4A C Adj = 0.1mF C OUT = 22mF 10 6 Ripple Rejection vs. Frequency |
Similar Part No. - CS5208-1 |
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Similar Description - CS5208-1 |
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