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ADP3000AR Datasheet(PDF) 5 Page - Analog Devices |
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ADP3000AR Datasheet(HTML) 5 Page - Analog Devices |
5 / 16 page ADP3000 Rev. A | Page 5 of 16 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS ILIM 1 VIN 2 SW1 3 SW2 4 FB (SENSE)* 8 SET 7 AO 6 GND 5 *FIXED VERSIONS ADP3000 TOP VIEW (Not to Scale) Figure 4. 8-Lead Plastic DIP (N-8) 1 2 3 4 5 6 7 ADP3000 TOP VIEW (Not to Scale) NC = NO CONNECT NC ILIM VIN SW2 NC SW1 NC 14 13 12 11 10 9 8 FB SET AO GND NC NC NC Figure 5. 14-lead TSSOP (RU-14) ADP3000 TOP VIEW (Not to Scale) ILIM 1 VIN 2 SW1 3 SW2 4 FB (SENSE)* SET AO GND 8 7 6 5 *FIXED VERSIONS Figure 6. 8-Lead SOIC (R-8) Table 3. Pin Function Descriptions Mnemonic Function ILIM For normal conditions, connect to VIN. When lower current is required, connect a resistor between ILIM and VIN. To limit the switch current to 400 mA, connect a 220 Ω resistor. VIN Input Voltage. SW1 Collector of Power Transistor. For step-down configuration, connect to VIN. For step-up configuration, connect to an inductor/diode. SW2 Emitter of Power Transistor. For step-down configuration, connect to inductor/diode. For step-up configuration, connect to ground. Do not allow pin to go more than a diode drop below ground. GND Ground. AO Auxiliary Gain Block (GB) Output. Open collector can sink 300 µA. This pin can be left open if not used. SET Auxiliary Gain Amplifier Input. The amplifier’s positive input is connected to the SET pin, and its negative input is connected to the 1.245 V reference. This pin can be left open if not used. FB/SENSE On the ADP3000 (adjustable) version, this pin is connected to the comparator input. On the ADP3000-3.3, the ADP3000-5, and the ADP3000-12, the pin goes directly to the internal resistor divider that sets the output voltage. COMPARATOR GAIN BLOCK/ ERROR AMP OSCILLATOR DRIVER 1.245V REFERENCE ADP3000 SET VIN GND FB A0 ILIM SW1 SW2 A2 A1 Figure 7. Functional Block Diagram for Adjustable Version COMPARATOR GAIN BLOCK/ ERROR AMP OSCILLATOR DRIVER 1.245V REFERENCE R1 R2 ADP3000 SET VIN GND SENSE A0 ILIM SW1 SW2 A1 Figure 8. Functional Block Diagram for Fixed Version |
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