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LM2652 Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM2652 Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 3 page Connection Diagram TOP VIEW 20117202 28-Lead Plastic (TSSOP Exposed Pad) See NS Package Number MXA28A Pin Descriptions SW1 (Pins 1, 28): The switch node pins for Channel 1. Connect the Channel 1 output inductor to these pins. PVIN1 (Pins 2, 3): Input voltage supply for the Channel 1 switch. In a split-rail system, this supply should not exceed the voltage at the AVIN pin. PG1 (Pin 4): Open drain Power Good flag for Channel 1. When this pin voltage is high, the output voltage is ready to deliver power to the load. Connect to AVIN through a 10k Ω pull-up resistor. EN1 (Pin 5): Channel 1 logic enable. Input to a CMOS Schmitt trigger. Set this input high for normal operation. When low, Channel 1 is in shutdown mode. Connect to ground through a 100k Ω pull-down resistor. AVIN (Pin 6): Power supply for the system. Bypass this pin with a small (0-10 Ω, 1 µF) filter if it is connected to the same rail as PVIN. SYNC (Pin 7): PWM frequency adjust. Connect a PWM clock to this pin. If unused, connect this pin to ground. NC (Pin 8): No internal connection. This pin should be connected to ground. AGND (Pin 9): Ground pin for the signal level circuitry. Must be connected to the system ground. EN2 (Pin 10): Channel 2 logic enable. Input to a CMOS Schmitt trigger. Set this input high for normal operation. When low, Channel 2 is in shutdown mode. Connect to ground through a 100k Ω pull-down resistor PG2 (Pin 11): Open drain Power Good flag for Channel 2. When this pin level is high, the Output voltage is ready to deliver power to the load. Connect to AVIN through a 10k Ω pull-up resistor. PVIN2 (Pin 12,13): Input voltage supply for the Channel 2 switch. In a split-rail system, this supply should not exceed the voltage at the AVIN pin. SW2 (Pin 14, 15): The switch node pins for Channel 2. Connect the Channel 2 output inductor to these pins. PGND2 (Pin 26, 27): Ground pins for the high current cir- cuitry. Must be connected to the system ground. SNS2 (Pin 18): The output voltage (V O) sense pin for Chan- nel 2. Connect this pin directly to the load. FB2 (Pin 19): The input to the error amplifier of Channel 2. COMP2 (Pin 20): The output of the Channel 2 error ampli- fier. SS2 (Pin 21): Soft start pin for Channel 2. Connect a small capacitor to this pin to control the slew rate of V O2 during start-up. SS1 (Pin 22): Soft start pin for Channel 1. Connect a small capacitor to this pin to control the slew rate of V O1 during start-up. COMP1 (Pin 23): The output of the Channel 1 error ampli- fier. FB1 (Pin 24): The input to the error amplifier of Channel 1. SNS1 (Pin 25): The output voltage (V O) sense pin for Chan- nel 1. Connect this pin directly to the load. PGND2 (Pins 16, 17): Ground pins for the high current circuitry. Must be connected to the system ground. EXPOSED PAD: Connect to power ground. www.national.com 2 |
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