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LM20143 Datasheet(PDF) 2 Page - Texas Instruments |
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LM20143 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 30 page FB PGOOD COMP NC PVIN PVIN SW SS/TRK AVIN VCC EN PGND PGND SW AGND RT Exposed Pad On Bottom (EP) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 LM20143 SNVS528F – OCTOBER 2007 – REVISED NOVEMBER 2011 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Connection Diagram Top View See Package Number PWP0016A Pin Descriptions Pin # Name Description Soft-Start or Tracking control input. An internal 5 µA current source charges an external capacitor to set the 1 SS/TRK Soft-Start ramp rate. If driven by a external source less than 800 mV, this pin overrides the internal reference that sets the output voltage. If left open, an internal 1ms Soft-Start ramp is activated. Feedback input to the error amplifier from the regulated output. This pin is connected to the inverting input of 2 FB the internal transconductance error amplifier. An 800 mV reference connected to the non-inverting input of the error amplifier sets the closed loop regulation voltage at the FB pin. Power good output signal. Open drain output indicating the output voltage is regulating within tolerance. is 3 PGOOD recommend for most applications. External compensation pin. Connect the compensation network to resistor and capacitor to this pin to 4 COMP compensate the device. This pin has no internal connection. While this pin may be left open, it is strongly recommended that this pin 5 NC be connected to Ground. Input voltage to the power switches inside the device. These pins should be connected together at the device. 6,7 PVIN A low ESR capacitor should be placed near these pins to stabilize the input voltage. 8,9 SW Switch pin. The PWM output of the internal power switches. 10,11 PGND Power ground pin for the internal power switches. Precision enable input for the device. An external voltage divider can be used to set the device turn-on 12 EN threshold. If not used the EN pin should be connected to PVIN. 13 VCC Internal 2.7V sub-regulator. This pin should be bypassed with a 1 µF ceramic capacitor. 14 AVIN Analog input supply that generates the internal bias. Must be connected to VIN through a low pass RC filter. 15 AGND Quiet analog ground for the internal bias circuitry. 16 RT Frequency adjust pin. Connecting a resistor on this pin to ground will set the oscillator frequency. Exposed metal thermal pad on the underside of the package with a weak electrical connection to ground. It is EP Exposed Pad recommended to connect this pad to the PC board ground plane copper in order to improve heat dissipation and reduce the package θJA. Do not connect to any potential other than Ground. 2 Submit Documentation Feedback Copyright © 2007–2011, Texas Instruments Incorporated Product Folder Links: LM20143 |
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