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LM20323 Datasheet(PDF) 2 Page - Texas Instruments |
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LM20323 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 28 page  VIN 1 FB SS/TRK SW VIN GND AGND SW EN VIN PGOOD COMP EP VCC 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 SW GND GND SW VIN NC BOOT CIN VIN SW AGND FB PGOOD VOUT RFB1 RFB2 COUT EN SS/TRK VCC CVCC CC1 COMP RC1 VIN LM20323 BOOT GND L CBOOT D1 (Optional) LM20323 SNVS557B – MAY 2008 – REVISED JANUARY 2009 www.ti.com Simplified Application Circuit Connection Diagram Figure 1. Top View eTSSOP-20 Package Pin Functions Pin Descriptions Pin(s) Name Description Application Information 1 SS/TRK Soft-Start or Tracking control input An internal 4.5 µA current source charges an external capacitor to set the soft-start rate. The PWM can track to an external voltage ramp with a low impedance source. If left open, an internal 1 ms SS ramp is activated. 2 FB Feedback input to the error amplifier This pin is connected to the inverting input of the internal from the regulated output transconductance error amplifier. An 800 mV reference is internally connected to the non-inverting input of the error amplifier. 3 PGOOD Power good output signal Open drain output indicating the output voltage is regulating within tolerance. A pull-up resistor of 10 k Ω to 100 kΩ is recommended if this function is used. 4 COMP Output of the internal error amplifier and The loop compensation network should be connected between the input to the Pulse Width Modulator COMP pin and the AGND pin. 5,6,15,16 VIN Input supply voltage Nominal operating range: 4.5V to 36V. 7,8,13,14 SW Switch pin The drain terminal of the internal Synchronous Rectifier power NMOSFET and the source terminal of the internal Control power NMOSFET. 9,10,11 GND Ground Internal reference for the power MOSFETs. 12 AGND Analog ground Internal reference for the regulator control functions. 17 BOOT Boost input for bootstrap capacitor An internal diode from VCC to BOOT charges an external capacitor required from SW to BOOT to power the Control MOSFET gate driver. 18 VCC Output of the high voltage linear VCC tracks VIN up to about 7.2V. Above VIN = 7.2V, VCC is regulated regulator. The VCC voltage is regulated to approximately 5.5 Volts. A 0.1 µF to 1 µF ceramic decoupling to approximately 5.5V. capacitor is required. The VCC pin is an output only. 2 Submit Documentation Feedback Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Links: LM20323 |
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