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NR8040 Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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NR8040 Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 15 page RT7272B 2 DS7272B-01 January 2013 www.richtek.com Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © Functional Pin Description Function Block Diagram Pin Configurations (TOP VIEW) SOP-8 (Exposed Pad) Marking Information SW BOOT EN GND VIN RLIM FB COMP GND 2 3 4 5 6 7 8 9 RT7272BGSP : Product Number YMDNN : Date Code Pin No. Pin Name Pin Function 1 SW Switch Node Connect to external L-C filter. 2 BOOT Bootstrap Supply for High Side Gate Drive. A 100nF or greater capacitor is recommended to connect from BOOT pin to SW pin. 3 EN Enable Control Input. A logic-high enables the converter; a logic-low forces the device into shutdown mode. 4, 9 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation. 5 FB Feedback Input. This pin is connected to the converter output. It is used to set the output of the converter to regulate to the desired value via an resistive divider. 6 COMP Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND. In some cases, an additional capacitor from COMP to GND is required. 7 RLIM Current Limit Setting. Connect to a resistor to determine current limit. 8 VIN Power Input. The input voltage range is from 4.5V to 36V. Must bypass with a suitable large ceramic capacitor. VA + - + - + - UV Comparator Oscillator Foldback Control 0.4V Internal Regulator + - 1.7V Shutdown Comparator Current Sense Amplifier BOOT VIN GND SW FB EN COMP VA VCC Slope Comp Current Comparator + - EA 0.8V S R Q Q RLIM + - 1.2V Lockout Comparator VCC + 80m Ω 150m Ω RSENSE 5k Ω UV SS VCC RT7272B GSPYMDNN |
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