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LM5010AMH/NOPB Datasheet(PDF) 2 Page - Texas Instruments |
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LM5010AMH/NOPB Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 25 page  SW BST NC NC NC NC RTN FB SS 11 10 9 5 4 3 2 1 6 7 8 12 13 14 VCC VIN RON/SD SGND ISEN SW BST RTN VCC FB SS VIN 10 9 8 7 6 5 4 3 2 1 RON/SD SGND ISEN LM5010A LM5010A-Q1 SNVS376E – OCTOBER 2005 – REVISED FEBRUARY 2013 www.ti.com Connection Diagram Table 1. PIN DESCRIPTIONS Pin Number Name Description Application Information WSON-10 HTSSOP- 14 1 2 SW Switching Node Internally connected to the buck switch source. Connect to the inductor, free-wheeling diode, and bootstrap capacitor. 2 3 BST Boost pin for bootstrap Connect a capacitor from SW to the BST pin. The capacitor is capacitor charged from VCC via an internal diode during the buck switch off-time. 3 4 ISEN Current sense During the buck switch off-time, the inductor current flows through the internal sense resistor, and out of the ISEN pin to the free-wheeling diode. The current limit comparator keeps the buck switch off if the ISEN current exceeds 1.25A (typical). 4 5 SGND Current Sense Ground Recirculating current flows into this pin to the current sense resistor. 5 6 RTN Circuit Ground Ground return for all internal circuitry other than the current sense resistor. 6 9 FB Voltage feedback input from Input to both the regulation and over-voltage comparators. The the regulated output FB pin regulation level is 2.5V. 7 10 SS Softstart An internal 11.5 µA current source charges the SS pin capacitor to 2.5V to soft-start the reference input of the regulation comparator. 8 11 RON/SD On-time control and shutdown An external resistor from VIN to the RON/SD pin sets the buck switch on-time. Grounding this pin shuts down the regulator. 9 12 VCC Output of the bias regulator The voltage at VCC is nominally equal to VIN for VIN < 8.9V, and regulated at 7V for VIN > 8.9V. Connect a 0.47 µF, or larger capacitor from VCC to ground, as close as possible to the pins. An external voltage can be applied to this pin to reduce internal dissipation if VIN is greater than 8.9V. MOSFET body diodes clamp VCC to VIN if VCC > VIN. 10 13 VIN Input supply voltage Nominal input range is 6V to 75V. Input bypass capacitors should be located as close as possible to the VIN pin and RTN pins. 1,7,8,14 NC No connection No internal connection. Can be connected to ground plane to improve heat dissipation. EP Exposed Pad Exposed metal pad on the underside of the device. It is recommended to connect this pad to the PC board ground plane to aid in heat dissipation. 2 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM5010A LM5010A-Q1 |
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