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LM25005 Scheda tecnica(PDF) 3 Page - Texas Instruments |
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LM25005 Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 28 page LM25005 www.ti.com SNVS411C – JANUARY 2006 – REVISED MARCH 2013 PIN DESCRIPTIONS (continued) Pin(S) Name Description Application Information Current measurement connection for the re-circulating diode. An internal sense resistor and a sample/hold circuit sense the diode 15, 16 IS Current sense current near the conclusion of the off-time. This current measurement provides the DC level of the emulated current ramp. The source terminal of the internal buck switch. The SW pin 17, 18 SW Switching node should be connected to the external Schottky diode and to the buck inductor. This open drain output can be connected to SW pin to aid charging the bootstrap capacitor during very light load conditions Pre-charge assist for the bootstrap or in applications where the output may be pre-charged before 19 PRE capacitor the LM25005 is enabled. An internal pre-charge MOSFET is turned on for 250ns each cycle just prior to the on-time interval of the buck switch. An external capacitor is required between the BST and the SW pins. A 0.022µF ceramic capacitor is recommended. The 20 BST Boost input for bootstrap capacitor capacitor is charged from Vcc via an internal diode during the off-time of the buck switch. Exposed metal pad on the underside of the device. It is NA EP Exposed Pad recommended to connect this pad to the PWB ground plane, in order to aid in heat dissipation. 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. Absolute Maximum Ratings (1) (2) VIN to GND 45V BST to GND 60V PRE to GND 45V SW to GND (Steady State) -1.5V BST to VCC 45V VCC to GND 14V BST to SW 14V OUT to GND Limited to Vin SD, SYNC, SS, FB to GND 7V ESD Rating(3) Human Body Model 2kV Storage Temperature Range -65°C to +150°C (1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics . (2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications. (3) The human body model is a 100pF capacitor discharged through a 1.5k Ω resistor into each pin. Operating Ratings (1) VIN 7V to 42V Operation Junction Temperature −40°C to + 125°C (1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics . Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM25005 |
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