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LM2734ZSDX 데이터시트(PDF) 11 Page - Texas Instruments |
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LM2734ZSDX 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 36 page LM2734Z, LM2734Z-Q1 www.ti.com SNVS334F – JANUARY 2005 – REVISED JANUARY 2016 Feature Description (continued) 7.3.5 Undervoltage Lockout Undervoltage lockout (UVLO) prevents the LM2734Z from operating until the input voltage exceeds 2.74 V (typical). The UVLO threshold has approximately 440 mV of hysteresis, so the part operates until VIN drops below 2.3 V (typical). Hysteresis prevents the part from turning off during power up if VIN is non-monotonic. 7.3.6 Current Limit The LM2734Z uses cycle-by-cycle current limiting to protect the output switch. During each switching cycle, a current limit comparator detects if the output switch current exceeds 1.7 A (typical), and turns off the switch until the next switching cycle begins. 7.4 Device Functional Modes 7.4.1 Enable Pin and Shutdown Mode The LM2734Z has a shutdown mode that is controlled by the enable pin (EN). When a logic low voltage is applied to EN, the part is in shutdown mode and its quiescent current drops to typically 30 nA. Switch leakage adds another 40 nA from the input supply. The voltage at this pin must never exceed VIN + 0.3 V. 7.4.2 Thermal Shutdown Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 165°C. After thermal shutdown occurs, the output switch doesn’t turn on until the junction temperature drops to approximately 150°C. Copyright © 2005–2016, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2734Z LM2734Z-Q1 |
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