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LM2734ZSDX Arkusz danych(PDF) 11 Page - Texas Instruments

Numer części LM2734ZSDX
Szczegółowy opis  Thin SOT 1-A Load Step-Down DC-DC Regulator
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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
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