LM2651-3.3EVAL National Semiconductor, LM2651-3.3EVAL Datasheet
LM2651-3.3EVAL
Specifications of LM2651-3.3EVAL
Related parts for LM2651-3.3EVAL
LM2651-3.3EVAL Summary of contents
Page 1
... At light loads, the LM2651 enters a low power hysteretic or “sleep” mode to keep the efficiency high. In many applications, the efficiency still exceeds 80% at 15mA load. A shutdown pin is available to disable the LM2651 and reduce the supply current to less than 10µA. The LM2651 contains a patented current sensing circuitry for current mode control ...
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... TSSOP (MTC) 10092502 Part Number Supplied as 2.5k Units, Tape and Reel LM2651MTCX-1.8 LM2651MTCX-2.5 LM2651MTCX-3.3 LM2651MTCX-ADJ Switched-node connection, which is connected with the source of the internal high-side MOSFET. Main power supply pin. Bootstrap capacitor connection for high-side gate drive. Input supply voltage for control and driver circuits. ...
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... Output Voltage Line OUT Regulation V Output Voltage Load OUT Regulation V Output Voltage Load OUT Regulation V Sleep Mode Output Voltage HYST Hysteresis LM2651-3.3 System Parameters Symbol Parameter V Output Voltage OUT V Output Voltage Line OUT Regulation V Output Voltage Load OUT Regulation V Output Voltage Load ...
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... LM2651-ADJ System Parameters (V = 2.5V unless otherwise specified) OUT Symbol Parameter V Feedback Voltage FB V Output Voltage Line OUT Regulation V Output Voltage Load OUT Regulation V Output Voltage Load OUT Regulation V Sleep Mode Output Voltage HYST Hysteresis All Output Voltage Versions Specifications in standard type face are for T perature range ...
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... A JA allows the safe dissipation of more power. The Absolute Maximum power dissipation must be derated by 7.14mW per ˚C above 25˚C ambient. The LM2651 actively limits its junction temperature to about 165˚C. Note 3: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. ...
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Typical Performance Characteristics I vs Input Voltage Junction Temperature QSD R vs Input Voltage DS(ON) www.national.com 10092505 10092507 R DS(ON) 10092509 Input Voltage QSD 10092506 Frequency vs Junction Temperature 10092508 vs Junction Temperature 10092510 ...
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Typical Performance Characteristics Current Limit vs Input Voltage (V =2.5V) OUT Current Limit vs Junction Temperature (V = 3.3V) OUT Sleep Mode Threshold vs Output Voltage For ADJ version (V IN (Continued) 10092511 10092513 = 5V) 10092525 7 Current Limit ...
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... Block Diagram Operation The LM2651 operates in a constant frequency (300 kHz), current-mode PWM for moderate to heavy loads; and it automatically switches to hysteretic mode for light loads. In hysteretic mode, the switching frequency is reduced to keep the efficiency high. MAIN OPERATION When the load current is higher than the sleep mode thresh- old, the part is always operating in PWM mode ...
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... OUT and V and V IN OUT The total loop gain G is approximately 500 amperes amplifier is used inside the LM2651. The output resis- tor R of the Gm amplifier is about 80kΩ together with R give a lag compensation to roll off the gain 1/(2πC pc1 ...
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Design Procedure (Continued) EXTERNAL SCHOTTKY DIODE A Schottky diode D is recommended to prevent the intrinsic 1 body diode of the low-side MOSFET from conducting during the deadtime in PWM operation and hysteretic mode when both MOSFETs are off. If ...
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