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LTC3252 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3252 Datasheet(HTML) 4 Page - Linear Technology |
4 / 12 page LTC3252 4 3252f 1.2V Output Voltage vs Supply Voltage 1.2V Efficiency vs Load Current TYPICAL PERFOR A CE CHARACTERISTICS FB1 (Pin 1): Feedback Input Pin 1. An output divider should be connected from OUT1 to FB1 to program the output voltage. EN1 (Pin 2): Input Enable Pin 1. When EN1 is high, OUT1 is enabled. When EN1 is low OUT1 is shut down. VIN (Pin 3): Input Supply Voltage. Operating VIN may be between 2.7V and 5.5V. Bypass VIN with a ≥ 4.7µF (1µF min) low ESR ceramic capacitor to GND (CIN). Oscillator Max/Min Frequency vs Supply Voltage VIN (V) 2.7 0.8 1.0 1.2 1.4 1.6 2.0 3.2 3.7 4.2 4.7 3252 G07 5.2 1.8 0.9 1.1 1.3 1.5 1.9 1.7 –40 °C MAX –40 °C MIN 25 °C MAX 25 °C MIN 85 °C MAX 85 °C MIN VIN (V) 2.7 1.30 1.28 1.26 1.24 1.22 1.20 1.18 1.16 1.14 1.12 1.10 3.2 3.7 4.2 4.7 3252 G08 5.2 IOUT = 250mA IOUT = 50mA IOUT = 0mA TA = 25°C IOUT (mA) 0.1 100 80 60 40 20 0 3252 G09 1 10 100 1000 VIN = 2.8V VIN = 4.5V VIN = 3.5V VIN = 3.1V TA = 25°C IOUT 250mA VOUT 20mV/DIV AC 3252 G11 VIN = 3.6V VOUT = 1.5V 20mA VIN 4.5V VOUT 10mV/DIV AC 3252 G12 VOUT = 1.5V IOUT = 150mA 3.5V Output Current Transient Response Line Transient Response C1+ (Pin 4): Flying Capacitor 1 Positive Terminal (C1). OUT1 (Pin 5): Regulated Output Voltage 1. OUT1 is disconnected from VIN when in shutdown. Bypass OUT1 with a low ESR ceramic capacitor to GND (CO1). See Output Capacitor Selection section for size requirements. C1– (Pin 6): Flying Capacitor 1 Negative Terminal (C1). GND (Pin 7): Ground. Connect to a ground plane for best performance. PI FU CTIO S |
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