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WM8311 データシート(PDF) 21 Page - Wolfson Microelectronics plc |
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WM8311 データシート(HTML) 21 Page - Wolfson Microelectronics plc |
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21 / 302 page  Pre-Production WM8311 w PP, May 2012, Rev 3.1 21 PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Dropout Voltage VIN - VOUT ILOAD =100mA, VOUT > 2.7V 200 mV ILOAD =100mA, VOUT 1.8V to 2.7V 250 ILOAD =100mA, VOUT < 1.8V 400 Undervoltage level VOUT VOUT Falling 88 % Quiescent Current IQ Normal mode, no load 30 A Low power mode, LDOn_LP_MODE=0, no load 10 Low power mode, LDOn_LP_MODE=1, no load 5 ILOAD = 1mA to 200mA IQ (no load) + 1% of load Power Supply Rejection Ratio PSRR ILOAD = 100mA, <= 1kHz 55 dB ILOAD = 100mA, 10kHz 55 ILOAD = 100mA, 100kHz 32 On Resistance (Switch mode) RDSON VIN = 1.5V, ILOAD = 100mA 1.5 VIN = 1.8V, ILOAD = 100mA 1.2 VIN = 2.5V, ILOAD = 100mA 0.85 VIN = 3.3V, ILOAD = 100mA 0.7 Current Limit (Switch mode) ICL VOUT = 0V 400 mA Start-up time tstart_up No load, Output cap 2.2 µF, 90% of VOUT 10 s Shutdown time tshut_down No load, Output cap 2.2 µF, 10% of VOUT 10 ms LDO4, LDO5 Unless otherwise noted: VIN = 3.8V, VOUT = 1.8V, TJ = -40°C to +125°C; Typical values are at TJ = +25ºC PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Input Voltage VIN VIN ≤ SYSVDD 1.5 5.5 V Programmable Output Voltage VOUT 0.9 3.3 V VOUT Step Size VOUT_STEP VOUT = 0.9V to 1.6V 50 mV VOUT = 1.7V to 3.3V 100 Output Current IOUT Normal mode 0 100 mA Low power mode, LDOn_LP_MODE=0 0 50 Low power mode, LDOn_LP_MODE=1 0 20 VOUT Accuracy VOUT_ACC ILOAD = 1mA -3 +3 % Line Regulation VOUT LINE VIN = (VOUT + 0.5) to 5.5V, ILOAD = 50mA Note that VIN must be >= 1.5V 0.1 %/V Load Regulation VOUT LOAD ILOAD =1mA to 100mA 0.025 %/mA Dropout Voltage VIN - VOUT ILOAD =100mA, VOUT > 2.7V 200 mV ILOAD =100mA, VOUT 1.8V to 2.7V 250 ILOAD =100mA, VOUT < 1.8V 400 Undervoltage level VOUT VOUT Falling 88 % Quiescent Current IQ Normal mode, no load 30 A Low power mode, LDOn_LP_MODE=0, no load 10 Low power mode, LDOn_LP_MODE=1, no load 5 ILOAD = 1mA to 100mA IQ (no load) + 1% of load Power Supply Rejection Ratio PSRR ILOAD = 50mA, <= 1kHz 55 dB ILOAD = 50mA, 10kHz 55 ILOAD = 50mA, 100kHz 32 On Resistance (Switch mode) RDSON VIN = 1.5V, ILOAD = 100mA 3.2 VIN = 1.8V, ILOAD = 100mA 2.1 VIN = 2.5V, ILOAD = 100mA 1.35 VIN = 3.3V, ILOAD = 100mA 1.1 |
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