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WM8321 数据表(PDF) 20 Page - Wolfson Microelectronics plc |
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WM8321 数据表(HTML) 20 Page - Wolfson Microelectronics plc |
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20 / 253 page  WM8321 Production Data w PD, February 2012, Rev 4.0 20 PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Low Power mode 0 50 VOUT Accuracy VOUT_ACC ILOAD = 1mA -2.5 +2.5 % Line Regulation VOUT LINE VIN = (VOUT + 0.5) to 5.5V, ILOAD = 100mA Note that VIN must be >= 1.71V 0.025 %/V Load Regulation VOUT LOAD ILOAD =1mA to 200mA 0.003 %/mA Dropout Voltage VIN - VOUT ILOAD =100mA, VOUT =1.8V 95 mV ILOAD =100mA, VOUT =2.5V 65 ILOAD =100mA, VOUT =3.3V 60 Undervoltage level VOUT VOUT Falling 93 % Quiescent Current IQ Normal mode, no load 110 A Low Power mode, no load 70 ILOAD = 1mA to 200mA IQ (no load) + 0.1% of load Power Supply Rejection Ratio PSRR ILOAD = 100mA, <= 1kHz 70 dB ILOAD = 100mA, 10kHz 67 ILOAD = 100mA, 100kHz 48 Output noise voltage VOUT f=10Hz to 100kHz; VOUT=2.8V, ILOAD = 1mA 30 VRMS f=10Hz to 100kHz; VOUT=2.8V, ILOAD = 10mA 32 f=10Hz to 100kHz; VOUT=2.8V, ILOAD = 100mA 32 On Resistance (Switch mode) RDSON VIN = 1.71V, ILOAD = 100mA 550 m VIN = 1.8V, ILOAD = 100mA 500 VIN = 2.5V, ILOAD = 100mA 330 VIN = 3.5V, ILOAD = 100mA 250 Current Limit (Switch mode) ICL VOUT = 0V 320 mA Start-up time tstart_up No load, Output cap 4.7 µF, 90% of VOUT 50 s Shutdown time tshut_down No load, Output cap 4.7 µF, 10% of VOUT 10 ms LDO9, LDO10 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 1.71 5.5 V Programmable Output Voltage VOUT 1.0 3.5 V VOUT Step Size VOUT_STEP VOUT = 1.0V to 1.6V 50 mV VOUT = 1.7V to 3.5V 100 Output Current IOUT Normal mode 0 150 mA Low Power mode 0 50 VOUT Accuracy VOUT_ACC ILOAD = 1mA -2.5 +2.5 % Line Regulation VOUT LINE VIN = (VOUT + 0.5) to 5.5V, ILOAD = 75mA Note that VIN must be >= 1.71V 0.025 %/V Load Regulation VOUT LOAD ILOAD =1mA to 150mA 0.004 %/mA Dropout Voltage VIN - VOUT ILOAD =100mA, VOUT =1.8V 135 mV ILOAD =100mA, VOUT =2.5V 100 ILOAD =100mA, VOUT =3.3V 90 Undervoltage level VOUT VOUT Falling 93 % Quiescent Current IQ Normal mode, no load 110 A Low Power mode, no load 70 ILOAD = 1mA to 150mA IQ (no load) + 0.1% of load Power Supply Rejection Ratio PSRR ILOAD = 75mA, <= 1kHz 73 dB ILOAD = 75mA, 10kHz 69 |
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