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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LTC3246 데이터시트(HTML) 3 Page - Analog Devices |
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LTC3246 데이터시트(HTML) 3 Page - Analog Devices |
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LTC3246 3 3246fa For more information www.linear.com/LTC3246 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IADJ VOUTS/ADJ Input Current SEL1 = SEL2 = VIN l –50 0 +50 nA IOUT_SCKT IVOUT Short Circuit Foldback Current VOUT = 0V 250 mA ROUT Charge Pump Output Impedance 2:1 Step-Down Mode 1:1 Step-Down Mode, VIN = 5.5V 1:2 Step-Up Mode, VIN = 3V, VOUT ≥ 3.3V (Note 6) l 1 1.2 4 8 VOUT_OV_RST VOUT Overvoltage Reset % of Final Regulation Voltage at Which VOUT Rising Makes RST Go Low VOUT Falling Makes RST Go Hi-Z l l 106 109 108.5 111.5 % % VOUT_UV_RST VOUT Undervoltage Reset % of Final Regulation Voltage at Which VOUT Rising Makes RST Go Hi-Z VOUT Falling Makes RST Go Low l l 93 97.5 95 99 % % VOUT_PD VOUT Pull-Down in Shut Down SEL1 = SEL2 = 0V 100 k VOUT_RIPPLE VOUT Ripple Voltage COUT = 10µF COUT = 22µF 50 25 mV mV Reset Timer Control Pin (RT) IRT(UP) RT Pull-Up Current VRT = 0.3V l –2 –3.1 –4.2 µA IRT(DOWN) RT Pull-Down Current VRT = 1.3V l 2 3.1 4.2 µA IRT(INT) Internal RT Detect Current VRT = VBIAS l 0.4 1 µA VRT(INT) RT Internal Timer Threshold VRT Rising l 2.0 2.4 2.65 V Reset Timer Input (RSTI) VRSTI_H RSTI Input High Voltage l 1.22 1.27 V VRSTI_L RSTI Input Low Voltage l 1.04 1.2 V IRSTI_H RSTI Input High Current RSTI = 5V l –1 0 1 µA IRSTI_L RSTI Input Low Current RSTI = 0V l –1 0 1 µA Reset Timing tRST(INT) Internal Reset Timeout Period VRT = VBIAS 150 200 270 ms tRST(EXT) Adjustable Reset Timeout Period CRT = 2.2nF l 14 21 28 ms tRSTIL RSTI Low to RST Asserted l 5 20 40 µs Reset Output (RST) VOL(RST) Output Voltage Low RST IRST = 2mA l 0.1 0.4 V IOH(RST) RST Output Voltage High Leakage VRST = 5V l –1 0 1 µA Watchdog Timing tWDU(INT) Internal Watchdog Upper Boundary VWT = VBIAS l 1.2 1.6 2.2 s tWDL(INT) Internal Watchdog Lower Boundary VWT = VBIAS l 37.5 50 68 ms tWDR(EXT) External Watchdog Timeout Period CWT = 2.2nF l 100 160 220 ms tWDU(EXT) External Watchdog Upper Boundary l tWDR(EXT) • (128/129) ms tWDL(EXT) External Watchdog Lower Boundary l tWDR(EXT) • (5/129) ms Watchdog Timer Input (WDI) VIH WDI Input High Voltage l 1.1 1.6 V VOL WDI Input Low Voltage l 0.4 0.8 V IIH WDI Input High Current VWDI = 38V l –1 0 1 µA IIL WDI Input Low Current VWDI = 0V l –1 0 1 µA tPW(WDI) Input Pulsewidth l 400 ns The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, CFLY = 2.2µF, COUT = 10µF, unless otherwise noted. |
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