Datasheet LTC3569 (Analog Devices) - 3

LTC3569
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise noted (Notes 2, 7). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SVIN Input Supply Voltage l 2.5 5.5 V IVIN Input Current Pulse-Skipping Mode EN1 = SVIN, EN2, EN3 = MODE = 0V, 230 365 µA IOUT1, = 0A, FB1 = 0.9V (Note 3) Input Current Burst Mode Operation EN1 = MODE = SVIN, EN2, EN3 = 0V, 47 82 µA IOUT1, = 0A, FB1 = 0.9V (Note 3) IQX Additional Input Current per Buck, MODE = 0V, IOUTX, = 0A, FBx = 0.9V 140 225 µA Pulse Skipping (Note 3) Additional Input Current per Buck, MODE = SVIN, IOUTX, = 0A, 22 36 µA Burst Mode Operation FBx = 0.9V (Note 3) IQSHDN Quiescent Current in Shutdown Mode EN1, EN2, EN3 = 0V 0.1 1 µA VSW1 = VSW2 = VSW3 = 0V IPK1 Peak Inductor Current SW1 1.8 2.0 2.5 A IPK2, IPK3 Peak Inductor Current SW2, SW3 0.780 1.0 1.3 A VFBX(MAX) Maximum Feedback Voltage l 0.784 0.8 0.816 V VFBX(STEP) Feedback Reference Step Size Each Toggle on ENx 25 mV VFBX(MIN) Minimum Feedback Voltage ENx Toggle 15 Times l 0.405 0.425 0.44 V VPROGFBX Feedback Programming Range 0.425 0.8 V IFBX Feedback Pin Input Current VFB = 0.8V l ±0.2 µA ILKSWX Switch Pin Leakage Current VSWX = 1.8V, VENX = SVIN, ±1 µA VFBX = 0.9V DX Maximum Duty Cycle FBx = 0V 100 % RP1 RDSON of PSW for SW1 ISW1 = 100mA (Note 5) 195 mΩ RN1 RDSON of NSW for SW1 ISW1 = –100mA (Note 5) 180 mΩ RP2, RP3 RDSON of PSW for SW2, SW3 ISW2, ISW3 = 100mA (Note 5) 265 mΩ RN2, RN3 RDSON of NSW for SW2, SW3 ISW2, ISW3 = –100mA (Note 5) 250 mΩ RSWx_PD SWx Pull-Down in Shutdown ENx = 0V, VSWX = 1.2V, 2.3 kΩ (FBx < SVIN ) ∆VLINEREG Reference Voltage Line Regulation SVIN = 2.5V to 5.5V 0.04 0.2 %/V ∆VLOADREG Output Voltage Load Regulation Pulse-Skipping Mode (Note 4) 0.5 % tSS Soft-Start Reference Ramp Rate 0.75 V/ms tEN Enable Turn-On Delay From Last ENx Rise to Begin of 125 240 µs Soft-Start Ramp tOFF Enable Turn-Off Delay From ENx Fall to Shutdown 170 330 µs tPW Enable Pulse Width 0.06 55 µs IENX Enable Leakage Current VENX = 3.6V 0.02 µA IMODE Mode Leakage Current VMODE = 3.6V 0.02 µA VIL Input Low Voltage MODE, ENx 0.4 V VIH Input High Voltage MODE, ENx 1.2 V TMODEPW Pulse Width Applied to MODE Pin for 100 ns Synchronizing PGOOD Power Good Threshold VFBX Ramping Up –8 % VFBX Ramping Down –12 % TPGOOD PGOOD Delay Turn-On 8 µs Turn-Off 2 µs 3569fe For more information www.linear.com/LTC3569 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts