Datasheet LTC1879 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | 1.2A Synchronous Step-Down Regulator with 15µA Quiescent Current |
| Pages / Page | 20 / 2 — ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1). ELECTRICAL … |
| File Format / Size | PDF / 268 Kb |
| Document Language | English |
ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1). ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
Text Version of Document
LTC1879
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
ORDER PART Input Supply Voltage .. – 0.3V to 11V TOP VIEW NUMBER ITH, PLL_LPF Voltages ... –0.3V to 2.7V SGND 1 16 RUN/SS, V PLL_LPF FB Voltages ... – 0.3V to VIN RUN/SS 2 15 SYNC/MODE LTC1879EGN SYNC/MODE Voltage ... – 0.3V to VIN V 3 14 FB PGOOD (VPVIN – VSWP) Voltage... – 0.3V to 11V I 4 13 TH SVIN VSWN Voltage .. – 0.3V to 11V SWP1 5 12 SWP2 P-Channel Switch Source Current (DC) .. 2A SWN1 6 11 SWN2 GN PART N-Channel Switch Sink Current (DC) .. 2A PGND1 7 10 PGND2 MARKING Peak Switching Sink and Source Current ... 3A PV 8 9 IN1 PVIN2 Operating Ambient Temperature Range 1879 GN PACKAGE (Note 2) ... – 40°C to 85°C 16-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 140°C/ W, θJC = 40°C/ W Junction Temperature (Notes 3, 6) .. 125°C Storage Temperature Range .. – 65°C to 150°C Lead Temperature (Soldering, 10 sec)... 300°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IVFB Feedback Current (Note 4) ● 8 60 nA VFB Regulated Output Voltage (Note 4) 0°C ≤ TA ≤ 85°C 0.784 0.80 0.816 V (Note 4) – 40°C ≤ TA ≤ 85°C ● 0.740 0.80 0.840 V ∆VOVL Overvoltage Trip Limit with Respect to VFB ∆VOVL = VOVL – VFB ● 20 60 110 mV ∆VUVL Undervoltage Trip Limit with Respect to VFB ∆VUVL = VFB – VUVL ● 20 60 110 mV ∆VFB/VFB Reference Voltage Line Regulation VIN = 2.65V to 10V (Note 4) 0.05 0.25 %/V VLOADREG Output Voltage Load Regulation Measured in Servo Loop, VITH = 0.9V to 1.2V ● 0.1 0.6 % Measured in Servo Loop, VITH = 1.6V to 1.2V ● – 0.1 – 0.6 % VIN Input Voltage Range ● 2.65 10 V IQ Input DC Bias Current (Note 5) Pulse Skipping Mode 2.65V < VIN < 10V, VSYNC/MODE = 0V, IOUT = 0A 270 365 µA Burst Mode Operation VSYNC/MODE = VIN, IOUT = 0A 15 22 µA Shutdown VRUN = 0V, VIN = 10V 0 1 µA fSYNC SYNC Capture Range 350 750 kHz fOSC Oscillator Frequency VFB ≥ 0.7V 495 550 605 kHz VFB = 0V 80 kHz IPLLLPF Phase Detector Output Current Sinking Capability fPLLIN < fOSC ● 3 10 20 µA Sourcing Capability fPPLIN > fSOC ● – 3 – 10 – 20 µA RPFET RDS(ON) of P-Channel FET ISW = 100mA, VIN = 5V 0.35 0.45 Ω RNFET RDS(ON) of N-Channel FET ISW = – 100mA, VIN = 5V 0.37 0.5 Ω IPK Peak Inductor Current VFB = 0.7V, Duty Cycle < 35%, VIN = 5V 1.8 2.2 2.7 A ILSW SW Leakage VRUN = 0V, VSW = 0V or 10V, VIN = 10V ±0.01 ±2.5 µA VSYNC/MODE SYNC/MODE Threshold ● 0.2 1.0 1.5 V ISYNC/MODE SYNC/MODE Leakage Current ±0.01 ±1 µA 1879f 2
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
ORDER PART Input Supply Voltage .. – 0.3V to 11V TOP VIEW NUMBER ITH, PLL_LPF Voltages ... –0.3V to 2.7V SGND 1 16 RUN/SS, V PLL_LPF FB Voltages ... – 0.3V to VIN RUN/SS 2 15 SYNC/MODE LTC1879EGN SYNC/MODE Voltage ... – 0.3V to VIN V 3 14 FB PGOOD (VPVIN – VSWP) Voltage... – 0.3V to 11V I 4 13 TH SVIN VSWN Voltage .. – 0.3V to 11V SWP1 5 12 SWP2 P-Channel Switch Source Current (DC) .. 2A SWN1 6 11 SWN2 GN PART N-Channel Switch Sink Current (DC) .. 2A PGND1 7 10 PGND2 MARKING Peak Switching Sink and Source Current ... 3A PV 8 9 IN1 PVIN2 Operating Ambient Temperature Range 1879 GN PACKAGE (Note 2) ... – 40°C to 85°C 16-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 140°C/ W, θJC = 40°C/ W Junction Temperature (Notes 3, 6) .. 125°C Storage Temperature Range .. – 65°C to 150°C Lead Temperature (Soldering, 10 sec)... 300°C Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IVFB Feedback Current (Note 4) ● 8 60 nA VFB Regulated Output Voltage (Note 4) 0°C ≤ TA ≤ 85°C 0.784 0.80 0.816 V (Note 4) – 40°C ≤ TA ≤ 85°C ● 0.740 0.80 0.840 V ∆VOVL Overvoltage Trip Limit with Respect to VFB ∆VOVL = VOVL – VFB ● 20 60 110 mV ∆VUVL Undervoltage Trip Limit with Respect to VFB ∆VUVL = VFB – VUVL ● 20 60 110 mV ∆VFB/VFB Reference Voltage Line Regulation VIN = 2.65V to 10V (Note 4) 0.05 0.25 %/V VLOADREG Output Voltage Load Regulation Measured in Servo Loop, VITH = 0.9V to 1.2V ● 0.1 0.6 % Measured in Servo Loop, VITH = 1.6V to 1.2V ● – 0.1 – 0.6 % VIN Input Voltage Range ● 2.65 10 V IQ Input DC Bias Current (Note 5) Pulse Skipping Mode 2.65V < VIN < 10V, VSYNC/MODE = 0V, IOUT = 0A 270 365 µA Burst Mode Operation VSYNC/MODE = VIN, IOUT = 0A 15 22 µA Shutdown VRUN = 0V, VIN = 10V 0 1 µA fSYNC SYNC Capture Range 350 750 kHz fOSC Oscillator Frequency VFB ≥ 0.7V 495 550 605 kHz VFB = 0V 80 kHz IPLLLPF Phase Detector Output Current Sinking Capability fPLLIN < fOSC ● 3 10 20 µA Sourcing Capability fPPLIN > fSOC ● – 3 – 10 – 20 µA RPFET RDS(ON) of P-Channel FET ISW = 100mA, VIN = 5V 0.35 0.45 Ω RNFET RDS(ON) of N-Channel FET ISW = – 100mA, VIN = 5V 0.37 0.5 Ω IPK Peak Inductor Current VFB = 0.7V, Duty Cycle < 35%, VIN = 5V 1.8 2.2 2.7 A ILSW SW Leakage VRUN = 0V, VSW = 0V or 10V, VIN = 10V ±0.01 ±2.5 µA VSYNC/MODE SYNC/MODE Threshold ● 0.2 1.0 1.5 V ISYNC/MODE SYNC/MODE Leakage Current ±0.01 ±1 µA 1879f 2
