Datasheet LTC3834-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 30μA IQ Synchronous Step-Down Controller |
| Pages / Page | 28 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 300 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LTC3834-1
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; I TH Voltage = 1.2V to 0.7V ● 0.1 0.5 % Measured in Servo Loop; I TH Voltage = 1.2V to 2V ● – 0.1 – 0.5 % gm Transconductance Amplifier gm ITH = 1.2V; Sink/Source 5μA (Note 4) 0.5 mmho IQ Input DC Supply Current (Note 5) Sleep Mode RUN = 5V, VFB = 0.83V (No Load) 30 50 μA Shutdown VRUN = 0V 4 10 μA UVLO Undervoltage Lockout VIN Ramping Down ● 3.7 4 V VOVL Feedback Overvoltage Lockout Measured at VFB Relative to Regulated VFB 8 10 12 % ISENSE Sense Pins Total Source Current VSENSE– = VSENSE+ = 0V –220 μA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRACK/SS Soft-Start Charge Current VTRACK = 0V 0.85 1.1 1.45 μA VRUN ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 0.5 0.7 0.9 V VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE– = 3.3V ● 85 100 115 mV TG Transition Time: (Note 6) TG1, 2 tr Rise Time CLOAD = 3300pF 50 90 ns TG1, 2 tf Fall Time CLOAD = 3300pF 50 90 ns BG Transition Time: (Note 6) BG1, 2 tr Rise Time CLOAD = 3300pF 40 90 ns BG1, 2 tf Fall Time CLOAD = 3300pF 40 80 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF 70 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF 70 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time (Note 7) 200 ns
INTVCC Linear Regulator
VINTVCCVIN Internal VCC Voltage 8.5V < VIN < 30V 5.0 5.25 5.5 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 20mA 0.2 1.0 %
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VPLLLPF = No Connect 360 400 440 kHz fLOW Lowest Frequency VPLLLPF = 0V 220 250 280 kHz fHIGH Highest Frequency VPLLLPF = INTVCC 475 530 580 kHz fSYNCMIN Minimum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 0V 115 140 kHz fSYNCMAX Maximum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 2V 650 800 kHz IPLLLPF Phase Detector Output Current Sinking Capability fPLLIN/MODE < fOSC –5 μA Sourcing Capability fPLLIN/MODE > fOSC 5 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings may
Note 4:
The LTC3834-1 is tested in a feedback loop that servos VITH to a cause permanent damage to the device. Exposure to any Absolute Maximum specified voltage and measures the resultant VFB. Rating condition for extended periods may affect device reliability and lifetime.
Note 5:
Dynamic supply current is higher due to the gate charge being
Note 2:
The LTC3834E-1 is guaranteed to meet performance specifications delivered at the switching frequency. See Applications Information. from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay range are assured by design, characterization and correlation with statistical times are measured using 50% levels. process controls. The LTC3834I-1 is guaranteed to meet performance
Note 7:
The minimum on-time condition is specified for an inductor specifications over the –40°C to 85°C operating temperature range. peak-to-peak ripple current 40% of IMAX (see Minimum On-Time
Note 3:
TJ is calculated from the ambient temperature TA and power Considerations in the Applications Information section). dissipation PD according to the following formulas: LTC3834GN-1: TJ = TA + (PD • 90°C/W) LTC3834DHC-1: TJ = TA + (PD • 43.5°C/W) 38341f 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; I TH Voltage = 1.2V to 0.7V ● 0.1 0.5 % Measured in Servo Loop; I TH Voltage = 1.2V to 2V ● – 0.1 – 0.5 % gm Transconductance Amplifier gm ITH = 1.2V; Sink/Source 5μA (Note 4) 0.5 mmho IQ Input DC Supply Current (Note 5) Sleep Mode RUN = 5V, VFB = 0.83V (No Load) 30 50 μA Shutdown VRUN = 0V 4 10 μA UVLO Undervoltage Lockout VIN Ramping Down ● 3.7 4 V VOVL Feedback Overvoltage Lockout Measured at VFB Relative to Regulated VFB 8 10 12 % ISENSE Sense Pins Total Source Current VSENSE– = VSENSE+ = 0V –220 μA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRACK/SS Soft-Start Charge Current VTRACK = 0V 0.85 1.1 1.45 μA VRUN ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 0.5 0.7 0.9 V VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE– = 3.3V ● 85 100 115 mV TG Transition Time: (Note 6) TG1, 2 tr Rise Time CLOAD = 3300pF 50 90 ns TG1, 2 tf Fall Time CLOAD = 3300pF 50 90 ns BG Transition Time: (Note 6) BG1, 2 tr Rise Time CLOAD = 3300pF 40 90 ns BG1, 2 tf Fall Time CLOAD = 3300pF 40 80 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF 70 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF 70 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time (Note 7) 200 ns
INTVCC Linear Regulator
VINTVCCVIN Internal VCC Voltage 8.5V < VIN < 30V 5.0 5.25 5.5 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 20mA 0.2 1.0 %
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VPLLLPF = No Connect 360 400 440 kHz fLOW Lowest Frequency VPLLLPF = 0V 220 250 280 kHz fHIGH Highest Frequency VPLLLPF = INTVCC 475 530 580 kHz fSYNCMIN Minimum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 0V 115 140 kHz fSYNCMAX Maximum Synchronizable Frequency PLLIN/MODE = External Clock; VPLLLPF = 2V 650 800 kHz IPLLLPF Phase Detector Output Current Sinking Capability fPLLIN/MODE < fOSC –5 μA Sourcing Capability fPLLIN/MODE > fOSC 5 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings may
Note 4:
The LTC3834-1 is tested in a feedback loop that servos VITH to a cause permanent damage to the device. Exposure to any Absolute Maximum specified voltage and measures the resultant VFB. Rating condition for extended periods may affect device reliability and lifetime.
Note 5:
Dynamic supply current is higher due to the gate charge being
Note 2:
The LTC3834E-1 is guaranteed to meet performance specifications delivered at the switching frequency. See Applications Information. from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay range are assured by design, characterization and correlation with statistical times are measured using 50% levels. process controls. The LTC3834I-1 is guaranteed to meet performance
Note 7:
The minimum on-time condition is specified for an inductor specifications over the –40°C to 85°C operating temperature range. peak-to-peak ripple current 40% of IMAX (see Minimum On-Time
Note 3:
TJ is calculated from the ambient temperature TA and power Considerations in the Applications Information section). dissipation PD according to the following formulas: LTC3834GN-1: TJ = TA + (PD • 90°C/W) LTC3834DHC-1: TJ = TA + (PD • 43.5°C/W) 38341f 3
