Datasheet LTC3827-1 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Low IQ, Dual, 2-Phase Synchronous Step-Down Controller |
| Pages / Page | 32 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 458 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LTC3827-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 12V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
fLOW Lowest Frequency VPLLLPF = 0V; PLLIN/MODE = DC Voltage 220 250 280 kHz fHIGH Highest Frequency VPLLLPF = INTVCC; PLLIN/MODE = DC Voltage 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
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA VPG PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –12 –10 –8 % VFB Ramping Positive 8 10 12 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3827-1 is tested in a feedback loop that servos VITH1, 2 to may cause permanent damage to the device. Exposure to any Absolute a specifi ed voltage and measures the resultant VFB1, 2. Maximum Rating condition for extended periods may affect device
Note 5:
Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3827E-1 is guaranteed to meet performance specifi cations
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating times are measured using 50% levels. temperature range are assured by design, characterization and correlation
Note 7:
The minimum on-time condition is specifi ed for an inductor with statistical process controls. The LTC3827I-1 is guaranteed to meet peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time performance specifi cations over the –40°C to 85°C operating temperature considerations in the Applications Information section). range.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 95 °C/W)
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency and Power Loss vs Output Current Effi ciency vs Load Current Effi ciency vs Input Voltage
100 10000 100 98 Burst Mode OPERATION VIN = 12V 90 FORCED CONTINUOUS MODE VIN = 5V PULSE SKIPPING MODE 96 90 VOUT = 3.3V 80 1000 POWER LOSS (mW) 94 70 80 60 100 92 50 70 90 40 10 88 EFFICIENCY (%) EFFICIENCY (%) 60 EFFICIENCY (%) 30 VIN = 12V VOUT = 3.3V 86 20 1 50 10 84 VOUT = 3.3V 0 0.1 40 82 0.001 0.01 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 LOAD CURRENT (mA) LOAD CURRENT (mA) INPUT VOLTAGE (V) 38271 G01 38271 G02 38271 G03 38271fe 4
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 12V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
fLOW Lowest Frequency VPLLLPF = 0V; PLLIN/MODE = DC Voltage 220 250 280 kHz fHIGH Highest Frequency VPLLLPF = INTVCC; PLLIN/MODE = DC Voltage 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
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA VPG PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –12 –10 –8 % VFB Ramping Positive 8 10 12 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3827-1 is tested in a feedback loop that servos VITH1, 2 to may cause permanent damage to the device. Exposure to any Absolute a specifi ed voltage and measures the resultant VFB1, 2. Maximum Rating condition for extended periods may affect device
Note 5:
Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3827E-1 is guaranteed to meet performance specifi cations
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating times are measured using 50% levels. temperature range are assured by design, characterization and correlation
Note 7:
The minimum on-time condition is specifi ed for an inductor with statistical process controls. The LTC3827I-1 is guaranteed to meet peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time performance specifi cations over the –40°C to 85°C operating temperature considerations in the Applications Information section). range.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 95 °C/W)
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency and Power Loss vs Output Current Effi ciency vs Load Current Effi ciency vs Input Voltage
100 10000 100 98 Burst Mode OPERATION VIN = 12V 90 FORCED CONTINUOUS MODE VIN = 5V PULSE SKIPPING MODE 96 90 VOUT = 3.3V 80 1000 POWER LOSS (mW) 94 70 80 60 100 92 50 70 90 40 10 88 EFFICIENCY (%) EFFICIENCY (%) 60 EFFICIENCY (%) 30 VIN = 12V VOUT = 3.3V 86 20 1 50 10 84 VOUT = 3.3V 0 0.1 40 82 0.001 0.01 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 100 1000 10000 0 5 10 15 20 25 30 35 40 LOAD CURRENT (mA) LOAD CURRENT (mA) INPUT VOLTAGE (V) 38271 G01 38271 G02 38271 G03 38271fe 4
