Datasheet LTC3827-1 (Analog Devices) - 4

HerstellerAnalog Devices
BeschreibungLow IQ, Dual, 2-Phase Synchronous Step-Down Controller
Seiten / Seite32 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply …
Dateiformat / GrößePDF / 458 Kb
DokumentenspracheEnglisch

ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating

ELECTRICAL CHARACTERISTICS The denotes the specifi cations which apply over the full operating

Modelllinie für dieses Datenblatt

Textversion des Dokuments

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