Datasheet LTC3834 (Analog Devices) - 4

LTC3834
ELECTRICAL CHARACTERISTICS The
l
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 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 LTC3834 is tested in a feedback loop that servos VITH to a may cause permanent damage to the device. Exposure to any Absolute specified voltage and measures the resultant VFB. 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 LTC3834E is guaranteed to meet performance specifications
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay from 0°C to 85°C. Specifications over the –40°C to 85°C operating times are measured using 50% levels. temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3834I is guaranteed to meet
Note 7:
The minimum on-time condition is specified for an inductor performance specifications over the –40°C to 85°C operating temperature peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time range. Considerations in the Applications Information section).
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC3834FE: TJ = TA + (PD • 35°C/W) LTC3834UFD: TJ = TA + (PD • 37°C/W)
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency and Power Loss vs Output Current Efficiency vs Load Current Efficiency vs Input Voltage
100 10000 98 Burst Mode OPERATION 100 VIN = 12V VOUT = 3.3V 90 FORCED CONTINUOUS MODE VIN = 5V 96 FIGURE 11 CIRCUIT PULSE SKIPPING MODE 90 80 1000 VOUT = 3.3V VIN = 12V 94 V POWER LOSS (mW) 70 OUT = 3.3V 80 92 60 100 90 50 70 88 40 10 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 86 30 60 20 1 84 50 10 82 FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT 0 0.1 40 80 0.000001 0.0001 0.01 1 0.000001 0.0001 0.01 1 0 5 10 15 20 25 30 35 40 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3834 G01 3834 G02 3834 G03 3834fc 4 For more information www.linear.com/LTC3834 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Package Description Typical Application Related Parts