Datasheet LTC3411A (Analog Devices) - 3

LTC3411A
elecTrical characTerisTics The
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denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C, VIN = 3.6V, RT = 125k unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IS Input DC Supply Current (Note 4) Active Mode VSYNC/MODE = 3.6V, VFB = 0.75V 330 450 µA Sleep Mode VSYNC/MODE = 3.6V, VFB = 0.84V 40 60 µA Shutdown VSHDN/RT = 3.6V 0.1 1 µA VSHDN/RT Shutdown Threshold High Active VIN – 0.6 VIN – 0.4 V Oscillator Resistor 125k 1M Ω fOSC Oscillator Frequency RT = 125k 2.25 2.5 2.8 MHz (Note 7) 4 MHz fSYNC Synchronization Frequency (Note 7) 0.4 4 MHz ILIM Peak Switch Current Limit VFB = 0.5V 1.6 2.1 2.6 A RDS(ON) Top Switch On-Resistance MS Package 0.15 0.18 Ω DD Package (Note 6) 0.15 Ω Bottom Switch On-Resistance MS Package 0.13 0.16 Ω DD Package (Note 6) 0.13 Ω ISW(LKG) Switch Leakage Current VIN = 5.5V, VSHDN/RT = 5.5V, VSW = 0V 0.01 1 µA or 5.5V VUVLO Undervoltage Lockout Threshold VIN Ramping Down 1.8 2.1 2.4 V PGOOD Power Good Threshold VFB Ramping Up from 0.68V to 0.8V –5 –7 % VFB Ramping Down from 0.92V to 0.8V 5 7 % Power Bad Threshold VFB Ramping Down from 0.8V to 0.68V –10 –12 % VFB Ramping Up from 0.8V to 0.9V 10 12 % RPGOOD Power Good Pull-Down On-Resistance 15 30 Ω PGOOD Blanking VFB Step from 0V to 0.8V 40 µs VFB Step from 0.8V to 0V 105 µs VSYNC-MODE Pulse Skip VIN = 2.5V to 5.5V 0.6 V Force Continuous VIN = 2.5V to 5.5V 1.2 VIN – 1.1 V Burst VIN = 2.5V to 5.5V VIN – 0.6 V tSOFT-START 10% to 90% of Regulation 0.5 0.8 1.0 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
Dynamic supply current is higher due to the internal gate charge may cause permanent damage to the device. Exposure to any Absolute being delivered at the switching frequency. Maximum Rating condition for extended periods may affect device
Note 5:
TJ is calculated from the ambient TA and power dissipation PD reliability and lifetime. according to the following formulas:
Note 2:
The LTC3411A is tested under pulsed load conditions such that LTC3411AEDD: TJ = T A + (PD • 43°C/W) TJ ≈ TA. The LTC3411AE is guaranteed to meet performance specifications LTC3411AEMS: T from 0°C to 85°C junction temperature. Specifications over the –40°C J = T A + (PD • 120°C/W) to 125°C operating junction temperature range are assured by design,
Note 6:
For the DD package, switch on-resistance is sampled at wafer level characterization and correlation with statistical process controls. The measurements and assured by design, characterization and correlation LTC3411AI is guaranteed over the full –40°C to 125°C operating junction with statistical process controls. temperature range. The maximum ambient temperature consistent with
Note 7:
4MHz operation is guaranteed by design but not production tested these specifications is determined by specific operating conditions in and is subject to duty cycle limitations (see Applications Information). conjunction with board layout, the rated package thermal resistance and
Note 8:
This IC includes overtemperature protection that is intended other environmental factors. to protect the device during momentary overload conditions. Junction
Note 3:
The LTC3411A is tested in a feedback loop which servos V temperature will exceed 125°C when overtemperature protection is active. FB to the midpoint for the error amplifier (V Continuous operation above the specified maximum operating junction ITH = 0.7V). temperature may impair device reliability. 3411afd For more information www.linear.com/LTC3411A 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Revision History Typical Application Related Parts