Datasheet LTC3315A (Analog Devices) - 3

link to page 2 LTC3315A
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 3). VIN = 3.3V unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Undervoltage Lockout VIN Rising l 2.05 2.15 2.25 V VIN Undervoltage Lockout Hysteresis 150 mV VIN Quiescent Current in Shutdown 1.2 2 µA VIN Quiescent Current with One Buck Enabled Burst Mode, Buck in Regulation, Sleeping 45 70 µA All Modes, Not Sleeping (Note 4) 1.5 2.3 mA VIN Quiescent Current with Both Bucks Enabled Burst Mode, Bucks in Regulation, Sleeping 70 110 µA All Modes, Not Sleeping (Note 4) 2.8 4.2 mA Enable Threshold VEN Rising l 375 400 425 mV Enable Threshold Hysteresis 50 mV EN Pin Leakage VEN = 5.5V ±20 nA
Voltage Regulation, Buck 1 and Buck 2
Regulated Feedback Voltage (VFB) l 495 500 505 mV Feedback Voltage Line Regulation 2.25V ≤ VIN ≤ 5.5V 0.015 0.05 %/V Feedback Pin Input Current VFB = 500mV ±20 nA PMOS Current Limit (ILIM) Current out of SW, VOUT/VIN ≤ 0.2 2.9 3.2 3.5 A NMOS Current Limit (IVALLEY) Current out of SW 2.4 2.7 3.0 A NMOS Reverse Current Limit Current into SW, Forced Continuous 0.5 1 1.5 A PMOS ON-Resistance 75 mΩ NMOS ON-Resistance 19 mΩ SW Leakage Current Shutdown, VIN = 5.5V ±200 nA Minimum On Time VIN = 5.5V l 25 45 ns Maximum Duty Cycle l 100 % Overtemperature Shutdown (OT) Temperature Rising (Note 5) 165 °C Overtemperature Shutdown Hysteresis 5 °C
Power Good/Soft-Start
PGOOD Rising Threshold As a Percentage of the Regulated VOUT l 97 98 99 % PGOOD Hysteresis l 0.6 1.1 1.6 % Overvoltage Rising Threshold As a Percentage of the Regulated VOUT l 107 110 114 % Overvoltage Hysteresis l 1 2.2 3.5 % PGOOD Delay 120 µs PGOOD Leakage Current VPGOOD = 5.5V 20 nA PGOOD Pull-Down Resistance VPGOOD = 0.1V 10 20 Ω Soft-Start Time (Note 6) l 0.25 1 3 ms
Oscillator and MODE/SYNC
Internal Oscillator Frequency (fSW) l 1.85 2 2.15 MHz Synchronization Frequency Range l 1 3 MHz Minimum SYNC High or Low Pulse Width l 40 ns SYNC Level High on MODE/SYNC l 1.2 V SYNC Level Low on MODE/SYNC l 0.4 V MODE/SYNC No Clock Detect Time 10 µs MODE/SYNC Pin Threshold For Programming Pulse Skipping Mode l 0.1 V For Programming Burst Mode l VIN – 0.1 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 2:
The LTC3315A is tested under pulsed load conditions such may cause permanent damage to the device. Exposure to any Absolute that TJ ≈ TA. The LTC3315AE is guaranteed to meet specifications from Maximum Rating condition for extended periods may affect device 0°C to 85°C junction temperature. Specifications over the –40°C to reliability and lifetime. 125°C operating junction temperature range are assured by design, Rev. A For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts