Datasheet LTC3569 (Analog Devices) - 4

LTC3569
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise noted (Notes 2, 7). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RPGOOD PGOOD Pull-Down On-Resistance VFBX < 0.4V 380 525 Ω UVLO Undervoltage Lockout l 2.5 V fOSC Fixed Oscillator Frequency VRT = SVIN l 1.9 2.25 2.8 MHz fCLK(MAX) Maximum Programmable Oscillator Frequency RT = 100k l 3.0 MHz fCLK(MIN) Minimum Programmable Oscillator Frequency RT = 453k l 1.0 MHz fSYNC Sync Frequency VRT = SVIN 3 MHz RT = 453k 1.2 MHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 6:
This IC includes overtemperature protection that is intended may cause permanent damage to the device. Exposure to any Absolute to protect the device during momentary overload conditions. Junction Maximum Rating condition for extended periods may affect device temperature exceeds 125°C when overtemperature protection is active. reliability and lifetime. Continuous operation above the specified maximum operating junction
Note 2:
Current into a pin is positive and current out of a pin is negative. temperature may impair device reliability. All voltages referenced to SGND.
Note 7:
The LTC3569 is tested under pulsed load conditions such that
Note 3:
Dynamic supply current is higher due to the internal gate charge TJ ≈ TA. The LTC3569E is guaranteed to meet specified performance from being delivered at the switching frequency. 0°C to 85°C. Specifications over the –40°C to 125°C operating junction
Note 4:
Specification is guaranteed by design and not 100% tested in temperature range are assured by design characterization and correlation production. with statistical process controls. The LTC3569I is guaranteed to meet specified performance over the full –40°C to 125°C operating junction
Note 5:
Switch on-resistance verified by correlation to wafer level temperature range. measurements.
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Efficiency vs Load Current Efficiency vs Load Current ISVIN vs Temperature OUT2 = 1.8V OUT3 = 1.2V
300 100 100 VIN = 3V 90 90 VIN = 3V 250 BUCK1 ONLY PULSE-SKIPPING VIN = 3.5V 80 80 70 200 70 V SLOPE ≅ 185nA/°C IN = 5V 60 60 VIN = 5V (µA) 150 50 50 I SVIN 40 40 100 EFFICIENCY (%) EFFICIENCY (%) 30 30 BUCK1 ONLY Burst Mode OPERATION 20 50 V 20 IN = 3.5V 10 Burst Mode OPERATION 10 Burst Mode OPERATION SLOPE ≅ 132nA/°C NO LOAD PULSE-SKIPPING PULSE-SKIPPING 0 0 0 –50 0 50 100 150 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 TEMPERATURE (°C) ILOAD (mA) ILOAD (mA) 3569 G01 3569 G02 3569 G03 3569fe 4 For more information www.linear.com/LTC3569 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 Package Description Revision History Typical Application Related Parts