Datasheet LT3959 (Analog Devices) - 4

LT3959
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, EN/UVLO = 12V, INTVCC = 4.75V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
SYNC Input Low l 0.4 V SYNC Input High l 1.5 V SS Pull-Up Current SS = 0V, Current Out of Pin l –14 –10.5 –7 µA
Low Dropout Regulators (DRIVE LDO and VIN LDO)
DRIVE LDO Regulation Voltage DRIVE = 6V, Not Switching l 4.6 4.75 4.9 V VIN LDO Regulation Voltage DRIVE = 0V, Not Switching l 3.6 3.75 3.9 V DRIVE LDO Current Limit INTVCC = 4V 60 mA VIN LDO Current Limit DRIVE = 0V, INTVCC = 3V 60 mA DRIVE LDO Load Regulation (∆VINTVCC/VINTVCC) 0 < IINTVCC < 20mA, DRIVE = 6V –1 –0.6 % VIN LDO Load Regulation (∆VINTVCC/VINTVCC) DRIVE = 0V, 0 < IINTVCC < 20mA –1 –0.6 % DRIVE LDO Line Regulation [∆VINTVCC/(VINTVCC • ∆VIN)] 1.6V < VIN < 40V, DRIVE = 6V 0.03 0.07 %/V VIN LDO Line Regulation [∆VINTVCC/(VINTVCC • ∆VIN)] DRIVE = 0V, 5V < VIN < 40V 0.03 0.07 %/V DRIVE LDO Dropout Voltage (VDRIVE – VINTVCC) DRIVE = 4V, IINTVCC = 20mA l 190 400 mV VIN LDO Dropout Voltage (VIN – VINTVCC) VIN = 3V, DRIVE = 0V, l 190 400 mV IINTVCC = 20mA INTVCC Undervoltage Lockout Threshold Falling l 1.85 2.0 2.15 V INTVCC Undervoltage Lockout Threshold Rising l 2.15 2.3 2.45 V INTVCC Current in Shutdown EN/UVLO = 0V 25 µA
Logic
EN/UVLO Threshold Voltage Falling l 1.17 1.22 1.27 V EN/UVLO Threshold Voltage Rising Hysteresis 20 mV EN/UVLO Input Low Voltage IVIN < 1μA 0.4 V EN/UVLO Pin Bias Current Low EN/UVLO = 1.15V 1.8 2.2 2.6 µA EN/UVLO Pin Bias Current High EN/UVLO = 1.30V 10 100 nA FBX Power Good Threshold Voltage FBX > 0V, PGOOD Falling VFBX(REG) – 0.08 V FBX < 0V, PGOOD Falling VFBX(REG) + 0.04 V FBX Overvoltage Threshold FBX > 0V, PGOOD Rising VFBX(REG) + 0.12 V FBX < 0V, PGOOD Rising VFBX(REG) – 0.06 V PGOOD Output Low (VOL) IPGOOD = 250µA 210 300 mV PGOOD Leakage Current PGOOD = 40V 1 µA INTVCC Minimum Voltage to Enable PGOOD Function l 2.5 2.7 2.9 V INTVCC Minimum Voltage to Enable SYNC Function l 2.5 2.7 2.9 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LT3959E is guaranteed to meet performance specifications may cause permanent damage to the device. Exposure to any Absolute from the 0°C to 125°C operating junction temperature. Specifications over Maximum Rating condition for extended periods may affect device the –40°C to 125°C operating junction temperature range are assured by reliability and lifetime. design, characterization and correlation with statistical process controls.
Note 2:
For V The LT3959I is guaranteed over the full –40°C to 125°C operating junction IN below 4V, the EN/UVLO pin must not exceed VIN for proper operation. temperature range.
Note 4:
The LT3959 is tested in a feedback loop which servos VFBX to the reference voltages (1.6V and –0.8V) with the VC pin forced to 1.3V. 3959fa 4 For more information www.linear.com/LT3959 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts