Datasheet LTM8027 (Analog Devices) - 3

LTM8027
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25°C. VIN = 20V, BIAS1 = BIAS2 = 10V, RUN = 2V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input DC Voltage (Note 5) l 4.5 60 V VOUT Maximum Output DC Voltage 0A < IOUT ≤ 4A, VIN = 48V 24 V IOUT Output DC Current VIN ≤ 60V, VOUT = 12V, (Note 4) 0 4 A VIN(START) Minimum Start Voltage 7.5 V ∆VOUT/∆VIN Line Regulation VOUT = 12V, 15V< VIN < 60V, ILOAD = 4A 0.2 % ∆VOUT/∆ILOAD Load Regulation VOUT = 12V, VIN = 24V, 0A < ILOAD ≤ 4A 0.2 % VUVLO(RISING) Input Undervoltage Lockout Threshold (Note 5) 4.6 V (Rising) VUVLO(FALLING) Input Undervoltage Lockout Threshold (Note 5) 3.7 V (Falling) VADJ ADJ Voltage 1.224 1.238 V l 1.215 1.245 V IQ(VIN) Quiescent Current into IN VBIAS = VAUX, VOUT = 12VDC, No Load 39 mA VRUN = 0V 9 µA VBIAS1 BIAS1 Undervoltage Lockout (Rising) 6.5 V BIAS1 Undervoltage Lockout (Falling) 6 V IBIAS1 Current into BIAS1 No Load 25 mA RUN = 0V 25 µA VBIAS2 Minimum BIAS2 Voltage 3 V IBIAS2 Current Into BIAS2 1 µA VBIAS1(MINOV) Minimum Voltage to Overdrive Internal 8.5 V Regulator (INTVCC) RFB Internal Feedback Resistor 499 kΩ VRUN(RISING) RUN Enable Voltage (Rising) 1.4 V VRUN(FALLING) RUN Enable Voltage (Falling) 1.2 V fSW Switching Frequency RT = 187kΩ 100 kHz RT = 23.7kΩ 500 kHz RSYNC SYNC Input Resistance 40 kΩ VSYNC(TH) SYNC Voltage Threshold fSYNC = 350kHz l 2.3 V ISS Soft-Start Charging Current 2 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings –40°C to 125°C internal operating temperature range. The LTM8027MP may cause permanent damage to the device. Exposure to any Absolute is guaranteed to meet specifications over the full –55°C to 125°C Maximum Rating condition for extended periods may affect device internal operating range. Note that the maximum internal temperature is reliability and lifetime. determined by specific operating conditions in conjunction with board
Note 2:
The RUN pin is internally clamped to 5V. layout, the rated package thermal resistance and other environmental
Note 3:
The LTM8027E is guaranteed to meet performance specifications factors. from 0°C to 125°C internal operating temperature. Specifications over
Note 4:
The maximum continuous output current may be derated by the the full –40°C to 125°C internal operating temperature range are assured LTM8027 junction temperature. by design, characterization and correlation with statistical process
Note 5:
VIN voltages below the start-up threshold (7.5V) are only controls. The LTM8027I is guaranteed to meet specifications over the full supported when BIAS1 is externally driven above 6.5V. 8027fd For more information www.linear.com/LTM8027 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Photograph Package Description Revision History Typical Application Related Parts