Datasheet LT1956, LT1956-5 (Analog Devices) - 2

LT1956/LT1956-5
W W W U ABSOLUTE AXI U RATI GS (Note 1)
Input Voltage (VIN) ... 60V Operating Junction Temperature Range BOOST Pin Above SW .. 35V LT1956EFE/LT1956EFE-5/LT1956EGN/LT1956EGN-5 BOOST Pin Voltage ... 68V (Notes 8, 10) ... – 40°C to 125°C SYNC, SENSE Voltage (LT1956-5) ... 7V LT1956IFE/LT1956IFE-5/LT1956IGN/LT1956IGN-5 SHDN Voltage ... 6V (Notes 8, 10) ... – 40°C to 125°C BIAS Pin Voltage .. 30V Storage Temperature Range .. – 65°C to 150°C FB Pin Voltage/Current (LT1956) ... 3.5V/2mA Lead Temperature (Soldering, 10 sec)... 300°C
U W U PACKAGE/ORDER I FOR ATIO
TOP VIEW ORDER PART TOP VIEW ORDER PART GND 1 16 GND NUMBER GND 1 NUMBER 16 GND SW 2 15 SHDN SW 2 15 SHDN NC 3 LT1956EFE LT1956EGN 14 SYNC NC 3 14 SYNC V 4 LT1956IFE LT1956IGN 13 IN NC V 4 13 IN NC NC 5 LT1956EFE-5 LT1956EGN-5 12 FB/SENSE NC 5 12 FB/SENSE BOOST 6 LT1956IFE-5 LT1956IGN-5 11 VC BOOST 6 11 VC NC 7 10 BIAS NC 7 10 BIAS FE PART MARKING GN PART MARKING GND 8 9 GND GND 8 9 GND 1956EFE 1956 FE PACKAGE GN PACKAGE 16-LEAD PLASTIC TSSOP 1956IFE 16-LEAD PLASTIC SSOP 1956I TJMAX = 125°C, θJA = 45°C/ W, θJC (PAD) = 10°C/ W T 1956EFE-5 JMAX = 125°C, θJA = 85°C/ W, θJC (PIN 8) = 25°C/ W 19565 EXPOSED BACKSIDE MUST BE SOLDERED FOUR CORNER PINS SOLDERED TO GROUND PLANE 1956IFE-5 1956I5 TO GROUND PLANE Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 15V, VC = 1.5V, SHDN = 1V, Boost o/c, SW o/c, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage (LT1956) 5.5V ≤ VIN ≤ 60V 1.204 1.219 1.234 V VOL + 0.2 ≤ VC ≤ VOH – 0.2 ● 1.195 1.243 V SENSE Voltage (LT1956-5) 5.5V ≤ VIN ≤ 60V 4.94 5 5.06 V VOL + 0.2 ≤ VC ≤ VOH – 0.2 ● 4.90 5.10 V SENSE Pin Resistance (LT1956-5) 9.5 13.8 19 kΩ FB Input Bias Current (LT1956) ● 0.5 1.5 µA Error Amp Voltage Gain (Notes 2, 9) 200 400 V/V Error Amp gm dl (VC) = ±10µA (Note 9) 1500 2000 3000 µMho ● 1000 3200 µMho VC to Switch gm 1.7 A/V EA Source Current FB = 1V or VSENSE = 4.1V ● 125 225 400 µA EA Sink Current FB = 1.4V or VSENSE = 5.7V ● 100 225 450 µA VC Switching Threshold Duty Cycle = 0 0.9 V VC High Clamp SHDN = 1V 2.1 V 1956f 2