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

HerstellerAnalog Devices
BeschreibungHigh Voltage, 1.5A, 500kHz Step-Down Switching Regulators
Seiten / Seite28 / 2 — ABSOLUTE AXI U RATI GS (Note 1). PACKAGE/ORDER I FOR ATIO. ELECTRICAL …
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ABSOLUTE AXI U RATI GS (Note 1). PACKAGE/ORDER I FOR ATIO. ELECTRICAL CHARACTERISTICS. The

ABSOLUTE AXI U RATI GS (Note 1) PACKAGE/ORDER I FOR ATIO ELECTRICAL CHARACTERISTICS The

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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