Datasheet LT1776 (Analog Devices) - 2

LT1776
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
Supply Voltage (Note 5) .. 60V ORDER PART TOP VIEW NUMBER Switch Voltage (Note 5) ... 60V SHDN 1 8 V SHDN, SYNC Pin Voltage ... 7V C LT1776CN8 V 2 7 FB V CC LT1776CS8 CC Pin Voltage ... 30V VSW 3 6 SYNC FB Pin Voltage ... 3V LT1776IN8 GND 4 5 VIN Operating Junction Temperature Range LT1776IS8 LT1776C .. 0°C to 125°C N8 PACKAGE S8 PACKAGE 8-LEAD PDIP 8-LEAD PLASTIC SO S8 PART MARKING LT1776I .. – 40°C to 125°C TJMAX = 125°C, θJA = 130°C/ W (N8) T 1776 Storage Temperature Range ... – 65°C to 150°C JMAX = 125°C, θJA = 110°C/ W (S8) 1776I Lead Temperature (Soldering, 10 sec).. 300°C Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 40V, VSW open, VCC = 5V, VC = 1.4V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supplies
VIN(MIN) Minimum Input Voltage 6.7 7.0 V ● 7.4 V Thermally Limited Continuous Operating Voltage ● 40 V IVIN VIN Supply Current VC = 0V 620 800 µA ● 900 µA IVCC VCC Supply Current VC = 0V 3.2 4.0 mA ● 5.0 mA VVCC VCC Dropout Voltage (Note 2) 2.8 3.1 V Shutdown Mode IVIN VSHDN = 0V 30 50 µA ● 75 µA
Feedback Amplifier
VREF Reference Voltage 1.225 1.240 1.255 V ● 1.215 1.265 V IIN FB Pin Input Bias Current 600 1500 nA gm Feedback Amplifier Transconductance ∆lc = ±10µA 400 650 1000 µmho ● 200 1500 µmho ISRC, ISNK Feedback Amplifier Source or Sink Current 60 100 170 µA ● 45 220 µA VCL Feedback Amplifier Clamp Voltage 2.0 V Reference Voltage Line Regulation 12V ≤ VIN ≤ 60V ● 0.01 %/V Voltage Gain 200 600 V/V
Output Switch
VON Output Switch On Voltage ISW = 0.5A 1.0 1.5 V ILIM Switch Current Limit (Note 3) ● 0.55 0.70 1.0 A
Current Amplifier
Control Pin Threshold Duty Cycle = 0% 0.9 1.1 1.25 V Control Voltage to Switch Transconductance 2 A/V 2