Datasheet LT1777 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Low Noise Step-Down Switching Regulator |
| Pages / Page | 24 / 2 — ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL … |
| File Format / Size | PDF / 286 Kb |
| Document Language | English |
ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
Text Version of Document
LT1777
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER I FOR ATIO (Note 1)
Supply Voltage ... 48V TOP VIEW ORDER PART Switch Voltage (V NUMBER IN – VSW) (Note 4) .. 51V GND* 1 16 GND* SHDN, SYNC Pin Voltage .. 7V NC 2 15 NC V LT1777CS CC Pin Voltage .. 30V SHDN 3 14 VC FB Pin Voltage .. 3.0V LT1777IS V 4 13 CC FB Operating Junction Temperature Range V 5 12 D SYNC LT1777C ... 0°C to 125°C V 6 11 SW NC LT1777I ... – 40°C to 125°C SGND 7 10 VIN Storage Temperature Range .. – 65°C to 150°C GND* 8 9 GND* *FOUR CORNER PINS ARE FUSED TO INTERNAL DIE Lead Temperature (Soldering, 10 sec)... 300°C ATTACH PADDLE FOR HEAT S PACKAGE SINKING. CONNECT THESE 16-LEAD PLASTIC SO FOUR PINS TO EXPANDED PC T LANDS FOR PROPER HEAT JMAX = 125°C, θJA = 50°C/W* SINKING. Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 24V, 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 IVIN VIN Supply Current VC = 0V 620 800 µA ● 900 µA IVCC VCC Supply Current VC = 0V 2.5 3.5 mA ● 4.5 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 ∆IC = ±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 ≤ 48V ● 0.01 %/V Voltage Gain 200 600 V/V 2
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER I FOR ATIO (Note 1)
Supply Voltage ... 48V TOP VIEW ORDER PART Switch Voltage (V NUMBER IN – VSW) (Note 4) .. 51V GND* 1 16 GND* SHDN, SYNC Pin Voltage .. 7V NC 2 15 NC V LT1777CS CC Pin Voltage .. 30V SHDN 3 14 VC FB Pin Voltage .. 3.0V LT1777IS V 4 13 CC FB Operating Junction Temperature Range V 5 12 D SYNC LT1777C ... 0°C to 125°C V 6 11 SW NC LT1777I ... – 40°C to 125°C SGND 7 10 VIN Storage Temperature Range .. – 65°C to 150°C GND* 8 9 GND* *FOUR CORNER PINS ARE FUSED TO INTERNAL DIE Lead Temperature (Soldering, 10 sec)... 300°C ATTACH PADDLE FOR HEAT S PACKAGE SINKING. CONNECT THESE 16-LEAD PLASTIC SO FOUR PINS TO EXPANDED PC T LANDS FOR PROPER HEAT JMAX = 125°C, θJA = 50°C/W* SINKING. Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25
°
C. VIN = 24V, 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 IVIN VIN Supply Current VC = 0V 620 800 µA ● 900 µA IVCC VCC Supply Current VC = 0V 2.5 3.5 mA ● 4.5 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 ∆IC = ±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 ≤ 48V ● 0.01 %/V Voltage Gain 200 600 V/V 2
