Datasheet LT3431 (Analog Devices) - 2
| 制造商 | Analog Devices |
| 描述 | High Voltage, 3A, 500kHz Step-Down Switching Regulator |
| 页数 / 页 | 28 / 2 — ABSOLUTE AXI U RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL … |
| 文件格式/大小 | PDF / 263 Kb |
| 文件语言 | 英语 |
ABSOLUTE AXI U RATI GS. PACKAGE/ORDER I FOR ATIO. (Note 1). ELECTRICAL CHARACTERISTICS. The
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LT3431
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Input Voltage (VIN) ... 60V ORDER PART TOP VIEW BOOST Pin Above SW .. 35V NUMBER GND 1 16 GND BOOST Pin Voltage ... 68V SW 2 15 SHDN SYNC Voltage ... 7V V 3 14 SYNC LT3431EFE IN SHDN Voltage ... 6V V 4 13 IN NC LT3431IFE SW 5 12 FB BIAS Pin Voltage .. 30V BOOST 6 11 VC FB Pin Voltage/Current .. 3.5V/2mA NC 7 10 BIAS Operating Junction Temperature Range GND 8 9 GND FE PART MARKING LT3431EFE (Notes 8, 10) ... – 40°C to 125°C FE PACKAGE 16-LEAD PLASTIC TSSOP 3431EFE LT3431IFE (Notes 8, 10) ... – 40°C to 125°C TJMAX = 125°C, θJA = 45°C/ W, θJC (PAD) = 10°C/W 3431IFE Storage Temperature Range .. – 65°C to 150°C EXPOSED PAD MUST BE SOLDERED TO GROUND PLANE Lead Temperature (Soldering, 10 sec)... 300°C 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 open circuit, SW open circuit, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage (VREF) 5.5V ≤ VIN ≤ 60V 1.204 1.219 1.234 V VOL + 0.2 ≤ VC ≤ VOH – 0.2 ● 1.195 1.243 V FB Input Bias Current ● –0.2 –1.5 µA Error Amp Voltage Gain (Note 2) 200 475 V/V Error Amp gm dl (VC) = ±10µA 1650 2200 3300 µMho ● 1000 4200 µMho VC to Switch gm 3.4 A/V EA Source Current FB = 1V or VSENSE = 4.1V ● 125 275 450 µA EA Sink Current FB = 1.4V or VSENSE = 5.7V ● 100 275 500 µA VC Switching Threshold Duty Cycle = 0 0.8 V VC High Clamp SHDN = 1V 2.1 V Switch Current Limit VC Open, BOOST = VIN + 5V, FB = 1V or VSENSE = 4.1V –40°C␣ ≤ Tj ≤ 25°C 3.0 5 6.5 A (Note 9) Tj = 125°C 2.5 4 5.5 A Switch On Resistance ISW = 2.5A, BOOST = VIN + 5V (Note 7) 0.1 0.14 Ω ● 0.18 Ω Maximum Switch Duty Cycle FB = 1V or VSENSE = 4.1V 88 92 % ● 80 % Switch Frequency VC Set to Give DC = 50% 460 500 540 kHz ● 430 500 570 kHz fSW Line Regulation 5.5V ≤ VIN ≤ 60V ● 0.05 0.15 %/V fSW Shifting Threshold Df = 10kHz 0.8 V sn3431 3431fs 2
W W W U U W U ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1)
Input Voltage (VIN) ... 60V ORDER PART TOP VIEW BOOST Pin Above SW .. 35V NUMBER GND 1 16 GND BOOST Pin Voltage ... 68V SW 2 15 SHDN SYNC Voltage ... 7V V 3 14 SYNC LT3431EFE IN SHDN Voltage ... 6V V 4 13 IN NC LT3431IFE SW 5 12 FB BIAS Pin Voltage .. 30V BOOST 6 11 VC FB Pin Voltage/Current .. 3.5V/2mA NC 7 10 BIAS Operating Junction Temperature Range GND 8 9 GND FE PART MARKING LT3431EFE (Notes 8, 10) ... – 40°C to 125°C FE PACKAGE 16-LEAD PLASTIC TSSOP 3431EFE LT3431IFE (Notes 8, 10) ... – 40°C to 125°C TJMAX = 125°C, θJA = 45°C/ W, θJC (PAD) = 10°C/W 3431IFE Storage Temperature Range .. – 65°C to 150°C EXPOSED PAD MUST BE SOLDERED TO GROUND PLANE Lead Temperature (Soldering, 10 sec)... 300°C 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 open circuit, SW open circuit, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage (VREF) 5.5V ≤ VIN ≤ 60V 1.204 1.219 1.234 V VOL + 0.2 ≤ VC ≤ VOH – 0.2 ● 1.195 1.243 V FB Input Bias Current ● –0.2 –1.5 µA Error Amp Voltage Gain (Note 2) 200 475 V/V Error Amp gm dl (VC) = ±10µA 1650 2200 3300 µMho ● 1000 4200 µMho VC to Switch gm 3.4 A/V EA Source Current FB = 1V or VSENSE = 4.1V ● 125 275 450 µA EA Sink Current FB = 1.4V or VSENSE = 5.7V ● 100 275 500 µA VC Switching Threshold Duty Cycle = 0 0.8 V VC High Clamp SHDN = 1V 2.1 V Switch Current Limit VC Open, BOOST = VIN + 5V, FB = 1V or VSENSE = 4.1V –40°C␣ ≤ Tj ≤ 25°C 3.0 5 6.5 A (Note 9) Tj = 125°C 2.5 4 5.5 A Switch On Resistance ISW = 2.5A, BOOST = VIN + 5V (Note 7) 0.1 0.14 Ω ● 0.18 Ω Maximum Switch Duty Cycle FB = 1V or VSENSE = 4.1V 88 92 % ● 80 % Switch Frequency VC Set to Give DC = 50% 460 500 540 kHz ● 430 500 570 kHz fSW Line Regulation 5.5V ≤ VIN ≤ 60V ● 0.05 0.15 %/V fSW Shifting Threshold Df = 10kHz 0.8 V sn3431 3431fs 2