Datasheet LTC1265, LTC1265-3.3, LTC1265-5 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | 1.2A, High Efficiency Step-Down DC/DC Converter |
| 页数 / 页 | 16 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 244 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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文件文字版本
LTC1265/LTC1265-3.3/LTC1265-5
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 10V, VSHDN = 0V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIH Shutdown Pin High Min Voltage at Pin 10 for Device to be in Shutdown 1.2 V VIL Shutdown Pin Low Max Voltage at Pin 10 for Device to be Active 0.6 V I10 Shutdown Pin Input Current VSHDN = 8V 0.5 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 3:
Dynamic supply current is higher due to the gate charge being of the device may be impaired. delivered at the switching frequency.
Note 2:
T
Note 4:
In applications where R J is calculated from the ambient temperature TA and power SENSE is placed at ground potential, the dissipation P off time increases by approximately 40%. D according to the following formulas: LTC1265CS, LTC1265CS-3.3, LTC1265CS-5: TJ = TA + (PD • 110°C/W)
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Input Voltage Efficiency vs Input Voltage Efficiency vs Load Current (V (V OUT = 5V) OUT = 3.3V)
100 100 100 LTC1265-3.3 98 R 98 SENSE = 0.1Ω C 95 96 T = 130pF V 96 COIL = CTX33-4 IN = 5V ILOAD = 250mA 94 94 90 92 VIN = 9V ILOAD = 250mA 92 ILOAD = 800mA 90 85 90 VIN = 12V 88 88 EFFICIENCY (%) EFFICIENCY (%) 80 EFFICIENCY (%) LTC1265-3.3 86 ILOAD = 800mA 86 VOUT = 3.3V LTC1265-5 84 R 84 75 SENSE = 0.1Ω RSENSE = 0.1Ω CT = 130pF 82 82 CT = 130pF COIL = CTX33-4 COIL = CTX33-4 80 70 80 4 5 6 7 8 9 10 11 12 13 0.01 0.10 1.00 4 5 6 7 8 9 10 11 12 13 INPUT VOLTAGE (V) LOAD CURRENT (A) INPUT VOLTAGE (V) LTC1265 G03 1265 G01 1265 G02
Operating Frequency vs (V Switch Resistance IN – VOUT) Switch Leakage Current
1.2 0.9 300 VIN = 12V 0.8 270 1.0 0°C 25°C 0.7 240 70°C 210 0.8 0.6 ) TJ = 125°C Ω 180 ( 0.5 T 0.6 J = 70°C (ON) 150 0.4 RDS 120 0.4 0.3 TJ = 25°C 90 NORMALIZED FREQUENCY 0.2 LEAKAGE CURRENT (nA) TJ = 0°C 0.2 60 0.1 30 0 0 0 0 1 2 3 4 5 6 7 8 9 10 3 4 5 6 7 8 9 10 11 12 13 0 20 40 60 80 100 (VIN – VOUT) VOLTAGE (V) INPUT VOLTAGE (V) TEMPERATURE (°C) 1265 G04 1265 G05 1265 G06 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 10V, VSHDN = 0V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIH Shutdown Pin High Min Voltage at Pin 10 for Device to be in Shutdown 1.2 V VIL Shutdown Pin Low Max Voltage at Pin 10 for Device to be Active 0.6 V I10 Shutdown Pin Input Current VSHDN = 8V 0.5 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 3:
Dynamic supply current is higher due to the gate charge being of the device may be impaired. delivered at the switching frequency.
Note 2:
T
Note 4:
In applications where R J is calculated from the ambient temperature TA and power SENSE is placed at ground potential, the dissipation P off time increases by approximately 40%. D according to the following formulas: LTC1265CS, LTC1265CS-3.3, LTC1265CS-5: TJ = TA + (PD • 110°C/W)
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Input Voltage Efficiency vs Input Voltage Efficiency vs Load Current (V (V OUT = 5V) OUT = 3.3V)
100 100 100 LTC1265-3.3 98 R 98 SENSE = 0.1Ω C 95 96 T = 130pF V 96 COIL = CTX33-4 IN = 5V ILOAD = 250mA 94 94 90 92 VIN = 9V ILOAD = 250mA 92 ILOAD = 800mA 90 85 90 VIN = 12V 88 88 EFFICIENCY (%) EFFICIENCY (%) 80 EFFICIENCY (%) LTC1265-3.3 86 ILOAD = 800mA 86 VOUT = 3.3V LTC1265-5 84 R 84 75 SENSE = 0.1Ω RSENSE = 0.1Ω CT = 130pF 82 82 CT = 130pF COIL = CTX33-4 COIL = CTX33-4 80 70 80 4 5 6 7 8 9 10 11 12 13 0.01 0.10 1.00 4 5 6 7 8 9 10 11 12 13 INPUT VOLTAGE (V) LOAD CURRENT (A) INPUT VOLTAGE (V) LTC1265 G03 1265 G01 1265 G02
Operating Frequency vs (V Switch Resistance IN – VOUT) Switch Leakage Current
1.2 0.9 300 VIN = 12V 0.8 270 1.0 0°C 25°C 0.7 240 70°C 210 0.8 0.6 ) TJ = 125°C Ω 180 ( 0.5 T 0.6 J = 70°C (ON) 150 0.4 RDS 120 0.4 0.3 TJ = 25°C 90 NORMALIZED FREQUENCY 0.2 LEAKAGE CURRENT (nA) TJ = 0°C 0.2 60 0.1 30 0 0 0 0 1 2 3 4 5 6 7 8 9 10 3 4 5 6 7 8 9 10 11 12 13 0 20 40 60 80 100 (VIN – VOUT) VOLTAGE (V) INPUT VOLTAGE (V) TEMPERATURE (°C) 1265 G04 1265 G05 1265 G06 3