Datasheet LTC3458 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| 页数 / 页 | 16 / 3 — ELECTRICAL CHARACTERISTICS The |
| 文件格式/大小 | PDF / 320 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS The
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LTC3458
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 3.3V, VOUT = 5V, RT = 200k, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifier Sink Current 7 μA SYNC Input High ● 1.5 V SYNC Input Low ● 0.35 V SHDN Input High ● 1.25 V SHDN Input Low ● 0.3 V BURST Mode Peak Current RILIM = 124k 0.4 A BURST Threshold Voltage 1.10 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings Continuous operation above the specified maximum operating junction may cause permanent damage to the device. Exposure to any Absolute temperature may impair device reliability. Maximum Rating condition for extended periods may affect device
Note 3:
The LTC3458 is guaranteed to meet performance specifications reliability and lifetime. from 0°C to 70°C. Specifications over the –40°C to 85°C operating
Note 2:
This IC includes overtemperature protection that is intended to temperature range are assured by design, characterization and correlation protect the device during momentary overload conditions. Junction with statistical process controls. temperature will exceed 125°C when overtemperature protection is active.
W U TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25
°
C unless otherwise specified) ILIMIT, IBURST, TZERO Currents Current Limit Accuracy Burst Mode Quiescent Current
2000 1.8 20 R V ILIMIT = 124k IN = 3.3V 1800 I V LIMIT OUT = 5V 1600 1,7 15 1400 1200 V I OUT = 7V μA) VIN L = 10μH 1000 RILIM = 124k 1.6 10 800 600 CURRENT (A) CURRENT ( CURRENT (mA) IBURST PEAK 400 1.5 5 200 IVOUT IZERO 0 –200 1.4 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 –45 –30 –15 0 15 30 45 60 75 90 –40 –15 10 35 60 85 V TEMPERATURE ( IN (V) °C) TEMPERATURE (°C) 3458 G01 3458 G02 3458 G03
Typical Burst Mode Threshold and Hysteresis vs R Maximum Load Current in Burst Oscillator Programming Resistor BURST
160 250 600 RILIM = 124k 550 140 5VOUT 7.5VOUT 200 3.3VOUT 500 120 OUT OF 450 BURST 100 150 ) 400 Ω 80 350 INTO RT (k BURST 100 300 CURRENT (mA) 60 CURRENT (mA) 250 40 50 200 20 150 0 0 100 50 100 150 200 250 300 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 400 600 800 1000 1200 1400 RBURST (kΩ) VIN (V) OSCILLATOR FREQUENCY (kHz) 3458 G04 3458 G05 3458 G06 3458fa 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 3.3V, VOUT = 5V, RT = 200k, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifier Sink Current 7 μA SYNC Input High ● 1.5 V SYNC Input Low ● 0.35 V SHDN Input High ● 1.25 V SHDN Input Low ● 0.3 V BURST Mode Peak Current RILIM = 124k 0.4 A BURST Threshold Voltage 1.10 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings Continuous operation above the specified maximum operating junction may cause permanent damage to the device. Exposure to any Absolute temperature may impair device reliability. Maximum Rating condition for extended periods may affect device
Note 3:
The LTC3458 is guaranteed to meet performance specifications reliability and lifetime. from 0°C to 70°C. Specifications over the –40°C to 85°C operating
Note 2:
This IC includes overtemperature protection that is intended to temperature range are assured by design, characterization and correlation protect the device during momentary overload conditions. Junction with statistical process controls. temperature will exceed 125°C when overtemperature protection is active.
W U TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25
°
C unless otherwise specified) ILIMIT, IBURST, TZERO Currents Current Limit Accuracy Burst Mode Quiescent Current
2000 1.8 20 R V ILIMIT = 124k IN = 3.3V 1800 I V LIMIT OUT = 5V 1600 1,7 15 1400 1200 V I OUT = 7V μA) VIN L = 10μH 1000 RILIM = 124k 1.6 10 800 600 CURRENT (A) CURRENT ( CURRENT (mA) IBURST PEAK 400 1.5 5 200 IVOUT IZERO 0 –200 1.4 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 –45 –30 –15 0 15 30 45 60 75 90 –40 –15 10 35 60 85 V TEMPERATURE ( IN (V) °C) TEMPERATURE (°C) 3458 G01 3458 G02 3458 G03
Typical Burst Mode Threshold and Hysteresis vs R Maximum Load Current in Burst Oscillator Programming Resistor BURST
160 250 600 RILIM = 124k 550 140 5VOUT 7.5VOUT 200 3.3VOUT 500 120 OUT OF 450 BURST 100 150 ) 400 Ω 80 350 INTO RT (k BURST 100 300 CURRENT (mA) 60 CURRENT (mA) 250 40 50 200 20 150 0 0 100 50 100 150 200 250 300 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 400 600 800 1000 1200 1400 RBURST (kΩ) VIN (V) OSCILLATOR FREQUENCY (kHz) 3458 G04 3458 G05 3458 G06 3458fa 3