Datasheet LTC3458L (Analog Devices) - 3
| Fabricante | Analog Devices |
| Descripción | 1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| Páginas / Página | 16 / 3 — ELECTRICAL CHARACTERISTICS The |
| Formato / tamaño de archivo | PDF / 385 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS The
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LTC3458L
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 (IBURSTPEAK) RILIM = 84.5k 0.55 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 LTC3458LE 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, IBURSTPEAK, IZERO Currents Current Limit Accuracy Burst Mode Quiescent Current
2200 2.25 20 R V 2000 ILIMIT = 84.5k IN = 3.3V ILIMIT VOUT = 5V 1800 1600 2.15 15 1400 V I OUT = 5V μA) VIN 1200 L = 7.4μH R 1000 LIM = 84.5k 2.05 10 800 IBURSTPEAK CURRENT (A) CURRENT ( CURRENT (mA) 600 400 1.95 5 200 I I VOUT ZERO 0 –200 1.85 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) 3458L G01 3458L G02 3458L G03
Typical Burst Mode Threshold and Hysteresis vs R Maximum Load Current in Burst Oscillator Programming Resistor BURST
160 300 600 RILIM = 84.5k 550 140 250 500 120 3.3VOUT OUT OF 450 200 BURST 5VOUT 100 ) 400 Ω 80 150 350 INTO RT (k BURST 300 CURRENT (mA) 60 CURRENT (mA) 100 250 40 200 50 20 150 0 0 100 50 100 150 200 250 300 1.5 2.0 2.5 3.0 3.5 4.0 4.5 400 600 800 1000 1200 1400 RBURST (kΩ) VIN (V) OSCILLATOR FREQUENCY (kHz) 3458L G04 3458L G05 3458L G06 3458lfa 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 (IBURSTPEAK) RILIM = 84.5k 0.55 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 LTC3458LE 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, IBURSTPEAK, IZERO Currents Current Limit Accuracy Burst Mode Quiescent Current
2200 2.25 20 R V 2000 ILIMIT = 84.5k IN = 3.3V ILIMIT VOUT = 5V 1800 1600 2.15 15 1400 V I OUT = 5V μA) VIN 1200 L = 7.4μH R 1000 LIM = 84.5k 2.05 10 800 IBURSTPEAK CURRENT (A) CURRENT ( CURRENT (mA) 600 400 1.95 5 200 I I VOUT ZERO 0 –200 1.85 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) 3458L G01 3458L G02 3458L G03
Typical Burst Mode Threshold and Hysteresis vs R Maximum Load Current in Burst Oscillator Programming Resistor BURST
160 300 600 RILIM = 84.5k 550 140 250 500 120 3.3VOUT OUT OF 450 200 BURST 5VOUT 100 ) 400 Ω 80 150 350 INTO RT (k BURST 300 CURRENT (mA) 60 CURRENT (mA) 100 250 40 200 50 20 150 0 0 100 50 100 150 200 250 300 1.5 2.0 2.5 3.0 3.5 4.0 4.5 400 600 800 1000 1200 1400 RBURST (kΩ) VIN (V) OSCILLATOR FREQUENCY (kHz) 3458L G04 3458L G05 3458L G06 3458lfa 3