Datasheet LT1936 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | 1.4A, 500kHz Step-Down Switching Regulator |
| 页数 / 页 | 20 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| 文件格式/大小 | PDF / 306 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LT1936
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2)
VC Clamp 1.8 V VC Switch Threshold 0.7 V Internal Compensation R 50 kΩ Internal Compensation C VCOMP = 1V 150 pF COMP Pin Leakage VCOMP = 1.8V, E and I Grades ● 1 μA H Grade ● 2 μA Switching Frequency VFB = 1.1V 400 500 600 kHz VFB = 0V 40 kHz Maximum Duty Cycle ● 87 92 % Switch Current Limit (Note 3) 1.9 2.2 2.6 A Switch VCESAT ISW = 1.2A 410 520 mV Switch Leakage Current 2 μA Minimum BOOST Voltage Above SW ISW = 1.2A 2 2.2 V BOOST Pin Current ISW = 1.2A 28 50 mA BOOST Pin Leakage VSW = 0V 0.1 1 μA SHDN Input Voltage High 2.3 V SHDN Input Voltage Low 0.3 V SHDN Pin Current VSHDN = 2.3V (Note 5) 34 50 μA VSHDN = 12V (Note 5) 140 240 μA VSHDN = 0V 0.01 0.1 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings with statistical process controls. The LT1936I specifi cations are may cause permanent damage to the device. Exposure to any Absolute guaranteed over the –40°C to 125°C temperature range. The LT1936H Maximum Rating condition for extended periods may affect device specifi cations are guaranteed over the –40°C to 150°C temperature range. reliability and lifetime.
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Note 2
: The LT1936E is guaranteed to meet performance specifi cations Slope compensation reduces current limit at higher duty cycle. from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
Note 4:
Current fl ows out of pin. temperature range are assured by design, characterization and correlation
Note 5:
Current fl ows into pin.
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency, VOUT = 5V Effi ciency, VOUT = 3.3V Switch Current Limit
100 100 3.0 2.5 V 90 IN = 12V 90 VIN = 5V TYP 2.0 VIN = 24V VIN = 12V MIN 80 80 1.5 VIN = 24V EFFICIENCY (%) EFFICIENCY (%) CURRENT LIMIT (A) 1.0 70 70 V V OUT = 5V OUT = 3.3V T T A = 25°C A = 25°C 0.5 D1 = DFLS140L D1 = DFLS140L L1 = 15μH, TOKO D63CB L1 = 10μH, TOKO D63CB 60 60 0 0 0.5 1.0 1.5 0 0.5 1.0 1.5 0 20 40 60 80 100 LOAD CURRENT (A) LOAD CURRENT (A) DUTY CYCLE (%) 1936 G01 1936 G02 1936 G03 1936fd 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2)
VC Clamp 1.8 V VC Switch Threshold 0.7 V Internal Compensation R 50 kΩ Internal Compensation C VCOMP = 1V 150 pF COMP Pin Leakage VCOMP = 1.8V, E and I Grades ● 1 μA H Grade ● 2 μA Switching Frequency VFB = 1.1V 400 500 600 kHz VFB = 0V 40 kHz Maximum Duty Cycle ● 87 92 % Switch Current Limit (Note 3) 1.9 2.2 2.6 A Switch VCESAT ISW = 1.2A 410 520 mV Switch Leakage Current 2 μA Minimum BOOST Voltage Above SW ISW = 1.2A 2 2.2 V BOOST Pin Current ISW = 1.2A 28 50 mA BOOST Pin Leakage VSW = 0V 0.1 1 μA SHDN Input Voltage High 2.3 V SHDN Input Voltage Low 0.3 V SHDN Pin Current VSHDN = 2.3V (Note 5) 34 50 μA VSHDN = 12V (Note 5) 140 240 μA VSHDN = 0V 0.01 0.1 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings with statistical process controls. The LT1936I specifi cations are may cause permanent damage to the device. Exposure to any Absolute guaranteed over the –40°C to 125°C temperature range. The LT1936H Maximum Rating condition for extended periods may affect device specifi cations are guaranteed over the –40°C to 150°C temperature range. reliability and lifetime.
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Note 2
: The LT1936E is guaranteed to meet performance specifi cations Slope compensation reduces current limit at higher duty cycle. from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
Note 4:
Current fl ows out of pin. temperature range are assured by design, characterization and correlation
Note 5:
Current fl ows into pin.
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency, VOUT = 5V Effi ciency, VOUT = 3.3V Switch Current Limit
100 100 3.0 2.5 V 90 IN = 12V 90 VIN = 5V TYP 2.0 VIN = 24V VIN = 12V MIN 80 80 1.5 VIN = 24V EFFICIENCY (%) EFFICIENCY (%) CURRENT LIMIT (A) 1.0 70 70 V V OUT = 5V OUT = 3.3V T T A = 25°C A = 25°C 0.5 D1 = DFLS140L D1 = DFLS140L L1 = 15μH, TOKO D63CB L1 = 10μH, TOKO D63CB 60 60 0 0 0.5 1.0 1.5 0 0.5 1.0 1.5 0 20 40 60 80 100 LOAD CURRENT (A) LOAD CURRENT (A) DUTY CYCLE (%) 1936 G01 1936 G02 1936 G03 1936fd 3