Datasheet LT3742 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | Dual, 2-Phase Step-Down Switching Controller |
| 页数 / 页 | 26 / 3 — elecTrical characTerisTics. The. denotes the specifications which apply … |
| 文件格式/大小 | PDF / 319 Kb |
| 文件语言 | 英语 |
elecTrical characTerisTics. The. denotes the specifications which apply over the full operating
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LT3742
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS
FB Pin Bias Current VFB = 0.8V, VC = 0.4V 50 200 nA FB Pin Voltage Matching –4 0 4 mV Error Amplifier Transconductance 250 µmho Error Amplifier Voltage Gain 500 V/V VC Pin Source Current VFB = 0.6V 15 µA VC Pin Sink Current VFB = 1V 15 µA Controller Switching Frequency 440 500 560 kHz Switching Phase 180 Deg Maximum Current Sense Voltage V – SENSE = 3.3V l 50 60 70 mV Current Sense Matching Between Controllers ±5 % Current SENSE Pins Total Current SENSE–, SENSE+ = 0V –1.0 mA SENSE–, SENSE+ = 3.3V 40 µA Gate Rise Time CLOAD = 3300pF 40 ns Gate Fall Time CLOAD = 3300pF 60 ns Gate On Voltage (VG – VSW) VBIAS = 12V 6.0 6.7 7.0 V Gate Off Voltage (VG – VSW) VBIAS = 12V 0.4 0.75 V PG Pin Voltage Low IPG = 100µA 0.20 0.5 V Lower PG Trip Level (Relative to VFB) VFB Increasing –7 –10 –13 % Lower PG Trip Level (Relative to VFB) VFB Decreasing –10 –13 –16 % Upper PG Trip Level (Relative to VFB) VFB Increasing 7 10 13 % Upper PG Trip Level (Relative to VFB) VFB Decreasing 4 7 10 % PG Pin Leakage Current VPG = 2V 0.1 µA PG Pin Sink Current VPG = 0.5V 200 500 µA Bias Pin Voltage VIN + 6.6 VIN + 7 VIN + 7.7 V SWB Pin Current Limit 250 340 500 mA SWB Pin Leakage Current VSWB = 12V 0.01 1 µA Bias Supply Switching Frequency 0.88 1.0 1.12 MHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 2:
The LT3742E is guaranteed to meet performance specifications may cause permanent damage to the device. Exposure to any Absolute from 0°C to 125°C operating junction temperature range. Specifications Maximum Rating condition for extended periods may affect device over the –40°C to 125°C operating junction temperature range are reliability and lifetime. assured by design, characterization and correlation with statistical process controls. 3742fa 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS
FB Pin Bias Current VFB = 0.8V, VC = 0.4V 50 200 nA FB Pin Voltage Matching –4 0 4 mV Error Amplifier Transconductance 250 µmho Error Amplifier Voltage Gain 500 V/V VC Pin Source Current VFB = 0.6V 15 µA VC Pin Sink Current VFB = 1V 15 µA Controller Switching Frequency 440 500 560 kHz Switching Phase 180 Deg Maximum Current Sense Voltage V – SENSE = 3.3V l 50 60 70 mV Current Sense Matching Between Controllers ±5 % Current SENSE Pins Total Current SENSE–, SENSE+ = 0V –1.0 mA SENSE–, SENSE+ = 3.3V 40 µA Gate Rise Time CLOAD = 3300pF 40 ns Gate Fall Time CLOAD = 3300pF 60 ns Gate On Voltage (VG – VSW) VBIAS = 12V 6.0 6.7 7.0 V Gate Off Voltage (VG – VSW) VBIAS = 12V 0.4 0.75 V PG Pin Voltage Low IPG = 100µA 0.20 0.5 V Lower PG Trip Level (Relative to VFB) VFB Increasing –7 –10 –13 % Lower PG Trip Level (Relative to VFB) VFB Decreasing –10 –13 –16 % Upper PG Trip Level (Relative to VFB) VFB Increasing 7 10 13 % Upper PG Trip Level (Relative to VFB) VFB Decreasing 4 7 10 % PG Pin Leakage Current VPG = 2V 0.1 µA PG Pin Sink Current VPG = 0.5V 200 500 µA Bias Pin Voltage VIN + 6.6 VIN + 7 VIN + 7.7 V SWB Pin Current Limit 250 340 500 mA SWB Pin Leakage Current VSWB = 12V 0.01 1 µA Bias Supply Switching Frequency 0.88 1.0 1.12 MHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 2:
The LT3742E is guaranteed to meet performance specifications may cause permanent damage to the device. Exposure to any Absolute from 0°C to 125°C operating junction temperature range. Specifications Maximum Rating condition for extended periods may affect device over the –40°C to 125°C operating junction temperature range are reliability and lifetime. assured by design, characterization and correlation with statistical process controls. 3742fa 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts