Datasheet LT8636 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | 42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| 页数 / 页 | 26 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Current. Soft–Start … |
| 修订版 | A |
| 文件格式/大小 | PDF / 2.1 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Soft-Start Current. Soft–Start Current. PG High Thresholds. PG Low Thresholds
文件文字版本
LT8636
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Current Soft–Start Current PG High Thresholds PG Low Thresholds
2.2 10.0 –6.0 VSS = 0.5V 2.1 9.5 (%) –6.5 (%) REF REF 2.0 9.0 –7.0 1.9 8.5 –7.5 FB RISING 1.8 8.0 FB RISING –8.0 1.7 7.5 –8.5 FB FALLING SS PIN CURRENT (µA) FB FALLING 1.6 7.0 –9.0 1.5 6.5 –9.5 PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V 1.4 6.0 –10.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8636 G29 8636 G31 8636 G32
RT Programmed Switching Frequency Minimum Input Voltage Minimum Input V Bias Pin Current
250 3.6 8.5 225 8.0 200 3.4 175 3.2 7.5 150 TAGE (V) 125 3.0 7.0 100 2.8 6.5 RT PIN RESISTOR (kΩ) 75 INPUT VOL BIAS PIN CURRENT (mA) VBIAS = 5V 50 V 2.6 OUT = 5V 6.0 I 25 LOAD = 1A fSW = 1MHz 0 2.4 5.5 0.2 0.6 1 1.4 1.8 2.2 2.6 3 –50 –25 0 25 50 75 100 125 5 10 15 20 25 30 35 40 45 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8636 G34 8636 G35 8636 G33
Case Temperature Rise vs 7A Bias Pin Current Case Temperature Rise Pulsed Load
25 80 135 V V DC2918A DEMO BOARD BIAS = 5V IN = 12V, fSW = 1MHz V V 120 V OUT = 5V 70 IN = 24V, fSW = 1MHz IN = 12V V V V 20 IN = 12V IN = 12V, fSW = 2MHz OUT = 5V I V 105 f LOAD = 1A IN = 24V, fSW = 2MHz 60 SW = 2MHz DEMO BOARD IN STILL AIR STANDBY LOAD = 0.25A 90 1kHz PULSED LOAD = 7A 15 50 L = XEL6030, 1.5µH 75 TURE RISE (°C) 40 TURE RISE (°C) 60 10 30 45 BIAS PIN CURRENT (mA) 20 5 30 CASE TEMPERA CASE TEMPERA 10 15 0 0 0 0.2 0.6 1 1.4 1.8 2.2 2.6 3.0 0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 1 SWITCHING FREQUENCY (MHz) LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8636 G36 8636 G37 8636 G38 Rev. A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Soft-Start Current Soft–Start Current PG High Thresholds PG Low Thresholds
2.2 10.0 –6.0 VSS = 0.5V 2.1 9.5 (%) –6.5 (%) REF REF 2.0 9.0 –7.0 1.9 8.5 –7.5 FB RISING 1.8 8.0 FB RISING –8.0 1.7 7.5 –8.5 FB FALLING SS PIN CURRENT (µA) FB FALLING 1.6 7.0 –9.0 1.5 6.5 –9.5 PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V 1.4 6.0 –10.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8636 G29 8636 G31 8636 G32
RT Programmed Switching Frequency Minimum Input Voltage Minimum Input V Bias Pin Current
250 3.6 8.5 225 8.0 200 3.4 175 3.2 7.5 150 TAGE (V) 125 3.0 7.0 100 2.8 6.5 RT PIN RESISTOR (kΩ) 75 INPUT VOL BIAS PIN CURRENT (mA) VBIAS = 5V 50 V 2.6 OUT = 5V 6.0 I 25 LOAD = 1A fSW = 1MHz 0 2.4 5.5 0.2 0.6 1 1.4 1.8 2.2 2.6 3 –50 –25 0 25 50 75 100 125 5 10 15 20 25 30 35 40 45 SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) INPUT VOLTAGE (V) 8636 G34 8636 G35 8636 G33
Case Temperature Rise vs 7A Bias Pin Current Case Temperature Rise Pulsed Load
25 80 135 V V DC2918A DEMO BOARD BIAS = 5V IN = 12V, fSW = 1MHz V V 120 V OUT = 5V 70 IN = 24V, fSW = 1MHz IN = 12V V V V 20 IN = 12V IN = 12V, fSW = 2MHz OUT = 5V I V 105 f LOAD = 1A IN = 24V, fSW = 2MHz 60 SW = 2MHz DEMO BOARD IN STILL AIR STANDBY LOAD = 0.25A 90 1kHz PULSED LOAD = 7A 15 50 L = XEL6030, 1.5µH 75 TURE RISE (°C) 40 TURE RISE (°C) 60 10 30 45 BIAS PIN CURRENT (mA) 20 5 30 CASE TEMPERA CASE TEMPERA 10 15 0 0 0 0.2 0.6 1 1.4 1.8 2.2 2.6 3.0 0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 1 SWITCHING FREQUENCY (MHz) LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8636 G36 8636 G37 8636 G38 Rev. A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts