Datasheet LT1936 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | 1.4A, 500kHz Step-Down Switching Regulator |
| 页数 / 页 | 20 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS. Maximum Load Current. Switch Voltage … |
| 文件格式/大小 | PDF / 306 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Maximum Load Current. Switch Voltage Drop. Feedback Voltage. Undervoltage Lockout
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LT1936
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Load Current Maximum Load Current Switch Voltage Drop
1.8 1.8 600 VOUT = 5V VOUT = 3.3V 500 1.6 1.6 TA = 85°C L = 10μH L = 15μH T 400 A = 25°C TA = –45°C 1.4 1.4 300 L = 10μH TAGE DROP (mV) L = 6.8μH LOAD CURRENT (A) LOAD CURRENT (A) 200 1.2 1.2 SWITCH VOL 100 1.0 1.0 0 0 5 10 15 20 25 30 0 5 10 15 20 25 30 0 0.5 1.0 1.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) SWITCH CURRENT (A) 1936 G04 1936 G05 1936 G06
Feedback Voltage Undervoltage Lockout Switching Frequency
1.210 3.8 600 1.205 3.6 550 TAGE (V) 1.200 3.4 500 UVLO (V) 1.195 FEEDBACK VOL 3.2 450 1.190 SWITCHING FREQUENCY (kHz) 1.185 3.0 400 –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) 1936 G08 1936 G09 1936 G07
Frequency Foldback Soft-Start SHDN Pin Current
700 3.0 200 TA = 25°C TA = 25°C TA = 25°C DC = 30% 600 2.5 150 500 2.0 400 1.5 100 300 PIN CURRENT (μA) 1.0 200 SHDN 50 SWITCHING FREQUENCY (kHz) SWITCH CURRENT LIMIT (A) 100 0.5 0 0 0 0 0.5 1.0 1.5 0 1 2 3 4 0 4 8 12 16 FB PIN VOLTAGE (V) SHDN PIN VOLTAGE (V) SHDN PIN VOLTAGE (V) 1936 G10 1936 G11 1936 G12 1936fd 4
TYPICAL PERFORMANCE CHARACTERISTICS Maximum Load Current Maximum Load Current Switch Voltage Drop
1.8 1.8 600 VOUT = 5V VOUT = 3.3V 500 1.6 1.6 TA = 85°C L = 10μH L = 15μH T 400 A = 25°C TA = –45°C 1.4 1.4 300 L = 10μH TAGE DROP (mV) L = 6.8μH LOAD CURRENT (A) LOAD CURRENT (A) 200 1.2 1.2 SWITCH VOL 100 1.0 1.0 0 0 5 10 15 20 25 30 0 5 10 15 20 25 30 0 0.5 1.0 1.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) SWITCH CURRENT (A) 1936 G04 1936 G05 1936 G06
Feedback Voltage Undervoltage Lockout Switching Frequency
1.210 3.8 600 1.205 3.6 550 TAGE (V) 1.200 3.4 500 UVLO (V) 1.195 FEEDBACK VOL 3.2 450 1.190 SWITCHING FREQUENCY (kHz) 1.185 3.0 400 –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) 1936 G08 1936 G09 1936 G07
Frequency Foldback Soft-Start SHDN Pin Current
700 3.0 200 TA = 25°C TA = 25°C TA = 25°C DC = 30% 600 2.5 150 500 2.0 400 1.5 100 300 PIN CURRENT (μA) 1.0 200 SHDN 50 SWITCHING FREQUENCY (kHz) SWITCH CURRENT LIMIT (A) 100 0.5 0 0 0 0 0.5 1.0 1.5 0 1 2 3 4 0 4 8 12 16 FB PIN VOLTAGE (V) SHDN PIN VOLTAGE (V) SHDN PIN VOLTAGE (V) 1936 G10 1936 G11 1936 G12 1936fd 4