Datasheet LT1933 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | 600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages |
| Pages / Page | 20 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency, VOUT = 5V. Effi ciency, … |
| File Format / Size | PDF / 371 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Effi ciency, VOUT = 5V. Effi ciency, VOUT = 3.3V. Switch Current Limit. Maximum Load Current
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LT1933
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency, VOUT = 5V Effi ciency, VOUT = 3.3V Switch Current Limit
100 100 1200 TA = 25°C TA = 25°C TA = 25°C VOUT = 5V VOUT = 3.3V TYPICAL 1000 90 VIN = 12V 90 VIN = 5V 800 MINIMUM VIN = 24V VIN = 12V 80 80 600 VIN = 24V EFFICIENCY (%) EFFICIENCY (%) 400 70 70 SWITCH CURRENT LIMIT (mA) 200 D1 = MBRM140 D1 = MBRM140 L1 = Toko D53LCB 33μH L1 = Toko D53LCB 22μH 60 60 0 0 100 200 300 400 500 600 0 100 200 300 400 500 600 0 20 40 60 80 100 LOAD CURRENT (mA) LOAD CURRENT (mA) DUTY CYCLE (%) 1933 G01 1933 G02 1933 G03
Maximum Load Current Maximum Load Current Switch Voltage Drop
800 800 600 TA = 25°C TA = 25°C VOUT = 5V VOUT = 3.3V 500 T 700 700 A = 25°C L = 22μH 400 L = 33μH TAGE (mV) TA = 85°C 600 600 300 TA = –40°C L = 15μH L = 22μH 200 LOAD CURRENT (mA) LOAD CURRENT (mA) 500 500 SWITCH VOL 100 400 400 0 0 5 10 15 20 25 30 0 5 10 15 20 25 30 0 0.1 0.2 0.3 0.4 0.5 0.6 INPUT VOLTAGE (V) INPUT VOLTAGE (V) SWITCH CURRENT (A) 1933 G04 1933 G05 1933 G06
Feedback Voltage Undervoltage Lockout Switching Frequency
1.260 3.8 600 1.255 3.6 550 1.250 TAGE (V) 1.245 3.4 500 UVLO (V) 1.240 FEEDBACK VOL 3.2 450 1.235 SWITCHING FREQUENCY (kHz) 1.230 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) 1933 G07 1933 G08 1933 G09 1933fe 4
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency, VOUT = 5V Effi ciency, VOUT = 3.3V Switch Current Limit
100 100 1200 TA = 25°C TA = 25°C TA = 25°C VOUT = 5V VOUT = 3.3V TYPICAL 1000 90 VIN = 12V 90 VIN = 5V 800 MINIMUM VIN = 24V VIN = 12V 80 80 600 VIN = 24V EFFICIENCY (%) EFFICIENCY (%) 400 70 70 SWITCH CURRENT LIMIT (mA) 200 D1 = MBRM140 D1 = MBRM140 L1 = Toko D53LCB 33μH L1 = Toko D53LCB 22μH 60 60 0 0 100 200 300 400 500 600 0 100 200 300 400 500 600 0 20 40 60 80 100 LOAD CURRENT (mA) LOAD CURRENT (mA) DUTY CYCLE (%) 1933 G01 1933 G02 1933 G03
Maximum Load Current Maximum Load Current Switch Voltage Drop
800 800 600 TA = 25°C TA = 25°C VOUT = 5V VOUT = 3.3V 500 T 700 700 A = 25°C L = 22μH 400 L = 33μH TAGE (mV) TA = 85°C 600 600 300 TA = –40°C L = 15μH L = 22μH 200 LOAD CURRENT (mA) LOAD CURRENT (mA) 500 500 SWITCH VOL 100 400 400 0 0 5 10 15 20 25 30 0 5 10 15 20 25 30 0 0.1 0.2 0.3 0.4 0.5 0.6 INPUT VOLTAGE (V) INPUT VOLTAGE (V) SWITCH CURRENT (A) 1933 G04 1933 G05 1933 G06
Feedback Voltage Undervoltage Lockout Switching Frequency
1.260 3.8 600 1.255 3.6 550 1.250 TAGE (V) 1.245 3.4 500 UVLO (V) 1.240 FEEDBACK VOL 3.2 450 1.235 SWITCHING FREQUENCY (kHz) 1.230 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) 1933 G07 1933 G08 1933 G09 1933fe 4
