Datasheet LTC3448 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode |
| Pages / Page | 20 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. (From Figure1a Except for the … |
| File Format / Size | PDF / 284 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. (From Figure1a Except for the Resistive Divider Resistor Values)
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LTC3448
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a Except for the Resistive Divider Resistor Values) Dynamic Supply Current Dynamic Supply Current RDS(ON) vs Temperature vs Supply Voltage vs Temperature
0.6 340 320 ILOAD = 0A VIN = 3.6V TA = 25°C ILOAD = 0A 0.5 320 µA) µA) 300 300 0.4 ) 280 Ω 2.25MHz ( 280 0.3 2.25MHz 260 DS(ON)R 260 1.5MHz 0.2 1.5MHz 240 240 MAIN SWITCH SYNCH SWITCH 0.1 2.5V 2.5V 220 3.6V 3.6V DYNAMIC SUPPLY CURRENT ( 220 DYNAMIC SUPPLY CURRENT ( 4.2V 4.2V 0 200 200 –50 –25 0 25 50 75 100 125 2 3 4 5 6 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SUPPLY VOLTAGE (V) TEMPERATURE (°C) 3448 G10 3448 G11 3448 G12
Switch Leakage vs Temperature Switch Leakage vs Input Voltage Start-Up from Shutdown
350 10 VIN = 5.5V RUN = 0V RUN = 0V TA = 25°C MAIN 300 RUN SWITCH 5V/DIV 1 250 SYNCHRONOUS VOUT SWITCH 1V/DIV 200 MAIN 0.1 SWITCH 150 IL 500mA/DIV 100 SWITCH LEAKAGE (nA) SWITCH LEAKAGE (nA) SYNCHRONOUS 0.01 SWITCH 50 VIN = 3.6V 40µs/DIV 3448 G15 VOUT = 1.5V I 0 0.001 LOAD = 600mA –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 TEMPERATURE (°C) INPUT VOLTAGE (V) 3448 G13 3448 G14
Load Step Load Step
VOUT VOUT 200mV/DIV 100mV/DIV AC COUPLED AC COUPLED I ILOAD LOAD 100mA/DIV 250mA/DIV IL IL 500mA/DIV 500mA/DIV VIN = 3.6V 10µs/DIV 3448 G16 VIN = 3.6V 10µs/DIV 3448 G17 VOUT = 1.5V VOUT = 1.5V ILOAD = 100µA TO 200mA ILOAD = 50mA TO 600mA COUT = 10µF COUT = 10µF 3448f 5
W U TYPICAL PERFOR A CE CHARACTERISTICS (From Figure1a Except for the Resistive Divider Resistor Values) Dynamic Supply Current Dynamic Supply Current RDS(ON) vs Temperature vs Supply Voltage vs Temperature
0.6 340 320 ILOAD = 0A VIN = 3.6V TA = 25°C ILOAD = 0A 0.5 320 µA) µA) 300 300 0.4 ) 280 Ω 2.25MHz ( 280 0.3 2.25MHz 260 DS(ON)R 260 1.5MHz 0.2 1.5MHz 240 240 MAIN SWITCH SYNCH SWITCH 0.1 2.5V 2.5V 220 3.6V 3.6V DYNAMIC SUPPLY CURRENT ( 220 DYNAMIC SUPPLY CURRENT ( 4.2V 4.2V 0 200 200 –50 –25 0 25 50 75 100 125 2 3 4 5 6 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SUPPLY VOLTAGE (V) TEMPERATURE (°C) 3448 G10 3448 G11 3448 G12
Switch Leakage vs Temperature Switch Leakage vs Input Voltage Start-Up from Shutdown
350 10 VIN = 5.5V RUN = 0V RUN = 0V TA = 25°C MAIN 300 RUN SWITCH 5V/DIV 1 250 SYNCHRONOUS VOUT SWITCH 1V/DIV 200 MAIN 0.1 SWITCH 150 IL 500mA/DIV 100 SWITCH LEAKAGE (nA) SWITCH LEAKAGE (nA) SYNCHRONOUS 0.01 SWITCH 50 VIN = 3.6V 40µs/DIV 3448 G15 VOUT = 1.5V I 0 0.001 LOAD = 600mA –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 TEMPERATURE (°C) INPUT VOLTAGE (V) 3448 G13 3448 G14
Load Step Load Step
VOUT VOUT 200mV/DIV 100mV/DIV AC COUPLED AC COUPLED I ILOAD LOAD 100mA/DIV 250mA/DIV IL IL 500mA/DIV 500mA/DIV VIN = 3.6V 10µs/DIV 3448 G16 VIN = 3.6V 10µs/DIV 3448 G17 VOUT = 1.5V VOUT = 1.5V ILOAD = 100µA TO 200mA ILOAD = 50mA TO 600mA COUT = 10µF COUT = 10µF 3448f 5
