Datasheet LTC1878 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | High Efficiency Monolithic Synchronous Step-Down Regulator |
| Pages / Page | 16 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Switch Leakage vs Temperature. … |
| File Format / Size | PDF / 239 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Switch Leakage vs Temperature. Switch Leakage vs Input Voltage. Burst Mode Operation
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LTC1878
W U TYPICAL PERFOR A CE CHARACTERISTICS Switch Leakage vs Temperature Switch Leakage vs Input Voltage Burst Mode Operation
2.5 1.2 VIN = 7V RUN = 0V RUN = 0V 1.0 SW 2.0 SYNCHRONOUS 5V/DIV µA) SWITCH 0.8 1.5 VOUT 50mV/DIV 0.6 AC 1.0 MAIN COUPLED SWITCH 0.4 SWITCH LEAKAGE ( SYNCHRONOUS SWITCH LEAKAGE (nA) MAIN 0.5 SWITCH SWITCH IL 0.2 200mA/DIV 0 0 – 50 – 25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 10µs/DIV TEMPERATURE (°C) INPUT VOLTAGE (V) VIN = 4.2V CIN = 22µF VOUT = 1.5V COUT = 47µF 1878 G13 1878 G20 L = 10µH ILOAD = 50mA 1878 G14
Pulse Skipping Mode Operation Start-Up from Shutdown Load Step Response
SW RUN VOUT 5V/DIV 2V/DIV 50mV/DIV AC COUPLED VOUT VOUT 1V/DIV 20mV/DIV I AC L 500mA/DIV COUPLED IL 500mA/DIV IL 200mA/DIV ITH 1V/DIV 1µs/DIV 40µs/DIV 40µs/DIV VIN = 4.2V CIN = 22µF VIN = 3.6V CIN = 22µF VIN = 3.6V CIN = 22µF VOUT = 1.5V COUT = 47µF VOUT = 1.5V COUT = 47µF VOUT = 1.5V COUT = 47µF L = 10µH ILOAD = 50mA 1878 G15 L = 10µH ILOAD = 500mA 1878 G16 L = 10µH ILOAD = 200mA TO 500mA 1878 G17 PULSE SKIPPING MODE
Load Step Response Load Step Response
VOUT VOUT 100mV/DIV 100mV/DIV AC AC COUPLED COUPLED IL IL 500mA/DIV 500mA/DIV I I TH TH 1V/DIV 1V/DIV 40µs/DIV 40µs/DIV VIN = 3.6V CIN = 22µF VIN = 3.6V CIN = 22µF VOUT = 1.5V COUT = 47µF VOUT = 1.5V COUT = 47µF L = 10µH ILOAD = 50mA TO 500mA 1878 G18 L = 10µH ILOAD = 50mA TO 500mA 1878 G19 PULSE SKIPPING MODE Burst Mode OPERATION 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Switch Leakage vs Temperature Switch Leakage vs Input Voltage Burst Mode Operation
2.5 1.2 VIN = 7V RUN = 0V RUN = 0V 1.0 SW 2.0 SYNCHRONOUS 5V/DIV µA) SWITCH 0.8 1.5 VOUT 50mV/DIV 0.6 AC 1.0 MAIN COUPLED SWITCH 0.4 SWITCH LEAKAGE ( SYNCHRONOUS SWITCH LEAKAGE (nA) MAIN 0.5 SWITCH SWITCH IL 0.2 200mA/DIV 0 0 – 50 – 25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 10µs/DIV TEMPERATURE (°C) INPUT VOLTAGE (V) VIN = 4.2V CIN = 22µF VOUT = 1.5V COUT = 47µF 1878 G13 1878 G20 L = 10µH ILOAD = 50mA 1878 G14
Pulse Skipping Mode Operation Start-Up from Shutdown Load Step Response
SW RUN VOUT 5V/DIV 2V/DIV 50mV/DIV AC COUPLED VOUT VOUT 1V/DIV 20mV/DIV I AC L 500mA/DIV COUPLED IL 500mA/DIV IL 200mA/DIV ITH 1V/DIV 1µs/DIV 40µs/DIV 40µs/DIV VIN = 4.2V CIN = 22µF VIN = 3.6V CIN = 22µF VIN = 3.6V CIN = 22µF VOUT = 1.5V COUT = 47µF VOUT = 1.5V COUT = 47µF VOUT = 1.5V COUT = 47µF L = 10µH ILOAD = 50mA 1878 G15 L = 10µH ILOAD = 500mA 1878 G16 L = 10µH ILOAD = 200mA TO 500mA 1878 G17 PULSE SKIPPING MODE
Load Step Response Load Step Response
VOUT VOUT 100mV/DIV 100mV/DIV AC AC COUPLED COUPLED IL IL 500mA/DIV 500mA/DIV I I TH TH 1V/DIV 1V/DIV 40µs/DIV 40µs/DIV VIN = 3.6V CIN = 22µF VIN = 3.6V CIN = 22µF VOUT = 1.5V COUT = 47µF VOUT = 1.5V COUT = 47µF L = 10µH ILOAD = 50mA TO 500mA 1878 G18 L = 10µH ILOAD = 50mA TO 500mA 1878 G19 PULSE SKIPPING MODE Burst Mode OPERATION 5
