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| LTC1877 Datasheet, PDF (5/16 Pages) Linear Technology – High Efficiency Monolithic Synchronous Step-Down Regulator | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC1877
Switch Leakage vs Temperature
1400
1200
VIN = 10V
RUN = 0V
1000
800
MAIN SWITCH
600
400
SYNCHRONOUS
SWITCH
200
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
1877 ⢠G12
Switch Leakage vs Input Voltage
16
RUN = 0V
14
12
Burst Mode Operation
SW
5V/DIV
10
8
SYNCHRONOUS
SWITCH
6
VOUT
20mV/DIV
AC COUPLED
4
IL
200mA/DIV
2
MAIN SWITCH
0
0
2
4
6
8
10
INPUT VOLTAGE (V)
1877 ⢠G13
VIN = 5V
VOUT = 1.5V
CIN = 10µF
10µs/DIV
L = 10µH
COUT = 47µF
ILOAD = 50mA
Start-Up from Shutdown
Load Step Response
1877 ⢠G14
RUN
5V/DIV
VOUT
1V/DIV
IL
500mA/DIV
VIN = 5V
VOUT = 1.5V
L = 10µH
50µs/DIV
CIN = 10µF
COUT = 47µF
ILOAD = 500mA
1877 ⢠G15
Load Step Response
VOUT
50mV/DIV
AC COUPLED
IL
500mA/DIV
ITH
1V/DIV
VIN = 5V
VOUT = 1.5V
L = 10µH
40µs/DIV
CIN = 10µF
COUT = 47µF
ILOAD = 50mA TO 500mA
PULSE SKIPPING MODE
1877 ⢠G16
Load Step Response
VOUT
50mV/DIV
AC COUPLED
IL
500mA/DIV
10µs/DIV
VOUT
50mV/DIV
AC COUPLED
IL
500mA/DIV
ITH
1V/DIV
VIN = 5V
VOUT = 1.5V
L = 10µH
40µs/DIV
CIN = 10µF
COUT = 47µF
ILOAD = 50mA TO 500mA
Burst Mode OPERATION
1877 ⢠G17
ITH
1V/DIV
VIN = 5V
VOUT = 1.5V
L = 10µH
20µs/DIV
CIN = 10µF
COUT = 47µF
ILOAD = 200mA TO 500mA
PULSE SKIPPING MODE
1877 ⢠G18
5
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