LTC1707_1 Datasheet, PDF (4/16 Pages) Linear Technology – High Efficiency Monolithic Synchronous Step-Down Switching Regulator

LTC1707
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Output Current vs
Input Voltage
1000
V_OUT = 1.8V
800 _{VOUT = 1.5V}
600
400
200
0
2.5
V_OUT = 5V
V_OUT = 3.3V
V_OUT = 2.5V
V_OUT = 2.9V
3.5 4.5 5.5 6.5
INPUT VOLTAGE (V)
T_J = 85°C
L = 15µH
7.5 8.5
1707 G10
Switch Leakage Current
vs Temperature
1800
V_IN = 8.4V
1600
1400
1200
1000
800
600
SYNCHRONOUS
SWITCH
400
200
0
– 50 – 25
MAIN
SWITCH
0 25 50 75
TEMPERATURE (°C)
100 125
1707 G11
Switch Resistance
vs Temperature
0.9
V_IN = 5V
0.8
0.7
SYNCHRONOUS
SWITCH
0.6
0.5
MAIN
0.4
SWITCH
0.3
0.2
0.1
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1707 G12
Switch Resistance
vs Input Voltage
Load Step Transient Response
Burst Mode Operation
0.9
0.8
0.7
SYNCHRONOUS SWITCH
0.6
0.5 _{MAIN SWITCH}
0.4
0.3
I_TH
0.5V/DIV
V_OUT
50mV/DIV
AC COUPLED
I_LOAD
500mA/DIV
SW
5V/DIV
V_OUT
20mV/DIV
AC COUPLED
I_LOAD
200mA/DIV
0.2
0.1
0
2.5 3.5 4.5 5.5 6.5 7.5 8.5
INPUT VOLTAGE (V)
1707 G13
V_IN = 5V
25µs/DIV
V_OUT = 3.3V
L = 15µH
C_IN = 22µF
C_OUT = 100µF
I_LOAD = 0mA TO 500mA
Burst Mode OPERATION
1707 G14
V_IN = 5V
V_OUT = 3.3V
L = 15µH
C_IN = 22µF
C_OUT = 100µF
I_LOAD = 50mA
10µs/DIV
1707 G15
4