LTC3408_15 Datasheet, PDF (4/12 Pages) Linear Technology – 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

LTC3408
TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1)
Frequency vs V_OUT
1600
1400
T_A = 25°C
V_IN = 3.6V
1200
1000
800
600
Output Voltage vs Load Current
1.844 _{TA = 25°C}
V_IN = 3.6V
1.834
1.824
1.814
1.804
1.794
1.784
R_DS(ON) vs Input Voltage
0.7
T_A = 25°C
0.6
MAIN
0.5
SWITCH
0.4
SYNCHRONOUS
0.3
SWITCH
0.2
BYPASS
0.1
SWITCH
400
0
0.2 0.4 0.6 0.8
V_OUT (V)
1.0 1.2
3408 G08
R_DS(ON) vs Temperature
0.7
V_IN = 2.7V
0.6
V_IN = 3.6V
0.5 MAIN ^{VIN = 4.2V}
SWITCH
0.4
0.3
SYNCHRONOUS SWITCH
0.2
BYPASS
0.1
SWITCH
V_IN = 3V
V_IN = 4.2V
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3408 G11
1.774
0 100 200 300 400 500 600 700 800 900 1000
LOAD CURRENT (mA)
3408 G09
Dynamic Supply Current
vs Supply Voltage
4500
4000
3500
T_A = 25°C
V_OUT = 1.8V
I_LOAD = 0A
3000
FORCED CONTINUOUS
MODE
2500
2000
1500
1000
500
0
2
3
4
5
6
SUPPLY VOLTAGE (V)
3408 G12
0
01
2 34 5
INPUT VOTLAGE (V)
67
3408 G10
Switch Leakage vs Temperature
300
V_IN = 5.5V
RUN = 0V
250
200
150
100
MAIN SWITCH
50
SYNCHRONOUS SWITCH
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3408 G13
Switch Leakage vs Input Voltage
120
T_A = 25°C
RUN = 0V
100
SYNCHRONOUS
SWITCH
80
Start-Up from Shutdown
RUN
2V/DIV
V_OUT
1V/DIV
60
MAIN
SWITCH
40
I_L
500mA/DIV
20
0
012
3
4
56
INPUT VOLTAGE (V)
3408 G14
V_IN = 3.6V
V_REF = 0.6V
R_LOAD = 3Ω
40µs/DIV
3408 G15
3408f
4