LTC3448_15 Datasheet, PDF (5/20 Pages) Linear Technology – 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode

LTC3448
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure1a Except for the Resistive Divider Resistor Values)
R_DS(ON) vs Temperature
0.6
0.5
0.4
0.3
0.2
MAIN SWITCH SYNCH SWITCH
0.1
2.5V
2.5V
3.6V
3.6V
4.2V
4.2V
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3448 G10
Switch Leakage vs Temperature
350 _{VIN = 5.5V}
RUN = 0V
300
250
200
MAIN
SWITCH
150
100
SYNCHRONOUS
SWITCH
50
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3448 G13
Load Step
Dynamic Supply Current
vs Supply Voltage
340
I_LOAD = 0A
320 ^{TA = 25°C}
300
280
2.25MHz
260
1.5MHz
240
220
Dynamic Supply Current
vs Temperature
320
V_IN = 3.6V
I_LOAD = 0A
300
280
2.25MHz
260
1.5MHz
240
220
200
2
3
4
5
SUPPLY VOLTAGE (V)
6
3448 G11
200
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3448 G12
Switch Leakage vs Input Voltage
10 _{RUN = 0V}
T_A = 25°C
1
SYNCHRONOUS
SWITCH
MAIN
SWITCH
Start-Up from Shutdown
RUN
5V/DIV
V_OUT
1V/DIV
0.1
I_L
500mA/DIV
0.01
0.001
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
3448 G14
V_IN = 3.6V
V_OUT = 1.5V
I_LOAD = 600mA
40µs/DIV
3448 G15
Load Step
V_OUT
200mV/DIV
AC COUPLED
I_LOAD
100mA/DIV
I_L
500mA/DIV
V_IN = 3.6V
10µs/DIV
V_OUT = 1.5V
I_LOAD = 100µA TO 200mA
C_OUT = 10µF
3448 G16
V_OUT
100mV/DIV
AC COUPLED
I_LOAD
250mA/DIV
I_L
500mA/DIV
V_IN = 3.6V
10µs/DIV
V_OUT = 1.5V
I_LOAD = 50mA TO 600mA
C_OUT = 10µF
3448 G17
3448f
5