Datasheet

LTC3446
6
3446ff
Typical perForMance characTerisTics
Buck PMOS Switch On-Resistance
Buck NMOS Switch On-Resistance
Buck Transient Response with
Burst Mode Defeated
Buck Transient Response with
Burst Mode Enabled
VLDO Transient Response
VLDO Rejection of Buck DC/DC
Burst Mode Ripple
TEMPERATURE (°C)
–45
PMOS RESISTANCE (mΩ)
160
180
200
30 80
3446 G13
140
120
–20 5
55 105 130
100
80
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
TEMPERATURE (°C)
–45
NMOS RESISTANCE (mΩ)
160
180
200
30 80
3446 G14
140
120
–20 5
55 105 130
100
80
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
100µs/DIV
3446 G15
BUCK OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
LOAD
CURRENT
500mA
50mA
FRONT PAGE APPLICATION CIRCUIT
100µs/DIV
3446 G16
BUCK OUTPUT
VOLTAGE
50mV/DIV
AC-COUPLED
LOAD
CURRENT
500mA
50mA
FRONT PAGE APPLICATION CIRCUIT
100µs/DIV
LV
OUT
= 1.5V OR 1.2V
FRONT PAGE APPLICATION CIRCUIT
3446 G17
VLDO OUTPUT
VOLTAGE
20mV/DIV
AC-COUPLED
LOAD
CURRENT
300mA
30mA
V
LVIN
=
BUCK V
OUT
20mV/DIV
AC-COUPLED
V
LVIN
= BUCK V
OUT
= 1.8V
V
IN
= 4.2V
V
LVOUT
= 1.5V
I
LVOUT
= 50mA
C
LVOUT
= 2.2µF
V
LVOUT
10mV/DIV
AC-COUPLED
2µs/DIV
3446 G18