LTC3448_15 Datasheet, PDF (17/20 Pages) Linear Technology – 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode

TYPICAL APPLICATIO S
Single Li-Ion 2.5V/600mA Regulator with 1.8MHz External
Synchronization and External MODE
V_IN
2.5V TO 5.5V
C_IN
4.7µF
CER
TO
µPROCESSOR
CONTROL
TO 0V TO 1.3V
OR GREATER 1.8MHz
EXTERNAL CLOCK
4
8
V_IN
RUN
5
SW
V_OUT ²
LTC3448
3
MODE
6
FREQ
7 _SYNC
1
V_FB
GND
9
2.2µH
1.58M
500k
3448 TA12
C_FF
22pF
C_OUT
10µF
CER
V_OUT
2.5V
600mA
V_OUT
100mV/DIV
AC COUPLED
Load Step
LDOCNTRL
2V/DIV
I_LOAD
250mA/DIV
V_IN = 3.6V
40µs/DIV
V_OUT = 2.5V
I_LOAD = 100µA TO 300mA
3448 TA12b
V_OUT
100mV/DIV
AC COUPLED
LDOCNTRL
2V/DIV
I_LOAD
250mA/DIV
Load Step
V_IN = 3.6V
40µs/DIV
V_OUT = 2.5V
I_LOAD = 100µA TO 600mA
LTC3448
3448 TA12c
Single Li-Ion 1.2V/600mA Regulator with 2.5MHz External Synchronization
V_IN
2.5V TO 5.5V
C_IN
4.7µF
CER
TO 0V TO 1.3V OR
GREATER 2.5MHz
EXTERNAL CLOCK
4
8
V_IN
RUN
SW ⁵
V_OUT ²
LTC3448
3
MODE
6
1
FREQ
7 _SYNC
V_FB
GND
9
3448 TA13
2.2µH
316k
316k
C_FF
22pF
C_OUT
10µF
CER
V_OUT
1.2V
600mA
3448f
17