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| LTC3448_15 Datasheet, PDF (15/20 Pages) Linear Technology – 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode | |||
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TYPICAL APPLICATIO S
Single Li-Ion 1.5V/600mA Regulator for
High Efficiency and Small Footprint
VIN
2.7V
TO 5.5V
CIN
4.7µF
CER
4
8
VIN
RUN
SW 5
VOUT 2
LTC3448 3
MODE
6
FREQ
7 SYNC
VFB 1
GND
9
2.2µH*
22pF 474k
216k
VOUT
1.5V
COUT
15µF
3448 TA03
CIN: TAIYO YUDEN CERAMIC JMK212BJ475MG
COUT: TAIYO YUDEN CERAMIC JMK212BJ475MG
*MURATA LQH32CN2R2M33
VOUT
100mV/DIV
AC COUPLED
ILOAD
100mA/DIV
Load Step
LTC3448
Efficiency vs Output Current
100
VOUT = 1.5V
90 TA = 25°C
80
70
60
50
40
30
20
10
0
0.0001
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
0.001
0.01
0.1
1
LOAD CURRENT (A)
23448 G03
Load Step
VOUT
100mV/DIV
AC COUPLED
ILOAD
250mA/DIV
IL
500mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 1.5V
ILOAD = 100µA TO 200mA
3448 TA05
Note: Performance data measured on the LTC3448 with external resistors
IL
500mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 1.5V
ILOAD = 50mA TO 600mA
3448 TA06
3448f
15
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