LTC3250 Datasheet, PDF (10/12 Pages) Linear Technology – High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

LTC3250-1.5/LTC3250-1.2
TYPICAL APPLICATIO S
Fixed 3.3V Input to 1.5V Output with Shutdown
1µF
V_IN = 3.3V
4
6
1
C^–
V_IN
C⁺ ₅
V_OUT
1µF
LTC3250-1.5
OFF ON ³ SHDN GND ²
V_OUT = 1.5V ±4%
4.7µF
3250 TA02a
Li-Ion or 3-Cell NiMH to 1.5V Output with Shutdown
1µF
1-CELL Li-Ion OR
3-CELL NiMH
4
1
C^–
V_IN
6
C⁺ ₅
V_OUT
1µF
LTC3250-1.5
OFF ON ³ SHDN GND ²
V_OUT = 1.5V ±4%
4.7µF
3250 TA03a
3-Cell NiMH to 1.2V Output with Shutdown
1µF
V_IN = 2.7V TO 5V
3-CELL NiMH
4
1 ^C–
V_IN
6
C⁺ ₅
V_OUT
1µF
LTC3250-1.2
OFF ON ³ SHDN GND ²
V_OUT = 1.2V ±4%
4.7µF
3250 TA05a
10
Efficiency vs Output Current
100
T_A = 25°C
90
V_IN = 3.3V
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
I_OUT (mA)
3250 TA02b
Efficiency vs Output Current
100
T_A = 25°C
90
80
V_IN = 3.6V
70
V_IN = 4V
60
50
V_IN = 5V
40
30
20
10
0
0.1
1
10
100
1000
I_OUT (mA)
3250 TA03b
Efficiency vs Input Voltage
(I_OUT = 100mA)
100
T_A = 25°C
90
80
70
60
LTC3250
50
40
30
LDO
20
10
0
2.7 3.2 3.7 4.2 4.7 5.2
V_IN (V)
3250 TA05b
3250fa