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| LTC3427_15 Datasheet, PDF (10/12 Pages) Linear Technology – 500mA, 1.25MHz Synchronous Step-Up DC/DC Converter in 2mm 2mm DFN Package | |||
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LTC3427
TYPICAL APPLICATIO S
VIN
1.8V TO 3.2V 2-CELL +
ALKALINE
CIN
2.2µF
OFF ON
L1
4.7µH
VIN
SW
LTC3427
SHDN VOUT
GND
FB
1000k
604k
VOUT
3.3V
200mA
COUT
4.7µF
CIN: TAIYO YUDEN X5R JMK212BJ225MD
COUT: TAIYO YUDEN X5R JMK212BJ475MD
L1: TDK RLF7030T-4R7M3R4
3427 F03a
Figure 3. 2-Cell Alkaline to 3.3V Synchronous Boost Converter
VIN
1.8V TO 3.2V 2-CELL +
ALKALINE
CIN
2.2µF
OFF ON
L1
4.7µH
VIN
SW
LTC3427
SHDN VOUT
GND
FB
1000k
332k
VOUT
5V
150mA
COUT
4.7µF
CIN: TAIYO YUDEN X5R JMK212BJ225MD
COUT: TAIYO YUDEN X5R JMK212BJ475MD
L1: TDK RLF7030T-4R7M3R4
3427 F04a
Figure 4. 2-Cell Alkaline to 5V Synchronous
Boost Converter with Output Disconnect
Li-Ion to 5V Synchronous Boost Converter
VIN
3.1V TO 4.2V
+
Li-Ion
CIN
2.2µF
OFF ON
L1
4.7µH
VIN
SW
LTC3427
SHDN VOUT
CIN: TAIYO YUDEN X5R JMK212BJ225MD
GND
FB
COUT: TAIYO YUDEN X5R JMK212BJ475MD
L1: TDK RLF7030T-4R7M3R4
1000k
332k
VOUT
5V
250mA
COUT
4.7µF
3427 TA02a
10
2-Cell to 3.3V Efficiency
100
95
VIN = 3.1V
90
85 VIN = 2.4V
80
VIN = 1.8V
75
70
65
60
55
50
1
10
100
1000
LOAD CURRENT (mA)
3427 G01
2-Cell to 5V Efficiency
100
95
90
VIN = 3.2V
85
VIN = 2.4V
80
75
70
VIN = 1.8V
65
60
55
50
1
10
100
1000
LOAD CURRENT (mA)
3427 G03
Li-Ion to 5V Efficiency
100
95
VIN = 4.2V
90
VIN = 3.6V
85
80
75
VIN = 3.1V
70
65
60
55
50
1
10
100
1000
LOAD CURRENT (mA)
3427 G02
3427fa
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