LTC3109_15 Datasheet, PDF (14/24 Pages) Linear Technology – Auto-Polarity, Ultralow Voltage Step-Up Converter and Power Manager

LTC3109
Applications Information
C1
V_{IN +}
T1
••
C_IN
1nF
330k
V_OUT
SET
NOTE: VALUES FOR C_IN, T1, C1 AND C_OUT
ARE DETERMINED BY THE APPLICATION
C1A
V_OUT2
LTC3109
C2A
V_OUT
SWA
V_INA
C1B
C2B
SWB
V_INB
VS1
VS2
VLDO
PG00D
V_{OUT2_EN}
VSTORE
VAUX
GND
V_OUT2
+
VLDO
2.2µF
V_OUT
C_OUT
PG00D
V_{OUT2_ENABLE}
10µF
3109 F03a
Figure 3. Unipolar Application
Typical P_VOUT vs dT for Unipolar
Configuration
10
FERROTEC 9500/127/100B, 40mm TEG
C1 = 33nF,
T1 = COILCRAFT LPR6235-123QML
1:50 RATIO
V_OUT = 5V
V_OUT = 3.3V
1
0.1
100
dT (°K)
10
3109 F03f
Typical I_VOUT vs V_IN for Unipolar
Configuration
10000
V_OUT = 3.3V
1000
100
10
10
1:100, C1 = 6.8nF
1:50, C1 = 33nF
1:20, C1 = 68nF
100
V_IN (mV)
1000
3109 F03b
Typical Efficiency vs V_IN for
Unipolar Configuration
60
55
50
45
40
35
30
25
20
15
10
5
0
10
1:100, C1 = 6.8nF
1:50, C1 = 33nF
1:20, C1 = 68nF
100
V_IN (mV)
1000
3109 F03c
Typical Input Current vs V_IN for
Unipolar Configuration
600
550
1:100, C1 = 6.8nF
500
1:50, C1 = 33nF
1:20, C1 = 68nF
450
400
350
300
250
200
150
100
50
0
10
100
1000
V_IN (mV)
3109 F03d
Typical R_IN vs V_IN for Unipolar
Configuration
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
10
1:100, C1 = 6.8nF
1:50, C1 = 33nF
1:20, C1 = 68nF
100
V_IN (mV)
1000
3109 F03e
14
For more information www.linear.com/LTC3109
3109fb