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| LTC3225-1_15 Datasheet, PDF (4/14 Pages) Linear Technology – 150mA Supercapacitor Charger | |||
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LTC3225/LTC3225-1
TYPICAL PERFORMANCE CHARACTERISTICS
(TA = 25°C, CFLY = 1μF, CIN = 2.2μF, CTOP = CBOT, unless otherwise speciï¬ed)
IOUT vs RPROG
160
140
VIN = 3.6V
VOUT = 4.5V (LTC3225)
120
100
80
60
40
20
0
10
20
30
40
50
60
RPROG (kΩ)
3225 G01
Extra Input Current vs Output
Current (IVIN â 2 ⢠IOUT)
7
VIN = 3.6V
CHARGE PUMP IS ON
6
VOUT = 5V
5
VOUT = 4.5V
4
VOUT = 3.7V
3
VOUT = 4.2V
2
20 40 60 80 100 120 140 160
IOUT (mA)
3225 G04
IOUT vs VOUT (RPROG = 12k)
180
160
140
120
100
80
60
40
CTOP = CBOT
VIN = 2.8V
20
VIN = 3.6V
VIN = 5.5V
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
VOUT (V)
3225 G02
No-Load Input Current vs
Supply Voltage
30
25
TA = 85°C
20
TA = 25°C
TA = â40°C
15
10
5
0
2.5 3 3.5 4 4.5
VIN (V)
5 5.5
3225 G05
Efï¬ciency vs VIN
100
90
80
70
LTC3225
60
50
LTC3225-1
40
30 ILOAD = 100mA
20 CTOP = CBOT
10
VSEL = VIN
VSEL = 0
0
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
3525 G03
Charge Pump Open-Loop Output
Resistance vs Temperature
(2VIN â VCOUT)/IOUT
10.0
VIN = 3.6V
9.5
9.0
VOUT = 3.7V
(LTC3225-1)
8.5
8.0
VOUT = 4.5V
(LTC3225)
7.5
7.0
6.5
6.0
â40
â15 10
35
60
85
TEMPERATURE (°C)
3225 G06
Oscillator Frequency vs
Supply Voltage
0.94
0.93
TA = 25°C
0.92
TA = â40°C
0.91
TA = 85°C
0.90
0.89
0.88
2.5 3 3.5 4 4.5
VIN (V)
4
Input Ripple and Input Current
VIN
20mV/DIV
Charging Proï¬le with Unequal
Initial Output Capacitor Voltage
(Initial VTOP = 1.3V, VBOT = 1V)
SHDN
5V/DIV
IVIN
300mA/DIV
IVIN
200mA/DIV
0mA
VCOUT
2V/DIV
VTOP-VBOT
500mV/DIV
5 5.5
RPROG = 12k 200ns/DIV
3225 G08
LTC3225
2 SEC/DIV
VSEL = VIN
RPROG = 12k
CTOP = CBOT = 1.1F
CTOP INITIAL VOLTAGE = 1.3V
CBOT INITIAL VOLTAGE = 1V
3225 G09
3225 G07
3225fb
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