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| LTC3225 Datasheet, PDF (4/12 Pages) Linear Technology – 150mA Supercapacitor Charger | |||
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LTC3225
TYPICAL PERFORMANCE CHARACTERISTICS
(TA = 25°C, CFLY = 1μF, CIN = 2.2μF, CTOP = CBOT, unless otherwise speciï¬ed)
Extra Input Current vs Output
Current (IVIN â 2 ⢠IOUT)
7
VIN = 3.6V
6 VOUT = 4.5V
5
4
3
2
1
0
0 20 40 60 80 100 120 140 160
IOUT (mA)
3225 G04
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
Oscillator Frequency vs
Supply Voltage
0.94
0.93
TA = 25°C
0.92
TA = â40°C
0.91
TA = 85°C
0.90
Input Ripple and Input Current
VIN
20mV/DIV
IVIN
200mA/DIV
0mA
RPROG = 12k 200ns/DIV
3225 G06
0.89
0.88
2.5 3 3.5 4 4.5 5 5.5
VIN (V)
3225 G07
Charge Pump Open-Loop Output
Resistance vs Temperature
(2VIN â VCOUT)/IOUT
10
VIN = 3.6V
9 VOUT = 4.5V
8
7
6
5
4
3
2
1
0
â40 â15 10
35
60
85
TEMPERATURE (°C)
3225 G08
Charging Proï¬le with Unequal
Initial Output Capacitor Voltage
(Initial VTOP = 1.3V, VBOT = 1V)
SHDN
5V/DIV
IVIN
300mA/DIV
VCOUT
2V/DIV
VTOP-VBOT
500mV/DIV
VSEL = VIN
2s/DIV
RPROG = 12k
CTOP = CBOT = 1.1F
3225 G09
Charging Proï¬le with Unequal
Initial Output Capacitor Voltage
(Initial VTOP = 1V, VBOT = 1.3V)
SHDN
5V/DIV
IVIN
300mA/DIV
VCOUT
2V/DIV
Charging Proï¬le with 30%
Mismatch in Output Capacitance
(CTOP > CBOT)
SHDN
5V/DIV
IVIN
300mA/DIV
VCOUT
2V/DIV
Charging Proï¬le with 30%
Mismatch in Output Capacitance
(CTOP < CBOT)
SHDN
5V/DIV
IVIN
300mA/DIV
VCOUT
2V/DIV
VTOP-VBOT
500mV/DIV
VSEL = VIN
2s/DIV
RPROG = 12k
CTOP = CBOT = 1.1F
VTOP-VBOT
200mV/DIV
3225 G10
VSEL = VIN
5s/DIV
RPROG = 12k
CTOP = 1.43F
CBOT = 1.1F
CTOP INITIAL VOLTAGE = 0V
CBOT INITIAL VOLTAGE = 0V
3225 G11
VTOP-VBOT
200mV/DIV
VSEL = VIN
5s/DIV
RPROG = 12k
CTOP = 1.1F
CBOT = 1.43F
CTOP INITIAL VOLTAGE = 0V
CBOT INITIAL VOLTAGE = 0V
3225 G12
3225f
4
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