LTC3226_12 Datasheet, PDF (5/16 Pages) Linear Technology – 2-Cell Supercapacitor Charger

LTC3226
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
LDO Load Regulation
3.300
3.295
CPO = 4V
V_OUT SET TO 3.3V
LDO Supply Regulation
3.310
3.305
I_OUT = 10μA
V_OUT SET TO 3.3V
3.290
3.300
3.285
3.295
3.280
3.290
3.275
3.285
3.270
0.001
0.01
0.1
I_OUT (A)
1
10
3226 G01
3.280
3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2
CPO VOLTAGE (V)
3226 G02
LDO FET On-Resistance
vs CPO Voltage and Temperature
350
LOAD = 500mA
300
T = 90°C
250
T = 25°C
LDO Output Transient Step
Response Waveform
200
150
T = –40°C
V_OUT
50mV/DIV
AC-COUPLED
100
1000mA
I_OUT
50
500mA
0
2.2 2.7
3.2 3.7 4.2
CPO VOLTAGE (V)
4.7 5.2
3226 G04
500μs/DIV
3226 G05
Charge Pump Input Current
vs CPO Output Voltage
400
R_PROG = 33.3k
350
V_IN = 3.8V
300
250
R_PROG = 50k
200
150
R_PROG = 100k
100
50
2x MODE
1x MODE
0
0
1
2
3
4
5
CPO VOLTAGE (V)
3226 G07
Charge Pump Charging Current
vs CPO Output Voltage
400
R_PROG = 33.3k
350
V_IN = 3.8V
300
250
R_PROG = 50k
200
150
R_PROG = 100k
100
50
2x MODE
1x MODE
0
0
1
2
3
4
5
CPO VOLTAGE (V)
3226 G08
LDO Regulation Voltage
vs Temperature
3.325
3.320
V_CPO = 5V
I_OUT = 1mA
3.315
3.310
3.305
3.300
3.295
3.290
3.285
–45 –25 –5 15 35 55 75
TEMPERATURE (°C)
95 115
3226 G03
Charge Pump Oscillator Frequency
vs V_CPO and Temperature
980
V_IN = 3.3V
960
T = –45°C
940
T = 25°C
920
900
880
860
T = 90°C
840
3.6 3.8
4.0 4.2 4.4 4.6
CPO VOLTAGE (V)
4.8 5.0
3226 G06
Charge Pump Input Current
vs V_IN with CPO Grounded
400
R_PROG = 33.2k
390 ^{VCPO = 0V}
380
370
360
350
340
90°C
25°C
–45°C
330
3.3 3.6 3.9 4.2 4.5 4.8 5.1
V_IN (V)
3226 G09
3226fa
5