LTC3204-5_15 Datasheet, PDF (4/12 Pages) Linear Technology – Low Noise Regulated Charge Pump in 2 2 DFN

LTC3204-3.3/LTC3204-5/
LTC3204B-3.3/LTC3204B-5
TYPICAL PERFOR A CE CHARACTERISTICS _{(LTC3204-3.3/LTC3204B-3.3 ONLY)}
(T_A = 25°C, C_FLY = C_IN = C_OUT = 2.2µF unless otherwise specified)
Load Regulation
3.35
3.30
3.25
V_IN = 3.2V
3.20
V_IN = 1.8V
3.15
3.10
3.05
0
V_IN = 2.4V
100 200 300 400 500
LOAD CURRENT (mA)
3204 G07
No-Load Input Current vs
Supply Voltage
64
2.0
62
1.8
60
1.6
58
LTC3204B-3.3
1.4
56
1.2
54
1.0
52
0.8
50
0.6
LTC3204-3.3
48
0.4
46
0.2
44
0
1.8 2 2.2 2.4 2.6 2.8 3 3.2
SUPPLY VOLTAGE (V)
3204 G10
Output Load Capability at 4%
Below Regulation
400
V_OUT = 3.168V
350
T_A = 25°C
300
T_A = 90°C
250
T_A = – 45°C
200
150
100
50
0
1.5
2.0
2.5
3.0
3.5
SUPPLY VOLTAGE (V)
3204 G08
Extra Input Current vs Load Current
(I_IN-2I_LOAD)
10
V_IN = 2.4V
LTC3204B-3.3
(NON-BURST MODE
OPERATION)
1
LTC3204-3.3
(BURST MODE
OPERATION)
0.1
0.01
0.01
0.1
1
10 100
LOAD CURRENT (mA)
1000
3204 G11
Effective Open-Loop Output
Resistance vs Temperature
9
V_IN = 1.8V
V_OUT = 3V
8
7
6
5
–50
0
50
100
TEMPERATURE (°C)
3204 G09
Efficiency vs Supply Voltage
100
90
80
THEORETICAL MAX
70
60 ^IOUT ^{= 30mA}
I_OUT = 1mA
50
40
30
20
10
0
1.8 2.0
2.2 2.4 2.6 2.8
SUPPLY VOLTAGE (V)
3.0 3.2
3204 G12
V_OUT Soft-Start Response
Output Ripple
Load Transient Response
V_OUT
2V/DIV
SHDN
2V/DIV
V_IN = 2.4V
I_LOAD = 50mA
500µs/DIV
V_OUT
20mV/DIV
(AC COUPLED)
3204 G³1²3^{04 G13}
V_IN = 2.4V
I_LOAD = 50mA
500ns/DIV
V_OUT
20mV/DIV
(AC COUPLED)
I_OUT ^50mA
30mA
3204 G³1²4^{04 G14}
V_IN = 2.4V
10µs/DIV
I_OUT = 30mA TO 50mA STEP
3204³²G⁰1⁴5 ^G15
3204fa
4