LTC3260_15 Datasheet, PDF (5/18 Pages) Linear Technology – Low Noise Dual Supply Inverting Charge Pump

Typical Performance Characteristics
(T_A = 25°C, C_FLY = 1µF, C_IN = C_OUT = C_LDO+ = C_LDO– = 10µF unless otherwise noted)
Effective Open-Loop Resistance
vs Temperature
60
f_OSC = 500kHz
50
40
30
20
10
0
–50 –25
V_IN = 32V
V_IN = 25V
V_IN = 12V
0 25 50 75 100 125 150
TEMPERATURE (°C)
3620 G07
Effective Open-Loop Resistance
vs Supply Voltage
90
80
70
f_OSC = 200kHz
60
50
f_OSC = 500kHz
40
30
20
10
0
0 5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
3260 G10
V_OUT Short-Circuit Current
vs Supply Voltage
250
200
R_T = GND
150
100
R_T = 200kΩ
50
0
0 5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
3260 G08
ADJ⁺ Pin Voltage vs Temperature
1.224
1.212
1.200
1.188
1.176
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3260 G11
LTC3260
Voltage Loss (V_IN – |V_OUT|)
vs Output Current (Constant
Frequency Mode)
3.0
V_IN = 12V
2.5
f_OSC = 200kHz
2.0
f_OSC = 50kHz
1.5
1.0
0.5
0
0.1
1
f_OSC = 500kHz
10
100
OUTPUT CURRENT (mA)
3260 G09
LDO⁺ Dropout Voltage
vs Temperature
800
700
VI_LIDNO=₊
12V
= 50mA
600
500
400
300
200
100
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3260 G12
LDO⁺ Supply Rejection
60
50
40
30
20
10
IVV_LILDNDOO^{=++6==.555V0VmA}
VC_RLDIPOP+LE=
= 50mV_RMS
10µF
0
0.1
1
10
100
FREQUENCY (kHz)
1000
3260 G13
LDO⁺ GND Pin Current vs I_LOAD
0.14
V_IN = 12V
0.12
0.10
0.08
0.06
0.04
0.02
0
0
1
10
100
I_LOAD (mA)
3260 G14
LDO⁺ Load Regulation
1.2006
1.2004
V_IN = 12V
UNITY GAIN
1.2002
1.2000
1.1998
1.1996
1.1994
0.1
1
10
I_LDO+ (mA)
100
3260 G15
3260fa
5