LTC3260_15 Datasheet, PDF (6/18 Pages) Linear Technology – Low Noise Dual Supply Inverting Charge Pump

LTC3260
Typical Performance Characteristics
(T_A = 25°C, C_FLY = 1µF, C_IN = C_OUT = C_LDO+ = C_LDO– = 10µF unless otherwise noted)
ADJ^– Pin Voltage vs Temperature
LDO^– Dropout Voltage
vs Temperature
–1.176
400
350
IV_LODUOT–
=
=
–12V
50mA
–1.188
300
250
–1.200
200
150
–1.212
100
50
–1.224
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3260 G16
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3260 G17
LDO^– Power Supply Rejection
60
50
40
30
20
10
IVV_{LOLDDUOOT––}^{===–––655.05VmV} A
0
VC_{RLDIPOP–LE=}
= 50mV_RMS
10µF
0.1
1
10
100
FREQUENCY (kHz)
1000
3260 G18
LDO^– Load Regulation
–1.1994
–1.1996
V_OUT = –12V
UNITY GAIN
–1.1998
–1.2000
–1.2002
–1.2004
–1.2006
0.1
1
10
I_LDO– (mA)
LDO^– Load Transient
LDO Rejection of V_OUT Ripple
LDO⁺ Load Transient
V_LDO+
10mV/DIV
AC-COUPLED
V_LDO–
10mV/DIV
AC-COUPLED
V_OUT
10mV/DIV
AC-COUPLED
V_LDO+
10mV/DIV
AC-COUPLED
I_LDO+
20mA
2mA
100
3260 G19
VVV^{ILLNDDOO=+–1==5V1–21V2V}
f_OSC = 500kHz
II^{LLDDOO+–}
= 50mA
–50mA
1µs/DIV
3260 G20
VV_ILNDO=₊1=2V5V
40µs/DIV
V_OUT Transient (Burst Mode
Operation, MODE = H)
V_OUT Transient
(MODE = Low to High)
3260 G21
V_LDO–
10mV/DIV
AC-COUPLED
V_OUT
500mV/DIV
AC-COUPLED
V_OUT
500mV/DIV
AC-COUPLED
I_{LDO–––220mmAA}
VV_ILNDO=_–1=2V–5V
40µs/DIV
REFER TO FIGURE 3
I_{OUT–––550mmAA}
3260 G22
V_IN = 12V
f_OSC = 500kHz
2ms/DIV
MODE
3260 G23
V_IN = 12V
f_OSC = 500kHz
I_OUT = –5mA
2ms/DIV
3260 G24
3260fa
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