LTC3260
(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
EFFECTIVE OPEN-LOOP RESISTANCE ( )
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
TYPICAL PERFORMANCE CHARACTERISTICS
+
–
V
OUT
Short-Circuit Current
vs Supply Voltage
250
V
OUT
SHORT-CIRCUIT CURRENT (mA)
Voltage Loss (V
IN
– |V
OUT
|)
vs Output Current (Constant
Frequency Mode)
3.0
2.5
VOLTAGE LOSS (V)
2.0
f
OSC
= 50kHz
1.5
1.0
0.5
0
f
OSC
= 500kHz
0.1
1
10
OUTPUT CURRENT (mA)
100
3260 G09
f
OSC
= 500kHz
V
IN
= 12V
f
OSC
= 200kHz
200
R
T
= GND
150
100
R
T
= 200k
50
0
0
5
20
10
25
15
SUPPLY VOLTAGE (V)
30
35
3260 G08
Effective Open-Loop Resistance
vs Supply Voltage
90
EFFECTIVE OPEN-LOOP RESISTANCE ( )
80
ADJ
+
PIN VOLTAGE (V)
70
60
50
40
30
20
10
0
0
5
10
15
20
25
SUPPLY VOLTAGE (V)
30
35
f
OSC
= 500kHz
f
OSC
= 200kHz
1.224
ADJ
+
Pin Voltage vs Temperature
800
LDO
+
DROPOUT VOLTAGE (mV)
700
600
500
400
300
200
100
1.176
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3260 G11
LDO
+
Dropout Voltage
vs Temperature
V
IN
= 12V
I
LDO+
= 50mA
1.212
1.200
1.188
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3260 G12
3260 G10
LDO
+
Supply Rejection
60
50
GND PIN CURRENT (mA)
40
30
20
10
V
IN
= 6.5V
V
LDO+
= 5V
I
LDO+
= 50mA
V
RIPPLE
= 50mV
RMS
C
LDO+
= 10µF
1
10
100
FREQUENCY (kHz)
1000
3260 G13
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
LDO
+
GND Pin Current vs I
LOAD
V
IN
= 12V
1.2006
1.2004
1.2002
V
LDO+
(V)
1.2000
1.1998
1.1996
1.1994
LDO
+
Load Regulation
V
IN
= 12V
UNITY GAIN
LDO
+
SUPPLY REJECTION (dB)
0
0.1
0
1
I
LOAD
(mA)
10
100
3260 G14
0.1
1
I
LDO+
(mA)
10
100
3260 G15
3260f
5
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
