LTC3261
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C, C
FLY
= 1μF C
IN
= C
OUT
= 10μF unless otherwise noted)
,
Oscillator Frequency
vs Supply Voltage
600
OSCILLATOR FREQUENCY (kHz)
OSCILLATOR FREQUENCY (kHz)
500
400
300
200
100
0
0
5
10
15
20
25
SUPPLY VOLTAGE (V)
30
35
RT = 200kΩ
RT = GND
600
500
400
300
200
100
0
1
10
100
RT (kΩ)
1000
10000
3261 G02
Oscillator Frequency vs RT
25
Shutdown Current vs Temperature
V
IN
= 32V
V
IN
= 12V
V
IN
= 5V
SHUTDOWN CURRENT (μA)
20
15
10
5
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3261 G03
3261 G01
Quiescent Current vs Temperature
(Burst Mode Operation)
140
RT = GND
120
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (μA)
100
V
IN
= 32V
80
V
IN
= 12V
60
40
20
0
–50 –25
V
IN
= 5V
12
10
8
6
4
2
0
0
25 50 75 100 125 150
TEMPERATURE (°C)
3261 G04
Quiescent Current
vs Supply Voltage
(Constant Frequency Mode)
14
f
OSC
= 500kHz
f
OSC
= 200kHz
f
OSC
= 50kHz
9
8
QUIESCENT CURRENT (mA)
7
6
5
4
3
2
1
0
5
10
15
20
25
SUPPLY VOLTAGE (V)
30
35
Quiescent Current vs Temperature
(Constant Frequency Mode)
V
IN
= 12V
f
OSC
= 500kHz
f
OSC
= 200kHz
f
OSC
= 50kHz
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3261 G06
3261 G05
Effective Open-Loop Resistance
vs Temperature
60
EFFECTIVE OPEN LOOP RESISTANCE (Ω)
V
OUT
SHORT CIRCUIT CURRENT (mA)
55
50
45
40
35
30
25
20
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3261 G07
V
OUT
Short-Circuit Current
vs Supply Voltage
250
V
OUT
SHORT CIRCUIT CURRENT (mA)
200
V
OUT
Short Circuit Current
vs Temperature
V
IN
= 12V
RT = GND
180
V
IN
= 32V
V
IN
= 25V
V
IN
= 12V
f
OSC
= 500kHz
200
f
OSC
= 500kHz
150
160
100
f
OSC
= 200kHz
140
50
120
0
0
5
10
15
20
25
SUPPLY VOLTAGE (V)
30
35
100
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
3261 G08
3261 G8b
3261f
4
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
