Datasheet

LTC3261
4
3261fb
For more information www.linear.com/3261
Typical perForMance characTerisTics
Oscillator Frequency
vs Supply Voltage
Effective Open-Loop Resistance
vs Temperature
Quiescent Current
vs Supply Voltage
(Constant Frequency Mode)
Quiescent Current vs Temperature
(Constant Frequency Mode)
Oscillator Frequency vs RT
V
OUT
Short-Circuit Current
vs Supply Voltage
V
OUT
Short Circuit Current
vs Temperature
Shutdown Current vs Temperature
Quiescent Current vs Temperature
(Burst Mode Operation)
(T
A
= 25°C, C
F LY
= 1µF, C
IN
= C
OUT
= 10µF unless otherwise noted)
SUPPLY VOLTAGE (V)
0
0
500
600
400
300
200
100
20 25 3010 155 35
3261 G01
RT = GND
RT = 200kΩ
OSCILLATOR FREQUENCY (kHz)
RT (kΩ)
1
0
500
600
400
300
200
100
100 100010 10000
3261 G02
OSCILLATOR FREQUENCY (kHz)
TEMPERATURE (°C)
–50
0
25
20
15
10
5
5025 100750–25 150125
3261 G03
SHUTDOWN CURRENT (µA)
V
IN
= 5V
V
IN
= 12V
V
IN
= 32V
TEMPERATURE (°C)
–50
0
140
100
120
60
80
40
20
5025 100750–25 150125
3261 G04
QUIESCENT CURRENT (µA)
RT = GND
V
IN
= 32V
V
IN
= 12V
V
IN
= 5V
SUPPLY VOLTAGE (V)
0
0
14
10
12
6
8
4
2
1510 25205 3530
3261 G05
QUIESCENT CURRENT (mA)
f
OSC
= 50kHz
f
OSC
= 200kHz
f
OSC
= 500kHz
TEMPERATURE (°C)
–50
0
9
7
8
5
6
4
3
2
1
50250 10075–25 150125
3261 G06
QUIESCENT CURRENT (mA)
f
OSC
= 50kHz
f
OSC
= 200kHz
f
OSC
= 500kHz
V
IN
= 12V
TEMPERATURE (°C)
–50
20
60
50
55
40
45
35
30
25
50250 10075–25 150125
3261 G07
EFFECTIVE OPEN LOOP RESISTANCE (Ω)
V
IN
= 12V
V
IN
= 25V
V
IN
= 32V
f
OSC
= 500kHz
SUPPLY VOLTAGE (V)
0
0
250
150
200
50
100
15105 2520 3530
3261 G08
V
OUT
SHORT CIRCUIT CURRENT (mA)
f
OSC
= 500kHz
f
OSC
= 200kHz
TEMPERATURE (°C)
–50
100
200
180
160
140
120
–25 0 25 50 12575 100
3261 G8b
V
OUT
SHORT CIRCUIT CURRENT (mA)
V
IN
= 12V
RT = GND