Datasheet

LTC3261
5
3261fb
For more information www.linear.com/3261
Typical perForMance characTerisTics
Voltage Loss (V
IN
– |V
OUT
|)
vs Output Current
(Constant Frequency Mode)
(T
A
= 25°C, C
F LY
= 1µF, C
IN
= C
OUT
= 10µF unless otherwise noted)
Effective Open-Loop Resistance
vs Supply Voltage
Average Input Current
vs Output Current
V
OUT
Load Transient Burst Mode
Operation (MODE = H)
V
OUT
Ripple
V
OUT
Transient
(MODE = Low to High)
OUTPUT CURRENT (mA)
0.1
0.0
3.0
2.0
2.5
1.0
0.5
1.5
1 10010
3261 G09
VOLTAGE LOSS (V)
f
OSC
= 500kHz
f
OSC
= 200kHz
f
OSC
= 50kHz
V
IN
= 12V
SUPPLY VOLTAGE (V)
0
0
90
70
80
50
40
30
20
10
60
5 10 15 20 3525 30
3261 G10
EFFECTIVE OPEN LOOP RESISTANCE (Ω)
f
OSC
= 200kHz
f
OSC
= 500kHz
V
OUT
500mV/DIV
AC-COUPLED
2ms/DIV
3261 G11
V
IN
= 12V
f
OSC
= 500kHz
–5mA
I
OUT
–50mA
V
OUT
500mV/DIV
AC-COUPLED
2ms/DIV
3261 G12
V
IN
= 12V
f
OSC
= 500kHz
I
OUT
= –5mA
MODE
OUTPUT CURRENT (mA)
0.1
0.1
100
10
1
1 10010
3261 G13
AVERAGE INPUT CURRENT (mA)
MODE = L
MODE = H
V
IN
= 12V
f
OSC
= 500kHz
100µs/DIV
V
OUT
10mV/DIV
AC-COUPLED
V
OUT
200mV/DIV
AC-COUPLED
3261 G14
V
IN
= 15V
f
OSC
= 500kHz
I
OUT
= 5mA
MODE = L
MODE = H