LTC3261
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C, C
FLY
= 1μF C
IN
= C
OUT
= 10μF unless otherwise noted)
,
Voltage Loss (V
IN
– |V
OUT
|)
vs Output Current
(Constant Frequency Mode)
3.0
2.5
VOLTAGE LOSS (V)
2.0
1.5
1.0
0.5
0.0
0.1
f
OSC
= 50kHz
f
OSC
= 200kHz
f
OSC
= 500kHz
90
EFFECTIVE OPEN LOOP RESISTANCE (Ω)
V
IN
= 12V
80
70
60
50
40
30
20
10
0
1
10
OUTPUT CURRENT (mA)
100
3261 G09
Effective Open-Loop Resistance
vs Supply Voltage
V
OUT
500mV/DIV
AC-COUPLED
V
OUT
Load Transient Burst Mode
Operation (MODE = H)
f
OSC
= 200kHz
f
OSC
= 500kHz
–5mA
I
OUT
–50mA
V
IN
= 12V
f
OSC
= 500kHz
0
5
10
15
20
25
SUPPLY VOLTAGE (V)
30
35
2ms/DIV
3261 G11
3261 G10
V
OUT
Transient
(MODE = Low to High)
100
AVERAGE INPUT CURRENT (mA)
Average Input Current
vs Output Current
V
OUT
10mV/DIV
AC-COUPLED
V
OUT
Ripple
MODE = L
V
OUT
500mV/DIV
AC-COUPLED
10
MODE = L
MODE
MODE = H
1
V
OUT
200mV/DIV
AC-COUPLED
MODE = H
V
IN
= 12V
f
OSC
= 500kHz
I
OUT
= –5mA
2ms/DIV
3261 G12
V
IN
= 12V
f
OSC
= 500kHz
0.1
0.1
1
10
OUTPUT CURRENT (mA)
100
3261 G13
100μs/DIV
V
IN
= 15V
f
OSC
= 500kHz
I
OUT
= 5mA
3261 G14
3261f
5
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
