Datasheet

LTC3459
4
3459fc
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum R
OUT
vs V
IN
Maximum P
OUT
vs V
IN
V
IN
and V
OUT
Quiescent Current
vs Temperature
Switching Frequency
vs V
IN
at Various V
OUTs
V
OUT
Regulation vs V
IN
and C
OUT
N-Channel and P-Channel
MOSFET R
DS(ON)
vs Temperature
Shutdown Threshold Voltage
vs Temperature Burst Cycle Switch Pin Waveform
(T
A
= 25°C, unless otherwise noted).
V
IN
(V)
1.5
R
OUT
(Ω)
3500
3
3459 G01
2000
1000
2 2.5 3.5
500
0
4000
3000
2500
1500
4 4.5 5.55
V
OUT
= 10V
V
OUT
= 7.5V
V
OUT
= 5V
V
OUT
= 3.3V
L = 22μH
V
IN
(V)
1.5
200
250
400
350
34
3459 G02
150
100
2 2.5
3.5 4.5 5.55
50
0
300
P
OUT
(mW)
V
OUT
= 10V
V
OUT
= 7.5V
V
OUT
= 5V
V
OUT
= 3.3V
L = 22μH
TEMPERATURE (°C)
–40
CURRENT (μA)
14
20
3459 G03
8
4
–20 0 40
2
0
16
V
IN
= 3.3V
V
OUT
= 5V
I
IN
I
OUT
12
10
6
60 80
V
IN
(V)
1.5
FREQUENCY (MHz)
2.0
2.5
3.0
3 4 5.5
3459 G04
1.5
1.0
0.5
2 2.5
3.5
4.5 5
V
OUT
= 10V
V
OUT
= 7.5V
V
OUT
= 5V
V
OUT
= 3.3V
L = 22μH
V
IN
(V)
1.5
% CHANGE IN V
OUT
0
1.0
5.5
3459 G05
–1.0
–2.0
2.5
3.5
4.5
2
3
4
5
2.0
–0.5
0.5
–1.5
1.5
4.7μF
10μF
22μF
47μF
V
OUT
= 5V
L = 22μH
TEMPERATURE (°C)
–40
R
DS(ON)
(Ω)
4
5
6
20 60
3459 G06
3
2
–20 0
40
NCH
PCH
80
1
0
V
OUT
= 5V
TEMPERATURE (°C)
–40
SHUTDOWN THRESHOLD VOLTAGE (V)
0.8
1.0
1.2
20 60
3459 G07
0.6
0.4
–20 0
40 80
0.2
0
SHDN FALLING
SHDN RISING
SW
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
V
IN
= 3.3V
V
OUT
= 5V
L = 22μH
1μs/DIV
3459 G08
SW
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
V
IN
= 3.3V
V
OUT
= 5V
L = 22μH
100ns/DIV
3459 G09