Datasheet

LTC3528/LTC3528B
5
3528fd
TEMPERATURE (°C)
–50 –25
600
START-UP VOLTAGE (mV)
700
850
0
50
75
3528 G17
650
800
750
25
100
125
V
OUT
(V)
1
10.5
CURRENT (µA)
11.5
12.5
13.5
2 3
3528 G18
4 5
V
IN
= 1.2V
Oscillator Frequency Change
vs V
OUT
R
DS(ON)
vs V
OUT
Oscillator Frequency Change
vs Temperature
R
DS(ON)
Change vs Temperature
V
FB
vs Temperature
Start-Up Voltage vs Temperature
Fixed Frequency V
OUT
Ripple and
Inductor Current Waveforms
Burst Mode Quiescent Current vs
V
OUT
(LTC3528)
V
IN
(V)
1
0
I
OUT
(mA)
20
40
60
2 3
3528 G11
4
V
OUT
= 5V
ENTER BURST
EXIT BURST
V
OUT
(V)
1.5
FREQUENCY CHANGE (%)
–1.50
0
0.25
0.50
2.5
3.5
4
3528 G12
–2.00
–0.50
–1.00
–1.75
–0.25
–2.25
–0.75
–1.25
2
3
4.5
5
NORMALIZED TO V
OUT
= 3V
V
OUT
(V)
1.5
300
350
450
3 4
3528 G13
250
200
2 2.5
3.5 4.5 5
150
100
400
R
DS(ON)
(mΩ)
PMOS
NMOS
TEMPERATURE (˚C)
–50
FREQUENCY CHANGE (%)
0
1
2
25 75
3528 G14
–1
–2
–25 0
50 100 125
–3
–4
TEMPERATURE (˚C)
–50
CHANGE (%)
20
30
40
25 75
3528 G15
10
0
–25 0
50 100 125
–10
–20
TEMPERATURE (°C)
–50
1.196
V
FB
(V)
1.197
1.198
1.199
1.200
–25 0 25 50
3528 G16
75 100 125
V
OUT
20mV/DIV
2µs/DIV
3528 G19
V
IN
= 1.2V
V
OUT
= 3.3V
C
OUT
= 22µF
C
FF
= 33pF
I
OUT
= 100mA
I
L
200mA/DIV
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
Burst Mode Threshold Current
vs V
IN