LTC3528_15 Datasheet, PDF (5/18 Pages) Linear Technology – 1A, 1MHz Synchronous Step-Up DC/DC Converters

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