LTC3535_15 Datasheet, PDF (5/16 Pages) Linear Technology – Dual Channel 550mA 1MHz Synchronous Step-Up DC/DC Converter

LTC3535
TYPICAL PERFORMANCE CHARACTERISTICS (Each Channel) T_A = 25°C, unless otherwise noted.
R_DS(ON) vs V_OUT
0.90
0.85
0.80
0.75
0.70
0.65
PMOS
0.60
0.55
0.50
0.45
0.40
NMOS
0.35
0.30
1.5 2.0 2.5 3.0 3.5 4.0
V_OUT (V)
4.5 5.0
3535 G10
V_FB vs Temperature
0.50
NORMALIZED TO 25°C
0.25
0
–0.25
–0.50
–0.75
–1.00
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3535 G13
Fixed Frequency Switching
Waveform and V_OUT Ripple
Oscillator Frequency Change
vs Temperature
10
NORMALIZED TO 25°C
8
6
4
2
0
–2
–4
–6
–8
–10
–50 –30 –10 10 30 50 70 90
TEMPERATURE (°C)
3535 G11
Start-Up Voltage vs Temperature
0.80
0.75
1mA LOAD
0.70
0.65
NO LOAD
0.60
0.55
0.50
–50 25 0 25 50 75 100
TEMPERATURE (°C)
3526 G14
R_DS(ON) Change vs Temperature
1.3
NORMALIZED TO 25°C
1.2
1.1
1.0
0.9
0.8
0.7
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
3535 G12
Burst Mode Quiescent Current
vs V_OUT
10.0
MEASURED ON V_OUT
9.5
9.0
8.5
8.0
7.5
7.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V_OUT (V)
3535 G15
Burst Mode Waveforms
V_OUT and I_IN During Soft-Start
SW PIN
2V/DIV
V_OUT
10mV/DIV
AC-COUPLED
V_IN = 1.2V
500ns/DIV
V_OUT = 3.3V AT 100mA
C_OUT = 10µF
SW PIN
2V/DIV
V_OUT
20mV/DIV
AC-COUPLED
3535 G16
INDUCTOR
CURRENT
0.2A/DIV
V_IN = 1.2V
V_OUT = 3.3V
C_OUT = 10µF
10µs/DIV
V_OUT
1V/DIV
3535 G17
INPUT
CURRENT
0.2A/DIV
SHDN PIN
1V/DIV
V_OUT = 3.3V
C_OUT = 10µF
200µs/DIV
3535 G18
3535fa
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