LTC3539-2_15 Datasheet, PDF (5/14 Pages) Linear Technology – 2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters

LTC3539/LTC3539-2
TYPICAL PERFORMANCE CHARACTERISTICS
R_DS(ON) vs V_OUT
0.30
0.25
0.20
PMOS
0.15
0.10
NMOS
0.05
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_OUT (V)
3539 G09
R_DS(ON) Change vs Temperature
1.3
1.2
1.1
1.0
0.9
0.8
0.7
–50 –30 –10 10 30 50
TEMPERATURE (°C)
70 90
3539 G10
V_FB vs Temperature
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3539 G11
Start-Up Voltage vs Temperature
0.80
0.75
1mA LOAD
0.70
0.65
NO LOAD
0.60
0.55
Fixed Frequency SW and I_L(AC)
Burst Mode SW and I_L(AC)
SW PIN
2V/DIV
V_OUT
20mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
500mA/DIV
500ns/DIV
V_IN = 2.4V
V_OUT = 3.3V AT 400mA
C_OUT = 22µF
3539 G13
SW PIN
5V/DIV
V_OUT
20mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
V_IN = 3.3V
V_OUT = 5V
C_OUT = 22µF
5µs/DIV
0.50
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
3539 G12
3539 G14
Load Step, Fixed Frequency
V_OUT
50mV/DIV
AC-COUPLED
LOAD
CURRENT
200mA/DIV
500µs/DIV
V_IN = 2.4V
V_OUT = 3.3V
C_OUT = 22µF
I_LOAD = 100mA TO 250mA STEP
3539 G15
Load Step, Burst Mode Operation
V_OUT
50mV/DIV
AC-COUPLED
LOAD
CURRENT
200mA/DIV
500µs/DIV
V_IN = 2.4V
V_OUT = 3.3V
C_OUT = 22µF
I_LOAD = 20mA TO 170mA
3539 G16
For more information www.linear.com/3539/3539-2
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