LTC3526L-2_15 Datasheet, PDF (5/16 Pages) Linear Technology – 550mA 2MHz Synchronous Step-Up DC/DC Converters

LTC3526L-2/LTC3526LB-2
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
V_FB vs Temperature
0.50
NORMALIZED TO 25°C
0.25
0
Start-Up Voltage vs Temperature
0.80
0.75
1mA LOAD
0.70
Burst Mode Quiesent Current
vs V_OUT (LTC3526L-2)
10.0
9.5
9.0
–0.25
–0.50
0.65
8.5
NO LOAD
0.60
8.0
–0.75
0.55
7.5
–1.00
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3526lb2 G13
0.50
–50 25 0 25 50 75 100
TEMPERATURE (°C)
3526lb2 G14
7.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V_OUT (V)
3526lb2 G15
Load Regulation
0.5
V_OUT = 1.8V
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01 0.1
1
10
LOAD (mA)
V_IN = 0.9V
V_IN = 1.2V
V_IN = 1.5V
100 1000
3526lb2 G23
Load Regulation
0.5
V_OUT = 3.3V
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01 0.1
1
10
LOAD (mA)
V_IN = 1.2V
V_IN = 1.8V
V_IN = 2.4V
100 1000
3526lb2 G24
Load Regulation
0.5
V_OUT = 5V
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01 0.1
1
10
LOAD (mA)
V_IN = 1.2V
V_IN = 2.4V
V_IN = 3.6V
V_IN = 4.2V
100 1000
3526lb2 G25
Fixed Frequency Switching
Waveform and V_OUT Ripple
Burst Mode Waveforms
(LTC3526L-2)
SW PIN
2V/DIV
V_OUT
20mV/DIV
AC-COUPLED
V_IN = 1.2V
200ns/DIV
V_OUT = 3.3V AT 100mA
C_OUT = 4.7µF
SW PIN
2V/DIV
V_OUT
20mV/DIV
AC-COUPLED
3526lb2 G16
V_IN = 1.2V
20µs/DIV
V_OUT = 3.3V AT 5mA
C_OUT = 10µF
V_OUT and I_IN During Soft-Start
V_OUT
1V/DIV
INPUT
CURRENT
0.2A/DIV
SHDN PIN
1V/DIV
3526lb2 G17
V_OUT = 3.3V
C_OUT = 4.7µF
200µs/DIV
3526lb2 G18
3526lb2fa