LTC3526-2_15 Datasheet, PDF (5/16 Pages) Linear Technology – 500mA 2MHz Synchronous Step-Up DC/DC Converters

LTC3526-2/LTC3526B-2
Typical Performance Characteristics
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 80 100
TEMPERATURE (°C)
35262b2 G13
Fixed Frequency Switching
Waveform and V_OUT Ripple
Start-Up Voltage vs Temperature
1.00
LOAD = 1mA
0.95
0.90
0.85
0.80
0.75
0.70
–50 –30 –10 10 30 –50
TEMPERATURE (°C)
70 90
35262b2 G14
Burst Mode Waveforms
Burst Mode Quiescent Current
vs V_OUT
10.0
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)
35262b2 G15
V_OUT and I_IN During Soft-Start
SW PIN
2V/DIV
V_OUT
10mV/DIV
AC-COUPLED
V_IN = 1.2V
200ns/DIV
V_OUT = 3.3V AT 50mA
C_OUT = 4.7µF
SW PIN
2V/DIV
35262b2 G16
V_OUT
50mV/DIV
AC-COUPLED
V_IN = 1.2V
20µs/DIV
V_OUT = 3.3V AT 5mA
C_OUT = 10µF
V_OUT
1V/DIV
35262b2 G17
INPUT
CURRENT
0.2A/DIV
SHDN PIN
1V/DIV
V_OUT = 3.3V
C_OUT = 10µF
200µs/DIV
35262b2 G18
Load Step Response (from Burst
Mode Operation)
V_OUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
V_IN = 3.6V
100µs/DIV
V_OUT = 5V
20mA TO 170mA STEP
C_OUT = 10µF
35262b2 G19
Load Step Response
(Fixed Frequency)
V_OUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
V_IN = 3.6V
100µs/DIV
V_OUT = 5V
50mA TO 150mA STEP
C_OUT = 10µF
35262b2 G20
35262b2fc