LTC3527-1_15 Datasheet, PDF (6/22 Pages) Linear Technology – Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

LTC3527/LTC3527-1
TYPICAL PERFORMANCE CHARACTERISTICS (T_A = 25°C, unless otherwise noted)
Current Limit vs Temperature
1.30
CONVERTER1
1.20
1.10
V_IN = 1.2V
1.00 _{VOUT = 3.3V}
0.90
0.80
0.70
CONVERTER2
0.60
0.50
–45 –30 –15 0 15 30 45 60
TEMPERATURE (°C)
75 90
35271 G17
Feedback Voltage vs Temperature
1.205
1.200
1.195
1.190
1.185
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
35271 G18
Start-Up Voltage vs Temperature
0.75
0.70
0.65
0.60
0.55
0.50
0.45
–50 –30 –10 10 30 50 70 90
TEMPERATURE (°C)
35271 G19
Burst Mode Quiescent Current
vs V_OUT
16
V_IN = 1.2V
15
14
13
12
11
10
1.5 2 2.5 3 3.5 4 4.5 5
V_OUT (V)
35271 G20
R_DS(ON) (NMOS and PMOS)
vs V_OUT
0.90
PMOS2
0.80
0.70
NMOS2
0.60
0.50
NMOS1
0.40
PMOS1
0.30
1.5 2 2.5 3 3.5 4 4.5 5
V_OUT (V)
35271 G21
R_DS(ON) (NMOS and PMOS)
Change vs Temperature
0.70
PMOS2
0.60
NMOS2
0.50
PMOS1
0.40
NMOS1
0.30
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
35271 G22
Fixed Frequency Switching
Waveform and V_OUT Ripple
Burst Mode Waveforms
SW1 PIN
2V/DIV
V_OUT1
10mV/DIV
AC-COUPLED
500μs/DIV
V_IN1 = 1.2V
V_OUT1 = 3.3V AT 100mA
C_OUT1 = 10μF
35271 G23
SW1 PIN
2V/DIV
V_OUT1
50mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
V_IN1 = 1.2V
V_OUT1 = 3.3V
C_OUT1 = 10μF
10μs/DIV
35271 G24
35271fc
6