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LTC3527-1_15 Datasheet, PDF (7/22 Pages) Linear Technology – Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters
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LTC3527/LTC3527-1
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted)
VOUT and IIN During Start-Up
VOUT1
1V/DIV
INPUT
CURRENT
200mA/DIV
SHDN1 PIN
1V/DIV
VOUT1 = 3.3V
COUT1 = 10μF
100μs/DIV
35271 G25
VOUT1 Load Step Response
Burst Mode Operation at 1.2MHz
VOUT1
100mV/DIV
AC-COUPLED
VOUT1 Load Step Response
Fixed Frequency at 1.2MHz
VOUT1
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
100μs/DIV
VIN = 3.6V 50mA TO 150mA STEP
VOUT1 = 5V COUT1 = 10μF
35271 G26
VOUT2 Load Step Response
Fixed Frequency at 2.2MHz
VOUT2
100mV/DIV
AC-COUPLED
LOAD
CURRENT
50mA/DIV
100μs/DIV
VIN = 3.6V 20mA TO 170mA STEP
VOUT1 = 5V COUT1 = 10μF
35271 G27
VOUT1 = 5V Load Regulation
0.3
VIN = 2.4V
L = 3.3µH
0.2 MODE = HIGH
0.1
0
–0.1
–0.2
–0.3.
0
50 100 150 200 250 300 350 400
ILOAD1 (mA)
35271 G29
LOAD
CURRENT
50mA/DIV
100μs/DIV
VIN = 3.6V 50mA TO 100mA STEP
VOUT2 = 5V COUT2 = 10μF
35271 G28
VOUT2 = 3.3V Load Regulation
0.3
VIN = 2.4V
L = 3.3µH
0.2 MODE = HIGH
0.1
0
–0.1
–0.2
–0.3.
0
100
200
ILOAD2 (mA)
300
35271 G30
35271fc
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